HomeMy WebLinkAboutPermit PL15-0027 - THOMAS BANNISTER - GREEN RIVER BANK REPAIR CHECKLISTSEPA
CHECKLIST
Parent Project:
PL15-0027
ISSUED DNS
This File:
E15-0007
r
City of Tukwila Jim Haggerton, Mayor
Department of Community Development Jack Pace, Director
DETERMINATION OF NON -SIGNIFICANCE (DNS)
File Number: E15-0007
Applied: June 24, 2015
Issue Date: August 17, 2015
Applicant: Thomas Bannister, GeoEngineers
Lead Agency: City of Tukwila
Description of Proposal: The current proposal is to install a subsurface drainage system and restore an eroded
bank on the west bank of the Green River at 14900 Interurban Ave. South.
Address:
Parcel Number:
14900 Interurban Ave. South, Tukwila, WA
3597000006
This notice is to confirm the decision reached by Tukwila's SEPA Official to issue a Determination of Non -
significance (DNS) for the above project based on the environmental checklist and the underlying permit
application.
The City has determined that the proposal does not have a probable significant adverse impact on the environment.
An environmental impact statement (EIS) is not required under RCW 43.21c.030(2) (c). This decision was made
after review of a completed environmental checklist and other information on file with the lead agency.
This information is available to the public on request. Project materials including the application, any staff reports,
and other studies related to the permits are available Monday through Friday 8:30 a.m. - 5:00 p.m. for inspection at
Tukwila Department of Community Development 6300 Southcenter Blvd., Suite 100, Tukwila, WA 98188.
The project planner is Valerie Lonneman, who may be contacted at (206) 433-7140 for further information.
This DNS is issued under WAC 197-11-340(2). Comments must be submitted by August 31, 2015. The lead
agency will not act on this proposal for 14 days from the date below.
a`/Jack Pace, Responsible Official Date
City of Tukwila
6300 Southcenter Blvd.
Tukwila, WA 98188
(206) 431-3670
The decision is appealable to the Superior Court pursuant to the Judicial Review of Land Use Decisions, Revised
Code of Washington (RCW 36.70C). Any appeal shall be linked to a specific governmental action. The State
Environmental Policy Act is not intended to create a cause of action unrelated to a specific governmental action.
Appeals of environmental determinations shall be commenced within the time period to appeal the governmental
action that is subject to environmental review. (RCW 43.21C.075)
Cc: Thomas Bannister, GeoEngineers
Kurn Schneider, Owner
Karen Walter, Muckleshoot Tribe
Washington Department of Fish and Wildlife
State Department of Ecology, SEPA Division
King County Assessor
6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone 206-431-3670 • Fax 206-431-3665
/- \
City of Tukwila
Jinz Haggerton, Mayor
Department of Community Development Jack Pace, Director
FINAL STAFF EVALUATION
FOR ENVIRONMENTAL CHECKLIST
File No: E15-0007
I. SUMMARY OF PROPOSED ACTION
The current proposal is to install a subsurface drainage system and restore an eroded bank on the west
bank of the Green River at 14900 Interurban Ave. South (APN#3597000006).
II. GENERAL INFORMATION
Project Name: Green River Bank Erosion Repair
Applicant: Thomas Bannister, GeoEngineers
Location: 14900 Interurban Ave. South, Tukwila, WA
Zoning: Regional Commercial Mixed Use (RCM)
Comprehensive
Plan Designation: RCM
The following information was considered as part of review of this application.
1. ESA Screening Checklist and SEPA Checklist dated May 18, 2015, revised July 31, 2015.
2. Site Plan, Cross -Section and Drain Details, Details, prepared by GeoEngineers.
3. Revised Analysis and Design Report dated July 30, 2015, prepared by GeoEngineers.
NOTE: Technical reports and attachments referenced above may not be attached to all copies of this
decision. Copies of exhibits, reports, attachments, or other documents maybe reviewed and/or obtained by
contacting Valerie Lonneman, Assistant Planner, 6300 Southcenter Boulevard, Tukwila, Washington,
98188, by phone at 206-433-7140.
6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone 206-431-3670 • Fax: 206-431-3665
III. BACKGROUND/PROPOSAL
The proposed project is to install a subsurface drainage system and restore an eroded bank on the
west bank of the Green River at 14900 Interurban Ave. South (APN#3597000006). The parcel is
generally flat and not leveed. The project will receive Shoreline Substantial Development permit
and SEPA (State Environmental Policy Act) determinations.
The entire project site is within the 200 foot shoreline jurisdiction of the Green River and the work
will be performed entirely within the 100 foot river buffer. Work will not occur water ward of the
Ordinary High Water Mark (OHWM) as no evidence of toe erosion nor scour have been found on
site.
The project design statement sates that the proposed work will mitigate for the ongoing bank
sloughing and address potential future drawdown failures, which are believed to be the primary
cause of bank sloughing at that location. A detailed description of the riverbank drainage system
from the Revised Analysis and Design Report states "the project consists of installing a subsurface
gravity drainage system to transport water away from the failure plane and rebuilding the riverbank
using a combination of structural fill and native soil."
IV. REVIEW OF THE ENVIRONMENTAL CHECKLIST
The following lists the elements contained within the Environmental Checklist submitted for the
proposed project. The numbers in the staff evaluation correspond to the numbers in the
Environmental Checklist. If staff concurs with the applicant's response, this is so stated. If the
response to a particular item in the checklist is found to be inadequate or clarification is needed,
there is additional staff comment and evaluation.
A. BACKGROUND:
1-4—Concur with checklist.
5—The construction will follow issuance of SEPA determination and after obtaining all required
permits from the City of Tukwila or other agencies.
6-10—Concur with checklist.
11—Parcel APN#3597000006
12—The project site lies within the Urban Conservancy Shoreline Environment Designation (no
levee) area and is completely contained within the 100' buffer but landward of the OHWM. The
project is also within the FEMA 100 year floodway. The site contains areas sloping between 15%
and 40% and underlain by permeable soils and engineered fill.
VL Page 2 of 5 08/17/2015
W:\Users\Valerie\SEPA\E15-0007 Staff Report
B. ENVIRONMENTAL ELEMENTS:
1. Earth:
a—h—Concur with checklist.
2. Air:
a-c—Concur with checklist.
3. Water:
a(1)—(6)—Concur with checklist.
b(1) and (2)—Concur with checklist.
c(1)—The project shall meet all King County Surface Water Design Manual drainage
requirements. All impacts associated to drainage will be mitigated as part of the
construction permit.
c(2)— Surface water design and construction shall be per the King County Surface Water
Design Manual as adopted by the City of Tukwila. All impacts associated with drainage
will be mitigated as part of the construction permit. Best Management Practices must be
followed to ensure that no construction debris enters river. All impacts related to
construction debris will be mitigated as part of the construction permit.
d—Concur with checklist.
4. Plants:
a—d—Concur with checklist.
5. Animals:
a-d—Concur with checklist.
6. Energy and Natural Resources:
a-c—Concur with checklist.
7. Environmental Health:
a —Concur with checklist.
a(1)-(2)—Concur with checklist.
b(1)—Concur with checklist.
b(2)-(3)—The project shall be subject to the City's noise ordinance and any construction
related noise shall be subject the city's noise ordinance. Compliance with applicable local,
state and federal noise regulations will mitigate any potential adverse noise impacts,
associated with the project.
8. Land and Shoreline Use:
a —The area of the proposed work is undeveloped and adjacent to a parking lot, with a
portion of the Green River Trail running through it.
VL Page 3 of 5 08/17/2015
W:\Users\Valerie\SEPA\E15-0007 Staff Report
b-f—Concur with checklist.
g—Concur with checklist. The site is in an un-leveed portion of the river.
h— Concur with checklist. The project is also within the FEMA 100 year floodway. The
site contains areas sloping between 15% and 40% and underlain by permeable soils and
engineered fill.
i-1—Concur with checklist.
9. Housing:
a-c—Concur with checklist.
10. Aesthetics:
a-c—Concur with checklist.
11. Light and Glare:
a-d—Concur with checklist.
12. Recreation:
a —Concur with checklist.
b—The project is within an area where Muckleshoot tribal members exercise their treaty
fishing rights. Currently there is no access to the river within the project area. However, the
project area is located approximately 150 feet north of an existing trail that is used by tribal
member to access the river for fishing. This trail will remain open during construction,
parking will be available, and access to the river via the trail will be unimpeded.
c—Concur with checklist.
13. Historic and Cultural Preservation:
a-b—Concur with checklist.
c—Applicant will comply with all local, state, and federal laws in the case that
archaeological or paleontological artifacts are encountered.
14. Transportation:
a-g—Concur with checklist.
15. Public Services:
a-b--Concur with checklist.
16. Utilities:
a-b—Concur with checklist.
IV. PUBLIC COMMENTS
Notice was sent to property owners and tenants within 500' of the site and agencies with
jurisdiction. No comments were received from the general public regarding the proposed work.
VL Page 4 of 5 08/17/2015
W:\Users\Valerie\SEPA\E15-0007 Staff Report
•
\ f \
Comments were received from the Muckleshoot Indian Tribe, stating that the project site is an area
where Muckleshoot tribal members exercise their treaty fishing rights and that the project must
therefore ensure that Tribe members will continue to have access to the Green River during
construction. Comments also noted that an increase in fishing in that area is a likely outcome of the
project work, as the project may create better river access. The Muckleshoot Tribe also requested to
be sent the as -built drawings and any monitoring reports generated by the project for their files.
These comments were forwarded to the applicant, who replied by stating that the area of proposed
work does not currently provide access to the river, but is located 150' north of the trail that is used
by tribal members for fishing. They confirmed that the work will not impede access to this area.
VI. CONCLUSION
The proposal can be found to not have a probable significant adverse impact on the environment
and pursuant to WAC 197-11-340, a Determination of Nonsignificance (DNS) is issued for this
project.
This DNS is based on impacts identified within the environmental checklist, attachments, and the
above "Final Staff Evaluation for Application No. E15-0007", and is supported by plans, policies,
and regulations formally adopted by city of Tukwila for the exercise of substantive authority under
SEPA to approve, condition, or deny proposed actions.
Prepared by: Valerie Lonneman, Assistant Planner
Date: August 17, 2015
VL Page 5 of 5 08/17/2015
W:\Users\Valerie\SEPA\E15-0007 Staff Report
RECEIVE
AUG 07. 2015
-I uKWILA
PUBLIC \WORKS
City of Tukwila
Department of Community Development
FILE NUMBER
L15-0032
E15-0007
Land Use Routing form for Revisions
TO: ❑ Building ❑ Fire Dept.
Public Works: (please list the name)
['Police Dept nParks/Rec.
Dad, ✓2 N�c �1,�c�•�
Project: Green River Bank Erosion Repair
Address: 14900 Interurban Ave S.
Date transmitted: 8/7/2015
Response requested by: 8/21/15
Planner: Valerie Lonneman
Date response received:
COMMENTS
Responses from architect, civil engineer, and landscape architect included in revision.
cov,e_ci,-;, .4:fr--1,
s i4, 0,,, 0,0 6 & i s -a o 3 2
— P
Z. t G
, 2k, s
I'l,4 s
SOY] F (.5 -boo? —
P u 6 Li .
U A_C
l-4,9s
/•( D
r►,
.rrs -
❑ DRC review requested ❑ Plan submittal requested ❑ Plan approved
Plan check date: SA g/ i s
Comments prepared by:(
City of Tukwila
REVISION SUBMITTAL
Department of Community Development
PLANNING DIVISION
6300 Southcenter Boulevard, Suite #100
Tukwila, Washington 98188
Phone: 206-431-3670
H +' a N •
AUG062015
Community
peVeiopment
Revision submittals must be submitted in person at the Permit Center,
ACCOMPANIED BY RESPONSE DOCUMENTS AND THIS COMPLETED FORM.
Revisions will not be accepted through the mail, email, fax, etc.
TUK
M
RECE Er,
AUG O7.2015
WIL.
PUBLIC WORKS
Date: 8/6/2015 Permit Number: L15-0032 & E15-0007
Project Name: Green River Bank Erosion Repair
Project Address: 14900 Interurban Ave S.
Project Contact: Thomas Bannister Contact Phone number: (206) 728-2674
City Planner: Valerie Lonneman
PLEASE ATTACH A COPY OF ANY LETTER REQUESTING CORRECTIONS / ADDITIONAL INFORMATION
❑ Response to Preliminary Approval
® Response to letter requesting additional information (Please attach a copy of the letter)
❑ Final Short Plat Submittal
Summary of revision/response submittal:
The applicant is providing a response memorandum to address comments received from the City of Tukwila in
Correction Letter #1. The project design report and SEPA checklist have been revised and resubmitted based on the
comments from the City.
Received at the City of Tukwila Permit(Center by:
entered in TRAKiT on
C:\Users\breinke\AppData\Local\Microsoft\Windows\lNetCache\Content.Outlook\81R3103M\L15-0032 Revision Submittal Form.doc
Revised: March 2014
City of Tukwila . Jim Haggerton, Mayor
Department of Community Development Jack Pace, Director
July 14, 2015
GeoEngineers, Inc.
Attn: Thomas Banister
600 Stewart Street, Suite 1700
Seattle, WA 98101
tbannister@geoengineers.com
Subject: Correction Letter #1
Green River Bank Erosion Repair
L15-0032, E15-0007
Dear Mr. Banister:
The City is in the process of reviewing your applications for Shoreline Substantial Development and SEPA
permits to install a subsurface drainage system and restore an eroded bank on the Green River located at
14900 Interurban Ave. South. Please address the following comments and resubmit relevant documents.
Departmental comments are listed below along with reviewer contact information:
Public Works —Dave McPherson (206) 431-2448:
SEPA — E15-0007
The Environmental Checklist should be revised as follows:
B. Environmental Elements
5. Animals
c. Yes — This area is part of the Pacific Flyway. A primary corridor for migratory bird species.
SHORELINE — L15-0032
Ref. GeoEngineers Report dated June 18, 2015 -
Pgl, Site Description - The river is tidally influenced at this point at the uppermost point. Revise the
document: Yes — work is at approximately river mile 11.4 and the title influence from recent Green River
studies extends as far as river mile 12. USGS considers 200th Street in Kent (river mile 17) to be the
spatial extent of the tidal influence.
Page 5 of GeoEngineers Report 1st paragraph states "To accommodate this slope angle, the existing asphalt
trail at the top of the bank may need to be realigned". Will the trail be replaced and will it have the same
alignment?
W:\Users\Valerie\SEPA\E15-0007 Green River Bank RepairfCorrection Letter #1
Page 1 of 2 6/24/2015
4
Thomas Banister
Green River Bank Erosion Repair
L15-0032/E15-0007
Building —Allen Johannessen (206) 433-7163:
No comments at this time.
Fire —Don Tomaso (206) 971-8723:
No comments at this time.
Planning —Valerie Lonneman (206) 433-7140:
SEPA — E15-0007
• Pg3e — Provide answer
• Pg4g — Discuss trail in impermeable section
• Pg4h — Provide details of erosion control and contingencies
• Pg4c — Salmon are endangered and near the sight
SHORELINE — L15-0032
• Pg1, Site Description - The river is tidally influenced at the uppermost point. Revise the
document to reflect this.
• Pg5 — Please provide details of the proposed Tree Protection if it will vary from the code.
• Pg5 — Please provide the approximate square footage of the project (to verify for tree count).
• Pg6 — Erosion control details should be provided, both for proposed and contingency. When will
you determine if contingency is needed? Do you plan to do turbidity testing?
• Pg6 — Please provide a maintenance plan/detail from the building owner. How often? Watering?
etc.
• Pg6 — Watering is needed for first three years from at least July to October, depending on
conditions. How will the site be watered?
• Pg7 — Given the small size of the site, is it possible to monitor the whole site in lieu of
establishing a transect? Photos will be required.
Additional comments:
• Please provide more information on how the fabric will affect recruitment? How long does it
take to break down? Is mulch to be used?
• Please provide diagram of planting extent — how far toward OHW will you plant? Consider
using willow stakes at base of slope.
Please feel free to contact me with any questions at (206) 433-7140.
Sincerely,
Valerie Lonneman
Assistant Planner
Page 2 of 2
RECEIVED
GEOENGINEERS.g AUG 07 2015
T K
Plaza 600 Building, 600 Stewart Street, Suite 1700, Seattle, Washington 98101, Telet9pga2 WIL RK6206.728.2732
Memorandum
www.geoengineers.com
To:
From:
CC:
Date:
GEI File:
Subject:
Valerie Lonneman, City of Tukwila Assistant Planner
Thomas Bannister and Jon Ambrose, GeoEngineers
Kurt Schneider, LD Schneider and Associates
July 30, 2015
21493-001-01
Response to Correction Letter #1; L15-0032, E15-0007
AUG 0 6 2015
Community
Development
The purpose of this memorandum is to provide responses to the City of Tukwila's (City) Correction Letter #1,
dated July 14, 2015. The City sent Correction Letter #1 to Thomas Bannister requesting additional information
regarding LD Schneider's Green River Bank Erosion Repair project located at 14900 Interurban Avenue in
Tukwila, Washington. The City's Correction Letter #1 includes comments from Dave McPherson of the Public
Works Department and Valerie Lonneman of the Planning Department.
Below are our responses to the City's comments:
Public Works - Dave McPherson
1. State Environmental Policy Act (SEPA) (E15-0007) - GeoEngineers revised the SEPA Checklist per
Dave McPherson's comments.
2. Shoreline (L15-0032)
a. GeoEngineers recognizes that the USGS identifies the Green River at the site as tidally influenced
and we have revised the design report accordingly.
b. The existing asphalt trail has been damaged from slope failure and is currently closed. No changes
to the existing trail are proposed as part of this project. Under an existing easement with
LD Schneider, the City agreed to maintain the trail within 40 feet of the Ordinary High Water Mark
of the Green River. This easement agreement is attached to the GeoEngineers Design Report.
Because the existing trail is located at the top of the bank and at the landward limits allowed by
the easement, future trail realignment is not likely. Following bank grading, the trail may be
reinstalled in a similar alignment and surfaced with gravel or asphalt.
Planning - Valerie Lonneman
1. SEPA (E15-0007)
c. The project will require the following materials:
i. Approximately 160 cubic yards of native material will be excavated, stockpiled and
returned to the riverbank following installation of the proposed drainage system.
ii. Approximately 160 cubic yards of clean river bank fill, as specified on Sheet 2 of the revised
project designs, will be acquired from a local aggregate source.
iii. Approximately 96 cubic yards of topsoil for planting medium, as specified on Sheet 2 of
the revised project designs, will be acquired from a local supplier.
Memorandum to City of Tukwila
July 30, 2015
Page 2
iv. Approximately 3 cubic yards of washed and clean drainrock, as specified on Sheet 2 of the
project designs, will be acquired from a local aggregate source.
v. Approximately 1 cubic yard of quarry spells as specified on Sheet 2 of the project designs,
will be acquired from a local aggregate source.
d. The existing asphalt trail has been damaged from slope failure and is currently closed. No changes
to the existing trail are proposed as part of this project. Under an existing easement with
LD Schneider, the City agreed to maintain the trail within 40 feet of the Ordinary High Water Mark
of the Green River. This easement agreement is attached to the GeoEngineers Design Report.
Because the existing trail is located at the top of the bank and at the landward limits allowed by
the easement, future trail realignment is not likely. Following bank grading, the trail may be
reinstalled in a similar alignment and surfaced with gravel or asphalt.
e. During construction, the contractor will install necessary erosion controls to prevent sediment from
entering the flow of the Green River. The project is located landward of ordinary high water mark
(OHWM) and no in -water work is proposed. Construction is scheduled to occur in September 2015
and river flow is expected to be very low with little risk of flow entering the work area. The contractor
will deploy necessary erosion and sediment controls in the event of rain during construction. If
necessary, the contractor will deploy additional contingency erosion controls, such as straw wattle
to comply with state water quality standards. We anticipate that a GeoEngineers Certified Erosion
and Sediment Control Lead (CESCL) will provide stormwater management guidance to the
contractor during construction. Turbidity in the Green River will be visually monitored during
construction. If the project results in a visible plume, the contractor will take immediate corrective
action by temporarily stopping earthwork activities and installing additional erosion controls. No
turbidity testing is proposed because discharge is not anticipated. Upon the completion of site
grading, the contractor will immediately install coir erosion control fabric intended to stabilize the
site until vegetation is restored to the bank.
f. No endangered plant species are known to occur near the site. Endangered Pacific Salmon occur
in the Green River as noted on Page 9 of the SEPA checklist.
2. Shoreline (L15-0032)
a. GeoEngineers recognizes that the USGS identifies the Green River at the site as tidally influenced
and we have revised our report accordingly.
b. The seven mature sycamore trees at the site are extremely valuable to the owner and they will be
protected during construction. Because of the lack of available space at the site, it is not possible
to protect the mature sycamore per City Code. The contractor will install construction fencing along
the landward edge of the work area, waterward of the seven existing sycamore tree following
guidance from GeoEngineers. If necessary, the contractor will install 4-foot tall plywood boxes
around the trunks of the sycamore trees. During site grading, the contractor will take care when
operating equipment in the vicinity of the trees. It is anticipated that the GeoEngineers biologist will
be on site observing grading activities in the vicinity of the trees.
c. The anticipated area to be revegetated is approximately 4,900 square feet. To restore native
riparian vegetation in this area, we recommend the following plant schedule:
Disclaimer: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/orfigure), if provided, and any attachments are only a copy of the
original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record.
Memorandum to City of Tukwila
July 30, 2015
Page 3
Estimated
Quantity
12
14
12
12
40
40
40
40
40
d.
Common Name
Black cottonwood
Western red cedar
Big leaf maple
Pacific dogwood
Vine maple
Oceanspray
Snowberry
Western serviceberry
Red osier dogwood
Scientific Name
Populus balsamifera
Thuja plicata
Acer macrophyllum
Corpus nutalli
Acer circinatum
Holodiscus discolor
Symphoricarpos albus
Amelanchier alnifolia
Corpus sericea
Size
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
24—inch in height
24—inch in height
24—inch in height
24—inch in height
Spacing
10 feet o.c.
10 feet o.c.
10 feet o.c.
10 feet o.c.
5 feet o.c.
5 feet o.c
5 feet o.c
5 feet o.c
5 feet o.c
As described above, discharge to the river is not anticipated and turbidity measurement is not
proposed. Turbidity will be visually monitored during construction and the contractor will postpone
earthwork and take corrective action if a visible sediment plume is observed in the river.
e. The owner will maintain the site by removing undesirable vegetation from the site during their
routine grounds maintenance regimen. The owner will irrigate newly planted trees/shrubs, on an
as -needed basis, from July to October. The owner expects that watering may be required on a
weekly basis during the summer. Watering will be completed using a hose or installed irrigation
system.
f. Monitoring the whole site would require visually estimating the areal cover of the whole site.
Estimating areal cover of the entire site may result in some subjectivity whereas, measuring the
areal cover along a transect is more objective and repeatable. No revisions to the monitoring
methods are proposed unless it is a condition of the City's authorization. Photos will be submitted
with annual monitoring reports.
GeoEngineers specifies a 100-percent biodegradable coir erosion control blanket. It is our
experience that this material does not substantially impact volunteering of plants. The expected
functional lifespan of this biodegradable material is less than two years.
g.
h. Native trees and shrubs will be installed in the disturbed areas of the site as illustrated in Sheet 4
of the revised design plans. Plants may be installed down to the OHWM, depending on the actual
area disturbed during construction. Willows are not recommended because of the lack of sufficient
hydrology for these species.
We have revised our project design report, design plans and SEPA Checklist to reflect the revisions discussed
in this memo. Those materials are included in this submittal package. Please contact Thomas Bannister at
206-251-1025 if you need additional information or clarification.
Disclaimer. Any electronic form, facsimile or hard copy of the original document (email, text, table, and/orfigure), if provided, and any attachments are only a copy of the
original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record.
SEPA Checklist
STATE ENVIRONMENTAL POLICY ACT CHECKLIST
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
A. BACKGROUND
1. Name of proposed project, if applicable:
Green River Bank Erosion Repair
2. Name of Applicant:
LD Schneider and Associates
3. Date checklist prepared:
May 18, 2015, Revised July 31, 2015
4. Agency requesting checklist:
City of Tukwila
5. Proposed timing or schedule (including phasing, if applicable):
Construction is scheduled to begin September 1, 2015
6. Do you have any plans for future additions, expansion, or further activity related to or
connected with this proposal? If yes, explain.
No
7. List any environmental information you know about that has been prepared, or will be
prepared, directly related to this proposal.
Analysis and Design Report by GeoEngineers
8. Do you know whether applications are pending for governmental approvals of other
proposals directly affecting the property covered by your proposal? If yes, explain.
No
Agency Comments
\\deptstore\City Common \ Teri \KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 1
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
9. List any government approvals or permits that will be needed for your proposal.
Shoreline Substantial Development permit from the City of Tukwila.
Hydraulic Project Approval (HPA) from the Washington Department of Fish and Wildlife.
10. Give brief, complete description of your proposal, including the proposed uses and the
size of the project and site. There are several questions later in this checklist that ask
you to describe certain aspects of your proposal. You do not need to repeat those
answers on this page.
The project consists of installing a subsurface gravity drainage system to transport water away
from the failure plane and rebuilding the riverbank using a combination of structural fill and
topsoil. The subsurface drainage system consists of a perforated 4-inch schedule 40 PVC pipe
that will capture subsurface water along the 165-foot length of the bank repair.
11. Location of the proposal. Give sufficient information for a person to understand the
precise location of your proposed project, including a street address, if any, the tax lot
number, and section, township, and range. If a proposal would occur over a range of
area, provide the range or boundaries of the site(s). Provide a legal description, site
plan, vicinity map, and topographic map, if reasonably available. While you should
submit any plans required by the agency, you are not required to duplicate maps or
detailed plans submitted with any permit applications related to this checklist.
The project is located on the bank of the Green River immediately Southeast of the building
located at 14900 Interurban Avenue South.
12. Does the proposal lie within an area designated on the City's Comprehensive Land Use
Policy Plan Map as environmentally sensitive?
Yes
SEPA Checklist
Agency Comments
\\dcpt. tore\City Camman\Teri\KJRBY - DECEMBER\SEPA Environmental Review Application-Jam2011.docx
Page 2
SEPA Checklist
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
B. ENVIRONMENTAL ELEMENTS
I. Earth
a. General description of the site (circle one): Flat, rolling, hilly, steep slopes,
mountainous, other:
The project is located on the bank of the Green River
b. What is the steepest slope on the site (approximate percent slope)?
The river bank is naturally at an approximate 25-30 percent slope. However, the
escarpment from the recent bank slough is nearly vertical and approximately 9 feet high.
. What general types of soils are found on the site (for example, clay, sand, gravel,
peat, muck)? If you know the classification of agricultural soils, specify them and
note any prime farmland.
Alluvium consisting of very loose to medium dense silty sand to a depth of approximately
35 feet.
d. Are there surface indications or history of unstable soils in the immediate vicinity?
If so, describe.
Yes, the bank at this location is subject to drawdown failures.
e. Describe the purpose, type, and approximate quantities of any tilling or grading
proposed. Indicate source of fill.
Approximately 420 yd3 of cut and fill:
• Approximately 160 yd3 of native material to remain on site.
• Approximately 160 yd3 of imported riverbank fill.
• Approximately 96 yd3 of imported topsoil.
• Approximately 3 yd3 of 1-inch drain rock.
• Approximately 1 yd3 of imported outfall protection.
\\deptstore\City Cotnmon\Tcri\K1ROY - DECEMBER\SEPA Environmental Review Application-Jan201 l.docx
Page 3
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
f. Could erosion occur as a result of clearing, construction, or use?
If so, generally describe.
Yes, erosion could result during clearing of the bank. This erosion will be minimized by
installing erosion and sediment controls during construction. The site will be permanently
stabilized using a robust revegetation plan.
g. About what percent of the site will be covered with impervious surfaces after
project construction (for example, asphalt or buildings)?
No new impervious surface is proposed. The trail damaged from slope failure and is
closed. Owner may propose trail improvements as part of a future submittal. City agreed to
maintain the trail within 40 feet of the OHWM of the Green River. Because the existing
trail is located at the top of the bank and at the landward limits allowed by the easement,
future trail realignment is not likely.
h. Proposed measures to reduce or control erosion, or other impacts to the earth, if
any:
Temp erosion/sediment controls will be installed prior to site work. Primary water quality
protection will be a silt fence installed on the downslope construction limits, near OHWM.
Contingency protections include add'l silt fence, silt curtains & straw wattles. Stormwater
discharge from the site to be visually monitored. Stormwater discharge is not anticipated
during construction because of the typically hot/dry conditions during the expected
construction period in Sept. 2015. No work/equipment will occur waterward of OHWM.
2. Air
a. What types of emissions to the air would result from the proposal (for example,
dust, automobile odors, industrial wood smoke) during construction and when the
project is completed? If any, generally describe and give approximate quantities if
known.
Minor emissions will result from the use of construction equipment and trucking of
materials.
b. Are there any off -site sources of emissions or odor that may affect your proposal?
If so, generally describe.
No.
SEPA Checklist
Agency Comments
\\deptstore\City Common \ Teri \KIRBY - DECEMBER\SEPA Environmental Review Application-Jan20l 1.docx
Page 4
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
c. Proposed measures to reduce or control emissions or other impacts to air, if any:
None,
3. Water
a. Surface:
1. Is there any surface water body on or in the immediate vicinity of the site
(including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)?
If yes, describe type and provide names. If appropriate, state what stream or
river it flows into.
The Green River is located immediately waterward of the site. The Green River is a
Shoreline of the State (Type S).
2. Will the project require any work over, in, or adjacent to (within 200 feet) the
described waters? If yes, please describe and attach available plans.
Yes. The project will be located wholly within 200 feet of the Ordinary High Water
Mark (OHWM) of the Green River.
3. Estimate the amount of fill and dredge material that would be placed in or
removed from surface water or wetlands and indicate the area of the site that
would be affected. Indicate the source of fill material.
None. No work will occur waterward of the OHWM.
SEPA Checklist
Agency Comments
\\dept,tore\City Common\TcriUURI3Y - DECEMBER\SEPA Environmental Review Application•lan2011.docx
Page 5
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
4. Will the proposal require surface water withdrawals or diversions? Give
general description, purpose, and approximate quantities, if known.
No.
5. Does the proposal lie within a 100-year floodplain? If so, note location on the
site plan.
Yes.
6. Does the proposal involve any discharges of waste materials to surface waters?
If so, describe the type of waste and anticipated volume of discharge.
No.
b. Ground:
1. Will ground water be withdrawn, or will water be discharged to ground water?
Give general description, purpose, and approximate quantities, if known.
No.
SEPA Checklist
Agency Comments
\WeptatnrelCity Common \Teri\K1RBY - DECEMBER\SEPA Environmental Review Application-lan2OI t ,docx
Page 6
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
2. Describe waste materials that will be discharged into the ground from septic
tanks or other sources, if any (for example: Domestic sewage; industrial,
containing the following chemicals...; agricultural; etc). Describe the general
size of the system, the number of such systems, the ntunber of houses to be
served (if applicable), or the number of animals or humans the system(s) are
expected to serve:
None.
c. Water Runoff (including storm water):
1. Describe the source of runoff (including storm water) and method of collection
and disposal, if any (include quantities, if known). Where will this water flow?
Will this water flow? Will this water flow into other waters? If so, describe.
The project consists of installing a subsurface gravity drainage system to transport
water away from the riverbank. The drainage system consists of PVC pipe that will
capture subsurface water along the 165-foot length of the bank repair. This
groundwater will flow to outfalls located at OHWM of the Green River. We anticipate
that this flow will be less than 1 gallon per minute under normal conditions.
2. Could waste materials enter ground or surface waters? If so, generally
describe.
No.
d. Proposed measures to reduce or control surface, ground, and runoff water impacts,
if any:
Surface water runoff from the site is not anticipated. Outfall protection will be installed to
minimize the potential fro erosion of the bank.
SEPA Checklist
Agency Comments
\\deptstore\City Common\Teri\KIRBY - DCCLsMBWR\SBPA Environmental Review Application-Jan2O1 l.docx
Page 7
SEPA Checklist
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
4. Plants
a. Check or circle types of vegetation found on the site:
✓
Deciduous tree: alder, maple, aspen, other
—
Evergreen tree: fir, cedar, pine, other
✓
Shrubs
Grass
Pasture
Crop or grain
Wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other
Water plants: water lily, eelgrass, milfoil, other
Other types of vegetation
b. What kind and amount of vegetation will be removed or altered?
Vegetation that will be removed consists of noxious and invasive Himalayan blackberry
and English ivy.
c. List threatened or endangered species known to be on or near the site.
None.
d. Proposed landscaping, use of native plants, or other measures to preserve or
enhance vegetation on the site, if any:
Noxious and invasive species will be removed from the project area and the bank will be
restored with native trees and shrubs.
Agency Comments
1ldepttorre\City Conlon\Teri\KERE3Y - DE CFMI3FR\SFPA Environmental Review Application-Jan20I i_dncx
Page 8
SEPA Checklist
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
5. Animals
a. Circle any birds or animals which have been observed on or near the site or are
known to be on or near the site:
Birds:
eawD heron, 4n, on bird other:
Mammals:
Deer, bear, elk, beaver, Wier:
Fish:
Bass, almo ou herring, shellfish, other:
Other:
b. List any threatened or endangered species known to be on or near the site.
The Green River is habitat for endangered Pacific salmon including Chinook salmon,
steelhead trout and bull trout.
c. Is the site part of a. migration route? if so, explain.
Yes. The green River is a primary migration route for anadromous salmonids. This area is part
of the Pacific Flyway, a primary corridor for migratory bird species.
d. Proposed measures to preserve or enhance wildlife, if any:
The project propsed to substantially enhance riparian habitat by removing invasive plants
and installing native trees and shrubs.
6. Energy and Natural Resources
a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet
the completed project's energy needs? Describe whether it will be used for heating,
manufacturing, etc.
None.
\\deptstore\City Common1Teri\KIRBY - DECEMBER\S) PA Environmental Review Applieetion-Ju 01 l.docx
Page 9
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
b. Would your project affect the potential use of solar energy by adjacent properties?
If so, generally describe.
No.
c. What kinds of energy conservation features are included in the plans of this
proposal? List other proposed measures to reduce or control energy impacts, if any:
None.
7. Environmental Health
a. Are there any environmental health hazards, including exposure to toxic chemicals,
risk of fire and explosion, spill, or hazardous waste, that could occur as a result of
this proposal? If so, describe.
No.
1. Describe special emergency services that might be required.
None.
2. Proposed measures to reduce or control environmental health hazards, if any:
None.
SEPA Checklist
Agency Comments
1\depistore\City ConfmonVrcri\K.IRI3Y - DECEMI3ER\SEPA Environmental Review Application-]an2011.doex
Page 10
SEPA Checklist
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
b, Noise
1. What types of noise exist in the area which may affect your project (for
example: traffic, equipment, operation, other)?
The project will not be affected by existing sources of noise.
2. What types and levels of noise would be created by or associated with the
project on a short-term or long-term basis (for example: traffic, construction,
operation, other)? Indicate what hours noise would come from the site.
The project will result in short term elevated levels of noise from construction
equipment. However, baseline noise levels are high due to traffic on Interurban
Avenue South and an existing capital improvement project adjacent to the site.
3. Proposed measures to reduce or control noise impacts, if any:
None.
S. Land and Shoreline Use
a. What is the current use of the site and adjacent properties?
The site is currently used as light commercial office space with associated parking areas.
b. Has the site been used for agriculture? If so, describe.
Yes, Aerial imagery from King County indicates that the site was farmed in the 1930's.
1\deptstora\City Common\TeriUURBY - DECEMBER\SEPA Environmental Review Application-Jan301 l.docx
Page 1 1
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
G. Describe any structures on the site.
An approximately 57,000 square -foot, 2-story office building and parking areas are located
on the parcel.
d. Will any structures be demolished? If so, what?
No.
e. What is the current zoning classification of the site?
Regional Commercial Mixed -Use (RCM).
f. What is the current comprehensive plan designation of the site?
Regional Commercial Mixed -Use (RCM).
g. If applicable, what is the current shoreline master program designation of the site?
Urban Conservancy.
SEPA Checklist
Agency Comments
11deptstnre\City Cammon\Teri\KIRBY - DECEMBER\SEI'A Environmental Review Appliontion-Jan2011.docx
Page 12
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
li, Has any part of the site been classified as an "environmentally sensitive" area? If
so, specify.
Yes. The site is wholly within the 100-foot wide river buffer.
i. Approximately how many people would reside or work in the completed project?
None.
j. Approximately how many people would the completed project displace?
NOne.
k. Proposed measures to avoid or reduce displacement impacts, if any:
N/A.
1, Proposed measures to ensure the proposal is compatible with existing and projected
land uses and plans, if any:
N/A.
SEPA Checklist
Agency Comments
lldeptxmrc\City Common \Teri KlRBY • DECEAMBER\SEPA Environmental Review Application-inn201 I.docx
Page 13
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
9. Housing
a. Approximately how many units would be provided, if any? Indicate whether high,
middle, or low-income housing?
N/A.
b. Approximately how many units, if any, would be eliminated? Indicate whether
high, middle, or low-income housing.
N/A.
c. Proposed measures to reduce or control housing impacts, if any:
N/A.
10. Aesthetics
a. What is the tallest height of any proposed structure(s), not including antennas; what
is the principal exterior building material(s) proposed?
N/A.
b. What views in the immediate vicinity would be altered or obstructed?
The prosposed trees may obscure the the existingviews of the river.
SEPA Checklist
Agency Comments
\\deptslore\City Common\Teri\KIRBY - D1:CEMtiER\SliPA Environmental Revinv Application-Jan2011.docx
Page 14
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
c. Proposed measures to reduce or control aesthetic impacts, if any:
The proposed planting plan has been developed to maintain existing view corridors to the
extent practical.
11. Light and Glare
a. What type of light or glare will the proposal produce? What time of day would it
mainly occur?
None.
b. Could light or glare from the finished project be a safety hazard or interfere with
views?
N/A.
c. What existing off -site sources of light or glare may affect your proposal?
None.
d. Proposed measures to reduce or control light and glare impacts, if any:
N/A.
SEPA Checklist
Agency Comments
\\depI tore\City Common\Teri\KIRRY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 15
SEPA Checklist
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
12. Recreation
a. What designed and informal recreational opportunities are in the immediate
vicinity?
The owner maintains an existing asphalt pedestrian trial located at the top of the riverbank..
A primitive trail is located approximately 200 feet south of the site which is used by
anglers to access the river.
b. Would the proposed project displace any existing recreational uses? If so, describe.
No.
c. Proposed measures to reduce or control impacts on recreation, including recreation
opportunities to be provided by the project or applicant, if any:
None.
13. Historic and Cultural Preservation
a. Are there any places or objects listed on, or proposed for, National, State, or Local
preservation registers known to be on or next to the site? If so, generally describe.
None known.
1ldtptstoralCity Common\Tcri\KIRBY - DECEMBERISEPA Environmental Review Application-Jan201 I.docx
Page 16
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
b. Generally describe any landmarks or evidence of historic, archaeological,
scientific, or cultural importance known to be on or next to the site.
None known.
c. Proposed measures to reduce or control impacts, if any:
N/A
l4, `transportation
a. Identify public streets and highways serving the site, and describe proposed access
to the existing street system. Show on site plans, if any.
The site is accessed from Interurban Avenue South via the existing parking area on the
south side of the property.
b. Is the site currently served by public transit? If not, what is the approximate
distance to the nearest transit stop?
Bus routes are located on Interurban Avenue South. Bus stops are located approximately
500 feet north and south of the site.
c. How many parking spaces would the completed project have? How many would
the project eliminate?
The project proposes no parking and no parking will be eliminated.
SEPA Checklist
Agency Comments
\\deptstore\City Commun\Teri\KIRBY - DECEMBER\SEPA Environntentul Review Application-lan20114ocx
Page 17
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
d. Will the proposal require any new roads or streets, or improvements to existing
roads or streets, not including driveways? If so, generally describe (indicate
whether public or private).
No.
e. Will the project use (or occur in the immediate vicinity of) water, rail, or air
transportation? If so, generally describe.
No.
How many vehicular trips per day would be generated by the completed project? If
known, indicate when peak volumes would occur.
No project will not generate vehicle trips.
g. Proposed measures to reduce or control transportation impacts. if any:
N/A.
15. Public Services
a. Would the project result in an increased need for public services (for example: fire
protection, police protection, health care, schools, other)? If so, generally describe.
No.
SEPA Checklist
Agency Comments
\\deptstore City Cummon\Teri\KIRBY - DECEMHI R\SEPA Environmental Review Appiication•Jan2011.docx
Page 18
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
b. Proposed measures to reduce or control direct impacts on public services, if any.
N/A.
16. Utilities
a. Circle utilities currently available at the site:
r eCtrici '� •� iiiiii'1( ,1railf Yar+ii•7+
system
other:
septic
b. Describe the utilities that are proposed for the project, the utility providing the
service, and the general construction activities on the site or in the immediate
vicinity which might be needed.
No utilities are proposed for the project.
SEPA Checklist
Agency Comments
Adeptstorc\City Common\Tcr11K1RBY - DECEMBER\SEPA Environmental Review Application-7un2011.docx
Page 19
SEP4 Checklist
(NON -PROJECT PROPOSALS (E.G., SUBURBAN PLANS AND ZONING CODE TEXT CHANCES) MUST
COMPLETE THE FOLLOWING PAGES).
C. SUPPLEMENTAL SHEET FOR NON -PROJECT PROPOSALS
(do not use this sheet for project actions)
Because these questions are very general, it may be helpful to read them in conjunction with the list of elements of
the environment.
When answering these questions, be aware of the extent the proposal, or the types of activities likely to result from
the proposal, would affect the item at a greater intensity or at a faster rate than if the proposal were not
implemented. Respond briefly and in general terms.
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
1. How would the proposals be likely to increase discharge to water; emissions to air;
production, storage, or release of toxic or hazardous substances; or production of noise?
Proposed measures to avoid or reduce such increases are:
2. How would the proposal be likely to affect plants, animals, fish, or marine life?
Proposed measures to protect or conserve plants, animals, fish, or marine life are:
\\Jeptstore\City Comtnon\Tcri\K1RBY - DECEMI3ER\SEPA Environmental Review Application-Jan2011.docx
Page 20
SEPA Checklist
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
3. How would the proposal be likely to deplete energy or natural resources?
Proposed measures to protect or conserve energy and natural resources are:
4. How would the proposal be likely to use or affect environmentally sensitive areas or
areas designated (or eligible or under study) for governmental protection; such as
parks, wilderness, wild and scenic rivers, threatened or endangered species habitats,
historic or cultural sites, wetlands, floodplains, or prime farmlands?
Proposed measures to protect such resources or to avoid or reduce impacts are:
5. How would the proposal be likely to affect land and shoreline use, including whether it
would allow or encourage land or shoreline uses incompatible with existing plans?
Agency Comments
\\deptetore\City Common\Teri1KIR$Y - DECEMIER\SEMA Environmental Review Apptication.Jun2011.ducx
Page 2 I
S.EPA Checklist
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
Proposed.measures to avoid or reduce shoreline and land use impacts are:
6. Row would the proposal be likely to increase demands on transportation or public
service and utilities?
Proposed measures to reduce or respond to such demand(s) are:
7. Identify, if possible, whether the proposal may conflict with Local, State, or -Federal
laws or requirements for the protection of the environment.
D. SIGNATURE
Agency Comments
Under the penalty of perjury the above answers under ESA Screening Checklist and State Environmental Policy Act
Checklist are true ancomplete to the best of my knowledge. I understand that the lead agency is relying on them to
make its decision
Signature:
Date Submitted:
1\deptstore\City Common \Teri\KIR13Y - DECEMBERISEPA Environmental Review Applicntion•den2011.docx
Page 22
♦J
GEOENGINEERS117
Plaza 600 Building
600 Stewart Street, Suite 1700
Seattle, Washington 98101
206.728.2674
July 30, 2015 fnt
LD Schneider and Associates Oe o� elf
3200 North Central Avenue, Suite 1470
� Phoenix, Arizona 85012
Attention: Kurt Schneider
4-1
INTRODUCTION
Subject: Revised Analysis and Design Report
Green River Bank Repair
14900 Interurban Avenue South
Tukwila, Washington
GeoEngineers File No. 21493-001-01
F ECEUVF
AU6 07 2015
TUKvviLA
PUBLIC WORKS
iJ
GeoEngineers, Inc. (GeoEngineers) is pleased to present an analysis of site conditions and a design to
repair an eroding bank along the Green River adjacent to the property at 14900 Interurban Avenue South
r-1
Permit and to the Washington State Department of Fish and Wildlife (WDFW) for a Hydraulic Project
Approval (HPA). We prepared this report to comply with the submittal requirements of Tukwila Municipal
Code (TMC) 18.44.
in Tukwila, Washington. The location of the site is mapped on Sheet C-1 in Appendix A. The purpose of this
report is to support an application to the City of Tukwila (City) for a Shoreline Substantial Development
`J GeoEngineers submitted the original version of this report to the City on June 24, 2015. Following receipt
of comment from the City, detailed in Correction Letter #1, we revised this report to address the City's
comments and to provide further clarification regarding the proposed project.
0-1
GeoEngineers assessed the causes of bank failure and developed multiple design alternatives for
consideration by the owner. We also evaluated the permitting considerations of each option. As part of our
preliminary work, we completed a site assessment and developed a design to address the mechanisms of
bank failure. This report details our methods and findings regarding site conditions, mechanism of
failure and presents permit level design drawings to mitigate for bank failure and restore the bank to a
functional condition.
7�
v
l'%uni
pm�
•,
lJ
LD Schneider and Associates July 30, 2015 Page 2
SITE DESCRIPTION AND CONDITIONS
The 3.6-acre property (Parcel #3597000006) is located on the left (west) bank of the Green River. An
approximately 57,000 square -foot, 2-story office building and parking areas are located on the parcel. The
parcel is generally flat and the river is not leveed. According to the US Geologic Survey (USGS), the
Green River is tidally influenced at this location. Overbank bank flooding is extremely rare, particularly on
the left bank of the river. The area of the parcel that is within 200 linear feet of the Ordinary High Water
Mark (OHWM) of the Green River is regulated under the City of Tukwila's Shoreline Master Program.
The Shoreline designation for the site is Urban Conservancy and the River has a buffer of 100 feet
measured from OHWM. The site is also designated as a Fish and Wildlife Habitat Conservation Area
per TMC 18.44.090 H.
A GeoEngineers biologist made a preliminary site visit on May 13, 2014. In general, the riverbank on the
property is vegetated with noxious and invasive Himalayan blackberry. Because of the infestation of
Himalayan blackberry and lack of trees, habitat conditions along the riverbank are degraded. GeoEngineers
observed evidence of a recent slough of the bank located approximately 100 feet southeast of the
commercial building on the property. The recent sloughing resulted in an approximately 10-foot high near
vertical escarpment that damaged an existing asphalt trail at the top of the bank. The trail is separated
from the parking lot by a landscaping island consisting of grass and a row of seven mature sycamore trees.
The biologist also observed water weeping from the bank at the toe of the escarpment. The biologist did
not observe environmentally sensitive areas, such as wetlands, during the site reconnaissance.
On August 12, 2014, a GeoEngineers geotechnical engineer, river hydrologist, and biologist evaluated slope
stability, habitat, and flow conditions at the site. During this site visit, the geotechnical engineer noted that
the soil exposed in the riverbank consisted of fine to medium silty sand and silt. This material is typical of
alluvium in the Green River valley. Bedrock was observed in the riverbanks upstream (south) of the property.
Bedrock is also known to be present (State of Washington Department of Natural Resources [DNR] Geology
Maps) on the hillside to the west of the site.
DNR maps the local geologic unit as the Puget Group (Tp). The Puget Group consists of sandstone, siltstone,
claystone, and coal which is white and very fine grained to gritty. The Tiger Mountain Formation, which
consists of light-colored, medium -grained sandstone with siltstone, minor pebble conglomerate, and coal
beds, is mapped in isolated outcrops in the river valley. The Renton Formation (Tpr), which is a fine- to
coarse -grained sandstone with interbedded siltstone, claystone, and coal, is mapped on the hillside to the
west of the site. Alluvial deposits (Qal) are mapped immediately adjacent to the site as comprising the river
bed and riverbanks. Alluvium is described as a mix of moderately to poorly sorted granular soils deposited
by the river.
We completed two subsurface geologic explorations at the top of the recently sloughed area where the trail
has become undermined and approximately halfway between this point and the corner of the building.
These explorations were performed with a track -mounted drill rig and advanced to a depth of 36.5 feet (at
the top of the slough) and 51.5 feet (nearer to the building). Summary logs of our explorations are included
as Appendix A.
The subsurface conditions at the site is consistent with a glacial channel that was carved into siltstone and
sandstone and then partially filled with more recent alluvium from the Green River. We observed the
alluvium to consist of very loose to medium dense silty sand to a depth of approximately 35 feet. We
GEOENGINEERS�
File No. 21493-001-01
LD Schneider and Associates July 30, 2015 Page 3
lJ
observed the silty sand material to overlie a white to light gray sandstone with fine inclusions of coal layers.
We interpret this sandstone to be a part of the Tiger Mountain Formation of the Puget Group. The two
borings were terminated within the sandstone.
We observed groundwater in the borings at a depth of approximately 12-14 feet below ground
surface, which is consistent with earlier observations of groundwater seeping out from the toe of the
sloughed surface.
MECHANISM OF BANK SLOUGHING
Based on our observations at the site and experience in the Green River valley, it is our opinion that the
bank sloughing is most likely due to a drawdown failure. This type of failure occurs when high groundwater
levels and high river levels saturate the riverbank soil and then the river levels drops or "draws down" faster
than the water can drain from the riverbank soil. This creates an imbalance of water pressure. The water
pressure pushing the bank from within the soil is no longer balanced by the water pressure from the river
and the riverbank is pushed into the river. In our experience, this is the most common riverbank failure
mechanism on the lower Green River.
Toe erosion is also a failure mechanism that is common on the Green River and often found in conjunction
with drawdown failures. Toe erosion will weaken a riverbank but the ultimate failure is triggered by
drawdown. At this site, the presence of shallow bedrock makes toe erosion less likely to be a significant
contribution to the failure of the riverbank.
In addition to site observations, bathymetric data of the channel bottom was obtained from King County.
Cross sections of the channel bottom in the vicinity of the site do not show the large scour holes typically
evident in areas where toe erosion is a major contributor to slope instabilities. We do not believe toe erosion
to be a contributing factor in the of bank sloughing at the site.
PROJECT DESIGN
We developed a permit -level design to mitigate for the bank sloughing and also to address potential future
drawdown failures. Permit level design drawings are included as Appendix B. The design objective was to
develop a plan appropriate for the site geology and geometry using techniques and materials most likely to
r� be approved by regulatory agencies and offer long term protection. During preliminary design, we
considered bio-engineered and hard engineering approaches. The identified design options are located
landward of the OHWM for permitting efficiency. Additionally, we believe work waterward of OHWM is
unnecessary because the mechanism of failure is not a result of toe erosion. As such, the project will avoid
LJ impacts to aquatic habitat at the site.
Riverbank Drainage
The project consists of installing a subsurface gravity drainage system to transport water away from the
failure plane and rebuilding the riverbank using a combination of structural fill and native soil. The
subsurface drainage system consists of a perforated 4-inch schedule 40 polyvinyl chloride (PVC) pipe that
will capture subsurface water along the 165-foot length of the bank repair. Solid 4-inch PVC finger drains
set at approximately 20-foot intervals will convey the water from the perforated pipe to outfalls located
GEOENGINEERS
File No. 21493-001-01
LJ
LD Schneider and Associates July 30, 2015 Page 4
landward of OHWM. Small rock will be installed at the outfalls to protect against erosion. This rock is
designed to withstand flows from the pipe and sheer stress of river flows under anticipated conditions.
This design will reduce the water pressure upgradient of the riverbank and thereby reduce the potential for
future drawdown failures. The project is designed to address the primary cause of bank failure (drawdown)
and does not include design elements to protect against toe erosion or scour.
We anticipate that a qualified contractor will install the drainage system and restore the bank using a
medium-sized track mounted excavator and other support equipment. The project will be completed during
WDFW's allowable in water work window, or approximately August 1- August 31. Construction is estimated
to take approximately 2 weeks. Because the project is located in the 100-foot buffer of the Green River,
TMC 18.44.090 E(4) requires the owner, the specialist of record (GeoEngineers), the contractor
and representatives from the City of Tukwila to attend a preconstruction meeting at the site. Per
TMC 18.44.090 E(5), GeoEngineers will be retained to monitor construction.
We estimate that approximately 420 cubic yards (yd3) of material will be cut and filled to complete the
project. Of this 420 cubic yards of material, approximately 160 cubic yards will be native material that will
remain on site and will be incorporated back into the riverbank. It will be necessary to import additional
material to achieve the design elevations and grades. This material and the estimated quantities are listed
below.
Anticipated Material Schedule
Approximately 420 yd3 of cut and fill:
• Approximately 160 yd3 of native material to remain on site.
• Approximately 160 yd3 of imported riverbank fill.
• Approximately 96 yd3 of imported topsoil.
• Approximately 3 yd3 of 1-inch drain rock.
• Approximately 1 yd3 of imported outfall protection.
Stability Analysis of Design
We analyzed the proposed slope repair using the computer program SLOPE/W (GEO-SLOPE International,
Ltd., 2012). The SLOPE/W program evaluates the stability of numerous trial shear surfaces using a vertical
slice limit -equilibrium method (Morgenstern -Price). This method compares the ratio of forces driving slope
movement to the forces resisting slope movement for each trail shear surface, and presents the ratio as
the factor of safety. The program then sorts the trail shear surfaces and identifies the surface with the
lowest factor of safety, or the "critical" shear surface.
We first analyzed the slope in what was likely its configuration just prior to the slough occurring. Our analysis
was based on the subsurface data collected in our explorations and on groundwater conditions consistent
with a drawdown condition. For this condition we calculate that the factor of safety is less than 1.0. This
indicates that the forces driving slope movement exceed the forces resisting slope movement and that the
slope would fail. Additionally, the calculated critical shear surface is similar to the observed shear surface
of the slough. This result further corroborates our opinion that the bank slough was triggered by drawdown.
