HomeMy WebLinkAboutPermit L93-0046 - CITY OF TUKWILA - SOUTHGATE EROSION CONTROL / ENVIRONMENTAL IMPACT STATEMENT (EIS)l93-0046 southgate creek erosion control sepa
ENVIRONMENTAL IMPACT STATEMENT (EIS)
CITY kk F TUKWILA.
Department of Community Development
FAX TRANS
FAX NUMBER: (206) 431-3665
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IF THIS COMMUNICATION IS NOT
CLEARLY RECEIVED, PLEASE CALL: Gd
DEPARTMENT OF COMMUNITY DEVELOPMENT
6300 Southcenter Boulevard, 71(kwilo..-WA PP 1 RR
Office: (206) 431-3670
STATE OF WASHINGTON
DEPARTMENT OF ECOLOGY
P.O. BOX 47600 • Olympia, Washington 98504 -7600 • (206) 459 -6000
October 14, 1993
Mr. L. Rick Beeler
City of Tukwila
6300 Southcenter Blvd
Tukwila WA 98188
Dear Mr. Beeler:
ENVIRONMENTAL IMPACT STATEMENT
We received a copy of the determination of nonsignificance for
the placement of rock in Southgate Creek to control erosion (L93-
0046). Although there was no comment period, we reviewed the
environmental checklist and have the following concerns.
1. A water quality standards modification will be required from
the Department of Ecology for this project (WAC 173 -201A-
110) .
2. Since the project did not begin in September as planned, it
may be difficult to complete the work during low water flow.
3. In- stream sedimentation is a poor method of sediment
control. Isolation of the work area from flowing water may
be required by the water quality standards modification
and /or the HPA from Wildlife or Fisheries.
4. If rock /fill is to be placed in Southgate Creek, the
applicant shall contact the U.S. Army Corps of Engineers in
Seattle at (206) 764 -3495 regarding additional permit
information.
5. Work in or near the waterway shall be done so as to minimize
turbidity, erosion, and other water quality impacts.
6. The determination of nonsignificance (DNS) was issued under
WAC 197 -11- 340(2), but a 15 -day comment period was not
indicated and conditions were placed on the DNS. A 15 -day
comment period is required if a mitigated DNS is issued.
7. The DNS was also issued under WAC 197 -11 -880, which is the
exemption for emergencies. Is this proposal really an
emergency if the City has time to process a DNS? Emergency
exemptions are 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, to prevent an imminent danger to
public or private property, or to prevent an imminent threat
of serious environmental degradation. If this is true, then
the proposal would be exempt from SEPA compliance.
Mr. L. Rick Beeler
October 14, 1993
Page 2
If you have any questions on Comments
Devitt with the Water Quality Program
questions on Comments 4 and 5, please
the Permit Coordination Unit at (206)
Comments 6 and 7, please call me at (2
M. Vernice Santee
Environmental Review Section
MVS:
93 -7203
cc: Ron Devitt, NWRO
Janet Thompson, NWRO
Tom Luster
1 -3, please call Mr. Ron
at (206) 649 -7028. For
call Mr. Tom Luster with
407 -6918. For questions on
06) 407 -6923.
SEP 30 '93 10:0ERM DEPT FISHERIES
DEPARTMENT OF FISHERIES
HYDRAULIC PROJECT
APPROVAL
R.C.W. 75.20.100
R.C.W. 75.20.103
September 30, 1993
(applicant should refer to this date in all correspondence)
PAGE 1 OF 1 PAGES
P.2
DEPARTMENT OF FISHERIES
General Administration Bldg.
Olyniia, Washington 98504
(206) 753 -6650
'OUST City Tukwila
FIRST 1g co 433 0179)
1 cowTROL00 NURSER
of
2398 -01
19 STREET OR RURAL ROUTE
6300 Southcenter
Blvd., ATTN: Robin Tischmak
7 8 9 09.0003
Tukwila STATE 9 818 82I P •
14 17
!DATER Creek Tuuwam JO River
11 PEProtection
Bank
Debris Removal
13• RTER SECTION
ECTIOM 15
TOWNSHIP RANGE(E•W) COUNTY
23N 04EWM King
TIME LIMITATIONS:
5 THIS PROJECT MAY BEGIN
6 AND
MUST BE COMPLETED BY
November 1, 1993
Immediately __
THIS APPROVAL IS TO BE AVAILABLE ON THE JOB SITE AT ALL TIMES AND 1TSPROVISIONS FOLLOWED LY THE PERMITTEE AND OPERATOR PERFORMING
THE WORIG
ON R1' Es a_TD OT PPROV L
the flowing stream.
the stream. If the debris
will be made unstable by
place.
shall ,not appreciably
They shall
.
