HomeMy WebLinkAboutSEPA EPIC-36-91 - CITY OF TUKWILA / PUBLIC WORKS - 4233 SOUTH 150TH STREET RAVINE (ROWE RESIDENCE)MRS. ROWE'S SOUTH 150T"
STREET RAVINE
STABILIZE STREAM BANKS,
RE- DIRECT WATERCOURSE &
CREATE BASIN
4233 SOUTH 150T" STREET
EPIC 36 -91
TO:
FROM:
DATE:
MEMORANDUM
Ron Cameron, City Engineer - Public Works
Jack Pace, Senior Planner - DCD Planning
Gary Schulz, Urban Environmentalist - DCD Planning
December 3, 1991
SUBJECT: SEPA Conditions for a MDNS on Rowe's S. 150th Street
Ravine (EPIC- 36 -91).
A MDNS was issued on October 16, 1991 for performing emergency work
in Gilliam Creek to stabilize stream flows and related erosion. -In
accordance with the City's Sensitive Areas Ordinance, specific
conditions of the SEPA determination were required. The initial
stilling basin design was revised and erosion control measures
provided; however, one condition ( #2), has not been completed and
is listed below. The MDNS including all conditions are attached to
this memo for reference.
2) Riparian Vegetation Replacement - Increase the planting
replacement area to 15 square yards (1.5:1.0 ratio) by adding
additional top soil material to east stream bank and, if
possible, add plantings along the top of the west bank. Shrub
plantings would add stability to the Rowe Property west bank.
Hazelnut (Corylus cornuta) would also be acceptable for this
top -of -bank planting.
I think it may be possible to plant woody shrubs on the stream
banks prior to any extreme cold weather. The required planting
should be completed as soon as possible using three or four species
for habitat improvement and plant establishment. You must comply
with the SEPA conditions, or request a modification to those
conditions. Please respond by 12/10/91 with a plant list and
planting schedule. I also need another copy of the revised
stilling basin plan. Let me know if you have questions or I can
assist with the completion of this project.
cc: Phil Fraser, Senior Engineer - Public Works
Doug Dippel, Student Intern - Public Works
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CITY F TUKWILA
DEPARTMENT OF WMMUNITY DEVELOPMENT
FAX NUMBER: (206) 431 -3665
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DEPARTMENT OF COMMUNITY DEVELOPMENT
6300 Southcenter Boulevard, Tukwila WA 98188 G 06„5/90
Office: (206) 431 -3670
WAC 197 -11 -970
MITIGATED
DETERMINATION OF NONSIGNIFICANCE
Description of Proposal 1) To stabilize stream banks with rip rap, 2) Re- direct
watercourse to avoid future bank erosion, and 331 Create a stilling basin to
reduce downstream erosion.
Proponent City of Tukwila - Public Works Department.
Location of Proposal, including street address, if any South of South 150th Street
Culvert at 4233 South 150th Street, Tukwila, WA 98188.
Lead Agency: City of Tukwila. File No. EPIC -36 -91
The lead agency for this proposal has determined that it 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.
[l There is no comment period for this DNS -- .. 01..04.
This DNS is issued under 197 -11- 340(2). Comments must be submitted by
. The lead agency will not act on this
proposal for 15 days from the date below.
„Responsible Official Rick Beeler
Position /Title Planning Director.
Address
Phone 433 -1846
6200 Southcenter Boulevard, Tukwj1.,: WA.. 98188
Signatur
You may appeal this determination to the City Clerk at City Hall, 6200 Southcenter
Boulevard, Tukwila, WA 98188 no later than 10 days from the above date by written
appeal stating the basis of the appeal for specific factual objections. You may be
required to bear some of the expenses for an appeal.
Copies of the procedures for SEPA appeals are available with the City Clerk and
Planning Department.
FM.DNS
MITIGATED DETERMINATION OF NONSIGNIFICANCE
CONDITIONS
EPIC 36 -91
1. On -site Erosion Control Measures - Because heavy equipment
will be operating within the stream corridor, several hay
bales should be intermittently placed downstream of the
project work site. In addition to work performed during low
stream flows, the hay bales will help reduce the sedimentation
to downstream areas.
2. Riparian vegetation replacement - Increase the planting
replacement area to 15 square yards (1.5:1.0 ratio) by adding
additional top soil material to east stream bank and, if
possible, add plantings along the top of the west bank. Shrub
plantings would add stability to the Rowe property west bank.
