HomeMy WebLinkAboutPermit L94-0031 - CITY OF TUKWILA - MARGINAL WAY SOUTH RIVERBANK REPAIR SHORELINE EXEMPTIONL94 -0031
10601 E. MARGINAL WY S
CITY OF TUKWILA
SHORLINE
EXEMPTION
C i t y of T u k w i l a
I N F O R M A T I O N PAP E R
Department:
Date:
Subject:
BACKGROUND:
PUBLIC WORKS
May 4, 1994
East Marginal Way South
at Associated Groc rs
Riverbank Slough (8014'
North of Boeing Access
Status Report
Project No. 94 -DRO4
For Mayor's Office Only
• Mayor
City Admin
Mayor
For Your Information
Response Requested
Immediate Response
Road)
Late March, 1994 US West represg�nntative Jim Low brought the E
Marginal Way river bank slough (364' north of the Boeing Access
Road) to the attention of Public Works as this slough exposed their
utility pole and fiber optic cable. Public Works staff reviewed
this matter and brought it to the attention of the Utilities
Committee with a recommendation to declare an emergency, stabilize
the river bank •supporting the US West pole /fiber optic cable and
vault; carry out a permanent fix for the affected area; and, apply
for CORPS SECTION 14 FUNDS to have other sections of the.E Marginal
Way S river bank restored through the CORPS.
At the April 4, 1994 Council meeting, Resolution 1295 was passed,
declaring an emergency to deal with the river bank erosion repairs
and authorizing emergency expenditures based on an initial estimate
of $50,000.
ANALYSIS:
The following activities have occurred as the City's response to
this emergency:
1. Public Works maintenance. staff carried out temporary
stabilization of the river bank using ballast, small rocks and
sandbags to protect the US West pole, fiber optics cable,
vault and E Marginal Way roadway shoulder.
2. Public Works engineering staff contracted with Entranco
Engineers to carry out necessary survey and provide base maps
and sections in the slough area.
3. The survey, base maps and sections were completed by Entranco
Engineers last week.
4. Public Works staff have developed a preliminary plan which is
now being circulated for comment.
5. Last week Public Works engineering and CORPS took a boat tour
at low tide ( -2.7) and went up the river to assess the slough
and the entire river bank from the Ox Bow Bridge (S 102.St) to
RECEIVED
MAY 1 01994
COMMUNITY
DEVELOPMENT
Info Paper
May 4, 1994
page two
the Boeing Access Road (video of this section will be shown at
Utilities Committee Meeting). The purpose of this trip was to
further evaluate the scope and nature of the slough out at US
West pole; and, to provide CORPS representatives with an
assessment of erosion and unstable soils problems along the
east river bank from the Ox Bow Bridge to Boeing Access Road.
6. Based on the field investigations, including the recent boat
ride, staff have developed a preliminary estimate for the
immediate fix. The cost of this fix is $100,800 (see attached
preliminary estimate). The reason for increasing our original
estimate is that the riprap that we had observed from across
the river, upon closer inspection at low tide, turned out to
be only small rocks which needed to be replaced with larger
structural size riprap for an additional 60 feet. This
doubled the amount of riprap and river bank to be
rehabilitated.
'7. Public Works staff have submitted requests for waivers for
environmental and shoreline to the Department of Community
Development. Once the environmental process is complete,
submittal for the HPA to State Fish and Wildlife and submittal
for the Nationwide Permit to the CORPS will take place. The
HPA and CORPS process takes six to eight weeks. It is not
anticipated that the permits will be required and the
construction contract will be bid July 15, 1994.
RECOMMENDATION:
Continue with the design' and permitting process. Refine estimate
and report back to the Utilities Committee with budget transfer for
final estimate.
Attachments (3)
Vicinity map
Resolution #1295
Preliminary engineer's estimate
Typical section
cf: Project file 94- DR04.1
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City of Tukwila
Washington
Resolution No /Z '5
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF
TUKWILA, WASHINGTON, DECLARING AN EMERGENCY EXISTS
THAT REQUIRES RIVER BANK EROSION REPAIRS AND
AUTHORIZING EMERGENCY EXPENDITURES.
WHEREAS, a substantial amount of erosion has occurred on the Duwamish River on the
west side of East Marginal Way South, approximately 300 feet north of the Boeing Access Road
within the last week to ten days; and
WHEREAS, the erosion undermined a portion of East Marginal Way South roadway
shoulder and threatened the stability of U.S. West fiber -optic cable, pole and vault; and
WHEREAS, another rain storm or high river and draw down event may further undercut
East Marginal Way South and may topple the pole; and
WHEREAS, the pole may fall into traffic of East Marginal Way South, a high volume
traffic corridor, and the transmission line which serves the Boeing Aircraft Company may be
broken and services disrupted;
NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF TUKWILA,
WASHINGTON, DO HEREBY RESOLVE AS FOLLOWS:
Section 1. Heavy rains have accelerated erosion of the Duwamish River's east bank
approximately 300 feet north of the Boeing Access Road, necessitating immediate emergency
repairs to stabilize river bank and preserve existing utilities.
Section 2. Competitive bidding requirements are hereby dispensed with and the Mayor
is authorized to expend an estimated $50,000 from the Surface Water Management Fund to
construct erosion controls and provide temporary stability.
PASSED BY THE CITY COUNCIL OF THE CII' OF TUKWILA, WASHINGTON, at
a regular meeting thereof this 1 day of /�G - 4.t' t� ,1994.
ATTEST /AUTHENTICATED:
e E. Cantu, City Clerk
APPROVED AS TO FORM:
Office.of the City Attorney
Filed with the City Clerk: - 30 - 99
Passed by the City Council: 11- r/ - f y
Resolution Number
Steve Mullet, Council President
Project Name: EAST MARGINAL WAY SOUTH
EMERGENCY RIVER BANK REPAIR
Project No. :
*******i********************* **** ** *********
*
City of Tukwila
PUBLIC WORKS DEPARTMENT
6300 Southcenter Boulevard
Tukwila, Washington 98188
*
* Date: 5-04-94
*
*
*
*
*
* * * * * * * * * * * * ** * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
ITEM
NO.
1
2
3
4
5
6
7
8
9
10
11
12
11ENG INEER' S
'ESTIMATE
1 UNIT PRICE AMOUNT
== == = = ===
ITEM DESCRIPTION/units 1 QUANTITY
MOBILIZATION / LS 1
TRAFFIC CONTROL / LS 1
CLEARING & GRUBBING / ACRE 0.10
EMBANKMENT EXCAVATION / CY 750
REMOVE GUARDRAIL / LF 200
HEAVY LOOSE RIPRAP / TON 650
QUARRY SPALLS .