GEOENGINEERS,..0
File No. 21493-001-01
LD Schneider and Associates July 30, 2015 Page 5
We then analyzed the slope with the proposed repair in place. In this case we calculate that the factor of
safety against a drawdown type failure is 1.3, indicating that the forces available for resisting slope
movement exceed the forces driving slope movement by about 30 percent. As a point of reference, the
United States Army Corps of Engineers (USACE) recommends a calculated factor of safety greater than
about 1.0 or 1.1 against drawdown failures.
Site Restoration
Following installation of the riverbank drainage, the disturbed areas will be restored and enhanced.
The design goal for the project is to reconstruct the bank at an approximate pre -slough slope angle, or
2.5:1 slope. However, the slope angle of the bank reconstruction will be established to fit within the site
constraints, including avoiding damage to the large sycamore trees atop the bank, limiting disturbance to
the root zone and transitioning into the native banks adjacent to the repair. To accommodate this slope
angle, the existing asphalt trail at the top of the bank may need to be realigned. The alignment of the trail
will be established following restoration of the bank. However, under an existing easement with the property
owner, the City will maintain the trail within 40 feet of OHWM. The easement agreement is included as
Appendix D.
Due to the anticipated sheer force during high flow events in the river, we anticipate that the reconstructed
bank will require additional erosion protection. 0ur design includes a biodegradable erosion control fabric
designed to withstand sheer stresses under normal flow conditions. The erosion control fabric will also
stabilize the bank slope from raveling during heavy rain events.
Because the project will be completed landward of OHWM, we do not anticipate temporary or permanent
impacts to the aquatic habitat of the Green River. Temporary impacts will be limited to the blackberry and
English ivy infested bank above OHWM. No trees will be removed as part of the project.
The seven mature sycamores along the top of bank will be protected during construction per the
requirements of the Shoreline Substantial Development permit. Because of the proximity of these mature
trees to the work area it is not practical to protect the trees in the manner required by TMC 18.44.080 B
(10). GeoEngineers recommends that the contractor establish tree protections at the maximum practical
distance from the trunks of the sycamore trees to complete the project. We recommend that the contractor
install high visibility construction fencing between the work area on the bank and the sycamore trees that
are located approximately 15 to 20 feet landward from the top of the riverbank. If necessary that contractor
will install 4-foot high plywood boxes around the trunks to further protect the trees. During site grading, the
contractor will take care when operating equipment in the vicinity of the trees. It is anticipated that the
GeoEngineers biologist will be on site observing grading activities in the vicinity of the trees.
The work area is currently infested with Himalayan blackberry which will be removed during construction.
The project design includes aggressive revegetation to reestablish root strength and help stabilize
the bank. Native plant species will be densely installed in the areas disturbed by the project. Below is a list
of recommended plants to be installed at the site to reestablish root structure and appropriate
riparian habitat. The estimated plant quantities are based on a 4,900 square foot disturbance area.
Installed plant quantities may vary based on the actual disturbance area.
GEOENGINEERS
File No. 21493-001-01
LD Schneider and Associates July 30, 2015 Page 6
Estimated
Quantity
12
14
12
12
40
40
40
40
40
Common Name
Black cottonwood
Western red cedar
Big leaf maple
Pacific dogwood
Vine maple
0ceanspray
Snowberry
Western serviceberry
Red osier dogwood
Scientific Name
Populus balsamifera
Thuja plicata
Acer macrophyllum
Corpus nutalli
Acer circinatum
Holodiscus discolor
Symphoricarpos albus
Amelanchier alnifolia
Corpus sericea
Size
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
24—inch in height
24—inch in height
24—inch in height
24—inch in height
Spacing
10 feet o.c.
10 feet o.c.
10 feet o.c.
10 feet o.c.
5 feet o.c.
5 feet o.c
5 feet o.c
5 feet o.c
5 feet o.c
We developed this native plant palette based on our experience with riparian restoration and with guidance
from WDFW (Cramer, 2012). We increase the density of the installed trees to 10 feet on -center at the
request of WDFW (2015). Installed deciduous trees will be 2-inch caliper, conifer will be 6-8 foot height and
shrubs will be 24-inch height in compliance with TMC 18.44.080 C(1)(j). Trees will be planted on 10-foot
spacing per WDFW's request and shrubs will be planted on 5-foot spacing per TMC 18.,44.080 C(2)(d).
To enhance aquatic habitat, the GeoEngineers biologist will provide guidance to the contractor in installing
the plants in locations that promote shade and overhanging vegetation near OHWM while maintaining the
view corridors of the existing riverfront trail. Large trees will be installed outside the drip line of the existing
sycamore trees. The planting plan also accounts for the seasonally fluctuating river levels and variable
hydrology up the slope of the riverbank. Because of the typical hot and dry conditions during WDFW's
allowable work window, we recommend that the revegetation of the riverbank be delayed until late fall.
Planting in late summer will likely result in plant failure and poor revegetation. The erosion control fabric
installed on the riverbank will stabilize the bank in the interim between repair of the bank and site
revegetation.
To avoid and minimize water quality impacts during construction, temporary erosion and sediment controls
will be installed prior to site work. A silt fence will be installed on the downslope construction limits, near
OHWM, as the primary water quality protection. Contingency water quality protections include additional
silt fence, silt curtains and straw wattles. Stormwater discharge from the site will be visually monitored. It
is not anticipated that there will be a stormwater discharge during construction because of the typically hot
and dry conditions during the expected construction period in September 2015. No work will occur
waterward of OHWM and construction equipment will not work in the water. Should a problem arise the
contractor will postpone earthwork and take corrective action to comply with state water quality standards.
We estimate the cost to construct the bank repair to be approximately $65,000. 0ur Project Value
documentation is included as Appendix C.
GEOENGINEERS�
File No. 21493-001-01
LD Schneider and Associates July 30, 2015 Page 7
Maintenance and Monitoring
We anticipate that the riverbank drainage system will require minimal maintenance. Maintenance will
include occasional flushing of the system via backwashing from the outfalls. The frequency of this
maintenance will be determined on an as needed basis.
The restored vegetation on the bank will be managed by the on -site property management staff. We
anticipate that the riverbank will be maintained as a part of their routine maintenance regimen.
Maintenance will include physical removal of noxious and invasive species that may be detrimental to
the restored riparian habitat along the riverbank. These noxious and invasive species include but are not
limited to:
• Knotweeds (Polygonum spp.)
• Butterfly bush (Buddleja spp.)
• Himalayan blackberry (Rubus armeniacus)
• English ivy (Hedera helix)
• Scotch broom (Cytisus scoparius)
Use of chemical herbicides to control these species is considered unnecessary and is not recommended.
We recommend that the installed plants be watered during the dry season for a minimum of three years
following plant installation. This watering should occur during the late summer (July to October) and the
frequency shall be determined based on weather conditions and plant performance. We anticipate that the
site will be watered using a hose or a temporary irrigation system.
Beneficial volunteer plants, such as other native species, will be encouraged at the site. Installed plants
that do not survive will be replaced as required by the authorizations from the City of Tukwila and WDFW.
We anticipate that a provision of the permit issued by WDFW will require 80 percent survival of installed
plants for three years following construction of the project. The City of Tukwila will likely require monitoring
of the site for a period of five years following plant installation.
To monitor performance of the restored vegetation and to comply with project permits, a qualified biologist
will annually monitor the site for a period of five years following construction of the project. To track
vegetation performance at the site through the monitoring period, we recommend that the monitoring
biologist establish a transect along the bank. Using the line intercept method, the biologist will inventory
the number and species of native plants observed within 1 foot of either side of the transect shortly
following installation of the plants. The location, orientation and length of this transect will be determined
in the field by the biologist. The endpoints of the transect will be marked in the field. The biologist will return
to the site on an annual basis to complete the survival inventory at the location of the transect. The biologist
will determine annual survival rates which will be used to gauge compliance with WDFW's permit.
Our experience has shown that calculating survival rates is problematic because of the inherent difficulty
of identifying individual plants as the site matures. We recommend that the biologist also measure the
areal cover of beneficial vegetation along the length of the transect. It is our opinion that measuring the
areal cover of native plants is a better indicator of site performance, is more repeatable and results in less
variability amongst site investigators during the monitoring period. Native volunteer plants will be included
in the plant inventory and areal cover measurements for the remainder of the monitoring period. Monitoring
will include photo documentation of the site.
GEOENGINEERS
File No. 21493-001-01
LD Schneider and Associates July 30, 2015
Page 8
The biologist will complete monitoring events on an annual basis for five years following plant installation.
The findings of each monitoring event will be documented and the owner will submit annual reports to the
City of Tukwila and WDFW.
NO NET LOSS ANALYSIS AND MITIGATION SEQUENCING
Consistent with the City of Tukwila's Shoreline Master Program (SMP), this project will result in no net loss
of shoreline ecological function. The project will result in approximately 5,000 square feet of temporary
impacts to the shoreline. These impacts are necessary to eliminate the inherent public safety issue posed
by the slope failure and to maintain safe, public access to the shoreline on the property. To rectify these
unavoidable impacts, the project follows the mitigation sequencing steps identified in TMC 18.44.070 H(3).
Because the project is located landward of OHWM, it avoid impacts to the aquatic environment of the
Green River. The riparian habitat that will be impacted by the project is heavily degraded and infested with
noxious and invasive plants species. The project proposes to restore and enhance the riparian habitat by
removing invasive species and installing native trees and shrubs. The owner is committed to maintaining
and monitoring the impacted area to ensure the success of the restoration. As a result of these mitigation
steps, the project results in no net loss of shoreline ecological function.
We estimate that approximately 200 cubic yards of bank material sloughed into the river during a recent
drawdown failure. Much of this material has subsequently been eroded and carried downstream by the
river. The drawdown failure resulted a 9-foot high vertical escarpment that damaged the existing public
access trail. The escarpment poses a safety risk which has resulted in the closure of the trail. To eliminate
this safety hazard, the project will add approximately 160 cubic yards of fill material. This fill material is
intended to replace a portion of the bank lost as a result of drawdown failure. We consider this amount of
fill to be minor and will have no measureable impact to the hydrology, habitat or other shoreline function.
REFERENCES
Cramer, Michelle L. (managing editor). 2012. Stream Habitat Restoration Guidelines. Co -published by the
Washington Departments of Fish and Wildlife, Natural Resources, Transportation and Ecology,
Washington State Recreation and Conservation Office, Puget Sound Partnership, and the U.S. Fish
and Wildlife Service. Olympia, Washington.
•
WDFW. 2015. Personal Communication between Larry Fisher (WDFW) and Thomas Bannister r
(GeoEngineers) on June 9, 2015.
LIMITATIONS
We have prepared this revised report for LD Schneider and Associates for failing bank along the Green
River adjacent to the property at 14900 Interurban Avenue South in Tukwila, Washington.
Within the limitations of scope, schedule and budget, our services have been executed in accordance with
generally accepted practices in the fields of geotechnical engineering, hydrology, and restoration design
engineering in this area at the time this report was prepared. The conclusions, recommendations and
EO NGINEERS
File No. 21493-001-01
LD Schneider and Associates July 30, 2015 Page 9
opinions presented in this report are based on our professional knowledge, judgment and experience. No
warranty, express or implied, applies to our services and this report.
Any electronic form, facsimile or hard copy of the original document (email, text, table and/or figure), if
provided, and any attachments should be considered a copy of the original document. The original
document is stored by GeoEngineers, Inc. and will serve as the official document of record.
Sincerely,
L.1..1.151.J 1.
HSSocldie rlyuruiogisl
TAB:LIS:JMA:Ieh
Attachments:
Appendix A. Geologic Boring Logs
Appendix B. Permit Level Design Drawings
Appendix C. Project Value Documentation
Appendix D. Trail Easement Agreement
One copy submitted electronically
Senior Geotechnical Engineer
Disclaimer. Any electronic form, facsimile or hard copy of the original document (email, text, table, and/orfigure), if provided, and any attachments are only a copy
of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record.
GEOENGINEERS
File No. 21493-001-01
APPENDIX A
Geologic Boring Logs
LJ
SOIL CLASSIFICATION CHART
ADDITIONAL MATERIAL SYMBOLS
L J
..J
LJ
r-1
J
LJ
LJ
r7
LJ
n
J
n
n
L_J
n
tJ
LJ
LJ
n
LJ
u
n
LJ
MAJOR DMSIONS
SYMBOLS
TYPICAL
DESCRIPTIONS
GRAPH
LETTER
COARSE
GRAINED
SOILS
MORE THAN 50%
RETAINED ON NO.
zoo SIEVE
GRAVEL
AND
GRAVELLY
SOILS
MORE THAN 50%OF
COARSE FRACTIONIP
RETAINED ON NO.4
SIEVE
CLEAN
GRAVELS
(UTILE OR NO FINES)
OUV C
o ° o
) N�
Gw
WELL -GRADED GRAVELS,
GRAVEL -SAND MIXTURES
D 0 0
o o c
D O O
o C
GP
POORLY -GRADED GRAVELS,
GRAVEL - SAND MIXTURES
GRAVELS WITH
FINES
(APPRECIABLE
NES))Max+T
° GM
SILTY GRAVELS, GRAVEL - SAND
-SILT MIXTURES
Ap
G`.
CLAYEY GARAVELS, GRAVEL -
Y MIXTURES
SAND
AND
SANDY
SOILS
MORE THAN 50% OF
COARSE FRACTION
PASSING NO. 4
SIEVE
CLEAN SANDS
(LITRE OR NO FINES)
° ^
elm
WELL -GRADED GRAVELLY SANDS DS,
SP
POORLY -GRADED SANDS,
GRAVELLY SAND
SANDS WITH
FINES
(APPRECIABLE AMOUNT
OF FINES)
SM
SILTY SANDS, SAND - SILT
MIXTURES
/•/
SC
CLAYEY SANDS, SAND - CLAY
MIXTURES
FINE
GRAINED
SOILS
MORE THAN 50%
PASSING NO.200
SIEVE
SILTS
AND
CLAYS
LESSU%50
ML
INORGANIC SILTS, ROCK FLOUR,
CLAYEY SILTS WITH SLIGHT
PLASTICITY
CL
INORGANIC CLAYS OF LOW TO
MEDIUM PLASTICITY, GRAVELLY
CLAYS, SANDYEANCLAYSS, SILTY
OL
ORGANIC SILTS AND ORGANIC
SILTY CLAYS OF LOW
PLASTICITY
SILTS
CLAYS
LIQUID LIMIT
GREATER THAN 50
J
MH
INORGANIC SILTS, MICACEOUS
OR DIATOMACEOUS SILTY SOILS
/
Cl..l
GnACNITMCLAYS OF HIGH
P
OH
ORGANIC CLAYS AND SILTS OF
MEDIUM TO HIGH PLASTICITY
HIGHLY ORGANIC SOILS
PEAT, HUMUS, SWAMP SOILS
WITH HIGH ORGANIC CONTENTS
= — —
- - -
PT
NOTE: Multiple symbols are used to indicate borderline or dual soil classifications
LI
•
W
Sampler Symbol Descriptions
2.4-inch I.D. split barrel
Standard Penetration Test (SPT)
Shelby tube
Piston
Direct -Push
Bulk or grab
Continuous Coring
Blowcount is recorded for driven samplers as the number
of blows required to advance sampler 12 inches (or
distance noted). See exploration log for hammer weight
and drop.
A "P" indicates sampler pushed using the weight of the
drill rig.
SYMBOLS
TYPICAL
DESCRIPTIONS
GRAPH
LETTER
AC
Asphalt Concrete
CC
Cement Concrete
CR
Crushed Rock/
Quarry Spalls
TS
Topsoil/
Forest Duff/Sod
o/oF
AL
CA
CP
CS
DS
HA
MC
MD
OC
PM
P1
PP
PPM
SA
TX
UC
VS
NS
SS
MS
HS
NT
Groundwater Contact
Measured groundwater level in
exploration, well, or piezometer
Measured free product in well or
piezometer
Graphic Loa Contact
Distinct contact between soil strata or
geologic units
Approximate location of soil strata
change within a geologic soil unit
Material Description Contact
Distinct contact between soil strata or
geologic units
Approximate location of soil strata
change within a geologic soil unit
Laboratory / Field Tests
Percent fines
Atterberg limits
Chemical analysis
Laboratory compaction test
Consolidation test
Direct shear
Hydrometer analysis
Moisture content
Moisture content and dry density
Organic content
Permeability or hydraulic conductivity
Plasticity index
Pocket penetrometer
Parts per million
Sieve analysis
Triaxial compression
Unconfined compression
Vane shear
Sheen Classification
No Visible Sheen
Slight Sheen
Moderate Sheen
Heavy Sheen
Not Tested
NOTE: The reader must refer to the discussion in the report text and the logs of explorations for a proper understanding of subsurface conditions.
Descriptions on the logs apply only at the specific exploration locations and at the time the explorations were made; they are not warranted to be
representative of subsurface conditions at other locations or times.
KEY TO EXPLORATION LOGS
J
GEOENGINEERS
FIGURE A-1
Start End
Total 51 5
Depth (ft)
Logged BfAW/SST
Checked By LJS
Driller Holocene Drilling Inc.
Drilling Hollow Stem Auger
Method
Drilled 4/23/2015 4/23/2015
Surface Elevation (ft) 28
Vertical Datum NAVD88
Hammer Auto Hammer
Data 140 (Ibs) / 30 (in) Drop
Drilling Diedrich D50 Truck Rig
Equipment
Easting (X)
Northing (Y)
System
Datum
Groundwater
Depth to
Date Measured Water (ft) Elevation (ft)
Notes:
See Remarks
1 1 1 1 1 1 1 1 1 1 1 1 1 1 I I I I ♦
'o 's 20 `'s Elevation (feet)
'o o Depth (feet)
i i 1 1 i i 1 i 1 i i i i I i i i i I
FIELD DATA
Graphic Log I
Group
Classification
Moisture
Content (%)
Fines
Content (%)
Interval
Recovered (in)
Blows/foot
Collected Sample
Sample Name
Testing
Water Level
MATERIAL
DESCRIPTION
REMARKS
J 2
12
3
4
2A
ML
Brown silt with sand, occasional organic matter
(twigs, duff) (soft, moist)
1
1 18
4F
26
ML
_ Brown silt with sand (medium stiff, moist) _
(alluvium)
21
56
8
1
3
aA
MC
/
ML
Brown silt, trace sand (soft, moist) (alluvium)
48
18
1 18
1 14
118
5
9
10
7
4B
S
6
7
8A
SM
Gray silty sand (very loose, moist) (alluvium)
Grades to loose, wet
33
36
Groundwater observed at 14 feet at time of
drilling
- 20--]
) —
14
3
ae
9
%F
ML
_ Gray silt, trace sand (medium stiff, moist)
(alluvium)
57
98
- 25 --]SP-SM
-
30--I
_$n —
= 351
Note: See
16
12
18
Figure
22
21
25
A-1 for
t0
11
12
explanation of symbols.
_ Gray fine to coarse sand with silt (medium dense, —
wet) (alluvium)
Log of Boring B-1
GEOENGINEERS.g
Project:
Project Location:
Project Number:
Green River Bank Design and Permitting
Tukwila, Washington
21493-001-01
Figure A-2
Sheet 1 of 2
6•
7
u
cJ
-1
♦J
n
U
n
LJ
n
lJ
U
n
n
r1
4930011GINT12149300101.GPJ DBTemplate/LlbTemplate.GEOENGINEERS8.GDT/GEI8_GEOTECH STANDARD
Elevation (feet)
- 40� 12 22
Recovered (in)
FIELD DATA
a
E
o
d
3 0
2
U
m U
E
Z
F
Water Level
MATERIAL
DESCRIPTION
e
� c
y C
iU
REMARKS
- as� 18 so
50-1 18 73
13A
13B
14
15
SAND Sandstone: white; visually fresh; fine grained
STONE - (Puget Group Tiger Mountain formation)
Note: See Figure A-1 for explanation of symbols.
Log of Boring B-1 (continued)
G EO N G I N E S RS E ri,
Project:
Project Location:
Project Number:
Green River Bank Design and Permitting
Tukwila, Washington
21493-001-01
Figure A-2
Sheet 2 of 2
Start End
Drilled 4/23/2015 4/23/2015
Total 36.5
Depth (ft)
Logged BfAW/SST
Checked By LJS
®riper Holocene Drilling Inc.
Drilling Hollow Stem Auger
Method
Surface Elevation (ft) 28
Vertical Datum NAVD88
Hammer
Data 140 (Ibs) / 30 (in) Drop
Drilling Diedrich D50 Truck Rig
Equipment
Easting (X)
Northing (Y)
System
Datum
Groundwater
Depth to
Date Measured Water (ftl Elevation (ftl
Notes:
See Remarks
( i i 1 i l 1 i l 1 l l l i Li
i 1
s ° s 'o 's �o `'s Elevation (feet)
cWi+ o cNi� o <„ o o, o Depth (feet)
FIELD DATA
Graphic Log
Group
Classification
Fines
Content (% )
Interval
Recovered (in)
o
o
m
Collected Sample
Sample Name
Testing
Water Level
MATERIAL15
DESCRIPTION
„S
NE
i U
REMARKS
12
3
AC
\2 inches asphalt concrete walkway
J
J62
0
0
4
2
3A
SM
- Brown silty fine to medium sand (very loose,
moist) (alluvium)
-
1 12
18
1 18
118
I 12
18
6
4
10
10
12
2
%F
5
6
SA
8A
SM
Brown Silty fine to medium sand (loose, moist)
(alluvium)
—
-
Grades to wet
_ Grades to medium dense with trace organic
matter (small roots)
= =
— —
33
33
43
47
Groundwater observed at 12 feet at time of
drilling
I
aa
Mc
ML
_ Light gray silt with trace horizontally oriented
organic matter (fine fibrous wood fragments)
- (soft, moist) (alluvium) -
60
ill 12
118
23
9
10
SP-SM
_ Gray fine to coarse sand with silt (medium dense, _
wet) (alluvium)
=
26
10
Driller indicated different drilling
J18
37
11
SAND
STONE
Sandstone: white, visuallyfresh, finegrained
— (Puget Group Tiger Mountain formation) —
conditions at
approximately 34 feet
Note: See Figure A-1 for explanation of symbols.
Log of Boring B-2
GEOENGINEERS„g
Project:
Project Location:
Project Number:
Green River Bank Design and Permitting
Tukwila, Washington
21493-001-01
Figure A-3
Sheet 1 of 1
L L
C11 CA C L C J ` Li 4 l i L I
21943-001-00 SST:LJS 04-28-2015
ti-V 321f10IA
Sl1fS321 SISK1VNV 3A3IS
PERCENT PASSING BY WEIGHT
100
90
80
70
60
50
40
30
20
10
0
U.S. STANDARD SIEVE SIZE
3 ' 1.5" 3/4" 3/8" #4 # 10 #20 #40 #60 #100 #200
1000
100
4 �
10
1
GRAIN SIZE IN MILLIMETERS
01
0.01
0.001
BOULDERS
COBBLES
GRAVEL
SAND
COARSE
FINE
COARSE
MEDIUM
FINE
SILT OR CLAY
SYMBOL
EXPLORATION
NUMBER
DEPTH
(ft)
USCS SOIL CLASSIFICATION
B-2
B-1
17.5
10
Gray silty sand (SM)
Brown silty sand (SM)
•
APPENDIX B
Permit Level Design Drawings
1
1
1
1
3
3
3
j
P:\21\21493001\00\CAD\21493001-01 DESIGN SHEETs.owc\TA6::COVER SHEET MODIFIED BY TMICHAUD ON JUN II, 2015 - 8.59
5133rd St
4
S
<445
FOSTER Pe r
�371h St
i
t V°Jm P
v 6
S 140th 5t5 140th St
it
Showalter Meddle
School
rl
Foster Nigh School
S 144th St
5t
S 160th St
S 146th 5t
0
5 150th St
Soutryn
5 156th St
4
4
5 164th 5t
5 166th St
e
>+°. s' en.
h�
�P R
aS
y 4' S 139th St
00
#
Crystal Springs
Park
N 3
n:'
VICINITY MAP
Foster Goff links
4 �9i A Nf
D 4
S 144th St
4
a 0 D
S 147th 5t
4
Y N 4
0th 51
S152nd St
sew.
LD SCHNIEDER
GREEN RIVER BANK REPAIR
TUKWILA, WASHINGTON
BLACK RIVER
5 143,a 5t
JUNCTION
5 144, d Pl
e 749th 5
5 130th St
S Langston Rd S Langston Rd
S 132ntyst s t31n0St
S 133rd 5t
Black River Quarry
PROJECT
SITE
P4,
Ton Oent Park
rt
S 153rd St
5 •
4, Tukwila Park
S
Tukwila
•
Southrenter Mall
SCALE: 1"=100
Tukwila Pk
45
D i
a
i p
C F
4 ral\
4
Baker Blvd
5trander Blvd
Treck Dr
GRAPHIC SCALE
1000
1000
FEET
a
a
4'S
5 132nd St 5 132n
5 134th St
S 13St11 Sr
CD
♦
Black River Riparian
Forest and Wetland
v s5
SW 16th St
SW 27u14.
0
D
5
O
SHEET INDEX:
VICINITY MAP AND SITE MAP
2 NOTES AND SPECIFICATIONS
$ SITE PLAN
4 CROSS —SECTIONS
5 DETAILS
SITE MAP
SCALE: 1 "=400'
GRAPHIC SCALE
400
400
FEET
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV Description
Dote By Chk R
DESIGNED _ LJS ___
DATE 05/27 15
DRAWN
TJM
11
CHECKED JMA
FILE NO. 21493-001 —01
j SCALE AS NOTED III REVISED: 00/00/00
�pSEPI/ S,T
GEOENGINEERS_..0
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
VICINITY MAP AND SITE MAP
SHEET
1
GENERAL NOTES:
1. THESE DESIGNS AND DRAWINGS HAVE BEEN PREPARED FOR THE EXCLUSIVE USE OF LD SCNEIDER, AND
THEIR AUTHORIZED AGENTS. NO OTHER PARTY CAN RELY ON THE PRODUCT OF OUR SERVICES UNLESS
GEOENGINEERS INC. (GEOENGINEERS) AGREES IN WRITING IN ADVANCE OF SUCH USE.
2.
3.
THE DRAWINGS CONTAINED WITHIN SHOULD NOT BE APPLIED FOR ANY PURPOSE OR PROJECT EXCEPT
THE ONE SPECIFIED.
THESE DESIGNS AND DRAWINGS ARE COPYRIGHTED BY GEOENGINEERS, INC. ANY USE, ALTERATION,
DELETION, OR EDITING OF THIS DOCUMENT WITHOUT EXPLICIT WRITTEN PERMISSION FROM GEOENGINEERS
IS STRICTLY PROHIBITED. ANY OTHER UNAUTHORIZED USE OF THIS DOCUMENT IS PROHIBITED.
4. THE CONTRACTOR SHALL CONSTRUCT THE PROJECT IN ACCORDANCE WITH THE PLANS STAMPED
"APPROVED FOR CONSTRUCTION" THESE PLANS WILL BE PROVIDED TO THE CONTRACTOR BY THE
ENGINEER OR PROJECT INSPECTOR PRIOR TO CONSTRUCTION. WORK SHALL NOT BE INITIATED WITHOUT
THE PLANS APPROVED FOR CONSTRUCTION.
5. THE DESIGNS DEPICTED HEREIN ARE APPROXIMATE AND ARE INTENDED TO EXPRESS THE OVERALL DESIGN
INTENT OF THE PROJECT. THESE DESIGNS MAY NEED TO BE ADJUSTED IN THE FIELD DURING
CONSTRUCTION IN ORDER TO MEET THE SPECIFIC SITE CONDITIONS AND INTENDED FUNCTION. THESE
RIVER IMPROVEMENTS HAVE BEEN DEVELOPED WITH THE UNDERSTANDING THAT A QUALIFIED
GEOENGINEERS ENGINEER AND/OR SCIENTIST BE ON -SITE TO PROVIDE CONSTRUCTION GUIDANCE WHILE
THE PROJECT IS CONSTRUCTED.
6. CONDITIONS CAN CHANGE AND THESE DESIGNS ARE BASED ON CONDITIONS THAT EXISTED AT THE TIME
THE DESIGN WAS PERFORMED. THE RESULTS OF THESE DESIGNS MAY BE AFFECTED BY THE PASSAGE
OF TIME, BY MANMADE EVENTS SUCH AS CONSTRUCTION ON OR ADJACENT TO THE SITE, OR BY NATURAL
EVENTS SUCH AS FLOODS, EARTHQUAKES, SLOPE INSTABILITY OR GROUNDWATER FLUCTUATIONS. ALWAYS
CONTACT GEOENGINEERS BEFORE APPLYING THESE DESIGNS TO DETERMINE IF THEY REMAIN APPLICABLE.
7. THESE PLANS AND ELECTRONIC DRAWINGS ARE BASED ON WASHINGTON STATE PLANE NORTH
COORDINATES US FEET AND A NORTH AMERICAN VERTICAL DATUM OF 1988 US FEET. ELEVATIONS AND
NORTHINGS AND EASTINGS WITHIN THIS PLANSET ARE BASED ON THESE DATUMS.
CONSTRUCTION NOTES:
1. CONTRACTORS WORKING WITHIN THE PROJECT BOUNDARIES ARE RESPONSIBLE FOR COMPLIANCE WITH ALL
APPLICABLE SAFETY LAWS. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL BARRICADES, SAFETY
DEVICES AND CONTROL OF TRAFFIC WITHIN AND AROUND THE CONSTRUCTION AREA.
2. MATERIAL AND WORKMANSHIP FURNISHED ON OR FOR THE PROJECT MUST MEET THE MINIMUM
REQUIREMENTS OF PROJECT PERMITS, APPROVING AGENCIES, SPECIFICATIONS AS SET FORTH HEREIN, OR
WHICHEVER IS MORE RESTRICTIVE.
3. THE CONTRACTOR SHALL INSTALL AND MAINTAIN APPROPRIATE SEDIMENT CONTROL DEVICES THROUGHOUT
THE WHOLE PROJECT SITE, INCLUDING THE CONSTRUCTION STAGING AREA AND STOCKPILE AREA
THROUGHOUT THE PROJECT'S CONSTRUCTION. TEMPORARY CONSTRUCTION AND PERMANENT EROSION
CONTROL MEASURES SHALL BE DESIGNED, CONSTRUCTED AND MAINTAINED IN ACCORDANCE WITH
APPLICABLE LOCAL, STATE AND FEDERAL REGULATIONS.
4. CONSTRUCTION SHALL OCCUR DURING THE APPROVED WDFW FISH WINDOW FOR THE PROJECT AREA.
5. DISCHARGES ENTERING ACTIVE STREAMS ON -SITE SHALL SATISFY ALL STATE AND FEDERAL STANDARDS
AND PROJECT PERMIT REQUIREMENTS FOR CONTAMINANTS AND TURBIDITY.
SPECIFICATIONS:
A. REFERENCED SPECIFICATIONS ARE FROM THE 2014 VERSION OF THE WSDOT STANDARD SPECIFICATIONS
FOR ROAD, BRIDGE, AND MUNICIPAL CONSTRUCTION.
MATERIALS:
A.
1.
2.
B.
1.
RIVERBANK FILL
RIVERBANK FILL SHALL CONSIST OF WELL GRADED SAND AND GRAVEL CONFORMING TO EITHER WSDOT
STANDARD SPECIFICATION 9-03.10 "AGGREGATE FOR GRAVEL BASE", 9-03.12(2) "GRAVEL BACKFILL FOR
WALLS", 9-03.13(1) "GRAVEL BORROW", 9-03.13(2) "SELECT BORROW", OR OTHER MATERIALS AS
APPROVED BY THE GEOTECHNICAL ENGINEER. NATIVE ALLUVIUM FROM THE EXISTING RIVERBANK MAY BE
INCORPORATED INTO THE RIVERBANK FILL PROVIDED THAT THE ALLUVIUM CONTAINS LESS THAN 30
PERCENT FINES (MATERIAL PASSING THE NO. 200 SIEVE) BY WEIGHT OR AS APPROVED BY THE
GEOTECHNICAL ENGINEER.
RIVERBANK FILL SHALL BE FREE OF ORGANICS OR OTHER DELETERIOUS MATERIALS.
DRAINAGE ROCK
DRAINAGE ROCK SHALL MEET WSDOT STANDARD SPECIFICATION 9-03.12(2) "GRAVEL BACKFILL FOR
WALLS."
C. DRAIN PIPE
1. DRAIN PIPE SHALL CONSIST OF 4-INCH SCHEDULE 40 PVC PIPE. THE PIPE SHALL BE SOLID OR
PERFORATED AS INDICATED ON THE PROJECT PLANS. THE PIPE AND CONNECTIONS SHALL MEET AASHTO
SPECIFICATION M 278. PIPE CONNECTIONS AND DETAILING SHALL BE IN ACCORDANCE WITH THE
MANUFACTURER'S RECOMMENDATIONS.
2. PERFORATED DRAIN PIPE INSTALLED PARALLEL TO THE SLOPE AND SHALL CONNECT TO SOLID DRAIN
D.
1.
PIPES (OUTLET DRAINS) THAT DAYLIGHT TO THE SLOPE FACE. SOLID DRAIN PIPES SHALL BE SPACED NO
MORE THAN 20 FEET APART. SOLID DRAIN PIPES SHALL DISCHARGE ON AN EROSION PROTECTION PAD
OR EXTEND TO THE BASE OF THE EXISTING SLOPE. EROSION PROTECTION PADS SHALL BE
CONSTRUCTED OF MATERIAL CONFORMING TO WSDOT STANDARD SPECIFICATION 9-03.9(2) "PERMEABLE
BALLAST'. THE EROSION PROTECTION PADS SHALL BE FIELD FIT BY THE ENGINEER AT THE DISCHARGE
LOCATIONS AND SHALL HAVE A MINIMUM THICKNESS OF 6-INCHES, MINIMUM LENGTH (PARALLEL TO
SLOPE) OF 2 FEET, AND MINIMUM WIDTH (PERPENDICULAR TO SLOPE) OF 1 FOOT.
NON -WOVEN GEO-TEXTILE
NON -WOVEN GEO-TEXTILE SHALL MEET WSDOT STANDARD SPECIFICATION 9-33.1 "GEOSYNTHETIC
MATERIAL REQUIREMENTS" FOR NON -WOVEN GEO-TEXTILES USED FOR SEPARATION.
E. RECYCLED MATERIAL
1. RECYCLED MATERIAL SHALL NOT BE USED IN AGGREGATES OR FILL.
F.
1.
TOPSOIL
TOPSOIL SHALL CONSIST OF A COMMERCIALLY AVAILABLE 3-WAY MIXTURE CONSISTING OF LOAM SOIL,
ORGANICS AND COMPOST PASSING )6-INCH SIEVE.
G. EROSION CONTROL BLANKET AND STRAW WATTLES
1. EROSION CONTROL BLANKET SHALL COMPLY WITH WSDOT STANDARD SPECIFICATION 9-14.5(2)D
"BIODEGRADABLE EROSION CONTROL BLANKET FOR DITCHES. THE EROSION CONTROL BLANKET SHALL BE
100-PERCENT BIODEGRADABLE COIR WITHOUT MESH BACKING. THE EROSION CONTROL BLANKET SHALL
BE APPROVED BY GEOENGINEERS PRIOR TO INSTALLATION.
2. STRAW WATTLE OR SIMILAR SHALL BE 100% BIODEGRADABLE. STRAW WATTLES SHALL BE APPROVED BY
GEOENGINEERS PRIOR TO INSTALLATION.
EXECUTION:
A. SUBGRADE PREPARATION
1. SUBGRADES SHALL BE CLEARED AND GRUBBED. REMOVE BRUSH, SOD, OR OTHER ORGANIC OR
DELETERIOUS MATERIALS PRIOR TO THE PLACEMENT OF FILL. SOFT AREAS SHALL BE OVEREXCAVATED
AND REPLACED, AS DIRECTED BY GEOTECHNICAL ENGINEER.
2. SUBGRADE SHALL BE APPROVED BY GEOTECHNICAL ENGINEER. SUBGRADE SOILS SHALL BE COMPACTED
TO A FIRM AND UNYIELDING CONDITION BEFORE CONSTRUCTION PROCEEDS. SUBGRADE MATERIALS NOT
MEETING GEOTECHNICAL ENGINEER'S APPROVAL SHALL BE REMOVED AND REPLACED WITH RIVERBANK FILL
AT DIRECTION OF GEOTECHNICAL ENGINEER.
3. OVEREXCAVATED AREAS SHALL BE REPLACED WITH COMPACTED RIVERBANK FILL MATERIAL.
B. SLOPE PREPARATION
1. EXISTING SLOPES SHALL BE RE -GRADED AS REQUIRED TO INSTALL SPECIFIED IMPROVEMENT AND TO
MAINTAIN A SAFE WORK ZONE. THE CONTRACTOR IS RESPONSIBLE FOR MAINTAINING A SAFE WORK ZONE
AND COMPLYING WITH THE PROVISIONS OF TITLE 296 WASHINGTON ADMINISTRATIVE CODE (WAC), PART N,
"EXCAVATION, TRENCHING AND SHORING."
2. FILL PLACED ON OR ADJACENT TO SLOPES SHALL BE PLACED ON HORIZONTAL BENCHES CUT INTO THE
EXISTING SLOPE.
3. BENCHES SHALL EXTEND A MINIMUM OF 2-FEET HORIZONTALLY INTO THE SLOPE AND MAY BE CUT IN
STAGES AS THE FILL PROGRESSES.
C. FILL PLACEMENT AND COMPACTION
1. FILL MATERIAL SHALL BE PLACED IN LOOSE LIFTS NOT EXCEEDING 12-INCHES AND COMPACTED USING
EQUIPMENT DESIGNED FOR SOIL COMPACTION.
2. FILL SHALL BE UNIFORMLY COMPACTED TO A MINIMUM 90 PERCENT OF MAXIMUM DRY DENSITY (MDD) AS
DETERMINED BY ASTM D-1557.
D. SITE REVEGETATION
1. TOPSOIL SHALL BE LOOSELY PLACED ABOVE THE RIVERBANK FILL TO A DEPTH OF 12 INCHES. THE
FINISH GRADE SHALL BE TAMPED FIRM AND PROTECTED FROM EROSION.
2. THE EROSION CONTROL BLANKET SHALL BE SHINGLED OR PLACED IN A MANNER SUCH THAT RIVER
FLOWS AND WIND DO NOT PEEL UP THE FABRIC. THE EROSION CONTROL FABRIC SHALL BE ANCHORED
FOLLOWING THE MANUFACTURER'S INSTRUCTION.
3. NATIVE PLANTS, IDENTIFIED IN THE PLANT SCHEDULE, SHALL BE INSTALLED FOLLOWING THE LAYOUT
PROVIDED BY THE GEOENGINEERS BIOLOGIST. PLANTS SHALL BE INSTALLED THROUGH THE EROSION
CONTROL FABRIC BY CUTTING THE FABRIC TO THE MINIMUM NECESSARY TO INSTALL THE PLANTS.
E. SITE MAINTENANCE AND MONITORING
1. THE SITE WILL BE MAINTAINED BY THE OWNER INTO PERPETUITY AND IN COMPLIANCE WITH THE
PROJECT PERMITS.
2. THE SITE WILL BE MONITORED FOR A PERIOD OF FIVE YEARS FOLLOWING PLANT INSTALLATION AS
SPECIFIED IN THE DESIGN AND ANALYSIS REPORT BY GEOENGINEERS OR AS REQUIRED BY THE PROJECT
PERMITS.
ANTICIPATED MATERIAL SCHEDULE
APPROXIMATELY 420 YD3 OF CUT AND FILL:
• -160 YD3 OF NATIVE MATERIAL TO REMAIN ON SITE.
• -160 YD3 OF IMPORTED RIVERBANK FILL.
• -96 YD3 OF IMPORTED TOPSOIL.
• -3 YD3 OF 1-INCH DRAIN ROCK.
• -1 YD3 OF IMPORTED OUTFALL PROTECTION.
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
Description
REVISION PER AGENCY COMMENTS
Date By
Chk
Rev
DESIGNED LJS
7-22-15 ,TJM
TAB
WS
1 DRAWN
TJM
DATE 05/27/15
FILE NO. 2�493-001-01
CHECKED JMA
SCALE AS NOTED
REVISED: 07/22/15
GEOENGINEERS
600 Stewart Street, Suite 1700 P: 206-728-2674
Seattle, WA 98101 F: 206-728-2732
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
NOTES AND SPECIFICATIONS
SHEET
2
fl
J
J
n
L
n
.J
n
LJ
n
r�
.J
LJ
•
-II
LJ
,I
U
L...J
P:\21\21493001\00\CAD\21493001-01 DESIGN SHEETS.DWG\TAB:PLAN VIEW MODIFIED BY TMICHAUD
O
}
\\
OHWM
OHWM
ASPHALT
TRAIL
100' WIDE TYPOS RIVER BUFFER &
URBAN CONSERVANCY BUFFER
COMMERCIAL BuILOING
LEGEND
B-14- BORING LOCATIONS.
—?S EXISTING CONTOURS
PROPOSED BANK LINES
OHWM
ORDINARY HIGH WATER MARK
LIMITS OF WORK
SILT FENCE
\\
BORING LOGS PROVIDED IN ACCOMPANYING REPORT (GEOENGINEERS 2015)
VERTICAL DATUM: NAVD88
OHWM
O
STONE BENCH
OHWM
GREEN RIVER
OHWM
EL=10.0'
OHWM
OHWM
a:
0b_rk-
v
OHWM
OHWM
STONE BENCH
24" SYCAMORE
34 SYCAMORE
PLAN VIEW
SCALE: 1"=10'
SCALE
FEET
OUTLET DRAIN
(TYP.)
OHWM
x
BOTTOM OF FILL SLOPE r- SILT FENCE
OHWM
x O x zOMNM
PARK
\NG LOT
30" SYCAMORE
OHWM
OH'NM
0
15 —
2 _
TOP OF
EXISTING SLOPE
ONWM
24" SYCAMORE
41" SYCAMORE
PROTECT TREES PER
CITY REQUIREMENTS
(TYP.)
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV
Description
Dote
By
Chk
Rev
DESIGNED WS
DRAWN TJM
DATE 05/27/15
FILE NO. 21493-001-01
CHECKED JMA
SCALE AS NOTED
REVISED: 00/00/00
GEOENGINEERS_.0
600 Stewart Street, Suite 1700 P: 206-728-2674
Seattle, WA 98101 E: 206-728-2732
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
SITE PLAN
SHEET
3
J
P:\21\21493001\00\CAD\21493001-01 DESIGN SHEETS.DWG\TAB:SECTIONS MODIFIED BY 'ammo ON JUL 22, 2015 - 1
5
SCALE
0 5
FEET
30
24" SYCAMORE
(PROTECT TREE PER
GEOENGINEERS)
I---- PARKING LOT
20 —
10 —
1
-------------------
LANDWARD LIMITS OR WORK
1 EXISTING
1 H ASA
TRAILPHLT
SEE ANCHOR TRENCH DETAIL
CUT AS REQUIRED FOR SAFETY AND STABILITY
TOP SOIL ,— EXISTING GRADE
25
RIVERBANK FILL
NATIVE VEGETATION (TYP.)
EROSION CONTROL FABRIC
OUTFALL PROTECTION PER
MATERIAL NOTE C-2
BASE FLOOD
SEE DRAIN DETAIL J OUTLET DRAIN —
SEE ANCHOR TRENCH DETAIL
40' TRAIL EASEMENT (APPROXIMATE)
— 30
ELEVATION
—20
SILT FENCE
(WATERWARD LIMITS
OF WORK)
OHWM
0 10 20 30
30
30" SYCAMORE
(PROTECT TREE PER
GEOENGINEERS)
PARKING LOT
-----------------
20 —
10 -
0
SECTION
40
Distance (Feet)
50
60
A
HORIZONTAL SCALE: 1"=5'
VERTICAL SCALE 1"=5'
LANDWARD LIMITS OR WORK
1
SEE ANCHOR TRENCH DETAIL
EXISTING
ASPHALT
TRAIL
CUT AS REQUIRED FOR SAFETY AND STABILITY
SEE DRAIN DETAIL
C-2
NATIVE VEGETATION (TYP.)
EXISTING GRADE
TOP SOIL
70 80
30
RIVERBANK FILL —
EROSION CONTROL FABRIC —
BASE FLOOD ELEVATION
— • — - — - — - — - — - — - — - — - — - — 20
OUTFALL PROTECTION PER
2.5 MATERIAL NOTE C-2
11
SILT FENCE
2q+{� (WATERWARD LIMITS _
OF WORK)
SEE ANCHOR TRENCH DETAIL
40' TRAIL EASEMENT (APPROXIMATE)
OHWM
10 20
SECTION
30
40
Distance (Feet)
50
B
HORIZONTAL SCALE: 1' 5'
VERTICAL SCALE 1" 6
C-2
60
70 80
10
0
10
0
85
.15
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV Description
Date
By
Chk
Rev
REVISION PER AGENCY COMMENTS
7-22-15
TJM
TAB
LJS
DESIGNED LJS
DRAWN TJM
DATE 05/27/15
FILE NO. 21493-001-01
CHECKED JMA
SCALE AS NOTED
REVISED: 07/22/15
GEOENGINEER_
600 Stewart Street, Su'te 1700 P: 206-728-2674
Seattle, WA 98101 F: 206-728-2732
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
CROSS -SECTIONS AND DRAIN DETAIL
SHEET
4
P:\21\21493001\00\CAD\21493001-01 DESIGN SHEETS.DWG\TAB:DETAILS MODIFIED BY TMICHAUD ON JUL 21, 2015 -
4" SCH40 PERFORATED
PVC DRAIN PIPE
EL. 15.0'
RIVERBANK FILL
12"
DRAIN DETAIL
NON -WOVEN GEOTEXTILE
SOLID SCH40 PVC
OUTLET DRAIN
2%
NATIVE SOIL
NOT TO SCALE
A\
JOINTS IN FILTER FABRIC SHALL BE SPLICED
AT POSTS. USE STAPLES, WIRE RINGS, OR
EQUIVALENT TO ATTACH FABRIC TO POSTS.
T -- ..lJl�t1�11T
6' MAX.
LJ
POST SPACING MAY BE INCREASED
TO 8' IF WIRE BACKING IS USED
NOTE: FILTER FABRIC FENCES SHALL BE
INSTALLED ALONG CONTOUR WHENEVER POSSIBLE
Recommended Planting Schedule
Estimated Common Name Scientific Name Size Spacing
Quantity
12 Black cottonwood Populus balsamifera 6 - 8 feet in height 10 feet o.c.
14 Western red cedar Thuja plicata 6 - 8 feet in height 10 feet o.c.
12 Big leaf maple Acer macrophyllum 6 - 8 feet in height 10 feet o.c.
12 Pacific dogwood Corpus nutalli 6 - 8 feet in height 10 feet o.c.
40 Vine maple Acer clrcinatum 6 - 8 feet in height 5 feet o.c.
40 Oceanspray Holodiscus discolor 24-inch in height 5 feet o.c
40 Snowberry Symphoricarpos albus 24-inch in height 5 feet o.c
40 Western serviceberry Amelanchier alnifolia 24-inch in height 5 feet o.c
40 Red osier dogwood Cornus sericea 24-inch in height 5 feet o.c
PLANT SCHEDULE
2"x2" BY 14 Ga. WIRE OR
EQUIVALENT, IF STANDARD
STRENGTH FABRIC USED
FILTER FABRIC
MINIMUM 4"x4" TRENCH
BACKFILL TRENCH WITH
NATIVE SOIL OR 3/4"-1.5"
WASHED GRAVEL
2"z4" WOOD POSTS, STEEL FENCE
POSTS, REBAR, OR EQUIVALENT
SILT FENCE DETAIL
NOT TO SCALE
vai
EXCESS SOCK
MATERIAL, DRAWN
IN AND TIED OFF
AT STAKE (TYP.)
DISTURBED
AREA
PLAN VIEW
10' (MAX)
DISTURBED
AREA
PROTECTED
AREA
SECTION
(SHOWN AS SLOPE PROTECTION)
10' - 0" ® 30" ANGLE EACH
END TO PREVENT FLOW
AROUND (TYP.)
2"X2" X 3'
WOODEN STAKE
COMPOST SOCK
SEE NOTE 1
CONTOUR LINE (TYP.)
2"X 2"X 3' WOODEN STAKE,
SPACED EVERY 3' O.C. (TYP.)
DETAIL
NOTES:
1. COMPOST SOCK SHALL BE IN ACCORDANCE
WITH STANDARD SPECIFICATION 9.14.4(9).
COMPOST SOCK SHALL BE A MINIMUM OF 10"
IN DIAMETER OR SIZED TO SUIT CONDITIONS
AS SPECIFIED BY THE ENGINEER.
2. ALWAYS INSTALL COMPOST SOCK
PERPENDICULAR TO SLOPE AND ALONG
CONTOUR LINES.
3. REMOVE SEDIMENT FROM THE UP SLOPE SIDE
OF THE COMPOST SOCK WHEN ACCUMULATION
HAS REACHED 1/2 OF THE EFFECTIVE HEIGHT
OF THE COMPOST SOCK.
4. MAY BE USED IN PLACE OF FILTER FENCE
FOR PERIMETER CONTROL.
STRAW WATTLE DETAIL
NOT TO SCALE
EROSION CONTROL FABRIC
LOOSEN AND/OR CUT CIRCLING ROOTS
IN ROOT BOUND CONTAINERS BEFORE
PLANTING
BREAK UP SIDES AND BOTTOMS
OF PLANTING PIT TO ALLOW
FOR ROOT PENETRATION
COMPACT SUBGRADE
BELOW ROOT BALL
TYPICAL PLANTING DETAIL
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV
Description
Date
Q REVISION PER AGENCY COMMENTS
By Chk
7-22-15 TJM TAB
Rev
US
DESIGNED US
DRAWN TJM
DATE 05/27/15
FILE NO. 21493-001-01
CHECKED JMA
SCALE AS NOTED
REVISED: 07/22/15
GEOENGINEERZ
600 Stewart Street, Suite 1700 P: 206-728-2674
Seottle, WA 98101 F: 206-728-2732
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
DETAILS
SHEET
5
APPENDIX C
Project Value Documentation
• J
L J
LJ
J
'1
J
J
1
J
�J
LB Schneider Green River Bank Repair - Project Value Documentation
14900 Interurban Avenue South
Tukwila, Washington
Description
Description of Quantity
QTY per
foot of
repair
Unit
Unit Cost
(Total +
0&P)
Total for
Foot of
Repair
Project Total
Based on 160
Feet of Repair
Excavation and Haul
Riverbank Excavation Including Haul & Disposal
Bid Tab 1060 From B&D Levee Project
0
CY
_ $17.00
$0.00_
$0.00
Subtotal
Subsurface Drainage
Fabric Laid in Trench
RS Means
1.3
SY
$2.42
$3.15
$503.36
Drainage Material
RS Means
0.22
CY
$34.00
$7.48
$1,196.80
6-in PVC Perforated
RS Means
2
LF
$14.45
$28.90
$4,624.00
Rock for Erosion & Scour Protection (Class A)
Bid Tab 1326 B&D Levee
0.126
TON
$48.00
$6.05
$967.68
Subtotal
$42.43
$6,788.48
Foundation Preparation
Foundation Excavation Including Haul & Disposal
Bid Tab 1060 From B&D Levee Project
0
CY
$17.00
$0.00
$0.00
Rock for Erosion & Scour Protection (Class A)
Bid Tab 1326 B&D Levee
0
TON
$48.00
$0.00
$0.00
Subtotal
$0.00
$0.00
Fill Placement and Compaction
Gravel Borrow Including Haul and Compaction
Bid Tab 1075 from B&D Levee Project
5.53
TON
$20.00
$110.60
$17,696.00
Geo-Grid Soil Reinforcement
RS Means
0
SF
$0.81
$0.00
$0.00
Jute Mesh
Bid Tab 8025 from B&D Levee Project
0
SY
$1.30
$0.00
$0.00
Subtotal
$110.60
$17,696.00
Erosion Control, Surface Treatments, and Plantings
TESC
Tab Schedule VII B&D Levee
1
LF of River
$51.28
$51.28
$8,204.80
_Bid
Landscaping
Bid Tab Schedule VIII B&D Levee
1
LF of River
$100.00
$100.00
$16,000.00
Subtotal
$151.28
$24,204.80
Mobilization, Contingency, Misc., and Totals
Total Unit Costs
$262
$41,901
Mobilization
Assumed Values
10.0%
LS
$26
$4,190
Contingency
Assumed Values
15.0%
LS
$39
$6,285
Miscellaneous Costs
Assumed Values
10.0%
LS
$26
$4,190
Sales Tax
Washington State
9.5%
LS
$25
$3,981
Estimated Totals
$378
$60,547
APPENDIX D
Trail Easement Agreement
' -
4gr
••••
(.1.! „ • • '
'';',!;%:"1/01" :••••, •
1 ,.; •
•
. . • ir •
•
fl •
• • .
*.-1 • •
" '•
EASEMENT
•
I .
. • •.. . •
. ... . -".. . .. .
. . . . .
, .
. •
. . -
•
•
PropeSed:t-2B49 ' •
14F:#78417SMP- - •
,
THIS INSTRUMENT maden
this day of 044-,14-0111( ,1990. ., •
by.Gary A. NiIsen Sr. and L.O. Schneider (the "Grant° sw).'in favor of CITY Or. •: -
TUKWILA, a municipal corporation of King County, State pf Washington (the %ranee").
, •
. - • WITNESSETH . .
Grantees, for and in consideration of the sum of one dollar (1.00) and -other
valuable consideration, receipt of which is acknowledged, Grantors grants, :con, •
.veys., and -conf-rms to Grantee, its successors and assigns, a perpetual Mil -exclusive
easement -for public •aceeis for the purpose of constructing and operating'a recreational
trail open to the public, and related construction and improvements, across and
upon the property described on the attached "Exhibit A" and further shown on the map
attached as "Exhibit B".
Grantee shall have the right without prior institution of suit or proceeding at
law, at such time as may be deemed appropriate by Grantee. to enter upon said
property for the purpose of operating, maintaining, repairing, replacing.or re- •
-1 constructing a public. recreational trail and related improvements, without incur- .
ring legal obligations or liability therefor; provided, said operating, -Maintain-
ing, repairing, replacing, or reconstructing of a.public recreational trail or
related improvements shall be accomplished in such a manner that private improve-
ments shell not be disturbed or destroyed. and Grantors shall not be excluded from ,
such -easement property and shall have unlimited right to use said easement property
for any lawful purposes not inconiistant with the rights of grantee. In the event
they are disturbed or destroyed, they will be replaced in as good a condition. .
as,they.were immediately before the property was entered upon by Grantee.