Hazelnut (Corvlus cornuta) would also be acceptable for this
top -of -bank planting.
3. Stilling Basin design - Proposed redirection of storm flow and
energy dissipation is necessary for this project's success.
However, the construction of an 8 -foot high riprap barrier
would not be considered a stream enhancement feature for this
public accessible portion of Gilliam At least two
pooling areas with 4 -foot high barriers could be constructed
by excavating existing boulders from the stream bed and
creating some detention of storm flows. These in- stream
boulders should be significant in size or may need to be
anchored below the surface. The intent to re- design this
stilling basin includes reducing the visual impact, the high
flow velocities caused by storm events, and the stream
corridor erosion.
MEMORANDUM
TO: Phil Fraser, Senior Engineer - Public Works
Doug Dippel, Student Intern - Public Works
FROM: Gary Schulz, Urban Environmentalist - DCD Planning
DATE: October 16, 1991
SUBJECT: SEPA Environmental Review and Conditions for a MDNS on
Rowe's S. 150th Street Ravine (EPIC- 36 -91).
Per recent discussions with Public Work's staff this project maybe
considered as an emergency measure to stabilize a portion of the
drainage corridor and prevent slope failure directly south of S.
150th Street. In accordance with the City's Sensitive Areas
Ordinance, specific conditions are listed below. Please review
this memo and let me know if you have questions.
1) On -site Erosion Control Measures - Because heavy equipment
will be operating within the stream corridor, several hay
bales should be intermittently placed downstream of the
project work site. In addition to work performed during low
stream flows, the hay bales will help reduce the sedimentation
to downstream areas.
2) Riparian Vegetation Replacement - Increase the planting
replacement area to 15 square yards (1.5:1.0 ratio) by adding
additional top soil material to east stream bank and, if
possible, add plantings along the top of the west bank. Shrub
plantings would add stability to the Rowe Property west bank.
Hazelnut (Corylus cornuta) would also be acceptable for this
top -of -bank planting.
3
Stilling Basin Design - Proposed redirection of storm flow and
energy dissipation is necessary for this project's success.
However, the construction of an 8 -foot high riprap barrier
would not be considered a stream enhancement feature for this
public accessible portion of Gilliam Creek. At least two
pooling areas with 4 -foot high barriers could be constructed
by excavating existing boulders from the stream bed and
creating some detention of storm flows. These in- stream
boulders should be significant in size or may need to be
anchored below the surface. The intent to re- design this
stilling basin includes reducing the visual impact, the high
flow velocities caused by storm events, and the stream .
corridor erosion.
BACKGROUND FOR MRS. ROWE'S 150 ST RAVINE PROJECT (91 -DR02)
The January 9, 1990 flood caused extensive scouring of the banks
of watercourse 22 -1 at the outflow of the culvert crossing under S
150th St. Riprap was placed in the channel and on the ravine banks to
check the scouring pursuant to Public Works project 90 -DR15. This
work checked further scouring at the culvert outlet but subsequent
stream flows have scoured the west bank approximately 40' downstream.
This erosive action is endangering a large deciduous tree on the banks
of the ravine. To halt scouring at the present problem site and to
prevent further scouring downstream, we propose to:
1. Stabilize the banks of the ravine as required with riprap.
2. Re- establish the watercourse channel to its previous location.
3. Create a stilling basin to reduce downstream erosion.
Furthermore, we are re- establishing the stream profile to match the
outfall of the S 150th St culvert in such a manner that this project
will take us forward toward the additional use of the stream as a
potential fisheries habitat as implied by Project Number 3 in KCM
Cascade View Annexation Drainage Analysis.
JUL 2 6 1991
PLANNING SING DEPT.
•
•
Control No . i 5 �� �� � Epic File No. 3b� PR ,;!_� i'R
Fee $225.00 Receipt No. ?. '
ENVIRONMENTAL CHECKLIST JUL 2 6 1991
7
C4 i Y (A- 1 ukvoLA
A. BACKGROUND PLANNING OFFIT
1. Name of proposed project, if applicable:
Mrs. Rowe's S 150 St Ravine (91 -DR02)
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
Ross Earnst, Ron Cameron, Phil Fraser
4. Date checklist prepared:
7/25/91
5. Agency requesting Checklist:
City of Tukwila
6. Proposed timing or schedule (including phasing, if applicable:
August 1991.
7. Do you have any plans for future additions, expansion or further
activity related to or connected with this proposal?
If yes, explain:
No.