/ TON 220
EMBANKMENT COMPACTION / CY 475
GEOGRID FABRIC / SY 1,250
LIVE CUTTINGS / EA 800
CONCRETE BARRIER / LF 200
SEEDING / ACRE 0.10
4,000.00
2,500.00
6,000.00
13.00
4.00
50.00
30.00
6.00
10.00
3.00
30.00
5,000.00
4,000.00
2,500.00
600.00
9,750.00
800.00
32,500.00
6,600.00
2,850.00
12,500.00
2,400.00
6,000.00
500.00
==■■===......================ ======■■==■■===== ============
CONTINGENCY ( 15% )
ESTIMATED TOTAL PROJECT COST
SUB-TOTAL
SALES TAX
TOTAL
$ 81,000.00
( 8.2% ) $ 6,642.00
$ 87,642.00
$ 13,146.30
$ 100,788.30
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Figure 8.8 Vegehted geogrid instolkition using construction jigs ond batter boards.
1. BANK EXCAVATION & PREPARATION Excavated and
FOR FIRST GEOGR|D. reshaped bank
Original bank line
Live branches. ohsa'c,osxed.with
tips exiending beyond bank
Lightly tamped soil suitable for
rooting, watered thorouohly
6-8 in.
� ..�
Rock toe key
2. PLACEMENT OF JIGS AND BATTER BOARDS.
Jig
2 in. x 6 in.
angle iron upright, Eyelet
3 h. high
Batter boards—approx.
2 in. x1n in. x4h.(short
lengths to follow bank curves)
•
welded iron base,,
Typical angle Iron jig
OHWv
' 4::■•---- -
4 ,,,,ft�� �
--- -- ailfilia
3. PLACEMENT OF CO1R FABRIC.
a. Lay fabric pieces on bench seams
overlapping approx. 1 ft.
b. Stake in place.
o. Drape excess labric
over jig.
Coir fabric
1 in. x 2 in.
wood stakes
SECTIONS
8-22 Construction Procedures
SP-10
Figure 8.8 Vegetated geogrid installation using construction jigs and batter boards, continued.
4. WRAPPING AND SECURING COIR FABRIC.
a. Fill bench with soil up to top of batter board,
maintaining 10.15° slope. Water soil.
b. Pull fabric up and over to wrap soil.
c. Stake in place.
OHW .
Coir tabric
1 in. x 2 in.
wood stakes
5. REMOVAL OF JIGS AND BATTER BOARDS.
Slide jigs and batter boards out.
1 in. x 2 in.
wood stakes
Coir fabric '
6. INSTALLATION OF ADDITIONAL GEOGRID LIFTS.
a. Lay another layer of live branches and
soil on top of the geogrid and construct
additional lifts.
b. Seed andlor plant upper bank.
c. Water top soil of every layer.
OHW .
Construction Procedures
SP -11
8.23
• • • • •Vegetated geogrids are very similar to brush layers except that the till soil in the alternate
• layers is wrapped in a natural or synthetic geotextile material (Figure E.7). Vegetated geogrids
are normally installed over rock toe protection. •
Figure 6.7 installation of a vegetated oeogrid .
• Live branches
Fill material �\• ��•� rte„
•*-, �"::"�ems's',
--v— f
. .• - ~y •Ro_1 : toe keyy
• Channel bed
•
•r
yam.: • •.I.
Heicht
varies
While geogrids in smaller pr.ojec;s can be shaped by hand, building la:oe.r, longer oeoarids is
facilitated by using construction jigs anti batter boards (Figure E.6). The jigs, v.'hiGh are con- •
structe0 of angle iron, hold the batter boards that shape the•face •of the lift to match the exist- '
stg *slope contours. Shorter Satter boards %three ;o sou: see; long) and sufficient jigs will
;acili; ate this process. Alter completinc the lift. the ji; are removed with a• backhoe.
Begin cans :ruction by excavating and.shaping the bzn1: for the rot-Aloe. The bench created
c•
SA' the toe should have a 10 to 15 deoree bath- slope. ?lace at lets; six inches of till material
he roc(: followed by a layer of live branches.. The branches should be placed on the till
•a ••rin1 to a random, crosswise pattern that is perpendicular to the strear:lflow
County Drat,
May 5, 1994
City of Tukwila
Department of Public Works
Mr. John Crull
Planning & Program Support
Boeing Support Services
P.O. Box 3707
Seattle, WA 98124 -2207.
John W. Rants, Mayor
Ross A. Earnst, P. E., Director
RE: East Marginal Way South at Associated Grocers - River Bank
Slough, Project No. 94 -DRO4
Request for License to Construct
Dear Mr. Crull:
In accordance with our May 5, 1994 field meeting, I have been
asked to secure a License to Construct from the Boeing Company at
this time for lands owned by Boeing that could be involved in this
river bank rehabilitation project. The License to Construct allows
the City of Tukwila to pursue the necessary permits and approvals.
Please send the executed License to Construct (enclosed) back to me
at the address below.. Your attention to this matter will be most
appreciated.
Sincerely,
Phil Fraser, Senior Engineer
PRF /cd
Enclosures: 3
xc: File: 94- DR04.5
6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 Phone: (2061433.0179
Fax (206) 4313665,
LICENSE TO CONSTRUCT
We, the undersigned, do hereby grant the City of Tukwila and their
contractors, permission to enter upon our property at:
East Marginal Way, South, from the south property line approximately
175 feet north of Boeing Access Road to approximately 600 feet
north of the Boeing Access Road (see attached ownership map) to
provide an emergency repair to the sloughed out river bank
approximately 500 linear feet north of the Boeing Access Road,
property restoration as required. The City of Tukwila further
guarantees to repair or replace vegetation that may be disturbed
with vegetated geogrid embankment or seeding, all to be
accomplished at no cost to the property owner.
Agreed to this day of , 19
CITY OF TUKWILA OWNER
Public.Works Director
The Boeing Company
Please' print:
Authorized agent
Address
City, State, ZIP
Telephone
(typical section and ownership map attached)
City of Tukwila
John W. Rants, Mayor
Department of Community Development Rick Beeler, Director
M E M O R A N D U M
TO: Linda Rankin, DOE Shorelands
FROM: Ann Siegenthaler, DCD
RE: SHORELINE PERMIT EXEMPTION #L94 -0031
East Marginal Way South Riverbank Emergency Repair
DATE: May 20, 1994
Thank you for your assistance in explaining t
exemption process.
shoreline permit
Enclosed is the City of Tukwila approved Exemp ion for the above
project. Included are a vicinity map, proj =ct plans, and our
approval of a SEPA exemption. The Army Corps application has been
filed.
Please let me know if you need any additional 'nformation
(206/431- 3670). Thank you.
cc: File
Phil Fraser
6300 Southcenter Boulevard, Suite #100. • Tukwila, Washington 98188 •
431.3670 . 1',aac (206);;431.3665
To:
EXEMPTION FROM SHORELINE MANAGEMENT ACT
SUBSTANTIAL DEVELOPMENT PERMIT REQUIREMENT
CITY OF TUKWILA:
Ross Earnst, Public Works Director, 6300 Southcenter Blvd.
