HomeMy WebLinkAboutSWP273218(4) 1
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SEPA Environmental Review Application
Strander Boulevard Extension Project
City of Renton
September 2004
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ENVIRONMENTAL CHECKLIST
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1 DEVELOPMENT PLANNING
CITY OF RENTON
1 OCT 1 12004
RECEIVED
3-1
Perl '6Inc.
City of Renton, Development Services Division
Environmental Checklist
A. BACKGROUND
1. Name of proposed project, if applicable:
Strander Boulevard Extension and SW 271h Street Corridor Improvements
2. Name of applicant:
City of Renton
3. Address and phone number of applicant and contact person:
' Robert Lochmiller, Project Manager Richard Rutz and Dan Hansen
City of Renton,Planning/Building/Public Works Department Perteet, Inc.
Renton City Hall, 1055 South Grady Way 2707 Colby Avenue, Suite 900
Renton, WA 98055 Everett,WA 98201
(425)430-7303 (425)252-7700
4. Date checklist prepared:
September 22,2004
5. Agency requesting checklist:
City of Renton
eThe City of Tukwila has agreed that the City of Renton will be the lead agency for the SEPA review
6. Proposed timing or schedule(including phasing, if applicable):
The project's timing is dependent on several factors, including funding. However,the projected sequence of
events is to construct the project in three phases or stages(see figs. 1 -3 ). The first phase/stage would construct
a segment starting from the base of the approach to the roadway overpass and continuing east to Oakesdale
Ave. SW in a period of about six months in 2005;construction of phase/stage 2,the SW 271h St.segment from
Oakesdale Ave.SW to East Valley Road,would occur in a period of about a year,starting in 2006;and
construction of the Strander Blvd.roadway overpass and railroad realignment(phase/stage 3)would occur
tduring a period of about two years,beginning in 2007.
7. Do you have any plans for future additions, expansion, or further activity related to or connected with this
proposal?If yes,explain.
' The City of Tukwila has investigated transit-oriented development in the Urban Center area near the future
Sound Transit Tukwila Station,which would be facilitated by this project. It also has Capital Improvement
Program(CIP)plans for the Interurban Trail,Phase IV, in the project vicinity. In the future the City of Renton
may consider some land use changes in the area that is accessed by this project.See also question A(9).
Future transportation network improvements that were assumed in the City Traffic Model for 2015 in the
' project study area included a direct access ramp to SR 167, Rainier Ave./East Valley Rd.realignment,and an I-
405/Grady Way collector/distributor project(Talbot Road to Lind Ave.)
' Strander Blvd. Extension and SW 27'"St.Corridor Improvements,SEPA checklist,September 22,2004 2
In coordination with the road project the City of Renton will install a water supply line and a sanitary sewer line
(the size of each of these may be up to 12 inches in diameter)within easements and crossing the road right-of-
way.
' Stormwater facilities for the Phase/Stage 1 road segment may be developed in coordination with facilities for
the property south of the project.See also questions A(9)and B(3)(d).
8. List any environmental information you know about that has been prepared, or will be prepared, directly related
to this proposal.
Discipline studies for this project(May-September 2004).There are 17 reports that provide further discussion
' and details about all elements of this project.
Hydraulics Report for this project(July 2004)
National Environmental Policy Act(NEPA)environmental classification summary,and Categorical Exemption
' Biological Assessment for Endangered Species Act compliance for this project(2004); salmon information and
reports for WRIA 8(Cedar/Sammamish Basin)
Documentation for Section 106 of the National Historic Preservation Act; Public lands and roadways Section
' 4(f)analysis; Wetlands mitigation plan(2004)
East Side Green River Watershed Project Final Plan and Environmental Impact Statement(EIS), Vol. 1. (Sept.
1997)
City of Renton Comprehensive Plan and EIS(2003)and critical areas information
City of Tukwila Comprehensive Plan and EIS and critical areas information
Cedar River Basin and Nonpoint Pollution Action Plan(1995)
Cedar River Basin Current and Future Conditions Report(1993)
Black River Basin Water Quality Management Plan(May 1993)
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.
The Boeing Company intends to make access improvements to property adjacent to this project.The planning
for these improvements may affect the specific timing or details of construction of some of the new road
and stormwater facilities in Phase/Stage 1.See also question A(7).
Sound Transit will be making improvements to its Tukwila Station,which influences the details of track
' realignment at the north end,as well as the improvements to S. Longacres Way.
10. List any governmental approvals or permits that will be needed for your proposal, if known.
Federal Highway Administration—National Environmental Policy Act(NEPA)Environmental Classification
Summary(ECS)and Categorical Exemption
' U.S.Army Corps of Engineers Clean Water Act(CWA)§404 permit
State of Washington Dept. of Ecology CWA §401 Water Quality Certification
State of Washington Dept. of Ecology NPDES(CWA §402)general construction permit
' State of Washington Dept. of Ecology Coastal Zone Management Act Consistency Certification
State of Washington Dept. of Fish and Wildlife Hydraulic Project Approval
City of Renton Shoreline Substantial Development Permit
City of Renton Right of Way Use Permit
City of Renton building and construction permits
City of Tukwila Shoreline Substantial Development Permit(would be necessary if some stormwater were
discharged to the Green River)
City of Tukwila Sensitive Areas review. (The project is in mapped"Seismic Hazard"and"Wetland"sensitive
' areas. If some stormwater were discharged to the Green River, it would also be in the"Watercourse"
sensitive area."Areas that Contain Archaeological Remnants"has not been designated for the project area,
Strander Blvd.Extension and SW 27"St.Corridor Improvements,SEPA checklist,September 22,2004 2
though according to the Cultural Resources Assessment discipline report there is high likelihood of
archaeological resources in the vicinity.)
11. Give a brief, complete description of your proposal, including the proposed uses and the size of the project and
' site.
The purpose of the project is to improve travel speed,reliability,and access in the north Renton/south Tukwila
area. The project would create a cross-valley link between West Valley Highway(SR 181)and Oakesdale Ave.
SW with a single roadway overpass of both a Union Pacific Railroad(UPRR)track and two Burlington
Northern Santa Fe Railroad(BNSF)tracks. From Oakesdale Ave. SW to East Valley Road, SW 27 Street
would be widened and would include pedestrian facilities and landscaping. The project area would be
approximately 100 acres.The five elements of the project would be as follows:
• Relocation of the UPRR Track. The UPRR track, from just north of SW 43`d Street(SE 1801h Street north)
to approximately I-405,would be shifted to the east to parallel the existing two BNSF railroad tracks.A
' new track would be constructed within a new 100-foot right-of-way adjacent to the BNSF right-of-way and
then joined with the existing UPRR track at both ends of the Project Area.
• New roadway construction from West Valley Highway to Oakesdale Ave SW.A new roadway would be
' constructed from the intersection of West Valley Highway(SR 181)and Strander Blvd. to the intersection
of Oakesdale Ave. SW and SW 27`h Street. The roadway alignment would be an extension of Strander
Blvd.and curve to match up with the existing alignment of SW 27`h Street.The railroad crossing would be
accomplished via a single roadway overpass of all three railroad tracks.The roadway overpass would
provide a vertical clearance of 17 feet for vehicles and 23.5 feet for the railroads,and include four travel
lanes together with a sidewalk on one side and a multi-use bicycle and pedestrian path on the other side.
' Improvements to SW 271h Street.The existing section of roadway between Oakesdale Ave. SW and East
Valley Road would be widened from the current four lanes to five lanes, including landscaping strips and
pedestrian/bicycle facilities on each side in most locations,for a total of 90 feet wide from back of sidewalk
to back of sidewalk.
• Modifications to the Interurban Trail. Because the new roadway segment would cut across the Interurban
Trail,an at-grade crossing would be constructed at West Valley Highway,or the trail would be modified to
cross under the roadway overpass structure.
' Modifications to S. Lonpacres Way.The existing railroad bridges over S. Longacres Way are narrow and
have lower vertical clearances than are now required for public roads.The relocation of the Union Pacific
Railroad track would require the construction of a new bridge which would provide the same vertical
clearance.No improvements would be made to the BNSF bridge.
In addition to the selected action for building a roadway overpass of the tracks,two alternatives which would
construct a roadway underpass were also considered,and their effects evaluated in the discipline studies.
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 within the jurisdictions of both the City of Renton and the City of Tukwila in Sections 24
and 25,T 23 North, Range 4E;and Section 30,T 23 North,Range 5E(see Location Map, Figure 1).The
primary Project Study Area is T-shaped, with the"T" lying on its side. It includes the area between the west
side of the Interurban Trail and the east side of the BNSF tracks.
' Strander Blvd.Extension and SW 27`'St.Corridor Improvements,SEPA checklist,September 22,2004 3
B. ENVIRONMENTAL ELEMENTS
1. EARTH
a. General description of the site(circle one) flat rolling,hilly, steep slopes, mountainous,other.
The site is located in the former alluvial plain of the Green River.
b. What is the steepest slope on the site(approximate percent slope?)