8. List any environmental information you know about that has been
prepared or will be prepared, directly related to this proposal:
1. City of Tukwila Watercourse Rating Data Sheets
2. Cascade View Drainage Analysis
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.
10. List any government approvals or permits that will be needed for
your proposal:
1. City of Tukwila Sensitive Area Ordinance approval
2. Washington State Dept. of Fisheries Hydraulic Project Approval
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 alternatives of your proposal
and should not be summarized here.
Place riprap to:
1. Stabilize banks of ravine
2. Re- establish watercourse channel
3. Create stilling basin to reduce downstream erosion and
scouring, r
�� e u � �lov t o x- 5- 2- k
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 should 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 limit 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.
Located in the SW of NE of Sect 22 T23N R4E.
4233 S. 150th, Tukwila, WA 98188
Please see vicinity map.
13. Does the proposal lie within an area designated on the City's
Comprehensive Land Use Policy Plan Map as environmentally
sensitive?
Yes.
TO BE COMPLETED BY APPLICANT
B. ENVIRONMENTAL ELEMENTS
1. Earth
a. General description of the site circle one):
Flat, Rolling, Hilly, teep Slo e , Mountainous, Other
b. What is the steepest slope on the site (approximate
percent slope)?
400% 7
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:
Clay, sandy silt, gravel, existing riprap.
d. Are there surface indications or history of unstable
soils in the immediate vicinity? If so, describe:
Due to upstream development in areas outside the city limits of the
City of Tukwila and in areas previous to their incorporation into the
City of Tukwila, the runoff rate has increased causing scouring and
erosion of the ravine banks and watercourse channel.
e. Describe the purpose, type and approximate quantities
of any filling or grading purposed. Indicate source of
fill:
100 cubic yards of riprap (source to be determined by qualified low
bidder).
f. Could erosion occur as a result of clearing, construction
or use? If so, generally describe:
Yes. Any work on sloped areas can be a potential cause of erosion.
g. About what percent of the site will be covered with
impervious surfaces after project construction (for
example, asphalt or buildings) ?
75% /QG /vLd. °�� 2�'�S�/ / k9 ,2
h. Proposed measures to reduce or control erosion, or other
Impacts to the earth, if any:
Work will be performed in the driest part of the year and equipment
will be kept off of slopes whenever possible.
776y .Cd es i , r .e.c
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:
Construction equipment exhaust which will be negligible.
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.
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:
Yes, a seasonal watercourse designated 22 -1 by the City of Tukwila
Watercourse Rating Data Sheets.
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 entire project will be within 200 feet of the watercourse
channel 22 -1.
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:
25 cubic yards of streambed material will be dredged from a
depression in the stilling basin (see plans) and used as fill on site
-�- ,00 clkO,'u ya v tlf �
4) Will the proposal require surface water withdrawls 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:
No. yo.,1 ?
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
No.
1) Will ground water be withdrawn, or will water be
discharged to ground water? Give general description,
purpose and approximate quantities, if known:
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 into other waters? If so,
describe:
None.
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:
None.
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
>c shrubs
y. grass
pasture
crop or grain
wet soil plants: cattail, buttercup, bullrush, 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?
10 square yards of shrubs and grasses will be covered with riprap
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:
Place 6 cubic yards of topsoil to rock bank and plant 12 Vine Maples
and 12 Red Osier Dogwoods followed with hydroseeding to revegetate
bank and enhance riparian habitat. The area to be revegetated to be
at least as great as the vegetation covered with rock and is
estimated to be 10 square yards; see Landscape Plan for placement.
Any incidentally distrubed areas will be hydroseeded.
5. Animals fr�`�� he�� �0 11.C►^O 5C'� f°2ss/ ' /j /SJ(r,ye1, coagV`
a. Circle any birds and animals which have been observed on
or near the site or are known to be on or near the site:
Birds: hawk, heron, eagle, Congbirds) other
Mammals: deer, bear, elk, beaver, other
Fish: bass, salmon, trout, herring, shellfish, other
b. List any threatened or endangered species known to be on
or near the site:
None.
c. Is the site part of a migration route? If so, explain:
No.
d. Proposed measures to preserve or enhance wildlife, if any:
Stilling basin will help develop watercourse as a salmonid habitat.
�j {°•Q.,U. '&C„l 11 SCIJk- I�t�rg 4- ctre 4o Q{ 95/012
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.
b. Would your project affect the potential use of solar
energy by adjacent properties? If so, generally describe:
No.
c. What kinds of energy conversation 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.
b. Noise
1) What types of noise exist in the area which may affect
your project (for example: traffic, equipment, operation,
other)?
