HomeMy WebLinkAboutSWP272757(1) ' City of Renton
Planning/Building/Public Works
FINAL
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IMPACT
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FIGURE 2.2.2-2 REFINED ALTERNATIVE
1
1
Oakesdale Avenue S .W.
S.W. 16th Street to S.W. 31 st Street
1
Final
Environmental Impact Statement
July 1997
1
1
1
■
1
i
1
1
Prepared by:
' City of Renton
Planning/Building/Public Works
200 Mill Avenue S.
' Renton, Washington 98055
1
Final Environmental Impact Statement Fact Sheet
Fact Sheet
' Title Oakesdale Avenue S.W., S.W. 16th Street to S.W. 31st Street
Description of proposal The proposal is the construction of approximately one mile of four to
' and alternatives five lanes of arterial roadway with sidewalks, drainage system, and
illumination to connect the existing Oakesdale Avenue S.W. at S.W.
16th Street to Oakesdale Avenue S.W. at S.W. 31st Street —
' presently a cul-de-sac. The proposed project includes a bridge
crossing of Springbrook Creek and wetlands south of S.W. 16th
Street, and a bridge crossing of City-owned wetlands south of S.W.
27th Street. The project is proposed for phased construction: the
initial phase includes the Springbrook Creek and wetland bridge and
a three-quarter mile long roadway between S.W. 16th Street and
S.W. 27th Street. The second phase is one-quarter mile long between
S.W. 27th and S.W. 31st Streets and includes the wetland bridge.
Two alternative routes (alignments) for the proposed roadway and a
' no action alternative are analyzed in this draft environmental impact
statement.
' Alternative A (Preferred Alignment). This alternative alignment
locates Phase 1 of the proposed project within the Boeing Company's
Longacres property as shown in the Longacres Office Park master
plan (Draft Environmental Impact Statement, August 1994, and Final
Environmental Impact Statement, March 1995). The Phase 2 project
segment is a direct connection between the Phase I project terminus
and existing Oakesdale Avenue S.W. at S.W. 31st Street (see
Alignment Alternatives, Figure 1.3-1).
Comments received on the DEIS, additional study and discussins
with government agencies has resulted in refinements to the
alternative alignment to further reduce environmental impact of the
proposed project. (See Figure 2.2.2-1.)
Alternative C. This alternative locates the Phase 1 segment of the
proposed project on the eastern property line of the proposed Boeing
Company Longacres Office Park. The proposed roadway alignment
curves to the southwest to rejoin the Alternative A alignment north of
S.W. 27th Street (see Alignment Alternatives, Figure 1.3-1). The
Phase 2 alignment is the same as Alternative A.
' No Action. Under this alternative, the existing gap in the Oakesdale
Avenue S.W. corridor would remain. There would be no public
through access on the Oakesdale Avenue S.W. corridor between S.W.
16th and S.W. 27th Streets and between S.W. 27th and S.W. 31st
Streets. Property owners abutting this missing segment of the
Oakesdale Avenue S.W. corridor would need to provide private
roadways to connect to the public arterial system.
Location of site East one-half of sections 24 and 25, T23N, R4E. The north-south
alignment is parallel to and approximately 2,300 feet west of Lind
ii City of Renton '
Fact Sheet Oakesdale Avenue S.W.
Avenue SW and connects existing sections of Oakesdale Avenue ,
S.W. presently terminating at S.W. 16th Street on the north and S.W. ,
31st Street on the south (see Project Vicinity Map, Figure 1).
Proposal's sponsor City of Renton
Date of implementation Phase 1 construction would be in 1998-99. Phase 2 construction is '
not presently programmed.
Lead Agency City of Renton Planning/Building/Public Work Department ,
Responsible official City of Renton
Planning/Building/Public Works Department
200 Mill Avenue South
Renton, WA 98055
(425)235-2550
List of possible permit, U.S. Army Corps of Engineers
approval, and license Section 404 Clean Water Act
requirements Washington Department of Ecology
401 Certification, Clean Water Act
National Pollutant Discharge Elimination System (NPDES)
Washington Department of Fish and Wildlife
Hydraulic Project Approval (HPA) ,
City of Renton
Clearing and grading permit
Conditional use permit
Shoreline substantial development permit
Utility Agreements
Seattle Water Department '
Drainage District No. 1
Puget Sound Energy
Olympic Pipeline Company
Authors and principal HNTB Corporation.
contributors to EIS 600 108th Avenue N.E., Suite 405
Bellevue, WA 98004
(425)455-3555
INCA Engineers Inc.