This .shall be a covenant running with the land forever and shall be binding on
Grantors successors; heirs and assigns.
9-1
'
71 •
By:
1% EXCISE TAX NOT REQUIRED
Xing Co flecordz:
. .
•• . "Da.ec. -,A7
• C)
co
EXHIi3TT A
Thelpede'strian access easement as, described in the easement agreement shall:be;:
from the ordinary•h•i•gh water mark to a point 40 feet west of said'ordinary high '
•.water'mark over.'all of the •following parcels, of land: '•
LEGAL. DESCRIPTIONS:
•
That portion of Tract.1, interurban Addition to Seattle, according to the
plat.recorded in Volume 10 ornate, page 55, records of King County,
Washington, lying southerly of a line which extends northeasterly,•perpen-
dicular with the westerly line of said tract, from a point•on said westerly.'
line which is 685 feet southeasterly from the northwest corner of. said
'tract; and lying northerly of a line which extends northeasterly, perpen-
dicular with the westerly line of said tract, from a point on said westerly
line'which is 1555 feet southeasterly from the northwest corner.of said
tract;'ALSO that portion of the vacated Puget Sound Electric Railway R/W
adjoining'thereto lying southeasterly of S. 149th St. as conveyed by
Puget•Sound Power and Light Co. to the City of Tukwila by deed dated
October 25, 1965 and filed under Auditor's File No. 6557639; and Lying
northwesterly of a line which extends southwesterly, perpendicular with
the easterly line of said P.'S. E. R/W, which is also the westerly line
of said Tract 1, lnterurban Addition, from a point on said westerly'line
which is 1555 feet southeasterly from the northwest corner of said tract.
�3�wRFW�i•14�ON7.'itX)-
r•
1
r'
r
•
r•
1.
• .•;:y :
•-• • -
• ff,.,1
„qt. • „ •
14
• .
• %
-
• , .
*•!••••,. • • , • ,
. .
• r
' -t-iTAtE OFAASHINGTON)
.') st.
- • ' COUNTY OF KING - )
•;: ' • • .* .; :
•
'•••••••,14•4:,-.4,-.••;14.••:;••••••i!•:;•.1.(,••044-to,v,....„4;,.,g, j..„
. . ',. . .-. On this itlk- day Of am..../.."—e....A..A4 / 1 /leg -Ism beforeme personally
,--+cl* -,.• . . appeared _.;i7 A, ,,,..c...,,/,,..„_,___ALIA_
• e•-• ; ' ' • •
'• - — and. • • ' e.-- 4- AA ./. .
r1 • ,... ... j..4,-,-,7 ,1"......L.p...-- , -
. ' to. Me known a be thie• i'l•_,;. -‘_.•-•t-k•—•9 -, -
1. 7, • ., of- 4.-1.--y....A...... 1.2—A._ — A), ..9_,,,..91z.....--y•y0
. . 7
;:-.5.7 .
i t n
r A — .,the•individuals that executed the foregoing instrument, nd acknowledged the' said
. • >•instrument to be the free and voluntary act and deed of said individuals fp;:the
LI • • . _uses and purposes mentioned therein, and on oath stated that they were authorized
-1 to execute the'said instrument.
L_J '
71 ,
fl'
r
,;."01,..',13,1* • r
(
NOTARY PUBLI in and fgf then.S4te of Wash-
ington, res • ng at
194,
-2-
•
•
• .
. - r • .
•
r.::(1v! •
•
.4 V.Arrpit .411.; 4 , " • , 4 .;,1"., % 1 6.! • V.
A iA,1 - ',• • , • •
•1!.5'440 . . J • . 14,
' • . .• ' • • ..,
• • ir r
;* ' • • - ;
•
•
• 10 411- ."!
•
CO
CO
uJ
I-1
. • ••-•••
P3
0 0
e 0
re
t •
ec
0
tu
cc,
0
no
• ;
A
• 4 .
• ti
•
•
•-•
. I I
...Urine •
I .zcirleA•
• ;•,.. ,•••••
• •,t-f• • ' •
0-• •r„e
•
4 6,,
I r.
•
•
It'
LJ
Ng:
•43,;44,.'s
•
4•!.: .
• , • .
r 1; • ••• •
• ,
• • • . • t
•
L _J
r;
fl I
fl
6-1
n.
.•
• ' • .
CO
fl•
—7
I •
• .
d• • ! - , - - • t
:,••••„.;, '
d
FILED. for Reord at eguest of
._,,•
• ......
.-.:* •." .
• •
W.•:A.,'';‘ • '-;• . .
.0 • .: •
• •••-r:C.
':• ;°.• :
•
• = a 7 .
= •
n•-•
. . •
-.. •
• ...::1!:.-T.;.-1141`41
".•;r
' . • ,
• • • •
,•
. • •
• ' -•- • ‘. cn.
• • •
• .•
!.t.•
•
• • t
f
11
eity o f .J u11wiea
Department Of Community Development
AFFIDAVIT OF DISTRIBUTION
I, Valerie Lonneman, HEREBY DECLARE THAT:
Notice of Application
Notice of Decision
Notice of Public Hearing
Notice of Public Meeting
V `,
Determination of Non-
Significance
Mitigated Determination of Non-
Significance
Determination of
Significance & Scoping
Notice
Short Subdivision Agenda
Notice of Application for
Shoreline Mgmt Permit
Shoreline Mgmt Permit
Board of Appeals Agenda
Packet
Board of Adjustment Agenda Packet
Official Notice
Notice of Action
Other:
Was mailed to each of the addresses listed/attached
on this 17 day of August, 2015
Project Name: Green River Bank Erosion Repair
Project Number: E15-0007 (SEPA)
Associated File Number (s): L15-0032 (Shoreline)
Mailing requested by: Valerie Lonneman
r
Mailer's si nature:
W:\USERS\VALERIE\AFFIDAVIT OF DISTRIBUTION.DOC
laura.murphy@muckleshoot.nsn.us, Muckleshoot Tribe
Karen.Walter@muckleshoot.nsn.us, Muckleshoot Tribe
mike.middleton@muckleshoot.nsn.us, Muckleshoot Tribe
james@duwamishcleanup.org, Duwamish Tribe
Kurn Schneider, Owner (9vt ka t�)
tannister@geoengineers.ctim, Thomas Bannister, Applicant
Larry.Fisher@dfw.wa.gov, Washington Department of Fish and Wildlife
sepaunit@ecy.wa.gov, State Department of Ecology, SEPA Division
Christie.Most@kingcounty.gov, King County Assessor
W:\USERS\VALERIE\AFFIDAVIT OF DISTRIBUTION.DOC
CITY OF TUIKWILA
Department of Community Development
6300 Southcenter Boulevard, Tukwila, WA 98188
Telephone: (206) 431-3670
AFFIDAVIT OF OWNERSHIP AND HOLD HARMLESS
PERMISSION TO ENTER PROPERTY
STATE OF WASHINGTON
COUNTY OF KING
The undersigned being duly sworn and upon oath states as follows:
1. I am the current owner of the property which is the subject of this application.
2. All statements contained in the applications have been prepared by me or my agents and are true and conect to the best of my
knowledge.
3. The application is being submitted with my knowledge and consent.
4. Owner grants the City, its employees, agents, epgineers, contractors or other representatives the right to enter upon Owner's real
property, located at i'i 11 U RZAN AVE , ''-1 for the purpose of application
review, for the limited time necessary to complete that purpose.
5. Owner agrees to hold the City harmless for any loss or damage to persons or property occurring on the private property during
the City's entry upon the property, unless the loss or damage is the result of the sole negligence of the City.
6. Non -responsiveness to a City information request for ninety (90) or more days, shall be cause to cancel the application(s)
without refund of fees.
EXECUTED at 01-a1•1 i X I (city), A Z (state), on Q u,JG , 20 /5—
KQRA
(Print Nameg) ��
3ZNcO0 Z 1 (;it' V Sf 1 ttOOX 4-z
(Address)
zze;„
(Phone Number)
2;;;/-•• C:01/
(Signature)
(kW icV't
to me known to be the individual who
executed the foregoing instrument and acknowledged that he/she signed the same as his/her voluntary act and deed for the uses and
purposes mentioned therein.
SUBSCRIBED AND SWORN TO BEFORE ME ON THIS < DAY OF J U N-e' , 20 I S
On this day personally appeared before me
LAURA TUCKER
Notary Public- State dAdzons
MARICOPA COUNTY
My Commission Expires March 31, 2010
NOTARY PUBLIC in and for the State of Washington ARf.ZL -
residing at M Ri Copy [ nuNt�
My Commission expires on MClP-Oh �l 1 2Dt%
\\Deptstore\City Common\Tcri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.Docx
C='-'.of Tukwila ESA Screening Checklist
Part A: Please review and answer each question carefully. Consider all phases of your project including, but
not limited to, construction, normal operation, potential emergency operation, and ongoing and scheduled
maintenance. Continue to the next question as directed for each No or Yes answer.
1-0
Will the project require any form of grading? Grading is defined as any excavating, filling, clearing, or
creation of impervious surface, or any combination thereof, which alters the existing ground surface of the
earth (TMC 18.06.370). Please mark the appropriate response.
NO - Continue to Question 2-0
YES - Continue to Question 1-1 (Page 3)
2-0
Will the project require any form of clearing? Clearing means the removal or causing to be removed,
through either direct or indirect actions, any vegetation from a site (18.06.145). Please mark the
appropriate response.
NO - Continue to Question 3-0
YES - Continue to Question 2-1 (Page 4)
3-0
Will the project require work, during any time of the project, below the ordinary high water mark of a
watercourse or the Green/Duwamish or Black Rivers or in wetlands? Ordinary high water mark is the mark
that is found by examining the bed and banks of a stream and ascertaining where the presence and action of
waters are so common and usual as to distinctly mark the soil from that of the abutting upland, in respect to
vegetation (see TMC Chapter 18.06, Page 18-15). Please mark the appropriate response.
NO - Continue to Question 4-0
YES - Continue to Question 3-1 (Page 5)
4-0
Will the project result in the processing or handling, storage, or treatment of hazardous substances? This
does not include the proper use of fuel stored in a vehicle's fuel tank. Hazardous substances are any liquid,
solid, gas, or sludge, including any material, substance, product, commodity, or waste, regardless of
quantity, that exhibits the characteristics or criteria of hazardous waste as defined by Washington
Administrative Code 173-303 (TMC 18.06.385). This includes fuel or other chemicals stored on -site during
construction. Please mark the appropriate response.
NO - Continue to Question 5-0
YES - Continue to Question 5-0
5-0
Will the project result in the withdrawal, injection, or interception of groundwater? Examples of projects
that may affect groundwater include, but are not limited to: construction of a new well, change in water
withdrawals from an existing well, projects involving prolonged construction dewatering, projects installing
French drains or interceptor trenches, and sewer lines. For the purpose of this analysis, projects that require
a geotechnical report pursuant to the requirements of TMC 18.45.060 or would require a geotechnical report
if not exempt should answer Yes. Please mark the appropriate response.
NO - Continue to Question 6-0
✓ YES - Continue to Question 6-0
6-0 Will the project involve landscaping or re -occurring outdoor maintenance that includes the regular use o:
fertilizers, pesticides, or herbicides? This does not include the one-time use of transplant fertilizers.
Landscaping means natural vegetation such as trees, shrubs, groundcover, and other landscape materials
arranged in a manner to produce an aesthetic effect appropriate for the use of the land (TMC 18.06.490).
For the purpose of this analysis, this includes the establishment of new lawn or grass. Please mark the
appropriate response.
NO — Checklist Complete
YES — Checklist Complete
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 2
(� \ of Tukwila ESA Screening Checklist
Part B: Please answer each quesstion below for projects that include gradi: Review each question carefully,
considering all phases of your project including, but not limited to construction, normal operation, potential
emergency operation, and ongoing and scheduled maintenance. Continue to the next question as directed for
each No or Yes answer.
1-1
Will the project involve the modification of a watercourse bank or bank of the Green/Duwamish or Black
Rivers between the ordinary high water mark and top of bank? This includes any projects that will require
grading on any slope leading to a river or stream, but will not require work below the ordinary high water
mark. Work below the ordinary high water mark is covered in Part C. Please mark the appropriate
response.
NO - Continue to Question 1-2
✓ YES - Continue to Question 1-2
1-2
Could the construction, operation, or maintenance of the project result in sediment transport off site or
increased rates of erosion and/or sedimentation in watercourses, the Green/Duwamish rivers, or the Black
River? Most projects that involve grading have the potential to result in increased erosion and/or
sedimentation as a result of disturbances to the soil or earth. If your project involves grading and you have
not prepared a Temporary Erosion and Sedimentation Control Plan specifically designed to retain 100
percent of the runoff (including during construction) from impervious surface or disturbed soils, answer Yes
to this question. If your project is normally exempt under the Tukwila Municipal Code and would not
require the preparation of a Temporary Erosion and Sedimentation Control Plan, BUT may still result in
erosion or sediment transport off site or beyond the work area, answer Yes to this question. Please mark the
appropriate response.
NO - Continue to Question 1-3
1 YES - Continue to Question 1-3
1-3
Will the project result in the construction of new impervious surfaces? Impervious surfaces include those
hard surfaces which prevent or restrict the entry of water into the soil in the manner that such water entered
the soils under natural conditions prior to development; or a hard surface area that causes water to run off the
surface in greater quantity or at an increased rate of flow from the flow presented under natural conditions
prior to development. Such areas include, but are not limited to, rooftops, asphalt or concrete paving,
compacted surfaces, or other surfaces that similarly affect the natural infiltration or runoff patterns existing
prior to development (TMC 18.06.445). Please mark the appropriate response.
NO - Continue to Question 2-0 (Page 2)
YES - Continue to Question 1-4
1-4
Will your project generate stormwater from the creation of impervious surfaces that will not be infiltrated on
site? For the purpose of this analysis, infiltration includes the use of a stormwater treatment and management
system intended to contain all stormwater on site by allowing it to seep into pervious surface or through other
means to be introduced into the ground. If your project involves the construction of impervious surface and
does not include the design of a stormwater management system specifically designed to infiltrate
stormwater, answer Yes to this question. Please mark the appropriate response.
NO - Continue to Question 2-0 (Page 2)
YES - Continue to Question 2-0 (Page 2)
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 3
/
G' of Tukwila ESA Screening Checklist
Part C: Please review each questiod below for projects that include clearing. tteview each question carefully,
considering all phases of your project including, but not limited to construction, normal operation, potential
emergency operation, and ongoing and scheduled maintenance. Continue to the next question as directed for
each No or Yes answer.
2-1 Will the project involve clearing within 200 feet of the ordinary high water mark of a watercourse or the
Green/Duwamish or Black Rivers? Please mark the appropriate response.
NO - Continue to Question 3-0 (Page 2)
✓ YES - Continue to Question 2-2
2-2 Will the project involve clearing of any trees within 200 feet of the ordinary high water mark of a watercourse
or the Green/Duwamish or Black Rivers? A tree is defined by TMC 18.06.845 as any self-supporting woody
plant, characterized by one main trunk, with a potential diameter -breast -height of 2 inches or more and
potential minimum height of 10 feet. Please mark the appropriate response.
✓ NO - Continue to Question 2-3
YES - Continue to Question 2-3
2-3 Will the project involve clearing of any evergreen trees from within 200 feet of the ordinary high water mark
of a watercourse or the Green/Duwamish or Black Rivers? For the purpose of this analysis evergreen means
any tree that does not regularly lose all its leaves or needles in the fall. Please mark the appropriate
response.
✓ NO - Continue to Question 2-4
YES - Continue to Question 2-4
2-4 Will the project involve clearing within 100 feet of the ordinary high water mark of a watercourse or the
Green/Duwamish or Black Rivers? Please mark the appropriate response.
NO - Continue to Question 3-0 (Page 2)
✓ YES - Continue to Question 2-5
2-5 Will the project involve clearing within 40 feet of the ordinary high water mark of a watercourse or the
Green/Duwamish or Black Rivers? Please mark the appropriate response.
NO - Continue to Question 3-0 (Page 2)
/ YES - Continue to Question 3-0 (Page 2)
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 4
(7' \of Tukwila ESA Screening Checklist
Part D: Please review each quesfiwr below for projects that include work b iow the ordinary high water mark of
watercourses or the Duwamish/Green or Black Rivers or in wetlands. Review each question carefully,
considering all phases of your project including, but not limited to, construction, normal operation, potential
emergency operation, and ongoing and scheduled maintenance. Continue to the next question as directed for
each No or Yes answer.
3-1
Will the project involve the direct alteration of the channel or bed of a watercourse, the Green/Duwamish
rivers, or Black River? For the purpose of this analysis, channel means the area between the ordinary high
water mark of both banks of a stream, and bed means the stream bottom substrates, typically within the
normal wetted -width of a stream. This includes both temporary and permanent modifications. Please mark
the appropriate response.
NO - Continue to Question 3-2
YES - Continue to Question 3-2
3-2
Will the project involve any physical alteration to a watercourse or wetland connected to the Green/Duwamish
River? For the purpose of this analysis, "connected to the river means" flowing into via a surface connection
or culvert, or having other physical characteristics that allow for access by salmonids. This includes impacts
to areas such as sloughs, side channels, remnant oxbows, ditches formed from channelized portions of natural
watercourses or any area that may provide off channel rearing habitat for juvenile fish from the Duwamish
River. This includes both temporary construction alterations and permanent modifications. Watercourses or
wetlands draining to the Green/Duwamish River that have a hanging culvert, culvert with a flap gate,
diversion, or any entirely man-made or artificial structure that precludes fish access should answer Yes to this
question. Please mark the appropriate response.
NO - Continue to Question 3-3
YES - Continue to Question 3-3
3-3
Will the project result in the construction of a new structure or hydraulic condition that could be a barrier to
salmonid passage within the watercourse or the Green/Duwamish or Black Rivers? For the purpose of this
analysis, a barrier means any artificial or human modified structure or hydraulic condition that inhibits the
natural upstream or downstream movement of salmonids, including both juveniles and adults. Please mark
the appropriate response.
NO - Continue to Question 3-4
YES - Continue to Question 3-4
3-4
Will the project involve a temporary or permanent change in the cross -sectional area of a watercourse or the
Green/Duwamish or Black Rivers? For the purpose of this analysis, the cross -sectional area is defined as a
profile taken from the ordinary high water mark on the right bank to the ordinary high water mark on the left
bank. Please mark the appropriate response.
NO - Continue to Question 3-5
YES - Continue to Question 3-5
3-5
Will the project require the removal of debris from within the ordinary high water mark of a watercourse or
the Green/Duwamish or Black Rivers? For the purpose of this analysis, debris includes, but is not limited to
fallen trees, logs, shrubs, rocks, piles, rip -rap, submerged metal, and broken concrete or other building
materials. Projects that would require debris removal from a watercourse or the Green/Duwamish or Black
Rivers as part of a maintenance activity should answer Yes to this question. Please mark the appropriate
response.
NO - Continue to Question 3-6
YES - Continue to Question 3-6
\\deptstore\City Common \Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 5
Part D (continued)
\ J
of Tukwila ESA Screening Checklist
3-6 Will the project result in impacts to watercourses or wetlands that have a surface connection to another
watercourse or the Green/Duwamish or Black Rivers but do not contain habitat conditions that support
salmonid use? Such areas may include, but not be limited to hillside seeps and wetlands isolated from the
watercourse or river that have a surface water connection to the watercourse or river but are not assessable,
nor would be assessable to salmonids under natural conditions. Wetlands with a "functions and values" rating
for baseflow/groundwater support of 9 and above (or moderate) as described in Cooke (1996) should be
included. Please mark the appropriate response.
NO - Continue to Question 3-7
YES - Continue to Question 3-7
3-7 Will the project include the construction of artificial waterways or wetlands connected to a watercourse
containing salmonids? For the purpose of this analysis, the construction of artificial waterways or wetlands
includes wetlands, channels, sloughs, or other habitat feature created to enhance wildlife use, particularly
waterfowl use, or may be attractive to wildlife, particularly waterfowl. Please mark the appropriate
response.
NO - Continue to Question 3-8
YES - Continue to Question 3-8
3-8 Will the project include bank stabilization? For the purpose of this analysis, bank stabilization includes, but is
not limited to, rip -rap, rock, log, soil, or vegetated revetments, concrete structures, or similar structures.
Please mark the appropriate response.
NO - Continue to Question 4-0 (Page 2)
YES - Continue to Question 4-0 (Page 2)
\\deptstore\City Common \Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 6
/
SEPA Checklist
STATE ENVIRONMENTAL POLICY ACT CHECKLIST
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
A. BACKGROUND
1. Name of proposed project, if applicable:
Green River Bank Erosion Repair
2. Name of Applicant:
LD Schneider and Associates
3. Date checklist prepared:
May 18, 2015
4. Agency requesting checklist:
City of Tukwila
5. Proposed timing or schedule (including phasing, if applicable):
Construction is schedule to begin August 1, 2015
6. Do you have any plans for future additions, expansion, or further activity related to or
connected with this proposal? If yes, explain.
No
7. List any environmental information you know about that has been prepared, or will be
prepared, directly related to this proposal.
Analysis and Design Report by GeoEngineers
8. Do you know whether applications are pending for governmental approvals of other
proposals directly affecting the property covered by your proposal? If yes, explain.
No.
Agency Comments
\\deptstore\City Common \Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2o11.docx
Page 1
SEPA Checklist ,.
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
9. List any government approvals or permits that will be needed for your proposal.
Shoreline Substantial Development permit from the City of Tukwila.
Hydraulic Project Approval (HPA) from the Washington Department of Fish and Wildlife.
10. Give brief, complete description of your proposal, including the proposed uses and the
size of the project and site. There are several questions later in this checklist that ask
you to describe certain aspects of your proposal. You do not need to repeat those
answers on this page.
The project consists of installing a subsurface gravity drainage system to transport water away
from the failure plane and rebuilding the riverbank using a combination of structural fill and
topsoil. The subsurface drainage system consists of a perforated 4-inch schedule 40 PVC pipe
that will capture subsurface water along the 165-foot length of the bank repair.
11. Location of the proposal. Give sufficient information for a person to understand the
precise location of your proposed project, including a street address, if any, the tax lot
number, and section, township, and range. If a proposal would occur over a range of
area, provide the range or boundaries of the site(s). Provide a legal description, site
plan, vicinity map, and topographic map, if reasonably available. While you should
submit any plans required by the agency, you are not required to duplicate maps or
detailed plans submitted with any permit applications related to this checklist.
The project is located on the bank of the Green River immediately Southeast of the building
located at 14900 Interurban Avenue South.
12. Does the proposal lie within an area designated on the City's Comprehensive Land Use
Policy Plan Map as environmentally sensitive?
Yes
\\deptstore\City Common\TeriUQRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 2
SEPA Checklist
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
B. ENVIRONMENTAL ELEMENTS
1. Earth
a. General description of the site (circle one): Flat, rolling, hilly, steep slopes,
mountainous, other:
The project is located on the bank of the Green River
b. What is the steepest slope on the site (approximate percent slope)?
The river bank is naturally at an approximate 25-30 percent slope. However, the
escarpment from the recent bank slough is nearly vertical and approximately 9 feet high.
c. What general types of soils are found on the site (for example, clay, sand, gravel,
peat, muck)? If you know the classification of agricultural soils, specify them and
note any prime farmland.
Alluvium consisting of very loose to medium dense silty sand to a depth of approximately
35 feet.
d. Are there surface indications or history of unstable soils in the immediate vicinity?
If so, describe.
Yes, the bank at this location is subject to drawdown failures.
e. Describe the purpose, type, and approximate quantities of any filling or grading
proposed. Indicate source of fill.
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 3
SEPA Checklist ,
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
f. Could erosion occur as a result of clearing, construction, or use?
If so, generally describe.
Yes, erosion could result during clearing of the bank. This erosion will be minimized by
installing erosion and sediment controls during construction. The site will be permanently
stabilized using a robust revegetion plan.
g. About what percent of the site will be covered with impervious surfaces after
project construction (for example, asphalt or buildings)?
No new impervios surface is proposed
h. Proposed measures to reduce or control erosion, or other impacts to the earth, if
any:
Erosion during construction will be minimized by installing erosion and sediment controls.
The site will be permanently stabilized using a robust revegetion plan.
2. Air
a. What types of emissions to the air would result from the proposal (for example,
dust, automobile odors, industrial wood smoke) during construction and when the
project is completed? If any, generally describe and give approximate quantities if
known.
Minor emissions will result from the use of construction equipment and trucking of
materials.
b. Are there any off -site sources of emissions or odor that may affect your proposal?
If so, generally describe.
No.
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 4
/ f 1
�.' SEPA Checklist
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
c. Proposed measures to reduce or control emissions or other impacts to air, if any:
None.
3. Water
a. Surface:
1. Is there any surface water body on or in the immediate vicinity of the site
(including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)?
If yes, describe type and provide names. If appropriate, state what stream or
river it flows into.
The Green River is located iminediately waterward of the site. The Green River is a
Shoreline of the State (Type S).
2. Will the project require any work over, in, or adjacent to (within 200 feet) the
described waters? If yes, please describe and attach available plans.
Yes. The project will be located wholly within 200 feet of the Ordinary High Water
Mark (OHWM) of the Green River.
3. Estimate the amount of fill and dredge material that would be placed in or
removed from surface water or wetlands and indicate the area of the site that
would be affected. Indicate the source of fill material.
None. No work will occur waterward of the OHWM.
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 5
i
SEPA Checklist
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
4. Will the proposal require surface water withdrawals or diversions? Give
general description, purpose, and approximate quantities, if known.
No.
5. Does the proposal lie within a 100-year floodplain? If so, note location on the
site plan.
Yes.
6. Does the proposal involve any discharges of waste materials to surface waters?
If so, describe the type of waste and anticipated volume of discharge.
No.
b. Ground:
1. Will ground water be withdrawn, or will water be discharged to ground water?
Give general description, purpose, and approximate quantities, if known.
No.
Agency Comments
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 6
' l 1
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
2. Describe waste materials that will be discharged into the ground from septic
tanks or other sources, if any (for example: Domestic sewage; industrial,
containing the following chemicals...; agricultural; etc). Describe the general
size of the system, the number of such systems, the number of houses to be
served (if applicable), or the number of animals or humans the system(s) are
expected to serve:
None.
c. Water Runoff (including storm water):
1. Describe the source of runoff (including storm water) and method of collection
and disposal, if any (include quantities, if known). Where will this water flow?
Will this water flow? Will this water flow into other waters? If so, describe.
The project consists of installing a subsurface gravity drainage system to transport
water away from the riverbank. The drainage system consists of PVC pipe that will
capture subsurface water along the 165-foot length of the bank repair. This
groundwater will flow to outfalls located at OHWM of the Green River. We anticipate
that this flow will be less than 1 gallon per minute under normal conditions.
2. Could waste materials enter ground or surface waters? If so, generally
describe.
No.
d. Proposed measures to reduce or control surface, ground, and runoff water impacts,
if any:
Surface water runoff from the site is not anticipated. Outfall protection will be installed to
minimize the potential fro erosion of the bank.
SEPA Checklist
Agency Comments
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 7
SEPA Checklist ,
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
4. Plants
a. Check or circle types of vegetation found on the site:
✓
Deciduous tree: alder, maple, aspen, other
—
Evergreen tree: fir, cedar, pine, other
✓
Shrubs
Grass
Pasture
Crop or grain
Wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other
Water plants: water lily, eelgrass, milfoil, other
Other types of vegetation
b. What kind and amount of vegetation will be removed or altered?
Vegetation that will be removed consists of noxious and invasive Himalayan blackberry
and English ivy.
c. List threatened or endangered species known to be on or near the site.
None.
d. Proposed landscaping, use of native plants, or other measures to preserve or
enhance vegetation on the site, if any:
Noxious and invasive species will be removed from the project area and the bank will be
restored with native trees and shrubs.
\\deptstore\City Common\Teri \KIRBY - DECEMBER\SEPA Environmental Review Application-Jan0011.docx
Page 8
r •.
SEPA Checklist
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
5. Animals
a. Circle any birds or animals which have been observed on or near the site or are
known to be on or near the site:
Birds:
e-iawk heron, ag ngbird) other:
Mammals:
Deer, bear, elk, beaver, other:
Fish:
Bass, almo ou herring, shellfish, other:
Other:
b. List any threatened or endangered species known to be on or near the site.
The Green River is habitat for endangered Pacific salmon including Chinook salmon,
steelhead trout and bull trout.
c. Is the site part of a migration route? If so, explain.
Yes. The green River is a primary migration route for anadromous salmonids.
d. Proposed measures to preserve or enhance wildlife, if any:
The project propsed to substantially enhance riparian habitat by removing invasive plants
and installing native trees and shrubs.
6. Energy and Natural Resources
a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet
the completed project's energy needs? Describe whether it will be used for heating,
manufacturing, etc.
None.
\\deptstore\City Common \Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 9
SEPA Checklist . •
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
b. Would your project affect the potential use of solar energy by adjacent properties?
If so, generally describe.
No.
c. What kinds of energy conservation features are included in the plans of this
proposal? List other proposed measures to reduce or control energy impacts, if any:
None.
7. Environmental Health
a. Are there any environmental health hazards, including exposure to toxic chemicals,
risk of fire and explosion, spill, or hazardous waste, that could occur as a result of
this proposal? If so, describe.
No.
1. Describe special emergency services that might be required.
None.
2. Proposed measures to reduce or control environmental health hazards, if any:
None.
\\deptstore\City Common\Teri \KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 10
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
b. Noise
1. What types of noise exist in the area which may affect your project (for
example: traffic, equipment, operation, other)?
The project will not be affected by existing sources of noise.
2. What types and levels of noise would be created by or associated with the
project on a short-term or long-term basis (for example: traffic, construction,
operation, other)? Indicate what hours noise would come from the site.
The project will result in short term elevated levels of noise from construction
equipment. However, baseline noise levels are high due to traffic on Interurban
Avenue South and an existing capital improvement project adjacent to the site.
3. Proposed measures to reduce or control noise impacts, if any:
None.
8. Land and Shoreline Use
a. What is the current use of the site and adjacent properties?
The site is currently used as light commercial office space with associated parking areas.
b. Has the site been used for agriculture? If so, describe.
Yes, Aerial imagery from King County indicates that the site was farmed in the 1930's.
SEPA Checklist
Agency Comments
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan201 l.docx
Page 11
SEPA Checklist . •
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
c. Describe any structures on the site.
An approximately 57,000 square -foot, 2-story office building and parking areas are located
on the parcel.
d. Will any structures be demolished? If so, what?
No.
e. What is the current zoning classification of the site?
Regional Commercial Mixed -Use (RCM).
f. What is the current comprehensive plan designation of the site?
Regional Commercial Mixed -Use (RCM).
g. If applicable, what is the current shoreline master program designation of the site?
Urban Conservancy.
\\deptstore\City Common \Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 12
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
h. Has any part of the site been classified as an "environmentally sensitive" area? If
so, specify.
Yes. The site is wholly within the 100-foot wide river buffer.
i. Approximately how many people would reside or work in the completed project?
None.
j. Approximately how many people would the completed project displace?
NOne.
k. Proposed measures to avoid or reduce displacement impacts, if any:
N/A.
1. Proposed measures to ensure the proposal is compatible with existing and projected
land uses and plans, if any:
N/A.
SEPA Checklist
Agency Comments
\\deptstore\City Common\Teri\K1RBY - DECEMBER\SEPA Environmental Review Application-Jan201 I.docx
Page 13
SEPA Checklist
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
9. Housing
a. Approximately how many units would be provided, if any? Indicate whether high,
middle, or low-income housing?
N/A.
b. Approximately how many units, if any, would be eliminated? Indicate whether
high, middle, or low-income housing.
N/A.
c. Proposed measures to reduce or control housing impacts, if any:
N/A.
10. Aesthetics
a. What is the tallest height of any proposed structure(s), not including antennas what
is the principal exterior building material(s) proposed?
N/A.
b. What views in the immediate vicinity would be altered or obstructed?
The prosposed trees may obscure the the existing views of the river.
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 14
/ f 1
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
c. Proposed measures to reduce or control aesthetic impacts, if any:
The proposed planting plan has been developed to maintain existing view corridors to the
extent practical.
11. Light and Glare
a. What type of light or glare will the proposal produce? What time of day would it
mainly occur?
None.
b. Could light or glare from the finished project be a safety hazard or interfere with
views?
N/A.
c. What existing off -site sources of light or glare may affect your proposal?
None.
d. Proposed measures to reduce or control light and glare impacts, if any:
N/A.
SEPA Checklist
Agency Comments
\\deptstore\City Common \ Teri \KJRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 15
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
12. Recreation
a. What designed and informal recreational opportunities are in the immediate
vicinity?
The owner maintains an existing asphalt pedestrian trial located at the top of the riverbank.
A primitive trail is located approximately 200 feet south of the site which is used by
anglers to access the river.
b. Would the proposed project displace any existing recreational uses? If so, describe.
No.
c. Proposed measures to reduce or control impacts on recreation, including recreation
opportunities to be provided by the project or applicant, if any:
None.
13. Historic and Cultural Preservation
a. Are there any places or objects listed on, or proposed for, National, State, or Local
preservation registers known to be on or next to the site? If so, generally describe.
None known.
SEPA Checklist
Agency Comments
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 16
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
b. Generally describe any landmarks or evidence of historic, archaeological,
scientific, or cultural importance known to be on or next to the site.
None known.
c. Proposed measures to reduce or control impacts, if any:
N/A
14. Transportation
a. Identify public streets and highways serving the site, and describe proposed access
to the existing street system. Show on site plans, if any.
The site is accessed from Interurban Avenue South via the existing parking area on the
south side of the property.
b. Is the site currently served by public transit? If not, what is the approximate
distance to the nearest transit stop?
Bus routes are located on Interurban Avenue South. Bus stops are located approximately
500 feet north and south of the site.
c. How many parking spaces would the completed project have? How many would
the project eliminate?
The project proposes no parking and no parking will be eliminated.
SEPA Checklist
Agency Comments
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 17
SEPA Checklist .
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
d. Will the proposal require any new roads or streets, or improvements to existing
roads or streets, not including driveways? If so, generally describe (indicate
whether public or private).
No.
e. Will the project use (or occur in the immediate vicinity of) water, rail, or air
transportation? If so, generally describe.
No.
f. How many vehicular trips per day would be generated by the completed project? If
known, indicate when peak volumes would occur.
No project will not generate vehicle trips.
g. Proposed measures to reduce or control transportation impacts, if any:
N/A.
15. Public Services
a. Would the project result in an increased need for public services (for example: fire
protection, police protection, health care, schools, other)? If so, generally describe.
No.
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 18
/ \
•\
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
b. Proposed measures to reduce or control direct impacts on public services, if any.
N/A.
16. Utilities
a. Circle utilities currently available at the site:
4ectnc'tritural g,cigiat; - se serve
system
other:
septic
b. Describe the utilities that are proposed for the project, the utility providing the
service, and the general construction activities on the site or in the immediate
vicinity which might be needed.
No utilities are proposed for the project.
SEPA Checklist
Agency Comments
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 19
SEPA Checklist
(NON -PROJECT PROPOSALS (E.G., SUBURBAN PLANS AND ZONING CODE TEXT CHANGES) MUST •
COMPLETE THE FOLLOWING PAGES).
C. SUPPLEMENTAL SHEET FOR NON -PROJECT PROPOSALS
(do not use this sheet for project actions)
Because these questions are very general, it may be helpful to read them in conjunction with the list of elements of
the environment.
When answering these questions, be aware of the extent the proposal, or the types of activities likely to result from
the proposal, would affect the item at a greater intensity or at a faster rate than if the proposal were not
implemented. Respond briefly and in general terms.
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses: Agency Comments
1. How would the proposals be likely to increase discharge to water; emissions to air;
production, storage, or release of toxic or hazardous substances; or production of noise?
Proposed measures to avoid or reduce such increases are:
2. How would the proposal be likely to affect plants, animals, fish, or marine life?
Proposed measures to protect or conserve plants, animals, fish, or marine life are:
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jam2011.docx
Page 20
i
SEPA Checklist
Please respond to all questions. Use separate sheets as necessary.
Applicant Responses:
Proposed measures to avoid or reduce shoreline and land use impacts are:
6. How would the proposal be likely to increase demands on transportation or public
service and utilities?
Proposed measures to reduce or respond to such demand(s) are:
7. Identify, if possible, whether the proposal may conflict with Local, State, or Federal
laws or requirements for the protection of the environment.
D. SIGNATURE
Agency Comments
Under the penalty of perjury the above answers under ESA Screening Checklist and State Environmental Policy Act
Checklist are true complete to the best of my knowledge. I understand that the lead agency is relying on them to
make its decisi
Signature:
Date Submitted:
20/�
\\deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.docx
Page 22
CITY OF TUKWILA
71z/ //
Department of Community Development SEPA
6300 Southcenter Boulevard, Tukwl,9�: ENVIRONMENTAL
Telephone: (206) 431-3670
JUN 242015 REVIEW
Community
Develo.me
APPLICATION
FOR STAFF USE ONLY Permits Plus TYPE: P-SEPA
Planner:
File Number: _
/�
V G� 56_?__
Application Complete Date:
Project File Number: pt.,/
-
(-/
Application Incomplete Date:
Other File Numbers: G 1
n6,
NAME OF PROJECT/DEVELOPMENT: Green River Bank Repair
BRIEF DESCRIPTION OF SCOPE OF WORK:
Install a subsurface drainage system and restore an eroded bank on the Green River.
LOCATION OF PROJECT/DEVELOPMENT: Give street address or, if vacant, indicate lot(s), block and
subdivision, access street, and nearest intersection.
14900 Interurban Avenue South
LIST ALL TAX LOT NUMBERS (this information may be found on your tax statement).
Parcel #3597000006
0/-7zr.th„
DEVELOPMENT COORDINATOR:
The individual who:
• has decision making authority on behalf of the owner/applicant in meetings with City staff,
• has full responsibility for identifying and satisfying all relevant and sometimes overlapping development standards,
and
• is the primary contact with the City to whom all notices and reports will be sent.
Name: Thomas Bannister- GeoEngineers, Inc.
Address: 600 Stewart Street, Suite 1700. Seattle, Washington 98101
Phone: (206) 728-2674 FAX:
E-mail: tb fs,er�geoengineers.com
Signature: /I'L)i#i
2
Date:
2oic
\\Deptstore\City Common \Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.Docx
Check items
submitted
with
application
Information Requ _ 1. May be waived in unusual cases, upon ?royal of both Public Works and
Planning
PROJECT DESCRIPTION AND ANALYSIS:
9. Vicinity Map with site location.
10. Provide four (4) copies of any sensitive area studies such as wetland or geotechnical reports if
needed per Tukwila's Sensitive Areas Ordinance (TMC 18.45). See the Geotechnical Report
Guidelines and Sensitive Area Special Study Guidelines for additional information.
11. Any drawings needed to describe the proposal other than those submitted with the underlying
permit. Maximum size 24" x 36".
\\Deptstore\City Common\Teri\KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.Docx
a
3001-01 DESI
01\00\CAD \21
s 133rd St
Sr
3q
rh
nr
4'
06 FOSTER
Sr37th St
Y C
P
e
JUN 24 2015
Coma. a1
Development
a
yryC
5 139th 5t
aJ. Y k
5140th St 5 140th 5Cia1,.'�
4
Showalter Middle
School
es
Foster Nigh School
5 144th St
St
5 160th St
S 146th 5t
t
a
S 150th St
eryrer B/Ltf 0
5 1 S61h St
S 164th St
S 166th St
4
` f n
Crystal Springs
• Park
ti
ya`
Sr 6
rhpr °ot,
odi
ROs
Foster Goll links
S144th5t
4'
S 147th St
1,1
5 150th St
5 152nd 5t
d_
4
s0G
4'
LD SCHNIEDER
GREEN RIVER BANK REPAIR
TUKWILA, WASHINGTON
5 130th 5t
S Langston Rd S Langston Rd
5 132nd St S 132nd st
5 133rd St
CD
P
Black River Quarry
BLACK RIVER
5143rd St JUNCTION
S 143rd PI
PROJECT
SITE
c_
Dent Park
'' Fort
r49th 5 a
W 9
PS
rt
N
S 153rd St f
Tukwila Park
S
Tukwila erglvdf -,;
u[hten
wy Tukwila Pkwy
3
a
o c
o z f
Southrenter ▪ Mall
Baker Blvd as
Strander Blvd
Frock Dr
VICINITY MAP
SCALE: 1 "=100'
GRAPHIC SCALE
1000 1000
FEET
5
t
S 132nd St 13m2n
S 134th St
S 135th St
Black River Ripanan
Forest and Wetland
0
t v
1 Tukwila
SW 16th St
SW 27th sr
SHEET INDEX:
1 VICINITY MAP AND SITE MAP
2 NOTES AND SPECIFICATIONS
$ SITE PLAN
4 CROSS —SECTIONS
5 DETAILS
SCALE: 1 "=400'
GRAPHIC SCALE
400 0 400
FEET
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV
Description
Dote
By
Chk Rev
DESIGNED LJS
DRAWN TJM
CHECKED JMA
DATE 05/27/15 1FILE NO. 21493-001-01
SCALE AS NOTED REVISED. 00/00/00
GEOENGINEERS
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
VICINITY MAP AND SITE MAP
SHEET
1
1-
0
z
a
w
z
a
1-
3
01\00\CAD\21493001-01 DES
GENERAL NOTES:
1. THESE DESIGNS AND DRAWINGS HAVE BEEN PREPARED FOR THE EXCLUSIVE USE OF LD SCNEIDER, AND
THEIR AUTHORIZED AGENTS. NO OTHER PARTY CAN RELY ON THE PRODUCT OF OUR SERVICES UNLESS
GEOENGINEERS INC. (GEOENGINEERS) AGREES IN WRITING IN ADVANCE OF SUCH USE.
2. THE DRAWINGS CONTAINED WITHIN SHOULD NOT BE APPLIED FOR ANY PURPOSE OR PROJECT EXCEPT
THE ONE SPECIFIED.
3. THESE DESIGNS AND DRAWINGS ARE COPYRIGHTED BY GEOENGINEERS, INC. ANY USE, ALTERATION,
DELETION, OR EDITING OF THIS DOCUMENT WITHOUT EXPLICIT WRITTEN PERMISSION FROM GEOENGINEERS
IS STRICTLY PROHIBITED. ANY OTHER UNAUTHORIZED USE OF THIS DOCUMENT IS PROHIBITED.
4. THE CONTRACTOR SHALL CONSTRUCT THE PROJECT IN ACCORDANCE WITH THE PLANS STAMPED
"APPROVED FOR CONSTRUCTION." THESE PLANS WILL BE PROVIDED TO THE CONTRACTOR BY THE
ENGINEER OR PROJECT INSPECTOR PRIOR TO CONSTRUCTION. WORK SHALL NOT BE INITIATED WITHOUT
THE PLANS APPROVED FOR CONSTRUCTION.
5. THE DESIGNS DEPICTED HEREIN ARE APPROXIMATE AND ARE INTENDED TO EXPRESS THE OVERALL DESIGN
INTENT OF THE PROJECT. THESE DESIGNS MAY NEED TO BE ADJUSTED IN THE FIELD DURING
CONSTRUCTION IN ORDER TO MEET THE SPECIFIC SITE CONDITIONS AND INTENDED FUNCTION. THESE
RIVER IMPROVEMENTS HAVE BEEN DEVELOPED WITH THE UNDERSTANDING THAT A QUALIFIED
GEOENGINEERS ENGINEER AND/OR SCIENTIST BE ON -SITE TO PROVIDE CONSTRUCTION GUIDANCE WHILE
THE PROJECT IS CONSTRUCTED.
6. CONDITIONS CAN CHANGE AND THESE DESIGNS ARE BASED ON CONDITIONS THAT EXISTED AT THE TIME
THE DESIGN WAS PERFORMED. THE RESULTS OF THESE DESIGNS MAY BE AFFECTED BY THE PASSAGE
OF TIME, BY MANMADE EVENTS SUCH AS CONSTRUCTION ON OR ADJACENT TO THE SITE, OR BY NATURAL
EVENTS SUCH AS FLOODS, EARTHQUAKES, SLOPE INSTABILITY OR GROUNDWATER FLUCTUATIONS. ALWAYS
CONTACT GEOENGINEERS BEFORE APPLYING THESE DESIGNS TO DETERMINE IF THEY REMAIN APPLICABLE.
7. THESE PLANS AND ELECTRONIC DRAWINGS ARE BASED ON WASHINGTON STATE PLANE NORTH
COORDINATES US FEET AND A NORTH AMERICAN VERTICAL DATUM OF 1988 US FEET. ELEVATIONS AND
NORTHINGS AND EASTINGS WITHIN THIS PLANSET ARE BASED ON THESE DATUMS.
CONSTRUCTION NOTES:
1. CONTRACTORS WORKING WITHIN THE PROJECT BOUNDARIES ARE RESPONSIBLE FOR COMPLIANCE WITH ALL
APPLICABLE SAFETY LAWS. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL BARRICADES, SAFETY
DEVICES AND CONTROL OF TRAFFIC WITHIN AND AROUND THE CONSTRUCTION AREA.
2. MATERIAL AND WORKMANSHIP FURNISHED ON OR FOR THE PROJECT MUST MEET THE MINIMUM
REQUIREMENTS OF PROJECT PERMITS, APPROVING AGENCIES, SPECIFICATIONS AS SET FORTH HEREIN, OR
WHICHEVER IS MORE RESTRICTIVE.
3. THE CONTRACTOR SHALL INSTALL AND MAINTAIN APPROPRIATE SEDIMENT CONTROL DEVICES THROUGHOUT
THE WHOLE PROJECT SITE, INCLUDING THE CONSTRUCTION STAGING AREA AND STOCKPILE AREA
THROUGHOUT THE PROJECT'S CONSTRUCTION. TEMPORARY CONSTRUCTION AND PERMANENT EROSION
CONTROL MEASURES SHALL BE DESIGNED, CONSTRUCTED AND MAINTAINED IN ACCORDANCE WITH
APPLICABLE LOCAL, STATE AND FEDERAL REGULATIONS.
4. CONSTRUCTION SHALL OCCUR DURING THE APPROVED WDFW FISH WINDOW FOR THE PROJECT AREA.
5. DISCHARGES ENTERING ACTIVE STREAMS ON -SITE SHALL SATISFY ALL STATE AND FEDERAL STANDARDS
AND PROJECT PERMIT REQUIREMENTS FOR CONTAMINANTS AND TURBIDITY.
SPECIFICATIONS:
A. REFERENCED SPECIFICATIONS ARE FROM THE 2014 VERSION OF THE WSDOT STANDARD SPECIFICATIONS
FOR ROAD, BRIDGE, AND MUNICIPAL CONSTRUCTION.
MATERIALS:
A. RIVERBANK FILL
1. RIVERBANK FILL SHALL CONSIST OF WELL GRADED SAND AND GRAVEL CONFORMING TO EITHER WSDOT
STANDARD SPECIFICATION 9-03.10 "AGGREGATE FOR GRAVEL BASE", 9-03.12(2) "GRAVEL BACKFILL FOR
WALLS", 9-03.13(1) "GRAVEL BORROW", 9-03.13(2) "SELECT BORROW", OR OTHER MATERIALS AS
APPROVED BY THE GEOTECHNICAL ENGINEER. NATIVE ALLUVIUM FROM THE EXISTING RIVERBANK MAY BE
INCORPORATED INTO THE RIVERBANK FILL PROVIDED THAT THE ALLUVIUM CONTAINS LESS THAN 30
PERCENT FINES (MATERIAL PASSING THE NO. 200 SIEVE) BY WEIGHT OR AS APPROVED BY THE
GEOTECHNICAL ENGINEER.
2. RIVERBANK FILL SHALL BE FREE OF ORGANICS OR OTHER DELETERIOUS MATERIALS.
B. DRAINAGE ROCK
1. DRAINAGE ROCK SHALL MEET WSDOT STANDARD SPECIFICATION 9-03.12(2) "GRAVEL BACKFILL FOR
WALLS."
C. DRAIN PIPE
1. DRAIN PIPE SHALL CONSIST OF 4-INCH SCHEDULE 40 PVC PIPE. THE PIPE SHALL BE SOLID OR
PERFORATED AS INDICATED ON THE PROJECT PLANS. THE PIPE AND CONNECTIONS SHALL MEET AASHTO
SPECIFICATION M 278. PIPE CONNECTIONS AND DETAILING SHALL BE IN ACCORDANCE WITH THE
MANUFACTURER'S RECOMMENDATIONS.
2. PERFORATED DRAIN PIPE INSTALLED PARALLEL TO THE SLOPE AND SHALL CONNECT TO SOLID DRAIN
D.
1.
PIPES (OUTLET DRAINS) THAT DAYLIGHT TO THE SLOPE FACE. SOLID DRAIN PIPES SHALL BE SPACED NO
MORE THAN 20 FEET APART. SOLID DRAIN PIPES SHALL DISCHARGE ON AN EROSION PROTECTION PAD
OR EXTEND TO THE BASE OF THE EXISTING SLOPE. EROSION PROTECTION PADS SHALL BE
CONSTRUCTED OF MATERIAL CONFORMING TO WSDOT STANDARD SPECIFICATION 9-03.9(2) "PERMEABLE
BALLAST". THE EROSION PROTECTION PADS SHALL BE FIELD FIT BY THE ENGINEER AT THE DISCHARGE
LOCATIONS AND SHALL HAVE A MINIMUM THICKNESS OF 6-INCHES, MINIMUM LENGTH (PARALLEL TO
SLOPE) OF 2 FEET, AND MINIMUM WIDTH (PERPENDICULAR TO SLOPE) OF 1 FOOT.
NON -WOVEN GEO-TEXTILE
NON -WOVEN GEO-TEXTILE SHALL MEET WSDOT STANDARD SPECIFICATION 9-33.1 "GEOSYNTHETIC
MATERIAL REQUIREMENTS" FOR NON -WOVEN GEO-TEXTILES USED FOR SEPARATION.
E. RECYCLED MATERIAL
1. RECYCLED MATERIAL SHALL NOT BE USED IN AGGREGATES OR FILL.
F. TOPSOIL
1. TOPSOIL SHALL CONSIST OF A COMMERCIALLY AVAILABLE 3-WAY MIXTURE CONSISTING OF LOAM SOIL,
ORGANICS AND COMPOST PASSING W-INCH SIEVE.
G. EROSION CONTROL BLANKET
1.EROSION CONTROL BLANKET SHALL COMPLY WITH WSDOT STANDARD SPECIFICATION 9-14.5(2)D
"BIODEGRADABLE EROSION CONTROL BLANKET FOR DITCHES. THE EROSION CONTROL BLANKET SHALL BE
100-PERCENT BIODEGRADABLE INCLUDING THE MESH BACKING.
EXECUTION:
A. SUBGRADE PREPARATION
1. SUBGRADES SHALL BE CLEARED AND GRUBBED. REMOVE BRUSH, SOD, OR OTHER ORGANIC OR
DELETERIOUS MATERIALS PRIOR TO THE PLACEMENT OF FILL. SOFT AREAS SHALL BE OVEREXCAVATED
AND REPLACED, AS DIRECTED BY GEOTECHNICAL ENGINEER.
2. SUBGRADE SHALL BE APPROVED BY GEOTECHNICAL ENGINEER. SUBGRADE SOILS SHALL BE COMPACTED
TO A FIRM AND UNYIELDING CONDITION BEFORE CONSTRUCTION PROCEEDS. SUBGRADE MATERIALS NOT
MEETING GEOTECHNICAL ENGINEER'S APPROVAL SHALL BE REMOVED AND REPLACED WITH RIVERBANK FILL
AT DIRECTION OF GEOTECHNICAL ENGINEER.
3. OVEREXCAVATED AREAS SHALL BE REPLACED WITH COMPACTED RIVERBANK FILL MATERIAL.
B. SLOPE PREPARATION
1. EXISTING SLOPES SHALL BE RE -GRADED AS REQUIRED TO INSTALL SPECIFIED IMPROVEMENT AND TO
MAINTAIN A SAFE WORK ZONE. THE CONTRACTOR IS RESPONSIBLE FOR MAINTAINING A SAFE WORK ZONE
AND COMPLYING WITH THE PROVISIONS OF TITLE 296 WASHINGTON ADMINISTRATIVE CODE (WAC), PART N,
"EXCAVATION, TRENCHING AND SHORING."
2. FILL PLACED ON OR ADJACENT TO SLOPES SHALL BE PLACED ON HORIZONTAL BENCHES CUT INTO THE
EXISTING SLOPE.
3. BENCHES SHALL EXTEND A MINIMUM OF 2-FEET HORIZONTALLY INTO THE SLOPE AND MAY BE CUT IN
STAGES AS THE FILL PROGRESSES.
C. FILL PLACEMENT AND COMPACTION
1. FILL MATERIAL SHALL BE PLACED IN LOOSE LIFTS NOT EXCEEDING 12-INCHES AND COMPACTED USING
EQUIPMENT DESIGNED FOR SOIL COMPACTION.
2. FILL SHALL BE UNIFORMLY COMPACTED TO A MINIMUM 90 PERCENT OF MAXIMUM DRY DENSITY (MDD) AS
DETERMINED BY ASTM D-1557.
D. SITE REVEGETATION
1. TOPSOIL SHALL BE LOOSELY PLACED ABOVE THE RIVERBANK FILL TO A DEPTH OF 12 INCHES. THE
FINISH GRADE SHALL BE TAMPED FIRM AND PROTECTED FROM EROSION.
2. THE EROSION CONTROL BLANKET SHALL BE SHINGLED OR PLACED IN A MANNER SUCH THAT RIVER
FLOWS AND WIND DO NOT PEEL UP THE FABRIC. THE EROSION CONTROL FABRIC SHALL BE ANCHORED
FOLLOWING THE MANUFACTURER'S INSTRUCTION.
3. NATIVE PLANTS, IDENTIFIED IN THE PLANT SCHEDULE, SHALL BE INSTALLED FOLLOWING THE LAYOUT
PROVIDED BY THE GEOENGINEERS BIOLOGIST. PLANTS SHALL BE INSTALLED THROUGH THE EROSION
CONTROL FABRIC BY CUTTING THE FABRIC TO THE MINIMUM NECESSARY TO INSTALL THE PLANTS.
E. SITE MAINTENANCE AND MONITORING
1. THE SITE WILL BE MAINTAINED BY THE OWNER INTO PERPETUITY AND IN COMPLIANCE WITH THE
PROJECT PERMITS.