(name and KKaddress of the applicant)
The proposal by
oss EarnstWlbublic Works Director
to undertake
(name of applicant)
the following development E Marginal Way S at Associated Grocers River Bank
`be specific)
Slough (500 ft north of Boeing Access Road)
upon the following property E Duwamish River Bank (River mile 5.9)
(legal description, i.e., section to
Adjacent to E Marginal Way S on public R/W (E Marginal Way S) and private.
the nearest quarter section)
Refer to property ownership map attached. Property owned by The Boeing Company.
Refer to K.C. QSM: Section SE 4, Township 23, Range 4
within Duwamish River and /or its associated wetlands
(name of water area)
is exempt from the requirements of a substantial development permit
because the development constitutes emergency construction necessary to
remedy an unanticipated and imminent threat to public safety & the environment.
(identify exemptions as outlined in WAC 173 -14 -040)
Application in
(Corps Public Notice Number if available)
The proposed development is consistent or inconsistent with:
CHECK ONE:
CONSISTENT INCONSISTENT
N/A
Policies of the Shoreline
Management Act
The guidelines of the De-
partment of Ecology where
no master program has
been finally approved or
adopted by the department
The master
CONDITIONS APPLY. SEE ATTACHED CONDITIONS
(Date)
•
rogram
ECI
rector, Dept. of
Community Development
EMERGENCY REPAIR OF RIVERBANK ON EAST MARGINAL WAY SOUTH
Shoreline Permit exemption, File #L94 -0031
This exemption has been approved subject to the following
conditions:
1. All emergency exemptions are subject to revocation,
suspension or revision if additional information indicates
that the project does not constitute an emergency.
2. Equipment and construction methods shall use best
management practices to ensure protection of existing
vegetation in the project area.
3. To reduce erosion, work on the toe of the bank shall be
scheduled for low flows /low tide.
4. A silt loam topsoil shall be used as fill material in the
vegetated geogrid portion, to provide adequate nutrients
and moisture retention.
5. Vegetation and live cuttings shall consist of native,
locally - collected species (e.g. willow, red osier dogwood,
alder, etc.), to ensure acclimatization and compatibility
with the local environment.
6. Planting of the live cuttings shall be accomplished within
24 hours of harvesting to promote sprouting and survival;
and cuttings shall be kept wet and cool.
7. Plantings which do not survive shall be replaced within one
year of failure.
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VICINITY MAP
NOT TO SCALE
t'IPIR 3 11994
EAST MARGINAL WAY COMMUNITYFIG. '1
BOEING ACCESS ROAD TO NORTH CITY LIMITS DEVELOPMENT /
3
M E M O R A N D U M
TO: Rick Beeler 4,
FROM: Ann SiegenthalerAiii0
AMP
RE: EMERGENCY REP R OF RIVERBANK ON EAST MARGINAL WAY SOUTH
SEPA Exempt Fi e #L94 -0029; Shoreline Exempt File #L94 -0031
DATE: May 18, 1994
BACKGROUND:
The riverbank along East Marginal Way South at the Boeing Access
Road caved in ca. March 1994. The cave -in has de- stabilized
adjacent portions of the riverbank, and threatens the right -of -way,
a utility pole and fiber optic cable. To pursue immediate repair,
Public Works is requesting an "emergency" exemption from SEPA and
Shoreline permit requirements.
This is similar to the emergency exemption DCD approved last year
for the South 104th street riverbank. Without immediate action by
Public Works, there is a risk of further riverbank sloughing and
damage to infrastructure. Public Works needs an emergency permit
from the Army Corps of Engineers. To obtain that permit, Public
works must demonstrate that they have the Fisheries HPA and
appropriate SEPA. and Shoreline "approvals." The HPA cannot be
issued until SEPA and Shoreline review is complete. The normal
review processes for SEPA and Shoreline permits will prevent timely
remedial action.
EMERGENCY EXEMPTION PROVISIONS:
SEPA allows exemptions for "actions that must be undertaken
immediately or within a time too short to allow full compliance
with this chapter, to avoid an imminent threat to public health or
safety....or property..." (WAC 197 -11 -880).
Shorelines Mgmt. Act exempts "emergency construction necessary to
protect property from damage by the elements..." or to correct
imminent threat to public health, safety...within a time too short
to allow full compliance...(WAC 173 -14 -040).
SHORELINE AND ENVIRONMENTAL IMPACTS:
The project meets the criteria for SEPA and shorelines exemptions.
It appears to meet the intent of SEPA and shoreline policies. It
EMWS Riverbank repair
5/18/94, Page 2
addresses the major issues, similar to what we have approved on
past riverbank repair projects.
To address habitat issues, the bank will be repaired using
bioengineering techniques: rip -rap below OHWM (Fisheries
requirement), with geogrid matting and live cuttings. The best
"window" for harvesting and planting of live cuttings is past;
therefore, the project will need to be carefully planned and
monitored. As a thorough review is not possible now, we should
specify some conditions.
RECOMMENDATION:
I recommend conditional approval of the two emergency exemptions.
Conditions are based on potential impacts, discussion with Phil and
Gary Schulz' recommendations on the 1993 South 104th bank
stabilization project. Recommended conditions are as follows:
1. All emergency exemptions are subject to revocation,
suspension or revision if additional information indicates
that the project does not constitute an emergency.
2. Equipment
management
vegetation
3. To reduce
scheduled
and construction methods shall use best
practices to ensure protection of existing
in the project area.
erosion, work on the toe of the bank shall be
for low flows /low tide.
4. A silt loam topsoil shall be used as fill material in the
vegetated geogrid portion, to provide adequate nutrients
and moisture retention.
5. Vegetation and live cuttings shall consist of native,
locally- collected species (e.g. willow, red osier dogwood,
alder, etc.), to ensure acclimatization and compatibility
with the local environment.
6. Planting of the live cuttings shall be accomplished within
24 hours of harvesting to promote sprouting and survival;
and cuttings shall be kept wet and cool.
7. Plantings which do not survive shall be replaced within one
year of failure.
cc: File
Phil Fraser
:
CITY OF TUKWILA
DETERMINATION OF SEPA EXEMPTION
DESCRIPTION OF PROPOSAL:
Carry out fix on an emergency basis now, which includes:
Provide riprap buttress at 2:1 slope to OHWM /above OHWM geogrid at
minimum 1.75:1 (requires move toe out to original location, as currently
less than 1:1). About 650 tons of rock and 475 CY of geogrid /backfill will
be needed. The cost range of this work is estimated between $85,000 and $100,000.
PROPONENT: CITY OF T'UKWILA PUBLIC WORKS DEPARTMENT
LOCATION OF PROPOSAL, INCLUDING STREET ADDRESS, IF ANY:
ADDRESS:
PARCEL NO:
SEC /TWN /RNG:
LEAD AGENCY:
E Marginal Way S, 500 north of Boeing Access Road
Public R/W and Parcel No. 042304 -9047
Section SE 4, Township 23, Range 4
CITY OF TUKWILA FILE NO: N/A
The City has determined that the above proposal is exempt from SEPA.
permit requirements per RCW 43.21. This decision was made after
review of the project description, existing conditions, proposed
remedies and drawings and other information on file with the lead
agency. This information is available to the public on request.