11120 N.E. 2nd Street
Bellevue, WA 98004
(425) 450-0933
Osborn Pacific Group Inc.
2025 First Avenue
930 Market Place Tower '
Seattle, WA 98121-2100
(206)448-7956
Final Environmental Impact Statement Fact Sheet
Shapiro & Associates, Inc.
' 1201 3rd Avenue, Suite 1700Seattle, WA 98101
(206) 624-9190
Woodward Clyde Consultants
1500 Century Square
1501 Fourth Avenue
Seattle, WA 98101-1662
(206)343-7933
Kato & Warren
2001 Western Avenue
555 Market Place One
Seattle, Washington 98121
Draft EIS issue date April 7, 1997
Final EIS issue date July 7, 1997
' Subsequent environmental Phase 2 may require additional SEPA review prior to
review implementation.
Location of background City of Renton
information Planning/Building/Public Works Department
200 Mill Avenue South
Renton, WA 98055
(425)235-2550
Cost of copy to public Final EIS $10.00
' iv
Final Environmental Impact Statement Table of Contents
Distribution List
Federal Agencies
U.S. Army Corps of Engineers
' Seattle District Office
Engineering Division- Planning
1 U.S. Department of Agriculture
Resource Conservation Services
Renton Field Office
U.S. Department of HUD
Mr.Nishimura
U.S. Department of Transportation
Department of Highways
District 1
U.S. Environmental Protection Agency
' Jerry Opatz
Native American Tribes
' Duwamish Tribal Offices
Muckleshoot Indian Tribe
Rod Malcomb, Fisheries
State Agencies
Department of Natural Resources
' Puget Sound Water Quality Authority
Abbot Raphael Hall
' SEPA Register
Washington Department of Ecology
Environmental Review
State Department of Ecology
Environmental Review Section
Northwest Regional Office
1 State Department of Ecology
Shorelands- Permit Coordinator
Washington Department of Fish and Wildlife
Larry Fisher
Phil Schneider
Washington State Department of Transportation
' District 1
Washington State Energy Office
Judith Merchant, Director
Regional Agencies
Greater Renton Chamber of Commerce
v '
Final Environmental Impact Statement Distribution List
Puget Sound Air Pollution Control Agency '
Puget Sound Regional Council
Seattle-King County
Health Services Department
Local Agencies '
King County
Department of Development and Environmental Services
Land Use Services Division
King County
Department of Natural Resources
Surface Water Management Division '
King County
Department of Transportation
Transportation Planning Division
King County
Department of Natural Resources
Environmental Planning and Real Estate Section '
King County
Soil Conservation
King County Conservation District '
Jack Davis
King County Courthouse
EIS Review Coordinator
King County Drainage District No. 1
Seattle Public Utilities ,
Water Department
City Agencies (City of Renton) '
Mayor
City Council
City Attorney '
Fire Department
Police Department
Parks& Recreation
Planning Commission
Utilities/Services
Puget Sound Energy '
Olympic Pipeline Company
Libraries ,
Renton Public Library
Main Branch '
Renton Public Library
Highlands Branch
vi
Final Environmental Impact Statement Table of Contents
' Other Public and Private Organizations
City of Kent
City of Tukwila
Valley Medical Center
Washington Environmental Council
' Darlene Madenwald
Media
Valley Daily News
vii
City of Renton
FEIS Oakesdale Avenue S.W.
' TABLE OF CONTENTS
1. SUMMARY.......................................................................................................................................................... 1-1
' 1.1 INTRODUCTION AND BACKGROUND ......................................................................................................... 1-1
1.2 HISTORY AND PURPOSE OF THE PROPOSED PROJECT............................................................................. 1-
1.2.1 Project History............................................................................................................................... 1-1
' 1.2.2 Purpose of the Project................................................................................................................... 1-2
1.3 ALTERNATIVES............................. ............... 1-2
..............................................................................