2. THE SITE WILL BE MONITORED FOR A PERIOD OF FIVE YEARS FOLLOWING PLANT INSTALLATION AS
SPECIFIED IN THE DESIGN AND ANALYSIS REPORT BY GEOENGINEERS OR AS REQUIRED BY THE PROJECT
PERMITS.
ANTICIPATED MATERIAL SCHEDULE
APPROXIMATELY 420 YD3 OF CUT AND FILL:
• -160 YD3 OF NATIVE MATERIAL TO REMAIN ON SITE.
• «160 YD3 OF IMPORTED RIVERBANK FILL.
• «96 YD3 OF IMPORTED TOPSOIL.
• "'3 YD3 OF 1-INCH DRAIN ROCK.
• YD3 OF IMPORTED OUTFALL PROTECTION.
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV
Description
Date
Chk
Re
DESIGNED LJS
DRAWN
TJM
DATE 05/27/15
FILE NO. 21493-001-01
SCALE AS NOTED
REVISED: OOJ0DL00
GEOENGINEERS
660 Stewart Steet, SJite 1700 P: 206-728-2674
Seattle, WA 9810' l: 206-728-2132
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
NOTES AND SPECIFICATIONS
SHEET
2
CHECKED JMA
e/ -0007
G\TAB:PLAN VIEW
01\00\CAD \21495001-01 DES
\\`
B-i
OHWM
OHWM
ASPHALT
TRAIL
OHWM
100' WIDE TYPOS RIVER BUFFER &
URBAN CONSERVANCY BUFFER
\
COMMERCIAL BUILDING
OHWM
\\
LEGEND
BORING LOCATIONS*
EXISTING CONTOURS
PROPOSED BANK LINES
ORDINARY HIGH WATER MARK
LIMITS OF WORK
SILT FENCE
BORING LOGS PROVIDED IN ACCOMPANYING REPORT (GEOENGINEERS 2015)
VERTICAL DATUM: NAVD88
OHWM
0
STONE BENCH
WM
B-1
GREEN RIVER
OHWM
EL=1 0.0'
OHWM
OHWM
STONE BENCH
PLAN VIEW
SCALE: 1 "=10'
SCALE
10
FEET
OUTLET DRAIN
(TYP.)
BOTTOM OF FILL SLOPE r— SILT FENCE
30" SYCAMORE
oHWM
24" SYCAMORE
ONWM OHWM
TOP OF
EXISTING SLOPE
41" SYCAMORE
PROTECT TREES PER
CITY REQUIREMENTS
(TYP)
OHW
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV Description Dote
y Chk Rev
T
DESIGNED LJS
—r
+ + 4-
DRAWN TJM
CHECKED JMA
DATE 05/27/15_. _ -FILE N0. 21493-001-01
SCALE AS NOTED __
REVISED: 00/00/00
GEOENGINEERS
BCC Stewart St-eet. Sete '7C2 P: 206 728 2614
Seattle, RA 98'01 F _.^.6-'28-2732
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
SITE PLAN
SHEET
3
0
N
1-
r
g REV
a
a
/ 1 4,- \
24" SYCAMORE
(PROTECT TREE PER
CITY REQUIREMENT)
30
20
10
�---- PARKING LOT
1
------------
LANDWARD LIMITS OR WORK
1 EXISTING
1 ASPHALT
TRAIL
SEE ANCHOR TRENCH DETAIL
CUT AS REQUIRED FOR SAFETY AND STABILITY
TOP SOIL — EXISTING GRADE
2%
RIVERBANK FILL
EROSION CONTROL FABRIC
SEE DRAIN DETAIL 1 OUTLET DRAIN —
SEE ANCHOR TRENCH DETAIL
— 30
OUTFALL PROTECTION PER
MATERIAL NOTE C-2 —
BASE FLOOD ELEVATION
SILT FENCE
(WATERWARD LIMITS
OF WORK)
10
30" SYCAMORE
(PROTECT TREE PER
CITY REQUIREMENT)
30 —
PARKING LOT
20 30
SECTION
40
Distance (Feet)
50
60
A
HORIZONTAL SCALE: 1"=5'
VERTICAL SCALE: 1"=5'
LANDWARD
EXISTING
ASPHALT
TRAIL
---------------------------------
20 —
10 -
SEE ANCHOR TRENCH DETAIL
LIMITS OR WORK
CUT AS REQUIRED FOR SAFETY AND STABILITY
SEE DRAIN DETAIL
2.5
1
C-2
EXISTING GRADE
TOP SOIL
2%
RIVERBANK FILL
70
EROSION CONTROL FABRIC
SEE ANCHOR TRENCH DETAIL
BASE FLOOD ELEVATION
OUTFALL PROTECTION PER
MATERIAL NOTE C-2 —
80 85
—30
SILT FENCE
(WATERWARD LIMITS
OF WORK)
OHWM
0
0 20
SCALE SECTION
5 5
FEET
30
40
Distance (Feet)
50
B
HORIZONTAL SCALE: 1"=5'
VERTICAL SCALE: 1"=5'
C-2
60
70 80
0
20
10
0
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
Description
Date
By
Chk
Rev
DESIGNED LJS
DRAWN TJM
DATE 05/27/15
FILE NO. 21493-001-01
CHECKED JMA _ _
SCALE AS NOTED
REVISED. 00/00/00
•'OSEPij
wasti `STO
/If�1
•
45765 C
GEOENGINEERS
600 Stewart St"eet, SJite 17C0 P: 206-728-2674
Seattle, WA 98101 F: 206-728-2732
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
CROSS -SECTIONS AND DRAIN DETAIL
SHEET
C-3
•
Lel
CAD\21493001-0I DESI
4" SCH40 PERFORATED
PVC DRAIN PIPE
EL. 15.0'
RIVERBANK FILL
NON —WOVEN GEOTEXTILE
12"
12"
DRAIN DETAIL
SOLID SCH40 PVC
OUTLET DRAIN
2%
NATIVE SOIL
NOT TO SCALE
Recommended Planting Schedule
Estimated Common Name Scientific Name Size Spacing
Quantity
5 Black cottonwood Populus balsamifera 6 - 8 feet in height 10 feet o.c.
9 Western red cedar Thuja plicata 6 - 8 feet in height 10 feet o.c.
5 Big leaf maple Acer macrophyllum 6 - 8 feet in height 10 feet o.c.
5 Pacific dogwood Corpus nutalli 6 - 8 feet in height 10 feet o.c.
25 Vine maple Acer circinatum 6 - 8 feet in height 10 feet o.c.
25 Oceanspray Holodiscus discolor 24-inch in height 5 feet o.c
25 Snowberry Symphoricarpos albus 24-inch in height 5 feet o.c
25 Western serviceberry Amelanchieralnifolia 24-inch in height 5 feet o.c
25 Red osier dogwood Cornus sericea 24-inch in height 5 feet o.c
JOINTS IN FILTER FABRIC SHALL BE SPLICED
AT POSTS. USE STAPLES, WIRE RINGS, OR
EQUIVALENT TO ATTACH FABRIC TO POSTS.
2"x2" BY 14 Go. WIRE OR
EQUIVALENT. IF STANDARD
STRENGTH FABRIC USED
FILTER FABRIC
I 1EIi1-III l�
6' MAX. MINIMUM 4%4'. TRENCH
BACKFILL TRENCH WITH
NATIVE SOIL OR 3/4"-1.5"
POST SPACING MAY BE INCREASED WASHED GRAVEL
TO 8' IF WIRE BACKING 15 USED
NOTE: FILTER FABRIC FENCES SHALL BE
INSTALLED ALONG CONTOUR WHENEVER POSSIBLE
J
O
o
�o
o
0-
CO
2"x4" WOOD POSTS, STEEL FENCE
POSTS, REBAR, OR EQUIVALENT
SILT FENCE DETAIL
NOT TO SCALE
r r r r r r V v
2X ROOT
BALL WIDTH
EROSION CONTROL FABRIC
LOOSEN AND/OR CUT CIRCLING ROOTS
IN ROOT BOUND CONTAINERS BEFORE
PLANTING
BREAK UP SIDES AND BOTTOMS
OF PLANTING PIT TO ALLOW
FOR ROOT PENETRATION
COMPACT SUBGRADE
BELOW ROOT BALL
PLANT SCHEDULE TYPICAL PLANTING DETAIL
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV
Description
Dote
By
Chk
Rev
DESIGNED LJS
DRAWN
DATE 05/27/15 _ FILE N0. 21493=001-01
TJM
SCALE AS NOTED
CHECKED JMA
,REVISED: 00100 00
GEOENGINEER_
6C0 Stewart Street, c.iite 17320 F: 236 728 -2674
Seat tie, WA 98101 F 236-728-2232
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
DETAILS
SHEET
5
SHORELINE
SUBSTANTIAL DEV
Parent Project:
PL15-0027
MONITORING
This File:
L15-0032
L.I5-0o32_,
GEOENGINEERQ
Plaza 600 Building
600 Stewart Street, Suite 1700
Seattle, Washington 98101
206.728.2674
January 17, 2017
LD Schneider and Associates
3200 North Central Avenue, Suite 1470
Phoenix, Arizona 85012
Attention: Kurt Schneider
Subject: Restored Conditions Report
Green River Bank Repair
14900 Interurban Avenue South
Tukwila, Washington
GeoEngineers File No. 21493-001-01
INTRODUCTION
GeoEngineers, Inc. (GeoEngineers) is pleased to present this assessment of restored conditions following
a repair of an eroding bank along the Green River at 14900 Interurban Avenue South in Tukwila,
Washington (Figure 1). In the summer of 2016, LD Schneider and Associates (owner) installed a subsurface
drainage system to relieve hydraulic pressure within the riverbank following high flows in the river. As
described in the GeoEngineers (2016) Design Report for the project, the previous bank failures at the
property were, most likely, the result of drawdown failures resulting from excessive hydraulic pressures
within the bank. The approved design of the drainage system is include in Attachment A.
The project was authorized by the City of Tukwila (City) under Public Works permit PW16-0072
and Shoreline Substantial Development Permit L15-0032; and Hydraulic Project Approval (HPA)
2016-4-245+01 issued by the Washington State Department of Fish and Wildlife (WDFW). 0n behalf of the
owner, GeoEngineers completed this assessment as required by the permits issued by the City. The purpose
of this report is to document the restoration of the habitat within the shoreline and buffer of the river; and
to evaluate the implementation of the site restoration plan that was approved by the City and WDFW.
SITE DESCRIPTION AND CONDITIONS
The owner's 3.6-acre property (Parcel #3597000006) is located on the left (west) bank of the Green River,
approximately 2,000 feet upstream of the confluence with the Black River. An approximately
57,000 square -foot, 2-story office building and parking areas are located on the parcel. The parcel is
generally flat and the river is not leveed. 0verbank bank flooding is extremely rare, particularly on the left
bank of the river because the top of right bank is several feet lower than the top of the left bank. The area
LD Schneider and Associates Janus; ...7, 2017
Page 2
of the parcel that is within 200 linear feet of the Ordinary High Water Mark (OHWM) of the Green River is
regulated under the City of Tukwila's Shoreline Master Program. The Shoreline designation for the site
is Urban Conservancy and the River has a buffer of 100 feet measured landward from OHWM. The site
is also designated as a Fish and Wildlife Habitat Conservation Area per Tukwila Municipal Code
(TMC) 18.44.090 H.
Prior to installation of the subsurface drainage system, the riverbank was vegetated with noxious and
invasive species including Himalayan blackberry and English Ivy. Because of the infestation of noxious
species and lack of trees, habitat conditions along the riverbank were degraded. GeoEngineers observed
evidence of a recent slough of the bank located approximately 100 feet southeast of the commercial
building on the property. These type of sloughs occur when high groundwater levels and high river levels
saturate the riverbank soil and then the river levels drops or "draws down" faster than the water can drain
from the riverbank soil. This creates an imbalance of water pressure. The water pressure pushing the bank
from within the soil is no longer balanced by the water pressure from the river and the riverbank is pushed
into the river. In our experience, this is the most common riverbank failure mechanism on the lower Green
River. The recent sloughing resulted in an approximately 10-foot high near vertical escarpment that
damaged the existing asphalt trail at the top of the bank. The trail is separated from the parking lot by a
landscaping island consisting of grass and a row of seven mature London Plane trees.
PROJECT CONSTRUCTION
Installation of the subsurface drainage system began on July 18, 2016. Earthwork and site stabilization
was completed on approximately August 15, 2016. The GeoEngineers design engineer was briefly on site
on July 28 to observe construction and provide guidance to the contractor. Also, the GeoEngineers biologist
was briefly on site on July 22, August 8 and 20, 2016.
Prior to earthwork, the contractor removed vegetation from the excavation area, predominantly Himalayan
blackberry, and installed a silt fence to prevent erosion into the Green River. A 6-foot tall temporary chain
link construction fence was erected to protect the seven London plane trees from damage during
construction. The contractor began excavating the bank to install a perforated 4-inch schedule 40 polyvinyl
chloride (PVC) pipe to capture subsurface water along the length of the bank repair (Attachment A). During
excavation of the bank, an existing rockery was discovered under the English ivy at the northern end of the
project. Following guidance from GeoEngineers, the owner elected to leave the existing rockery in place
and shortened the overall length of the project. Also, the existing vegetation covering the rockery, consisting
of English ivy was left in place. As a result, approximately 90 linear feet of perforated PVC pipe was installed.
Three solid 4-inch PVC finger drains were installed to convey the water from the perforated pipe to outfalls
located landward of OHWM. Small rock was installed at the outfalls to protect against erosion.
Following installation of the drainage system, the excavated area was backfilled with stockpiled excavated
material and imported pit run. In accordance with the approved design, the contractor installed an
approximately 1-foot thick layer of topsoil above the backfill to achieve the finish design elevations. To
minimize erosion, the contractor covered the exposed soils at the site with jute fabric and the silt fence was
left in place.
The contractor was able to limit the disturbed area to approximately 3,000 square feet. As a result, the
number of plants needed to revegetate the riverbank, at the specified density, was reduced. Plant species,
GEOENGINEERZ
File No. 21493-001-01
LD Schneider and Associates Januk_ _,7, 2017
Page 3
size and quantities were revised based on availability at the time of installation. The table below lists the
104 native plants that were installed at the site, based on information provided by the contractor. In an
effort to increase survival, replanting of the bank with native plants was delayed until October 10, 2016.
Quantity Common Name Scientific Name Size
11 Western red cedar Thuja plicata 15 gallon
8 Big leaf maple Acer macrophyllum 5 gallon
32 Vine maple Acer circinatum 5 gallon
27 Oceanspray Holodiscus discolor 3 gallon
26 Snowberry Symphoricarpos albus 2 gallon
SITE MONITORING AND PERFORMANCE STANDARDS
Five years of vegetation monitoring is a requirement of the permits issued by the City. Following the owner's
2016 submittal for a Public Works permit for the project, the City issued a Correction Letter dated May 24,
2016. In the Correction Letter, the City required the owner to submit an agreement stating that the owner
will complete the following monitoring and maintenance tasks:
1. Establish a semi -permanent monitoring transect at the site that is at least 100 feet long and runs
diagonally through the upper and lower portions of the slope along the river. •
2. Establish the following performance standards for the site:
a. The restored areas of the site will achieve 100 percent survival of the installed vegetation
along the transect during the first year (2017) following installation of the plants. Installed
trees will exhibit positive growth during year one.
b. At the end of the 5-year monitoring period (2021) there will be at least 50 percent areal
cover of woody species as measured along the transect.
c. In all five monitoring years (2017-2021), the site will have less than 10 percent areal cover
of undesirable vegetation as measured along the transect. Undesirable vegetation is
defined as species that are listed on the King County noxious weeds list.
3. Identify photo point locations and photo document conditions of the site through the 5-year monitoring
period.
4. Implement corrective action should the site fail to meet the above performance standards.
5. Provide irrigation to the restored area during the first 3 years of the 5-year monitoring period. Because
of the close proximity of the site to the water supply of the building, maintenance crews will adequately
water the restored areas of the site with a hose on an as -needed basis. No temporary irrigation system
will be installed.
6. Install tree protection fencing around the seven mature London plane trees located at the top of the
bank near the site.
7. Submit annual monitoring reports to the City and Karen Walter of the Muckleshoot tribe.
GEOENGINEERS�
Ftle No 21493-001-01
LD Schneider and Associates Jams., .7, 2017
Page 4
A copy of the Maintenance and Monitoring agreement between the owner and the City is included as
Attachment B. In addition to the performance standards of the City, WDFW requires that the site exhibit at
least 80-percent survival of the native plants along the transect for a period of three years (2017-2019).
Baseline (Year 0) Monitoring
On October 21, 2016, a GeoEngineers biologist visited the site to document restored conditions and to
collect baseline vegetation monitoring data. Because of recent precipitation, the river was flowing above
the elevation of OHWM but not into the restored area of the site. According to the US Geological Survey
(2016) streamflow gauge at Tukwila, the water surface elevation of the river was 9.5 feet at the time of our
site visit. The biologist observed that the contractor had installed the plants in a manner meeting the intent
of restoration plan. The contractor avoided planting big leaf maple and cedar trees under the drip line of
the mature London plane trees. As a result, most of the large tree species were installed near the river. The
contractor also installed a layer of composted mulch throughout the revegetated area. Straw wattles were
installed across the fall line of the riverbank to prevent sediment entrainment and erosion.
The biologist established a 100-foot transect along the bank to collect baseline vegetation monitoring data.
The southern endpoint of the transect is located at a cedar tree near the trail and extends to the north,
paralleling the river (Photo 1). The endpoints of the transect were marked with a wooden stake. Using the
line intercept method, the biologist inventoried the number and species of native plants observed within
1 foot of either side of the transect. The table below lists the 11 native plants installed along the transect.
BASELINE VEGETATION DATA
Areal
Transect Location Cover
(feet) (feet)
Plant Species along Transect
Common Name Scientific Name
1 4.7 3.7 Western red cedar Thuja plicata
5 8.9 3.9 Pacific ninebark Physocarpus capitatus
17.3 19 1.7 vine maple Acer circinatum
20.8 23 2.2 vine maple Acer circinatum
26.5 28.2 1.7 vine maple Acer circinatum
31.5 33.2 1.7 Pacific Ninebark Physocarpus capitatus
35.8 37 1.2 Pacific Ninebark Physocarpus capitatus
38.4 41.3 2.9 Pacific Ninebark Physocarpus capitatus
52.3 54.7 2.4 Pacific Ninebark Physocarpus capitatus
57.4 59.2 1.8 Pacific Ninebark Physocarpus capitatus
89.5 91.8 2.3 vine maple Acer circinatum
Total Cover 25.5
GEOENGINEERS
File No 21493-001-01
1
LD Schneider and Associates lanua, j7, 2017
Page 5
Areal cover of installed native plants along the
transect was 25.5 percent. Because of the
presence of English Ivy, 4.5-percent of the transect
at the north end is covered with this noxious vine.
It is our understanding that the restored vegetation
on the bank will be maintained by the on -site
property management staff as a part of their routine
maintenance regimen. Maintenance will include
physical removal of noxious and invasive species
that may be detrimental to the restored riparian
habitat along the riverbank. These noxious and
invasive species include but are not limited to:
■ Knotweeds (Polygonum spp.)
• Butterfly bush (Buddleja spp.)
• Himalayan blackberry (Rubus armeniacus)
■ English ivy (Hedera helix)
■ Scotch broom (Cytisus scoparius)
Use of chemical herbicides to control these species
is considered unnecessary and is not
recommended.
Photo 1. Restored conditions along the transect, facing north.
We recommend that the installed plants be watered during the dry season for a minimum of three years
following plant installation. This watering should occur during the late summer (July to October) and the
frequency shall be determined based on weather conditions and plant performance. We anticipate that the
site will be watered using a hose from the on -site building. Beneficial volunteer plants, such as other native
species, will be encouraged at the site. Installed plants that do not survive will be replaced as required by
the authorizations from the City and WDFW.
CONCLUSION
Based on our observations of the site, it appears that the restoration of the riverbank was completed in
general accordance with the approved restoration plan. The project has resulted in the removal of
Himalayan blackberry infestation within the disturbed area along the riverbank. The contractor installed
native plants in the disturbed areas of the project. GeoEngineers collected baseline monitoring data along
a 100-foot long transect using the line intercept method. We found that 11 native plants, with an areal
cover of approximately 25.5-percent, were installed along the transect. This baseline data will be used to
gauge site performance through the 5-year monitoring period (2017-2021) require by the City and the
3-year monitoring period (2017-2019) required by WDFW.
REFERENCES
GeoEngineers (2016). Revised Final Analysis and Design Report, dated June 10, 2016.
GEOENGINEERS1/7
File No. 21493-001-01
LD Schneider and Associates Jam` ,17, 2017
Page 6
LIMITATIONS
We have prepared this revised report for LD Schneider and Associates for the property at 14900 Interurban
Avenue South in Tukwila, Washington.
Within the limitations of scope, schedule and budget, our services have been executed in accordance with
generally accepted practices in the fields of geotechnical engineering, hydrology, and habitat restoration in
this area at the time this report was prepared. The conclusions, recommendations and opinions presented
in this report are based on our professional knowledge, judgment and experience. No warranty, express or
implied, applies to our services and this report.
Any electronic form, facsimile or hard copy of the original document (email, text, table and/or figure), if
provided, and any attachments should be considered a copy of the original document. The original
document is stored by GeoEngineers, Inc. and will serve as the official document of record.
Sincerely,
Geo a = - rs Inc.
T omas A Ban
Biologist
TAB:JOC:Ieh
er, PWS
Ilaghan, PWS
Asso—late Biologist
Attachments:
Appendix A. Design Sheets
Appendix B. Maintenance and Monitoring Agreement between the City of Tukwila and LD Schneider
One copy submitted electronically
Disclaimer. Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy
of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record.
GEOENGINEERS...0
File No. 21493-001-01
APPENDIX B
Maintenance and Monitoring Agreement
between the City of Tukwila and LD Schneider
GEOENGINEERSQ
Plaza 600 Building
600 Stewart Street, Suite 1700
Seattle, Washington 98101
206.728.2674
June 10, 2016
City of Tukwila
6300 Southcenter Blvd.
Tukwila, Washington 98188
Attention: Valerie Lonneman, Assistant Planner
Subject: Maintenance and Monitoring Agreement
LD Schneider Green River Bank Repair
14900 Interurban Avenue
Tukwila, Washington
File No. 21493-001-01
0n behalf of LD Schneider and Associates (owner), GeoEngineers, Inc. (GeoEngineers) submits this
Maintenance and Monitoring letter to the City of Tukwila (City). The purpose of this letter is to serve as the
five-year Maintenance and Monitoring agreement between the City and the owner. With this letter, the
owner agrees to complete five years of maintenance and monitoring of their Green River Bank Repair
Project located at 14900 Interurban Avenue South in Tukwila, Washington. The five years of vegetation
monitoring is a requirement of the Shoreline permit issued by the City in 2015. Following the owner's
submittal for a Public works permit for the project, the City issued a Correction Letter dated May 24, 2016.
In the Correction Letter, the City requires the owner to submit this agreement stating that the owner will
complete the following vegetation monitoring and maintenance tasks:
1. Establish a semi -permanent monitoring transect at the site that is at least 100 feet long and runs
diagonally through the upper and lower portions of the slope along the river.
2. Establish the following performance standards for the site:
a. The restored areas of the site will achieve 100 percent survival of the installed vegetation
along the transect during the first year (2017) following installation of the plants. Installed
trees will exhibit positive growth during year one.
b. At the end of the 5-year monitoring period (2021) there will be at least 50 percent areal
cover of woody species as measured along the transect.
c. In all five monitoring years (2017-2021), the site will have less than 10 percent areal cover
of undesirable vegetation as measured along the transect. Undesirable vegetation is
defined as species that are listed on the King County noxious weeds list.
City of Tukwila June 10, 2016 \
Page 2
3. Identify photo point locations and photo document conditions of the site through the 5-year monitoring
period.
4. Implement corrective action should the site fail to meet the above performance standards.
5. Provide irrigation to the restored area during the first 3 years of the 5-year monitoring period. Because
of the close proximity of the site to the water supply of the building, maintenance crews will adequately
water the restored areas of the site with a hose on an as -needed basis. No temporary irrigation system
will be installed.
6. Install tree protection fencing around the seven mature sycamore trees located at the top of the bank
near the site.
7. Submit annual monitoring reports to the City and Karen Walter of the Muckleshoot tribe.
The owner commits to completing the above tasks as required by the Shoreline permit for the project. We
anticipate that the City will issue their Public Works permit shortly following submittal of this letter and other
requested documents. The owner plans to install the proposed drainage system in the summer of 2016
during the allowable work window established by the Washington Department of Fish and Wildlife. Following
installation of the drainage system, the river bank will be regraded, per the GeoEngineers design and the
site will be stabilized to prevent erosion and water quality impacts. To maximize the success and survival
of the installed native plants, the owner will install the plants in the fall or winter of 2016. As such, the
owner will monitor the site between 2017 (year 1) and 2021 (year 5).
Please call if you have any questions or if we can be of further assistance.
Sincerely,
GeoEn;. neers, Inc.
omas A. Ban
iologist
1AB:JOC:Ieh
;,ems
ter, PWS
One copy submitted in -person
Associate Biologist
File No. 21493-001-01
GEOENGINEERS
6\TAB:COVER SHEET MODIFIED BY TMICHAUD ON JUN 10, 2016 - 1
P:\21\21493001\00\CAD\21493001-01 FI
'O. FOSTER
�r9XCT. 5t
''Tg
J
5 140th St 140th St
,n S 146th St
f
5 'SOth St
SWt
51S6th St
40
5t
S t6
5 166thSt
'St
139th St
40
ox 1
r4x N>t'
45. °a y
�Rds
000.,Wthrt4
LD SCHNIEDER
GREEN RIVER BANK REPAIR
TUKWILA, WASHINGTON
5 130tf1 St
S anyaSt,a Rd SLan
3 133rd St
ae
bad liner Quarry
BLACK RIVER,
JUNCTION
PROJECT
STTE: "
N
"49th 5
S 153rd St a
1(*000►ark
►ak `,x jj - 'h
y "'�" tea, i 1c SerPhnMet7AY (taker Blvd,
s
,41
VICINITY MAP
SCALE: 1"=100'
GRAPHIC SCALE
1000 1000
FEET
H¢a'S
rs
S 132nd StS- 332n
S �3+th S<
S 135th 5t
O
SHEET INDEX:
1
2
3
4
5
SITE MAP
SCALE. 1"=400'
GRAPHIC SCALE
400 0 400
FEET
L1-5 -00$ `Z-
GEOENGINEERS
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE SOUTH
TUKWILA, WASHINGTON
VICINITY MAP AND SITE MAP
SHEET
1
J
P:\21\21493001\00\CAD\21493001-01 FINAL DESIGN SHEETS.DW6\TAB:NOTES AND DETAILS MODIFIED BY TMICHAUD ON JUN 10, 2016 - 14:52
GENERAL NOTES:
1 THESE DESIGNS AND DRAWINGS HAVE BEEN PREPARED FOR THE EXCLUSIVE USE OF LD SCNEIDER, AND
THEIR AUTHORIZED AGENTS. NO OTHER PARTY CAN RELY ON THE PRODUCT OF OUR SERVICES UNLESS
GEOENGINEERS INC. (GEOENGINEERS) AGREES IN WRITING IN ADVANCE OF SUCH USE.
2. THE DRAWINGS CONTAINED WITHIN SHOULD NOT BE APPLIED FOR ANY PURPOSE OR PROJECT EXCEPT
THE ONE SPECIFIED.
3. THESE DESIGNS AND DRAWINGS ARE COPYRIGHTED BY GEOENGINEERS, INC. ANY USE, ALTERATION,
DELETION, OR EDITING OF THIS DOCUMENT WITHOUT EXPLICIT WRITTEN PERMISSION FROM GEOENGINEERS
IS STRICTLY PROHIBITED. ANY OTHER UNAUTHORIZED USE OF THIS DOCUMENT IS PROHIBITED.
4. THE CONTRACTOR SHALL CONSTRUCT THE PROJECT IN ACCORDANCE WITH THE PLANS STAMPED
"APPROVED FOR CONSTRUCTION." THESE PLANS WILL BE PROVIDED TO THE CONTRACTOR BY THE
ENGINEER OR PROJECT INSPECTOR PRIOR TO CONSTRUCTION. WORK SHALL NOT BE INITIATED WITHOUT
THE PLANS APPROVED FOR CONSTRUCTION.
5. THE DESIGNS DEPICTED HEREIN ARE APPROXIMATE AND ARE INTENDED TO EXPRESS THE OVERALL DESIGN
•INTENT OF THE PROJECT. THESE DESIGNS MAY NEED TO BE ADJUSTED IN THE FIELD DURING
CONSTRUCTION IN ORDER TO MEET THE SPECIFIC SITE CONDITIONS AND INTENDED FUNCTION. THES,
RIVER IMPROVEMENTS HAVE BEEN DEVELOPED WITH THE UNDERSTANDING THAT A QUALIFIED
GEOENGINEERS ENGINEER AND/OR SCIENTIST BE ON -SITE TO PROVIDE CONSTRUCTION GUIDANCE WHILE
THE PROJECT IS CONSTRUCTED.
6. CONDITIONS CAN CHANGE AND THESE DESIGNS ARE BASED ON CONDITIONS THAT EXISTED AT THE TIME
THE DESIGN WAS PERFORMED. THE RESULTS OF THESE DESIGNS MAY BE AFFECTED BY THE PASSAGE
OF TIME, BY MANMADE EVENTS SUCH AS CONSTRUCTION ON OR ADJACENT TO THE SITE, OR BY NATURAL
EVENTS SUCH AS FLOODS, EARTHQUAKES, SLOPE INSTABILITY OR GROUNDWATER FLUCTUATIONS. ALWAYS
CONTACT GEOENGINEERS BEFORE APPLYING THESE DESIGNS TO DETERMINE IF THEY REMAIN APPLICABLE.
7. THESE PLANS AND ELECTRONIC DRAWINGS ARE BASED ON WASHINGTON STATE PLANE NORTH
COORDINATES US FEET AND A NORTH AMERICAN VERTICAL DATUM OF 1988 US FEET. ELEVATIONS AND
NORTHINGS AND EASTINCS WITHIN THIS PLANSET ARE BASED ON THESE DATUMS.
CONSTRUCTION NOTES:
1. CONTRACTORS WORKING WITHIN THE PROJECT BOUNDARIES ARE RESPONSIBLE FOR COMPLIANCE WITH ALL
APPLICABLE SAFETY LAWS. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL BARRICADES, SAFETY
DEVICES AND CONTROL OF TRAFFIC WITHIN AND AROUND THE CONSTRUCTION AREA.
2. MATERIAL AND WORKMANSHIP FURNISHED ON OR FOR THE PROJECT MUST MEET THE MINIMUM
REQUIREMENTS OF PROJECT PERMITS, APPROVING AGENCIES, SPECIFICATIONS AS SET FORTH HEREIN, OR
WHICHEVER IS MORE RESTRICTIVE.
3. THE CONTRACTOR SHALL INSTALL AND MAINTAIN APPROPRIATE SEDIMENT CONTROL DEVICES THROUGHOUT
THE WHOLE PROJECT SITE, INCLUDING THE CONSTRUCTION STAGING AREA AND STOCKPILE AREA
THROUGHOUT THE PROJECT'S CONSTRUCTION. TEMPORARY CONSTRUCTION AND PERMANENT EROSION
CONTROL MEASURES SHALL BE DESIGNED, CONSTRUCTED AND MAINTAINED IN ACCORDANCE WITH
APPLICABLE LOCAL, STATE AND FEDERAL REGULATIONS.
4. CONSTRUCTION SHALL OCCUR DURING THE APPROVED WDFW FISH WINDOW FOR THE PROJECT AREA.
5. DISCHARGES ENTERING ACTIVE STREAMS ON -SITE SHALL SATISFY ALL STATE AND FEDERAL STANDARDS
AND PROJECT PERMIT REQUIREMENTS FOR CONTAMINANTS AND TURBIDITY.
SPECIFICATIONS:
A. REFERENCED SPECIFICATIONS ARE FROM THE 2014 VERSION OF THE WSDOT STANDARD SPECIFICATIONS
FOR ROAD, BRIDGE, AND MUNICIPAL CONSTRUCTION.
MATERIALS:
A. RIVERBANK FILL
1. RIVERBANK FILL SHALL CONSIST OF WELL GRADED SAND AND GRAVEL CONFORMING TO EITHER WSDOT
STANDARD SPECIFICATION 9-03.10 "AGGREGATE FOR GRAVEL BASE", 9-03.12(2) "GRAVEL BACKFILL FOR
WALLS", 9-03.13(1) "GRAVEL BORROW", 9-03.13(2) "SELECT BORROW", OR OTHER MATERIALS AS
APPROVED BY THE GEOTECHNICAL ENGINEER. NATIVE ALLUVIUM FROM THE EXISTING RIVERBANK MAY BE
INCORPORATED INTO THE RIVERBANK FILL PROVIDED THAT THE ALLUVIUM CONTAINS LESS THAN 30
PERCENT FINES (MATERIAL PASSING THE NO. 200 SIEVE) BY WEIGHT OR AS APPROVED BY THE
GEOTECHNICAL ENGINEER.
2. RIVERBANK FILL SHALL BE FREE OF ORGANICS OR OTHER DELETERIOUS MATERIALS.
B.
1.
DRAINAGE ROCK
DRAINAGE ROCK SHALL MEET WSDOT STANDARD SPECIFICATION 9-03.12(4) "GRAVEL BACKFILL FOR
DRAINS."
C. DRAIN PIPE
1. DRAIN PIPE SHALL CONSIST OF 4-INCH SCHEDULE 40 PVC PIPE. THE PIPE SHALL BE SOLID OR
PERFORATED AS INDICATED ON THE PROJECT PLANS. THE PIPE AND CONNECTIONS SHALL MEET AASHTO
SPECIFICATION M 278. PIPE CONNECTIONS AND DETAILING SHALL BE IN ACCORDANCE WITH THE
MANUFACTURER'S RECOMMENDATIONS.
2. PERFORATED DRAIN PIPE INSTALLED PARALLEL TO THE SLOPE AND SHALL CONNECT TO SOLID DRAIN
D.
PIPES (OUTLET DRAINS) THAT DAYLIGHT TO THE SLOPE FACE. SOLID DRAIN PIPES SHALL BE SPACED NO
MORE THAN 20 FEET APART. SOLID DRAIN PIPES SHALL DISCHARGE ON AN EROSION PROTECTION PAD
OR EXTEND TO THE BASE OF THE EXISTING SLOPE. EROSION PROTECTION PADS SHALL BE
CONSTRUCTED OF MATERIAL CONFORMING TO WSDOT STANDARD SPECIFICATION 9-03.9(2) "PERMEABLE
BALLAST". THE EROSION PROTECTION PADS SHALL BE FIELD FIT BY THE ENGINEER AT THE DISCHARGE
LOCATIONS AND SHALL HAVE A MINIMUM THICKNESS OF 6-INCHES, MINIMUM LENGTH (PARALLEL TO
SLOPE) OF 2 FEET, AND MINIMUM WIDTH (PERPENDICULAR TO SLOPE) OF 1 FOOT.
NON -WOVEN GEO-TEXTILE
NON -WOVEN GEO-TEXTILE SHALL MEET WSDOT STANDARD SPECIFICATION 9-33.1 "GEOSYNTHETIC
MATERIAL REQUIREMENTS" FOR NON -WOVEN GEO-TEXTILES USED FOR SEPARATION.
E. RECYCLED MATERIAL
1. RECYCLED MATERIAL SHALL NOT BE USED IN AGGREGATES OR FILL.
F. TOPSOIL
1. TOPSOIL SHALL CONSIST OF A COMMERCIALLY AVAILABLE 3-WAY MIXTURE CONSISTING OF LOAM SOIL,
ORGANICS AND COMPOST PASSING 1-INCH SIEVE.
G. EROSION CONTROL BLANKET AND STRAW WATTLES
1. EROSION CONTROL BLANKET SHALL COMPLY WITH WSDOT STANDARD SPECIFICATION 9-14.5(2)D
"BIODEGRADABLE EROSION CONTROL BLANKET FOR DITCHES. THE EROSION CONTROL BLANKET SHALL BE
100-PERCENT BIODEGRADABLE COIR WITHOUT MESH BACKING. THE EROSION CONTROL BLANKET SHALL
BE APPROVED BY GEOENGINEERS PRIOR TO INSTALLATION.
2. STRAW WATTLE OR SIMILAR SHALL BE 100% BIODEGRADABLE. STRAW WATTLES SHALL BE APPROVED BY
GEOENGINEERS PRIOR TO INSTALLATION.
EXECUTION:
A. SUBGRADE PREPARATION
1. SUBGRADES SHALL BE CLEARED AND GRUBBED. REMOVE BRUSH, SOD, OR OTHER ORGANIC OR
DELETERIOUS MATERIALS PRIOR TO THE PLACEMENT OF FILL. SOFT AREAS SHALL BE OVEREXCAVATED
AND REPLACED, AS DIRECTED BY GEOTECHNICAL ENGINEER.
2. SUBGRADE SHALL BE APPROVED BY GEOTECHNICAL ENGINEER. SUBGRADE SOILS SHALL BE COMPACTED
TO A FIRM AND UNYIELDING CONDITION BEFORE CONSTRUCTION PROCEEDS. SUBGRADE MATERIALS NOT
'MEETING GEOTECHNICAL ENGINEER'S APPROVAL SHALL BE REMOVED AND REPLACED WITH RIVERBANK FILL
AT DIRECTION OF GEOTECHNICAL ENGINEER.
3. OVEREXCAVATED AREAS SHALL BE REPLACED WITH COMPACTED RIVERBANK FILL MATERIAL.
B. SLOPE PREPARATION
1. EXISTING SLOPES SHALL BE RE -GRADED AS REQUIRED TO INSTALL SPECIFIED IMPROVEMENT AND TO
MAINTAIN A SAFE WORK ZONE. THE CONTRACTOR IS RESPONSIBLE FOR MAINTAINING A SAFE WORK ZONE
AND COMPLYING WITH THE PROVISIONS OF TITLE 296 WASHINGTON ADMINISTRATIVE CODE (WAC), PART N,
"EXCAVATION, TRENCHING AND SHORING."
2. FILL PLACED ON OR ADJACENT TO SLOPES SHALL BE PLACED ON HORIZONTAL BENCHES CUT INTO THE
EXISTING SLOPE.
3. BENCHES SHALL EXTEND A MINIMUM OF 2-FEET HORIZONTALLY INTO THE SLOPE AND MAY BE CUT IN
STAGES AS THE FILL PROGRESSES.
C. FILL PLACEMENT AND COMPACTION
1. FILL MATERIAL SHALL BE PLACED IN LOOSE LIFTS NOT EXCEEDING 12-INCHES AND COMPACTED USING
EQUIPMENT DESIGNED FOR SOIL COMPACTION.
2. FILL SHALL BE UNIFORMLY COMPACTED TO A MINIMUM 90 PERCENT OF MAXIMUM DRY DENSITY (MDD) AS
DETERMINED BY ASTM D-1557.
D. SITE REVEGETATION
1. TOPSOIL SHALL BE LOOSELY PLACED ABOVE THE RIVERBANK FILL TO A DEPTH OF 12 INCHES. THE
FINISH GRADE SHALL BE TAMPED FIRM AND PROTECTED FROM EROSION.
2. THE EROSION CONTROL BLANKET SHALL BE SHINGLED OR PLACED IN A MANNER SUCH THAT RIVER
FLOWS AND WIND DO NOT PEEL UP THE FABRIC. THE EROSION CONTROL FABRIC SHALL BE ANCHORED
FOLLOWING THE MANUFACTURER'S INSTRUCTION.
3. NATIVE PLANTS, IDENTIFIED IN THE PLANT SCHEDULE, SHALL BE INSTALLED FOLLOWING THE LAYOUT
PROVIDED BY THE GEOENGINEERS BIOLOGIST. PLANTS SHALL BE INSTALLED THROUGH THE EROSION
CONTROL FABRIC BY CUTTING THE FABRIC TO THE MINIMUM NECESSARY TO INSTALL THE PLANTS.
E. SITE MAINTENANCE AND MONITORING
1. THE SITE WILL BE MAINTAINED BY THE OWNER INTO PERPETUITY AND IN COMPLIANCE WITH THE
PROJECT PERMITS.
2. THE SITE WILL BE MONITORED FOR A PERIOD OF FIVE YEARS FOLLOWING PLANT INSTALLATION AS
SPECIFIED IN THE DESIGN AND ANALYSIS REPORT BY GEOENGINEERS OR AS REQUIRED BY THE PROJECT
PERMITS.
ANTICIPATED MATERIAL SCHEDULE
APPROXIMATELY 420 YD3 OF CUT AND FILL:
• -160 YD3 OF NATIVE MATERIAL TO REMAIN ON SITE.
• ' 160 YD3 OF IMPORTED RIVERBANK FILL.
• -96 YD3 OF IMPORTED TOPSOIL.
• -3 YD3 OF 1-INCH DRAIN ROCK.
• -1 YD3 OF IMPORTED OUTFALL PROTECTION.
L/S oo3Z
GEOENGINEERS.
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE SOUTH
TUKWILA, WASHINGTON
NOTES AND SPECIFICATIONS
SHEET
2
0
PA21\21495001\00\CAD\21495001-01 FINAL DESIGN SNEETB.DWD\TAB:PLAN VIEW MODIFIED Br TMICNAW ON JUr 10, 2016 - 14:52
OHWM
--------
ASPHALT --- - -- -
100' WIDE TYPOS RIVER BUFFER &
URBAN CONSERVANCY BUFFER
COMMERCIAL BUILDING
LEGEND
STONE BENCH
GREEN RIVER
OHWM
EL=10.0'
OHWM
/
STONE BENCH
PLAN VIEW
SCALE: 1 "=10'
SCALE
10 0 10
FEET
k ON
OUTLET DRAIN
(TYP.)
BOTTOM OF FILL SLOPE
OHWM
x
DRAIN •
PIPE
S
SILT FENCE
k
ASPHA\-T
TN 1 �� �' 1RA1L =!
TOP OF FILL SLOPE B-2
LIMITS OF WORK
PARKING LOT
ictvks€4
cow — OHWM
TOP OF
EXISTING SLOPE
oHwM
PROTECT TREES PER
TREE PROTECTION DETAIL
(SEE SHEET 5)
L - o3z-
GEOENGINEERS_..0
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE SOUTH
TUKWILA, WASHINGTON
SITE PLAN
SHEET
3
0
1
CTIONS MODIFIED BY TMICHAUD ON JUN 10, 2016 - I
P:\21\21493001\00\CAD\21493001-01 FINAL DESIGN SNEETS.DW
24" SYCAMORE
(PROTECT TREE PER
GEOENGINEERS)
PARKING LOT
30" SYCAMORE
(PROTECT TREE PER
GEOENGINEERS)
PARKING LOT
1.77,- LANDWARD LIMITS OR WORK
1 EXISTING
1 H- ASPHALT
TRAIL
N
SEE ANCHOR TRENCH DETAIL
CUT AS REQUIRED FOR SAFETY AND STABILITY
TOP SOIL ,- EXISTING GRADE
2%
RIVERBANK FILL
NATIVE VEGETATION (TYP.)
EROSION CONTROL FABRIC
SEE DRAIN DETAIL -J OUTLET DRAIN -
SECTION
SEE ANCHOR TRENCH DETAIL
40' TRAIL EASEMENT (APPROXIMATE)
A
HORIZONTAL SCALE: 1"=5'
VERTICAL SCALE: 1' 5'
1177,- LANDWARD
1
1
SEE ANCHOR TRENCH DETAIL
LIMITS OR WORK
EXISTING
ASPHALT
TRAIL
CUT AS REQUIRED FOR SAFETY AND STABILITY _/)\.
SCALE SECTION
5 5
FEET
SEE DRAIN DETAIL
3
OUTFALL PROTECTION PER
MATERIAL NOTE C-2
BASE FLOOD ELEVATION
SILT FENCE
(WATERWARD LIMITS
OF WORK)
OHWM
NATIVE VEGETATION (TYP.)
EXISTING GRADE
TOP SOIL
2%
RIVERBANK FILL
EROSION CONTROL FABRIC
BASE FLOOD ELEVATION
OUTFALL PROTECTION PER
• 2.5 MATERIAL NOTE C-2
SEE ANCHOR TRENCH DETAIL
40' TRAIL EASEMENT (APPROXIMATE)
B
HORIZONTAL SCALE: 1"=5'
VERTICAL SCALE: 1"=5'
3
SILT FENCE
(WATERWARD LIMITS
OF WORK)
OHWM
L l5' - Qa3�
GEOENGINEERS
t
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE SOUTH
TUKWILA, WASHINGTON
CROSS -SECTIONS AND DRAIN DETAIL
SHEET
4
0
IED BY TmICHAUD ON JUN 10, 2016 - 1
D\TAB:DETAILS moo
\21\21493001\00\LAD\21495001-01 Fi
RIVERBANK FILL
DRAINAGE ROCK PER
WSDOT STANDARD
SPECIFICATION 9-03.12(4)
4" SCH40 PERFORATED
PVC DRAIN PIPE
DRAIN DETAIL
NON —WOVEN GEOTEXTILE
SOLID 5CH40 PVC
OUTLET DRAIN
NCT TC SCALE
MIN. —
1' MIN.
TAMPED TAMPED SOIL
EROSION CONTROL MAT
FASTENER
FASTENER —
4' MAX. CENTERS
ANCHOR TRENCH SCHEDULE
NOT TO SCALE
Estimated
Quantity
1
1
p
•
SILT FENCE DETAIL
N::T TL' SCALE
Recommended Planting Schedule
Common Name Scientific Name Site Spacing
12 Black cottonwood Popuius balsamo'era 6 - 8 feet in height 10 feet o.c.
14 Western red cedar Thuja plicate 6 - 8 feet in height 10 feet o c
12 Big leaf maple Acer macrophytum 6 - 8 feet m height 10 feet o.c.
12 Pacific dogwood Cornus nutafi 6 - 8 feet in height 10 feet o.c.
40 Vine ma* Acer circinatum 6 - 8 feat in height 5 feet o.c.
40 0ceanspray Hoiodeecus discolor 24—inch in height 5 feet o c
40 Snowberry Sympnoricarpos albus 24—,nch in freight 5 feet o.c
40 Western sereceberry Ameiancheer alnidoa 24—inch in height 5 feet o c
40 Red war dogwood (.t#rlus sericea 24—nch in height 5 feet o.c
v7wv r -0, w
L W
w
yr wW,
PLANT SCHEDULE TYPICAL PLANTING DETAIL
1
.NF
STRAW WATTLE DETAIL
NET T... SCALE
4'-0" PLYWOOD
FENCE TO ENCLOSE
ENTIRE TREE
TREE PROTECTION DETAIL
L��S -ad3Z
GEOENGINEERS.g
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
DETAILS
SHEET
5
to
O
100' WIDE TYPOS RIVER BUFFER &
URBAN CONSERVANCY BUFFER
cowENC1AL BUILDING
LEGEND
13.1 4- BORING LOCATIONS*
— — —25-- — — EXISTING CONTOURS
PROPOSED BANK LINES
ONVAJ ORDINARY HIGH WATER MARK
LIMITS OF WORK
% SILT FENCE
OHWM
GREEN RIVER
EL=10.01
STONE BENCH •
24" SYCAMORE
\ ' I PARKING LOT
;.►,ate 10A-rims
oh5,,,,,ci .46
N BOTTc Al OF FILL SLOPE r SILT FENCE
• BORING LOGS PROVIDED IN ACCOMPANYING REPORT (GEOENGINEERS 2015)
VERTICAL DATUM: NAVDBB
PLAN VIEW
SCALE: 1"=10'
10
SCALE
e 10
BERT
A
PROTECT TREES PER
TREE PROTECTION DETAIL
(SEE SHEET 5)
REV
Description
Date
By
Chk
Rev
DESIGNED LJS
DRAWN TJM
DATE 06/03/16
FILE NO. 21093-001-01
CHECKED JMA
SCALE _5 NOTED
REVISED:
GEOENGINEERQ
600 Steeort Street, Suite 1700 P: 206-728-2674
Seattle. WA 98101 T: 206-728-2732
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE SOUTH
TUKWILA, WASHINGTON
SITE PLAN
SHEET
3
L/ 5 - cyd-? Z
STATE OF WASHINGTON
DEPARTMENT OF ECOLOGY
Northwest Regional Office • 3190 160th Ave SE • Bellevue, WA 98008-5452 • 425-649-7000
711 for Washington Re/ay Service • Persons with a speech disability can call 877-833-6341
August 28, 2015
Kurt Schneider
3200 North Central Ave, Suite 1470
Phoenix, AZ 85012
Re: City of Tukwila Permit L15-0032 - Approved
3200 North Central Ave, Suite 1470 - Applicant
Shoreline Substantial Development Permit (SDP) # 2015-NW-2957
Dear Mr. Schneider:
On August 27, 2015, the Department of Ecology (Ecology) received notice that the City of
Tukwila approved your application for an SDP. Your permit is to install a subsurface drainage
system and restore an eroded bank within shoreline jurisdiction of Green River.
By law, local governments must review all SDPs for compliance with:
• The Shoreline Management Act (Chapter 90.58 RCW);
• Ecology's SDP approval criteria (Chapter 173-27-150 WAC); and
• The City of Tukwila Local Shoreline Master Program.
Local governments, after reviewing SDPs for compliance, are required to submit them to
Ecology. Your approved SDP has been received by Ecology.
What Happens Next?
Before you begin activities authorized by this permit, the law requires you wait at least 21 days
from August 27, 2015, the "date of filing." This waiting period allows anyone (including you)
who disagrees with any aspect of this permit to appeal the decision to the state Shorelines
Hearings Board. You must wait for the conclusion of an appeal before you can begin the
activities authorized by this permit.
We recommend contacting the Shorelines Hearings Board at (360) 664-9160 before beginning
permit activities to ensure that no appeal has been filed. Information on appeals is also posted at
http://www.eluho.wa.gov/Decision/Search Cases. Select "Shorelines Hearings Board" from the
drop down menu labeled "Board" and enter "Search." The most current appeal will appear on
top.
If want to appeal this decision, you can find appeal instructions (Chapter 461-08 WAC) at
the Shorelines Hearings Board website above. They are also posted on the website of the
Washington State Legislature at: http://apps.leg.wa.gov/wac.
®
Kurt Schneider
August 28, 2015
Page 2 of 2
Other federal, state, and local permits may be required in addition to this shoreline permit.
If you have any questions about this letter, please contact David Pater at (425) 649-4253.
Sincer
avid Pater, Shoreline Specialist
Shorelands and Environmental Assistance Program
cc: Valerie Lonneman, Tukwila Community Development
Thomas Bannister, GeoEngineers, Inc.
r\
City of Tukwila
Department of Community Development
August 24, 2015
NOTICE OF DECISION
SHORELINE MANAGEMENT ACT OF 1971
PERMIT FOR SHORELINE SUBSTANTIAL DEVELOPMENT
TO: Thomas Bannister, GeoEngineers (Applicant)
Kurt Schneider, Owner
King County Assessor, Accounting Division
Washington State Department of Ecology, NW Regional Office
Washington State Attorney General
Muckleshoot Indian Tribe
Duwamish Indian Tribe
Jim Haggerton, Mayor
Jack Pace, Director
This letter serves as a notice of decision and is issued pursuant to TMC 18.104.170 on the following project and permit
approval.
I. PROJECT INFORMATION
Project File Number: L15-0032; PL15-0027
Applicant:
Type of Permit:
Project Description:
Location:
Associated Files:
Comprehensive Plan
Designation/Zoning
District:
Thomas Bannister, GeoEngineers
Shoreline Substantial Development Permit
Install a subsurface drainage system and restore an eroded bank on the west bank of the
Green River. The parcel is generally flat and not leveed. The entire project site is within the
200 foot shoreline jurisdiction of the Green River and the work will be performed entirely
within the 100 foot river buffer. Work will not occur water ward of the Ordinary High
Water Mark (OHWM) as no evidence of toe erosion nor scour have been found on site.
14900 Interurban Ave S, Tukwila, WA 98168
E15-0007 — SEPA
Tukwila Urban Center —Transit Oriented Development (TUC-TOD)
6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone 206-431-3670 • Fax 206-431-3665
II. DECISION
SEPA Determination: SEPA Determination of Non -Significance was issued on August 17, 2015.
Decision on Substantive Permit: The City Community Development Director has determined that the application for a
Shoreline Substantial Development Permit does comply with applicable City and state code requirements and has
approved that application based on the findings and conclusions contained in the staff report.
The Decision on this Permit Application is a Type 2 decision pursuant to Tukwila Municipal Code § 1.8.104.010.
Other land use applications related to this project may still be pending.
This permit is granted pursuant to the Shoreline Management Act of 1971 and nothing in this permit shall excuse
the applicant from compliance with any other Federal, State or local statues, ordinances or regulations applicable to
this project, but not inconsistent with the Shoreline Management Act (Chapter 90.58 RCW).
This permit may be rescinded pursuant to RCW 90.58.140(8) in the event the permittee fails to comply with the
project as approved and any conditions thereof.
CONSTRUCTION PURSUANT TO THIS PERMIT MAY NOT BEGIN AND IS NOT AUTHORIZED
UNTIL TWENTY-ONE (21) DAYS FROM THE DATE OF RECEIPT WITH THE DEPARTMENT OF
ECOLOGY AS DEFINED IN RCW 90.58.140(6) AND WAC 173-14-090, OR UNTIL ALL REVIEW
PROCEEDINGS INITIATED WITHIN TWENTY-ONE (21) DAYS FROM THE DATE OF SUCH FILING
HAVE TERMINATED; EXCEPT AS PROVIDED IN RCW 90.58.140(5)(a)(b)(c).
Construction must begin within 2 years from the effective date of the permit and be substantially completed
within 5 years of the effective date of the permit. The effective date of a substantial development permit
shall be the date of receipt as provided in RCW 90.58.140(6).
III. YOUR APPEAL RIGHTS
One administrative appeal to the Shorelines Hearings Board of the Decision is permitted. Any person appealing to the
Shorelines Hearings Board may raise certain SEPA issues as part of the appeal to the Shorelines Hearings Board.
Appellants should consult the rules and procedures of the Shorelines Hearings Board for details.
IV. PROCEDURES AND TIME FOR APPEALING
The requirements and procedures for appeals to the Shorelines Hearings Board are set forth in RCW 90.58 and
WAC 461.08.
Pursuant to RCW 90.58.180 the decision by the City of Tukwila to issue this Shoreline Substantial Development
Permit may only be appealed to the Shoreline Hearings Board. Appeals must be filed with the Shoreline Hearings
Board within 21-days from the filing of this permit with the Department of Ecology as defined in RCW 90.58.140.