Diking embankments, and the banks of Springbrook Creek; otherwise,one to two percent or less
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.
' In general,the subsurface soils encountered along the proposed alignment consist of a varying thickness of
variable fill,estuarine/overbank deposits, and alluvial deposits. The fill material is underlain by about 20 to
' 30 feet of soft and loose, interbedded estuarine/overbank deposits, fine-grained alluvium.(There is a
somewhat continuous peat deposit that is encountered deep within the estuarine/overbank deposits.)
' d. Are there surface indications or history of unstable soils in the immediate vicinity? If so,describe.
The proposed project crosses recent fill and soft and loose deposits that are susceptible to liquefaction and
its associated effects,and the entire project area is within a high liquefaction susceptibility zone.The
' effects of the potentially liquefiable soil beneath the proposed action would likely include reduction of
vertical capacity and a reduction in lateral support/increased lateral soil pressures on the proposed
foundations and ground settlement.
' Current design-level earthquakes could occur during the life of the project,causing liquefaction.The
effects of liquefaction may include decrease of bearing capacity for existing shallow foundations,ground
surface settlement,reduction in lateral and vertical capacity of new deep foundations,cut slope and fill
instability,and lateral deflection of existing utilities. Liquefaction alone could cause large ground
settlement.
' e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source
of fill.
Construction of approximately 5,500 feet of new UPRR track at an elevation similar to that of the existing
BNSF tracks would require the placement of approximately 125,000 cubic yards of earth and gravel for the
new railroad bed;approximately the same amount of track and railroad bed would be removed from the
existing UPRR location.The railroad bed material would be disposed of at an approved location or reused
as a construction fill material.See also question B(7).
The fill volume for the roadway and associated improvements(sidewalk,retaining walls,etc.)would be
1 approximately 6,000 cubic yards.
f. Could erosion occur as a result of clearing,construction,or use? If so,generally describe.
Without mitigation,erosion of exposed cut or fill slopes during construction could cause increased
sediment transport onto other areas of the project, into stormwater drains,and into Springbrook Creek and
wetlands at the outfall locations.
' The project would result in 7.03 acres of total new impervious surfaces in addition to what currently exists
(6.25 acres), for a total of 13.28 acres. Without using mitigation measures,this additional impervious
surface would produce an incremental increase in runoff rates and volumes,which could result in
additional erosion and sediment deposition in the stream channels.See question B(3)(c).
Strander Blvd.Extension and SW 27"St.Corridor Improvements,SEPA checklist,September 22,2004 4
g. About what percent of the site will be covered with impervious surfaces after project construction(for
example,asphalt or buildings)?
' The project would result in 7.03 acres of total new impervious surfaces in addition to what currently exists
(6.25 acres), for a total of 13.28 acres.See question B(3)(c).
h. Proposed measures to reduce or control erosion,or other impacts to the earth, if any:
Nearly all of the potential seismic impacts could be mitigated by proper design and standard construction
procedures. Liquefaction and, in particular, liquefaction-induced settlement may require nonstandard
construction procedures to partially mitigate; however,these procedures,although nonstandard at present,
are not uncommon given current seismic design criteria and earthquake engineering technology.Because of
the depth of loose, soft,and potentially liquefiable soil and anticipated bridge loads,deep,driven pile
' foundations would be required to support the proposed roadway overpass.These deep foundations would
bear in underlying,nonliquefiable,competent soil. Bridge design is proposed to provide open spans to
minimize the use of approach support fills.See fig.4.
' For the construction phase of the project,the mitigation measures include a stormwater pollution
prevention plan(SWPPP)for construction, with facilities designed and constructed to capture pollutants
and sediment-laden runoff prior to discharging to surface waters.The mitigation measures for stormwater
' runoff and stormwater quality treatment are discussed for question B(3)(d).
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 impacts would be short-term and would include the generation of: dust from excavation,
grading and other general construction activities;odors detectible to some people away from the proposed
project site,particularly during paving operations using tar and asphalt;and air pollutants emitted by
engines of heavy trucks and equipment such as generators and compressors.
The proposed project is included in the Regional Transportation Improvement Program 2003-2005,which
' was modeled in 2002. Regional air quality conformity analyses indicate that it meets all federal and state
air quality conformity requirements, including those for both carbon monoxide(CO)and ozone(03).The
design concept and scope of the Strander Blvd.project have not substantially changed since its inclusion in
these transportation plans and the proposed action would not,therefore,worsen the current situation from
' that modeled in the planned action.Thus,the proposed action would conform with the purpose of the
current State Implementation Plan and to all requirements of the federal Clean Air Act and the Washington
State Clean Air Act.Calculated worst-case maximum CO concentrations at all locations examined would
' comply with applicable ambient air quality standards.
b. Are there any off-site sources of emission or odor that may affect your proposal? If so,generally describe.
Traffic data for the air quality analysis included traffic related to planned actions and growth in the area.
c. Proposed measures to reduce or control emissions or other impacts to air, if any:
1 Contractor compliance with regulations requiring the best available control measures to control the
emissions of odor-bearing air contaminants, and requiring reasonable precautions to avoid dust emissions.
I Emissions during construction from engines of heavy trucks and equipment,and resulting air contributions
of pollutants,would be far outweighed by emissions from traffic normally in and around those portions of
the proposed project area near busy roads.
' Strander Blvd. Extension and SW 27'"St.Corridor Improvements,SEPA checklist,September 22,2004 5
Long-term traffic-related emissions from the proposed action are not predicted to cause ambient air quality
concentrations that exceed regulatory standards.Calculated worst-case maximum CO concentrations at all
locations examined would comply with applicable ambient air quality standards. The proposed action is not
likely to adversely affect air quality and also would conform to current air quality rules, and no operational
' impact mitigation measures are proposed.
3. WATER
a. Surface Water:
1) Is there any surface water body on or in the immediate vicinity of the site(including year-round and
seasonal streams, saltwater, lakes,ponds,wetlands)? If yes,describe type and provide names. If
appropriate, state what stream or river it flows into.
The proposed project area is within the Green/Duwamish River watershed, WRIA 49.The major water
bodies near the proposed project area are the Green River and Springbrook Creek(stream number 09-
0005).
The Green River flows south to north,and is located west of the proposed project area along the west
side of the West Valley Highway.The Green River's name changes to the Duwamish River at river
mile 11,where it converges with the Black River. The Duwamish River flows into Elliott Bay in
Seattle.
Springbrook Creek flows south to north and bisects the project area along 27th Street SW between
Oakesdale Ave. SW and Lind Ave. SW.It flows to the Black River Pump Station located near the
intersection of I-405 freeway and the Valley Parkway.The pump station discharges into the
Green/Duwamish River. This pump station has defined pump capacity restrictions,which regulate the
flows in Springbrook Creek.
Other water bodies in or adjacent to the proposed project area include drainage ponds and drainage
ditches,and 29 wetlands that have been delineated in the project area.
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. SW 27`h Street will be widened on either side and across Springbrook Creek, where an earlier
City of Renton project replaced old,undersized arch culverts with a new,greatly enlarged box culvert.
This culvert was sized large enough(per the modeling for the East Side Green River Watershed
Project)to accommodate the future expansion of SW 271h St.,and so will not need to be further
modified.
The only work that might occur below the ordinary high water mark of Springbrook Creek would be
the replacement of the two existing stormwater outfalls.
' Fourteen of the twenty-nine wetlands or their buffer areas may be affected by the proposed project.
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.
Thirteen wetlands may have buffer impacts,and five(four of which are also in the thirteen)may have
wetland impacts, for a total of fourteen affected wetlands.Approximately 2.02 acres of wetland impact
would result from roadway improvements. In addition,3.90 acres of buffer impacts would result.
Wetland impacts from fill placement would result in a decrease of wetland functions and values
performed.
Strander Blvd. Extension and SW 27"St.Corridor Improvements,SEPA checklist,September 22,2004 6
4) Will the proposal require surface water withdrawals or diversions?Give general description,purpose,
and approximate quantities if known.
No.
r5) Does the proposal lie within a 100-year flood plain?If so,note location on the site plan.
Yes, portions of the project area lie within the floodplain. Springbrook Creek,which the project
crosses, is a Federal Emergency Management Agency(FEMA)floodway.
While roadway will be widened at the crossing of Springbrook Creek, no fill will be placed in the
I FEMA floodway,and no additional constriction or impedance of flow in the floodway will result from
this project. The existing culvert will pass the existing and future 100-year flood flows.
However, some construction and associated fill will be placed below the 100-year flood elevation in
the near vicinity of Springbrook Creek. The SW 27th Street crossing of Springbrook Creek was
included as one of the output points for the 1997 hydrologic(Hydrologic Simulation Program—
FORTRAN [HSPF])and hydraulic(Full EQuations [FEQ])modeling for the East Side Green River
Watershed Project.