1.3.1 Alternative A.................................................................................................................................. 1-5
1.3.2 Alternative C.................................................................................................................................. 1-5
1.3.3 No Action Alternative..................................................................................................................... 1-6
1.3.4 Preferred Alternative..................................................................................................................... 1-6
' 1.4 ISSUES TO BE RESOLVED....................................................................................................................... 1-6
1.5 SIGNIFICANT IMPACTS, MITIGATION MEASURES, AND UNAVOIDABLE ADVERSE IMPACTS ........................... 1-6
2. ADDITIONAL INFORMATION.......................................................................................................................2-1
2.1 INTRODUCTION....................................................................................................................................... 2-1
2.2 ALTERNATIVES....................................................................................................................................... 2-1
2.2.1 Selection of the Preferred Alternative............................................................................................ 2-1
' 2.2.2 Alternative A - The Preferred Alternative ...................................................................................... 2-1
2.2.3 Construction Sequencing.............................................................................................................. 2-3
2.3 AFFECTED ENVIRONMENT, IMPACTS, AND MITIGATION............................................................................. 2-5
2.3.1 Air Quality...................................................................................................................................... 2-5
2.3.2 Noise............................................................................................................................................. 2-5
2.3.3 Geology and Soils...........................................................................................................*............. 2-5
2.3.4 Surface Water Quantity/Quality..................................................................................................... 2-5
' 2.3.5 Wetlands..................................................................................................................................... 2-15
2.3.6 Wildlife, Vegetation, and Fisheries.............................................................................................. 2-20
2.3.7 Land and Shoreline Use.............................................................................................................. 2-23
2.3.8 Social Elements........................................................................................................................... 2-25
2.3.9 Transportation............................................................................................................................. 2-28
2.3.10 Parks and Recreation................................................................................................................ 2-28
2.3.11 Visual Resources...................................................................................................................... 2-29
' 2.3.12 Historic and Cultural Resources................................................................................................ 2-30
2.3.13 Hazardous Materials..........................................................................................._.................... 2-30
3. COMMENTS AND RESPONSES......................................................................................................................3-1
viii '
Final Environmental Impact Statement Table of Contents
LIST OF TABLES '
TABLE 1.5-1 SIGNIFICANT IMPACTS, MITIGATION MEASURES, AND UNAVOIDABLE ADVERSE IMPACTS............. 1-7
TABLE 2.3.3-1 EXCAVATION AND FILL QUANTITIES(CUBIC YARDS).....................................................................2-5 ,
TABLE 2.3.4-1 INCREASE IN IMPERVIOUS SURFACE(ACRES)..................................................................................2-7
TABLE 2.3.4-2 FLOODPLAIN STORAGE IMPACTS...................................................................................................2-1 O
TABLE 2.3.5-1 CALCULATION OF WETLAND AREA FILLED OR SHADED...............................................................2-18 ,
TABLE 2.3.5-2 WETLAND REPLACEMENT FOR REFINED ALTERNATIVE A............................................................2-19
TABLE 2.3.6-1 ESTIMATED HABITAT LOSS............................................................................................................2-22
TABLE 2.3.7-1 LAND ACQUISITION REQUIREMENTS(ACRES)...............................................................................2-24
LIST OF FIGURES
FIGURE 1-1. PROJECT VICINITY........................................................................................................................... 1-1
FIGURE 1.3-1 ALTERNATIVE ALIGNMENTS.......................................................................................................... 1-3
FIGURE 1.3-2 TYPICAL CROSS SECTIONS.............................................................................................................. 1-4
FIGURE 2.2.2-1 REFINED ALTERNATIVE A ALIGNMENT..........................................................................................2-2 ,
FIGURE 2.2 2-2 REFINED ALTERNATIVE A ALIGNMENT— TYPICAL CROSS SECTIONS..........................................2-4
FIGURE 2.3.4-1 REFINED ALTERNATIVE A DRAINAGE SYSTEMS............................................................................2-8
FIGURE2.3.5-1 DELINEATED WETLANDS ...........................................................................................................2-17
' City of Renton ix
FEIS Oakesdale Avenue S.W.