For more detailed information on appeals, refer to RCW 90.58 and WAC 461.08.
V. INSPECTION OF INFORMATION ON THE APPLICATION
Project materials including the application, any staff reports, and other studies related to the Shoreline Substantial
Development Permit are available for inspection at the Tukwila Department of Community Development, 6300
VL Page 2 of 3 8/24/2015
W:\Users\Valerie\Notice of Decision\L15-0032 Shoreline NOD
Southcenter Blvd., Suite 100, Tukwila, Washington 98188 from Monday through Friday between 8:30 a.m. and 5:00
p.m. The project planner is Valerie Lonneman, who may be contacted at 206-433-7140 for further information.
Property owners affected by this decision may request a change in valuation for their property tax purposes. Contact the
King County Assessor's Office for further information regarding property tax valuation changes. The notice board must
be removed at the expiration of the appeal period unless an appeal is filed.
bf
Jack Pac . erector
Departma4 t of Community Development
City of Tukwila
VL Page 3 of 3 8/24/2015
W:\Users\Valerie\Notice of Decision\L15-0032 Shoreline NOD
i
,
City of Tukwila
Jim Haggerton, Mayor
Department of Community Development Jack Pace, Director
STAFF REPORT
SHORELINE SUBSTANTIAL DEVELOPMENT
I. SUMMARY OF PROPOSED ACTION
The proposed project is to install a subsurface drainage system and restore an eroded bank on the west
bank of the Green River at 14900 Interurban Ave. South.
II. GENERAL INFORMATION
Project Name: Green River Bank Erosion Repair
File Numbers: L15-0032; PL15-0027
Associated Permits: E15-0007 SEPA
Applicant: Thomas Bannister, GeoEngineers
Location: 14900 Interurban Ave. South (APN#3597000006).
Zoning: Regional Commercial Mixed Use (RCM)
Comprehensive
Plan Designation: RCM
SEPA Determination: Determination of Non -Significance issued on August 17, 2015.
Attachments:
A. Complete Plans (Vicinity Map and Site Map 1, Notes and Specifications 2,
Site Plan 3, Cross -Sections and Drain Detail 4, Details 5)
B. Revised Analysis and Design Report prepared by GeoEngineers on June 18,
2015
C. Pedestrian Access Easement
D. August 17, 2015 SEPA Determination of Nonsignificance
6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone 206-431-3670 • Fax: 206-431-3665
L15-0032-Green River Bank Erosion Repair
Shoreline Substantial Development
August 24, 2015
III. PROJECT DESCRIPTION
The proposed project is to install a subsurface drainage system and restore an eroded bank on the west
bank of the Green River at 14900 Interurban Ave. South. A Shoreline Substantial Development permit
is required for the proposed project and SEPA (State Environmental Policy Act) determination of non -
significance was issued on August 17, 2015. The entire project site is within the 200 foot shoreline
jurisdiction of the Green River and the work will be performed entirely within the 100 foot river buffer
(see Site Plan in Attachment A).
The project design statement sates that the proposed work will mitigate for ongoing bank sloughing
and address potential future drawdown failures, which are believed to be the primary cause of bank
sloughing at that location. Work will not occur waterward of the Ordinary High Water Mark (OHWM)
as no evidence of toe erosion nor scour have been found on site.
A more detailed description of the riverbank drainage provided in the Revised Analysis and Design
Report (Attachment B) states "the project consists of installing a subsurface gravity drainage system to
transport water away from the failure plane and rebuilding the riverbank using a combination of
structural fill and native soil." The following aerial photo illustrates the location of the project parcel,
which includes an approximately 57,000 square foot, two-story office building and adjacent parking
areas. The parcel is generally flat and not leveed.
Figure 1 — Project Site
VL Page 2 of 13 08/24/2015
W:\Users\Valerie\Shoreline\L15-0032 SR
/ l 1
L15-0032-Green River Bank Erosion Repair
Shoreline Substantial Development
August 24, 2015
IV. TUKWILA SHORELINE MASTER PROGRAM — BACKGROUND
The City of Tukwila adopted a new Shoreline Master Program (SMP) on August 15, 2011.which was
approved by the Washington State Department of Ecology on October 14, 2011 and became effective
October 28, 2011. This project is subject to the new Shoreline Master Program.
A. Shoreline Environment Designation
The shoreline environment designation for the site is Urban Conservancy; the purpose of the Urban
Conservancy Environment is to protect ecological functions where they exist in urban and developed
settings, and restore ecological functions where they have been previously degraded, while allowing a
variety of compatible uses.
The shoreline buffer in the Urban Conservancy environment is 100 feet from the ordinary high water
mark, when the river bank is not fortified with a levee. All proposed work will fall within the 100'
shoreline buffer. Shoreline restoration projects are a permitted use within the shoreline buffer in the
Urban Conservancy Environment. Figure 2 depicts the Shoreline Environmental Designation for this
reach of the Duwamish River.
.�-+.Ordinary Hipp Water Mark
( -.. ] Aquatic Environment
- High Intensity -100' Buller
High
pm Intensity - Outside Butter — Type 3 Stream (80' Buffer)
L!» o UrbanConservancy - Levee -125' Buffer ® Type 3 Stream in Pipe
no
Urban Conservancy - Levee - Outside Buffet — Type 4 Stream (50' Buffer)
Urban Conservancy - No levee -100' Buffer Type 4 Stream In Pipe
Urban Conservancy - No Levee - Outside Buffer 17771 Fish and WIl41fe Habitat Areas (100' Buffer)
Shoreline Residential - Min. 50' Buffer Potential Wetlands
SBorekne Residential - Outside Buffer - Category II Wetland (100' Butter)
Tukwila City Limits t Category Ig Wetland (80' Buffer'
saltPotental Annexation Area Category IV Wetland (50' Buffer)
Figure 2 — Shoreline Environment Designation map
Type 2 Stream (100' Buffer)
ro Type 2 Stream in Pipe
e 1 d00'
leafing 0H/q
vegan mina locations
tiff apprortaate oily.
Witenarxs slain re
gas napkin no
Cenisaneye4.
21
VL Page 3 of 13 08/24/2015
W:\Users\Valerie\Shoreline\L15-0032 SR
i
L15-0032-Green River Bank Erosion Repair
Shoreline Substantial Development
August 24, 2015
B. Shoreline Goals and Policies:
The following section discusses the Shoreline Master Program (SMP) goals and policies that apply to
this project and are excerpted from Chapter 6 of the City's SMP.
6.6 Access and Recreational Use, Comprehensive Plan Goal 5.6
Goal: Increase the amount and diversity of opportunities for public recreation and access to and along
the river, including visual and cultural access, access to the water's edge, opportunities for small boat
navigation and access, and connections to other neighborhoods, consistent with the shoreline character.
• Policy 5.6.3: Incorporate river access requirements to guide the design, location and
management of shoreline public access in short plats over 4 lots and all subdivisions as well as
multi -family, commercial and industrial development; to identify types of access appropriate
and feasible for various site conditions and locations; and to establish strategies, funding
sources and priorities for acquisition and enhancement of shoreline public access.
• Policy 5.6.5: Where shoreline development provides public access areas, reserve such areas for
use by the public through the means most appropriate for the type, scale and impacts of the
development, such as dedication, donation or sale of an easement or right-of-way to the City.
Staff Response: There is an existing perpetual, non-exclusive easement for public access on the site,
which is currently paved as a recreational trail. (See Attachment C).
6.7 Transportation within the Shoreline Jurisdiction, Comprehensive Plan Goal 5.7
Goal: Safe corridors and amenities for pedestrians, cyclists and users of public transportation, allowing
more citizens to access and enjoy the river.
• Policy 5.7.2: Ensure the transportation uses within the shoreline jurisdiction and within those
corridors identified as river cross -connections provide safe, convenient and attractive
pedestrian, bicycle and boater access and facilities for public transportation.
• Policy 5.7.3: Minimize transportation impacts to the natural environment (such as air, noise,
odor or water pollution) and enhance the natural environment wherever possible through
planting trees and other habitat features.
Staff Response: The proposed restoration work will stabilize the river embankment, enhancing the
stability of the public trail that provides riverside views„ The project will enhance the natural
environment through mitigation plantings, which will minimize the transportation impacts to the
adjacent riparian environment.
VL Page 4 of 13 08/24/2015
W:\Users\Valerie\Shoreline\L15-0032 SR
f
f \
L15-0032-Green River Bank Erosion Repair
Shoreline Substantial Development
August 24, 2015
6.9 Natural Environment and Habitat Use, Comprehensive Plan Goal 5.9
Goal: Restored, enhanced, and protected natural environment resources along the river, including trees,
wildlife habitat and features with value for long-term public, scientific, and educational uses.
• Policy 5.9.1: Ensure that shoreline development results in no net loss of shoreline
ecological function, minimizes impacts on wildlife and that significant vegetation,
sandbars, wetlands, watercourses, and other critical areas identified as important for habitat
are maintained through the proper location, design, construction, and management of all
shoreline uses and activities.
• Policy 5.9.2: Ensure that shoreline development and activities protect riverbank vegetation
and, where feasible, restore degraded riverbanks in accordance with the vegetation
management provisions of the Shoreline Master Program, in order to minimize and
compensate for impacts to fish and wildlife habitat.
Staff Response: The proposed work will improve the shoreline ecological function by stabilizing the
river bank and thereby reducing potential erosion and sediment release into the river which can impact
water quality. Work will remove invasive species and densely revegetate the area with native shrubs
and trees, which will ultimately provide additional shade and organic input into the system. All work
will be in conformance with the regulations of the Shoreline Master Program and result in no net loss
of shoreline ecological functions.
6.10 Water Quality, Surface Water and Flood Control Use, Comprehensive Plan Goal 5.10
Goal: Improved water quality and quantity control programs affecting the Green/Duwamish River that
improve the river's water quality, provide habitat for fish.
• Policy 5.10.1: Design, locate, and manage shoreline development including streets, flood
control projects, surface water drainage and sewer systems, clearing and grading activities, and
landscaping in a manner which minimizes opportunities for pollutants to enter the river,
provides erosion control and otherwise protects water quality.
Staff Response: The proposed work involves the installation of a subsurface drainage system to
transport water away from the failure plane. The proposed work will reduce the potential for further
erosion, which adversely affects water quality. Best management practices for sediment and erosion
control will be applied in order to mitigate for any temporary impacts on water quality during earth -
moving activities.
6.11 Public Health, Safety and Welfare, Comprehensive Plan Goal 5.11
Goal: Shoreline uses that do not endanger public health, safety and welfare, or the capacity of the river
to provide long-term benefits and resources to the community.
VL Page 5 of 13 08/24/2015
W:\Users\Valerie\Shoreline\L15-0032 SR
L15-0032-Green River Bank Erosion Repair
Shoreline Substantial Development
August 24, 2015
• Policy 5.11.1: Design, locate, and manage shoreline uses, such as capital improvement projects
and private development, in a manner that does not endanger public health, safety and welfare,
and enhances the capacity of the river to provide long-term flood protection, habitat and other
benefits and resources to the community and the environment.
Staff Response: The project is within an area where Muckleshoot tribal members exercise their treaty
fishing rights. Currently there is no access to the river within the project site. However, the project site
is located approximately 150 feet north of an existing trail that is used by tribal member to access the
river for fishing. This trail will remain open during construction, parking will be available, and access
to the river via the trail will be unimpeded. It is anticipated that the restoration work may create better
access conditions and as a result more tribal members may set nets and fish in this area once the
project is complete.
6.12 Shoreline Use Preferences, New Comprehensive Plan Goal 5.12
Goal: Tukwila, in developing and implementing its shoreline master program for shorelines of
statewide significance, including the Green/Duwamish River, shall give preference to uses in the
following order of preference which:
1. Recognize and protect the statewide interest over local interest;
2. Preserve the natural character of the shoreline;
3. Result in long term over short term benefit;
4. Protect the resources and ecology of the shorelines;
5. Increase public access to publicly owned areas of the shorelines;
6. Increase recreational opportunities for the public in the shoreline;
7. Provide for any other element as defined in RCW 90.58.100 deemed appropriate or
necessary.
Staff Response: The proposed work will provide many of the benefits listed, including long term
environmental, social, aesthetic, and safety benefits.
V. SHORELINE REGULATIONS
TMC 18.44.130 B. 3. Shoreline Administration states that a substantial development permit shall be
granted only when the development proposed is consistent with the shoreline master program (SMP).
The relevant SMP policies were discussed above. Below is a discussion of the relevant shoreline
master program regulations that are incorporated into the zoning code that apply to this permit
application.
1. TMC 18.44.050 Permitted Uses
TMC 18.44.050 identifies permitted uses in the Urban Conservancy environment. The proposed
project is a permitted use under TMC 18.44.050 B.1.a.: "Shoreline restoration projects".
VL Page 6 of 13 08/24/2015
W:\Users\Valerie\Shoreline\L15-0032 SR
\
L15-0032-Green River Bank Erosion Repair
Shoreline Substantial Development
August 24, 2015
2. TMC 18.44.070 Development Standards
TMC 18.44.070 C. establishes development standards for the Urban Conservancy
Environment. These include setbacks, site configuration, height restrictions, and lighting
standards. As this project does not involve the construction of structures, setbacks, site
configuration, and height restrictions do not apply.
TMC 18.44.070.D Surface Water and Water Quality
TMC 18.44.070 D. provides development standards for surface water and water quality related
to shoreline development.
The proposed project will not generate any increase in surface runoff. The project involves the
installation of a subsurface drainage system to transport water away from the failure plane,
which can be expected to improve water quality by decreasing the likelihood of erosion,
thereby improving water quality at the site.
Projects are required to be designed so as to cause no net loss to shoreline ecological functions.
No net loss has been addressed above under the discussion of the consistency of this project
with shoreline goals and policies.
18.44.070.E Flood Hazard Reduction
TMC 18.44.070 E. sets standards for structural flood hazard reduction structures. Not
applicable.
TMC 18.44.070. F Shoreline Stabilization
TMC 18.44.070 F. provides regulations for work intended to minimize or prevent failure of
riverbanks resulting from waves, tidal fluctuations, or river currents.
The Revised Analysis and Design Report (Attachment B) supports the use of bioengineering
techniques to protect the site from additional sloughing. The project will avoid all direct
impacts to the ecological processes of the shoreline. Any indirect impacts due to the earth
moving and invasive plant removal in the shoreline buffer will be mitigated through
appropriate sediment and erosion control BMPs.
TMC18.44.070.G Archaeological, Cultural, and Historical Resources
TMC 18.44.070 G. states regulations regarding coordination with affected tribes and
procedures for the discovery of archaeological resources.
Applicant will comply with all local, state, and federal laws in the event that archaeological or
paleontological artifacts are encountered. Notice of Application was sent to the Muckleshoot
and Duwamish Tribes.
VL Page 7 of 13 08/24/2015
W:\Users\Valerie\Shoreline\L15-0032 SR
L15-0032-Green River Bank Erosion Repair
Shoreline Substantial Development
August 24, 2015
TMC 19.44.070.H Environmental Impact Mitiigation
TMC 19.44.070 H. addresses the mitigation of unavoidable impacts on the shoreline to ensure
the "no net loss" standard is met.
The project will result in approximately 5,000 square feet of temporary impacts to the
shoreline. These impacts are necessary to eliminate the inherent public safety issue posed by
the slope failure and to maintain safe, public access to the shoreline on the property. To rectify
these unavoidable impacts, the project follows the mitigation sequencing steps identified in
TMC 18.44.070 H(3). By following this protocoll the project will result in no net loss of
shoreline ecological function.
TMC 19.44.070.I Off Street Parking and Loading Requirements
Not applicable.
TMC 19.44.070.J Land Altering Activities
TMC 18.44.070.J, Development Standards (Section 9.11 of the SMP) addresses clearing,
grading and landfill activities in the shoreline jurisdiction. The SMP requires all land altering
activities in the shoreline jurisdiction to be in conjunction with an underlying land development
permit, except for shoreline restoration projects. In addition, all activities shall meet the
following standards:
1. Land altering shall be permitted only where it meets the following criteria:
a. The work is the minimum necessary to accomplish an allowed shoreline use;
Response: Fill will be placed to approximate the pre -slough slope angle, or 2.5:1 slope.
No work will occur waterward of the OHWM so as to minimize impacts to the aquatic
habitat at the site.
b. Impacts to the natural environment are minimized and mitigated;
Response: The slope angle of the bank reconstruction will be established to fit within
the site constraints, including avoiding damage to the large sycamore trees atop the
bank, limiting disturbance to the root zone and transitioning into the native banks
adjacent to the repair. Tree protections will be established at the maximum practical
distance from the trunks of the seven mature sycamore trees along the top of the bank.
The site is currently infested with Himalayan blackberry, which will be removed and
revegetated with native species to help stabilize the bank.
c. Water quality, river flows and/or fish habitat are not adversely affected;
Response: Temporary erosion and sediment controls will be installed prior to site
work. A silt fence will be installed on the downslope construction limits, near the
OHWM, as the primary water quality protection. Contingency water quality protections
VL Page 8 of 13 08/24/2015
W:\Users\Valerie\Shoreline\L15.0032 SR
L15-0032-Green River Bank Erosion Repair
Shoreline Substantial Development
August 24, 2015
include additional silt fence, silt curtains, and straw wattles. Additional erosion
protection will be provided due to the potential for high flow events in the river by
including a biodegradable erosion control fabric, which will provide additional
stabilization to the bank during heavy rain events.
d. Public access and river navigation are not diminished;
Response: There is an existing perpetual, non-exclusive easement for public access on
the site, which is currently paved as a recreational trail. The escarpment damaged this
portion of the trail, which is now closed due to safety concerns. To accommodate the
proposed slope re -grading angle of 2.5:1 the trail may have to be realigned following
bank restoration.
e. The project complies with all federal and state requirements and the project has
been coordinated with the U.S. Army Corps of Engineers;
Response: The project has been designed to comply with all federal and state
requirements.
f. The project complies with the vegetation protection criteria of the Vegetation
Protection and Landscaping Section;
Response: The proposed project is compliant with the regulations for vegetation
protection and landscaping. See `Vegetation Protection and Landscaping' section,
below.
g. Documentation is provided to demonstrate that the fill comes from a clean source.
Response: The Revised Analysis and Design Report (Attachment B) states that
approximately 160 cubic yards of clean riverbank fill will be imported to supplement the
approximate 160 cubic yards of native material that will be incorporated back into the
riverbank.
It should be noted that the discussion on fill during development of the City's SMP
was focused on fill placed waterward of the ordinary high water mark, which this
project does not propose.
2. Clearing, grading and landfill activities, where allowed, shall include erosion control
mechanisms, and any reasonable restriction on equipment, methods or timing necessary
to minimize the introduction of suspended solids or leaching of contaminants into the
river, or the disturbance of wildlife or fish habitats in accordance with the standards in
the Grading Chapter, TMC 16.54.
Response: Best Management Practices, such as silt fence, silt curtains, and straw
wattles, will be installed before any earthmoving activities take place and will be
maintained throughout construction in order to prevent sediment from entering the
Green River.
TMC 19.44.070.K Marinas, Boat Yards, Dry Docks, Boat Launches, Piers, Docks, and
Over -water Structures
VL Page 9 of 13 08/24/2015
W:\Users\Valerie\Shoreline\L15-0032 SR
L15-0032-Green River Bank Erosion Repair
Shoreline Substantial Development
August 24, 2015
Not applicable.
TMC 19.44.070.L Signs in the Shoreline Jurisdiction
Not applicable.
3. TMC 18.44.080 Vegetation Protection and Landscaping
TMC 18.44.080 provides requirements for landscaping in both the buffer and non -buffer areas of the
shoreline environment. Invasive vegetation shall be removed as part of site preparation and
maintenance will include physical removal of noxious and invasive species that may be detrimental to
the restored riparian habitat along the riverbank. Seven large Sycamore trees along the top slope of the
bank shall be retained and protected during construction. The contractor shall establish tree protections
at the maximum practical distance from the trunks of the Sycamore trees and a GeoEngineers biologist
will be on site to observe grading activities in the vicinity of the trees.
The applicant has provided a landscaping schedule for the project area, which is comprised entirely of
native plants. Plant size and spacing is in accordance with the regulations for the shoreline jurisdiction.
The landscaping plan also complies with the provisions for areas in the river buffer, as the entire site is
within the buffer. Plants will be installed in such a way to promote shade and overhanging vegetation
near the OHWM. The landscaping plan accounts for seasonal fluctuation in river levels and variable
hydrology up the riverbank slope. GeoEngineers has recommended that landscaping be watered during
the dry season for a minimum of three years following installation either by hose or with a temporary
irrigation system.
Per TMC 18.44.080.C.1.1. and m. applicant shall ensure the following requirements are met:
1) Site preparation and planting of vegetation shall be in accordance with best management
practices for ensuring the vegetation's long-term health and survival.
2) Native vegetation in the shoreline installed in accordance with the preceding standards shall be
maintained by the property owner to promote healthy growth and prevent establishment of
invasive species. Invasive plants (such as blackberry, ivy, knotweed, bindweed) shall be
removed on a regular basis, according to the approved maintenance plan.
To ensure these standards are met, applicant shall submit a five year maintenance and monitoring plan
prior to construction. The maintenance plan shall cover the following areas:
a) Establishment of a permanent transect that is at least 100ft long that covers both the upper
and lower ranges of the slope (runs diagonally). Photo points of the site shall be included in
annual reports.
b) Success standards for the mitigation site shall include a 100% survival rate after the first
year, and positive growth of tree cover with at least 50% woody plant cover by year 5. The
site shall also be monitored to ensure less than 10% weed cover in all years. If monitoring
should suggest plantings are not meeting standards, appropriate contingency measures will
be implemented such as replanting and/or weed control.
VL Page 10 of 13 08/24/2015
W:\Users\Valerie\Shoreline\L15-0032 SR
r.
�\
L15-0032-Green River Bank Erosion Repair
Shoreline Substantial Development
August 24, 2015
c) Provision of irrigation for the first three growing seasons during the dry months (June —
October) as needed.
d) Annual monitoring reports to be submitted to the city by December 31 of each year for the
five years following installation.
4. 18.44.100 Public Access
TMC 18.44.100 addresses public access requirement for the SMP. Public access is required when a
development or use would create additional demand for public access through the addition of square
footage to an existing building or the intensification in land use through the conversion of a warehouse
to a retail or office use. This development standard does not apply to this project. There is an existing
public trail which has been closed in this area due to safety concerns after a portion of the trail was
undercut by the sloughing bank.(Attachment C).
5. TMC 18.44.110 Shoreline Design Guidelines
This section of the TMC does not apply as no structures are being constructed.
VI. COMMENTS
Notice was sent to property owners and tenants within 500' of the site and agencies with jurisdiction.
No comments were received from the general public regarding the proposed work.
Comments were received from the Muckleshoot Indian Tribe, stating that the project site is an area
where Muckleshoot tribal members exercise their treaty fishing rights and that therefore the contractor
must ensure that Tribe members will continue to have access to the Green River during construction.
Comments also noted that an increase in fishing in that area is a likely outcome of the project work, as
the project may create better river access. The Muckleshoot Tribe also requested to be sent the as -built
drawings and any monitoring reports generated by the project for their files.
These comments were forwarded to the applicant, who replied by stating that the area of proposed
work does not currently provide access to the river, but is located 150' north of the trail that is used by
tribal members for fishing. They confirmed that the work will not impede access to this area. As -built
plans shall be provided to the tribe upon project completion.
VII. SEPA
A SEPA Determination of Nonsignificance was issued on August 17, 2015. A copy of the SEPA
determination letter is provided as Attachment D.
VL Page 11 of 13 08/24/2015
W:\Users\Valerie\Shoreline\L15-0032 SR
L15-0032-Green River Bank Erosion Repair
Shoreline Substantial Development
August 24, 2015
CONCLUSIONS
1. The proposed project is located on the west bank of the Green River at 14900 Interurban Ave.
South. The entire project site is within the 200 foot shoreline jurisdiction of the Green River.
2. The shoreline environment designation for the project area is Urban Conservancy, with a buffer
width of 100 feet. The work will be performed entirely within the river buffer.
3. Shoreline restoration is a use permitted by the Urban Conservancy shoreline environment
designation.
4. The proposed project is to install a subsurface drainage system and restore an eroded bank,
which geotechnical analysis shows to be sloughing due to a drawdown failure.
5. The proposed project is consistent with the Access and Recreational Use, Natural Environment
and Habitat Use, Water Quality, Surface Water and Flood Control Use, Public Health, Safety
and Welfare, and Shoreline Use Preferences goals and policies of the SMP.
6. The project has analyzed the no net loss provisions of the SMP and will avoid all direct impacts
to the ecological processes of the shoreline. Any indirect impacts due to the earth moving and
invasive plant removal in the shoreline buffer will be mitigated to cause no net loss through
sediment and erosion control BMPs.
7. There are currently seven mature Sycamore trees along the top of the bank. The root systems
that support these trees will be protected during construction to the maximum extent practicable
due to the proximity of the trees to the project site. In the event of damage/death to the existing
trees, contingency mitigation measures will be applied.
8. In the application materials, the applicant has stated the mitigation plantings will be monitored
annually by a qualified biologist for the first 5 years. Success standards for the mitigation site
will include a 100% survival rate after the first year and an 80% survival rate annually
thereafter for 5 years.
9. TMC 18.44.080.C.1.1 requires the use of Best Management Practices for soil preparation,
planting, and site maintenance to ensure the vegetation's long-term health and survival. In
order to demonstrate these requirements will be met, the applicant shall submit a 5-year
maintenance and monitoring plan, which shall be approved by the City's Urban
Environmentalist.
10. The proposed project is consistent with the applicable development standards of the SMP:
a) Surface Water and Water Quality: the project will follow the 2009 King County Surface
Water Design Manual.
b) Shoreline Stabilization: Bioengineering techniques are recommended to protect the site
from additional sloughing. The project will avoid all direct impacts to the ecological processes
of the shoreline. Any indirect impacts due to the earth moving and invasive plant removal in
the shoreline buffer will be mitigated through appropriate sediment and erosion control BMPs.
c) Archaeological, Cultural, and Historical Resources: Applicant will comply with all local,
state, and federal laws in the event that archaeological or paleontological artifacts are
encountered.
d) Environmental Impact Mitigation: The project will result in approximately 5,000 square feet
of temporary impacts to the shoreline. To rectify these unavoidable impacts, the project will
follow the mitigation sequencing steps identified in TMC 18.44.070 H(3).
e) Land Altering Activities: The work is the minimum needed to accomplish an allowed
shoreline use; the impacts have been minimized and mitigated; water quality, river flows and
VL Page 12 of 13 08/24/2015
W:\Users\Valerie\Shoreline\L15-0032 SR
l
L15-0032-Green River Bank Erosion Repair
Shoreline Substantial Development
August 24, 2015
fish habitat shall not be adversely affected; public access and river navigation are not affected;
the project has been designed to comply with all state and federal requirements; the fill
complies with the vegetation protection criteria of the SMP; the fill source has not been
determined; and best management practices will be utilized during the earth moving work.
11. Comments were received from the Muckleshoot Indian Tribe and have been addressed. As -
built plans shall be sent to the tribe upon completion of the project.
12. A SEPA Determination of Nonsignificance was issued on August 17, 2015.
VIII. RECOMMENDATION
Approve the shoreline substantial development permit with the following conditions:
1. Prior to construction, submit a five year maintenance and monitoring plan covering the
following areas:
a) Establishment of a permanent transect that is at least 100ft long that covers both the upper
and lower ranges of the slope (runs diagonally). Photo points of the site shall be included in
annual reports.
b) Success standards for the mitigation site shall include a 100% survival rate after the first
year, and positive growth of tree cover with at least 50% woody plant cover by year 5. The
site shall also be monitored to ensure less than 10% weed cover in all years. If monitoring
should suggest plantings are not meeting standards, appropriate contingency measures will
be implemented such as replanting and/or weed control.
c) Provision of irrigation for the first three growing seasons during the dry months (June —
October) as needed.
d) Annual monitoring reports to be submitted to the city by December 31 of each year for the
five years following installation.
VL Page 13 of 13 08/24/2015
W:\Users\Valerie\Shoreline\L15-0032 SR
at* al J uP'.ui&a ,
Department Of Community Development
AFFIDAVIT OF DISTRIBUTION
I, Valerie Lonneman, HEREBY DECLARE THAT:
Notice of Application
X
Notice of Decision
Notice of Public Hearing
Notice of Public Meeting
Determination of Non-
Significance
Mitigated Determination of Non -
Significance
Determination of
Significance & Scoping
Notice
Short Subdivision Agenda
Notice of Application for
Shoreline Mgmt Permit
Shoreline Mgmt Permit
Board of Appeals Agenda
Packet
Board of Adjustment Agenda Packet
Official Notice
Notice of Action
Was mailed to each of the addresses listed/attached
on this 24 day of August, 2015
Project Name: Green River Bank Erosion Repair
Project Number: L15-0032 (Shoreline)
Associated File Number (s): E15-0007 (SEPA)
Mailing requested by: Valerie Lonneman
Mailer's signature: /�
W:\USERS\VALERIE\AFFIDAVIT OF DISTRIBUTION.DOC
laura.murphy@muckleshoot.nsn.us, Muckleshoot Tribe
Karen.Walter@rnuckleshoot.nsn.us, Muckleshoot Tribe
mike.middleton@muckleshoot.nsn.us, Muckleshoot Tribe
james@duwamishcleanup.org, Duwamish Tribe
Christie.Most@kingcounty.gov, King County Assessor's Office
Larry.Fisher@diw.wa.gov, WA Dept. of Fish and Wildlife
tbannister@geoengineers.com, Thomas Bannister, Applicant
W:\USERS\VALERIE\AFFIDAVIT OF DISTRIBUTION.DOC
GEOENGINEERS
_,0
Letter of Transmittal
Plaza 600 Building, 600 Stewart Street, Suite 1700, Seattle, Washington 98101, Telephone: 206.728.2674, Fax 206.728.2732 www.geoengineers.com
To: Valerie Lonneman
City of Tukwila
Department of Community Development
6300 Southcenter Boulevard
Tukwila, Washington 98188
Regarding: Green River Bank Erosion Repair
We are sending: ® Attached
Date: August 6, 2015
File: 21493-001-01
❑ Under Separate Cover
Copies
Date
Description
2
7/14/15
Correction Letter # 1
2
8/6/15
Revision Submittal Form
2
7/30/15
Memorandum in response to Correction Letter #1
2
7/30/15
SEPA Application
2
7/30/15
Revised Analysis and Design Report
These are transmitted as checked below:
❑ For Your Use
As Requested
❑ Returned
0 For Review and Comment ❑ Other (see remarks)
We are sending via:
0 US Mail ❑ Overnight ® Courier
Remarks:
Copy To:
ram+
AUG 062015
cornrnutty
Development
Signed:
T omas Bann' -r
tbannister@geoengineers.co
DISCLAIMER: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided,
original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record.
d any attachments are only a copy of the
City () Tukwila
REVISION SUBMITTAL
Department of Community Development
PLANNING DIVISION
6300 Southcenter Boulevard, Suite #100
Tukwila, Washington 98188
Phone: 206-431-3670
AUG 062615
CoTmunity
Dev6opment
Revision submittals must be submitted in person at the Permit Center,
ACCOMPANIED BY RESPONSE DOCUMENTS AND THIS COMPLETED FORM.
Revisions will not be accepted through the mail, email, fax, etc.
Date: 8/6/2015 Permit Number: L15-0032 & E15-0007
Project Name: Green River Bank Erosion Repair
Project Address: 14900 Interurban Ave S.
Project Contact: Thomas Bannister Contact Phone number: (206) 728-2674
City Planner: Valerie Lonneman
PLEASE ATTACH A COPY OF ANY LETTER REQUESTING CORRECTIONS / ADDITIONAL INFORMATION
Response to Preliminary Approval
Response to letter requesting additional information (Please attach a copy of the letter)
Final Short Plat Submittal
Summary of revision/response submittal:
The applicant is providing a response memorandum to address comments received from the City of Tukwila in
Correction Letter #1. The project design report and SEPA checklist have been revised and resubmitted based on the
comments from the City.
Received at the City of Tukwila Permit Center by:
❑ Entered in TRAKiT on
C:\Users\breinke\AppData\Local\Microsoft\Windows\NetCache\Content.Outlook\81R3103M\L15-0032 Revision Submittal Form.doc
Revised: March 2014
r1
GEOENGINEERS_
0
Memorandum
Plaza 600 Building, 600 Stewart Street, Suite 1700, Seattle, Washington 98101, Telephone: 206.728.2674, Fax: 206.728.2732 www.geoengineers.com
To: Valerie Lonneman, City of Tukwila Assistant Planner �," \' ry,:
From: Thomas Bannister and Jon Ambrose, GeoEngineers u "
"
CC: Kurt Schneider, LD Schneider and Associates Nt6 d
Date: July 30, 2015 Commun1ent
peveiop
GEI File: 21493-001-01
Subject: Response to Correction Letter #1; L15-0032, E15-0007
The purpose of this memorandum is to provide responses to the City of Tukwila's (City) Correction Letter #1,
dated July 14, 2015. The City sent Correction Letter #1 to Thomas Bannister requesting additional information
regarding LD Schneider's Green River Bank Erosion Repair project located at 14900 Interurban Avenue in
Tukwila, Washington. The City's Correction Letter #1 includes comments from Dave McPherson of the Public
Works Department and Valerie Lonneman of the Planning Department.
Below are our responses to the City's comments:
Public Works - Dave McPherson
1. State Environmental Policy Act (SEPA) (E15-0007) - GeoEngineers revised the SEPA Checklist per
Dave McPherson's comments.
2. Shoreline (L15-0032)
a. GeoEngineers recognizes that the USGS identifies the Green River at the site as tidally influenced
and we have revised the design report accordingly.
b. The existing asphalt trail has been damaged from slope failure and is currently closed. No changes
to the existing trail are proposed as part of this project. Under an existing easement with
LD Schneider, the City agreed to maintain the trail within 40 feet of the Ordinary High Water Mark
of the Green River. This easement agreement is attached to the GeoEngineers Design Report.
Because the existing trail is located at the top of the bank and at the landward limits allowed by
the easement, future trail realignment is not likely. Following bank grading, the trail may be
reinstalled in a similar alignment and surfaced with gravel or asphalt.
Planning - Valerie Lonneman
1. SEPA (E15-0007)
c. The project will require the following materials:
i. Approximately 160 cubic yards of native material will be excavated, stockpiled and
returned to the riverbank following installation of the proposed drainage system.
ii. Approximately 160 cubic yards of clean river bank fill, as specified on Sheet 2 of the revised
project designs, will be acquired from a local aggregate source.
iii. Approximately 96 cubic yards of topsoil for planting medium, as specified on Sheet 2 of
the revised project designs, will be acquired from a local supplier.
Memorandum to City of TuL ,a
July 30, 2015
Page 2
iv. Approximately 3 cubic yards of washed and clean drainrock, as specified on Sheet 2 of the
project designs, will be acquired from a local aggregate source.
v. Approximately 1 cubic yard of quarry spalls as specified on Sheet 2 of the project designs,
will be acquired from a local aggregate source.
d. The existing asphalt trail has been damaged from slope failure and is currently closed. No changes
to the existing trail are proposed as part of this project. Under an existing easement with
LD Schneider, the City agreed to maintain the trail within 40 feet of the Ordinary High Water Mark
of the Green River. This easement agreement is attached to the GeoEngineers Design Report.
Because the existing trail is located at the top of the bank and at the landward limits allowed by
the easement, future trail realignment is not likely. Following bank grading, the trail may be
reinstalled in a similar alignment and surfaced with gravel or asphalt.
e. During construction, the contractor will install necessary erosion controls to prevent sediment from
entering the flow of the Green River. The project is located landward of ordinary high water mark
(OHWM) and no in -water work is proposed. Construction is scheduled to occur in September 2015
and river flow is expected to be very low with little risk of flow entering the work area. The contractor
will deploy necessary erosion and sediment controls in the event of rain during construction. If
necessary, the contractor will deploy additional contingency erosion controls, such as straw wattle
to comply with state water quality standards. We anticipate that a GeoEngineers Certified Erosion
and Sediment Control Lead (CESCL) will provide stormwater management guidance to the
contractor during construction. Turbidity in the Green River will be visually monitored during
construction. If the project results in a visible plume, the contractor will take immediate corrective
action by temporarily stopping earthwork activities and installing additional erosion controls. No
turbidity testing is proposed because discharge is not anticipated. Upon the completion of site
grading, the contractor will immediately install coir erosion control fabric intended to stabilize the
site until vegetation is restored to the bank.
f. No endangered plant species are known to occur near the site. Endangered Pacific Salmon occur
in the Green River as noted on Page 9 of the SEPA checklist.
2. Shoreline (L15-0032)
a. GeoEngineers recognizes that the USGS identifies the Green River at the site as tidally influenced
and we have revised our report accordingly.
b. The seven mature sycamore trees at the site are extremely valuable to the owner and they will be
protected during construction. Because of the lack of available space at the site, it is not possible
to protect the mature sycamore per City Code. The contractor will install construction fencing along
the landward edge of the work area, waterward of the seven existing sycamore tree following
guidance from GeoEngineers. If necessary, the contractor will install 4-foot tall plywood boxes
around the trunks of the sycamore trees. During site grading, the contractor will take care when
operating equipment in the vicinity of the trees. It is anticipated that the GeoEngineers biologist will
be on site observing grading activities in the vicinity of the trees.
c. The anticipated area to be revegetated is approximately 4,900 square feet. To restore native
riparian vegetation in this area, we recommend the following plant schedule:
Disclaimer: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/orfigure), if provided, and any attachments are only a copy of the
original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record.
/1
Memorandum to City of TulkN.-a
July 30, 2015
Page 3
Estimated
Quantity
12
14
12
12
40
40
40
40
40
d.
Common Name
Black cottonwood
Western red cedar
Big leaf maple
Pacific dogwood
Vine maple
Oceanspray
Snowberry
Western serviceberry
Red osier dogwood
Scientific Name Size Spacing
Populus balsamifera
Thuja plicata
Acer macrophyllum
Corpus nutalli
Acer circinatum
Holodiscus discolor
Symphoricarpos albus
Amelanchier alnifolia
Corpus sericea
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
24—inch in height
24—inch in height
24—inch in height
24—inch in height
10 feet o.c.
10 feet o.c.
10 feet o.c.
10 feet o.c.
5 feet o.c.
5 feet o.c
5 feet o.c
5 feet o.c
5 feet o.c
As described above, discharge to the river is not anticipated and turbidity measurement is not
proposed. Turbidity will be visually monitored during construction and the contractor will postpone
earthwork and take corrective action if a visible sediment plume is observed in the river.
e. The owner will maintain the site by removing undesirable vegetation from the site during their
routine grounds maintenance regimen. The owner will irrigate newly planted trees/shrubs, on an
as -needed basis, from July to October. The owner expects that watering may be required on a
weekly basis during the summer. Watering will be completed using a hose or installed irrigation
system.
f. Monitoring the whole site would require visually estimating the areal cover of the whole site.
Estimating areal cover of the entire site may result in some subjectivity whereas, measuring the
areal cover along a transect is more objective and repeatable. No revisions to the monitoring
methods are proposed unless it is a condition of the City's authorization. Photos will be submitted
with annual monitoring reports.
GeoEngineers specifies a 100-percent biodegradable coir erosion control blanket. It is our
experience that this material does not substantially impact volunteering of plants. The expected
functional lifespan of this biodegradable material is less than two years.
g.
h. Native trees and shrubs will be installed in the disturbed areas of the site as illustrated in Sheet 4
of the revised design plans. Plants may be installed down to the OHWM, depending on the actual
area disturbed during construction. Willows are not recommended because of the lack of sufficient
hydrology for these species.
We have revised our project design report, design plans and SEPA Checklist to reflect the revisions discussed
in this memo. Those materials are included in this submittal package. Please contact Thomas Bannister at
206-251-1025 if you need additional information or clarification.
Disclaimer. Any electronic form, facsimile or hard copy of the original document (email, text, table, and/orfigure), if provided, and any attachments are only a copy of the
original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record.
GEOENGINEERS
Plaza 600 Building
600 Stewart Street, Suite 1700
Seattle, Washington 98101
206.728.2674
July 30, 2015
LD Schneider and Associates
3200 North Central Avenue, Suite 1470
Phoenix, Arizona 85012
Attention: Kurt Schneider
Subject: Revised Analysis and Design Report
Green River Bank Repair
14900 Interurban Avenue South
Tukwila, Washington
GeoEngineers File No. 21493-001-01
INTRODUCTION
GeoEngineers, Inc. (GeoEngineers) is pleased to present an analysis of site conditions and a design to
repair an eroding bank along the Green River adjacent to the property at 14900 Interurban Avenue South
in Tukwila, Washington. The location of the site is mapped on Sheet C-1 in Appendix A. The purpose of this
report is to support an application to the City of Tukwila (City) for a Shoreline Substantial Development
Permit and to the Washington State Department of Fish and Wildlife (WDFW) for a Hydraulic Project
Approval (HPA). We prepared this report to comply with the submittal requirements of Tukwila Municipal
Code (TMC) 18.44.
GeoEngineers submitted the original version of this report to the City on June 24, 2015. Following receipt
of comment from the City, detailed in Correction Letter #1, we revised this report to address the City's
comments and to provide further clarification regarding the proposed project.
GeoEngineers assessed the causes of bank failure and developed multiple design alternatives for
consideration by the owner. We also evaluated the permitting considerations of each option. As part of our
preliminary work, we completed a site assessment and developed a design to address the mechanisms of
bank failure. This report details our methods and findings regarding site conditions, mechanism of
failure and presents permit level design drawings to mitigate for bank failure and restore the bank to a
functional condition.
LD Schneider and Associates July 30; 2615
Page 2
SITE DESCRIPTION AND CONDITIONS
The 3.6-acre property (Parcel #3597000006) is located on the left (west) bank of the Green River. An
approximately 57,000 square -foot, 2-story office building and parking areas are located on the parcel. The
parcel is generally flat and the river is not leveed. According to the US Geologic Survey (USGS), the
Green River is tidally influenced at this location. Overbank bank flooding is extremely rare, particularly on
the left bank of the river. The area of the parcel that is within 200 linear feet of the Ordinary High Water
Mark (OHWM) of the Green River is regulated under the City of Tukwila's Shoreline Master Program.
The Shoreline designation for the site is Urban Conservancy and the River has a buffer of 100 feet
measured from OHWM. The site is also designated as a Fish and Wildlife Habitat Conservation Area
per TMC 18.44.090 H.
A GeoEngineers biologist made a preliminary site visit on May 13, 2014. In general, the riverbank on the
property is vegetated with noxious and invasive Himalayan blackberry. Because of the infestation of
Himalayan blackberry and lack of trees, habitat conditions along the riverbank are degraded. GeoEngineers
observed evidence of a recent slough of the bank located approximately 100 feet southeast of the
commercial building on the property. The recent sloughing resulted in an approximately 10-foot high near
vertical escarpment that damaged an existing asphalt trail at the top of the bank. The trail is separated
from the parking lot by a landscaping island consisting of grass and a row of seven mature sycamore trees.
The biologist also observed water weeping from the bank at the toe of the escarpment. The biologist did
not observe environmentally sensitive areas, such as wetlands, during the site reconnaissance.
On August 12, 2014, a GeoEngineers geotechnical engineer, river hydrologist, and biologist evaluated slope
stability, habitat, and flow conditions at the site. During this site visit, the geotechnical engineer noted that
the soil exposed in the riverbank consisted of fine to medium silty sand and silt. This material is typical of
alluvium in the Green River valley. Bedrock was observed in the riverbanks upstream (south) of the property.
Bedrock is also known to be present (State of Washington Department of Natural Resources [DNR] Geology
Maps) on the hillside to the west of the site.
DNR maps the local geologic unit as the Puget Group (Tp). The Puget Group consists of sandstone, siltstone,
claystone, and coal which is white and very fine grained to gritty. The Tiger Mountain Formation, which
consists of light-colored, medium -grained sandstone with siltstone, minor pebble conglomerate, and coal
beds, is mapped in isolated outcrops in the river valley. The Renton Formation (Tpr), which is a fine- to
coarse -grained sandstone with interbedded siltstone, claystone, and coal, is mapped on the hillside to the
west of the site. Alluvial deposits (Qal) are mapped immediately adjacent to the site as comprising the river
bed and riverbanks. Alluvium is described as a mix of moderately to poorly sorted granular soils deposited
by the river.
We completed two subsurface geologic explorations at the top of the recently sloughed area where the trail
has become undermined and approximately halfway between this point and the corner of the building.
These explorations were performed with a track -mounted drill rig and advanced to a depth of 36.5 feet (at
the top of the slough) and 51.5 feet (nearer to the building). Summary logs of our explorations are included
as Appendix A.
The subsurface conditions at the site is consistent with a glacial channel that was carved into siltstone and
sandstone and then partially filled with more recent alluvium from the Green River. We observed the
alluvium to consist of very loose to medium dense silty sand to a depth of approximately 35 feet. We
r•
r•
GEOENGINEERS...0
File No. 21493-001-01
0
LD Schneider and Associates July 30, 2015
Page 3
observed the silty sand material to overlie a white to light gray sandstone with fine inclusions of coal layers.
We interpret this sandstone to be a part of the Tiger Mountain Formation of the Puget Group. The two
borings were terminated within the sandstone.
We observed groundwater in the borings at a depth of approximately 12-14 feet below ground
surface, which is consistent with earlier observations of groundwater seeping out from the toe of the
sloughed surface.
MECHANISM OF BANK SLOUGHING
Based on our observations at the site and experience in the Green River valley, it is our opinion that the
bank sloughing is most likely due to a drawdown failure. This type of failure occurs when high groundwater
levels and high river levels saturate the riverbank soil and then the river levels drops or "draws down" faster
than the water can drain from the riverbank soil. This creates an imbalance of water pressure. The water
pressure pushing the bank from within the soil is no longer balanced by the water pressure from the river
and the riverbank is pushed into the river. In our experience, this is the most common riverbank failure
mechanism on the lower Green River.
Toe erosion is also a failure mechanism that is common on the Green River and often found in conjunction
with drawdown failures. Toe erosion will weaken a riverbank but the ultimate failure is triggered by
drawdown. At this site, the presence of shallow bedrock makes toe erosion less likely to be a significant
contribution to the failure of the riverbank.
In addition to site observations, bathymetric data of the channel bottom was obtained from King County.
Cross sections of the channel bottom in the vicinity of the site do not show the large scour holes typically
evident in areas where toe erosion is a major contributor to slope instabilities. We do not believe toe erosion
to be a contributing factor in the of bank sloughing at the site.
PROJECT DESIGN
We developed a permit -level design to mitigate for the bank sloughing and also to address potential future
drawdown failures. Permit level design drawings are included as Appendix B. The design objective was to
develop a plan appropriate for the site geology and geometry using techniques and materials most likely to
be approved by regulatory agencies and offer long term protection. During preliminary design, we
considered bio-engineered and hard engineering approaches. The identified design options are located
landward of the OHWM for permitting efficiency. Additionally, we believe work waterward of OHWM is
unnecessary because the mechanism of failure is not a result of toe erosion. As such, the project will avoid
impacts to aquatic habitat at the site.
Riverbank Drainage
The project consists of installing a subsurface gravity drainage system to transport water away from the
failure plane and rebuilding the riverbank using a combination of structural fill and native soil. The
subsurface drainage system consists of a perforated 4-inch schedule 40 polyvinyl chloride (PVC) pipe that
will capture subsurface water along the 165-foot length of the bank repair. Solid 4-inch PVC finger drains
set at approximately 20-foot intervals will convey the water from the perforated pipe to outfalls located
GEOENGINEERS,...0
File No. 21493-001-01
LD Schneider and Associates July 30 2-015
Page 4
landward of OHWM. Small rock will be installed at the outfalls to protect against erosion. This rock is
designed to withstand flows from the pipe and sheer stress of river flows under anticipated conditions.
This design will reduce the water pressure upgradient of the riverbank and thereby reduce the potential for
future drawdown failures. The project is designed to address the primary cause of bank failure (drawdown)
and does not include design elements to protect against toe erosion or scour.
We anticipate that a qualified contractor will install the drainage system and restore the bank using a
medium-sized track mounted excavator and other support equipment. The project will be completed during
WDFW's allowable in water work window, or approximately August 1- August 31. Construction is estimated
to take approximately 2 weeks. Because the project is located in the 100-foot buffer of the Green River,
TMC 18.44.090 E(4) requires the owner, the specialist of record (GeoEngineers), the contractor
and representatives from the City of Tukwila to attend a preconstruction meeting at the site. Per
TMC 18.44.090 E(5), GeoEngineers will be retained to monitor construction.
We estimate that approximately 420 cubic yards (yd3) of material will be cut and filled to complete the
project. 0f this 420 cubic yards of material, approximately 160 cubic yards will be native material that will
remain on site and will be incorporated back into the riverbank. It will be necessary to import additional
material to achieve the design elevations and grades. This material and the estimated quantities are listed
below.
Anticipated Material Schedule
Approximately 420 yd3 of cut and fill:
• Approximately 160 yd3 of native material to remain on site.
• Approximately 160 yd3 of imported riverbank fill.
• Approximately 96 yd3 of imported topsoil.
• Approximately 3 yd3 of 1-inch drain rock.
• Approximately 1 yd3 of imported outfall protection.
Stability Analysis of Design
We analyzed the proposed slope repair using the computer program SLOPE/W (GEO-SLOPE International,
Ltd., 2012). The SLOPE/W program evaluates the stability of numerous trial shear surfaces using a vertical
slice limit -equilibrium method (Morgenstern -Price). This method compares the ratio of forces driving slope
movement to the forces resisting slope movement for each trail shear surface, and presents the ratio as
the factor of safety. The program then sorts the trail shear surfaces and identifies the surface with the
lowest factor of safety, or the "critical" shear surface.
We first analyzed the slope in what was likely its configuration just prior to the slough occurring. Our analysis
was based on the subsurface data collected in our explorations and on groundwater conditions consistent
with a drawdown condition. For this condition we calculate that the factor of safety is Tess than 1.0. This
indicates that the forces driving slope movement exceed the forces resisting slope movement and that the
slope would fail. Additionally, the calculated critical shear surface is similar to the observed shear surface
of the slough. This result further corroborates our opinion that the bank slough was triggered by drawdown.
r
'
GEOENGINEERS
File No. 21493-001-01
LD Schneider and Associates July 30, 2015
Page 5
We then analyzed the slope with the proposed repair in place. In this case we calculate that the factor of
safety against a drawdown type failure is 1.3, indicating that the forces available for resisting slope
movement exceed the forces driving slope movement by about 30 percent. As a point of reference, the
United States Army Corps of Engineers (USACE) recommends a calculated factor of safety greater than
about 1.0 or 1.1 against drawdown failures.
Site Restoration
Following installation of the riverbank drainage, the disturbed areas will be restored and enhanced.
The design goal for the project is to reconstruct the bank at an approximate pre -slough slope angle, or
2.5:1 slope. However, the slope angle of the bank reconstruction will be established to fit within the site
constraints, including avoiding damage to the large sycamore trees atop the bank, limiting disturbance to
the root zone and transitioning into the native banks adjacent to the repair. To accommodate this slope
angle, the existing asphalt trail at the top of the bank may need to be realigned. The alignment of the trail
will be established following restoration of the bank. However, under an existing easement with the property
owner, the City will maintain the trail within 40 feet of OHWM. The easement agreement is included as
Appendix D.
Due to the anticipated sheer force during high flow events in the river, we anticipate that the reconstructed
bank will require additional erosion protection. 0ur design includes a biodegradable erosion control fabric
designed to withstand sheer stresses under normal flow conditions. The erosion control fabric will also
stabilize the bank slope from raveling during heavy rain events.
Because the project will be completed landward of OHWM, we do not anticipate temporary or permanent
impacts to the aquatic habitat of the Green River. Temporary impacts will be limited to the blackberry and
English ivy infested bank above OHWM. No trees will be removed as part of the project.
The seven mature sycamores along the top of bank will be protected during construction per the
requirements of the Shoreline Substantial Development permit. Because of the proximity of these mature
trees to the work area it is not practical to protect the trees in the manner required by TMC 18.44.080 B
(10). GeoEngineers recommends that the contractor establish tree protections at the maximum practical
distance from the trunks of the sycamore trees to complete the project. We recommend that the contractor
install high visibility construction fencing between the work area on the bank and the sycamore trees that
are located approximately 15 to 20 feet landward from the top of the riverbank. If necessary that contractor
will install 4-foot high plywood boxes around the trunks to further protect the trees. During site grading, the
contractor will take care when operating equipment in the vicinity of the trees. It is anticipated that the
GeoEngineers biologist will be on site observing grading activities in the vicinity of the trees.
The work area is currently infested with Himalayan blackberry which will be removed during construction.
The project design includes aggressive revegetation to reestablish root strength and help stabilize
the bank. Native plant species will be densely installed in the areas disturbed by the project. Below is a list
of recommended plants to be installed at the site to reestablish root structure and appropriate
riparian habitat. The estimated plant quantities are based on a 4,900 square foot disturbance area.
Installed plant quantities may vary based on the actual disturbance area.
GEOENGINEERS2/2
File No. 21493-001-01
��/
•
LD Schneider and Associates July 30; 2015
Page 6
Estimated
Quantity
12
14
12
12
40
40
40
40
40
Common Name
Black cottonwood
Western red cedar
Big leaf maple
Pacific dogwood
Vine maple
Oceanspray
Snowberry
Western serviceberry
Red osier dogwood
Scientific Name
Populus balsamifera
Thuja plicata
Acer macrophyllum
Corpus nutalli
Acer circinatum
Holodiscus discolor
Symphoricarpos albus
Amelanchier alnifolia
Corpus sericea
Size
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
24—inch in height
24—inch in height
24—inch in height
24—inch in height
Spacing
10 feet o.c.
10 feet o.c.
10 feet o.c.
10 feet o.c.
5 feet o.c.
5 feet o.c
5 feet o.c
5 feet o.c
5 feet o.c
We developed this native plant palette based on our experience with riparian restoration and with guidance
from WDFW (Cramer, 2012). We increase the density of the installed trees to 10 feet on -center at the
request of WDFW (2015). Installed deciduous trees will be 2-inch caliper, conifer will be 6-8 foot height and
shrubs will be 24-inch height in compliance with TMC 18.44.080 C(1)(j). Trees will be planted on 10-foot
spacing per WDFW's request and shrubs will be planted on 5-foot spacing per TMC 18.44.080 C(2)(d).