•
that will prevent
water.
rock of a sufficient •
water action.
components shall be placed
shall be permitted only
can be confined to the
of this project,
section. This may
within voids between
fast - growing vegetation
stream.
136th Street.
SEE h PMLNT CYK_r.RAI. PROVIS1ON4
1. Equipment shall not enter or operate within
2. Only inorganic debris may be removed from
is embedded to the point that the stream
removing it, the debris shall be left in
3. Bank protection and fish habitat material
reduce normal watercourse capacity or configuration.
be placed at the existing waters edge.
4. Bank sloping shall be accomplished in a manner
the release of overburden material into the
5. Bank protection material shall be angular
size to prevent its being washed away by
6. Bank rotection material and fish habitat
from the bank. Dumping onto the bank face
if the toe is established and the material
bank face.
7. Upon completion of the bank protection portions
steps shall be taken to re- vegetate the armored
be accomplished by selectively placing,soil
the rocks and establishing willow or similar
that will provide shade and cover for the
LOCATION: West of 40th Avenue South and South
lt:52.019
•
SEPA; DNS, City of Tukwila, September 1993
REGIONAL HABITAT MANAGER • ' Joe Robel (206) 902 -2566
PATROL • Tuggle (3)
APPLICANT -.WILDLIFE • READER • PATROL - HAB. MGR. • WRIA
DEPARTMENT OF FISHERIES e C•' ,' l_ + £ DIRECTOR
SEP 30 '93 10:09AM DEPT FISHEPIES P.3
THIS APPR-IAL LS TO BE AVAILABJ ON Ty.E ;1OB SITE AT,
ALL TIMES AND iTS PROVISIONS FQ149WED BY THE
PERIMITTEE AND OPERAt R PERFORMING THE WORK
THE PERSONS) TO WHOM THIS APPROVAL IS ISSUED MAY BE HELD LIABLE FOR ANY
LOSS OR DAMAGE TO FISHLIFE OR FISH HABITAT WHICH RESULTS FROM FAILURE TO
COMPLY WITH THE PROVISIONS OF THIS APPROVAL.
FAILURE TO COMPLY WITH THE PROVISIONS OF THiS,APPROVAL COULD RESULT IN A
('IVI1. 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
BIOLOGICAL OR PHYSICAL INFORMATION INDICATES THE NEED FOR SUCH ACTION. THE
PERMITTEE HAS THE RIGHT PURSUANT TO CHAPTER 34.04 RCW TO APPEAL SUCH
DECISIONS. ALL HYDRAULIC PROJECT APPROVALS ISSUED PURSUANT TO•RCW 75.20.103 MAY
BE MODIFIED BY THE DEPARTMENT OF FISHERIES OR DEPARTMENT OF WILDLIFE DUE TO
CHANGED CONDITIONS AFTER CONSULTATION WITH THE PERMITTEE: PROVIDED HOWEVER,
THAT SUCH MODIFICATIONS SHALE, 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
WII DLIFE CODES. ADDITIONAL AUTHORIZATION FROM OTHER PUBLIC AGENCIES MAY BE
NECESSARY FOR THIS PROJECT.
APPEALS - G[:NNRAL INFORMATION
11: you WISH '1'0 APPi:Ai. DENIAL. OR CONDITIONS OF AN HPA, THERE ARE INFORMAL AND FORMAL APPEAL.
PROCESSES AVAILABLE.
A. INFORMAL APPiiA1.S:
AN INFORMAL. APPEAL (WAC 220- 110.340) CONSISTS OF CONTAC'I1NG THE REGIONAL HABITAT
MANAGER AND DISC:u5SINC; YOUR CONCi:RNS. MOST PROBLEMS ARE RESOLVED AT THIS LEVEL., BUT W
Nc)I'. YOU MAY ELEVATE YOUR CONC:i KNs '1'0 THE CI111 1.1' OF TILE HAiUTA'1' MANAGLME:NT DiVISION IN
OLYMPIA. Tim HABITAT MANAGEMENT DIVISION CHIEF'S DECISION SHALL BE APPROVED OR
DISAPPROVED BY THE OR DESIGNEE. 11 YOU ARE NOT SATISFIED WITH THE RESULTS OF THIS
INFORMAL. APPEAL., A FORMAI. APPEAL. MAY R[: FII.li1).