(Since 1997 the City of Renton has alleviated several flow constraints and conducted additional
analysis as part of a Springbrook Creek Remapping Study. Preliminary modeling results have been
1 prepared,but at present have not completed FEMA review. Accordingly,the findings of the 1997
modeling are at present considered best available information,per Alan Quinn, City of Renton,
personal communication, Sept. 10,2004. Should the remapping study results be approved for use,the
100-year flood elevation and fill volumes described below would need to be recalculated.)
Per the FEQ simulation of the 100-year event,the elevation of the 100-year flood under future
conditions(conveyance)is 19.2 feet above mean sea level,using the North American Vertical Datum
' 1988(NAVD88).Using this 100-year floodplain elevation in the cross-sectional analysis of the
proposed action,the fill within the 100-year floodplain would total approximately 2,430 cubic yards
for future conditions. If unmitigated, floodwater storage capacity would be reduced accordingly.This
would result in some additional backing-up of water in the upstream tributaries and ponding of excess
water,and contribute to a slightly higher flood elevation and frequency in these upstream areas.
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.
The impacts of the project on water quality would essentially be due to roadway use, from the build-up
of pollutants from traffic between storms and the subsequent runoff of pollutants during storm events.
See question 13(3)(c)(2).
b. Ground Water:
1) Will ground water be withdrawn,or will water be discharged to ground water?Give general
description, purpose,and approximate quantities if known.
' Along SW 271h St.,the excavation of stormwater vaults would require the removal of some
groundwater seepage during the construction phase.
2) Describe waste material 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 from this project.
' Strander Blvd. Extension and SW 27"'St.Corridor Improvements,SEPA checklist,September 22,2004 7
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.
The project would result in 7.03 acres of total new impervious surfaces in addition to what currently
exists(6.25 acres), for a total of 13.28 acres.Impervious surfaces are a combination of"pollution-
generating impervious surfaces"(PGIS)(those subject to vehicular traffic, i.e.,roads and driveways)
and"non-pollution-generating impervious surfaces"(sidewalks and other non-drivable impervious
surfaces).
Impervious Surfaces for Existing and Proposed Conditions.
Existing Conditions Proposed Conditions
Total non-PGIS Total Total Imperious Total non-PGIS Total PGIS Total Imperious
(Acres) PGIS Surface (Acres) (Acres) (Acres) Surface(Acres)
(Acres)
0.82 5.43 6.25 2.53+0.82=3.35 4.5+5.43=9.93 7.03+6.25= 13.28
There would be 4.5 acres of new PGIS in addition to what currently exists(5.43 acres), for a total of
9.93 acres.(Non-PGIS surfaces would total 3.35 acres, of which 2.53 acres would be new non-PGIS
1 and 0.82 acre would be currently existing non-PGIS.)Without using mitigation measures,the new
impervious surface would cause an incremental increase in runoff rates and volumes. During
construction,without mitigation measures the frequency and duration of sediment-laden runoff into
wetlands could increase.See also questions 13(l)(g), 13(3)(c)(2),and 13(3)(d).
Runoff from 8.6 acres of PGIS would discharge to Springbrook Creek, either through the detention and
water quality treatment vaults under SW 27'h Street and to the creek via existing outfalls(piping to be
replaced)on either side of the creek,or through detention and water quality treatment ponds on the
property south of Phase/Stage 1,discharging then to the wetland system and ultimately making its way
to the creek.
Runoff from approx. 1.3 acres of PGIS would be directed to a detention and water quality treatment
pond in the vicinity of the railroad tracks,and conveyed from there either to an existing and recently
reconstructed outfall for W. Valley Highway stormwater and thence via an existing outfall to the Green
River,or to a City of Renton wetland area for which the City has identified a need for supplemental
water.
2) Could waste material enter ground or surface waters? If so,generally describe.
The proposed project is located within the boundaries of the South King County Groundwater
Management Area and within an area that is considered highly susceptible to groundwater
' contamination.The City of Renton has designated the area immediately surrounding the proposed
action as a surficial aquifer with"medium susceptibility"to contamination.
The primary source of water contaminants from transportation systems is runoff from impervious
surfaces. Heavy metals are the most commonly cited constituent that is associated with highway
runoff,particularly cadmium, copper, lead,and zinc.The project would result in runoff from approx.
0.6 acre of new PGIS (with 1.4 acres existing, for a total of 2.0 acres of PGIS)that would discharge to
the Green River,and from approx. 3.9 acres of new PGIS(with 4.0 acres existing, for a total of 7.9
acres of PGIS)that would discharge to Springbrook Creek.
Pollution-Generating Impervious Surfaces (PGIS) for Existing and Proposed Conditions.
rExisting Conditions Proposed Conditions
Total PGIS(Acres) Acres Treated Total PGIS(Acres) Acres Treated
' 5.4 0.3 9.9 9.2+0.3=9.5
Strander Blvd. Extension and SW 27'"St.Corridor Improvements,SEPA checklist,September 22,2004 8
The impacts of the project on water quality would essentially be due to roadway use, from the build-up
of pollutants from traffic between storms and the subsequent runoff of pollutants during storm events.
The quality of stormwater runoff is determined by a complex process that is dependent on a large
number of variables(which are discussed in more detail in the surface water discipline report for the
project).
Water quality impacts from road operations are already occurring in the project study area.The
increased traffic volume resulting from the completion of the project would be expected to
incrementally increase water quality impacts in the area from increased pollutant loadings,and from
sediment deposition(see question 13(1)(g)).These impacts would affect Springbrook Creek,the Green
River,and the adjacent wetlands.
d. Proposed measures to reduce or control surface,ground,and runoff water impacts, if any:
The mitigation measures for stormwater runoff and stormwater quality treatment would be developed in
accordance with the standards of the Stormwater Management Manual for Western Washington
(2001)(SMM)for detention design and stormwater quality treatment,and King County's Surface Water
Design Manual(1998)for storm conveyance design.
Permanent facilities and management measures would be employed for the completed and operating
roadway project,and temporary mitigation measures would be used for the construction phase of the
proposed action. Facilities for the Phase/Stage 1 road segment may be developed in coordination with
facilities for the property south of the project.See also questions A(7)and(9).
Detention facilities would be provided to mitigate increased flows from runoff and the corresponding
potential for stream erosion by matching the developed discharge durations peak discharge rates to pre-
developed durations and return periods as per the SMM.
1 Under existing conditions,only 0.3 acre of PGIS(of a total of 5.4 acres)has water quality treatment
facilities. The project will increase the total acreage of PGIS by 4.5 acres(to a total of 9.9 acres),and
increase the treated PGIS by 9.2 acres(for a total of 9.5 acres). Stormwater quality facilities would be
designed to capture and treat runoff.
These facilities would all be designed for"enhanced treatment"(which provides a high rate of removal of
dissolved metals)as well as to meet other treatment objectives using best management practices
(BMPs)(wetpools,biofiltration,and filtration)to remove sediment,petroleum products,and nutrients from
the stormwater.The treatment facility BMPs would use one or more of the following types of systems:
wetponds,wetvaults,constructed wetlands, filter strips,biofiltration swales,sand filters, and media filters.
Where vaults would be used they would be designed as a treatment train of two vaults(a wet vault and then
a sand filter vault)functioning in series,as listed in Table 3.2 of Volume V of the SMM's standards.These
measures are described in more detail in the project's Hydraulic Report(30%plans).
As a result of project construction, a decrease in pollutant loads to the Green River and Springbrook Creek
should be realized in comparison with current conditions due to the addition of the project's water quality
treatment facilities.
For the construction phase of the project,the mitigation measures would include the implementation of the
project's stormwater pollution prevention plan(SWPPP)for construction,with facilities designed and
constructed to capture pollutants and sediment-laden runoff prior to discharging to surface waters.The
structural BMPs and construction management techniques would depend on the construction site
conditions,and would include:
- Temporary mulching or plastic coverings of exposed areas and stockpile locations,with temporary and
permanent seeding of areas not to be covered by impervious surfaces;
- Placement of temporary silt fences,straw wattles,silt traps,and/or sediment trapping ponds/vaults;
Discharge of runoff through grassed/plant buffer areas;and
- Implementation of a SWPPP throughout the duration of construction.
' Strander Blvd.Extension and SW 27"St.Corridor Improvements,SEPA checklist,September 22,2004 9
A conceptual wetlands mitigation plan for the 2.02 acres of unavoidable wetland impacts is included with
this SEPA checklist and permit application submittal; a final mitigation plan would be approved as part of
permit approval. Increased stormwater runoff could also affect the water quality of wetlands;however,
stormwater treatment and detention facilities will minimize these impacts or improve on existing untreated
conditions.
A location(s)will be identified in the Springbrook Creek drainage upstream of the SW 271h St.crossing for
the development of approximately 2,430 cubic yards of compensatory flood storage below 19.2 feet.
4. PLANTS
a. Check or circle types of ve etation found on the site:
r X deciduous tree: alder maple,aspen,other black cottonwood, red-osier and Pacific dogwood,big-
leaf maple
X evergreen tree: fi ce_da pine,other Douglas-fir,western hemlock,western redcedar
X shrubs beaked haze-Tnut,Nootka rose,salmonberry,red elderberry, Pacific and Sitka willow,
1 thimbleberry,red-osier dogwood, Himalayan blackberry
X grass
pasture
crop or grain
X wet soil plants: attai buttercup,bullrush,skunk cabbage,other reed canarygrass
water plants: water ily,eel grass, milfoil, other
X other types of vegetation maintained planter strips with ornamental plantings
b. What kind and amount of vegetation will be removed or altered?