Foreword
This Final Environmental Impact Statement (FEIS) has been prepared to comply with the State
Environmental Policy Act(SEPA Chapter 43.21C RCW), and the City of Renton's SEPA Policy.
' A Draft Environmental Impact Statement (DEIS) for the City of Renton's proposed Oakesdale Avenue
S.W. Extension Project -- S.W. 16th Street to S.W. 31st Street was published on April 7, 1997 and
' distributed to federal and state agencies, to Native American tribes, and to a variety of local agencies and
interest groups (see Distribution List on page iv of the FEIS). The thirty day review/comment period
ended on May 6, 1997. Written comments were received from two State agencies, City of Seattle Public
Utilities, City of Renton Community Services, and Friends of Black River (a local ad hoc group of
citizens).
In addition to the Fact Sheet, Distribution List and this Foreword, this FEIS includes Chapter 1 -
Summary; Chapter 2 - Additional Information; and Chapter 3 - Comments and Responses.
Based on comments received on the DEIS, discussions with government agencies, and additional studies
' investigating ways to minimize impacts of the project (and reduce the project cost), refinements have
been made to Alternative A (the Preferred Alternative). A description of impacts on the affected
environment and modifications to mitigation measures, where appropriate, as a result of the refinements
to Alternative A are included in Chapter 2.
FEIS Process and Schedule
Following issuance of this FEIS, the City will prepare a Mitigation Document which will set forth the
mitigation measures for the project.
t
Final Environmental Impact Statement 1-1
Summary
1 . Summary
1.1 Introduction and Background
The City of Renton proposes to acquire right-of-way
for and construct a one-mile section of arterial �Rg°° sWs��s \,
roadway. Figure 1-1 (Project Vicinity map) shows 'm -X
the proposed project in relationship to the existing
— _ ", 0akesq� -Begin
roads in the area. The project will begin at the �� s�,. Project
existing intersection of S.W. 16th Street with A, ` yea �`��;
Oakesdale Avenue S.W. and end at existing Tukwila � ; 0
Oakesdale Avenue S.W. at S.W. 31st Street. The � 405:BNB Renton
roadway (including travel lanes and turn lanes) would
vary from four to five lanes in width. The project F Pro ec(1
Snander BNd SW 27 St___
would include sidewalks, bicycle lanes, traffic control �--------- — � a
devices (stop signs and/or traffic signals), m �m
landscaping, lighting, and drainage facilities. The — '. N-sw 34thsc__>
' typical right-of-way width is expected to be 90 feet. "
At this time the proposed right-of--way corridor _ a+3 ._SW_41st
includes some privately owned properties and s,eahst p; °�W41_;St{ i
m property owned by the City of Renton.
Kent
The project would be constructed in two phases. The
O
initial phase would connect between S.W. 16th Street
and S.W. 27th Street, a distance of about three- ° . 14--'2
Miles Q
quarters of a mile. The second phase of the project
' would be about one-quarter mile in length. FIGURE 1-1PROJECT VICINITY
Preliminary investigation by the City and their
environmental consultant has narrowed the location (i.e., alignment) of the new proposed roadway to two
' alternatives.
The City of Renton issued a declaration of significance for this project and conducted a public scoping
process. A scoping meeting was held on March 16, 1995 at 7:00 p.m. at the Renton Community Center,
1715 Maple Valley Highway. The comment period on scoping issues ended on March 27, 1995.
Following the public scoping period, the specific alternatives to be included in the environmental impact
' statement (EIS) were confirmed by the City. Evaluation in the EIS focuses on potentially significant
environmental impacts from both building and operating the new section of Oakesdale Avenue S.W.
The Draft Environmental Impact Statement (DEIS) addresses the impacts of the roadway and bridge
project as called for by SEPA and presents mitigation measures where needed.