B. FUKMAI. API'IsAIS:
1) Fuit ALL CIVII. P[±NAI:I'Y APPEALS AND FOR OTHER HPA APPEALS WHICH ARE NOT ASSOCIATED WITH
1121(10A'1'ION OK STOCK-WATERING DIVERSIONS, A WRITTEN APPEAL REQUEST MUST BF. FILED WITH THE
I)I:PAR'I'MIiN'1' 'THAT ISSUED OK 1)I NII 1) T1!11 APPROVAL OR LEVIED THE CiVII. PENALTY YOU ARE
APPEALING (WAC 220. 110.350).
2) FOR APPEALS CW DENIAL. OR CONDITIONS OF AN HPA ASSOCIATED WITH IRRIGATION OR STOCK-
WA I'I•kJNCi DIVERSIONS O'I'LIER THAN C:IVI1. PENALTY APPL {A[ S, A WR[ rfl N APPEAL REOUF.ST MUST BE
FILED wiTii Tat HYDRAULIC: APPEALS BOARD PER WAC 259 -04. THE MAILING ADDRESS OF THE
APPEALS BOARD IS: ENVIRONM1:NTAl. HEARINGS OFFICE, BUILDING Two •RowE Six, LACEY,
WAIIANC ;T'UN 98504: TELEPHONE 206/459.6327.
3) FAILURE 1'O APPEAL. WITHIN 30 DAYS (W '1 UE DATE OP ACTION YOU ARE APPEALING RESULTS IN
1'l)RI +1:1'1'URE 01: ALL APPEAL. moms.
CITY OF TUKWILA
MITIGATED L". TERMINATION OF NONSIGNIF' AI`•ICE (MDN': )
DESCRIPTION OF PROPOSAL:
PLACEMENT OF ROCK, IN _;OUTHGA.TE CREEK TO CONTROL
EROSION. CITY CREW'_, WILL BE PERFORMING THE
CONSTRUCTION.
PROPONENT: CITY OF TUKWILA PUBLIC WORKS
LOCATION OF PROPOSAL, INCLUDING-STREET ADDRESS, IF ANY:
ADE :RE'_ _, :
PARCEL NO:
SEC'TWN:'RNI,: W OF 40 AV 5 S 136 ST
LEAD AGENCY:. CITY OF TUKWILA
FILE NO: L93 -0046
The City has determined that the proposal does not 'have a probable
significant . adverse impact on the environment. An environmental impact
statement (.E1S) is not required under ROW 43. 11c.030(2)(c). This
decision Was tirade after review 07 a completed environmental checklist
and other information on file with the lead agency. This information
is available t.o the puo 1 : c on request. The conditions to this SEPA
De te:'nri.iat lon are attached.
This DNS is issued under 197-11-340(2)
1 ,4
i C 1
L. Rick. Beeler, Responsible Official
City of Tukwila, (206) 431 -3680
6300 'Southcen ter Boulevard
Tukwila, WA. 98133
zi
e
You may appeal this determination to the City Clerk at City Hal l , 600
Southcenter Boulevard, Tukwila, WA 98138 no later, than 10 days from the
above signature date by written appeal stating the basis of the appeal
for spec. if i factual ob7,jertion . You may be required to bear some of
the expenses for an appeal.;:
Copies of the procedures for ':,EPA appeals are available with the City
C1ei'1: and Department of Community' Development.
CITY TUKWILA
CONDITION3
Acdr'r_5:
Applicant: CITY OF TU'i: ..WILA- PUBLIC WORKS Status: ISSUED
Permit No: L93 -0046 Appli ?d: 07/0)'/1993
Type: P -SEPA •DN_:C: Approved: 09/27/ 1993
Location: W OF 40 AV .& S 136 ST
Parcel #:
Zoning:
+.A•4.k44 444'.444 *'4 4444.kk. A 4 .4.444 *'k .44.4*'44 kk.444 4:4*44.444'4* 444 44 44.4444 4 i 4444 4 4 4:4 k.4 4
1. On i to Erosion Control Measures. - Because heavy
rnachiner'y will be operating within the stream corridor,
hay bales and siltation fence will be placed downstream of
work s. i te. In-stream work to be performed during low flows.
S I i t fence should be securer' anchored to withstand '.tream
.,flow and capture loose sediments.