********************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * **
This exemption decision made and signed this a) day of
1994.
CONDITIO
L'
-ac :eeler, Responsible Official.
City of Tukwila, (206) 431 -3680
6300 Southcenter Boulevard
Tukwila, WA 98188
SEE ATTACHED CONDITIONS OF EXEMPTION DECISION.
Copies of the procedures for SEPA exemption are available with the
City Clerk and Department of Community Development.
mima f
EMERGENCY REPAIR OF RIVERBANK ON EAST MARGINAL WAY SOUTH
SEPA Permit exemption, File #L94 -0029
This exemption has been approved subject to the following
conditions:
1. All emergency exemptions are subject to revocation,
suspension or revision if additional information indicates
that the project does not constitute an emergency.
2. Equipment and construction methods shall use best
management practices to ensure protection of existing
vegetation in the project area.
3. To reduce erosion, work on the toe of the bank shall be
scheduled for low flows /low tide.
4. A silt loam topsoil shall be used as fill material in the
vegetated geogrid portion, to provide adequate nutrients
and moisture retention.
5. Vegetation and live cuttings, shall consist of native, .
locally - collected species (e.g. willow, red osier dogwood,
alder, etc.), to ensure acclimatization and compatibility
with the local environment.
6. Planting of the live cuttings shall be accomplished within
24 hours of harvesting to promote sprouting and . survival;
and cuttings shall be kept wet and cool.
7. Plantings which do not survive shall be replaced within one
year of failure.
TO:
FROM:
DATE:
City of Tukwila
John W Rants, Mayor
Department of Public Works Ross A. Earnst, P. E., Director
M E M O R A N D U M
Rick Beeler, (SEPA Official) via Ann Siegenthaler
SUBJECT: E Marginal Way S at Associated Grocers
River Bank Slough (500' North of Boeing Access Road)
Project No. 94 -DRO4
Recently, a 20 foot wide strip of the Duwamish river bank sloughed
away next to E Marginal Way S, about 500' north of the Boeing
Access Road. PW staff reported this issue to the 3/29/94 Utilities
Committee, recommending an emergency fix to protect the US West
pole and fiber optic cable, and also E Marginal Way S, a public
road. The Utilities Committee referred the issue to the 4/4/94
Regular Council, which passed Resolution No. 1295, declaring an
emergency.
Corps of Engineers staff informed me that application to the CORPS
is required for this type of emergency fix for CORPS approval.
Public Works staff field reviewed this matter with state Department
of Fisheries personnel last month; we were requested to provide the
three small peninsulas shown on the plans for fish habitat. To
meet Fisheries time restraints, the CORPS emergency permit process
requires this information right away (to be part of the HPA and
CORPS applications now being prepared by Public Works).
As shown on the attached plans, the fix includes riprap from the
toe of the river to the OHWM; then vegetated geogrid layered with
live cuttings from the OHWM to the top of bank. This repair is in
keeping with King County's Guidelines for Riverbank Stabilization,
Tukwila's Shorelines permit requirements, and the State Department
of Fisheries requirements.
Both Fisheries and the CORPS require the SEPA Official's input on
SEPA determinations for this project as part of their permit
application. Your cooperation on an expeditious review of this
matter is most appreciated.
PRF /cd
Attachments: 3
xc: File 94- DR04.6
RECEIVED
W 1 01994
COMMUNITY
DEVELOPMENT
94dro4.men
6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • Phone: (206) 433 -0179 • Fax (206) 4313665
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a
e E. Cantu, City Clerk
APPROVED AS TO FORM:
NI 1
r- -r
A "Irn RECEIVED
MAY 1 0.1994
COMMUNITY
DEVELOPMENT
Figure 8.8 Vegetated geogrid installation using construction jigs and batter boards.
1. BANK EXCAVATION & PREPARATION
Excavated and
FOR FIRST GEOGRID. reshaped bank
Original bank line
Live branches. criss•crossed, with
tips extending beyond bank
Lightly tamped soil suitable for
rooting, watered thoroughly
Rock toe key .
2. PLACEMENT OF JIGS AND BATTER BOARDS.
2 in. x 6 in.
angle iron upright,
3 ft. high
•
1/2 in. x 6 in.
welded iron base,.
3 ft. long
Typical angle Iron Jig
OHW-v
Jig
Eyelet
„saw'
00411b
4,000.
Batter boards—approx.
2 in. x 10 in. x4 ft. (short
lengths to follow bank curves)
3. PLACEMENT OF COIR FABRIC.
a. Lay fabric pieces on bench, seams
overlapping approx. 1 ft.
b. Stake in place.
c. Drape excess fabric
over jig.
OHWy
Coir fabric
1 in. x 2 in.
wood stakes
SECTIONS
8.22
SP-10
Construction Procedures
Figure 8.8
Vegetated geog�id installation using construction jigs and batter hoards, continued.
4. WRAPPING AND SECURING COIR FABRIC.
a. Fill bench with soil up to top of batter board,
maintaining 10 -15° slope. Water soil.
b. Pull fabric up and over to wrap soil.
c. Stake in place.
OHW
Coir fabric
1 in. x 2 in.
wood stakes
5. REMOVAL OF JIGS AND BATTER BOARDS.
Slide jigs and batter boards out.
OHW •
Coir fabric •
1 in. x 2 in
wood stakes
6. INSTALLATION OF ADDfrIONAL GEOGRID LIFTS.
a. Lay another layer of live branches and
soil on top of the geogrid and construct
additional lifts.
b. Seed and/or plant upper bank.
c. Water top soil of every layer.
OHW
Construction Procedures
SP -11
8.23
..,,vegetated oeogrid's are very similar C ush layers except that the till soil in th •agate
•
• layers is wrapped in a natural or synthetic geotextile material (Figure 8.7). Vegetated y_ogrids
are normally installed over rock toe protection. •
Figure 6.7 Installation of a vegetated oeogrid .
Geotextile Iabri.. •
Live branches
Fill material
4'
•
•
/1-2 :.
r ? latch
varies
• Channel bed •
While oeo:rids in smaller projects can be shaped by hand, building larger., longer oeoorids is
•• facilitated by using construction jigs and batter bcares•(Figure E.S). The jics, v••hich are con-
structed of angle iron, hold he batter boards that shape the•face•o1 the lift to match the-exist- '
mg slope contours. Shorter batter boars (three to our feet Iona) and sufficient jiffs will
• 1,
facilitate this process. I.f;er completing The lift, the ji; are removed with z• backhoe.
Elgin construction by excavating ant; shaping the bank f or he rock•;oe. The bench created
•Iv the toe should have a 10 to 15 degree back•slooe. Place at least six inches of fill material
_over he roc% followed by a layer of live branches. The branches should: be placed on the {ill
_ a ;••ri ?l in a random. crc.SSwis_ pattern the; ; is perpendicular to the streamtlow.