The overall project footprint would encompass approximately 19.49 acres,which would consist of both
developed and undeveloped lands. Approximately 6.21 acres are currently developed(with impervious
surface),while the remaining 13.28 acres are vegetated.
' Of the approximately 13.28 acres that would be cleared,the predominant habitat(5.21 acres)which would
be impacted would be upland terrestrial(agricultural,pasture,and mixed environments).The remaining
habitat types that would be impacted would include 4.42 acres of Westside Riparian—Wetlands habitat,2.32
acres of urban and mixed environments, and 1.33 acres of westside lowlands conifer—hardwood forest.
Embedded within these acreage estimates are the 2.02 acres of impacts on jurisdictional wetlands and 3.90
acres of buffer impacts(see question B(3)(a)(3)).Approximately 7.03 acres of the cleared area would be
covered by the additional impervious surface that would be added by the proposed project.
c. List threatened or endangered species known to be on or near the site.
No threatened or endangered plant species are known to be on or near the site.
d. Proposed landscaping,use of native plants,or other measures to preserve or enhance vegetation on the site,
if any:
Wetland and buffer impacts would be addressed by wetland enhancement and wetland compensation
(wetland creation);see question B(3)(d).The project will include planter strips and landscaping for the
length of the project except where site constraints preclude this.
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 haw hero eagle ongbird other 23 species were observed, including mallard&ruby ducks;
downy woodpec err.; sparrows; wrens;, swallows;chickadees; others
Strander Blvd. Extension and SW 27"'St.Corridor Improvements,SEPA checklist,September 22,2004 10
Mammals: deer,bear,elk,beaver of a eastern cottontail rabbit,Norway rat. Wildlife potentially present
include, , northern raccoon, cbyete,red fox,opossum,deer mouse,house mouse, voles,eastern gray
squirrel, mustelids,bats
Fish: bass, almo trout herring, shellfish, other
Other animal • bullfrog,garter snakes
b. List any threatened or endangered species known to be on or near the site.
' Federally Listed and Candidate Species that May Occur Near the Proposed Project Area.
Common Name Scientific Name Population Segment/Evolutionarily Federal
Significant Unit(ESU) Status
Bald Eagle Haliaeetus Winter Population Threatened
leucocephalus
Bull Trout Coastal-Puget Sound Threatened
Salvelinus contluentus
Chinook Salmon Oncorhynchus Puget Sound ESU Threatened
tshawytscha
Coho Salmon Oncorhynchus kisutch Puget Sound/Strait of Georgia ESU Candidate
Bald Eagle. Wintering bald eagles may occur in the project vicinity. The data of the Wash. Dept.of Fish
and Wildlife(WDFW)did not include any bald eagle nesting territories,wintering roost,or other bald
eagle use polygons in the vicinity of the study area. However, bald eagles are known to occasionally fly
over the study area and perch on larger trees,where they could potentially feed on carrion,salmonids,
waterfowl,and eastern cottontail rabbits.Bald eagles have also been known to prey on great blue herons at
the Black River Pump Station colony.
Bull Trout.The occurrence of a reproducing population of bull trout in the Green/Duwamish River basin has not
been documented,and the current status of bull trout in this basin is uncertain.Recent surveys conducted
upstream of the Howard Hanson Dam have not captured any bull trout.Assuming a bull trout population was
historically established in the Green/Duwamish River basin,it appears to have been extirpated as a result of dam
and water diversion construction projects during the early 1900s.But while no evidence of a reproducing
population of bull trout exists,individual bull trout are occasionally captured in the Green/Duwamish River
basin;the most recent bull trout captured in the Green/Duwamish River was on May 24, 1994.Although it is
uncertain if bull trout reproduce in the Green/Duwamish River basin,it appears they are opportunistic
anadromous char that occasionally utilize the river during periods of juvenile salmonid outmigration when prey
is most abundant.The WDFW has not documented bull trout in Springbrook Creek,and habitat conditions
in the creek are considered unfavorable for bull trout primarily due to elevated stream temperature,high
percentage of fines in available gravels,and overall low elevation of its headwaters.
Chinook Salmon.The Green/Duwamish River basin Chinook salmon is considered a composite stock with
contributions from both hatchery and natural(wild)production. Muckleshoot Indian Tribe data indicate
young-of-the-year(YOY)Chinook salmon smolts start entering the Duwamish estuary by March 24 and
are present through late August,with a peak in mid May(Warner and Fritz 1995).An influx of hatchery
fish occurs in late April and early May.Chinook salmon in the estuary are composed of yearlings,YOY,
and fry.The presence of yearling Chinook in the estuary may be the result of hatchery practices,while the
presence of fry may be the result of spring freshets. Furthermore, small yearlings captured in February,
March,and April are from fish planting that occur above the Howard Hanson Dam that are typically
flushed downstream when the reservoir is drained in November and December.
Chinook salmon have been documented in Springbrook Creek and observed(1997)attempting to spawn
near the SW 271h St.crossing over Springbrook Creek.No data for juvenile outmigration are available for
Springbrook Creek because none have been captured at the BRPS,thus indicating they may not
successfully spawn in this system. WDFW spawning ground survey data for Springbrook and Garrison
creeks documented 12 salmon,one of which was a Chinook.No other Chinook salmon were observed
during these surveys,and no redds of any species were documented.The conclusion is that most if not all
Chinook salmon entering Springbrook Creek are fish migrating to the Green River Hatchery that strayed
Strander Blvd.Extension and SW 27"St.Corridor Improvements,SEPA checklist,September 22,2004 11
into the Springbrook Creek basin,and that habitat in Springbrook Creek is not well-suited for Chinook
salmon and few or no Chinook salmon rear in this system.
Coho Salmon.Coho salmon typically spawn in most if not all accessible tributaries with suitable habitat in
the Green/Duwamish River basin,and spawning also occurs in the mainstem. Based on the extended
freshwater rearing of juvenile coho salmon,they could be present throughout the year where suitable
habitat exists.
1 Four adult coho salmon were observed in the Springbrook Creek basin. All were located in the lower
foothill area of Mill Creek;no redds were found.A coho salmon smolt outmigration study conducted at the
BRPS during the spring of 1994 documented smolts leaving Springbrook Creek in April 8 through June.
WDFW spawning ground survey data for Springbrook and Garrison creeks documented 11 coho(of the 12
salmon observed).No redds were documented.
c. Is the site part of a migration route?If so,explain
The area is part of the Pacific Flyway. Anadromous fish migrate to upstream spawning sites via the Green
River.
d. Proposed measures to preserve or enhance wildlife, if any:
The project area and vicinity are highly urbanized and modified,and as such have absorbed extensive
impacts to wildlife species and their habitats in the past. The proposed project would result in additional
impacts on terrestrial resources from direct impacts and as a result of facilitating the development of and
access to the area.
Habitat Loss, Fragmentation and Alteration; Displacement. Wildlife habitat in the study area is currently
fragmented,but proposed project-related activities would reduce and further fragment what currently
remains. In general,fragmentation reduces the number of species(species diversity)that occur in the
remaining habitat patches,and shifts species use to favor those species which are adapted to habitat edges,
dependent upon human activity,or highly mobile. Some wildlife would be displaced during construction
when land is cleared of existing vegetation and noise and activity increase in the proposed project area;this
displacement could be either temporary or permanent and could result in mortality. Species and habitat
affected would depend in part on the types and quantity of habitat impacted, construction timing,and the
availability of suitable unoccupied habitat in the vicinity.
Direct Mortality;Construction Effects; Disturbance. During construction, some direct mortality to wildlife
would occur during construction as a result of the clearing of 13.28 acres of vegetated land. Increases in
traffic volumes and speeds in the project area due to the project would result in additional automobile-
caused wildlife kills. Human access to wildlife areas,and the level of noise and activity,may increase,thus
inhibiting wetland use by some wildlife species.Clearing and grading could result in increased temperature
and sedimentation/turbidity effects.
There will not be any direct mortality of fisheries resources because the only work that might occur below
the ordinary high water mark of Springbrook Creek would be the replacement of the two existing
stormwater outfalls. The project's erosion control and pollution prevention planning will protect the waters
during this work.
Mitigation for project impacts to wetlands would be based on wetland type and the mitigation ratios of the
local jurisdiction.See question B(3)(d). Riparian habitat adjacent to Springbrook Creek along SW 27th
Street may be affected: the extent of impact and mitigation would be quantified and finalized during the
permitting process.Clearing of vegetated areas where nesting migratory birds could be present should not
occur during the nesting season(i.e.,vegetated areas should be cleared and grubbed by early April).A
nesting raptor survey should be conducted to identify existing nests and potential nesting trees in the
project corridor in order to enable corrective actions to be taken prior to construction if raptors nest within
the project footprint.