To enhance aquatic habitat, the GeoEngineers biologist will provide guidance to the contractor in installing
the plants in locations that promote shade and overhanging vegetation near OHWM while maintaining the
view corridors of the existing riverfront trail. Large trees will be installed outside the drip line of the existing
sycamore trees. The planting plan also accounts for the seasonally fluctuating river levels and variable
hydrology up the slope of the riverbank. Because of the typical hot and dry conditions during WDFW's
allowable work window, we recommend that the revegetation of the riverbank be delayed until late fall.
Planting in late summer will likely result in plant failure and poor revegetation. The erosion control fabric
installed on the riverbank will stabilize the bank in the interim between repair of the bank and site
revegetation.
To avoid and minimize water quality impacts during construction, temporary erosion and sediment controls
will be installed prior to site work. A silt fence will be installed on the downslope construction limits, near
OHWM, as the primary water quality protection. Contingency water quality protections include additional
silt fence, silt curtains and straw wattles. Stormwater discharge from the site will be visually monitored. It
is not anticipated that there will be a stormwater discharge during construction because of the typically hot
and dry conditions during the expected construction period in September 2015. No work will occur
waterward of OHWM and construction equipment will not work in the water. Should a problem arise the
contractor will postpone earthwork and take corrective action to comply with state water quality standards.
We estimate the cost to construct the bank repair to be approximately $65,000. 0ur Project Value
documentation is included as Appendix C.
GEOENGINEERS�
File No. 21493-001-01
LD Schneider and Associates July 30, 2015 Page 7
Maintenance and Monitoring
We anticipate that the riverbank drainage system will require minimal maintenance. Maintenance will
include occasional flushing of the system via backwashing from the outfalls. The frequency of this
maintenance will be determined on an as needed basis.
The restored vegetation on the bank will be managed by the on -site property management staff. We
anticipate that the riverbank will be maintained as a part of their routine maintenance regimen.
Maintenance will include physical removal of noxious and invasive species that may be detrimental to
the restored riparian habitat along the riverbank. These noxious and invasive species include but are not
limited to:
• Knotweeds (Polygonum spp.)
• Butterfly bush (Buddleja spp.)
• Himalayan blackberry (Rubus armeniacus)
• English ivy (Hedera helix)
• Scotch broom (Cytisus scoparius)
Use of chemical herbicides to control these species is considered unnecessary and is not recommended.
We recommend that the installed plants be watered during the dry season for a minimum of three years
following plant installation. This watering should occur during the late summer (July to October) and the
frequency shall be determined based on weather conditions and plant performance. We anticipate that the
site will be watered using a hose or a temporary irrigation system.
Beneficial volunteer plants, such as other native species, will be encouraged at the site. Installed plants
that do not survive will be replaced as required by the authorizations from the City of Tukwila and WDFW.
We anticipate that a provision of the permit issued by WDFW will require 80 percent survival of installed
plants for three years following construction of the project. The City of Tukwila will likely require monitoring
of the site for a period of five years following plant installation.
To monitor performance of the restored vegetation and to comply with project permits, a qualified biologist
will annually monitor the site for a period of five years following construction of the project. To track
vegetation performance at the site through the monitoring period, we recommend that the monitoring
biologist establish a transect along the bank. Using the line intercept method, the biologist will inventory
the number and species of native plants observed within 1 foot of either side of the transect shortly
following installation of the plants. The location, orientation and length of this transect will be determined
in the field by the biologist. The endpoints of the transect will be marked in the field. The biologist will return
to the site on an annual basis to complete the survival inventory at the location of the transect. The biologist
will determine annual survival rates which will be used to gauge compliance with WDFW's permit.
Our experience has shown that calculating survival rates is problematic because of the inherent difficulty
of identifying individual plants as the site matures. We recommend that the biologist also measure the
areal cover of beneficial vegetation along the length of the transect. It is our opinion that measuring the
areal cover of native plants is a better indicator of site performance, is more repeatable and results in less
variability amongst site investigators during the monitoring period. Native volunteer plants will be included
in the plant inventory and areal cover measurements for the remainder of the monitoring period. Monitoring
will include photo documentation of the site.
GEOENGINEERS...111w-^
File No. 21493-001-01
!
LD Schneider and Associates July 42015
Page 8
The biologist will complete monitoring events on an annual basis for five years following plant installation.
The findings of each monitoring event will be documented and the owner will submit annual reports to the
City of Tukwila and WDFW.
NO NET LOSS ANALYSIS AND MITIGATION SEQUENCING
Consistent with the City of Tukwila's Shoreline Master Program (SMP), this project will result in no net loss
of shoreline ecological function. The project will result in approximately 5,000 square feet of temporary
impacts to the shoreline. These impacts are necessary to eliminate the inherent public safety issue posed
by the slope failure and to maintain safe, public access to the shoreline on the property. To rectify these
unavoidable impacts, the project follows the mitigation sequencing steps identified in TMC 18.44.070 H(3).
Because the project is located landward of OHWM, it avoid impacts to the aquatic environment of the
Green River. The riparian habitat that will be impacted by the project is heavily degraded and infested with
noxious and invasive plants species. The project proposes to restore and enhance the riparian habitat by
removing invasive species and installing native trees and shrubs. The owner is committed to maintaining
and monitoring the impacted area to ensure the success of the restoration. As a result of these mitigation
steps, the project results in no net loss of shoreline ecological function.
We estimate that approximately 200 cubic yards of bank material sloughed into the river during a recent
drawdown failure. Much of this material has subsequently been eroded and carried downstream by the
river. The drawdown failure resulted a 9-foot high vertical escarpment that damaged the existing public
access trail. The escarpment poses a safety risk which has resulted in the closure of the trail. To eliminate
this safety hazard, the project will add approximately 160 cubic yards of fill material. This fill material is
intended to replace a portion of the bank lost as a result of drawdown failure. We consider this amount of
fill to be minor and will have no measureable impact to the hydrology, habitat or other shoreline function.
REFERENCES
Cramer, Michelle L. (managing editor). 2012. Stream Habitat Restoration Guidelines. Co -published by the
Washington Departments of Fish and Wildlife, Natural Resources, Transportation and Ecology,
Washington State Recreation and Conservation Office, Puget Sound Partnership, and the U.S. Fish
and Wildlife Service. Olympia, Washington.
WDFW. 2015. Personal Communication between Larry Fisher (WDFW) and Thomas Bannister
(GeoEngineers) on June 9, 2015.
LIMITATIONS
We have prepared this revised report for LD Schneider and Associates for failing bank along the Green
River adjacent to the property at 14900 Interurban Avenue South in Tukwila, Washington.
Within the limitations of scope, schedule and budget, our services have been executed in accordance with
generally accepted practices in the fields of geotechnical engineering, hydrology, and restoration design
engineering in this area at the time this report was prepared. The conclusions, recommendations and
GEOENGINEER_
File No. 21493-001-01
LD Schneider and Associates
July 30, 2015
Page 9
opinions presented in this report are based on our professional knowledge, judgment and experience. No
warranty, express or implied, applies to our services and this report.
Any electronic form, facsimile or hard copy of the original document (email, text, table and/or figure), if
provided, and any attachments should be considered a copy of the original document. The original
document is stored by GeoEngineers, Inc. and will serve as the official document of record.
Sincerely,
Senior Geotechnical Engineer
Associate nyurologisi
TAB:US:JMA:leh
Attachments:
Appendix A. Geologic Boring Logs
Appendix B. Permit Level Design Drawings
Appendix C. Project Value Documentation
Appendix D. Trail Easement Agreement
One copy submitted electronically
Disclaimer: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/orfigure), if provided, and any attachments are only a copy
of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record.
GEOENGINEERQ
File No. 21493-001-01
0
APPENDIX A
Geologic Boring Logs
SOIL CLASSIFICATION CHART
ADDITIONAL MATERIAL SYMBOLS
f1
r-)
LJ
n
;n
fl
LJ
f I
fl
t_J
tJ
n
n
U
n
iJ
n
n
v
fl
MAJOR DIVISIONS
SYMBOLS
TYPICAL
DESCRIPTIONS
GRAPH
LETTER
COARSE
GRAINED
SOILS
MORE THAN 50%
RETAINED ON NO.
200 SIEVE
GRAVEL
AND
GRAVELLY
SOILS
MORE THAN 50%OF
COARSE FRACTION
RETAINED ON NO. 4
SIEVE
CLEAN
GRAVELS
(LITRE OR NO FINES)
0 v u c
0 Cy, o
) nC
Gw
WAD ELL-GRED GRAVELS,
GRAVEL -SAND MIXTURES
D Q 0
0 0 C
0 0 0
c
GP
POORLY -GRADED GRAVELS,
GRAVEL - SAND MIXTURES
GRAVELS WITH
FINES
(APPRECIABLELSAMOUNT
OF
GM
SILTY GRAVELS, GRAVEL - SAND
- SILT MIXTURES
lir
AO
GC
CLAYEY GRAVELS, GRAVEL -
SAND - CLAY MIXTURES
SAND
AND
SANDY
SOILS
MORE THAN 50%OF
COARSEFRAC10N
PASSING NO. 4
SIEVE
CLEAN SANDS
(LITRE aft ND FINES)
0 0 0 0 0 0
0 0 0 0 °
SW
WELL -GRADED SANDS,
GRAVELLY S
SP
POORLY-G
GRARLRADEDSAND SANDS,
VELLY
SANDS WITH
FINES
(APPRECIABLE AMOUNT
OF FlNEA)
$M
SILTYSANDS, SAND - SILT
MIXTURES
SC
CLAYEY SANDS, SAND -CLAY
MIXTURES
FINE
GRAINED
SOILS
MORE THAN 50%
PASSING NO. 200
SIEVE
SILTS
AND
CLAYS
LIQUID LIMIT
LESS THAN 50
ML
INORGANIC SILTS, ROCK FLOUR,
CLAYEY SILTS WITH SLIGHT
PLASTICITY
CL
INORGANIC CLAYS OF LOW TO
MEDIUM PLASTICITY, GRAVELLY
CLAYS, SANDY CLAYS, SILTY
CLAYS, LEAN CLAYS
OL
SILTY
PLASTICITY
SILTS
AND
CLAYS
LIQUID LIMIT
GREATER THAN 50
1
1
MH
INORGANIC SILTS, MICACEOUS
OR DIATOMACEOUS SILTY SOILS
, /
`
CH
INORGANIC CLAYS OF HIGH
PLASTICIN
LA/w�--
lu
OH
ORGANIC
TOLAYGSH D SSIICYOF
HIGHLY ORGANIC SOILS
PEAT, HUMUS, SWAMP SOILS
WITH HIGH ORGANIC CONTENTS
pT
NOTE: Multiple symbols are used to indicate borderline or dual soil classifications
LI
•
11
Sampler Symbol Descriptions
2.4-inch I.D. split barrel
Standard Penetration Test (SPT)
Shelby tube
Piston
Direct -Push
Bulk or grab
Continuous Coring
Blowcount is recorded for driven samplers as the number
of blows required to advance sampler 12 inches (or
distance noted). See exploration log for hammer weight
and drop.
A "P" indicates sampler pushed using the weight of the
drill rig.
SYMBOLS
TYPICAL
DESCRIPTIONS
GRAPH
LETTER
AC
Asphalt Concrete
CC
Cement Concrete
CR
Crushed Rock/
Quarry Spells
TS
Topsoil/
Forest Duff/Sod
ohm
AL
CA
CP
CS
DS
HA
MC
MD
OC
PM
PI
PP
PPM
SA
TX
UC
VS
NS
SS
MS
HS
NT
Groundwater Contact
Measured groundwater level in
exploration, well, or piezometer
Measured free product in well or
piezometer
Graphic Log Contact
Distinct contact between soil strata or
geologic units
Approximate location of soil strata
change within a geologic soil unit
Material Description Contact
Distinct contact between soil strata or
geologic units
Approximate location of soil strata
change within a geologic soil unit
Laboratory / Field Tests
Percent fines
Atterberg limits
Chemical analysis
Laboratory compaction test
Consolidation test
Direct shear
Hydrometer analysis
Moisture content
Moisture content and dry density
Organic content
Permeability or hydraulic conductivity
Plasticity index
Pocket penetrometer
Parts per million
Sieve analysis
Triaxial compression
Unconfined compression
Vane shear
Sheen Classification
No Visible Sheen
Slight Sheen
Moderate Sheen
Heavy Sheen
Not Tested
NOTE: The reader must refer to the discussion in the report text and the logs of explorations for a proper understanding of subsurface conditions.
Descriptions on the logs apply only at the specific exploration locations and at the time the explorations were made; they are not warranted to be
representative of subsurface conditions at other locations or times.
KEY TO EXPLORATION LOGS
r,
GEOENGINEERS
FIGURE A-1
Start End
Drilled 4/23/2015 4/23/2015
i
Total --51.5
Depth (ft)
Logged BAW/SST
Checked By LJS
Driller Holocene Drillil�>Inc.
Drilling Hollow Stem Auger
Method
0
8
0
0
0
0
8
3
8
0
Surface Elevation (ft) 28
Vertical Datum NAVD88
Hammer
Data
Auto Hammer
140 (Ibs) / 30 (in) Drop
Drilling
Equipment
Diedrich D50 Truck Rig
Easting (X)
Northing (Y)
System
Datum
Notes:
Groundwater
Depth to
Date Measured Water (81
See Remarks
Elevation (fit
I I I I I 1 1 I I I I 1 1 I f I I 1
'o 's c)0 2s Elevation (feet)
- o cn o Depth (feet)
FIELD DATA
Graphic Log
Group
Classification
MATERIAL
DESCRIPTION
Moisture
Content (%)
Fines
Content (%)
REMARKS
Interval
Recovered (in)
8
0)
3
0
m
Collected Sample
Sample Name
Testing
Water Level
2
3
ML
Brown silt with sand, occasional organic matter
J
- (twigs, duff) (soft, moist)
12
4
28
ML
_ Brown silt with sand (medium stiff, moist)
(alluvium)
118
4
F
21
56
8
3
4A
ML
Brown silt, trace sand (soft, moist) (alluvium)
48
MC
4B
SM
Gray silty sand (very loose, moist) (alluvium)
18
5
SA
33
36
Grades to loose, wet
J 18
9
6-
-
Groundwater observed at 14 feet at time of
drilling
114
10
7
ill 18
7
8A
8B
=
ML
Gray silt, trace sand (medium stiff, moist)
_
(alluvium)
= 20—J
h -
14
3
�F
57
98
- 25
—J
22
10
—
SP-SM
_ Gray fine to coarse sand with silt (medium dense, —
16
-
wet) (alluvium)
-
- -
30--]
21
11
12
—•`' -
-
35---]
18
25
12
- -
Note: See Figure
A-1 for
explanation of symbols.
Log of Boring B-1
G EO E N G I N E E R5
Project:
Project Location:
Project Number:
Green River Bank Design and Permitting
Tukwila, Washington
21493-001-01
Figure A-2
Sheet 1 of 2
r•
f
f•
f•
r'
r•
r•
t-,
✓
FIELD DATA
n
lJ
n
U
n
n
Ll
n
f1
n
u
rl
fl
u
0
0
z
N
S
U
W
0
O
w
O
w
O
0
c?
aJ m
0
0
n 0
0
tJ
E
F
n
E
iJ �
m
O
n
LJ
n
U
1 � K
n
U
r1 N
♦J
Elevation (feet)
w
r
a.
5)
0
- 40� 12
c
To
N • 5)
C �
4).
0
Q7
Collected Sample
d
E
z
C
E w
Water Level
0
V
d
0
c
0
U
t3. N
z
0 @
0
MATERIAL
DESCRIPTION
REMARKS
- 451 18
'1- 9
501 18
22
50
73
13A
138
14
15
STONE -
SAND Sandstone: white; visually fresh; fine grained
(Puget Group Tiger Mountain formation)
Note: See Figure A-1 for explanation of symbols.
Log of Boring B-1 (continued)
G EO E N G I N E E R S
Project:
Project Location:
Project Number:
Green River Bank Design and Permitting
Tukwila, Washington
21493-001-01
Figure A-2
Sheet 2 of 2
Start End
Total 66.5
Depth (ft)
Logged BFAW/SST
Checked By LJS
Driller Holocene Drillitt9-4nc.
Drilling Hollow Stem Auger
Method
Drilled 4/23/2015 4/23/2015
Surface Elevation (ft) 28
Vertical Datum NAVD88
Hammer
Data 140 (Ibs) / 30 (in) Drop
Drilling Diedrich D50 Truck Rig
Equipment
Easting (X)
Northing (Y)
System
Datum
Groundwater
Depth to
Date Measured Water (ftl Elevation (ftl
Notes:
See Remarks
0
z
yi
0
H
0
m'
0
1-
c0�
N
z
z
0
m
m
E
0
0
0
8
z
8
0
0
U
0
a
y
3
e.
6
i i 1 i i i i 1 i i i i 1 1 i i i 1 i i ♦
'o s Q0 2s Elevation (feet)
o 8 'o cn o Depth (feet)
I I 1 I I I i i i I I I I I 1 I i i 1 1 I
FIELD DATA
Graphic Log
Group
Classification
Moisture
Content (%)
Fines
Content (%)
Interval
Recovered (in)
2
N
3
0
m
Collected Sample
Sample Name
Testing
Water Level
MATERIAL
DESCRIPTION
REMARKS
12
3
AC
T2 inches asphalt concrete walkway
II
1
0
6
4
2
2
SM
- Brown silty fine to medium sand (very loose,
moist) (alluvium) -
12
118
1 18
1 18
12
18
6
4
10
10
12
2
3B
4
%F
5
6
SA
8A
SM
Brown silty fine to medium sand (loose, moist)
- (alluvium)
-
Grades to wet
_ Grades to medium dense with trace organic -
matter (small roots)
—
= =
—
33
33
43
47
Groundwater observed at 12 feet at time of
drilling
- -
h -
22
ML
Light gray silt with trace horizontally oriented
organic matter (fine fibrous wood fragments)
- (soft, moist) (alluvium) -
60
_ _
25—
O -
= 30--]
y -
1 12
18
23
9
F
10
SP-SM
_ Gray fine to coarse sand with silt (medium dense, _
wet) (alluvium)
— —
-
26
10
Driller indicated different drilling conditions at
= 35
18
37
11
SAND
STONE
Sandstone: white, visuallyfresh, finegrained
— (Puget Group Tiger Mountain formation) —
approximately 34 feet
Note: See Figure A-1 for explanation of symbols.
Log of Boring B-2
G EO E N G I N E E R S
Project:
Project Location:
Project Number:
Green River Bank Design and Permitting
Tukwila, Washington
21493-001-01
Figure A-3
Sheet 1 of 1
r�
r1
f •
r •
t. •
t
C C C C C C C J C C. 3 C? C _CC i C? C :3
L
J
21943-001-00 SST:LJS 04-28-2015
p-v 321f10IJ
S11f1S3d SISA1VNV 3A3IS
PERCENT PASSING BY WEIGHT
100
90
80
70
60
50
40
30
20
10
0
U.S. STANDARD SIEVE SIZE
3" 1.5" 3/4" 3/8" #4 #10 #20 #40 #60 #100 #200
1000
100
0
10
4
1
GRAIN SIZE IN MILLIMETERS
01
0.01
0.001
BOULDERS
COBBLES
GRAVEL
SAND
COARSE
FINE
COARSE
MEDIUM
FINE
SILT OR CLAY
SYMBOL
EXPLORATION
NUMBER
DEPTH
(ft)
USCS SOIL CLASSIFICATION
B-2
B-1
17.5
10
Gray silty sand (SM)
Brown silty sand (SM)
•
r
APPENDIX B
Permit Level Design Drawings
01\00\CAD \214930
5133rd 5t
'orh
A
¢
FOSTER P
�37th St
5 140th St 5 140th St
st
Showalter Middle
School
Foster Nigh School
S 144th 5t
St
S 146th St
4'
5 150th St
rvd
5 160th St
5 156th St
S 164th 5t
5 166th St
4' S 139th St
♦
Crystal Springs
Part
tower calf Swiss
a PS
S 144th St
5 147th St
S 150th St
S 152nd St
Rds
5 143rd pl
LD SCHNIEDER
GREEN RIVER BANK REPAIR
TUKWILA, WASHINGTON
BLACK RIVER
4
5'43rdSt JUNCTION
5 130th St 4 a5
5 Langston Rd 5 Langston Rd 4
S 132ndsr S 732nd sr v. S 132nd Se5132n
5 133rd SC
s 134rh se
5 135th 5r
Black River Quarry
PROJECT
SITE
C_ 3
Stort CentPark 5
m �r49th S
5 9L
P3
S 153rd St
rn Tukwila Park
1
Tukwila Via, a
uchcen`
T"kI5 /4 Pkwy tuk vwiia Pk
3
D
c
Southcent▪ er Mall 4
Baker Blvd
VICINITY MAP
SCALE: 1 "=100'
• Stranger Blvd
Treck Dr
GRAPHIC SCALE
1000 1000
FEET
CD
•
Black Meer Riparun
forest and Wetland
8
r
•7
5
n
m
J C
< R
7',r: Tukwila
!aa A = 3
'4
m�v
SW 16th 5t
SW 27th sr
O
SHEET INDEX:
1 VICINITY MAP AND SITE MAP
2 NOTES AND SPECIFICATIONS
$ SITE PLAN
4 CROSS —SECTIONS
5 DETAILS
GRAPHIC SCALE
400
0
400
FEET
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV Description
Dote By Chk Rev
DESIGNED LJS
DRAWN
DATE 051,27115. FILE N0. 21493-001-01
TJM
CHECKED JMA
SCALE AS NOTED .REVISED. 00/00100
GEOENGINEER.
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
VICINITY MAP AND SITE MAP
SHEET
1
Q
1-
0
z
a
0
z
1-
0
O
GENERAL NOTES:
1. THESE DESIGNS AND DRAWINGS HAVE BEEN PREPARED FOR THE EXCLUSIVE USE OF LD SCNEIDER, AND
THEIR AUTHORIZED AGENTS. NO OTHER PARTY CAN RELY ON THE PRODUCT OF OUR SERVICES UNLESS
GEOENGINEERS INC. (GEOENGINEERS) AGREES IN WRITING IN ADVANCE OF SUCH USE.
2. THE DRAWINGS CONTAINED WITHIN SHOULD NOT BE APPLIED FOR ANY PURPOSE OR PROJECT EXCEPT
THE ONE SPECIFIED.
3. THESE DESIGNS AND DRAWINGS ARE COPYRIGHTED BY GEOENGINEERS, INC. ANY USE, ALTERATION,
DELETION, OR EDITING OF THIS DOCUMENT WITHOUT EXPLICIT WRITTEN PERMISSION FROM GEOENGINEERS
IS STRICTLY PROHIBITED. ANY OTHER UNAUTHORIZED USE OF THIS DOCUMENT IS PROHIBITED.
4. THE CONTRACTOR SHALL CONSTRUCT THE PROJECT IN ACCORDANCE WITH THE PLANS STAMPED
"APPROVED FOR CONSTRUCTION." THESE PLANS WILL BE PROVIDED TO THE CONTRACTOR BY THE
ENGINEER OR PROJECT INSPECTOR PRIOR TO CONSTRUCTION. WORK SHALL NOT BE INITIATED WITHOUT
THE PLANS APPROVED FOR CONSTRUCTION.
5. THE DESIGNS DEPICTED HEREIN ARE APPROXIMATE AND ARE INTENDED TO EXPRESS THE OVERALL DESIGN
INTENT OF THE PROJECT. THESE DESIGNS MAY NEED TO BE ADJUSTED IN THE FIELD DURING
CONSTRUCTION IN ORDER TO MEET THE SPECIFIC SITE CONDITIONS AND INTENDED FUNCTION. THESE
RIVER IMPROVEMENTS HAVE BEEN DEVELOPED WITH THE UNDERSTANDING THAT A QUALIFIED
GEOENGINEERS ENGINEER AND/OR SCIENTIST BE ON -SITE TO PROVIDE CONSTRUCTION GUIDANCE WHILE
THE PROJECT IS CONSTRUCTED.
6. CONDITIONS CAN CHANGE AND THESE DESIGNS ARE BASED ON CONDITIONS THAT EXISTED AT THE TIME
THE DESIGN WAS PERFORMED. THE RESULTS OF THESE DESIGNS MAY BE AFFECTED BY THE PASSAGE
OF TIME, BY MANMADE EVENTS SUCH AS CONSTRUCTION ON OR ADJACENT TO THE SITE, OR BY NATURAL
EVENTS SUCH AS FLOODS, EARTHQUAKES, SLOPE INSTABILITY OR GROUNDWATER FLUCTUATIONS. ALWAYS
CONTACT GEOENGINEERS BEFORE APPLYING THESE DESIGNS TO DETERMINE IF THEY REMAIN APPLICABLE.
7. THESE PLANS AND ELECTRONIC DRAWINGS ARE BASED ON WASHINGTON STATE PLANE NORTH
COORDINATES US FEET AND A NORTH AMERICAN VERTICAL DATUM OF 1988 US FEET. ELEVATIONS AND
NORTHINGS AND EASTINGS WITHIN THIS PLANSET ARE BASED ON THESE DATUMS.
CONSTRUCTION NOTES:
1. CONTRACTORS WORKING WITHIN THE PROJECT BOUNDARIES ARE RESPONSIBLE FOR COMPLIANCE WITH ALL
APPLICABLE SAFETY LAWS. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL BARRICADES, SAFETY
DEVICES AND CONTROL OF TRAFFIC WITHIN AND AROUND THE CONSTRUCTION AREA.
2. MATERIAL AND WORKMANSHIP FURNISHED ON OR FOR THE PROJECT MUST MEET THE MINIMUM
REQUIREMENTS OF PROJECT PERMITS, APPROVING AGENCIES, SPECIFICATIONS AS SET FORTH HEREIN, OR
WHICHEVER IS MORE RESTRICTIVE.
3. THE CONTRACTOR SHALL INSTALL AND MAINTAIN APPROPRIATE SEDIMENT CONTROL DEVICES THROUGHOUT
THE WHOLE PROJECT SITE, INCLUDING THE CONSTRUCTION STAGING AREA AND STOCKPILE AREA
THROUGHOUT THE PROJECT'S CONSTRUCTION. TEMPORARY CONSTRUCTION AND PERMANENT EROSION
CONTROL MEASURES SHALL BE DESIGNED, CONSTRUCTED AND MAINTAINED IN ACCORDANCE WITH
APPLICABLE LOCAL, STATE AND FEDERAL REGULATIONS.
4. CONSTRUCTION SHALL OCCUR DURING THE APPROVED WDFW FISH WINDOW FOR THE PROJECT AREA.
5. DISCHARGES ENTERING ACTIVE STREAMS ON -SITE SHALL SATISFY ALL STATE AND FEDERAL STANDARDS
AND PROJECT PERMIT REQUIREMENTS FOR CONTAMINANTS AND TURBIDITY.
SPECIFICATIONS:
A. REFERENCED SPECIFICATIONS ARE FROM THE 2014 VERSION OF THE WSDOT STANDARD SPECIFICATIONS
FOR ROAD, BRIDGE, AND MUNICIPAL CONSTRUCTION.
MATERIALS:
A. RIVERBANK FILL
1. RIVERBANK FILL SHALL CONSIST OF WELL GRADED SAND AND GRAVEL CONFORMING TO EITHER WSDOT
STANDARD SPECIFICATION 9-03.10 "AGGREGATE FOR GRAVEL BASE", 9-03.12(2) "GRAVEL BACKFILL FOR
WALLS", 9-03.13(1) "GRAVEL BORROW", 9-03.13(2) "SELECT BORROW", OR OTHER MATERIALS AS
APPROVED BY THE GEOTECHNICAL ENGINEER. NATIVE ALLUVIUM FROM THE EXISTING RIVERBANK MAY BE
INCORPORATED INTO THE RIVERBANK FILL PROVIDED THAT THE ALLUVIUM CONTAINS LESS THAN 30
PERCENT FINES (MATERIAL PASSING THE NO. 200 SIEVE) BY WEIGHT OR AS APPROVED BY THE
GEOTECHNICAL ENGINEER.
2. RIVERBANK FILL SHALL BE FREE OF ORGANICS OR OTHER DELETERIOUS MATERIALS.
B. DRAINAGE ROCK
1. DRAINAGE ROCK SHALL MEET WSDOT STANDARD SPECIFICATION 9-03.12(2) "GRAVEL BACKFILL FOR
WALLS."
C. DRAIN PIPE
1. DRAIN PIPE SHALL CONSIST OF 4-INCH SCHEDULE 40 PVC PIPE. THE PIPE SHALL BE SOLID OR
PERFORATED AS INDICATED ON THE PROJECT PLANS. THE PIPE AND CONNECTIONS SHALL MEET AASHTO
SPECIFICATION M 278. PIPE CONNECTIONS AND DETAILING SHALL BE IN ACCORDANCE WITH THE
MANUFACTURER'S RECOMMENDATIONS.
2. PERFORATED DRAIN PIPE INSTALLED PARALLEL TO THE SLOPE AND SHALL CONNECT TO SOLID DRAIN
D.
1.
PIPES (OUTLET DRAINS) THAT DAYLIGHT TO THE SLOPE FACE. SOLID DRAIN PIPES SHALL BE SPACED NO
MORE THAN 20 FEET APART. SOLID DRAIN PIPES SHALL DISCHARGE ON AN EROSION PROTECTION PAD
OR EXTEND TO THE BASE OF THE EXISTING SLOPE. EROSION PROTECTION PADS SHALL BE
CONSTRUCTED OF MATERIAL CONFORMING TO WSDOT STANDARD SPECIFICATION 9-03.9(2) "PERMEABLE
BALLAST". THE EROSION PROTECTION PADS SHALL BE FIELD FIT BY THE ENGINEER AT THE DISCHARGE
LOCATIONS AND SHALL HAVE A MINIMUM THICKNESS OF 6-INCHES, MINIMUM LENGTH (PARALLEL TO
SLOPE) OF 2 FEET, AND MINIMUM WIDTH (PERPENDICULAR TO SLOPE) OF 1 FOOT.
NON -WOVEN GEO-TEXTILE
NON -WOVEN GEO-TEXTILE SHALL MEET WSDOT STANDARD SPECIFICATION 9-33.1 "GEOSYNTHETIC
MATERIAL REQUIREMENTS" FOR NON -WOVEN GEO-TEXTILES USED FOR SEPARATION.
E. RECYCLED MATERIAL
1. RECYCLED MATERIAL SHALL NOT BE USED IN AGGREGATES OR FILL.
F. TOPSOIL
1. TOPSOIL SHALL CONSIST OF A COMMERCIALLY AVAILABLE 3-WAY MIXTURE CONSISTING OF LOAM SOIL,
ORGANICS AND COMPOST PASSING '-INCH SIEVE.
G. EROSION CONTROL BLANKET AND STRAW WATTLES
1. EROSION CONTROL BLANKET SHALL COMPLY WITH WSDOT STANDARD SPECIFICATION 9-14.5(2)D
"BIODEGRADABLE EROSION CONTROL BLANKET FOR DITCHES. THE EROSION CONTROL BLANKET SHALL BE
100-PERCENT BIODEGRADABLE COIR WITHOUT MESH BACKING. THE EROSION CONTROL BLANKET SHALL
BE APPROVED BY GEOENGINEERS PRIOR TO INSTALLATION.
2. STRAW WATTLE OR SIMILAR SHALL BE 100% BIODEGRADABLE. STRAW WATTLES SHALL BE APPROVED BY
GEOENGINEERS PRIOR TO INSTALLATION.
EXECUTION:
A. SUBGRADE PREPARATION
1. SUBGRADES SHALL BE CLEARED AND GRUBBED. REMOVE BRUSH, SOD, OR OTHER ORGANIC OR
DELETERIOUS MATERIALS PRIOR TO THE PLACEMENT OF FILL. SOFT AREAS SHALL BE OVEREXCAVATED
AND REPLACED, AS DIRECTED BY GEOTECHNICAL ENGINEER.
2. SUBGRADE SHALL BE APPROVED BY GEOTECHNICAL ENGINEER. SUBGRADE SOILS SHALL BE COMPACTED
TO A FIRM AND UNYIELDING CONDITION BEFORE CONSTRUCTION PROCEEDS. SUBGRADE MATERIALS NOT
MEETING GEOTECHNICAL ENGINEER'S APPROVAL SHALL BE REMOVED AND REPLACED WITH RIVERBANK FILL
AT DIRECTION OF GEOTECHNICAL ENGINEER.
3. OVEREXCAVATED AREAS SHALL BE REPLACED WITH COMPACTED RIVERBANK FILL MATERIAL.
B. SLOPE PREPARATION
1. EXISTING SLOPES SHALL BE RE -GRADED AS REQUIRED TO INSTALL SPECIFIED IMPROVEMENT AND TO
MAINTAIN A SAFE WORK ZONE. THE CONTRACTOR IS RESPONSIBLE FOR MAINTAINING A SAFE WORK ZONE
AND COMPLYING WITH THE PROVISIONS OF TITLE 296 WASHINGTON ADMINISTRATIVE CODE (WAC), PART N,
"EXCAVATION, TRENCHING AND SHORING."
2. FILL PLACED ON OR ADJACENT TO SLOPES SHALL BE PLACED ON HORIZONTAL BENCHES CUT INTO THE
EXISTING SLOPE.
3. BENCHES SHALL EXTEND A MINIMUM OF 2-FEET HORIZONTALLY INTO THE SLOPE AND MAY BE CUT IN
STAGES AS THE FILL PROGRESSES.
C. FILL PLACEMENT AND COMPACTION
1. FILL MATERIAL SHALL BE PLACED IN LOOSE LIFTS NOT EXCEEDING 12-INCHES AND COMPACTED USING
EQUIPMENT DESIGNED FOR SOIL COMPACTION.
2. FILL SHALL BE UNIFORMLY COMPACTED TO A MINIMUM 90 PERCENT OF MAXIMUM DRY DENSITY (MDD) AS
DETERMINED BY ASTM D-1557.
D. SITE REVEGETATION
1. TOPSOIL SHALL BE LOOSELY PLACED ABOVE THE RIVERBANK FILL TO A DEPTH OF 12 INCHES. THE
FINISH GRADE SHALL BE TAMPED FIRM AND PROTECTED FROM EROSION.
2. THE EROSION CONTROL BLANKET SHALL BE SHINGLED OR PLACED IN A MANNER SUCH THAT RIVER
FLOWS AND WIND DO NOT PEEL UP THE FABRIC. THE EROSION CONTROL FABRIC SHALL BE ANCHORED
FOLLOWING THE MANUFACTURER'S INSTRUCTION.
3. NATIVE PLANTS, IDENTIFIED IN THE PLANT SCHEDULE, SHALL BE INSTALLED FOLLOWING THE LAYOUT
PROVIDED BY THE GEOENGINEERS BIOLOGIST. PLANTS SHALL BE INSTALLED THROUGH THE EROSION
CONTROL FABRIC BY CUTTING THE FABRIC TO THE MINIMUM NECESSARY TO INSTALL THE PLANTS.
E. SITE MAINTENANCE AND MONITORING
1. THE SITE WILL BE MAINTAINED BY THE OWNER INTO PERPETUITY AND IN COMPLIANCE WITH THE
PROJECT PERMITS.
2. THE SITE WILL BE MONITORED FOR A PERIOD OF FIVE YEARS FOLLOWING PLANT INSTALLATION AS
SPECIFIED IN THE DESIGN AND ANALYSIS REPORT BY GEOENGINEERS OR AS REQUIRED BY THE PROJECT
PERMITS.
ANTICIPATED MATERIAL SCHEDULE
APPROXIMATELY 420 YD3 OF CUT AND FILL:
• ,-160 YD3 OF NATIVE MATERIAL TO REMAIN ON SITE.
• -160 YD3 OF IMPORTED RIVERBANK FILL.
• YD3 OF IMPORTED TOPSOIL.
• -3 YD3 OF 1-INCH DRAIN ROCK.
• --1 YD3 OF IMPORTED OUTFALL PROTECTION.
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV
Description
Date ' By Chk
Rev
REVISION PER AGENCY COMMENTS
7-22-15 TJM
TAB
LJS
DESIGNED LJS
DRAWN TJM
DATE 05/27/15
FILE N0. 21493-001-01
CHECKED JMA
SCALE AS NOTED
REVISED: 07/22/15
GEOENGINEERS.g
600 Stewart Street, Suite 1700 P: 206-728-2674
Seattle, WA 98101 F: 206-728-2732
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
NOTES AND SPECIFICATIONS
SHEET
2
OHWM
OHWM
ASPHALT
TRAIL
100' WIDE TYPOS RIVER BUFFER &
URBAN CONSERVANCY BUFFER
COMMERCIAL BUILDING
LEGEND
B-1 -4- BORING LOCATIONS'
4S - - - — EXISTING CONTOURS
PROPOSED BANK LINES
OHM ORDINARY HIGH WATER MARK
LIMITS OF WORK
SILT FENCE
. BORING LOGS PROVIDED IN ACCOMPANYING REPORT (GEOENGINEERS 2015)
VERTICAL DATUM: NAVD88
STONE BENCH
OHWM
GREEN RIVER
OH WM
EL=10.0'
OHWM
OHWM
OHWM
STONE BENCH
34" SYCAMORE
PLAN VIEW
SCALE: 1 "=10'
24" SYCAMORE
SCALE
10 0 10
FEET
i--5—
OUTLET DRAIN
(TYP.)
OHWM
BOTTOM OF FILL SLOPE r— SILT FENCE
OHWM
DRAIN
PIPE
p ARK1NG LOT
/ OHWM
- OHWM
OtOg'
OHWM
ZC- -
/ J
l/ —1
ASPHALT
TRAIL
SYCfMORE
i
24" SYCAMORE
TOP OF
EXISTING SLOPE
41" SYCAMORE
PROTECT TREES PER
CITY REQUIREMENTS
(TYP.)
OMA
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV
Description
Date
By
Chk Rev
01\00\CAD\21493
DESIGNED LJS
DRAWN TJM
CHECKED JMA
DATE 05/27/15
SCALE AS NOTED
FILE NO. 21493-001-01
REVISED: 00/00/00
GEOENGINEERS
600 Stewart Street. Suite 1700 P: 206-728-2674
Seattle, WA 98101 F. 206-728-2732
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
SITE PLAN
SHEET
3
:SECTIONS MODIFIED BY TMICHAUD ON JUL 22, 2015 - I
P:\21\21493001\00\CAD\21493001-01 DESIGN SHEETS.DWG T
SCALE
5
5
FEET
24" SYCAMORE
(PROTECT TREE PER
GEOENGINEERS)
I-- PARKING LOT
30 —
20-
10 —
0
1�
LANDWARD LIMITS OR WORK
1 EXISTING
1 — ASPHALT
TRAIL
SEE ANCHOR TRENCH DETAIL
-11
CUT AS REQUIRED FOR SAFETY AND STABILITY
2%
SEE DRAIN DETAIL OUTLET DRAIN —
SEE ANCHOR TRENCH DETAIL
40' TRAIL EASEMENT (APPROXIMATE)
TOP SOIL ,— EXISTING GRADE
RIVERBANK FILL
NATIVE VEGETATION (TYP.)
EROSION CONTROL FABRIC
2.5 OUTFALL PROTECTION PER
MATERIAL NOTE C-2
BASE FLOOD ELEVATION
SILT FENCE
(WATERWARD LIMITS
OF WORK)
OHWM
— 30
—20
10
30" SYCAMORE
(PROTECT TREE PER
GEOENGINEERS)
30
20 —
10 -
0
PARKING LOT
20 30
SECTION
40
Distance (Feet)
50
60
A
HORIZONTAL SCALE 1"=5'
VERTICAL SCALE:
SEE ANCHOR TRENCH DETAIL
CUT AS REQUIRED FOR SAFETY AND STABILITY
SEE DRAIN DETAIL
LANDWARD LIMITS OR WORK
EXISTING
ASPHALT
TRAIL
C-2
NATIVE VEGETATION (TYP.)
EXISTING GRADE
TOP SOIL
70
80
— 30
RIVERBANK FILL —
EROSION CONTROL FABRIC —
BASE FLOOD ELEVATION
OUTFALL PROTECTION PER
2.5 MATERIAL NOTE C-2 —
1
SEE ANCHOR TRENCH DETAIL
40' TRAIL EASEMENT (APPROXIMATE)
SILT FENCE
(WATERWARD LIMITS _
OF WORK)
OHWM
0
10
20
SECTION
30
40
Distance (Feet)
50
B
HORIZONTAL SCALE: 1,5'
VERTICAL SCALE: 1'=5'
C-2
60
70
80
10
0
10
0
85
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV
Description
Dole
By
Chk
Rev
REVISION PER AGENCY COMMENTS
7-22-15
TJM
TAB
WS
DESIGNED LJS
DRAWN TJM
DATE 05/27/15
FILE NO. 21493-901-01
CHECKED JMA
SCALE AS NOTED
REVISED: 07/22/15
GEOENGINEERS
600 Stewort Street, Suite 1700 P: 206--728-2674
Seattle, WA 98101 F: 206-728-2732
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
CROSS -SECTIONS AND DRAIN DETAIL
SHEET
4
P:\21\21493001\00\CAD\21493001-01 DESIGN SHEETS.DWG\TAB:DETAILS MODIFIED BY TMICHAUD ON JUL 21, 2015 - 13:09
4" SCH40 PERFORATED
PVC DRAIN PIPE
EL. 15.0'
RIVERBANK FILL
12"
DRAIN DETAIL
NON -WOVEN GEOTEXTILE
SOLID SCH40 PVC
OUTLET DRAIN
2%
NATIVE SOIL
NOT TO SCALE
JOINTS IN FILTER FABRIC SHALL BE SPLICED
AT POSTS. USE STAPLES, WIRE RINGS, OR
EQUIVALENT TO ATTACH FABRIC TO POSTS.
ill IIIJL_;7;;I rllTll_Ili�ll AIII>TIIl-\
6' MAX. \ MINIMUM 4"x4" TRENCH
/ BACKFILL TRENCH WITH
NATIVE SOIL OR 3/4"-1.5"
POST SPACING MAY BE INCREASED WASHED GRAVEL
TO 8' IF WIRE BACKING IS USED
2"x2" BY 14 Ga. WIRE OR
EQUIVALENT, IF STANDARD
STRENGTH FABRIC USED
FILTER FABRIC
NOTE: FILTER FABRIC FENCES SHALL BE
INSTALLED ALONG CONTOUR WHENEVER POSSIBLE
Recommended Planting Schedule
Estimated
Quantity Common Name Scientific Name Size Spacing
12 Black cottonwood Populus balsamifera 6 - 8 feet in height 10 feet o.c.
14 Western red cedar Thuja plicate 6 - 8 feet in height 10 feet o.c.
12 Big leaf maple Acer macrophyllum 6 - 8 feet in height 10 feet o.c.
12 Pacific dogwood Cornus nutalli 6 - 8 feet in height 10 feet o.c.
40 Vine maple Acer circinatum 6 - 8 feet in height 5 feet o.c.
40 Oceanspray Holodiscus discolor 24-inch in height 5 feet o.c
40 Snowberry Symphoricarpos albus 24-inch in height 5 feet o.c
40 Western serviceberry Amelanchier alnifolia 24-inch in height 5 feet o.c
40 Red osier dogwood Cornus sericea 24-inch in height 5 feet o.c
PLANT SCHEDULE
2"x4" WOOD POSTS, STEEL FENCE
POSTS, REBAR, OR EQUIVALENT
SILT FENCE DETAIL
EXCESS SOCK
MATERIAL, DRAWN
IN AND TIED OFF
AT STAKE (TYP.)
DISTURBED
AREA
10' (MAX)
DISTURBED
AREA
SECTION
PLAN VIEW
10' - 0" ® 30" ANGLE EACH
END TO PREVENT FLOW
AROUND (TYP.)
2"X2" X 3'
WOODEN STAKE
COMPOST SOCK
- SEE NOTE 1
CONTOUR LINE (TYP.)
2'X 2'X 3' WOODEN STAKE,
SPACED EVERY 3' 0.C. (TYP.)
DETAIL
NOTES:
1. COMPOST SOCK SHALL BE IN ACCORDANCE
WITH STANDARD SPECIFICATION 9.14.4(9).
COMPOST SOCK SHALL BE A MINIMUM OF 10"
IN DIAMETER OR SIZED TO SUIT CONDITIONS
AS SPECIFIED BY THE ENGINEER.
2. ALWAYS INSTALL COMPOST SOCK
PERPENDICULAR TO SLOPE AND ALONG
PROTECTED CONTOUR LINES.
AREA
(SHOWN AS SLOPE PROTECTION)
3. REMOVE SEDIMENT FROM THE UP SLOPE SIDE
OF THE COMPOST SOCK WHEN ACCUMULATION
HAS REACHED 1/2 OF THE EFFECTIVE HEIGHT
OF THE COMPOST SOCK.
4. MAY BE USED IN PLACE OF FILTER FENCE
FOR PERIMETER CONTROL.
STRAW WATTLE DETAIL
NOT TO SCALE NOT TO SCALE
EROSION CONTROL FABRIC
LOOSEN AND/OR CUT CIRCLING ROOTS
IN ROOT BOUND CONTAINERS BEFORE
PLANTING
BREAK UP SIDES AND BOTTOMS
OF PLANTING PIT TO ALLOW
FOR ROOT PENETRATION
COMPACT SUBGRADE
BELOW ROOT BALL
TYPICAL PLANTING DETAIL
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV Description
Date
By Chk Rev
Q REVISION PER AGENCY COMMENTS
7-22-15
TJM
TAB
LJS
DESIGNED LJS
DRAWN TJM
DATE 05/27/15 (FILE NO. 21493-001-01
CHECKED JMA
SCALE AS NOTED
REVISED: 07/22/15
�s SpSEPy Sw
`Y' of WASy. �0 i
� ro
rP Pr oljt`'s
GEOENGINEERQ
600 Stewart Street, Suite 1700 P: 206-728-2674
Seattle, WA 98101 F: 206-728-2732
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
DETAILS
SHEET
5
APPENDIX C
Project Value Documentation
l
LB Schneider Green River Bank Repair - Project Value Documentation
14900 Interurban Avenue South
Tukwila, Washington
Description
Description of Quantity
QTY per
foot of
repair
Unit
Unit Cost
(Total +
0&P)
Total for
Foot of
Repair
Project Total
Based on 160
Feet of Repair
Excavation and Haul
Riverbank Excavation Including Haul & Disposal
Bid Tab 1060 From B&D Levee Project
0
CY
$17.00
$0.00
$0.00
Subtotal
Subsurface Drainage
Fabric Laid in Trench
RS Means
1.3
SY
$2.42
$3.15
$503.36
Drainage Material
RS Means
0.22
CY
$34.00
$7.48
$1,196.80
6-in PVC Perforated
RS Means
2
LF
$14.45
$28.90
$4,624.00
Rock for Erosion & Scour Protection (Class A)
Bid Tab 1326 B&D Levee
0.126
TON
$48.00
$6.05
$967.68
Subtotal
$42.43
$6,788.48
Foundation Preparation
Foundation Excavation Including Haul & Disposal
Bid Tab 1060 From B&D Levee Project
0
CY
$17.00
$0.00
$0.00
Rock for Erosion & Scour Protection (Class A)
Bid Tab 1326 B&D Levee
0
TON
$48.00
$0.00
$0.00
Subtotal
$0.00
$0.00
Fill Placement and Compaction
Gravel Borrow Including Haul and Compaction
Bid Tab 1075 from B&D Levee Project
5.53
TON
$20.00
$110.60
$17,696.00
Geo-Grid Soil Reinforcement
RS Means
0
SF
$0.81
$0.00
$0.00
Jute Mesh
Bid Tab 8025 from B&D Levee Project
0
SY
$1.30
$0.00
$0.00
Subtotal
$110.60
$17,696.00
Erosion Control, Surface Treatments, and Plantings
TESC
Bid Tab Schedule VII B&D Levee
1
LF of River
$51.28
$51.28
$8,204.80
Landscaping
Bid Tab Schedule VIII B&D Levee
1
LF of River
$100.00
$100.00
$16,000.00
Subtotal
$151.28
$24,204.80
Mobilization, Contingency, Misc., and Totals
Total Unit Costs
$262
$41,901
Mobilization
Assumed Values
10.0%
LS
$26
$4,190
Contingency
Assumed Values
15.0%
LS
$39
$6,285
Miscellaneous Costs
Assumed Values
10.0%
LS
$26
$4,190
Sales Tax
Washington State
9.5%
LS
$25
$3,981
Estimated Totals
$378
$60,547
0
APPENDIX D
Trail Easement Agreement
• r ..•
!• .
7 •
•
1.•-'
EASEMENT
4 ,
•• •
PropoSed16-20-79 •
14F:#70417SMO-
na
THIS INSTRUMENT made this day of 044)(4,414ye- , ,19111°. ., •
hy.Gary A. Nilsen Sr,. and L.O. Schneidei. (the "Granto s").-in favor of CITY OF'• •
• TUKWILA, a muniCipal corporation of King County, State .of Wishing* (the %mane"). -
WITNESSETH •
• . , .
.GrantOrs, for and in consideration of the sum of one dollar (1.00) and -other
171:
valuable consideration, receipt of which is acknowledged, Grantors grants,. -con,
rl Neys', and-conf-rms to Grantee, its successors and assigns, a perpetual non-exclusive -,
easement -for public.acteis for the purpose of constructing and operating'a recreational
l_J. CD
trail open to the public,. and related construction and improvements, across and
upon the property described on the attached "Exhibit A" and further shown on the map
attached as "Exhibit II".
-00
Grantee shall have the right without prior institution of suit or proceeding at
law, at such time as may be deemed appropriate by Grantee, to enter upon said
property for the purpose of operatingmaintaining, repairing, replacing.or re-
fl •
constructing a public. recreational trail and related improvements, without incur-
ring legal obligations or liability therefor: provided, said operating. Maintain-
ing, repairing, replacing, or reconstructing of a.public recreational trail or
related improvements shall be accomplished in such a manner that private improve-
r- ments shall not be disturbed or destroyed. and Grantors shall not be excluded from .
such easement property and shall have unlimited right to use said easement property
for any lawful purposes not inconiistant with the rights of grantee. In the event
they are disturbed or destroyed, they will be replaced in as good a condition. .
as they.were immediately before the property was entered upon by Grantee.
This -shall be a covenant running with the land forever and shall be binding on
GrantorsSuccessors; heirs and assigns.
n
n
fl
By:
i% EXOSE 'FAX NO1 REQUIRED •
Hing Co ftecord.o Division
81. Depiny.
I
N1.1-hskti,ste:IR'efl.4111 s
• . • .
• • • ..••• c ,• s' ..;••• :•••••!.•
r•
•
f
EXHIBIT A
Tfie•pedestrian access easement as, described in the easement agreement shall:be.,
from the ordinary•high water mark to a point 40 feet west of said -ordinary high
water mark over. 'all of the' following parcels, of land:
•
•LEGAL.DESCRIPTIONS:
•
That portion of Tract,1, Interurban Addition to -Seattle, according to the'
plat.recorded in Volume 10 of'Plats, page 55, records of King County, -
Washington, lying southerly of a line which extends northeasterly,,perpen-
dicular with the westerly line of said tract, from a point•on said westerly,'
line which is 685 feet southeasterly from the northwest corner of said
'tract; and lying northerly of a line which extends northeasterly, perpen-
dicular with the westerly line of said tract, from a point on said westerly
line'which•is 1555 feet southeasterly from the northwest corner.of said
tract;'ALSO that,portion of the vacated Puget Sound Electric Railway R/W
adjoining'thereto lying southeasterly of S. 149th St. as conveyed by
Puget Sound Power and Light Co. to the City of Tukwila by deed dated
October 25,4965 and filed under Auditor's File No. 6557639; and lying
northwesterly of a line which extends southwesterly, perpendicular with
the easterly line of said P. S. E. R/W, which is also the westerly line
of said Tract 1, Interurban Addition, from a point on said westerly 'line
,hick is 1555 feet southeasterly -from the northwest corner of said tract.
;1; ip•7yq� ?y��Y"4 1.: :t1 '}:k=-i%}•�?�t4.#�}
.':STATE OF:;WASHINGTON)
ss.
COUNTY OF. KING )
On this % day Of ��- k'.1 / l�-•� ; before.•me .personally
:appeared ;- 4. J-�
and. '.._�� �t. .
:"•to the known t"6 be
� -ter. Q•=��..a �
the-
.
•
•
of• • .mac �^� w� .s�."9�� - Ai,'
.,the•individuals that executed the foregoing instrument, nd acknowledged the`said
instrument to be the free and voluntary act and deed of said individuals for -the
.uses and purposes mentioned therein, and on oath stated that they were authorized
to execute the'said instrument.
s�lc
NOTARY PUBLI in and fgr`'the to of Wash-
ington, res d'ng at /: ,...1
-2-
ea'; 4 1� 4uS3zM-4 ri•-i itll
•
:1r4•
.71
., .,'
•
Lr
1 T /,`ae► r
7JtYfI' tp'
r
• i
1
1
r ;
•
y;41.
• V• O V
„tr.?
•
1J
n
•
1/40
3x? 5S r� {
. PA1
• E1LED tor. !Word at rteqtiest ,ot
`U
\.
City of Tukwila
Jim Haggerton, Mayor
Department of Community Development Jack Pace, Director
July 14, 2015
GeoEngineers, Inc.
Attn: Thomas Banister
600 Stewart Street, Suite 1700
Seattle, WA 98101
tban nister @ geoengineers.com
Subject: Correction Letter #1
Green River Bank Erosion Repair
L15-0032, E15-0007
Dear Mr. Banister:
The City is in the process of reviewing your applications for Shoreline Substantial Development and SEPA
permits to install a subsurface drainage system and restore an eroded bank on the Green River located at
14900 Interurban Ave. South. Please address the following comments and resubmit relevant documents.
Departmental comments are listed below along with reviewer contact information:
Public Works —Dave McPherson (206) 431-2448:
SEPA — E15-0007
The Environmental Checklist should be revised as follows:
B. Environmental Elements
5. Animals
c. Yes — This area is part of the Pacific Flyway. A primary corridor for migratory bird species.
SHORELINE — L15-0032
Ref. GeoEngineers Report dated June 18, 2015 -
Pgl, Site Description - The river is tidally influenced at this point at the uppermost point. Revise the
document: Yes — work is at approximately river mile 11.4 and the title influence from recent Green River
studies extends as far as river mile 12. USGS considers 200th Street in Kent (river mile 17) to be the
spatial extent of the tidal influence.