1.2 History and Purpose of the Propose Project
1.2.1 Project History
' Planning for Oakesdale Avenue S.W. between S.W. 16th and 31st Streets began in 1980 with the Valley
Parkway S.W., S.W. 43rd Street to Empire Way S, Advance Planning Study Report prepared for the City
of Renton. At the time this study was conducted in 1980 to 1982, the most southerly two blocks of the
City of Renton 1-2 ,
FEIS Oakesdale Avenue S.W.
the route, between S.W. 43rd Street and S.W. 41st Street, had been constructed with abutting industrial
park development. Subsequent to the 1992 study, Oakesdale Avenue S.W. was constructed between
S.W. 41st and S.W. 31st Street as adjacent industrial parcels have developed, and the northern section of
the route has been completed between Monster Road and S.W. 16th Street. The one-mile section
between S.W. 16th and S.W. 31st Streets remains the only undeveloped section of the project
recommended in the 1982 report. ,
The Advance Planning Study also recommended an alignment for S.W. 27th Street between East Valley
Highway and West Valley Highway at Strander Boulevard. This road would intersect with the
recommended Oakesdale Avenue S.W. alignment. At the time of the 1980-1982 study, the portion of
S.W. 27th Street east of the Boeing Longacres Office Park property was in design, and construction was
completed in 1982. There are no current plans to extend S.W. 27th Street as a public road west of the
proposed Oakesdale Avenue S.W. alignments. '
1.2.2 Purpose of the Project
The Oakesdale Avenue S.W. project is one of the planned arterial system improvements (Arterial Plan) ,
identified by the City of Renton as mitigation for the Land Use Element of the adopted Comprehensive
Plan (1995). The Arterial Plan was developed to provide a roadway system that will meet the year 2010 '
level of service standard and be concurrent with year 2010 land use development. Along the proposed
project corridor, proposed development includes the 10,000-employee Longacres Office Park site.
The proposed Oakesdale Avenue S.W. project would have the following purposes: '
• increase the person-carrying capacity of the Renton Valley arterial system by the construction of
improvements and the implementation of actions that support single-occupant vehicle (SOV), high- '
occupant vehicle (HOV), and transit modes of travel;
• maintain, enhance, and increase pedestrian and bicycle travel by providing both safe and convenient
routes for the commuting and recreating public; and '
• support land use, neighborhood, and business goals, and improve safety.
1.3 Alternatives
Two build alternatives (Alternatives A and C) and the No Action Alternative (as specified by SEPA '
rules) are analyzed in this EIS for the Oakesdale Avenue S.W. project. The location of the two build
alternatives are identified in Figure 1.3-1.
For project impact analysis, two bridge structures (one crossing Springbrook Creek and constructed ,
wetlands on Boeing CSTC property at the north end of the project, and the second crossing existing
wetlands south of S.W. 27th Street) were assumed for each of the build alternatives. The typical cross-
sections shown in Figure 1.3-2 were used for both build alternatives. The build alternatives provide four '
travel lanes (two in each direction) for the full length of the project. Between S.W. 16th Street and S.W.
27th Streets, a center turn lane/median would be provided to allow separated left turn movements at the
intersections of S.W. 16th Street and S.W. 27th Street, and at other locations that may be approved in the
future as abutting property is developed. South of S.W. 27th Street, the center turn-lane median would
be dropped providing four travel lanes. Bicycle lanes on the outside (right-hand) of the motor vehicle
travel lanes and sidewalks on both sides of the new roadway would be provided the full project length. '
The proposed project would also include roadway pavement, curbs, gutters, street lighting, landscaping,
roadway drainage facilities(including detention and treatment) and traffic signals (when warranted)at
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200<400 800 Feet
City of Renton 1-4 ,
FEIS Oakesdale Avenue S.W.