2.,-Ban1. iStabi1,=ation Design - Storm flow energy dissipation
is a necessary element for this project. However, the
construction of the new bane: should provide enhancement
using vegetation with armoring techniques that are less
visible. Design need:, to be compatible. for future public
access and planning.
A 4 -foot high, 1 . 5 : 1.0. sloped r iprap structure along the
norther'n bank toe appears to be adequate to prevent erosion
. to the Ordinary High Water Mark.. This should also exceed the
• height where the interface of ola`, layer and gravelly silt
layer creates a potential failure plane.
3. Bank Stabilization Design - Where the bank height exceeds 6
feet, a 3- to 4-foot bench wi l l be constructed as a planting
zone and to absorb abnormally' high f 1 ows . The bench area
restoration may not be needed for the part of downstreani
segfnc-nt; however, the overall slope of the restored bank
will be at most 2 : 1.
4. Stabilization Materials - The toe structure should have
to 3 -man rock that is keyed into the stream bed. For
building the toe structure there should be sufficient small
rock to f i l l the void_ between the larger rock and prevent
settling. Angular rock is preferred because it interlocks
for more =.tability.
To al low drainage behind the structure and keep soil from
washing out, the bench area should be back.fi 11ed with the
quarry spa i l s or a gravelly material.
5. Construction Access - The existing project segment drawing
depicts the access area too far upstream. It i_. recommended
that the location be downstream at the existing bend. This
is an area where the stream channel is wider and wi 1 l cause
no disturbance to the upper steep slope. Part of the area
where access i:. shown wi 11 not be excavated to protect
existing slope stability. A minimum distance of 15 feet
should be maintained as setback from the steep slope
directly above the stream channel.
6. Restoration Plantings - A planting plan to revegetate the
new bank and lower bench area wi 11 be provided for planting
the restored areas during late October or early November.
TO:
FROM:
DATE:
SUBJECT:
MEMORANDUM
Brian Shelton, Senior Engineer - Public Works
Phil Fraser, Senior Engineer - Public Works
Robin Tischmak, Associate Engineer - Public Works
Gary Schulz, Urban Environmentalist - DCD Planning
September 24, 1993
SEPA Environmental Review and Conditions for a MDNS on
Southgate Creek Erosion Control - #L93 -0046.
Per recent discussions with Public Work's staff and Don Williams,
Parks Director, this project is considered a timely remediation to
stabilize a portion of the drainage corridor before the rainfall
season begins. In addition to controlling the erosion problem, the
stabilization design should provide a natural looking bank as
possible for future public use and park connection.
In accordance with the City's Sensitive Areas Ordinance and SEPA
process review, specific conditions are listed below. I believe we
have discussed and reviewed all the project and design related
conditions contained in this memo. Let me know if you have
questions.
1) On -site Erosion Control Measures - Because heavy equipment
will be operating within the stream corridor, hay bales and
siltation fence will be placed downstream of the work site.
In- stream work to be performed during low flows. Silt fence
should be securely anchored to withstand stream flow and
capture loose sediments.
2) Bank Stabilization Design - Storm flow energy dissipation is
a necessary element for this project. However, the
construction of a new bank area should provide enhancement
using vegetation with armoring techniques that are less
visible. Design needs to be compatible for future public
access and park planning.
A 4 -foot high, 1.5 : 1.0 sloped riprap structure along the
northern bank toe appears to be adequate to prevent erosion to
the Ordinary High Water Mark. This should also exceed the
height where the interface of clay layer and gravelly silt
layer creates a potential failure plane.
Southgate Creek Memorandum
September 24, 1992
Page 2
Where the bank height is at least 6 feet, a 3- to 4 -foot bench
will be constructed as a planting zone and to absorb
abnormally high flows. The bench area restoration may not be
needed for part of the downstream segment; however, the
overall slope of the restored bank will be at most 2 : 1.
3) Stabilization Materials - The toe structure should have 2- to
3 -man rock that is keyed into the stream bed. For building
the toe structure there should be sufficient small rock to
fill the voids between the larger rock and prevent settling.
Angular rock is preferred because it interlocks for more
stability.
To allow drainage behind the structure and keep soil from
washing out, the bench area should be backfilled with the
quarry spalls or a gravelly material.
4) Construction Access - The existing project segment drawing
depicts the access area too far upstream. It is recommended
that the location be downstream at the existing bend. This is
an area where the stream channel is wider and will cause no
disturbance to the upper steep slope. Part of the area where
the access is shown will not be excavated to protect existing
slope stability. A minimum distance of 15 feet should be
maintained as setback from the steep slope directly above the
stream channel.