;Kg County Drat
!Si :
MEMORANDUM
TO: Phil Fraser, Senior Engineer
FROM: Gary Schulz, Urban Environmentalist
DATE: September 8, 1993
RE: South 104th Street/Duwamish Bank Stabilization
As you requested, willow harvesting and planting criteria used in the Boeing project SEPA
checklist comments and conditions are listed below. I've also included some other design
features that were required as part of the willow layer installation.
1) Measures to reduce erosion would include scheduling the toe of bank /river bottom
work during low flows and low tide. This would allow at least 4 hours each day for
excavation and rock placement work below the mean high water mark.
2) A silt loam topsoil should be used as fill material for the portion of the new bank
that will be installed wit$ vegetated geogrids. An organic- mixture should help with
providing nutrients and retaining moisture..
3) Per King County SWM recommendations, the harvesting and planting of the live
willow cuttings should occur within the same 24 hour period or sooner to promote
survival and sprouting. Several species can be used together and known salt - tolerant
species are appropriate for the lower layers. Hooker (Salix hookeriana) and Pacific .
willow (Salix lasiandra) are reportedly known to tolerate some brackish conditions.
Red osier dogwood (Cornus stolonifera) is also a highly recommended shrub to
incorporate into this plan. Other species for dryer conditions may be used to
vegetate the upper portion of the restored bank. These can be planted as rooted
nursery stock and could include snowberry (Symphoricarpos alba), Oregon grape
(Mahonia spp.), wild rose (Rosa gymnocarpa).
Using local willow species is very important for adaptability and minimizing the
amount of time needed to harvest the cuttings and transfer them to the site. It is •
very important during dry weather to keep the willows wet and cool. Watering needs
to be provided at the construction site.
104th Street Memorandum
September 8, 1993
Page 2
Attached are the specifications that were recommended for the Boeing bank project. I
haven't condensed them into a format that the City can send out but they are useful and
should be incorporated into your construction plan. I would not advise sending them out
in your bid package as Raedeke Associates' planting specifications. However, you may want
to include copies of King County's Guidelines Bank Stabilization - Chapter 8 Construction
Procedures.
:July 10, 1993'
,Duwamish River Bank Stabilization
93040
•
•• PLANTING SPECIFICATIONS
Limitations: Summer harvesting and planting of live.cuttings are not
generally recommended. For best results; this work
should occur during the dormant season (■ovember -
March). Therefore, the utmost care and adherence to
these planting specifications are critical to maximize the
success of this project work. In addition? limited success •
should be expected and replanting activities should be
planned for in the fall, as necessary.
Harvest/Transport of Live Cuttings
Location: Black River Pumping Plant, Renton, Washington
Raedeke Associates, Inc. to flag specific areas as where
contractors may harvest cuttings.
On -site pre - construction meeting: Raedeke Associates, Inc. to conduct brief
• overview. .
Cutting specifications: 5 -7' cuttings of selected willow species, 112" - 2"
diameter.
•Cut bottom of stein at 45 degree angle; top of stem should
be blunt cut. _
Cut all stems approx. 8-10" above ground level.
Cut only 50% of existing plants (subject to modification).
Leave vegetative screen along river bank intact.
Stern Preparation: Cuttings should be immersed in water tank immediately
after cutting and during preparation.
Cleanly remove leaves.
Leave side branches and bark intact. .
Bundle similar lengths•together, 4" diameter bundles,
using untreated twine.
Stack bundles in transport; keep moist and covered with a
tarpauline.
Installation: Install all cuttings on the same day as when cut.
Keep moist and covered until just before planting.
Do not allow to lie in direct sunlight at any time.
Place bundles horizontally on prepared, well - compacted
soil bed, with basal ends contacting compacted or native
soil and top ends approximately 6" above finished grade.
Basal ends should be angled so to be lower than top ends.
Arrange bundles between and above facing rocks.
Space approximately 2 -3 feet on center, diagonal spacing.
Be sure soil is tamped firmly around the bundles for good
soil -stem contact.
RAEDEKE ASSOCIATES, INC.
5711 Northeast 63rd St. Seattle, WA 98115
(206) 525 -8122
July 10, 1993
Duwamish River Bank Stabilization
Page 2
Quality Control:
Also install 2 -3" live stakes vertically (perpendicular to
slope) along created bench amoung horizontal bundles.
If compacted backfill soil is dry, carefully soak planted
area at the end of the working day. Do not allow
irrigation water to erode soil or super - saturate the bank.
Do not use any cuttings or live stakes that are split.
Keep all cuttings moist and covered at all times.
Raedeke Associates, Inc. will be on site at appropriate
times.
Inspect 1 -2 times per week for the first 2 months, or as
appropriate.
Be prepared to perform replanting operations in the fall.
JUL 07 '93 11:38lh1 DEP _..FISHERIES
DEPARTMENT OF FISHERIES
HYDRAULIC PROJECT
APPROVAL .
R.C.W. 75.20.3.00
R.C.W. 75 .20 .3.03
Juy 7, 2.993
(applicant should refer to th(c date in all
. PAGE 1 OF 2 PAGES
P. 2
DEPARTMENT.OF FISHERIES
General Administration lido.
Olympia. washIr ton 98504
(206) 753-6650
correspondence)
FIRST 16 CONTACT PHONE(S) '
433 -0179
CONTROL NLMiER
I 00- 61373 -01
LAST NAME
City Tukwila
of
fp s -URAL thcenter Blvd., Ste 100, ATTN: Mr. Fras
6300
7 q 09A
.00C!
CIT Tukwila W TE 9B188
•
17
DATErDuwamish River TElilotTDBay
ED Bank. Porotecuaon
•
f1TfpUARTER SECTION . TOWNSHIP • RANGE(E•N) COUNTY
—"SECTION NE 04 23N 04E • King
TIME LIMITATIONS: IIR
I AND MUST OE COMPLETED SY
L=:
Immediately October 15 1993
. •PROVAL IS 0 = AVAILABLE ON THE • . . T AT ALL T ,e ND 1 S • - • 10NS FOLL• . • PY .E • ; EE AND OP ; TOR P R .1; G
. THE ! 0RK.
1 �• c iV 0 p..g,
.
provide habitat
accomplished in
features.remain
flowing stream
in the stream to
shall be placed in
that can. be•utilizec
to develop the toe,
line'toe as possible
Ordinary High Water
with vegetation
received
that will prevent •
•
c r a ., •. • ;s 1 ■
1. The existing piling along this reach of river
for fish. the armament of this bank shall.be
a manner that will ensure that these habitat
as .fish 'habitat subsequent to this project.
2. Equipment shall net enter or operate within the
except-that large angular boulders may be placed
form the toe of the new bank line.