Strander Blvd.Extension and SW 27"St.Corridor Improvements,SEPA checklist,September 22,2004 12
Another mitigation measure could be to convert to upland wildlife habitat the area of railroad bed that
would be abandoned as a result track relocation.Native trees and shrubs,snags,and downed wood could
possibly be installed along the old track location.
1 Increased Stormwater Runoff, and Water Quality Effects.The quantity and quality of stormwater runoff
would change as a result of an increase in new impervious surface in the study area.Aquatic habitats such
as streams and wetlands that become receiving waters for stormwater runoff could experience a change in
their hydrograph,could receive increased pollutants such as hydrocarbons,metals, fine sediment,and
1 others, and could experience increased water temperatures.
Increases in sediment loads and turbidity in aquatic systems can be minimized through the use of
stormwater treatment and detention facilities and BMPs.These would minimize the impacts to water
quality,and the effects of runoff volumes,peak flows,and alterations to hydroperiod. Pollutant impacts can
be reduced through the use of enhanced water quality treatment measures and precautionary measures
during construction. Temperature impacts can be reduced through the use of best management practices
(BMPs)such as underground detention facilities, infiltration of runoff, and replacement of vegetation.See
also question B(3)(d).
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.
Gasoline,and diesel fuels and/or liquefied petroleum gas,would be used by worker vehicles and
construction vehicles and machinery.
lb. 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:
The following project practices would be employed:
Carpooling or vanpooling of construction workers to and from the work site would be encouraged;
Equipment would be regularly maintained to ensure that it remained in good condition;
Idle equipment would be throttled-down or switched-off;
Double-handling of fill and construction materials would be minimized;and
Recycled materials would be used, and materials generated during construction would be recycled.
By reducing congestion at intersections in the proposed project area,the proposed project would have the
benefit of improving the efficiency of petroleum consumption by vehicles.
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.
Six sites within the proposed project area have had or may have had releases of hazardous chemicals to soil
and groundwater.One of these sites is the Conoco Phillips Tank Farm, which has had two reported fuel
releases and is undergoing site cleanup of free-product in groundwater.Contaminated groundwater extends
into SW 27th Street,where excavation work is planned. In addition,there are numerous other sites
identified in the extended project area that may also have contributed to soil and groundwater
contamination.These potential or real releases could be encountered during construction. In addition,the
railroad ties and beds may be contaminated with railroad tie preservatives such as cresote or other
contaminants from possible spills or releases along the railroad.
Strander Blvd.Extension and SW 27"St.Corridor Improvements,SEPA checklist,September 22,2004 13
The Conoco Phillips Tank Farm,2423 Lind Ave. SW, is under an Ecology Consent Order,No. DE 87-
N301. Stemoff Metals Corporation, 1600 SW 43rd St, is undergoing a MTCA Cleanup Action with
Ecology. Daniel Boone Paint Co., 15701 Nelson Place S.,and Olympic Pipeline HQ/PSE Renton
Substation,2319 Lind Ave. SW,are undergoing Voluntary Cleanup Actions under MTCA with Ecology. In
addition, the Renton Sand and Gravel and Renton Junction Landfill sites are undergoing an Ecology Site
Hazard Identification Lastly,there are three former Leaking Underground Storage Tank sites in the
proposed project area.The hazardous waste discipline report describes how the project could affect each of
this environmental commitments.
1) Describe special emergency services that might be required.
Implementation of spill response measures. Treatment of workers if exposed to hazardous chemicals
beyond regulated limits. Handling of previously unidentified and potentially hazardous substances
(such as in the discovery of a previously unknown underground tank).
1 2) Proposed measures to reduce or control environmental health hazards, if any:
There are a number of potential sources of contamination near the proposed project.One site in
particular,Conoco Phillips tank farm(located on the corner of SW 27th Street and Lind Ave. SW),
may need additional cleanup prior to construction depending on the results on additional testing.
It is recommended that soils and groundwater be characterized for contaminants prior to
commencement of project construction:the early sampling and characterization would allow time for
consideration of redesign elements or planning for construction staging if the results indicate that such
alterations would be desirable in order to avoid problems with worker health and safety and with
disposal of potentially hazardous waste.
A site-specific health and safety plan would be developed for construction workers to address each
type of chemical that is expected to be encountered in soil,groundwater,and the railroad ties.
If it should be determined that soil or groundwater waste would be classified as a hazardous waste,
then a Waste Characterization Plan would be developed that would identify procedures to effectively
' manage waste generated during construction so that delays could be kept to a minimum and adherence
with all regulations could be assured.
b. Noise
1) What types of noise exist in the area which may affect your project (for example: traffic, equipment,
operation,other)?
Traffic,construction equipment,material hauling,and grading could affect traffic flow in the proposed
project area.
2) What types and levels of noise would be created by or associated with the project on a short-term or a
long-term basis (for example: traffic, construction, operation, other)? Indicate what hours noise would
come from the site.
Clearing,grading,paving,erection and similar site preparation and construction activities would
generate noise during the construction phase,normally during regular business hours but potentially at
I other times.Vehicular traffic would generate noise long-term as a result of the project.
3) Proposed measures to reduce or control noise impacts, if any:
There are no residential uses within the project vicinity that are likely to be affected by construction-
related noise(The nearest residential uses to the proposed action construction corridor are
approximately 1,400 feet east of the eastern terminus,on the opposite side of SR 167.Construction
sound levels at that distance are greatly reduced.). However,some commercial locations at the western
and eastern termini of the proposed action corridor could be affected by the nearest construction
Strander Blvd. Extension and SW 21"St,Corridor Improvements,SEPA checklist,September 22,2004 14
activities.Noise emanating from temporary construction sites is exempted except during nighttime
hours(Le., between 10 p.m.and 7 a.m.). If nighttime construction is deemed necessary, a nighttime
noise variance might be required.
The proposed project is included in the Regional Transportation Improvement Program 2003-2005,
which was modeled in 2002.Traffic data for the noise analysis included traffic related to planned
actions and growth in the area. The design concept and scope of the Strander Blvd. project have not
substantially changed since its inclusion in these transportation plans and the proposed action would
not,therefore,worsen the current situation from that modeled in the planned action. The projected
increases in long-term noise for the commercial locations at the western and eastern termini of the
proposed action corridor would not be substantial.
Potential traffic noise impacts to users of the Interurban Trail could occur at locations on the trail in the
vicinity of Strander Blvd.and West Valley Highway. However, access and visibility requirements for
the commercial businesses fronting West Valley Highway would preclude the construction of a noise
barrier,so that such a barrier would not be feasible.
8. LAND AND SHORELINE USE
a. What is the current use of the site and adjacent properties?
In Renton,commercial and light industrial land uses are located along the proposed project corridor, in
particular on the north side of SW 271h St. and near its intersection with East Valley Road. A large portion
of the land south of SW 271h St.and the proposed Strander Blvd.extension are undeveloped and depicted as
Resource Conservation on the Renton zoning map.There are no residential or recreational land uses near
the proposed project area within Renton City limits.
In Tukwilla, land uses surrounding the intersection of West Valley Highway and Strander Blvd.and north
up to I-405,consist of commercial uses catered to the traveling public, including restaurants,gas stations,
and convenience stores. South of that intersection the land uses,while still containing commercial uses,are
more light-industrial commercial uses such as manufacturing. There are no residential land uses near the
proposed project area within the Tukwila city limits.A short portion of the Interurban Trail, a recreational
use, is located near the western terminus of the proposed project and would likely be affected by it.
b. Has the site been used for agriculture? If so,describe.
�1 Prior to the late 1950s and '60s the Green River valley was farmed where the effects of seasonal flooding
and channel shifting were limited enough to allow this.
c. Describe any structures on the site.
Three railroad lines,roadways and bridges.Commercial and light industrial buildings are adjacent to the
project in many locations.
d. Will any structures be demolished? If so,what?
5,500 feet of UPRR railroad track would be relocated.A gas station at the west terminus of the project
corridor would be relocated.A new UPRR bridge structure would be built at the existing railroad crossing
at S. Longacres Way. Some existing pavement areas would be reconstructed.
e. What is the current zoning classification of the site?
City of Renton. Five different zoning designations are within the proposed project area.From the western
city limit eastward to the intersection of Oakesdale Ave. SW and SW 271h St.,the property is zoned
Commercial Office(CO). Proceeding eastward along the north side of SW 27`h St.to Lind Ave. SW,the
property is zoned Industrial—Heavy(IH).Along the same segment on the south side of SW 271h St.,the
Lproperty(owned by the City of Renton) is zoned Resource Conservation(RC).On the north side of SW
Strander Blvd. Extension and SW 27"St.Corridor Improvements,SEPA checklist,September 22,2004 15
271h St. from Lind Ave. SW to East Valley Road,the property is zoned Industrial—Light(IL). Along the
same segment on the south side of SW 27`h St.,the property is designated as Industrial—Medium(IM).