None.
2) What types and levels of noise would be created by or
associated with the project on a short term basis (for
example: traffic, construction, operation, other)?
Indicate what hours noise would come from the site:
Muffled construction equipment noises from 7:OOAM to 10' OOPM). '
c) Proposed measures to reduce or control noise impacts,
if any:
Noise suppression by mufflers to meet OSHA -WISHA and City of Tukwila
requirements.
8. Land and Shoreline Use
a. What is the current use of the site and adjacent
properties?
Residential.
b. Has the site been used for agriculture? If so, describe:
No.
c. Describe any structures on the site:
None. (,A5'11 ,/'io! / he1e- W/74 1� 5
d. Will any structures be demolished? If so, what?
No.
e. What is the current zoning classification of the site?
R -1 -7.2
f. What is the current comprehensive plan designation of the
site?
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. City of Tukwila designated sensitive area. E//�- €
4/ ‘/ "(; // Crk
i. Approximately how many people would reside or work in
the completed project?
None.
j. Approxmately 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:
None.
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:
None.
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?
Eight feet.
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.
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?
No.
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?
None.
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:
No.
b. Generally describe any landmarks or evidence of historic,
archaeological, scientific, or cultural importance known
to be on or next to the site:
None.
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:
None.
b. Is the site currently served by public transit? If not,
what is the approximate distance to the nearest transit
stop? -
No. tylf/k1 ? ,,Pf /4
c. How many parking spaces would the completed project have?
How many would the project eliminate?
None.
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 any, 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.
16. Utilities
a. Circle utilities currently available at the site:
Electricity, natural gas, water, refuse service,
telephone, sanitary sewer, septic system, other:
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:
None.
C. Signature
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 decis'o
Signature:
Date Submitte
PLEASE CONTINUE TO THE NEXT PAGE
Evaluation for
Agency Use Only
TO BE COMPLETED BY APPLICANT
D. SUPPLEMENTAL SHEET FOR NONPROJECT ACTIONS
(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 the 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.
1. How would the proposal 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:
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 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 habitat, 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?
Proposed measures to avoid or reduce shoreline and land use
impacts area:
How does the proposal conform to the Tukwila Shoreline Master
Plan?
6. How would the proposal be likely to increase demands on
transportation or public services and utilities?
Proposed measures to reduce or respond to such demands(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:
8. Does the proposal conflict with policies of the Tukwila
Comprehensive Land Use Policy Plan? If so, what policies of
the plan?
Proposed measures to avoid or reduce the conflict(s) are:
• •
TO BE COMPLETED BY APPLICANT
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 aforegoing items of the
Environmental Checklist. This information provides a general overall
perspective of the proposed action in context of the environmental
information provided and the submitted plans, documents, supportive
information, studies, etc.
1. What are the objective(s) of the proposal?
To halt loss of private property due to scouring and erosion of
watercourse 22 -1.
2. What are the alternative means of accomplishing these objectives?
1. Do nothing. ? ,/
2. Relocate existing key rocks. . ? C ,. less cLCC� �t ��/I V
3. Construct a partial stilling basin..
4. Construct storm drain main to contain flow.
3. Please compare the alternative means and indicate the preferred
course of action:
Alternatives 1,2 and 3 are unlikely to adequately control scouring.
Alternative 4 in environmentally unacceptable and contrary to the
intent of the City of Tukwila Sensitive Area Ordinance.
The preferred course of action is to proceed with the project as
described herein.
4. Does the proposal conflict with policies of the Tukwila
Comprehensive Land Use Policy Plan? If so, what policies
of the Plan?
No.
Proposed measures to avoid or reduce the conflict(s) are:
None.
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ors, Rowe's 150 St Ravine Project
(91-ROP)
Se view of \ cotto-n of strearnoed
sowing exitinc grace anc riprap
placement,
3 3`Z 6)o
36'culvert
NORTH
First stilling basin barrier (approx. 4' tall)
Existing grade shown as dashcsd line. Second stilling basin barrier
(approx. 4' tall)
5% grade
__________ a
el
,15% grade
/NO
0% grade
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Side view o(' botto
St Ravine Project
Ka
NORTH
' of streo.
-nbed
(§/ i>•c
CD)CI CDx o-
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Existing grade shown as dashed line,
5% grade
,15% grade
,\°
Excavate existing stream bed
to approximate depth of existing
0% grade portion of streo.mbed
and line with riprap to create
stilling basin.