Page 5 of GeoEngineers Report 1st paragraph states "To accommodate this slope angle, the existing asphalt
trail at the top of the bank may need to be realigned". Will the trail be replaced and will it have the same
alignment?
W:\Users\Valerie\SEPA\E15-0007 Green River Bank Repair\Correction Letter #1
Page 1 of 2 6/24/2015
Thomas Banister
Green River Bank Erosion Repair
L15-0032/E15-0007
Building —Allen Johannessen (206) 433-7163:
No comments at this time,.
Fire —Don Tomaso (206) 971-8723:
No comments at this time.
Planning —Valerie Lonneman (206) 433-7140:
SEPA — E15-0007
• Pg3e — Provide answer
• Pg4g — Discuss trail in impermeable section
• Pg4h — Provide details of erosion control and contingencies
• Pg4c — Salmon are endangered and near the sight
SHORELINE — L15-0032
• Pg1, Site Description - The river is tidally influenced at the uppermost point. Revise the
document to reflect this.
• Pg5 — Please provide details of the proposed Tree Protection if it will vary from the code.
• Pg5 — Please provide the approximate square footage of the project (to verify for tree count).
• Pg6 — Erosion control details should be provided, both for proposed and contingency. When will
you determine if contingency is needed? Do you plan to do turbidity testing?
• Pg6 — Please provide a maintenance plan/detail from the building owner. How often? Watering?
etc.
• Pg6 — Watering is needed for first three years from at least July to October, depending on
conditions. How will the site be watered?
• Pg7 — Given the small size of the site, is it possible to monitor the whole site in lieu of
establishing a transect? Photos will be required.
Additional comments:
• Please provide more information on how the fabric will affect recruitment? How long does it
take to break down? Is mulch to be used?
• Please provide diagram of planting extent — how far toward OHW will you plant? Consider
using willow stakes at base of slope.
Please feel free to contact me with any questions at (206) 433-7140.
Sincerely,
7/l%y
Valerie Lonneman
Assistant Planner
Page 2 of 2
City of Tukwila
Jim Haggerton, Mayor
Department of Community Development Jack Pace, Director
July 16, 2015
Thomas Bannister
GEO Engineers
600 Stewart Street, Ste# 1700
Seattle WA 98101
RE: Notice of Application — Green River Bank Repair
File# PL15-0027, L15-0032 & E15-0007
Shoreline and SEPA
Subsurface Drainage System
Dear Mr. Bannister:
r
There is a fee due on your permit application in the amount of $399.00 to cover fees associated with
mailing the attached public notice - Notice of Application, Shoreline and SEPA
The number of required notices sent for your application was 399 which included property owners and
tenants within 500 feet of your project site as well as interested parties and agencies with jurisdiction.
The cost is based on the land use fee schedule adopted by Resolution Number 1845 covering Public
Notice mailings required for your application. This fee covers the attached notice only. Additional fees
may be assessed for future mailings or other review tasks per the fee schedule.
This amount needs to be paid before the city can continue processing your permit application. The
payment may be paid by cash, check or credit card. The city will accept credit card payments by phone.
If paying by check please send the check made out to:
City of Tukwila
Attn: Teri
6300 Southcenter Blvd, Ste 100
Tukwila, WA 98188
If you have any questions, please feel free to contact me at Teri.Svedahl@TukwilaWA.gov
Sincerely,
Teri Svedahl
Administrative Support Technician
Cc; Valerie Lonneman, City Planner
MD
Invoicing Public Mailings.doc
Page 1 of 1 07/15/2015
6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone 206-431-3670 • Fax: 206-431-3665
1
f�
/0400
TO:
City of Tukwila
Department of Community Development
RECEIVF
!JUL 02 2015
TUKW�-
PUBLIC WORK'
File Number
E15-0007 (SEPA)
L,15-0032 (Shoreline)
LAND USE PERMIT ROUTING FORM
Building ❑i Planning -Public Works Fire Dept. ❑! Police Dept.
C
Parks/Rec
Project:
Green River Bank Erosion Repair
Address:
14900 Interurban Ave S., Tukwila, Washington
Date
transmitted: July 1, 2015
Response
requested by: July 15, 2015
Staff
coordinator: Valerie Lonneman
Date response
received:
REVIEWERS: Please specify how the attached plans conflict with your ADOPTED
development regulations, including citations. Be specific in describing the types of changes you
want made to the plans. When referencing codes, please identify the actual requirement and
plan change needed.
The Planning Division review does not supplant each department's ability to administer its own
regulations and permits. However, project consistency at the Planning review stage is
important to minimize significant later design changes. More than minimal design changes
require further Planning Commission review, even if alteration is required to satisfy a City
requirement. This further review is typically a minimum 60-day process.
Requirements based on SEPA (e.g., not required by an adopted development regulation)
MUST identify the impact being mitigated, the policy basis for requiring mitigation, and the
method used to calculate the mitigation required. Calculations of project impacts and the
mitigation required (e.g., water capacity, road level of service analyses, or turning analyses)
may be required of the applicant.
COMMENTS
(Attach additional comment sheets and/or support materials as needed.)
This application is for SEPA and Shoreline Substantial Development review.
Eis--oeoi c`t se -PA �L,ec.�liSQ-
(see_ f}rr ccL6_b.
tlScrG CV04k Vt6ti) =a1-1�rF Jt.
Plan check date:
Comments
i
Update date:
�/i c/i S
prepared by:
b w
`
CITY OF TUKWILA
PUBLIC WORKS DEPARTMENT
REVIEW COMMENTS
www.tukwila(@tukwilawa.gov
Development Guidelines and Design and Construction Standards
TO: PLANNING DIVISION — Valerie Lonneman, Assistant Planner
/0I47/V1
FROM: PUBLIC WORKS DEPT. — David McPherson, Development Engineer
(206) 431-2448
David. McPherson(a�TukwilaWA.gov
DATE: July 10, 2015
SUBJECT: Green River Bank Erosion Repair at 14900 Interurban Ave. South
TL no. 359700-0006
SEPA and Shoreline review comments
SEPA — E15-0007
Public Works has the following SEPA review comments.
The Environmental Checklist should be revised as follows:
B. Environmental Elements
5. Animals
c. Yes — This area is part of the Pacific Flyway. A primary corridor for migratory bird
species.
SHORELINE — L15-0032
Public Works has no Shoreline review comments.
Page 1 of 1
f \
0400
TO:
City of Tukwila
Department of Community Development
File Number
E15-0007 (SEPA)
L15-0032 (Shoreline)
LAND USE PERMIT ROUTING FORM
Building
Planning
❑I
Public Works
Fire Dept.
Police Dept.
Parks/Rec
Project:
Green River Bank Erosion Repair
Address:
14900 Interurban Ave S., Tukwila, Washington
Date
transmitted: July 1, 2015
Response
requested by: July 15, 2015
Staff
coordinator: Valerie Lonneman
Date response
received:
REVIEWERS: Please specify how the attached plans conflict with your ADOPTED
development regulations, including citations. Be specific in describing the types of changes you
want made to the plans. When referencing codes, please identify the actual requirement and
plan change needed.
The Planning Division review does not supplant each department's ability to administer its own
regulations and permits. However, project consistency at the Planning review stage is
important to minimize significant later design changes. More than minimal design changes
require further Planning Commission review, even if alteration is required to satisfy a City
requirement. This further review is typically a minimum 60-day process.
Requirements based on SEPA (e.g., not required by an adopted development regulation)
MUST identify the impact being mitigated, the policy basis for requiring mitigation, and the
method used to calculate the mitigation required. Calculations of project impacts and the
mitigation required (e.g., water capacity, road level of service analyses, or turning analyses)
may be required of the applicant.
COMMENTS
(Attach additional comment sheets and/or support materials as needed.)
This application is for SEPA and Shoreline Substantial Development review.
Seer Ct-- C 15 -cc 7 6-1-Iz c c ke_cid-, s
Plan check date:
7-/-5
comments
prepared by:
Update date:
N
at* of J aftwiea
Department Of Community Development
AFFIDAVIT OF DISTRIBUTION
I, _Teri
Svedahl ,
HEREBY DECLARE THAT:
x
Notice of Application
Notice of Decision
Notice of Public Hearing
Notice of Public Meeting
Determination of Non-
Significance
Mitigated Determination of Non -
Significance
Determination of
Significance & Scoping
Notice
Short Subdivision Agenda
Notice of Application for
Shoreline Mgmt Permit
Shoreline Mgmt Permit
Board of Appeals Agenda
Packet
Board of Adjustment Agenda Packet
Official Notice
Notice of Action
Other:
Was mailed to each of the addresses listed/attached
on this _ 16th day of _July 2015
Project Name: Green River Bank Repair
Project Number: PL15-0027
Associated File Number (s): L15-0032, E15-0007
Mailing requested by: Valerie nneman
Mailer's signature: 7)�viA.,,,,/C `-._ __
W:\USERS\TERI\TEMPLATES-FORMS\AFFIDAVIT OF DISTRIBUTION.DOC
f `\
L. !
City of Tukwila Notice Of Application
Green River Bank Repair
Project Description: Install a subsurface drainage system
and restore an eroded bank on the Green River at 14900 Inter-
urban Ave. South. The project will receive Shoreline Substantial
Development and SEPA (State Environmental Policy Act) deter-
minations.
File #'s: L15-0032, E15-0007
Property Owner: Kurt Schneider
Applicant: Thomas Bannister, GeoEngineers, Inc.
Project Planner: Valerie Lonneman
206-433-7140 or Valerie.Lonneman@TukwilaWA.gov
Comments and Appeals: Your written comments on the pro-
ject are requested and can be sent to Department of Community
Development, 6300 Southcenter Blvd., Suite 100, Tukwila, WA
98188 or via email to Valerie.Lonneman@TukwilaWA.gov.
Comments on SEPA must be received before or on July 30
by 5:00 pm; comments on the Shoreline review must be re-
ceived before or on August 17 by 5:00 pm. To request a copy
of any decision or information on your appeal rights, please call
206-433-7140.
City of Tukwila Notice Of Application
Green River Bank Repair
to
t5.
5,749th St , )
S 15 st,5t�
Project Description: Install a subsurface drainage system
and restore an eroded bank on the Green River at 14900 Inter-
urban Ave. South. The project will receive Shoreline Substantial
Development and SEPA (State Environmental Policy Act) deter-
minations.
File #'s: L15-0032, E15-0007
Property Owner: Kurt Schneider
Applicant: Thomas Bannister, GeoEngineers, Inc.
Project Planner: Valerie Lonneman
206-433-7140 or Valerie.Lonneman@TukwilaWA.gov
Comments and Appeals: Your written comments on the pro-
ject are requested and can be sent to Department of Community
Development, 6300 Southcenter Blvd., Suite 100, Tukwila, WA
98188 or via email to Valerie.Lonneman@TukwilaWA.gov.
Comments on SEPA must be received before or on July 30
by 5:00 pm; comments on the Shoreline review must be re-
ceived before or on August 17 by 5:00 pm. To request a copy
of any decision or information on your appeal rights, please call
206-433-7140.
AGENCY
US ARMY CORP OF ENGINEERS
OFFICE OF ARCHAEOLOGY
WSDOT NW REGION
DEPT OF NATURAL RESOURCES
WA FISHERIES & WILDLIFE
DEPT OF ECOLOGY
WA DEPT OF ECOLOGY
WA STATE ATTORNEY GENERAL
KC PARKS & RECREATION
KC ASSESSOR'S OFFICE
KC DEV & ENVIRON SERVICES
KC METRO TRANSIT/SEPA OFFICIAL
KC DEPARTMENT OF NAT'L RESOURCES
FOSTER LIBRARY
WESTFIELD MALL LIBRARY
SEATTLE PUBLIC SCHOOLS
SEATTLE CITY LIGHT
SEATTLE PLANNING & DEVELOPMENT
SEATTLE PUBLIC UTILITIES
WASTE MANAGEMENT
CITY OF SEATTLE
MUCKLESHOOT Cultural Resources Program
MUCKLESHOOT Fisheries Program
MUCKLESHOOT Wildlife Program
DUWAMISH INDIAN TRIBE
PUGET SOUND CLEAN AIR AGENCY
SOUND TRANSIT/SEPA OFFICIAL
DUWAMISH RIVER CLEAN UP COALITION
WA ENVIRONMENTAL COUNCIL
PEOPLE FOR PUGET SOUND
DEPT
DEVELOPMENT SERVICES
NW REGIONAL OFFICE
SEPA REVIEW
ECOLOGY DEPARTMENT
ACCOUNTING DIVISION
SEPA INFO CENTER
ENVIRONMENTAL PLANNING
SEPA Review / Joe Wolf
ENVIRONMENT & SAFETY DIV
WATER DEPARTMENT
JALAINE MADURA, SEPA
SEPA CONTROL PLANNING & DEVEL
Laura Murphy
Karen Walter
Mike Middleton
SEPA REVIEW
UNION STATION
ADDRESS
4735 E MARGINAL WY S
PO BOX 48343
PO BOX 330310, MS 240
PO 47015
16018 MILL CREEK BLVD
3190 160th AVE SE
PO BOX 47703
PO BOX 40117
201 S JACKSON ST., STE 700
S00 4th AVE, RM# 709A
35030 SE Douglas Street, Ste 210
201 S JACKSON ST., MS KSC-TR-0431
201S JACKSON ST., STE 600
4060 S 144th STREET
1386 SOUTHCENTER MALL
PO BOX 34165 MS 22-332
PO BOX 34023
PO BOX 34019
PO BOX 34018
8111-1st AVE S
PO BOX 34019
39015 172nd AVE SE
39015 172nd AVE SE
39015 172nd AVE SE
4705 W MARGINAL WAY SW
1904 3rd AVENUE, STE 105
401 S JACKSON STREET
210 S Hudson Street, Ste 332
1402 THIRD AVE, STE# 1400
1402 - 3rd Ave, Ste 1400
CITY ST ZIP
SEATTLE WA 98124
OLYMPIA WA 98504
SEATTLE WA 98133
OLYMPIA WA 98504
MILL CREEK WA 98012
BELLEVUE WA 98008
OLYMPIA WA 98504
LACEY WA 98504
SEATTLE WA 98104
SEATTLE WA 98104
SNOQUALMIE WA 98065
SEATTLE WA 98104
SEATTLE WA 98104
TUKWILA WA 98168
TUKWILA WA 98188
SEATTLE WA 98124
SEATTLE WA 98124
SEATTLE WA 98124
SEATTLE WA 98124
SEATTLE WA 98108
SEATTLE WA 98124
AUBURN WA 98092
AUBURN WA 98092
AUBURN WA 98092
SEATTLE WA 98106
SEATTLE WA 98101
SEATTLE WA 98104
SEATTLE WA 98134
SEATTLE WA 98101
SEATTLE WA 98101
NAME
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
TEAMSTERS BLDG ASSOC
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
TUKWILA COMMUNITY MEMBER
MAPLE CREST APARTMENTS
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
ADDRESS
100 ANDOVER PARK W # 150
10607 DES MOINES MEMORIAL DR
10955 SE 169TH PL
1125 E 60TH ST
11310 148TH AVE SE
11627 SE 192ND ST
119 S 60TH
11903 SE 71ST PL
1214 TAYLOR AVE N # 301
12811 12TH AVE S
12909 13TH PL NE
12918 1ST AVE SW # B
1299 UNION RD # C109
1333 32ND PL NE
13404 173RD ST E
13729 SE 256TH PL
1425 SANFORD DR
14675 INTERURBAN AVE S # 303
14800 INTERURBAN AVE S
14800 STARFIRE WAY
14805 INTERURBAN AVE S
14851 INTERURBAN AVE S
14891 INTERURBAN AVE S
14893 INTERURBAN AVE S
14895 INTERURBAN AVE S
14900 INTERURBAN AVE S
14901 INTERURBAN AVE S
14903 INTERURBAN AVE S
14925 INTERURBAN AVE S
14928 18TH SW
14973 INTERURBAN AVE S
15100 65TH AVE S
15130 65TH AVE S
1525 4TH AVE STE 400
15410 SE 272ND ST # 39
1546 65TH AVE S # 503
15510 6TH AVE SW # 1
1607 DES MOINES MEMORIAL DR
16215 9TH AVE SW
16360 SIMONDS RD NE
1800 9TH AVE # 11TH FL AMAZON M
18107 NORMANDY TER SW
1824 MAPLE LN # K59
19752 40TH AVE S
20221 90TH PL S
20410 33RD AVE NE
21250 SE 42ND PL
CITY ST
TUKWILA WA
SEATTLE WA
RENTON WA
TACOMA WA
RENTON WA
KENT WA
TACOMA WA
NEWCASTLE WA
SEATTLE WA
BURIEN WA
LAKE STEVENS WA
BURIEN WA
KIHEI HI
AUBURN WA
PUYALLUP WA
KENT WA
FORT COLLINS CO
TUKWILA WA
TUKWILA WA
TUKWILA WA
TUKWILA WA
TUKWILA WA
TUKWILA WA
TUKWILA WA
TUKWILA WA
TUKWILA WA
TUKWILA WA
TUKWILA WA
TUKWILA WA
BURIEN WA
TUKWILA WA
TUKWILA WA
TUKWILA WA
SEATTLE WA
KENT WA
TUKWILA WA
BURIEN WA
SEATTLE WA
BURIEN WA
KENMORE WA
-RM SEATTLE WA
NORMANDY PARK WA
KENT WA
SEATAC WA
KENT WA
SEATTLE WA
ISSAQUAH WA
ZIP
98188
98168
98055
98404
98168
98031
98404
98056
98109
98168
98258
98146
96753
98002
98374
98042
80526
98168
98188
98188
98188
98188
98188
98188
98188
98188
98188
98188
98188
98166
98188
98188
98188
98101
98042
98188
98166
98168
98166
98028
98101
98166
98030
98188
98031
98155
98029
r 1
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
COMMUNITY MEMBER
2131 LOWER PEOH POINT RD
21403 96TH AVE S
22302 97TH AVE W
23628 SE 127TH CT
23987 58TH CT S # D2
24115 118TH PL SE
2430 169TH PL SE
2450 38TH ST
2702 CEDAR AVE S
2717 76TH AVE SE # 103
27758 214TH AVE SE
30028 45TH AVE S
3046 ALKI AVE SW # 103
3325 59TH AVE SW
33638 38TH AVE S
3794 EMILIA DR
4368 CLAIREMONT MESA BLVD # 60
4509 160TH PL SE
4556 12TH AVE S
4720 MILL POND DR SE # 507
4801 FREDERICA ST
486 SUMMIT AVE
5008 S ROSE ST
5703 S LEO ST
5732 S RYAN ST
6230 S 149TH PL
625 ILWACO AVE NE
6250 S 151ST ST
644 SHREWSBURY COMMONS AVE #
6750 FRANCIS LOOP SE
705 E DECATUR ST
7320 E GREENLAKE DR N # 202
7517 GREENWOOD AVE N
7914 S 120TH ST
8017 141ST AVE SE
8616 42ND AVE S
8624 RENTON AVE S
900 SW 16TH ST STE 200
901 POWELL AVE SW STE 101
931 14TH ST STE 103
950 N 72ND ST # 100
9748 57TH AVE S
PO BOX 1463
PO BOX 16597
PO BOX 251006
PO BOX 3095
PO BOX 88665
CLE ELUM WA
KENT WA
EDMONDS WA
KENT WA
KENT WA
KENT WA
BELLEVUE WA
BELLINGHAM WA
RENTON WA
MERCER ISLAND WA
MAPLE VALLEY WA
AUBURN WA
SEATTLE WA
SEATTLE WA
FEDERAL, WAY WA
PORT ORANGE FL
SAN DIEGO CA
BELLEVUE WA
SEATTLE WA
AUBURN WA
OWENSOBORO KY
MAPLEWOOD NJ
SEATTLE WA
SEATTLE WA
SEATTLE WA
TUKWILA WA
RENTON WA
TUKWILA WA
192 SHREWSBURY PA
AUBURN WA
TULSA OK
SEATTLE WA
SEATTLE WA
SEATTLE WA
NEWCASTLE WA
SEATTLE WA
SEATTLE WA
RENTON WA
RENTON WA
DENVER CO
SEATTLE WA
SEATTLE WA
RENTON WA
SEATTLE WA
GLENDALE CA
RENTON WA
TUKWILA WA
98922
98031
98020
98031
98032
98030
98008
98229
98055
98040
98038
98001
98116
98116
98001
32127
92117
98006
98108
98092
42301
7040
98118
98178
98178
98168
98059
98188
17361
98092
74011
98115
98103
98178
98059
98118
98118
98057
98057
80202
98103
98118
98057
98116
91225
98056
98138
NAME ADDRESS CITY ST ZIP
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 1 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 10 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 12 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 13 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 14 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 15 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 16 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 17 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 18 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 2 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 3 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 4 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 5 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 6 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 7 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 8 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14893 INTERURBAN AVE Apt 9 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 37 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 38 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 39 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 40 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 41 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 42 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 43 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 44 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 45 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 46 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 47 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 48 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 49 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 50 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 51 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 52 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 53 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14895 INTERURBAN AVE Apt 54 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 55 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 56 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 57 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 58 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 60 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 61 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 62 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 63 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 64 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 65 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 66 TUKWILA WA 98168
/ 1 f
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 67 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 68 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 69 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 70 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 71 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14897 INTERURBAN AVE Apt 72 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 73 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 74 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 75 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 76 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 77 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 78 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 79 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 80 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 81 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 82 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 83 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 84 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 85 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 86 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 87 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 88 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 89 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14899 INTERURBAN AVE Apt 90 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 100 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 101 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 102 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 103 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 104 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 105 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 106 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 107 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 108 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 91 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 92 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 93 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 94 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 95 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 96 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 97 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 98 TUKWILA WA 98168
TUKWILA COMMUNITY MEMBER 14901 INTERURBAN AVE Apt 99 TUKWILA WA 98168
/
NAME ADD STREET unit # CITY ST ZIP
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 101 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 102 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 103 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 104 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 105 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 106 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 107 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 108 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 109 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 110 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 111 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 112 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 113 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 114 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 115 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 116 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 117 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 118 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 119 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 120 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15138 65TH AVE S # 121 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 201 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 202 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 203 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 204 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 205 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 206 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 207 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 208 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 209 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 210 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 211 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 212 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 213 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 214 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 215 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 216 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 217 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 218 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 219 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 220 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15140 65TH AVE S # 221 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 301 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 302 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 303 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 304 TUKWILA WA 98188
/ \
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 305 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 306 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 307 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 308 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 309 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 310 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 311 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 312 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 313 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 314 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 315 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 316 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 317 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15142 65TH AVE S # 318 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 401 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 402 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 403 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 404 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 405 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 406 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 407 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 408 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 409 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 410 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 411 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 412 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 413 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 414 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 415 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 416 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 417 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15144 65TH AVE S # 418 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 501 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 502 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 503 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 504 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 505 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 506 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 507 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 508 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 509 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 510 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 511 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 512 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 513 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 514 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 515 TUKWILA WA 98188
/
7.1
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 516 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 517 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15146 65TH AVE S # 518 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15148 65TH AVE S # 601 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15148 65TH AVE S # 602 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15148 65TH AVE S # 603 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15148 65TH AVE S # 604 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15148 65TH AVE S # 605 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15148 65TH AVE S # 606 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15148 65TH AVE S # 607 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15148 65TH AVE S # 608 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15148 65TH AVE S # 609 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15148 65TH AVE S # 610 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15148 65TH AVE S # 611 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15148 65TH AVE S # 612 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 701 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 702 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 703 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 704 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 705 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 706 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 707 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 708 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 709 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 710 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 711 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 712 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 713 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 714 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 715 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 716 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 717 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 718 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 719 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 720 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 721 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 722 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 723 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15150 65TH AVE S # 724 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 801 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 802 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 803 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 804 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 805 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 806 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 807 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 808 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 809 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 810 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 811 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 812 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 813 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 814 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 815 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 816 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 817 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 818 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 819 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 820 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 821 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 822 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 823 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15152 65TH AVE S # 824 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15154 65TH AVE S # 825 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15154 65TH AVE S # 901 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15154 65TH AVE S # 902 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15154 65TH AVE S # 903 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15154 65TH AVE S # 904 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15154 65TH AVE S # 905 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15154 65TH AVE S # 906 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15154 65TH AVE S # 907 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15154 65TH AVE S # 908 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15154 65TH AVE S # 909 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15154 65TH AVE S # 910 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15154 65TH AVE S # 911 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15154 65TH AVE S # 912 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1001 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1002 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1003 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1004 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1005 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1006 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1007 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1008 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1009 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1010 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1011 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1012 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1013 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1014 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1015 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1016 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1017 TUKWILA WA 98188
TUKWILA COMMUNITY MEMBER 15156 65TH AVE S # 1018 TUKWILA WA 98188
1 / 1
Teri Svedahl
From: Teri Svedahl
Sent: Thursday, July 16, 2015 7:35 AM
To: 'sepaunit@ecy.wa.gov'
Cc: Valerie Lonneman
Subject: Green River Bank Repair, Tukwila
Attachments: PL15-0027 Half Sheet Notice.pub
Attached is Notice of Application for a Tukwila project to restore an eroded bank on the Green River.
Please contact Valerie Lonneman with any questions.
Valerie.Lonneman@TukwilaWA.Rov
Teri Svedahl !Administrative Support Technician
City of Tukwila I Planning Department
6300 Southcenter Boulevard - Ste 100 I Tukwila WA 98188
Teri.Svedahl n@Tukwila WA.gov
The City of opportunity, the community of choice.
Please be advised: This email is subject to public disclosure
CO'51)
lc los
oP�e ''`
O°
June 18, 2015
LD Schneider and Associates
3200 North Central Avenue, Suite 1470
Phoenix, Arizona 85012
Attention: Kurt Schneider
Subject: Analysis and Design Report
Green River Bank Repair
14900 Interurban Avenue South
Tukwila, Washington
GeoEngineers File No. 21493-001-01
INTRODUCTION
GEOENGINEER S....0
Plaza 600 Building
600 Stewart Street, Suite 1700
Seattle, Washington 98101
206.728.2674
GeoEngineers, Inc. (GeoEngineers) is pleased to present an analysis of site conditions and a design to
repair an eroding bank along the Green River adjacent to the property at 14900 Interurban Avenue South
in Tukwila, Washington. The location of the site is mapped on Sheet C-1 in Appendix A. The purpose of this
report is to support an application to the City of Tukwila for a Shoreline Substantial Development Permit
and to the Washington State Department of Fish and Wildlife (WDFW) for a Hydraulic Project Approval (HPA).
We prepared this report to comply with the submittal requirements of Tukwila Municipal Code (TMC) 18.44.
GeoEngineers assessed the causes of bank failure and developed multiple design alternatives for
consideration by the owner. We also evaluated the permitting considerations of each option. As part of our
preliminary work, we completed a site assessment and developed a design to address the mechanisms of
bank failure. This report details our methods and findings regarding site conditions, mechanism of
failure and presents permit level design drawings to mitigate for bank failure and restore the bank to a
functional condition.
SITE DESCRIPTION AND CONDITIONS
The 3.6-acre property (Parcel #3597000006) is located on the left (west) bank of the Green River. An
approximately 57,000 square -foot, 2-story office building and parking areas are located on the parcel. The
parcel is generally flat and the river is not leveed. The Green River is not tidally influenced at this location
and overbank bank flooding is extremely rare, particularly on the left bank of the river. The area of the
parcel that is within 200 linear feet of the Ordinary High Water Mark (OHWM) of the Green River is
regulated under the City of Tukwila's Shoreline Master Program. The Shoreline designation for the site is
Urban Conservancy and the River has a buffer of 100 feet measured from 01-IWM. The site is also
designated as a Fish and Wildlife Habitat Conservation Area per TMC 18.44.090 H.
LD Schneider and Associates June , 2015 Page 2
A GeoEngineers biologist made a preliminary site visit on May 13, 2014. In general, the riverbank on the
property is vegetated with noxious and invasive Himalayan blackberry. Because of the infestation of
Himalayan blackberry and lack of trees, habitat conditions along the riverbank are degraded. GeoEngineers
observed evidence of a recent slough of the bank located approximately 100 feet southeast of the
commercial building on the property. The recent sloughing resulted in an approximately 10-foot high near
vertical escarpment that damaged an existing asphalt trail at the top of the bank. The trail is separated
from the parking lot by a landscaping island consisting of grass and a row of seven mature sycamore trees.
The biologist also observed water weeping from the bank at the toe of the escarpment. The biologist did
not observe environmentally sensitive areas, such as wetlands, during the site reconnaissance.
0n August 12, 2014, a GeoEngineers geotechnical engineer, river hydrologist, and biologist evaluated slope
stability, habitat, and flow conditions at the site. During this site visit, the geotechnical engineer noted that
the soil exposed in the riverbank consisted of fine to medium silty sand and silt. This material is typical of
alluvium in the Green River valley. Bedrock was observed in the riverbanks upstream (south) of the property.
Bedrock is also known to be present (State of Washington Department of Natural Resources [DNR] Geology
Maps) on the hillside t.o the west of the site.
DNR maps the local geologic unit as the Puget Group (Tp). The Puget Group consists of sandstone, siltstone,
claystone, and coal which is white and very fine grained to gritty. The Tiger Mountain Formation, which
consists of light-colored, medium -grained sandstone with siltstone, minor pebble conglomerate, and coal
beds, is mapped in isolated outcrops in the river valley. The Renton Formation (Tpr), which is a fine- to
coarse -grained sandstone with interbedded siltstone, claystone, and coal, is mapped on the hillside to the
west of the site. Alluvial deposits (Qal) are mapped immediately adjacent to the site as comprising the river
bed and riverbanks. Alluvium is described as a mix of moderately to poorly sorted granular soils deposited
by the river.
We completed two subsurface geologic explorations at the top of the recently sloughed area where the trail
has become undermined and approximately halfway between this point and the corner of the building.
These explorations were performed with a track -mounted drill rig and advanced to a depth of 36.5 feet (at
the top of the slough) and 51.5 feet (nearer to the building). Summary logs of our explorations are included
as Appendix A.
The subsurface conditions at the site is consistent with a glacial channel that was carved into siltstone and
sandstone and then partially filled with more recent allluvium from the Green River. We observed the
alluvium to consist of very loose to medium dense silty sand to a depth of approximately 35 feet. We
observed the silty sand material to overlie a white to light gray sandstone with fine inclusions of coal layers.
We interpret this sandstone to be a part of the Tiger Mountain Formation of the Puget Group. The two
borings were terminated within the sandstone.
We observed groundwater in the borings at a depth of approximately 12-14 feet below ground
surface, which is consistent with earlier observations of groundwater seeping out from the toe of the
sloughed surface.
GEOENGINEERS.
File No. 21493-001-01
f\
LD Schneider and Associates June 1, 2015
Page 3
MECHANISM OF BANK SLOUGHING
Based on our observations at the site and experience in the Green River valley, it is our opinion that the
bank sloughing is most likely due to a drawdown failure. This type of failure occurs when high groundwater
levels and high river levels saturate the riverbank soil and then the river levels drops or "draws down" faster
than the water can drain from the riverbank soil. This creates an imbalance of water pressure. The water
pressure pushing the bank from within the soil is no longer balanced by the water pressure from the river
and the riverbank is pushed into the river. In our experience, this is the most common riverbank failure
mechanism on the lower Green River.
Toe erosion is also a failure mechanism that is common on the Green River and often found in conjunction
with drawdown failures. Toe erosion will weaken a riverbank but the ultimate failure is triggered by
drawdown. At this site, the presence of shallow bedrock makes toe erosion less likely to be a significant
contribution to the failure of the riverbank.
In addition to site observations, bathymetric data of the channel bottom was obtained from King County.
Cross sections of the channel bottom in the vicinity of the site do not show the large scour holes typically
evident in areas where toe erosion is a major contributor to slope instabilities. We do not believe toe erosion
to be a contributing factor in the of bank sloughing at the site.
PROJECT DESIGN
We developed a permit -level design to mitigate for the bank sloughing and also to address potential future
drawdown failures. Permit level design drawings are included as Attachment B. The design objective was
to develop a plan appropriate for the site geology and geometry using techniques and materials most likely
to be approved by regulatory agencies and offer long term protection. During preliminary design, we
considered bio-engineered and hard engineering approaches. The identified design options are located
landward of the OHWM for permitting efficiency. Additionally, we believe work waterward of OHWM is
unnecessary because the mechanism of failure is not a result of toe erosion. As such, the project will avoid
impacts to aquatic habitat at the site.
Riverbank Drainage
The project consists of installing a subsurface gravity drainage system to transport water away from the
failure plane and rebuilding the riverbank using a combination of structural fill and native soil. The
subsurface drainage system consists of a perforated 4-inch schedule 40 polyvinyl chloride (PVC) pipe that
will capture subsurface water along the 165-foot length of the bank repair. Solid 4-inch PVC finger drains
set at approximately 20-foot intervals will convey the water from the perforated pipe to outfalls located
landward of OHWM. Small rock will be installed at the outfalls to protect against erosion. This rock is
designed to withstand flows from the pipe and sheer stress of river flows under anticipated conditions.
This design will reduce the water pressure upgradient of the riverbank and thereby reduce the potential for
future drawdown failures. The project is designed to address the primary cause of bank failure (drawdown)
and does not include design elements to protect against toe erosion or scour.
We anticipate that a qualified contractor will install the drainage system and restore the bank using a
medium-sized track mounted excavator and other support equipment. The project will be completed during
WDFW's allowable in water work window, or approximately August 1- August 31. Construction is estimated
GEOENGINEERS.
File No. 21493-001-01
LD Schneider and Associates June 2015 Page 4
to take approximately 2 weeks. Because the project is located in the 100-foot buffer of the Green River,
TMC 18.44.090 E(4) requires the owner, the specialist of record (GeoEngineers), the contractor
and representatives from the City of Tukwila to attend a preconstruction meeting at the site. Per
TMC 18.44.090 E(5), GeoEngineers will be retained to monitor construction.
We estimate that approximately 420 cubic yards (yd3) of material will be cut and filled to complete the
project. Of this 420 cubic yards of material, approximately 160 cubic yards will be native material that will
remain on site and will be incorporated back into the riverbank. It will be necessary to import additional
material to achieve the design elevations and grades. This material and the estimated quantities are listed
below.
Anticipated Material Schedule
Approximately 420 yd3 of cut and fill:
• Approximately 160 yd3 of native material to remain on site.
■ Approximately 160 yd3 of imported riverbank fill.
■ Approximately 96 yd3 of imported topsoil.
• Approximately 3 yd3 of 1-inch drain rock.
• Approximately 1 yd3 of imported outfall protection.
Stability Analysis of Design
We analyzed the proposed slope repair using the computer program SLOPE/W (GEO-SLOPE International,
Ltd., 2012). The SLOPE/W program evaluates the stability of numerous trial shear surfaces using a vertical
slice limit -equilibrium method (Morgenstern -Price). This method compares the ratio of forces driving slope
movement to the forces resisting slope movement for each trail shear surface, and presents the ratio as
the factor of safety. The program then sorts the trail shear surfaces and identifies the surface with the
lowest factor of safety, or the "critical" shear surface.
We first analyzed the slope in what was likely its configuration just prior to the slough occurring. Our analysis
was based on the subsurface data collected in our explorations and on groundwater conditions consistent
with a drawdown condition. For this condition we calculate that the factor of safety is less than 1.0. This
indicates that the forces driving slope movement exceed the forces resisting slope movement and that the
slope would fail. Additionally, the calculated critical shear surface is similar to the observed shear surface
of the slough. This result further corroborates our opinion that the bank slough was triggered by drawdown.
We then analyzed the slope with the proposed repair in place. In this case we calculate that the factor of
safety against a drawdown type failure is 1.3, indicating that the forces available for resisting slope
movement exceed the forces driving slope movement by about 30 percent. As a point of reference, the
United States Army Corps of Engineers (USACE) recommends a calculated factor of safety greater than
about 1.0 or 1.1 against drawdown failures.
GEOENGINEERS
File No. 21493-001-01
\
LD Schneider and Associates June 18 2015
Page 5
Site Restoration
Following installation of the riverbank drainage, the disturbed areas will be restored and enhanced.
The design goal for the project is to reconstruct the bank at an approximate pre -slough slope angle, or
2.5:1 slope. However, the slope angle of the bank reconstruction will be established to fit within the site
constraints, including avoiding damage to the large sycamore trees atop the bank, limiting disturbance to
the root zone and transitioning into the native banks adjacent to the repair. To accommodate this slope
angle, the existing asphalt trail at the top of the bank may need to be realigned. The alignment of the trail
will be established following restoration of the bank.
Due to the anticipated sheer force during high flow events in the river, we anticipate that the reconstructed
bank will require additional erosion protection. 0ur design includes a biodegradable erosion control fabric
designed to withstand sheer stresses under normal flow conditions. The erosion control fabric will also
stabilize the bank slope from raveling during heavy rain events.
Because the project will be completed landward of OHWM, we do not anticipate temporary or permanent
impacts to the aquatic habitat of the Green River. Temporary impacts will be limited to the blackberry and
English ivy infested bank above OHWM. No trees will be removed as part of the project.
The seven mature sycamores along the top of bank will be protected during construction per the
requirements of the Shoreline Substantial Development permit. Because of the proximity of these mature
trees to the work area it is not practical to protect the trees in the manner required by TMC 18.44.080 B
(10). GeoEngineers recommends that the contractor establish tree protections at the maximum practical
distance from the trunks of the sycamore trees to complete the project.
The work area is currently infested with Himalayan blackberry which will be removed during construction.
The project design includes aggressive revegetation to reestablish root strength and help stabilize
the bank. Native plant species will be densely installed in the areas disturbed by the project. Below is a list
of recommended plants to be installed at the site to reestablish root structure and appropriate
riparian habitat.
Estimated
Quantity
5
9
5
5
25
25
25
25
25
Common Name
Black cottonwood
Western red cedar
Big leaf maple
Pacific dogwood
Vine maple
0ceanspray
Snowberry
Western serviceberry
Red osier dogwood
Scientific Name
Populus balsamifera
Thuja plicata
Acer macrophyllum
Corpus nutalli
Acer circinatum
Holodiscus discolor
Symphoricarpos albus
Amelanchier alnifolia
Corpus sericea
Size Spacing
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
6 - 8 feet in height
24—inch in height
24—inch in height
24—inch in height
24—inch in height
10 feet o.c.
10 feet o.c.
10 feet o.c.
10 feet o.c.
10 feet o.c.
5 feet o.c
5 feet o.c
5 feet o.c
5 feet o.c
File No. 21493-001-01
GEOENGINEERSI17
LD Schneider and Associates June .. ,2015 Page 6
We developed this native plant palette based on our experience with riparian restoration and with guidance
from WDFW (Cramer, 2012). We increase the density of the installed trees to 10 feet on -center at the
request of WDFW (2015). Installed deciduous trees will be 2-inch caliper, conifer will be 6-8 foot height and
shrubs will be 24-inch height in compliance with TMC 18.44.080 C(1)(j). Trees will be planted on 10-foot
spacing per WDFW's request and shrubs will be planted on 5-foot spacing per TMC 18.44.080 C(2)(d).
To enhance aquatic habitat, the GeoEngineers biologist will provide guidance to the contractor in installing
the plants in locations that promote shade and overhanging vegetation near OHWM while maintaining the
view corridors of the existing riverfront trail. Large trees will be installed outside the drip line of the existing
sycamore trees. The planting plan also accounts for the seasonally fluctuating river levels and variable
hydrology up the slope of the riverbank. Because of the typical hot and dry conditions during WDFW's
allowable work window, we recommend that the revegetation of the riverbank be delayed until late fall.
Planting in late summer will likely result in plant failure and poor revegetation. The erosion control fabric
installed on the riverbank will stabilize the bank in the interim between repair of the bank and site
revegetation.
To avoid and minimize water quality impacts during construction, temporary erosion and sediment controls
will be installed prior to site work. A silt fence will be installed on the downslope construction limits, near
OHWM, as the primary water quality protection. Contingency water quality protections include additional
silt fence, silt curtains and straw wattles.
We estimate the cost to construct the bank repair to be approximately $65,000. 0ur Project Value
documentation is included as Appendix C.
Maintenance and Monitoring
We anticipate that the riverbank drainage system will require minimal maintenance. Maintenance will
include occasional flushing of the system via backwashing from the outfalls. The frequency of this
maintenance will be determined on an as needed basis.
The restored vegetation on the bank will be managed by the on -site property management staff. We
anticipate that the riverbank will be maintained as a part of their routine maintenance regimen.
Maintenance will include physical removal of noxious and invasive species that may be detrimental to
the restored riparian habitat along the riverbank. These noxious and invasive species include but are not
limited to:
• Knotweeds (Polygonum spp.)
• Butterfly bush (Buddleja spp.)
• Himalayan blackberry (Rubus armeniacus)
• English ivy (Hedera helix)
• Scotch broom (Cytisus scoparius)
Use of chemical herbicides to control these species is considered unnecessary and is not recommended.
We recommend that the installed plants be watered during the dry season for a minimum of three years
following plant installation. This watering should occur during the late summer and the frequency shall be
determined based on weather conditions and plant performance.
GEOENGINEERZ
File No. 21493-001-01
LD Schneider and Associates
l �
June 18, 2015
Page 7
Beneficial volunteer plants, such as other native species, will be encouraged at the site. Installed plants
that do not survive will be replaced as required by the authorizations from the City of Tukwila and WDFW.
We anticipate that a provision of the permit issued by WDFW will require 80 percent survival of installed
plants for three years following construction of the project. The City of Tukwila will likely require monitoring
of the site for a period of five years following plant installation.
To monitor performance of the restored vegetation and to comply with project permits, a qualified biologist
will annually monitor the site for a period of five years following construction of the project. To track
vegetation performance at the site through the monitoring period, we recommend that the monitoring
biologist establish a transect along the bank. Using the line intercept method, the biologist will inventory
the number and species of native plants observed within 1 foot of either side of the transect shortly
following installation of the plants. The location, orientation and length of this transect will be determined
in the field by the biologist. The endpoints of the transect will be marked in the field. The biologist will return
to the site on an annual basis to complete the survival inventory at the location of the transect. The biologist
will determine annual survival rates which will be used to gauge compliance with WDFW's permit.
Our experience has shown that calculating survival rates is problematic because of the inherent difficulty
of identifying individual plants as the site matures. We recommend that the biologist also measure the
areal cover of beneficial vegetation along the length of the transect. It is our opinion that measuring the
areal cover of native plants is a better indicator of site performance, is more repeatable and results in less
variability amongst site investigators during the monitoring period. Native volunteer plants will be included
in the plant inventory and areal cover measurements for the remainder of the monitoring period.
The biologist will complete monitoring events on an annual basis for five years following plant installation.
The findings of each monitoring event will be documented and the owner will submit annual reports to the
City of Tukwila and WDFW.
NO NET LOSS ANALYSIS AND MITIGATION SEQUENCING
Consistent with the City of Tukwila's Shoreline Master Program (SMP), this project will result in no net loss
of shoreline ecological function. The project will result in approximately 5,000 square feet of temporary
impacts to the shoreline. These impacts are necessary to eliminate the inherent public safety issue posed
by the slope failure and to maintain safe, public access to the shoreline on the property. To rectify these
unavoidable impacts, the project follows the mitigation sequencing steps identified in TMC 18.44.070 H(3).
Because the project is located landward of OHWM, it avoid impacts to the aquatic environment of the
Green River. The riparian habitat that will be impacted by the project is heavily degraded and infested with
noxious and invasive plants species. The project proposes to restore and enhance the riparian habitat by
removing invasive species and installing native trees and shrubs. The owner is committed to maintaining
and monitoring the impacted area to ensure the success of the restoration. As a result of these mitigation
steps, the project results in no net loss of shoreline ecological function.
We estimate that approximately 200 cubic yards of bank material sloughed into the river during a recent
drawdown failure. Much of this material has subsequently been eroded and carried downstream by the
river. The drawdown failure resulted a 9-foot high vertical escarpment that damaged the existing public
access trail. The escarpment poses a safety risk which has resulted in the closure of the trail. To eliminate
this safety hazard, the project will add approximately 160 cubic yards of fill material. This fill material is
intended to replace a portion of the bank lost as a result of drawdown failure. We consider this amount of
fill to be minor and will have no measureable impact to the hydrology, habitat or other shoreline function.
EGEOENGINEERS.....0
File No. 21493-001-01
LD Schneider and Associates June �. , 2015 Page 8
REFERENCES
Cramer, Michelle L. (managing editor). 2012. Stream Habitat Restoration Guidelines. Co -published by the
Washington Departments of Fish and Wildlife, Natural Resources, Transportation and Ecology,
Washington State Recreation and Conservation Office, Puget Sound Partnership, and the U.S. Fish
and Wildlife Service. Olympia, Washington.
WDFW. 2015. Personal Communication between Larry Fisher (WDFW) and Thomas Bannister
(GeoEngineers) on June 9, 2015.
LIMITATIONS
We have prepared this report for LD Schneider and Associates for failing bank along the Green River
adjacent to the property at 14900 Interurban Avenue South in Tukwila, Washington.
Within the limitations of scope, schedule and budget, our services have been executed in accordance with
generally accepted practices in the fields of geotechnical engineering, hydrology, and restoration design
engineering in this area at the time this report was prepared. The conclusions, recommendations and
opinions presented in this report are based on our professional knowledge, judgment and experience. No
warranty, express or implied, applies to our services and this report.
Any electronic form, facsimile or hard copy of the original document (email, text, table and/or figure), if
provided, and any attachments should be considered a copy of the original document. The original
document is stored by GeoEngineers, Inc. and will serve as the official document of record.
Sincerely,
GeoEngineers, Inc.
Thomas A Bannister Lyle J. Stone, PE, GE
Biologist Senior Geotechnical Engineer
Jonathan M. Ambrose
Associate Hydrologist
TAB:US:JMA:Ieh
Attachments:
Appendix A. Geologic Boring Logs
Appendix B. Permit Level Design Drawings
Appendix C. Project Value Documentation
One copy submitted electronically
Disclaimer. Any electronic form, facsimile or hard copy of the original document (email, text, table, and/orfigure), if provided, and any attachments are only a copy
of the original document. The original document is stored by GeoEngineers, Inc. and wal serve as the official document of record.
GEOENGINEERS_
File No. 21493-001-01
APPENDIX A
Geologic Boring Logs
SOIL CLASSIFICATION CHART
Al JITIONAL MATERIAL SYMBOLS
MAJOR DIVISIONSSYMBOLS
TYPICAL
DESCRIPTIONS
GRAPH
LETTER
COARSE
GRAINED
SOILS
MORE THAN 50%
RETAINED ON NO.
200 SIEVE
GRAVEL
AND
GRAVELLY
SOILS
MORE THAN 50%OF
COARSE FRACTION
RETAINED ON NO.4
SIEVE
CLEAN
GRAVELS
(LITHE OR NO FINES)
OU U C
0 o o
) (",�
GW
WELL -GRADED GRAVELS,
GRAVEL -SAND MIXTURES
o 0 0
0 0 c
D 0 o
GP
POORLY -GRADED GRAVELS,
GRAVEL - SAND MIXTURES
GRAVELS WITH
FINES
(APPRECIABLE AMOUNT
OF FINES)
GM
SILTY GRAVELS, GRAVEL -SAND
SILT MIXTURES
111/
o z
GC
CLAYEY CLAYEY GRAVELS, GRAVEL -
SAND - CLAY MIXTURES
SAND
AND
SANDY
SOILS
MORE THAN 50% OF
COARSE FRACTION
PASSING NO. 4
SIEVE
CLEAN SANDS
(LITRE OR NO FINES)
°
sw
GRAVELLLY SANDS DS,
SP
POORLY -GRADED SANDS,
GRAVELLY SAND
SANDS WITH
FINES
(PRECIABANT
FINES)MIXTURES
SM
SILTY SANDS, SAND - SILT
MIXTURES
SC
CLAYEY SANDS, SAND -OF
FINE
GRAINED
SOILS
MORE THAN 50%
PASSING NO. 200
SIEVE
SILTSMEDIUM
AND
CLAYS
LIOUID LIMICL
LESS THAN 50
f
ML
INORGANIC SILTS, ROCK FLOUR,
CLAYEY SILTS WITH SLIGHT
PLASTICITY
INORGANICCLAYSOFLOWTO
PLASTICITY, GRAVELLY
CLAYS, SANDY CLAYS, SILTY
CLAYS, LEAN CLAYS
OL
ORGANIC SILTS AND ORGANIC
SILTY CLAYS OF LOW
PLASTICITY
SILTS
AND
CLAYS
LN]UID LIMIT
GREATER THAN50
)
J
MH
INORGANIC SILTS, MICACEOUS
OR DIATOMACEOUS SILTY SOILS
/
CH
INORGANIC CLAYS OF HIGH
PLASTICITY
I I
~/\
OH
ORGANIC CLAYS AND SILTS OF
MEDIUM TO HIGH PLASTICITY
HIGHLY ORGANIC SOILS
PEAT, HUMUS, SWAMP SOILS
WITH HIGH ORGANIC CONTENTS
= = =
PT
NOTE: Multiple symbols are used to indicate borderline or dual soil classifications
LI
■
11
x
Sampler Symbol Descriptions
2.4-inch I.D. split barrel
Standard Penetration Test (SPT)
Shelby tube
Piston
Direct -Push
Bulk or grab
Continuous Coring
Blowcount is recorded for driven samplers as the number
of blows required to advance sampler 12 inches (or
distance noted). See exploration log for hammer weight
and drop.
A "P" indicates sampler pushed using the weight of the
drill rig.
SYMBOLS
TYPICAL
DESCRIPTIONS
GRAPH
LETTER
AC
Asphalt Concrete
CC
Cement Concrete
CR
Crushed Rock/
Quarry Spalls
TS
Topsoil/
Forest Duff/Sod
°/oF
AL
CA
CP
CS
DS
HA
MC
MD
OC
PM
PI
PP
PPM
SA
TX
UC
VS
NS
SS
MS
HS
NT
Groundwater Contact
Measured groundwater level in
exploration, well, or piezometer
Measured free product in well or
piezometer
Graphic Log Contact
Distinct contact between soil strata or
geologic units
Approximate location of soil strata
change within a geologic soil unit
Material Description Contact
Distinct contact between soil strata or
geologic units
Approximate location of soil strata
change within a geologic soil unit
Laboratory / Field Tests
Percent fines
Atterberg limits
Chemical analysis
Laboratory compaction test
Consolidation test
Direct shear
Hydrometer analysis
Moisture content
Moisture content and dry density
Organic content
Permeability or hydraulic conductivity
Plasticity index
Pocket penetrometer
Parts per million
Sieve analysis
Triaxial compression
Unconfined compression
Vane shear
Sheen Classification
No Visible Sheen
Slight Sheen
Moderate Sheen
Heavy Sheen
Not Tested
NOTE: The reader must refer to the discussion in the report text and the logs of explorations for a proper understanding of subsurface conditions.
Descriptions on the logs apply only at the specific exploration locations and at the time the explorations were made; they are not warranted to be
representative of subsurface conditions at other locations or times.
i
KEY TO EXPLORATION LOGS
GEOENGINEERS!/�
FIGURE A-1
f �
/
Start End
Total ""-'51.5
Depth (ft)
Logged BAW/SST
Checked By LJS
Driller Holocene Drilliny'Inc.
Drilling Hollow Stem Auger
Method
Drilled 4/23/2015 4/23/2015
Surface Elevation (ft) 28
Vertical Datum NAVD88
Hammer Auto Hammer
Data 140 (Ibs) / 30 (in) Drop
Drilling Diedrich D50 Truck Rig
Equipment
Easting (X)
Northing (Y)
System
Datum
Groundwater
Depth to
Date Measured Water (ft) Elevation (ft)
Notes:
See Remarks
II
20 ds Elevation (feet)
o Depth (feet)
l rI
FIELD DATA
Graphic Log
Croup
lass
Classification
Moisture
Content (%)
Interval
Recovered (in)
o
3
p
m
Collected Sample
Sample Name
Testing
Water Level
MATERIAL
DESCRIPTION
L-
y.2
s0
u.0
REMARKS
J 2
12
3
4
2A
ML
Brown silt with sand, occasional organic matter
- (twigs, duff) (soft, moist)
J
118
4
2B
%F
ML
_ Brown silt with sand (medium stiff, moist) -
(alluvium)
21
56
8
3
aA
MC
/
ML
Brown silt, trace sand (soft, moist) (alluvium)
48
- 10--]
-,:0
15
-
_NC)
18
I 18
14
1 18
5
9
10
7
48
SA
6
BA
SM
Gray silty sand (very loose, moist) (alluvium)
Grades to loose, wet
— _
- -
33
36
Groundwater observed at 14 feet at time of
drilling
-
- 20114
h -
3
BB
2
ML
_ Gray silt, trace sand (medium stiff, moist) _
(alluvium)
57
98
25
-J
- 301
-
—y -
351
Note: See
16
12
18
Figure
22
21
25
A-1 for
10
11
12
explanation of symbols.
/
SP-SM
_ Gray fine to coarse sand with silt (medium dense, —
wet) (alluvium)
_
Log of Boring B-1
G EO E N G I N E E RSA,/,
Project:
Project Location:
Project Number:
Green River Bank Design and Permitting
Tukwila, Washington
21493-001-01
Figure A-2
Sheet 1 of 2
:GEOENGINEERS8.GDT/GEIB GEOTECH STANDARD
1-
E
Seattle: Dete:6/17/15 Path:W:\SEATTLE\PROJECTS \21\214
Elevation (feet)
0
40� 12
Z
1
c
Recovered (in)
FIELD DATA
8
N
m
Collected Sample
5)
E
z
Water Level
MATERIAL
DESCRIPTION
C
2
c CI
u. 0
REMARKS
45 A 18
50, 18
22
50
73
13A
13B
14
15
SAND
STONE -
Sandstone: white; visually fresh; fine grained
(Puget Group Tiger Mountain formation)
Note: See Figure A-1 for explanation of symbols.
Log of Boring B-1 (continued)
GEOENGINEERS
Project: Green River Bank Design and Permitting
Project Location: Tukwila, Washington
Project Number: 21493-001-01
Figure A-2
Sheet 2 of 2
/
Start
End
4/23/2015
Total � 36.5
Depth (ft)
Logged BAW/SST
Checked By LJS
�'
Driller Holocene DrillilfiLj Inc.