3. The'large angular boulders used to form the toe
a manner •tha ►. will provide space between them
by fish as hiding areas. These boulders, used
shall be placed as close to the existing bank
4. Rock shall be placed to the elevation of the
Line only. The remaining bank shall be armored
as shown in the plans suBmitted with your application
on July 1, 1993. `
5. Bank sloping shall be accomplished in a manner
the release of overburden material into the water.
sEPA; Exempt, applicant declared an emergency.
REGIONAL HABITAT MANAGER • 'Joe Rebel (206) 902-2566
PATROL • . Lambert [2)
APPLICANT • WILDLIFE • READER • PATROL • NAB. MGR. • WRIA
DEPARTMENT OF FISHERIES • % , .- �,.u,�,;,,... ' /. DIRECTOR
DEPARTMENT OF FISHERIES
AJ...Y 1 r 1.J1 I�Ilwi�.:•
HYDRAULIC PROJECT
APPROVAL
0
R.C. P. 75.2'0.100 DEPARTMENT OF FISHERIES
R.C.W. 75.2 0.103 General Administration Itdg.
• July 7� 1993 Olympia, h75S- 911504
(applicant should refer to this date in all correspondence)
PAGE, OF 2,_. PAGES
10 LAST kAME
City of Tukwila
12 WATERDuwamish River
MinCONTACT PHONE(S)
433 -0179
tECOWTROL NUMUER
00- 61373 -01
EWRIA
09,0001
6. The new bank shall be reassessed during the summer of 1994' to
determine the success of vegetation. If adeto quate vegetation has
not become established it may be necessary replant the bank
line a second time.
LOCATION: South of Boeing OxBoW bridge.'
52.019:1h
THIS APP1, "ALAS TO BE AVAILABLE ON T JOB SITE AT.
ALL TIMES AND ITS PROVISIONS FOLLOWED BY THE
FERMITTEE AND OPERATOR PERFORMING THE WORK
THE PERSON(S) TO WHOM THIS APPROVAL IS ISSUED MAY BE HELD LIABLE FOR ANY
LOSS OR DAMAGE TO F1SHLIFE OR FISH HABITAT WHICH RESULTS FROM FAILURE TO •
COMPLY. VilTH THE PROVISIONS OF THIS APPROVAL.
FAILURE TO COMPLY WITH THE PROVISIONS OF THIS APPROVAL COULD RESULT IN A
CIVIL PENALTY OF UP TO ONE HUNDRED DOLLARS PER DAY OR A GROSS MISDEMEANOR
C•HARC ;E, POSSIBLY PUNISHABLE BY FINE OR IMPRISONMENT.
ALL HYDRAULIC PROJECT APPROVALS ISSUED PURSUANT TO RCW 75.20.100 ARE
SUBJECT TO ADDITIONAL RESTRICTIONS, CONDITIONS, OR REVOCATION IF THE
DEPARTMENT OF FISHERIES OR DEPARTMENT OF WILDLIFE DETERMINE THAT NEW
BIOLOCJICAL OR PHYSICAL INFORMATION INDICATES THE NEED FOR SUCH ACTION. THE
PERMITTEE HAS THE. RIGHT PURSUANT TO CHAPTER 3:.04 RCW TO APPEAL SUCH •
DECISIONS, ALL HYDRAULIC PROJECT APPROVALS ISSUED PURSUANT TO RCW 75,20,1Q3 MAY
BE MC)DIFIEC) BY THE DEPARTMENT OF FISHERIES OR DEPARTMENT OF WILDLIFE DUE. TO
CHANGED CONDITIONS AFTER CONSULTATION WITH THE PERMITTEE: PROVIDED HOWEVER,
THAT SUCH MODIFICATIONS SHALI. BE. SUBJECT TO APPEAL TO THE HYDRAULIC APPEALS
BOARD ESTABLISHED IN RCW 75.20.130.
THIS APPROVAL PERTAINS ONLY TO THE PROVISIONS OF THE FISHERIES AND
\V11 DL 1F E CODES. ADDITIONAL AUTHORIZATION FROM OTHER PUBLIC AGENCIES MAY BE
NECESSARY FOR THIS PROJECT.
APP1CAIS - GENERAL 1Nf1ORMA'r1ON
11: YOU WISI1 TO APPEAL DENIAL. OR CONDITIONS OF AN HPA, Ti-DiRE ARE INFORMAL AND FORMAL APPEAL
I'kOCESSI S AVAILABLE.
• . I`FORM•AI. APPEALS: •
AN INFORMAL APPEAL (WAC :20- l 10.340) CONSISTS OF CONTACTING TAG.! REGIONAL HABITAT
MANAGER AND DISCUSSING YOUR CONCERNS. MOS I PROBLEMS ARE RESOI.VED AT THIS LEVEL, BUT 11'
Ntt I', YC)U MAY ELEVATE YOUR CONCERNS '1'C) '1'1I}1 CHIEF C)1: THE H AIlITA•1' MANAGEMENT T DIVISION IN
OLYMPIA. THE HABITAT MANAGEMENT DIVISION CHIEF'S DECISION SHALL BE APPROVED OR
I) :SAPPHOV1:1) F.Y THE 1.)IHl°.('1'OH OR DESIGNEE.. 11? YOU ARE NOT SATISFIED '.VATIC Tlx: RESULTS OF TR.!
INFORMAL APPEAL, A FORMAI. AI P1 A1. MAY RE 111.ED.
ii. PORMAL APPEALS: .
I) FOR ALL CIVI1. PENA1:1'1' APPEALS AND FOR OTHER HPA APPEALS Wl-UCH ARE NOT ASSOCIATED WITI
IRRIGATION OR S'1'OCR•µ'A'r1iRING DIVERSIONS, A W.ITPEN APPEAL REQULLT MUST BE FILED WITH TKc
I)JiPARJ'MIiN'1' THAT ISSUED OR DENIED 1'11]1 APPHOVAI. OR LJivll:r) THE CIVI1. PHNALTY YOU AR1"s
APPEALING (VVAC 220-110•350).
21 FOR APPEALS 01: DENIAL OR C:ONDI1'IoNS OF AN HPA ASSOCIATED Vr (TH 1R}UGATION OR STOCK•
WAIT11INU DIVERSIONS OTHER THAN C :IV11. PENALTY APPEALS, A K'kl'["1'EN APPEAL RF.OUFST MUST EE
1'11.1 {I) WITH TIC: HYDRAULIC: APPL''ALS BOARD PER Yt'AC 259.04. THE MAILING ADDRESS OF TI-IE BOARD IS: ENVIRONMENTAL HEARINGS OFFICE, BUILDING TWO :RowE. Six, LACEY,:
V1'AS111Nt:TON ygSU;; TELEPHONE 206/459-63:7.
31 F',1II.UKI: 1T) APPEAL. WITHIN 30 DAYS OF TIM DATE OF ACTION. YOU ARF APPEALING 'RESULTS IN
')'U14l:Iti'1'Uki 01: A1.1. APPEAL RIGlrrs. .