City of Tukwila. The roadway portion of the proposed project would consist of an east-west link from the
intersection of Strander Boulevard and West Valley Highway to the eastern city limit boundary.The
proposed roadway extension and north portions of the UPRR railroad track realignment are located in the
Tukwila Urban Center as defined in the Comprehensive Plan.The southern portion of the proposed north-
south railroad track relocation extends south to a point approximately 1,700 feet from Strander Blvd. and is
designated Commercial Light Industrial.
f. What is the current comprehensive plan designation of the site?
City of Renton. The proposed project area is located within the"Employment Area—Valley"land use
designation of the Comprehensive Plan.
City of Tukwila.The Comprehensive Plan applies the Tukwila Urban Center and Commercial Light
Industrial land use designations.The Tukwila Urban Center is an area characterized by high-density
regional uses that include commercial uses,offices, light industry,warehousing,and retail uses.
g. If applicable,what is the current shoreline master program designation of the site?
City of Renton:
Springbrook Creek is a FEMA floodway. It flows south to north and bisects the project area along 27th
Street SW between Oakesdale Ave. SW and Lind Ave. SW. It flows to the Black River Pump Station
located near the intersection of I-405 freeway and the Valley Parkway. The pump station discharges into
the Green/Duwamish River.This pump station has defined pump capacity restrictions,which regulate the
flows in Springbrook Creek. The ordinary high water mark is 15.0 feet above mean sea level.
Urban environment designation is applied to the west bank of Springbrook Creek north of SW 271h St.
Conservancy is applied to the east bank north of SW 27`h St.,to both sides of the creek south of SW 27`h
St.,and to the associated wetlands located on the south side of SW 271h St. from Springbrook Creek west to
Oakesdale Ave. SW.
City of Tukwila:
If the project were to direct outflow from some detention ponds to the Green River, it would involve the
construction of a line and connection to an existing outfall. Some of the line construction,and the
connection with the existing system and outfall,would occur within 200 feet of the Green River.
The Urban environment designation is applied to Green River.
h. Has any part of the site been classified as an"environmentally sensitive"area? If so,specify.
City of Renton:
Flood Hazard Area.The City of Renton has designated the FEMA-mapped 100-year floodplain and
floodway as its flood hazard area.The project crosses the floodway at Springbrook Creek,and has
construction and fill activities in some of the adjacent floodplain.See also question B(3)(a)(5).
Geologic Hazard. Seismic Hazard Area. The City of Renton has designated the area immediately
surrounding the proposed project as a`high hazard"area.
Habitat Conservation. Critical Habitat.This includes shoreline areas designated as Conservancy or
Natural. In the project area,Conservancy is applied to the east bank of Springbrook Creek on both
sides of SW 271h St.,to the west bank on the south side of SW 271h St.,and to the associated wetlands
on the south side of SW 27'h St. from Springbrook Creek west to Oakesdale Ave. SW.
Strander Blvd. Extension and SW 27"'St.Corridor Improvements,SEPA checklist,September 22,2004 16
' Wetlands. Twenty-nine wetlands have been delineated in the project area.Of the eighteen that may be
affected by the proposed project,nine are in Renton.
Shoreline Streams and Lakes. This sensitive area has not been defined or mapped for the Renton
' Municipal Code. However,the project has construction within the shoreline jurisdiction of
Springbrook Creek.
City of Tukwila:
Geologic Hazard. Seismic Hazard Area. The City of Tukwila has designated the area immediately
surrounding the proposed project as a hazard area.
tWetlands.Twenty-nine wetlands have been delineated in the project area.Of the eighteen that may be
affected by the proposed project,nine are in Tukwila.
' Areas that Contain Archaeoloeical Remnants. This is not currently designated for the project area,but
according to research for the project(see question B(13)and the Cultural Resources Assessment
discipline report),there is high likelihood of archaeological resources in the vicinity.
' Watercourses. If the project were to direct outflow from some detention ponds to the Green River, it
would involve this sensitive area.
' i. Approximately how many people would reside or work in the completed project?
No one resides within the project area,and the project itself would not provide any new long-term
employment.
By facilitating access into and across the area,the project would be expected to indirectly facilitate an
earlier and more intense commercial use and development of the area.
j. Approximately how many people would the completed project displace?
' None.
k. Proposed measures to avoid or reduce displacement impacts, if any:
Does not apply.
1. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if
any:
City of Renton Planning.The proposed project is listed in the Renton Arterial Plan in the Transportation
Element of the Comprehensive Plan,from SR 181 (West Valley Highway)easterly to Oakesdale Avenue
' SW,though the listed project does not include the section from Oakesdale Ave. SW to East Valley Road. It
does,however, include the area where any new right-of-way would be required.New construction in the
portion that is not included in the listing,along SW 271h St.,would be within the existing right-of-way.
' City of Tukwila Planning. The proposed project is included in the City's capital improvements program.
Consistent with the objectives for the Tukwila Urban Center the new arterial would promote transportation
and transit services that would help to increase and improve access to and from the Urban Center for all
transportation modes and allow a range of travel route choices.
Construction Phase.The magnitude of impacts to various land uses would vary with the timing, intensity,
' and duration of the disturbance.Temporary impacts would vary from location to location and result in
traffic detours and an increase in noise,dust, and traffic congestion during construction.During
construction,travel times would increase for business patrons in the proposed project area.Businesses
would most likely see access limitations due to construction activity within the ROW. Project measures to
' address these elements are discussed in the appropriate sections of this checklist.
' Strander Blvd.Extension and SW 27'"St.Corridor Improvements,SEPA checklist,September 22,2004 17
The cities are committed to ensuring continued access through the proposed project area during
construction,where feasible,and to ensure that disruption to businesses during construction is minimal; for
example,to avoid street closures during construction,and to maintain one lane of traffic in each direction at
' all times, if possible. Every effort will be made to minimize impacts on merchant's driveways and
sidewalks during construction, especially during business hours. Information would be provided to the
public of transit and pedestrian re-routings, schedules of operation,road closures,and alternative modes of
' transportation as appropriate. Traffic signals and design would be used to help maximize traffic operation
efficiency and improve traffic flow during construction activity.
Lone-term Land Use Impacts. These are related to change of land use, facilitation and intensification of
development.
Some existing land would be converted to transportation land use because additional right-of-way would be
acquired for the proposed action. This is consistent with transportation planning in the City of Renton.
The new access that would be provided by the proposed project may stimulate faster development of vacant
land. While future development is largely dependent on market absorption rates,greater development
1 would likely eventually happen even with the existing arterial network,although the new development
would likely be accelerated by the proposed action. The increased area and intensity of development in the
area is consistent with land use and comprehensive planning for both cities.
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:
' Does not apply.
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.
The roadway overpass of the railroad tracks at Strander Blvd. would be approx. 70 feet tall at its greatest
height.The railroad overpass of S. Longacres Way would be approx. 34 feet tall at its greatest height.
' Structural exteriors would be concrete,asphalt,and painted steel and aluminum.
b. What views in the immediate vicinity would be altered or obstructed?
' Within the proposed project area between West Valley Highway and East Valley Road,the main visual
features include the existing development of warehouse/distribution facilities;the infrastructure features of
railroad tracks,power lines, and streets;and the natural features of the natural tree canopy,planted tree
stands,and low-lying emergent vegetation between the railroad tracks.
The area between West Valley Highway and the proposed Strander Boulevard connection to SW 271h St. is
currently undeveloped,with the major visual features being the power lines;two railroad tracks running
north-south on elevated embankments parallel to the power lines; and the high-rise hotel on the east side of
Strander Blvd. Extension and SW 27'h St.Corridor Improvements,SEPA checklist,September 22,2004 18
West Valley Highway. The vegetation in this area is a combination of columnar poplar trees,thickets of
blackberries,and immature trees and grasses.This area has been developed in the past,and while the
buildings have been removed,the asphalt roadway surfaces remain,creating an open network.
' The area eastward from Oakesdale Ave. SW is a mixture of industrial and distribution facilities or
undeveloped land. The visual environment in this area is either natural vegetation or large unmodulated
buildings and a tank farm characteristic of warehouse/distribution operations where the man-made
' landscaping along the roadway consists of street trees and planting strips.A significant visual feature in this
area is the north-south open space created by Springbrook Creek. The landscaping along SW 27th Street
ends at East Valley Road, where the environment is of mixed uses and mixed qualities.
The construction of the roadway overpass over the railroad tracks would result in a low curved object that
would have a series of arcs above and below the roadway surface.See fig.4. It would be approximately
1,600 feet long and 50 feet at its highest point. The roadway overpass would therefore be taller than the
existing warehouse/distribution buildings in the area,and would be approximately as tall as a four-story
office building(12.5 foot floor-to-floor spacing). This roadway overpass structure and the elevated section
of 1 405 to the north would be the only roadway facilities with high visibility on the valley floor.
' For the most part,even though the roadway overpass structure would be large and elevated, distant views
from the hillside residential areas on either side of the valley would be largely unaffected by construction of
this roadway. The views from these areas are distant,and the proposed action would be a small feature in
the viewshed.