5) Restoration Plantings - A planting plan to revegetate the new
bank and lower bench area will be provided for planting the
restored areas during late October or early November, 1993.
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e - 6' OUARRY SPALLS
(1' MIN. THICKNESS BEHIND ROCKERY)
TOPSOIL. TYPE A
t' MIN. THICKNESS
SIMILAR TO CITY OF RENTON
ROCKERY DETAIL SHT. 4.4
A
ti •
4' - 6' OUARRY SPALLS
2 MAN
TOE ROCKS
GEO FABRIC
ND WAW SPALLS
NOTE:
SECTION
NTS EXCAVATION LIMIT
1. THE ROCKERY HEIGHTS ARE NOTED ON THE PLAN SHEETS.
2. BASE ROCKS SHOULD BE DROP SEATED INTO RAILROAD BALLAST.
3. ROC SIZES ARE SIMILAR TO CITY OF RENTON ROCKERY DETAIL SHEET 4.4.
u' MIN. THICKNESS BEHIND ROCKERY)
STREAMSIDE
ROCKERY
TOPSOIL. TYPE A
1' MIN. THICKNESS
SIMILAR TO C/TY OF RENTON
ROCKERY DETAIL SHT. 4.4
2'-0'
LIVESTAKE. TYP
STREAM BED
WATER DEPTH
VARIES
3
OUARRY
SPALLS
ti
W
2 MAN
TOE ROCKS
CEO FABRIC
ND WAW SPALLS
NOTE:
1.
2.
J.
SECTION
NTS EXCAVATION LIMIT
THE ROCKERY HEIGHTS ARE NOTED ON THE PLAN SHEETS.
BASE ROCKS SHOULD BE DROP SEATED INTO RAILROAD BALLAST.
ROC•SIZES ARE SIMILAR TO CITY OF RENTON ROCKERY DETAIL SHEET 4.4.
STREAMSIDE
ROCKERY W/ OFFSET
STREAMSIDE
ROCKERY
STREAMSIDE ROCKERY DETAIL
(SHEET C -IT)
Control No. \ ., r.
Epic File No. /y� 3 ---(� D `-�-�C?
Fee $250.00 Receipt No.
ENVIRONMENTAL CHECKLIST
A. BACKGROUND
1. Name of proposed project, if applicable:
Southgate Creek Streambed Erosion Control.
2. Name of applicant: City of Tukwila
3. Address and phone number of applicant and contact person:
6300 Southcenter Blvd., Suite 101, Tukwila, WA 98188; 433 -0179;
Robin Tischmak.
4. Date checklist prepared: 6/30/93
5. Agency requesting checklist: City of Tukwila
6. Proposed timing or schedule (including phasing, if applicable):
Construction is planned for the summer of 1993 to be concluded
by the end of September or early October.
7. Do you have any plans for future additions, expansion, or
further activity related to or connected with this proposal? If
yes, explain.
None known.
8. List any environmental information you know about that has been
prepared, or will be prepared, directly related to this
proposal.
A Hydraulic Project Permit was issued by the State of Washington
in September of 1992 for removal of tires in this same stretch
of creek. A new Hydraulic Project Permit will be needed for
this project from the State.
9. 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 applications are known to be pending.
-1-
10. List any government approvals or permits that will be needed for
your proposal.
A Hydraulic Project Permit will be needed from the State of
Washington after the SEPA determination has been made.
11. 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. Section E requires a
complete description of the objectives and alternates of your
proposal and should not be summarized here.
The scope of this project includes removing the remaining tires
and other debris from the creek and the necessary excavation and
grading to place rocks in the streambed to prevent further
erosion and to slow the velocity of the water in the stream.
Areas disturbed outside of the streambed will be replanted with
riparian vegetation. The length of the project is
approximately 200 to 250 feet of streambed.
12. 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, and section,
township, and range, if known. 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 in the City of Tukwila, west of 40th
Avenue South at approximately South 136th Street.
The project site is in section 15, Township 23 North, Range 4
East, W.M., City of Tukwila, King County Washington.
13. Does the proposal lie within an area designated on the City's
Comprehensive Land Use Policy Plan Map as environmentally
sensitive?
Yes, see B. Environmental Elements, Number 8h.