FIGURE 1.3-2 TYPICAL CROSS SECTIONS '
q ROADWAY&RIGHT OF WAY
90'RIGHT OF WAY ,
6' 6' 5' 11' 11' 10' - 12' 11' 11, 5' 6' 6'
SIDEWALK PUNT IKE LANE LANE MEDIAN OR LANE LANE BIKE- ANT SIDEWALK '
STRIP LANE TURN UNE LANE I STRIP
TYPICAL ROADWAY SECTION ,
q ROADWAY k RIGHT OF WAY ,
82'
79' '
6.5' S' if' 12' 10' 12" 11' S' 6.5'
SIDEWALKI BIKE LANE LANE MEDIAN LANE LANE BIKE I SIDEWALK
LANE LANE
i
GROUND ,
PILES (TIP.) ,
NORTH BRIDGE TYPICAL SECTION
q ROADWAY&RIGHT OF WAY
7 6r
6.5' 5' 11' 11' 11' 11' S' 6.5'
DEWALX BIKE LANE UNE UNE LANE BIKE SIDEWA '
LANE LANE
i
GROUND
PILES (TIP.) '
SOUTH BRIDGE TYPICAL SECTION '
Final Environmental Impact Statement 1-5
Summary
' S.W. 16th Street and at S.W. 27th Street. Access to abutting properties would be determined in the
permitting and approval of abutting development. The proposed project would be constructed in two
phases: Phase 1, from S.W. 16th Street to S.W. 27th Street; and Phase 2, from S.W. 27th Street to S.W.
3l st Street. Impacts and mitigation measures associated with each phase of the project have been
addressed, when appropriate, for each of the build alternatives.
1.3.1 Alternative A
Beginning at the existing Oakesdale Avenue S.W. and S.W. 16th intersection, the alignment curves to
the southwest through Benaroya Company (former Group Health) property, crosses Springbrook Creek
about 400 feet south of S.W. 16th Street, and enters the Boeing Customer Service Training Center
(CSTC) property. The alignment then curves to the southeast through the CSTC property and enters the
Boeing Company Longacres Office Park property on a southerly bearing at S.W. 19th Street. The
alignment extends south through the Longacres Office Park property to approximately 1,000 feet north of
SW 27th Street. From this point, the alignment continues south to S.W. 27th Street along the Longacres
' Office Park east property line (City of Renton west property line). South of S.W. 27th Street, the
alignment continues south on City of Renton property to join existing Oakesdale Avenue S.W. at S.W.
31 st Street.
An approximately 400-foot long structure is proposed for the north bridge crossing Springbrook Creek
and the CSTC Boeing constructed wetlands, and a 600-foot long structure is proposed for the south
bridge crossing wetlands south of S.W. 27th Street.
Typical right-of-way width for the project would be 90 feet. Total right-of-way required for Alternative
A would be 9.7 acres for construction of Phase 1 between S.W. 16th and S.W. 27th Streets, and 2.4 acres
' for construction of Phase 2 between S.W. 27th and 31st Streets. An additional 0.6-acre would be
required for permanent easements along the Phase 1 portion of the project.
1.3.2 Alternative C
The alignment of Alternative C begins at the existing Oakesdale Avenue S.W. and S.W. 16th Street
intersection, continues in a south-southeasterly direction through the Benaroya Company (former Group
Health) property before turning south to cross Springbrook Creek about 800 feet south of S.W. 16th
Street and pass through the Boeing Company CSTC property. The alignment then continues due south
along the Longacres Office Park east property line for about 800 feet, where the alignment curves to the
southwest to join the Alternative A alignment approximately 900 feet north of S.W. 27th Street. From
this point, the Alternative C alignment coincides with the Alternative A alignment continuing south to
S.W. 3 I st Street.
An approximately 540-foot long structure is proposed for the north bridge crossing Springbrook Creek
and the Boeing CSTC constructed wetlands, and a 600-foot long structure is proposed for the south
bridge crossing wetlands south of S.W. 27th Street.
Typical right-of-way width for the project would be 90 feet. Total right-of-way required for Alternative
' C would be 11.2 acres for construction of Phase 1 between S.W. 16th and S.W. 27th Streets, and 2.4
acres for construction of Phase 2 between S.W. 27th and 31st Streets. An additional 0.3-acre would be
required for permanent easements along the Phase 1 portion of the project.
City of Renton 1-6 ,
FEIS Oakesdale Avenue S.W.