Between West Valley Highway and the UPRR and BNSF railroad tracks,the approach ramp on the west
side of the tracks may touch down to meet the grade of West Valley Highway very near its existing
intersection with Strander Boulevard.Depending on the final grade and design the two existing buildings
(Jack in the Box and Taco Bell)might have to be removed to provide space for the ramp: if so,these two
buildings could be rebuilt with new businesses,although with different building locations.These businesses
and others in the vicinity would have immediate views of the approach ramp.
In the immediate area between the railroad tracks and Oakesdale Avenue SW,there are no viewers of this
facility because the area is undeveloped.The nearest viewer group is that of the hotel users in the high rise
' hotel along West Valley Highway.These guests would have a view of the roadway overpass,although
these guest rooms look easterly and the new roadway overpass would be to the southwest.(A closer view
feature for these guest rooms are the power lines between the hotel and the existing UPRR track.)
' Future development north and south of the proposed project area would be closer to the roadway than are
existing occupied buildings. Future buildings would have immediate views of the approach ramps and the
roadway overpass structure spanning the railroad tracks. From distant views these buildings would obscure
' the view of the roadway overpass and the presence of this structure would be mitigated as these buildings
are eventually developed to the north and south.
The stand of columnar poplar trees that runs east-west in the study area in the segment from West Valley
Highway to Oakesdale Ave. SW would be removed.Views from distant vantages would be most impacted
by this removal.
Running eastward to Oakesdale Ave. SW the new roadway would connect to the existing four-lane SW 271h
Street. Because the middle lane would also provide an opportunity for a planted median,the expanse of
new roadway surface would be limited to two lanes on either side,with the exception of the intersections.
S
' Strander Blvd.Extension and SW 27"St.Corridor Improvements,SEPA checklist,September 22,2004 19
c. Proposed measures to reduce or control aesthetic impacts, if any:
The proposed roadway overpass is currently proposed as a series of open spans which will improve the
aesthetic appearance of the bridge as well as minimize the use of approach support fills.See fig.4.
' Providing color and texture of the surfaces of retaining walls could reduce headlight glare and provide a
less industrial look and feel to the sidewalls.
' At the west end, if the two parcels(Jack in the Box and Taco Bell)north and south of the existing Strander
Boulevard right-of-way became undevelopable because of the need to provide area for the ramp,these
parcels could provide an area to create a landscaped entrance to the approach ramp.
Views to the roadway could be mitigated by street trees, which would obscure the view of the structures
and retaining walls and provide a"green ribbon"along the right-of-way. From Oakesdale Ave.SW
eastward there are existing regularly planted street trees, some of which can be preserved,and additional
new street trees would be installed between the curb and the sidewalk,thus providing a consistent,tree-
lined street image.Trees would be planted a minimum of 25 feet apart,and would be selected for tolerance
of somewhat wetter than normal soil conditions. A conceptual illustration of the landscaping and planting is
shown in fig.5.
11. LIGHT AND GLARE
a. What type of light or glare will the proposal produce? What time of day would it mainly occur?
' Light and glare emanating from temporary construction sites would occur seasonally at the end of the
normal construction period(i.e.,between 7 a.m. and 10 p.m.). If nighttime construction is deemed
necessary,a variance might be required.
Because vehicles would ascend the approach ramps to the roadway overpass then curve down as the slope
lessens toward the crest of the roadway overpass,headlight beams may direct light to the residential areas
on the valley hillsides.
' The distance from this source to the receiving residential sites is more than 5,400 feet to the west and 6,600
feet to the east. While this light source would be largely obscured by predominately deciduous trees within
the residential areas,these trees will shed leaves during the longest periods of seasonal darkness,which
' corresponds to the greatest time of headlight use.
Streetlights would be provided to illuminate the roadway in accordance with standards established by the
' cities.
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?
Does not apply.
' d. Proposed measures to reduce or control light and glare impacts, if any:
There are existing regularly planted street trees,some of which can be preserved,and additional new street
trees would be installed between the curb and the sidewalk. This planting technique would obscure much of
the light created by automobile headlights after dark and reduce the light spill from the roadway.In the
winter,even bare branches would obscure any light spill from the roadway(approximately 30 percent
opaque). Streetlights can be shielded to avoid light spill from the roadway.
' Strander Blvd.Extension and SW 27"'St.Corridor Improvements,SEPA checklist,September 22,2004 20
' 12. RECREATION
a. What designated and informal recreational opportunities are in the immediate vicinity?
' To the east and west of the proposed project area within an approx. 1 mile,the existing recreational areas
and facilities consist of a few parks and the Christensen Greenbelt Park Trail.The Interurban Trail runs
north-south, perpendicular to Strander Blvd.;a portion of the Interurban Trail lies within the project area in
1 the City of Tukwila.The trail was built and is operated and maintained in a floating 15-foot easement
within the 100-foot Puget Sound Energy transmission line right-of-way.
The only existing recreational facility in the City of Renton within the proposed project area is Springbrook
' Trail,which is planned to run north-south following Springbrook Creek along the west side.Currently,
multiple existing segments of the trail run from the south limit of SW 43`d St.to the north limit,just north
of Monster Road SW. Within the proposed project area,a small existing segment of the Springbrook Trail
' starts at SW 271h St.and runs north.
b. Would the proposed project displace any existing recreational uses? If so,describe.
The Interurban Trail runs north-south, perpendicular to Strander Blvd. It does not currently cross Strander
Blvd.The new segment of Strander Blvd. would directly cross the existing Interurban Trail.During the
construction phase,the pedestrian and bicycle traffic along the trail would have to be re-routed temporarily.
A segment of the Interurban Trail would be permanently removed and the traffic along the trail would have
to be permanently re-routed.A small segment of Springbrook Trail just north of SW 271h St.would have to
be removed due to the increased width of the roadway.
' c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be
provided by the project or applicant, if any:
Because the new roadway segment would cut across the Interurban Trail,an at-grade crossing would be
constructed at West Valley Highway(where bicycle/pedestrian traffic would be directed to the sidewalk on
the north side of Strander Blvd.,where it would cross the roadway at the intersection,and then be directed
to the shared-use path on the south side of Strander Blvd.),or the trail would be modified to cross under the
' roadway overpass structure.No mitigation measures would have to be taken as a result of the impacts on
Springbrook Trail.
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 known archaeological resources eligible for listing in the NRHP are in the proposed project area.
White Lake Site,an occupation site associated with the large historic Duwamish Indian village of Sqoa'lqo,
at the former confluence of the Black, White,and Duwamish rivers(0.7 mile NW of the project area),has
been determined eligible for listing in the National Register of Historic Places(NRHP).
' Tualdad Altu(formerly,Earlington Woods)occupation site is 0.9 mile to the NE of the project area on the
Earlington Golf Course on a natural levee of the former Black River. It consists of at least two occupations
with charcoal,bone and stone tools, FMR,mussel shell,and multiple fire hearths dating between 1360 BP
and 1764 BP and has been determined eligible for listing in the NRHP.
Allentown site,two miles to the NE of the project area,was a seasonally reoccupied fish camp. It dates
between ca. 550 B.P. and A.D. 1900 and is probably eligible for listing in the NRHP.
' Strander Blvd.Extension and SW 27"'St.Corridor Improvements,SEPA checklist,September 22,2004 21
b. Generally describe any landmarks or evidence of historic,archaeological, scientific,or cultural importance
known to be on or next to the site.
The project area would have been available to hunter-fisher-gatherers by approximately 2,300 years ago,
based on the progradation rate of the Green/Duwamish River delta. Research into the historic and pre-
European period, local environment, and archaeological archives and literature indicates that the areas
between the Green River and Springbrook Creek have a high probability for buried hunter-fisher-gatherer,
' ethnographic period,historic Indian,and historic period archaeological resources that may be eligible for
listing in the NRHP.Among the finds in the near vicinity are shell middens,charcoal,fire-modified rock,
and lithics.
King County Department of Planning and Community Development(1979)conducted a county wide
survey to identify historic places,but did not record any historic buildings or structures in the proposed
project area but did record the Longacres Historic District,which is adjacent to the north and east portions
of the project area. All of its structures have been replaced, remodeled,or removed,and therefore,
Longacres Park is probably not eligible for listing in the NRHP.
No traditional cultural places studies have been conducted in the project area vicinity,based on Washington
' Office of Archaeology and Historic Preservation records.
c. Proposed measures to reduce or control impacts, if any:
A professional archaeologist should monitor ground-disturbing activities in native alluvial deposits because
of the high probability for archaeological resources that may be eligible for listing in the NHRP.An
Archaeological Construction Monitoring Plan should be developed early in the planning process so the plan
can be reviewed and implemented prior to any subsurface work or excavation.
14. TRANSPORTATION
ia. Identify public streets and highways serving the site,and describe proposed access to the existing street
system. Show on site plans, if any.