Pile riprap to approximate level
of culvert invert with 1:1 slope
upstream side and 2:1 slope
on downstream side CH:V),
pproximate height =8`,
1
JUL 2 6 1991
CEE� <jr 1Ljr,v
PLANNING DEPT.
0% grade
No change to
Sta 3 cross section
■.,
\_ J
FAST
Excavate to move streambed
approximately 3' to east,
Sta 18
Place riprap to line sides
Excavate to move streambed
approximately 5' to east and
to depth for stilling basin,
Sta 32
Place riprap to line sides and basin
Place riprap
Sta 45
Place rip/ap
Sta 50
■
1
1
No change to
Sta 60 cross section
Sta 60
J
DASHED LINES REPRESENT
EXISTING STREAMBED AND
BANK CROSS SECTION,
SOLID LINES AT STA 18
AND STA 32 REPRESENT
PROPOSED STREAMBED AND
BANK CROSS SECTION.
Stations are in feet
from culvert,
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LANDSCAPE PLA\
Mrs, Rowe's 150 St Ravine Project (91 -DR02)
2' Topographic nap of' existing features
showing location of proposed landscaping,
NORTH
AREA TO BE LANDSCAPED
Approximate Scale
I 1 1 I I
0 . 10' 20' 30' 40'
Contour elevation =2'
Culvert Invert elevation =0'
Stream Flow
Jersey barrier Scouring of' bank is
undermining this tree
150th St,
Mrs, Rot.Ne's 150 St Ravine Pro jE..)ct- (91-DR02)
2' TopoOraphic map of exist-in features
with proposed stilling basin carrier location
shown,
NORTH
Approximate Scale
f
0 10' 20' 30' 40'
--- Culvert Invert elevation
Top of stilling basin barrier location
\--Jersey barrier Scouring of bo.,)!< IS
under!..)ining tree
Describe the general size of the system,
such systems, the number of houses to be
applicable), or the number of animals or
system(s) are expected to serve:
None.
c. Water Runoff (including storm water)
the number of
served (if
humans the
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 into other waters? If so,
describe:
None.
2) Could waste materials enter ground or surface waters?
If so, generally describe:
No.
d. Proposed measures to reduce or control surface,
runoff water impacts, if any:
None.
4. Plants
a. Check or circle
/
deciduous tree:
evergreen tree:
()hrubs
grass
pasture
crop or grain
wet soil plants: cattail, buttercup, bullrush, skunk
cabbage, other
water plants: water lily, eelgrass, milfoil, other
other types of vegetation
ground and
types of vegetation found on the site:
alder, maple, aspen, other
fir, cedar, pine, other
b. What kind and amount of vegetation will be removed or
altered?
l0
O" square yards of shrubs and grasses will be covered with riprap
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:
•
d eed— lstur- bed - erees .
5. Animals
a. Circle any birds and animals which have been observed on
or near the site or are known to be on or near the site:
Birds: hawk, heron, eagle songbirds other
Mammals: deer, bear, elk, beaver, other
Fish: bass, salmon, trout, herring, shellfish, other
,None-
b. List any threatened or endangered species known to be on
or near the site:
None.
c. Is the site part of a migration route? If so, explain:
No.
d. Proposed measures to preserve or enhance wildlife, if any:
Stilling basin will help develop watercourse as a salmonid habitat.
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.
b. Would your project affect the potential use of solar
energy by adjacent properties? If so, generally describe:
No.
c. What kinds of energy conversation 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
yrs. Rowe's 150 St Ravine Project (91 -1R02)
2' Topographic reap of existing features
with proposeo stilling oo.sin carrier location
shown,
NDRTH
Approximate Scale
[ I
1 1
0 10' 20' 30' 40'
Culvert invert elevation
Top of stilling bo.sin bo.rrier I occckioh
Stream now
F-17) rTli Hl\FR
JUL 261991
J
61 .1 ur i umfroLA
PLANNING DEPT.
Jersey barrier Scouring of bank is
undermining this tree
LANDSCAPE PLA\
Mrs. Rowe's 150 St Ravine Project (91 -DR02)
2' Topographic map of' existing features
showing location of' proposed landscaping.
NORTH
AREA TO BE LANDSCAPED
Approximate Scale
1 1 1 1 1
0 10' 20' 30' 40'
Contour elevation =2'
Culvert Invert elevation =0'
Jersey barrier Scouring of bank Is
undermining this tree
0
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