-2-
TO BE COMPLETED BY APPLICANT
B. ENVIRONMENTAL ELEMENTS
Evaluation for
Agency Use Only
1. Earth
a. General description of the site (circle one): Flat, rolling,
hilly, steep slopes, mountainous, other
The streambed itself has a moderate slope down to the east and
there are steep slopes on either side. A portion of the
abutting property is an old roadway and has a gentle slope.
b. What is the steepest slope on the site (approximate percent
slope)?
The stream banks in some areas exceed 100 %, the proposed project
will not affect the steepest slopes on site.
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.
The soils are generally sandy silts with rocks /gravel present in
the streambed. Clays and silty clays are present below the
surface and have been exposed in parts of the stream bank.
d. Are there surface indications or history of unstable soils in
the immediate vicinity? If so, describe.
Erosion of the streambed and banks is significant during high
flows and is the reason for constructing this project.
e. Describe the purpose, type, and approximate quantities of any
filling or grading proposed. Indicate source of fill.
A portion of the north stream bank will be sloped back for
access and replanted for bank stabilization. Excavation will
be limited to removal of the remaining tires and that necessary
to embed the rocks during installation and is estimated to be
about 150 cubic yards. The only fill material will be the
placement of rocks in the streambed, approximately 150 to 250
square yards. Excavated material will be disposed of off site.
f. Could erosion occur as a result of clearing, construction,or
use? If so, generally describe.
The intent of this project is to slow the erosion of the stream -
bed. Placement of rock will protect the currently exposed and
eroding areas. Some siltation will occur as disturbed areas
fill in to a stable condition.
-3-
al
Evaluation for
Agency Use Only
g. About what percent of the site will be covered with impervious
surfaces after project construction (for example, asphalt or
buildings)?
The site will have no additional impervious surface as a result
of this project. The placement of rocks will be confined to the
streambed.
h. Proposed measures to reduce or control erosion, or other impacts
to the earth, if any:
Erosion will be controlled by installation of rocks at the same
time of excavation or removal of materials. Other disturbed
areas will be revegetated at the completion of the project.
There will be an estimated 72 plants needed to revegetate the
disturbed areas with riparian vegetation. Filter fabric will be
installed over the inlet structure at 40th Avenue South to
remove sediments from the water. Construction will take place
during dry, summer months. Hay bales will be used along the
edge of construction to lessen impacts of sedimentation.
2. Air
a. What types of emissions to the air would result from the
proposal (i.e., dust, automobile odors, industrial wood smoke)
during construction and when the project is completed? If any,
generally describe and give approximate quantities if known.
There will be temporary dust and exhaust emissions during
construction. They will be minor due to the short duration of
the project and small number of construction vehicles needed.
b. Are there any off -site sources of emissions or odor that may
affect your proposal? If so, generally describe.
No
c. Proposed measures to reduce or control emissions or other
impacts to air, if any:
None are anticipated to be necessary.
Evaluation for
Agency Use Only
3. Water
4
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.
Yes. Southgate Creek is identified as a Type 2 watercourse on
the sensitive areas map.
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, work will be in the Southgate Creek streambed. See
question A -11 and the attached plans.
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.
See attached plans for excavation and fill areas. The estimated
amount of fill (rocks from a rockery removal project) is 150 to
250 square yards of streambed surface area. The estimated
amount of excavation material is 150 cubic yards.
Will the proposal require surface water withdrawals or
diversions? Give general description, purpose, and approximate
quantities, if known.
No. The project will be completed during the summer months of
lowest flow.
Does the proposal lie within a 100 -year floodplain? If so, note
location on the site plan.
No.
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.
-5-
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Evaluation for
Agency Use Only
Will ground water be withdrawn, or will water be discharged to
ground water? Give general description, purpose, and
approximate quantities, if known.
No.
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.
N /A.
c. Water Runoff (including storm water):
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 into
other waters? If so, describe.
The source and amount of runoff will not change due to this
project. The drainage will continue to occur in its natural
state.
-6-
Evaluation for
Agency Use Only
Could waste materials enter ground or surface waters? If so,
generally describe.
It is possible that during construction fuel or oil from
construction equipment could enter the water of Southgate Creek.
No possibility exists after completion of the project.
d. Proposed measures to reduce or control surface, ground, and
runoff water impacts, if any:
Workers will be made aware of the potential for water
contamination and be expected to take preventative action. Hay
bales will be placed to absorb sediment and oil potential.