' The project vicinity area includes the West Valley Highway(SR 181)to the west, SW Grady Way to the
north, SR-167 to the east,and SW 43`d Street to the south. The transportation system serving the project
vicinity and study area include I-405, SR 167,West Valley Highway(SR 181),Strander Blvd.,SW Grady
Way, SW 43`d St., East Valley Road, SW 271h St.,Oakesdale Ave. SW,and Lind Ave. SW.
b. Is site currently served by public transit? If not,what is the approximate distance to the nearest transit stop?
' Yes. Several bus lines provide service through the area.At the northern end of the project area is the
parking area for the new Tukwila Station for the Sounder interurban commuter transportation train and for
several public bus lines.
c. How many parking spaces would the completed project have? How many would the project eliminate?
' The project of itself would not provide any new parking spaces.
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?
The project would create a cross-valley link between West Valley Highway(SR 181)and Oakesdale Ave.
SW with a single roadway overpass of both a Union Pacific Railroad(UPRR)track and two Burlington
Northern Santa Fe Railroad(BNSF)tracks. From Oakesdale Ave. SW to East Valley Road, SW 27` St.
would be widened with pedestrian facilities and landscaping added.The project area would be
approximately 100 acres. The five elements of the project,and the new and improved road segments,are
further described in question A(11).
' Strander Blvd. Extension and SW 27`h St.Corridor Improvements,SEPA checklist,September 22,2004 22
e. Will the project use(or occur in the immediate vicinity of)water, rail,or air transportation?If so,generally
describe.
Yes,the UPRR and BNSF railroads have tracks in the western part of the project area. Burlington Northern
Santa Fe Railway operates approximately 60 freight trains per day through the proposed project area,and
Union Pacific Railroad operates approximately 15 to 20 UPRR freight trains through the corridor daily.At
the northern end of the project area is the parking area for the new Tukwila Station for the Sounder
1 interurban commuter transportation train and for several Metro King County bus lines.
Sounder and Amtrak operate 18 to 20 trains per day through the proposed project area. Sound Transit has a
temporary commuter rail platform immediately north of the possible railway overpass structure
improvements;Amtrak passenger trains also use the platform. The current schedule for construction of the
permanent platforms at the future Tukwila Station is uncertain but is anticipated within the next several
years.
f. How many vehicular trips per day would be generated by the completed project? If known, indicate when
peak volumes would occur.
The project itself would not generate any additional long-term vehicular trips. However,by facilitating
better access into and through the area the project would indirectly result in a greater number of trips that
would pass through the area. Insofar as the project would indirectly facilitate the further commercial
development of the area, it would also indirectly result in a greater number of vehicular trips whose
destination would be within the project area or its immediate vicinity.
g. Proposed measures to reduce or control transportation impacts, if any:
The proposed project is listed in the Renton Arterial Plan and in the Tukwila CIP program. The purpose of
the project is to improve travel speed,reliability,and access in the north Renton/south Tukwila area.
Without the development of the proposed project,alternative routes would need to be identified and
evaluated to increase east-west traffic capacity,and several intersections that are near or at capacity would
require additional capacity improvements.
The additional roadway capacity created by the construction of the proposed project would attract new
vehicular trips to the project area, either as an easier commute route or as a new trip generated by
development drawn to the area because of easier access.Because of the additional traffic generated, seven
of the study intersections are nearing or at capacity under future conditions operations and may need to be
revised to accommodate revised traffic patterns as drivers divert their trips to seek the path of least
resistance.The proposed project would allow for the diversion of existing traffic from the SW Grady Way
' or SW 43rd St. corridor that would free up capacity at intersections along those routes and significantly
reduce overall average delay at key intersections. In general,the long-term traffic impact should be
beneficial,with less vehicle congestion and delay because of the existence of an arterial roadway that
moves vehicular traffic east and west across the valley from West Valley Highway to East Valley Road.
The new arterial would help to support the regional growth forecasts,and help in the creation of a balanced
multimodal transportation system.
Construction activity would cause some vehicle delays,particularly at the intersections located throughout
the proposed project area,because of lane reductions that would be established in order to provide work
zones.Travel times would increase for business patrons in the proposed project area. Some commercial
accesses along West Valley Highway may be temporarily rerouted,particularly in the vicinity of Strander
Blvd.Temporary impacts would vary from location to location and result in traffic detours.
Freight traffic would be diverted from SW 43`d St. and SW Grady Way(two congested links that currently
' carry significant freight volumes)onto the proposed extension of Strander Blvd.between West Valley
Highway(SR 181)and Oakesdale Ave. SW. The proposed project would result in a 25 percent decrease in
freight volumes along SW Grady Way and an 18 percent decrease in freight volumes along SW 43`d St.east
of West Valley Highway. This would reduce the proportion of heavy vehicles relative to the total flow of
vehicles along SW Grady Way from 12.6 percent to 8.1 percent. The total number of daily passenger
Strander Blvd.Extension and SW 27"'St.Corridor Improvements,SEPA checklist,September 22,2004 23
1
vehicles along this link is projected to decrease by 27 percent,which is significantly more than the decrease
in truck volumes, and thus the increase in truck percentage relative to total traffic. West Valley Highway
would experience moderate growth in freight volumes as trucks travel to and from the proposed Strander
Blvd. extension.
The anticipated redistribution of traffic with the proposed extension of Strander Blvd. would significantly
reduce the presence of freight traffic along both SW Grady Way and SW 43`d Street.This would improve
traffic flow along both of these corridors by removing slower-moving trucks from the roadway.The
proposed project is also anticipated to increase the freight volumes along West Valley Highway.
The Strander Blvd. extension is projected to carry over 1,400 bus transit passengers daily and save each of
those passengers up to 2 minutes in reduced travel time. In addition,the proposed action is also projected to
directly lead to an increase of between 400 and 600 new transit trips daily when land is fully redeveloped in
the Renton area adjacent to the Strander Blvd. extension.
Impacts on Rail Operations.There would be no impacts to rail operations during construction because the
rerouted tracks would be constructed without interruption to the existing tracks. Service would be rerouted
to the new tracks upon completion.
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.
This project would not result in an increased need for public services. During construction, fire,medic
1 units,and police could experience some minimal delays in response times.This could occur on the existing
segment of SW 27`h St. due to temporary lane closures and daily construction activities.
b. Proposed measures to reduce or control direct impacts on public services, if any.
Emergency services would be provided with regular updates on the progress of the construction activities
and adequate notice of any proposed road closures or lengthy traffic delays. Emergency vehicles would be
encouraged to use alternative routes to avoid potential delays when possible.Personnel controlling the
movement of vehicles along roads where construction works are being carried out would give priority to
emergency vehicles over other vehicles.
16. UTILITIES
a. Circle utilities currently available at the site electricity atural gas Ovate ,refuse servic telephone
sanitary sewer septic system,other.
The relocation of the UPRR track would result in the track crossing over the Cedar River water pipeline,
thus causing property ownership and easement issues and special construction requirements for the track
over the pipeline. There is an overhead power line west of Oakesdale Ave. SW within the proposed
roadway improvement limits for approximately 550 feet.
Several existing utilities within the area of the proposed new roadway segment or along SW 271h St. include
buried telephone, gas lines,sanitary sewer pipe,storm drain pipe and structures,buried power lines,and
water lines. Most run north-south,perpendicular to the proposed roadway alignment,and several run
' through the existing intersections.Construction would affect the existing storm drain lines and structures,
most of the remaining utilities would be affected as a result of the location of new storm drain lines and
detention/water quality facilities,and there could be possible interruptions in the service of some utilities.
' 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.
1 Strander Blvd.Extension and SW 27'"St.Corridor Improvements,SEPA checklist,September 22,2004 24
Some existing utilities would be relocated. Existing utilities(railroad signal and communication lines,fiber
optic and telephone lines)that currently run parallel with the railroad tracks in the right-of-way and cross
the proposed roadway alignment area would have to be relocated.The relocation of the UPRR track would
require the settling of property ownership and easement issues with Seattle Public Utilities and the
construction of the crossing of the pipeline would be based on Seattle Public Utilities' requirements.
For some other existing utilities,new lengths would be constructed,or could be relocated.New storm drain
lines and detention/treatment facilities will be constructed. In coordination with the road project the City of
Renton will install a water supply line and a sanitary sewer line(the size of each of these may be up to 12
inches in diameter)within easements and crossing the road right-of-way. The remaining utilities in this area
are underground utilities and most likely could remain in their current locations.
C. SIGNATURE
I, the undersigned, state that to the best of my knowledge the above information is true and complete.
It is understood that the lead agency may withdraw any declaration of non-significance that it might
issue in reliance upon this checklist should there be any willful misrepresentation or willful lack of full
disclosure on my part.
' Proponent:
Name Printed:
Date:
r
1 Strander Blvd. Extension and SW 27"St.Corridor Improvements,SEPA checklist,September 22,2004 25
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Strander Blvd.Extension and SW 2,"St.corridor Improvements,SEPA checklist,September 22,2004 29
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Strander Blvd.Extension and SW 27"St.Corridor Improvements,SEPA checklist,September 22,2004 31
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