1.3.3 No Action Alternative ,
The No Action Alternative will be carried through this DEIS to provide a baseline point for comparison
of Action Alternatives. Under this alternative, the existing gap in the Oakesdale Avenue S.W. corridor
between S.W. 16th Street and S.W. 27th Street would remain.
The No Action Alternative assumes that other roadway system (arterial, HOV, bicycle, and pedestrian) '
and transit service improvements planned for the Renton Valley area (described in Section 3.9,
Transportation) would be in place by the year 2010. Access to properties abutting this missing segment
of the Oakesdale Avenue S.W. corridor is assumed to be provided by private road connections to both '
S.W. 16th Street and S.W. 27th Street. Developer and City of Renton-initiated transportation demand
management (TDM) programs in support of City of Renton policies and Commute Trip Reduction
legislation are assumed to continue or be augmented under the No Action Alternative. '
1.3.4 Preferred Alternative
After review of the potential significant impacts and mitigation requirements, and comments received ,
from circulation of the DEIS, Alternative A is the City of Renton's preferred alternative. Alternative A
provides the most direct route with the least environmental impact.
Based on comments received on the DEIS, discussions with the U.S. Army Corps of Engineers and other '
government agencies, and recommendations of a Value Engineering Study to investigate options for
reducing the cost of the proposed project, refinements have been made to the Preferred Alternative
(Alternative A) to further minimize this alternative's impacts on the environment. A description of these '
refinements, and additional information on existing conditions, significant impacts and mitigation
measures related to the refined Alternative A, are presented in Section 2, Additional Information.
1.4 Issues to Be Resolved
SEPA Rule WAC 197-11-440 states that the EIS summary shall include a discussion of any issue to be '
resolved relative to the proposed action and alternatives. No such issues have been identified.
1.5 Significant Impacts, Mitigation Measures, and Unavoidable
Adverse Impacts
Table 1.5-1 summarizes the impacts, mitigation measures, and significant unavoidable adverse impacts
for each of the alternatives. The number in parentheses after each environmental element refer to the
corresponding section number in Chapter 3 of the DEIS.
Final Environmental Impact Statement 1-7
Oikesdale Avenue S.W.
TABLE 1.5-1 SIGNIFICANT IMPACTS, MITIGATION MEASURES, AND UNAVOIDABLE ADVERSE IMPACTS
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0) Optional Adverse Impacts (0) Optional Adverse Impacts
AIR QUALITY (3.1) AIR QUALITY(2.3.1)
Alternative A,
Phases 1 and 2
Construction activities Comply with the City of None. Same as DEIS Same as DEIS Same as DEIS
would increase Renton Mining,
particulate emissions Excavation and Grading
and other pollutants in Ordinance (Title IV, City
the project vicinity. of Renton Building Regu-
lations, Chapter 10), the
King County Surface
Water Design Manual as
adopted by the City of
Renton, and PSAPCA
Regulation I, Section 9.15
regarding fugitive dust
control, and odor control.
(R)
NOISE (3.2) NOISE (2.3.2)
Alternative A,
Phases 1 and 2
Project would Minimize noise impacts to None. Same as DEIS Same as DEIS Same as DEIS
introduce vehicle adjacent properties
noise into existing through appropriate site
developed and future design of future
development sites. development or
redevelopment. (0)
Short term construc- Implement mitigation None. Same as DEIS Same as DEIS Sarne as DEIS
tion noise impacts on measures required b
July 1997
1-8
rclS
Significant Impacts, Mitigation Measures, and Unavoidable Adverse Impacts
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0) Optional Adverse Impacts (0)Optional Adverse Impacts
adjacent developed Renton City Code. (R)
properties.
GEOLOGY AND GEOLOGY AND SOILS
SOILS (3.3) (2.3.3)
Alternative A,
Phases 1 and 2
Water and wind Comply with City of Mitigation measures will Same as DEIS Same as DEIS Same as DEIS
erosion of soils. Renton Standard Speci- not completely stop
fication for Municipal water and wind erosion.