4. Plants
a. Check or circle types of vegetation found on the site:
x deciduous tree: alder, maple, aspen, other
x evergreen tree: fir, cedar, pine, other
x shrubs
x grass
pasture
crop or grain
wet soil plants: cattail, buttercup, bulrush, skunk cabbage,
other (some)
water plants: water lily, eel grass, milfoil, other
other types of vegetation
b. What kind and amount of vegetation will be removed or altered?
Four trees in or near the streambed will need to be removed to
accomodate construction, restore eroded stream bank, and placing
rocks in the streambed. Small amounts of grass and brush on the
stream bank will be disturbed during construction.
c. List threatened or endangered species known to be on or near the
site.
None known.
-7-
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V.
Evaluation for
Agency Use Only
d. Proposed landscaping, use of native plants, or other measures to
preserve or enhance vegetation on the site, if any:
Riparian restoration will include seeding and planting trees and
shrubs. Approximately 72 plants will be needed.
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: hawk, songbirds
mammals: raccoons, squirrels, small rodents
fish:
None known.
b. List any threatened or endangered species known to be on or near
the site.
None known.
c. Is the site part of a migration route? If so, explain.
No.
d. Proposed measures to preserve or enhance wildlife, if any:
Construction is planned for summer months of lowest flows, thus
creating the least amount of sediment in the water possible.
Disturbed areas will be replanted with native vegetation.
Evaluation for
Agency Use Only
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 needed.
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 proposed.
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:
Not applicable.
Evaluation for
Agency Use Only
b. Noise
1) What types of noise exist in the area which may affect your
project (for example: traffic, equipment, operation, other)?
Not applicable.
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.
Noise generated by the construction equipment will occur on a
short term basis during normal working hours of City crews.
3) Proposed measures to reduce or control noise impacts, if
any:
Operation restricted to the hours between 7 a.m. and 7 p.m..
8. Land and Shoreline Use
a. What is the current use of the site and adjacent properties?
The site is currently open space, park property in a mostly
natural environment. An old, unused roadway runs through the
site.
b. Has the site been used for agriculture? If so, describe.
No.
c. Describe any structures on the site.
Some old pavement from the old roadway and a storm drainage
structure are at the site.
IS
Evaluation for
Agency Use Only
d. Will any structures be demolished? If so, what?
No.
e. What is the current zoning classification of the site?
The site is currently zoned Single Family Residential R- 1 -7.2.
f. What is the current comprehensive plan designation of the site?
The comprehensive plan designation for this site is low density
residential.
g. If applicable, what is the current shoreline master program
designation of the site?
Not applicable.
h. Has any part of the site been classified as an "environmentally
sensitive" area? If so, specify.
Yes, Southgate Creek is classified as a Class 2 watercourse and
there are Class 3 steep slopes adjacent to the creek.
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:
None.
1. Proposed measures to ensure the proposal is compatible with
existing and projected land uses and plans, if any:
This project is for maintenance purposes only. No changes are
planned that would affect the current or future land use.
Evaluation for
Agency Use Only
9. Housing
a. Approximately how many units would be provided, if any?
Indicate whether high, middle, or low- income housing?
None
b. Approximately how many units, if any, would be eliminated?
Indicate whether high, middle, or low- income housing.
None
c. Proposed measures to reduce or control housing impacts, if any:
Not applicable
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?
No structures are planned. Streambed and bank areas will be
armored with rock at a grade similar to existing.
b. What views in the immediate vicinity would be altered or
obstructed?
None.
c. Proposed measures to reduce or control aesthetic impacts, if
any:
None.
Evaluation for
Agency Use Only
11. Light and Glare
a. What type of light or glare will the proposal produce? What
time of day would it mainly occur?
None proposed.
b. Could light or glare from the finished project be a safety
hazard or interfere with views?
Not applicable.
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:
None.
12. Recreation
a. What designed and informal recreational opportunities are in the
immediate vicinity?
South Gate park.
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-
Evaluation for
Agency Use Only
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.
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:
None.
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 only access to the site is along an old deteriorating road
that is no longer in use.
b. Is the site currently served by public transit? If not, what is
the approximate distance to the nearest transit stop?
Not applicable.
c. How many parking spaces would the completed project have? How
many would the project eliminate?
Not applicable.
Evaluation for
Agency Use Only
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.
None.
g. Proposed measures to reduce or control transportation impacts,
if any:
None.
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.
b. Proposed measures to reduce or control direct impacts on public
services, if any.
None.
-15-
Evaluation for
Agency Use Only
16.Utilities
a. Circle utilities currently available at the site: electricity,
natural gas, water, refuse service, telephone, sanitary sewer,
septic system, other.