APPLICATION FOR DE,. iTMENT OF THE ARMY PERMIT
(33 CFR 325)
OMB APPROVAL NO. 0710 -0003
1 Expires 30 Soptembor 1992
Pudic r.porsng aroen for errs eotr.Ctgn of inbmebon r ..tmal.d b swag. 6 twos o« waponw for to meior1ry of cases. Including e,. tone for rwrawng kreuctons,
wretong ..issng Gat. awes, p.errxq and maintaining ote Gala rwo.d, rod etenpl•eng Yid r.vie,ring tin. eoI.cton 01 Intcematon. Aoplutaos for Irgee or mom Combs
peoracta, a Mow, In acotockaly windows Waal. MAC talcs up to 600 hours. Sand comment. repwdng etis burd.n.Nmate es any Dew aspect of ere dofi.ctcn d Infornoasorl.
"wooing aupowliona for r.ouenp ere Wolin, b D.p.ransint of oaten, Washington hroourws Services. D ra e:sat. for Information Operations and Reports. 1215 Jenr.on
Davis Hoh -.y. Wu 1204. NMnpon. VA 22202-4302: and to M Office or Management and Budget, Paperwork Fi.ouction Propel (0710.0003), Washington, DC 73503. Plwse DO
NOT FETLAN your domot.l.d form b arvw 01 P1... 100r.s -.s,
The Dopanm&nl 01 the Army permll pr0prath i$ autflorized by Section 10 01 Ina Rivers and Harbors Act 01 1899, Section 404 of Ina Clean Water Act ano
Section 103 of the Marina, Protection, Research and Sanctuaries Act These laws require permits authonzing activtues in or affecting navigable waters 01 Inc
United States. the discharge 01 oreoged or el: maten& into waters of vie United States, and Ine vansponation 01 oreoped material for tree purpose of oumping it
into ocean waters. Inlormauon provloed on this form will be used in evaluating the application for a permit Inlormauon in tuts application is maoe a matter CO
public rococo through issuance of a public notice. Disclosure of the inlorrnab0n repuested is voluntary; however, Inc data reouesteC are necessary in oroer to
communicate with the applicant and to evaluate the penult apphcauon. 11 necessary tnlormauon is not provided, tine permit application cannot be processed not
can a permit be issued.
One set 01 original drawings or good reproducible copies wnich snow me locauon and character Mine proposed acuviiy must be attached to this appluWlion
(see sample drewinps and instructions) and be sat: nined to me District Engineer having junsorcuon over Inc location dine proposed activity. An application
tnat is not completed in lull will be returned.
1. APPLICATION NUMBER (7o be assipnao oy Corps)
2. NAME AND ADDRESS OF APPLICANT
Ross Earnst, Public Works Director
Tukwila Public Works Department
6300 Southcenter Blvd.
Telephone
Tukwila , WA�98188
AT;( 2. 2 — c. ► C \ ✓ (Residence)
we (206 433 -0179 (OIL e)
�TJVtyul L`r (LEW'
3. NAME. ADDRESS , AND TITLE OP AUTHORIZED AGENT
Phil Fraser, Senior. Engineer
Tukwila Public Works Dept. •
6300 Southcenter Blvd., Tukwila WA 98188
Teiepnone no. owing business Hours
s'e'c (206' 524 -5177
A,c (20 433 -0179
(Residence)
(011rce)
or.sY'
Statanwnt of Autnorizalion: I hereby designate and authorize Phi 1 Fraser,
Surface Water Engineer to act in my
banal' as my agent in the processing or this permit application and to
furnish. upon moues:, supplemental information to support of Ire appl shun.
.T APPLICM.
eon_ Rb3s ' J tt.r' iT
t DETAILED DESCRIPTION OF PROPOSED ACTIVITY
DATE
9/3/93
<a. ACTIVITY
At riverbank slough (river mile 5.6 /east bank) adjacent to South 104th Street
about 150 1.f. south of Oxbow .Bi1i dge: Provide 35 1.f. of riprap (4 -6 man rocks)
buttress (2:1 slope) from toe of Duwamish to OHWM (5.0 ft. elevation) and tie
into original river bank riprap'(256 c.y.); from OHWM to top of bank provide layered
vegetated geogrid (1.75:1 slope) (s P' A s.'
PURPOSE
To protect South 104th Street pavement and traveling public: Provide emergency
repair of existing river bank riprap (originally built by King County SWM) a 35'
section which has sloughed into the Duwamish. This repair will use current
standards as specified in King County's guidelines for river bank stabilization.
•c DISCHARGE OF DREDGED On FILL MATERIAL
256 c.y. (calculated) of riprap fill material (4 man to 6 man angular rocks)
ENG FORM 4345, Jan 91
EDTIDt. 0 Apia li IS OBSOLETE (Proponent. CECW -ON)
NAMES ANt7 ADDRESSES OF ADJOINING PROPERTY OWNERS. LESSEES. ETC.. WHGSS PROPERTY ALSO ADJOINS THE WATERWAY
John S. Roach
3720 80th S.E.
Mercer Island, WA (see attached property ownership map)
WATERBOOY AND LOCATION ON WATERBO0Y WHERE ACTIVITY EXISTS OR IS PROPOSED
Refer to K.C. Quarter section map: Section: NE 4, Township: 23,
Range: 4
Duwamish River, River Mile 5.6; east bank
' LOCATION ON LAND WHERE ACTIVITY EXISTS OR IS PROPOSED
ADDRESS: Adjacent to South 104th Street, about 150 1.f. south of Oxbow Bridge (see
attached vicinity map)
STREET. ROAD. ROUTE OR OTHER DESCRIPTIVE LOCATION
King
Washington 98188
COUNTY
City of Tukwila
STATE ZIP CODE
LOCAL GOVERNING SOOT WITH JURISDICTION OVERSITE
• Is any Portion of the activity nor which authorization is sought now competa7 ❑ YES lb NO
if answer is 'yes' give reasons, month and year 1M activity was competed. Indicate the twisting work on 11141 drawings
1 List all approvals or certifications and denials received from other federal. interstate. state or kcal agencies for any structures. construction. discharges or other
activities described in this application.
ISSUING AGENCY TYPE APPROVAL. IDENTIFICATION NO. GATE OF APPLICATION DATE OF APPROVAL DATE OF DENIAL
State Dept of
Fisheries HPA 00- 61373 -01 7/2/93 7/7/93 •
Tukwila PW FZCP Will be issued 4y PW at time of construction
Tukwila DCD DCD Shoreline Official: This project exempt 9/'3/93
Tukwila DCD Environ-
mental SEPA official: This project exempt 9/'3/93
0. Application is hereoy made for a permit or permits to auuIorite 1M activities described herein. I certify that I am familiar with Me information contained in the
aoolication. and that to the best of my knowledge and babel such information is true complete. and accurate. 1 What cattily that 1 possess tM authoriry to
undertake the proposed activities or l'am acting as the duty authorized agent ol the applicant.