Drilling g
Method Hollow Stem Auger
Drilled 4/23/2015
Surface Elevation (ft)
Vertical Datum
28
NAVD88
Hammer
Data 140 (Ibs) / 30 (in) Drop
Drilling Diedrich D50 Truck Rig
Equipment
Easting (X)
Northing (Y)
System
Datum
Groundwater
Depth to
Date Measured Water (ft) Elevation (ft)
Notes:
•
See Remarks
o
1 1 i 1 1 i 1 1 1 i I i i 1 1 1 1 1 1 i 1 1 1 1 i I 1 i 1 i 1
Is Is'o vs ?0 s Elevation (feet)
Ul o N o cn o o o Depth (feet)
FIELD DATA
Graphic Log
Group
Classification
Moisture
Content (%)
Interval
Recovered (in)
2
O
Fai.
Collected Sample
Sample Name
Testing
Water Level
MATERIAL
DESCRIPTION
s c
U
REMARKS
12
3
1
"m,
AC
\2 inches asphalt concrete walkway
J
1
6
12
2
6
2
3A
SM
- Brown silty fine to medium sand (very loose,
moist) (alluvium)
1
1 18
1 18
1 18
11 12
18
4
10
10
12
2
38
o
%F
5
6
SA
6A
SM
Brown silty fine to medium sand (loose, moist)
- (alluvium)
-
Grades to wet
-
_ Grades to medium dense with trace organic -
matter (small roots)
_
- _
—
33
33
43
47
Groundwater observed at 12 feet at time of
drilling
I
Da
Mc
ML ML
_ Light gray silt with trace horizontally oriented
organic matter (fine fibrous wood fragments)
- (soft, moist) (alluvium) -
60
12
1 18
23
9
9
10
SP-SM
_ Gray fine to coarse sand with silt (medium dense, _
wet) (alluvium)
- _
— —
26
10
118
37
11
SAND
STONE
Sandstone: white, visually fresh, fine grained
— (Puget Group Tiger Mountain formation)
Driller indicated different drilling conditions at
approximately 34 feet
Note: See Figure A-1 for explanation of symbols.
Log of Boring B-2
GEOENGINEERS,G
Project: Green River Bank Design and Permitting
Project Location: Tukwila, Washington
Project Number: 21493-001-01
Figure A-3
Sheet 1 of 1
21943-001-00 SST:LJS 04-28-2015
t-V 3ZIf10IA
Sl1fS321 SISAWNV 3AGIS
PERCENT PASSING BY WEIGHT
100
90
80
70
60
50
40
30
20
10
0
U.S. STANDARD SIEVE SIZE
3" 1.5" 3/4" 3/8" #4 #10 #20 #40 #60 #100 #200
1000
100
0
10
0
1
GRAIN SIZE IN MILLIMETERS
01
0.01
0.001
BOULDERS
COBBLES
GRAVEL
SAND
COARSE
FINE
COARSE
MEDIUM
FINE
SILT OR CLAY
SYMBOL
EXPLORATION
NUMBER
DEPTH
(ft)
USCS SOIL CLASSIFICATION
0
B-2
B-1
17.5
10
Gray silty sand (SM)
Brown silty sand (SM)
■
APPENDIX B
Permit Level Design Drawings
0
OD
TAB:COVER S
01\00\CAD \214930
hi
5133rd 5t
Qa
Jr
3Q
rh
FOSTER r 4
J
r37Sh St
t Camp
0
5 140th Sty 140th St
U
Showalter Middle
School
foster Nigh School
S 144th St
5t
5 160th St
S 146th St
f.
0
5 150th St
Sou
S 156th St
5 164th 5t
5 166th St
116
La
5 139th St
0
0
•
Crystal Springs
Park
'1
yb
D
S 144th St
S 150th St
3D o�
rh.or o°C'
5P
Ro'S
Foster Gott Links
5 147th 5t
L 4
� M
5 152nd St
rL,
LD SCHNIEDER
GREEN RIVER BANK REPAIR
TUKWILA, WASHINGTON
BLACK RIVER
5143rd Sr JUNCTION
S 143rd PI
5 130th St
S Langston Rd S Langston Rd
5 132nd St 5j32nd St
S 133rd 5t
81ark River Quarry
PROJECT
SITE
ion Dent Park
149th S x
•
r
'"S
S 153rd St
Tukwila Park
UICWIla
wy Tukwil
e.
e c
Southrenter Mall
D
VICINITY MAP
SCALE: 1 "=100'
65
O p
ze
Baker Blvd
Strander Blvd
Treck Dr
GRAPHIC SCALE
1000
0 1000
FEET
5
<
p
n
is
S 132nd St S 132n
5 134th St
5 135th St
Blwk River Riparun
Forest and Wetland
0
r
n Tukwt5
v-
SW 16th St
SW 27th,r
0
D
0
SHEET INDEX:
1 VICINITY MAP AND SITE MAP
2 NOTES AND SPECIFICATIONS
3 SITE PLAN
4 CROSS —SECTIONS
5 DETAILS
SITE MAP
SCALE: 1 "=400'
GRAPHIC SCALE
400 0 400
FEET
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
RE
Description
Date By Chk
Rev
DESIGNED LJS
DRAWN
TJM
DATE 05/27/15 I FILE NO. 21493-001-01
SCALE AS NOTED IREVISED. 00/00/00
CHECKED JMA__._.
Pus�° GEOENGINEERS
45765
ST0,t,1 L E.
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
VICINITY MAP AND SITE MAP
SHEET
1
ES AND DETAILS MODIFIED BY "MICHAUD ON JUN II, 2015 - 9:04
GENERAL NOTES:
1. THESE DESIGNS AND DRAWINGS HAVE BEEN PREPARED FOR THE EXCLUSIVE USE OF LD SCNEIDER, AND
THEIR AUTHORIZED AGENTS. NO OTHER PARTY CAN RELY ON THE PRODUCT OF OUR SERVICES UNLESS
GEOENGINEERS INC. (GEOENGINEERS) AGREES IN WRITING IN ADVANCE OF SUCH USE.
2. THE DRAWINGS CONTAINED WITHIN SHOULD NOT BE APPLIED FOR ANY PURPOSE OR PROJECT EXCEPT
THE ONE SPECIFIED.
3. THESE DESIGNS AND DRAWINGS ARE COPYRIGHTED BY GEOENGINEERS, INC. ANY USE, ALTERATION,
DELETION, OR EDITING OF THIS DOCUMENT WITHOUT EXPLICIT WRITTEN PERMISSION FROM GEOENGINEERS
IS STRICTLY PROHIBITED. ANY OTHER UNAUTHORIZED USE OF THIS DOCUMENT IS PROHIBITED.
4. THE CONTRACTOR SHALL CONSTRUCT THE PROJECT IN ACCORDANCE WITH THE PLANS STAMPED
"APPROVED FOR CONSTRUCTION." THESE PLANS WILL BE PROVIDED TO THE CONTRACTOR BY THE
ENGINEER OR PROJECT INSPECTOR PRIOR TO CONSTRUCTION. WORK SHALL NOT BE INITIATED WITHOUT
THE PLANS APPROVED FOR CONSTRUCTION.
5. THE DESIGNS DEPICTED HEREIN ARE APPROXIMATE AND ARE INTENDED TO EXPRESS THE OVERALL DESIGN
INTENT OF THE PROJECT. THESE DESIGNS MAY NEED TO BE ADJUSTED IN THE FIELD DURING
CONSTRUCTION IN ORDER TO MEET THE SPECIFIC SITE CONDITIONS AND INTENDED FUNCTION. THESE
RIVER IMPROVEMENTS HAVE BEEN DEVELOPED WITH THE UNDERSTANDING THAT A QUALIFIED
GEOENGINEERS ENGINEER AND/OR SCIENTIST BE ON -SITE TO PROVIDE CONSTRUCTION GUIDANCE WHILE
THE PROJECT IS CONSTRUCTED.
6. CONDITIONS CAN CHANGE AND THESE DESIGNS ARE BASED ON CONDITIONS THAT EXISTED AT THE TIME
THE DESIGN WAS PERFORMED. THE RESULTS OF THESE DESIGNS MAY BE AFFECTED BY THE PASSAGE
OF TIME, BY MANMADE EVENTS SUCH AS CONSTRUCTION ON OR ADJACENT TO THE SITE, OR BY NATURAL
EVENTS SUCH AS FLOODS, EARTHQUAKES, SLOPE INSTABILITY OR GROUNDWATER FLUCTUATIONS. ALWAYS
CONTACT GEOENGINEERS BEFORE APPLYING THESE DESIGNS TO DETERMINE IF THEY REMAIN APPLICABLE.
7. THESE PLANS AND ELECTRONIC DRAWINGS ARE BASED ON WASHINGTON STATE PLANE NORTH
COORDINATES US FEET AND A NORTH AMERICAN VERTICAL DATUM OF 1988 US FEET. ELEVATIONS AND
NORTHINGS AND EASTINGS WITHIN THIS PLANSET ARE BASED ON THESE DATUMS.
CONSTRUCTION NOTES:
1. CONTRACTORS WORKING WITHIN THE PROJECT BOUNDARIES ARE RESPONSIBLE FOR COMPLIANCE WITH ALL
APPLICABLE SAFELY LAWS. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL BARRICADES, SAFETY
DEVICES AND CONTROL OF TRAFFIC WITHIN AND AROUND THE CONSTRUCTION AREA.
2. MATERIAL AND WORKMANSHIP FURNISHED ON OR FOR THE PROJECT MUST MEET THE MINIMUM
REQUIREMENTS OF PROJECT PERMITS, APPROVING AGENCIES, SPECIFICATIONS AS SET FORTH HEREIN, OR
WHICHEVER IS MORE RESTRICTIVE.
3. THE CONTRACTOR SHALL INSTAI I. AND MAINTAIN APPROPRIATE SEDIMENT CONTROL DEVICES THROUGHOUT
THE WHOLE PROJECT SITE, INCLUDING THE CONSTRUCTION STAGING AREA AND STOCKPILE AREA
THROUGHOUT THE PROJECT'S CONSTRUCTION. TEMPORARY CONSTRUCTION AND PERMANENT EROSION
CONTROL MEASURES SHALL BE DESIGNED, CONSTRUCTED AND MAINTAINED IN ACCORDANCE WITH
APPLICABLE LOCAL, STATE AND FEDERAL REGULATIONS.
4. CONSTRUCTION SHALL OCCUR DURING THE APPROVED WDFW FISH WINDOW FOR THE PROJECT AREA.
5. DISCHARGES ENTERING ACTIVE STREAMS ON -SITE SHALL SATISFY ALL STATE AND FEDERAL STANDARDS
AND PROJECT PERMIT REQUIREMENTS FOR CONTAMINANTS AND TURBIDITY.
SPECIFICATIONS:
A. REFERENCED SPECIFICATIONS ARE FROM THE 2014 VERSION OF THE WSDOT STANDARD SPECIFICATIONS
FOR ROAD, BRIDGE, AND MUNICIPAL CONSTRUCTION.
MATERIALS:
A. RIVERBANK FILL
1. RIVERBANK FILL SHALL CONSIST OF WELL GRADED SAND AND GRAVEL CONFORMING TO EITHER WSDOT
STANDARD SPECIFICATION 9-03.10 "AGGREGATE FOR GRAVEL BASE", 9-03.12(2) "GRAVEL BACKFILL FOR
WALLS", 9-03.13(1) "GRAVEL BORROW", 9-03.13(2) "SELECT BORROW", OR OTHER MATERIALS AS
APPROVED BY THE GEOTECHNICAL ENGINEER. NATIVE ALLUVIUM FROM THE EXISTING RIVERBANK MAY BE
INCORPORATED INTO THE RIVERBANK FILL PROVIDED THAT THE ALLUVIUM CONTAINS LESS THAN 30
PERCENT FINES (MATERIAL PASSING THE NO. 200 SIEVE) BY WEIGHT OR AS APPROVED BY THE
GEOTECHNICAL ENGINEER.
2. RIVERBANK FILL SHALL BE FREE OF ORGANICS OR OTHER DELETERIOUS MATERIALS.
B. DRAINAGE ROCK
1. DRAINAGE ROCK SHALL MEET WSDOT STANDARD SPECIFICATION 9-03.12(2) "GRAVEL BACKFILL FOR
WALLS."
C. DRAIN PIPE
1. DRAIN PIPE SHALL CONSIST OF 4-INCH SCHEDULE 40 PVC PIPE. THE PIPE SHALL BE SOLID OR
PERFORATED AS INDICATED ON THE PROJECT PLANS. THE PIPE AND CONNECTIONS SHALL MEET AASHTO
SPECIFICATION M 278. PIPE CONNECTIONS AND DETAILING SHALL BE IN ACCORDANCE WITH THE
MANUFACTURER'S RECOMMENDATIONS.
2. PERFORATED DRAIN PIPE INSTALLED PARALLEL TO THE SLOPE AND SHALL CONNECT TO SOLID DRAIN
D.
1.
PIPES (OUTLET DRAINS) THAT DAYLIGHT TO THE SLOPE FACE. SOLID DRAIN PIPES SHALL BE SPACED NO
MORE THAN 20 FEET APART. SOLID DRAIN PIPES SHALL DISCHARGE ON AN EROSION PROTECTION PAD
OR EXTEND TO THE BASE OF THE EXISTING SLOPE. EROSION PROTECTION PADS SHALL BE
CONSTRUCTED OF MATERIAL CONFORMING TO WSDOT STANDARD SPECIFICATION 9-03.9(2) "PERMEABLE
BALLAST'. THE EROSION PROTECTION PADS SHALL BE FIELD FIT BY THE ENGINEER AT THE DISCHARGE
LOCATIONS AND SHALL HAVE A MINIMUM THICKNESS OF 6-INCHES, MINIMUM LENGTH (PARALLEL TO
SLOPE) OF 2 FEET, AND MINIMUM WIDTH (PERPENDICULAR TO SLOPE) OF 1 FOOT.
NON -WOVEN GEO-TEXTILE
NON -WOVEN GEO-TEXTILE SHALL MEET WSDOT STANDARD SPECIFICATION 9-33.1 "GEOSYNTHETIC
MATERIAL REQUIREMENTS" FOR NON -WOVEN GEO-TEXTILES USED FOR SEPARATION.
E. RECYCLED MATERIAL
1. RECYCLED MATERIAL SHALL NOT BE USED IN AGGREGATES OR FILL.
F.
1.
TOPSOIL
TOPSOIL SHALL CONSIST OF A COMMERCIALLY AVAILABLE 3-WAY MIXTURE CONSISTING OF LOAM SOIL,
ORGANICS AND COMPOST PASSING 34-INCH SIEVE.
G. EROSION CONTROL BLANKET
1.EROSION CONTROL BLANKET SHALL COMPLY WITH WSDOT STANDARD SPECIFICATION 9-14.5(2)D
"BIODEGRADABLE EROSION CONTROL BLANKET FOR DITCHES. THE EROSION CONTROL BLANKET SHALL BE
100-PERCENT BIODEGRADABLE INCLUDING THE MESH BACKING.
EXECUTION:
A. SUBGRADE PREPARATION
1. SUBGRADES SHALL BE CLEARED AND GRUBBED. REMOVE BRUSH, SOD, OR OTHER ORGANIC OR
DELETERIOUS MATERIALS PRIOR TO THE PLACEMENT OF FILL. SOFT AREAS SHALL BE OVEREXCAVATED
AND REPLACED, AS DIRECTED BY GEOTECHNICAL ENGINEER.
2. SUBGRADE SHALL BE APPROVED BY GEOTECHNICAL ENGINEER. SUBGRADE SOILS SHALL BE COMPACTED
TO A FIRM AND UNYIELDING CONDITION BEFORE CONSTRUCTION PROCEEDS. SUBGRADE MATERIALS NOT
MEETING GEOTECHNICAL ENGINEER'S APPROVAL SHALL BE REMOVED AND REPLACED WITH RIVERBANK FILL
AT DIRECTION OF GEOTECHNICAL ENGINEER.
3. OVEREXCAVATED AREAS SHALL BE REPLACED WITH COMPACTED RIVERBANK FILL MATERIAL.
B. SLOPE PREPARATION
1. EXISTING SLOPES SHALL BE RE -GRADED AS REQUIRED TO INSTALL SPECIFIED IMPROVEMENT AND TO
MAINTAIN A SAFE WORK ZONE. THE CONTRACTOR IS RESPONSIBLE FOR MAINTAINING A SAFE WORK ZONE
AND COMPLYING WITH THE PROVISIONS OF TITLE 296 WASHINGTON ADMINISTRATIVE CODE (WAC), PART N,
"EXCAVATION, TRENCHING AND SHORING."
2. FILL PLACED ON OR ADJACENT TO SLOPES SHALL BE PLACED ON HORIZONTAL BENCHES CUT INTO THE
EXISTING SLOPE.
3. BENCHES SHALL EXTEND A MINIMUM OF 2-FEET HORIZONTALLY INTO THE SLOPE AND MAY BE CUT IN
STAGES AS THE FILL PROGRESSES.
C. FILL PLACEMENT AND COMPACTION
1. FILL MATERIAL SHALL BE PLACED IN LOOSE LIFTS NOT EXCEEDING 12-INCHES AND COMPACTED USING
EQUIPMENT DESIGNED FOR SOIL COMPACTION.
2. FILL SHALL BE UNIFORMLY COMPACTED TO A MINIMUM 90 PERCENT OF MAXIMUM DRY DENSITY (MDD) AS
DETERMINED BY ASTM D-1557.
D. SITE REVEGETATION
1. TOPSOIL SHALL BE LOOSELY PLACED ABOVE THE RIVERBANK FILL TO A DEPTH OF 12 INCHES. THE
FINISH GRADE SHALL BE TAMPED FIRM AND PROTECTED FROM EROSION.
2. THE EROSION CONTROL BLANKET SHALL BE SHINGLED OR PLACED IN A MANNER SUCH THAT RIVER
FLOWS AND WIND DO NOT PEEL UP THE FABRIC. THE EROSION CONTROL FABRIC SHALL BE ANCHORED
FOLLOWING THE MANUFACTURER'S INSTRUCTION.
3. NATIVE PLANTS, IDENTIFIED IN THE PLANT SCHEDULE, SHALL BE INSTALLED FOLLOWING THE LAYOUT
PROVIDED BY THE GEOENGINEERS BIOLOGIST. PLANTS SHALL BE INSTALLED THROUGH THE EROSION
CONTROL FABRIC BY CUTTING THE FABRIC TO THE MINIMUM NECESSARY TO INSTALL THE PLANTS.
E. SITE MAINTENANCE AND MONITORING
1. THE SITE WILL BE MAINTAINED BY THE OWNER INTO PERPETUITY AND IN COMPLIANCE WITH THE
PROJECT PERMITS.
2. THE SITE WILL BE MONITORED FOR A PERIOD OF FIVE YEARS FOLLOWING PLANT INSTALLATION AS
SPECIFIED IN THE DESIGN AND ANALYSIS REPORT BY GEOENGINEERS OR AS REQUIRED BY THE PROJECT
PERMITS.
ANTICIPATED MATERIAL SCHEDULE
APPROXIMATELY 420 YD3 OF CUT AND FILL:
• -160 YD3 OF NATIVE MATERIAL TO REMAIN ON SITE.
• -160 YD3 OF IMPORTED RIVERBANK FILL.
• YD3 OF IMPORTED TOPSOIL.
• '-3 YD3 OF 1-INCH DRAIN ROCK.
• -1 YD3 OF IMPORTED OUTFALL PROTECTION.
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
Description
Dote By Chk Rev
DESIGNED LJS
DRAWN TJM
CHECKED JMA
DATE 05127/15
FILE NO. 21493-001-01
SCALE AS NOTED
REVISED: 00100(00
• '. 0SE P/y
vW4S To'.
A
GEOENGINEERS
503 Stewart Street, SJite 1100 F. 2"6-728-2674
Seattle, WA 98101 F: 206 728- ,32
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
NOTES AND SPECIFICATIONS
SHEET
2
/
OHWM
°HWM
ASPHALT
TRAIL
100' WIDE TYPOS RIVER BUFFER &
URBAN CONSERVANCY BUFFER
\\\
&1-
\\
COMMERCIAL BUILDING
OHWM
LEGEND
BORING LOCATIONS"
EXISTING CONTOURS
PROPOSED BANK LINES
ORDINARY HIGH WATER MARK
LIMITS OF WORK
SILT FENCE
\\\
BORING LOGS PROVIDED IN ACCOMPANYING REPORT (GEOENGINEERS 2015)
VERTICAL DATUM. NAVD88
STONE BENCH
OHWM
B-1
GREEN RIVER
OH WM
EL=10.0'
OHWM
OHWM
CC
v~i
OHWM
STONE BENCH
34" SYCAMORE
PLAN VIEW
SCALE: 1 "=10'
24" SYCAMORE
SCALE
10 0 10
FEET
OUTLET DRAIN
(TYP.)
OHWM
LIMITS OF WORK
24" SYCAMORE
BOTTOM OF FILL SLOPE r SILT FENCE
OHWM
30" SYCAMORE
ARK\N� LOT
�� OHWM
X �
30" SYCAMORE
OHWM
0
24" SYCAMORE
ti� OHWM
con,
TOP OF
EXISTING SLOPE
41" SYCAMORE
PROTECT TREES PER
CITY REQUIREMENTS
(TYP-)
0149
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV
Description Dote By Chk Rev
4-
DESIGNED _LLS _
DATE OS z7115
DRAWN TJM
SCALE AS NOTED
CHECKED JMA
FILE NO. 21493-001-01
REVISED: 00100100
',OSF.PH
avY. -�F
Vlly 1. t1�.
q'c
wS/O.VAL F.l,
GEOENGINEERS
6C0 Stewart Street, SJite 1700 F: 236-728-2674
Seattle, 'NA 28101 F. 21:6-728-7'NA 28101 11 216- %28-T3?
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
SITE PLAN
SHEET
3
i
\
24" SYCAMORE
(PROTECT TREE PER
CITY REQUIREMENT)
30
20 —
10
PARKING LOT
Iz— LANDWARD LIMITS OR WORK
1 EXISTING
ASPHALT
TRAIL
- -
-------------
TOP SOIL EXISTING GRADE
RIVERBANK FILL
EROSION CONTROL FABRIC
N
SEE ANCHOR TRENCH DETAIL
CUT AS REQUIRED FOR SAFETY AND STABILITY
2%
SEE DRAIN DETAIL --' OUTLET DRAIN —
SEE ANCHOR TRENCH DETAIL
OUTFALL PROTECTION PER
MATERIAL NOTE C-2
- 30
BASE FLOOD ELEVATION
SILT FENCE
(WATERWARD LIMITS
OF WORK)
OHWM
20
10
0 1 1 1 1 1 1 1 1 0
0
10 20
30" SYCAMORE
(PROTECT TREE PER
CITY REQUIREMENT)
30 —
20 —
10 —
PARKING LOT
SECTION
30 40
Distance (Feet)
50
60
A
HORIZONTAL SCALE 1"=5'
VERTICAL SCALE: 1 "=5'
LANDWARD
EXISTING
ASPHALT
TRAIL
SEE ANCHOR TRENCH DETAIL
LIMITS OR WORK
CUT AS REQUIRED FOR SAFETY AND STABILITY
SEE DRAIN DETAIL
2.5
-11
C-2
EXISTING GRADE
TOP SOIL
2%
70
80 85
RIVERBANK FILL -
EROSION CONTROL FABRIC -
BASE FLOOD ELEVATION
• — — • — • — - — • — — - 20
SEE ANCHOR TRENCH DETAIL
30
OUTFALL PROTECTION PER
MATERIAL NOTE C-2
SILT FENCE
(WATERWARD LIMITS _
OF WORK)
OHWM
0 20
SCALE SECTION
0 5
FEET
30
40
Distance (Feet)
50
B
HORIZONTAL SCALE: 1"=5'
VERTICAL SCALE: 1"=5'
C-2
60
70
10
0
80
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV Description
t
Date i By Chk
Rev
__4
DESIGNED LJS
DRAWN __TJM
CHECKED JMA
_ DATE 00127115 _ FILE NO. 21493-001-01
SCALE _AS -NOTED_ _ REVISED. 00/00100
.Sp3Py
of wa;\Aos
\4 45765 0, ,�
70NAL
GEOENGINEER_
6�J Stewart Street. SJite 1777 206-728-2674
Seattle. WA 9810' L,6-'29-T73i
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
CROSS -SECTIONS AND DRAIN DETAIL
SHEET
C-3
N
AUD ON JUN II, 2015 - 9:0B
P:\21\21493001\00\CAD\21493001-01 DESIGN SHE
4" SCH40 PERFORATED
PVC DRAIN PIPE
EL. 15.0'
RIVERBANK FILL
12"
DRAIN DETAIL
NON —WOVEN GEOTEXTILE
SOLID SCH40 PVC
OUTLET DRAIN
2%
NATIVE SOIL
NOT TO SCALE
Recommended Planting Schedule
Estimated Common Name Scientific Name Size Spacing
Quantity
5 Black cottonwood Populus balsamifera 6 - 8 feet in height 10 feet o.c.
9 Western red cedar Thuja plicata 6 - 8 feet in height 10 feet o.c.
5 Big leaf maple Acer macrophyllum 6 - 8 feet in height 10 feet o.c.
5 Pacific dogwood Corpus nutalli 6 - 8 feet in height 10 feet o.c.
25 Vine maple Acer circinatum 6 - 8 feet in height 10 feet o.c.
25 Oceanspray Holodiscus discolor 24-inch in height 5 feet o.c
25 Snowberry Symphoricarpos albus 24-inch in height 5 feet o.c
25 Western serviceberry Amelanchier alnifolia 24-inch in height 5 feet o.c
25 Red osier dogwood Corpus sericea 24-inch in height 5 feet o.c
JOINTS IN FILTER FABRIC SHALL BE SPLICED
AT POSTS. USE STAPLES, WIRE RINGS, OR
EQUIVALENT TO ATTACH FABRIC TO POSTS.
II
b~
41,111 I I 7II'7II IIIE�I/
6' MAX. MINIMUM 4"x4" TRENCH %
2"x2" BY 14 Ga. WIRE OR
EQUIVALENT, IF STANDARD
STRENGTH FABRIC USED
FILTER FABRIC
POST SPACING MAY BE INCREASED
TO 8' IF WIRE BACKING IS USED
NOTE: FILTER FABRIC FENCES SHALL BE
INSTALLED ALONG CONTOUR WHENEVER POSSIBLE
BACKFILL TRENCH WITH
NATIVE SOIL OR 3/4"-1.5"
WASHED GRAVEL
\ 2"x4" WOOD POSTS, STEEL FENCE
POSTS, REBAR, OR EQUIVALENT
SILT FENCE DETAIL
NOT TO SCALE
v
Xer
W
2X ROOT
BALL WIDTH
EROSION CONTROL FABRIC
LOOSEN AND/OR CUT CIRCLING ROOTS
IN ROOT BOUND CONTAINERS BEFORE
PLANTING
BREAK UP SIDES AND BOTTOMS
OF PLANTING PIT TO ALLOW
FOR ROOT PENETRATION
COMPACT SUBGRADE
BELOW ROOT BALL
PLANT SCHEDULE TYPICAL PLANTING DETAIL
FOR PERMIT REVIEW -
NOT FOR CONSTRUCTION
REV Description
Date By Chk Rev
DESIGNED LJS _
I
DRAWN
TJM _
CHECKED JMA
DATE 05/27/15 FILE N0. 21493=001-01
SCALE AS NOTEDREVISED. 00 OQ/00
GEOENGINEER_
600 Stewart Street. Suite 1700 n: 2C5-728-2674
Seat0e, WA 9810' 206-728-2732
LD SCHNIEDER- GREEN RIVER BANK REPAIR
14900 INTERURBAN AVENUE
TUKWILA, WASHINGTON
DETAILS
SHEET
5
APPENDIX C
Project Value Documentation
LB Schneider Green River Bank Repair - Project Value Documentation
14900 Interurban Avenue South
Tukwila, Washington
Description
Description of Quantity
QTY per
foot of
repair
Unit
Unit Cost
(Total +
O&P)
Total for
Foot of
Repair
Project Total
Based on 160
Feet of Repair
Excavation and Haul
Riverbank Excavation Including Haul & Disposal
Bid Tab 1060 From B&D Levee Project 0
CY
$17.00
$0.00
$0.00
Subtotal
Subsurface Drainage
Fabric Laid in Trench
RS Means
1.3
SY
$2.42
$3.15
$503.36
Drainage Material
RS Means
0.22
CY
$34.00
$7.48
$1,196.80
6-in PVC Perforated
RS Means
2
LF
$14.45
$28.90
$4,624.00
Rock for Erosion & Scour Protection (Class A)
Bid Tab 1326 B&D Levee
0.126
TON
$48.00
$6.05
$967.68
Subtotal
$42.43
$6,788.48
Foundation Preparation
Foundation Excavation Including Haul & Disposal
Bid Tab 1060 From B&D Levee Project
0
CY
$17.00
$0.00
$0.00
Rock for Erosion & Scour Protection (Class A)
Bid Tab 1326 B&D Levee
0
TON
$48.00
$0.00
$0.00
Subtotal
$0.00
$0.00
Fill Placement and Compaction
Gravel Borrow Including Haul and Compaction
Bid Tab 1075 from B&D Levee Project
5.53
TON
$20.00
$110.60
$17,696.00
Geo-Grid Soil Reinforcement
RS Means
0
SF
$0.81
$0.00
$0.00
Jute Mesh
Bid Tab 8025 from B&D Levee Project
0
SY
$1.30
$0.00
$0.00
Subtotal
$110.60
$17,696.00
Erosion Control, Surface Treatments, and Plantings
TESC
Bid Tab Schedule VII B&D Levee
1
LF of River
$51.28
$51.28
$8,204.80
Landscaping
Bid Tab Schedule VIII B&D Levee
1
LF of River
$100.00
$100.00
$16,000.00
Subtotal
$151.28
$24,204.80
Mobilization, Contingency, Misc., and Totals
Total Unit Costs
$262
$41,901
Mobilization
Assumed Values
10.0%
LS
$26
$4,190
Contingency
Assumed Values
15.0%
LS
$39
$6,285
Miscellaneous Costs
Assumed Values
10.0%
LS
$26
$4,190
Sales Tax
Washington State
9.5%
LS
$25
$3,981
Estimated Totals
$378
$60,547
1 1 f
Chi OF TUKWILA
Department of Community Development
6300 Southcenter Boulevard, Tukwila, WA 98188
Telephone: (206) 431-3670
SHORELINE
SUBSTANTIAL
DEVELOPMENT
PERMIT
INFORMATION
State Shoreline requirements are implemented through the Shoreline Overlay District in the Tukwila Zoning
Code (Tukwila Municipal Code (TMC) 18.44). Tukwila's shoreline regulations were updated in October, 2011
when the Department of Ecology approved the City's new Shoreline Master Program (SMP).
REQUIREMENTS: All development over $6,416 land within 200 ft. of the Duwamish/Green River and
associated wetlands require a "Shoreline Substantial Development Permit" except the following:
• Owner -occupied construction of a single family house that does not exceed 35 feet
in height and/or dock construction when the dock construction costs are less than
$2,500 in salt water and $10,000 in fresh water;
• Normal maintenance and repair;
• Habitat improvements which are part of a watershed plan;
• Hazardous waste remediation when approved by the State;
• Emergency construction needed to protect property from imminent danger.
While a project may be exempt from the need to obtain a Shoreline Substantial Development Permit, the project
must still be consistent with the requirements of Tukwila's SMP. The Director may impose conditions on the
approval of exempt developments and/or uses as necessary to assure compliance of the project with the Shoreline
Management Act and the City's SMP.
PROCEDURES: Your application must contain all of the items listed on the attached "Complete Application
Checklist" including Project Value Documentation. You may request a waiver from items on the checklist that
are not applicable to your project. Please discuss this waiver request with City planning staff prior to submitting
the application.
Within 28 days of receiving your application, City staff will determine if it is complete based on the attached
checklist. If the application is not complete, City staff will contact you about what additional information is
needed. If you do not submit the requested materials within 90 days from the City's request for additional
information, the City may cancel your application.
A shoreline permit decision is made administratively by the Director of the Department of Community
Development after the expiration of the public notice period. The City's decision is sent to the Department of
Ecology for its review. There is a 21 day appeal period on Shoreline Substantial Development Permits and no
construction may occur during that time, although building permits may be reviewed.
EXPIRATION: Construction must begin within two years of permit approval and be completed within five
years.
' Starting in 2007, the dollar threshold trigger for substantial development is adjusted every 5 years, to reflect increases in the
Consumer Price Index.
CPL Page 1 of 10 07/17/2014 10:16 AM
W:\\Long Range Projects\Shoreline\New Shoreline Permits\4-11-12 SSDP Permit
COMPLE APPLICATION ECKLIST
The materials listed below must be submitted with your application unless specifically waived in writing by the
Public Works Department and the Department of Community Development. Please contact each Department if
you feel that certain items are not applicable to your project and should be waived. Application review will not
begin until it is determined to be complete. ADDITIONAL MATERIALS MAY BE REQUIRED.
The initial application materials, once deemed complete, allow project review to begin and vest the applicant's
rights. However, the City may require additional information as needed to establish consistency with
development standards.
City staff are available to answer questions about application materials at 206-431-3670 (Department of
Community Development) and 206-433-0179 (Department of Public Works).
Check items
submitted
with
application
Information Required.
May be waived in unusual cases, upon approval of both Public Works and Planning.
APPLICATION MATERIALS:
11
1. Application Checklist (1 copy) indicating items submitted with application.
1
2. Completed Application Form (page 7) and notarized Hold Harmless Agreement (page 9) (5
copies).
3. Application Fee: See Land Use Fee Schedule for Standard App fee.
"11
4. Project value Documentation. See GeoEngineers Report Appendix C
5. Public Notice Materials and fee. See item A (page 4) for details.
�/
6. Project Description/Analysis (5 copies) and other environmental reports (2copies). See item B
(page 4) for details.
7. Drawings (5 copies) Additional copies may be required upon determination that the application
is complete:
a). Site Plan See item C (page 4) for details.
b). Site Cross Sections along the shoreline . See item D (page 5) for details.
c). Landscape Plans. See item E (page 5) for details.
d). Civil Plans. See item F (page 5) for details.
e). Other plans to help explain the project such as elevations, lighting plan, signage etc. See item
G (page 6) for details.
8. One set of all plans reduced to 8 1/2" by 11" or 11" by 17".
9. An electronic copy of all project application materials.
10. Other land use applications, as applicable: SEPA Environmental Checklist, Design Review
Application (see TMC 18.44.110 for review criteria), Special Permission, Director, for buffer
reduction requests.
A. PUBLIC NOTICE MATERIALS:
1. Payment of notice board fee (see Land Use Fee schedule) to Fast Signs Tukwila or
Provide a 4' x 4' public notice board on site within 14 days of the Department determining that a
complete application has been received (see Public Notice Sign Specifications Handout).
2. Pay the fee as established by the Land Use Fee Schedule for generating mailing labels; Or provide
CPL Page 2 of 10
W:\\Long Range Projects\Shoreline\New Shoreline Permits\4-11-12 SSDP Permit
07/17/2014 10:16 AM
/ \
l \
Check items
submitted
with
application
Information Required.
May be waived in unusual cases, upon approval of both Public Works and Planning.
an excel spreadsheet of mailing labels for all property owners and tenants (residents and businesses)
within 500 feet of the subject property. Each unit in multiple family buildings e.g. apartments,
condos, trailer parks --must be included.
Once your project is assigned to a planner, you will be required to provide an electronic copy of
the mailing label spreadsheet in the following format: Name, Street Address, City St Zip, with each
of these fields as an individual column:
Name
Street Address
City, St, Zip
Mr. Smith
1234 Park Ave S
Tukwila WA 98188
PLEASE NOTE: Regardless of whether you pay the City to generate the mailing labels or you
provide them, there is an additional fee for postage and material as listed under Public Notice
Mailing Fee on the Land Use Fee Schedule. You will receive a separate bill for this fee and payment
is due prior to issuance of the decision.
3. If providing your own labels, include King County Assessor's map(s) which highlights each
property within 500 feet of the project, and are included on the mailing list.
B. PROJECT DESCRIPTION/ANALYSIS AND OTHER ENVIRONMENTAL REPORTS:
1. Vicinity Map with site location - does not have to be to scale.
2. Provide:
a) a written discussion of project consistency with the Review Guidelines(see page 11), or a
reference on plan sheets illustrating compliance with the Review Guidelines; and
b) a response to the No Net Loss Checklist (see pages 13-14).
Check with a planner if you are unsure what criteria apply to your project.
3. Provide two copies of sensitive area studies if needed per TMC 18.44.090 D (Environmentally
Sensitive Areas within the shoreline jurisdiction section of the SMP).
4. Provide an analysis of river bank stability if alteration of the riverbank is proposed. See TMC
18.06.696 for the definition of a riverbank analysis and report.
5. Provide two copies of any other studies prepared for the project (Biological Assessment etc.).
C. SHORELINE SITE PLAN:
1. The site plan must include a graphic scale, north arrow and project name. Maximum size 24" x
36".
2. Identify existing top of bank, landward and riverward toe of levee (or toe of bank if no levee),
ordinary high water mark and base flood elevation (i.e., the 100 year flood).
3. For work riverward of the OHWM: Distance work extends into the river and distance to Federal
projects and navigation channels.
4. Identify the location of the shoreline buffer (measured from the Ordinary High Water Mark)
applicable to the shoreline environment in which the project is located:
• Shoreline Residential Buffer - show where the top of the river bank would be at a 2.5:1 slope
from OHWM and add twenty feet. If there is not enough room on the parcel for this buffer,
the minimum buffer width is 50 ft.;
• Urban Conservancy Buffer —100 ft. non -levee area; 125 ft. in leveed area;
• High Intensity Buffer -100 ft.
• The Aquatic Environment includes the area waterward of the OHWM and does not have an
identified buffer.
CPL Page 3 of 10
W:\\Long Range Projects\Shoreline\New Shoreline Permits\4-11-12 SSDP Permit
07/17/2014 10:16 AM
Check items
submitted
with
application
Information l,_ quired.
May be waived in unusual cases, upon approval of both Public Works and Planning.
5. Show any levee/riverbank maintenance easements.
6. Construction limit lines and areas of Bearing/grading/filling. See TMC 18.44.070 J for land
altering regulations. Removal of any significant trees or native vegetation in the shoreline
jurisdiction requires a Shoreline Tree Removal and Vegetation Clearing Permit.
7. Show public access and/or trails per TMC 18.44.100.
8. Show building footprint, parking lots, driveways, loading and service areas. See TMC 18.44.070 I
for parking regulations.
9. Identify any sensitive areas and their buffers, as applicable.
D. CROSS -SECTIONS FOR SHORELINE PROJECTS
SHORELINE CROSS SECTIONS at maximum 75' intervals along the shoreline showing:
1. Existing and proposed elevations and improvements;
2. Limits of the applicable shoreline buffer and 200 foot shoreline jurisdiction, as measured from the
OHWM;
3. The top of bank elevation, landward catch point toe of levee, riverbank toe, ordinary high water
mark and base flood elevation (i.e., the 100 year flood as determined by the Federal Emergency
Management Administration - FEMA), and levee/ riverbank maintenance easement and the
location of the top of bank at a 2.5:1 slope.
E. LANDSCAPE PLAN:
1. Landscape planting plan by a Washington State licensed landscape architect or an approved
biologist. Plans must include the type, quantity, spacing and location of all plantings, soil
preparation and amendment, irrigation, weed management, mulching and maintenance plan.
Invasive vegetation must be removed and native vegetation planted. Maximum size 24" x 36". See
TMC 18.44.080 for requirements.
2. Show all existing trees over 4" in caliper, indicating those to be retained, those to be removed and
any tree protection measures required. Any trees removed over 4" in caliper are subject to the
replacement requirements of TMC 18.44.080 B.4.
3. Provide notes on landscaping sheets that address consistency of landscaping with requirements
of TMC 18.44.
F. CIVIL PLANS:
1. One set of all civil plans and analyses shall be stamped, signed and dated by a licensed
professional engineer. Include a graphic scale and north arrow. Maximum size 24" x 36".
2. Vertical datum NAVD 1988 and horizontal datum NAD 83/91. Conversion calculations to
NGVD 1929, if in a flood zone or flood -prone area.
See www.tukwilawa.gov/pubwks/bulletins/cablist.html , Bulletin A7 and related documents for further
information.
3. Existing (dashed) and proposed (solid) topography at 2' intervals.
4. Construction limit lines, areas of clearing/grading/filling including volume and type of expected
cut and fill.
5. Existing and proposed utility easements and improvements.
6. If additional impervious surface is proposed, provide a storm drainage design at least 90%
complete, which meets the King County Surface Water Design Manual (KCSWDM). For guidance
on preparation of the Technical Information Report contact the Public Works Dept. or go
to: www.tukwilawa.gov/pubwks/pwpermit.html#SURFWATER.
CPL Page 4 of 10
W:\\Long Range Projects\Shoreline\New Shoreline Pemvts\4-11-12 SSDP Pennit
07/17/2014 10:16 AM
Check items
submitted
with
application
Information Required.
May be waived in unusual cases, upon approval of both Public Works and Planning.
See also TMC 18.44.070 D for additional surface water regulations.
7. Show the 100 yr. flood plain boundary and elevation as shown on FEMA maps which are
available at the Tukwila Public Works Department counter.
8. Show all site improvements including footprints of all existing and proposed buildings, paved
areas and any shoreline stabilization structures proposed in the shoreline. See TMC 18.44.070 E.
9. Show fences, rockeries and retaining walls.
10. Show docks and other overwater structures. See TMC 18.44.070 K.
G. OTHER PLANS:
1. If new construction is proposed, provide dimensioned and scalable building elevations with
keyed colors and materials. Show mechanical equipment and/or any proposed screening.
2. If site lighting changes are proposed, provide a luminaire plan induding location and type of
street and site lighting. Include proposed fixture cut sheets, site light levels (foot-candles), and what
measures will be used to shield adjacent properties and the river from glare.
3. All existing and proposed signage with sign designs and locations. See TMC 18.44.070 L.
4. Any other drawings or materials needed to explain your proposal.
CPL Page 5 of 10
W:\\Long Range Projects\Shoreline\New Shoreline Permits\4-11-12 SSDP Permit
07/17/2014 10:16 AM
/
°'‘'ZZ4) 7Z)
CITY OF TUKWILA SHORELINE
Department of Community Development SUBSTANTIAL
6300 Southcenter Boulevard, Tukwila, lYA „�-• 1
Telephone: (206) 431-3670 $ t “i L4i ED DEVELOPMENT
SUN 242015 PERMIT
APPLICATION
FOR STAFF USE ONLY Permits Plus Type: P-SHORE
Planner:
File Number: L% 0 '--- s
Application Complete (Date:
)
Project File Number: pL/G ---r/__
Application Incomplete (Date:
)
Other File Numbers: f l/ n.--
NAME OF PROJECT/DEVELOPMENT: Green River Bank Erosion Repair
BRIEF DESCRIPTION OF PROJECT: Install a subsurface drainage system and restore an eroded bank on the Green River.
LOCATION OF PROJECT/DEVELOPMENT: Give street address or, if vacant, indicate lot(s), block and
subdivision, access street, and nearest intersection.
14900 Interurban Avenue South
LIST ALL TAX LOT NUMBERS (this information may be found on your tax statement or NWMaps. net).
Parcel #3597000006
PROJECT VALUE (PLEASE ATTACH DOCUMENTATION): Approximately $65,000
DEVELOPMENT COORDINATOR :
The individual who:
• has decision making authority on behalf of the owner/applicant in meetings with City staff,
• has full responsibility for identifying and satisfying all relevant and sometimes overlapping
development standards, and
• is the primary contact with the City, to whom all notices and reports will be sent.
Name: Thomas Bannister- GeoEngineers, Inc.
Address: 600 Stewart Street, Suite 1700. Seattle, Washington 98101
Phone: (206) 728-2674
E-mail: tbter@geoengin-ers.com
Signature:
FAX:
'73 Date: btkie.._
CPL Page 6 of 10
W:\\Long Range Projects\Shoreline\New Shoreline Permits\4-11-12 SSDP
07/17/2014 10:16 AM
l \
CITY OF TUIKWILA
Department of Community Development
6300 Southcenter Boulevard, Tukwila, WA 98188
Telephone: (206) 431-3670
AFFIDAVIT OF OWNERSHIP AND HOLD HARMLESS
PERMISSION TO ENTER PROPERTY
STATE OF WASHINGTON
COUNTY OF KING
The undersigned being duly sworn and upon oath states as follows:
1. I am the current owner of the property which is the subject of this application.
2. All statements contained in the applications have been prepared by me or my agents and are true and correct to the best of my
knowledge.
3. The application is being submitted with my knowledge and consent.
4. Owner grants the City, its emplo ees, agents,�eigineers, contractors or other representatives the right to enter upon Owner's real
I ` property, located at i Ct J U ZAP L AVE, �,t- .'OT H for the purpose of application
review, for the limited time necessary to complete that purpose.
5. Owner agrees to hold the City harmless for any loss or damage to persons or property occurring on the private property during
the City's entry upon the property, unless the loss or damage is the result of the sole negligence of the City.
6. Non -responsiveness to a City information request for ninety (90) or more days, shall be cause to cancel the application(s)
without refund of fees.
EXECUTED at Tt-i012.14 (x (city), A-Z (state), on J U.JG 5 , 20 /.5
(Print Namg)
320 tJO tb ex -An q..vP-. STE 11tx0,4z
(Address)
(Phone Number) ony
(Signature)
On this day personally appeared before me ,\\AR'A Inc ' ' (k' to me known to be the individual who
executed the foregoing instrument and acknowledged that he/she signed the satne as his/her voluntary act and deed for the uses and
purposes mentioned therein.
SUBSCRIBED AND SWORN TO BEFORE ME ON THIS 1 DAY OF V U N- , 20
LAURA TUCKER
Notary Pubilo • State °Arizona
MARICOPA COUNTY
My Commission Expires March 31, 2018
NOTARY PUBLIC in and for the of Washitigtei 14RtZ6++s
residing at M G R(COpC J N'tvi
My Commission expires on MC( .Cb 311 21)('
\\Deptstore\City Common\Ten1KIRBY - DECEMBER\SEPA Environmental Review Application-Jan2011.Docx
/
CITY OF TUKWILA
Department of Comnruniry Development
6300 Southcenter Boulevard, Tukwila, WA 98188
Telephone: (206) 431-3670
AFFIDAVIT OF OWNERSHIP AND HOLD
PERMISSION TO ENTER PROPERTY
STATE OF WASHINGTON
ss
COUNTY OF KING
The undersigned being duly swo and upon oath states as follows:
1. I am the current owner of the`.roperty which is the subject of this .a plication.
2. All statements contained in th:\applications have been prepared me or my agents and are true and correct to the best
of my knowledge.
3. The application is being submitte with my knowledge and cosent.
4. Owner grants the City, its employe. , agents, engineers, con sactors or other representatives the right to enter upon
Owner's real property, located at
for the purpose of application revie for the limited t. - necessary to complete that purpose.
5. Owner agrees to hold the City harmless or any loss or amage to persons or property occurring on the private property
during the City's entry upon the property, ess the I . s or damage is the result of the sole negligence of the City.
6. Non -responsiveness to a City information re Q uest for ety (90) or more days, shall be cause to cancel the application(s)
without refund of fees.
SS
EXECUTED at
(Print Name)
(Address)
(city), `, (state), on 20
(Phone Number)
(Signature)
On this day personally app ared before a to me known to be the individual
who executed the foregoi g instrument d acknowledged that he/she si i ed the same as his/her voluntary act and deed for
the uses and purposes m ntioned thereEn.
SUBSCRIBED AND SWORN TO BEFORE ME ON THIS DAY OF
NOT PUBLIC in and for the State of Washington
residinaf at
My CcJmmission expires on
,20
CPL Page 7 of 10
W:\\Long Range Projects\Shoreline\New Shoreline Permits\4-11-12 SSDP
07/17/2014 10:16 AM
/
REVIEW GUIDELINES
Applicable City of Tukwila Shoreline Policies:
Please provide a narrative discussion on how your project is consistent with or implements the applicable
Shoreline Master Program goals and policies. A list of these goals and policies can be found in Chapter 6 of
the Shoreline Master Program, see Attachment A to Ordinance
2344: http://www.tukwilawa.gov/dcd/shoreline.html . They are also available at the Tukwila Department of
Community Development. Please discuss with a planner the goals and policies that should be addressed.
Applicable City of Tukwila TMC 18.44, Shoreline Overlay District Criteria:
City staff will review your project against the relevant criteria below. Please make sure you have addressed
the appropriate requirements from TMC 18.44, Shoreline Overlay District in your project.
Applicable
to Project?
Review Criteria and TMC References
PERMITTED USES: The project will be reviewed to ensure the proposed use is consistent with TMC 18.44.030 -
Shoreline Use Matrix, the uses permitted in the relevant shoreline environment and the underlying zoning:
Shoreline Residential See TMC 18.44.040
Urban Conservancy See TMC 18.44.050
High Intensity See TMC 18.44.060
Aquatic See TMC 18.44.065
DEVELOPMENT STANDARDS: the project will be reviewed against the following development standards.
Check with a planner if you have questions on whether a particular development standard applies to your
project. Provide a written response to the development standards or cite a project drawing that responds to the
relevant standard.
General Shoreline Residential Environment Development Standards, TMC 18.44.070 B.
High Intensity, Urban Conservancy and Aquatic Environment Development Standards, TMC
18.44.070 C.
• General Standards
• Setbacks and site configuration
• Height Restrictions
• Lighting
VEGETATION AND
LANDSCAPING TMC 18.44.080
The project will be reviewed for consistency with the SMP's vegetation and landscaping
requirements.
PUBLIC ACCESS TMC 18.44.100
The project will be reviewed for consistency with the public access requirements of the SMP.
CPL Page 8 of 10
W:\\Long Range Projects\Shoreline\New Shoreline Permits\4-11-12 SSDP
07/17/2014 10:16 AM
NO NET LOSS CHECKLIST
What is No Net Loss?
The Washington State Shoreline Management Act (SMA) requires protection of the natural resources and
ecological functions of the shoreline environment. Ecological functions are processes that characterize the
river and its shoreline and form habitats for water- and land -based wildlife and vegetation. Ecological
processes depend on the geology, soil type, topography, climate, and other physical characteristics in the
region. In the Green/Duwamish River watershed, key ecological processes include:
• river flows, tidal fluctuations and saltwater influences;
• creation, transport and deposition of sediment (for example scouring of soils, and erosion and
formation of mud -flats or beaches);
• transport of nutrients (from decomposition of plants and other organic materials);
• provision of woody debris from fallen limbs and trees along the banks or in the water (the trunks
and branches help form pools for fish); and
• water quality (such as vegetation that can help to filter out pollutants that are washed into the river
from parking lots and vegetation that can help reduce temperatures in the river, important for fish,
especially salmon).
These physical and biological processes comprise the ecological functions of the shoreline.
The state guidelines that implement the SMA, adopted in 2003, establish the standard of "no net loss" of
shoreline ecological functions for land uses and development within the shoreline jurisdiction. The No Net
Loss standard is designed to stop the introduction of new negative impacts to shoreline ecological functions
resulting from new development. Tukwila's Shoreline Master Program (SMP) defines no net loss as a:
"...standard intended to ensure that shoreline development or uses, whether permitted or exempt, are
located and designed to avoid loss or degradation of shoreline ecological functions that are
necessary to sustain shoreline natural resources."
In other words, the existing conditions of the shoreline ecological functions should not deteriorate due to new
permitted development or new land use. A loss of ecological function can occur when a physical condition
such as vegetation along the shoreline is removed or when habitat is altered through the construction of a
dock or pier or other structures over this habitat. In order to maintain shoreline ecological functions,
negative impacts must be mitigated to restore an equivalent amount of ecological function. The approach to
mitigation must follow the mitigation sequencing steps adopted in the SMP (see next page). It should be
noted that the SMA and the City's SMP also require improvement of shoreline functions, and therefore, some
re -vegetation of the shoreline will be required in proportion to the scale of the project, regardless of whether
there is a net loss to ecological functions.
CPL Page 9 of 10
W:\\Long Range Projects\Shoreline\New Shoreline Permits\4-11-12 SSDP
07/17/2014 10:16 AM
f\
On a separate sheet of paper, please respond to the following questions to evaluate your
project's impacts and assist in analyzing whether there will be a net loss to shoreline
ecological functions requiring mitigation:
1. Describe the existing condition of the shoreline area and riverbank. For example, what plants and
how much vegetation currently exist within the 200 foot shoreline jurisdiction; what is the condition
of the shoreline (how steep are the banks, is there any erosion or slope failure, what are the soils like);
is there "hard armoring" on the riverbank (for example, concrete or wooden bulkheads, metal sheet
piling, rip -rap [rocks or concrete/asphalt blocks]), is there paving or are there any structures within the
200 ft. shoreline jurisdiction; are there any docks, piers, decks or other structures near or over the
water; are there any above -ground or below ground utilities; etc.?
2. How will your project change the existing condition of the shoreline described above?
3. Please respond to the questions in the following chart - A No Net Loss analysis (prepared by a
qualified biologist) must be prepared if the response to any of the questions in the chart below is
"yes":
WILL THE PROJECT:
NO
YES
a. Alter/remove vegetation in the shoreline jurisdiction?
V
b. Alter the river bank (i.e. re -slope bank, add armoring etc.)?
J
c. Add fill in the shoreline jurisdiction?
J
d. Discharge new stormwater to the river?
V
e. Store or use hazardous materials in the shoreline jurisdiction?
V
£ Construct an in- or over -water structure?
V
g. Increase impervious surface in the shoreline jurisdiction?
V
4. The way to achieve no net loss of ecological function is to mitigate the loss through one or a
combination of the mitigation sequencing steps identified below. If preparing a No Net Loss analysis,
please discuss how your project addresses the following mitigation sequencing steps (TMC 18.44.070
H.3.):
a. Avoiding the impact altogether by not taking a certain action or parts of an action;
b. Minimizing impacts by limiting the degree or magnitude of the action and its implementation
by using appropriate technology or by taking affirmative steps to avoid or reduce impacts;
c. Rectifying the impact by repairing, rehabilitating, or restoring the affected environment;
d. Reducing or eliminating the impact over time by preservation and maintenance operations;
e. Compensating for the impact by replacing, enhancing, or providing substitute resources or
environments; and
f. Monitoring the impact and the compensation projects and taking appropriate corrective
measures.
CPL Page 10 of 10
W:\\Long Range Projects\Shoreline\New Shoreline Permits\4-11-12 SSDP
07/17/2014 10:16 AM