None.
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.
Signature
None.
The above answers are true and complete to the best of my
knowledge. I understand that the lead agency is relying on them
to make its decision.
Signature:
Date Submitted: 6 — 36 - 93
1 E'JtseD QE ' BM rcTGb a - 3 -93 PEIz
6rt '? s ct-k o c.�
PLEASE CONTINUE TO THE NEXT PAGE.
Evaluation for Agency Use Only
E: SUPPLEMENTAL SHEET FOR ALL PROJECT AND NON PROJECT PROPOSALS
The objectives and the alternative means of reaching the
objectives for a proposal will be helpful in reviewing the
foregoing items of the Environmental Checklist.. This information
provides a general overall perspective of the proposed action in
the context of the environmental information provided and the
submitted plans, documents, supportive information, studies,
etc.
1. What are the objectives of the proposal?
Slow the erosion process of the streambed and banks, thus
creating less siltation downstream.
2. What are the alternative means of accomplishing these
objectives?
None, different materials could be used, but the rocks proposed
are available at no cost.
3. Please compare the alternative means and indicate the preferred
'course of action:
The availability of these rocks at no cost make the proposed
alternative the preferred course of action.
4. Does the proposal conflict with policies of the Tukwila
Comprehensive Land Use Policy Plan?
No
Proposed measures to avoid or reduce the conflict(s) are:
None.
C2tJ of Tukwila
SOUTHGATE CREEK
STREAMBED EROSION CONTROL
June 29, 1993
VICINITY
MAP
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City of Tukwila
John W. Rants, Mayor
Department of Community Development Rick Beeler, Director
MEMORANDUM
TO: Don Williams, Recreation Director
Ron Cameron, City Engineer
Ted Freemire, Superintendent, Div. I
FROM: Gary Schulz, Urban Environmentalist - DCD
DATE: June 17, 1993
SUBJECT: Drainage Improvements on Southgate Creek park land.
Yesterday morning, John Howat and myself visited the Southgate
Creek site directly upstream from Southgate Park. As you know, the
on -site drainage problem of the tributary overflowing the catch
basin was repaired as a utility maintenance project. The existing
old roadway next to Southgate Creek provided access for small
equipment. However, the existing road surface is not adequate for
machinery needed to construct Creek improvements, restore bank
failure, and remove additional trash.
The request to add a base of gravel and establish a roadway ramp
from 40th Avenue seems appropriate prior to the initiation of
constructing the actual Creek improvements. There is also a need
to establish a "landing" area where some rock can be stored for the
instream •construction. These preliminary activities may be
administratively permitted because they will not adversely affect
the watercourse or buffer habitat. This is a SEPA question to be
determined by Rick Beeler.
The actual work on the stream bank and within the channel can not
begin prior to SEPA review and determination. A Fisheries'
Hydraulic Project Approval (HPA) will be required for this work and
cannot be issued until SEPA review and conditions are completed.
cc:
Mayor Rants
Rick Beeler
Robin Tisiimak
John Howat
6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431 -3670 • Fax (206) 431 -3665
City of Tukwila
John W. Rants, Mayor
Department of Community Development Rick Beeler, Director
MEMORANDUM
TO: Don Williams, Recreation Director
FROM: Gary Schulz, Urban Environmentalist - DCD
DATE: April 14, 1993
SUBJECT: Drainage Improvements on Southgate Creek park land.
Yesterday afternoon, Robin Tishmak, John Howat, Phil Fraser and
myself visited the Southgate Creek site directly upstream from
Southgate Park. As you know, Public Works has been considering a
drainage improvement that will add rock to the riparian corridor
for stabilization. The erosion caused by removing tires from the
channel bottom has created some downstream sedimentation and
maintenance problems in the storm drainage system.
There is also a drainage problem on the site where a small
tributary to Southgate Creek is currently flowing overland to 42nd
Avenue S. A catch -basin is plugged where the tributary was
intercepted and conveyed to Southgate Creek. This sheetflow
situation will create wetlands on the park property if not
corrected this year.
Since meeting on the site to evaluate the problems and inter-
departmental responsibilities, we are requesting a meeting be held
with your presence and input. Hopefully, both improvement projects
can be initiated simultaneously in the near future. Please contact
me or Public. Works to set a meeting. Thank you!
cc:
Mayor Rants
Rick Beeler
Robin Tishmak
Phil Fraser
John Howat
6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington .98188 • (206) 431 -3670 • Fax (206) 431 -3665
C )
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