FbrL 'Ross EA1INST 'C) P Ali
SIGNATURE OF APPLICANT./
T.
61/3(93
GATE
SIGNATURE OF AGENT
`V 3 /93
OATE
The application must be signed by the person who desires to undertake the proposed activity (applicant) or it may be signed by a duly
authorized agent if the statement in block 3 has been tilled out and signed.
18 U.S.C. Section 1001 provides that Whoever, in any manlier within the jurisdiction of any department or agency ol The United States
knowingly and willfully falsifies. conceals, or corers up by any Vick, scheme, or device a material fact or makes any false. fictitious or fraudulent
statements or representations or makes or uses any false writing or document knowing same 10 contain any false fiClltiOUS Or
fraudulent statement cc entry. shall be fined not more than $10.000 or imprisoned not more than five years. or both.
ma'area al era FOAM Nis)
PEDESTRIAN RAILING
BACK OF SIDEWALK
VERTICAL EDGE
EXISTING VEGETATION
20-
15-
10-
5
v
EAST MARGINAL WAY SOUTH
PROPOSED IMPROVEMENTS
/
8
/
,
#1 S J
.ORDINARY HIGH WATER
40'
EXST. GROUND LINE
60'
RIVER ENVIRONMENT
LOW IMPACT 'ENVIRONMENT
20.
10.
NM MINI
E N T R A N C O 413.
ENGINEERS • SCIENTISTS • RIMERS • 9 EYORS.
WASIINGTON ARIZONA CALFORNIA
EAST MARGINAL WAY SOUTH •
EAST MARGINAL WAY SOUTH
PROPOSED IMPROVEMENTS
/ Delft
:tar
.ORDINARY HIGH WATER
40'
EXST. GROUND LINE
60'
RIVER ENVIRONMENT
LOW IMPACT ENVIRONMENT
20
10
0
—20
----- -- --- 15
10
20
—- 10
— 5
—0
- -5
30 40
MI— MIK - :_ s■�s
SCALE 11:20-.
EAST MARGINAL WAY SOUTH
RECEIVED
MAR 3.• 1, 1994
c,OMMUNITY •.
DEVELOPMENT.:,
TYPICAL SECTION
VICINITY OF STA. 42 +35 TO
SECTION C,
•
EMERGENCY REPAIR OF RIVERBANK ON EAST MARGINAL WAY SOUTH
Shoreline Permit exemption, File #L94 -0031
This .exemption has been approved subject to the following
conditions:
1. All emergency exemptions are subject to revocation,
suspension or revision if additional information indicates
that the project does not constitute an emergency.
2. Equipment
management
vegetation
3.. To reduce
scheduled
and construction methods shall use best
practices to ensure protection of existing
in the project area.
erosion, work on the toe of the bank shall be
for low flows /low tide.
4. A silt loam topsoil shall be used as fill material in the
vegetated geogrid portion, to provide adequate nutrients
and moisture retention.
5. Vegetation and live cuttings shall consist of native,
locally- collected species (e.g. willow, red osier dogwood,
alder, etc.), to ensure acclimatization and compatibility
with the local environment.
6. Planting of the live cuttings shall be accomplished within
24 hours of harvesting to promote sprouting and survival;
and cuttings shall be kept wet and cool.
7. Plantings which do not survive shall be replaced within one
year of failure.
M E M O R A N D U M
TO: Rick Beeler
FROM: Ann Siegenthaler
RE: EMERGENCY REP ,1R OF RIVERBANK ON EAST MARGINAL WAY SOUTH
SEPA Exempt File #L94 -0029; Shoreline Exempt File #L94 -0031
DATE: May 18, 1994
BACKGROUND:
The riverbank along East Marginal Way South at the Boeing Access
Road caved in ca. March 1994. The cave -in has de- stabilized
adjacent portions of the riverbank, and threatens the right -of -way,
a utility pole and fiber optic cable. To pursue immediate repair,
Public Works is requesting an "emergency" exemption from SEPA and
Shoreline permit requirements.
This is similar to the emergency exemption DCD approved last year
for the South 104th street riverbank. Without immediate action by
Public Works, there is a risk of further riverbank sloughing and
damage to infrastructure. Public Works needs an emergency permit
from the Army Corps of Engineers. To obtain that permit, Public
works must demonstrate that they have the Fisheries HPA and
appropriate SEPA• and Shoreline "approvals." The HPA cannot be
issued until SEPA and Shoreline review is complete. The normal
review processes for SEPA and Shoreline permits will prevent timely
remedial action.
EMERGENCY EXEMPTION PROVISIONS:
SEPA allows exemptions for "actions that must be undertaken
immediately•or within a time too short to allow full compliance
with this chapter, to avoid an imminent threat to public health or
safety....or property..." (WAC 197 -11 -880).
Shorelines Mgmt. Act exempts "emergency construction necessary to
protect property from damage by the elements..." or to correct
imminent threat to public health, safety...within a time too short
to allow full compliance...(WAC 173 -14 -040).
SHORELINE AND ENVIRONMENTAL IMPACTS:
The project meets the criteria for SEPA and shorelines exemptions..
It appears to meet the intent of SEPA and shoreline policies. It
EMWS Riverbank repair
5/18/94, Page 2
addresses the major issues, similar to what we have approved on
past riverbank repair projects.
To address habitat issues, the bank will be repaired using
bioengineering techniques: rip -rap below OHWM (Fisheries
requirement), with geogrid matting and live cuttings. The best
"window" for harvesting and planting of live cuttings is past;
therefore, the project will need to be carefully planned and
monitored. As a thorough review is not possible now, we should
specify some conditions.
RECOMMENDATION:
I recommend conditional approval of the two emergency exemptions.
Conditions are based on potential impacts, discussion with Phil and
Gary Schulz' recommendations on the 1993 South 104th bank
stabilization project. Recommended conditions are as follows:
1. All emergency exemptions are subject to revocation,
suspension or revision if additional information indicates
that the project does not constitute an emergency.
2. Equipment and construction methods shall use best
management practices to ensure protection of existing
vegetation in the project area.
3. To reduce erosion, work on the toe of the bank shall be
scheduled for low flows /low tide.
4. A silt loam topsoil shall be used as fill material in the
vegetated geogrid portion, to provide adequate nutrients
and moisture retention.
5. Vegetation and live cuttings shall consist of native,
locally - collected species (e.g. willow, red osier dogwood,
alder, etc.), to ensure acclimatization and compatibility
with the local environment.
6. Planting of the live cuttings shall be accomplished within
24 hours of harvesting to promote sprouting and survival;
and cuttings shall be kept wet and cool.
7. Plantings which do not survive shall be replaced within one
year of failure.
cc: File
Phil Fraser
L94 -0031
10601 E. MARGINAL WY S
CITY OF TUKWILA
SHORLINE
EXEMPTION
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Mw 1 21994
COMMUNITY
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ANN:Noa.�.rptih,r:
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APR 2 0 1994
TUKWILA
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