Construction and King
County Surface Water
Design Manual (as
adopted by the City of
Renton, Title IV, City of
Renton Building Regu-
lations, Chapter 22). (R)
Comply with the City of
Renton Land Clearing
and Tree Cutting
Ordinance and Mining,
Excavation, and Grading
Ordinance for vegetation
clearing and earthwork.
(R)
Provide mitigation plan for
clearing and grading. (R)
Cover topsoil with plastic
sheeting during
construction. (R)
Replant newly con-
structed earthen em-
bankments, roadway
shoulders, drainage
channels with erosion
control seed mixtures as
July 1997
rr r r r r r r r r r r r r rr r rr r r r
Final Environmental Impact Statement 1-9
Oakesdale Avenue S. V.
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0) Optional Adverse Impacts (0)Optional Adverse Impacts
soon as possible. (R)
Stabilized construction
access points to limit
tracking of soils on to the
existing roadways. (R)
Clean adjacent roadways.
(R)
Limit stormwater runoff,
erosion, and sediment
transport from exposed
and/or new impervious
areas by using detention
and sediment control
such as silt fences,
anchored straw bales,
and temporary sedimen-
tation ponds. (R)
Preserve a buffer zone
adjacent to wetland and
creek areas,whenever
possible. (0)
Alternative A will Test excavated materials None. Same as DEIS Same as DEIS Same as DEIS
require about 29,200 for use as fill material to
and 12,600 cubic reduce quantity of
yards of fill for Phase material brought in from
1 and Phase 2, off-site. (R)
respectively.
Post-construction Use special construction Differential setllernent Same as DEIS Same as DEIS Same as DEIS
settlement of soils. sequences and of existing utilities will
procedures. (R) occur to a lesser
degree. Hydraulic
Use light-weight embankment materials. conditions in gravity
(0) lines may be altered.
July 1997
1-10
FEIS
Significant Impacts, Mitigation Measures,and Unavoidable Adverse Impacts
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0)Optional Adverse Impacts (0) Optional Adverse Impacts
Structures will be Use structure and pipeline None. Same as DEIS Same as DEIS Same as DEIS
located in a seismic construction practices in
area. Uniform Building Code
appropriate to seismic
zone 3. (R)
Design of bridges should
withstand low to moderate
levels of ground shaking
and to resist structural
failure during extreme
seismic events. (R)
Reduce the likelihood of
liquefaction by using
ground densification
techniques such as vibro-
flotation, installation of
stone columns, or
dynamic compaction. (R)
SURFACE WATER SURFACE WATER
QUANTITY/QUALITY QUANTITY/QUALITY
(3.4) (2.3.4)
Surface Water
Quantity
Alternative A,
Phases 1 and 2
For Phase 1 and Provide compensatory None. For Phases 1 and 2 of Same as DEIS Same as DEIS
Phase 2, fill within the flood storage. (R) the refined Alternative
FEMA 100-year A, fill within the City of
Z
floodplain would result Comply with one 's Renton 100-year
in the loss of 330 and Flood Hazard Zone Ordinance. R floodplain would result
7,970 cubic yards, ( ) in the loss of 1,380 and
respectively, of flood Include location of 100- 8,500 cubic yards,
storage. year floodplain on respectively, of flood
roadway plans. (R) storage.
July 1997
Final Environmental Impact Statement
Oakesdale Avenue S.W.
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0) Optional Adverse Impacts (0) Optional Adverse Impacts
For Phase 1 and Design and analysis of Some loss of infiltration For Phases 1 and 2 of Analysis and design of Same as DEIS
Phase 2, increased surface water runoff to groundwater due to the refined Alternative surface water runoff
surface water runoff conveyance system, increased impervious A, increased surface conveyance system,
due to addition of 7.16 including control of runoff area. water runoff due to the and peak discharge
and 0.40 acres, discharge, per King addition of 7.07 and control, per King County
respectively, of County Surface Water 0.40 acres, Surface Water Design
impervious surface. Design Manual respectively, of Manual (KcsWDM)
(KCSWDM) adopted by impervious surface. adopted by the City of
the City of Renton, and Renton and Department
per other city, state and of Ecology's
federal regulations. (R) Stormwater Manual for
Puget Sound. ( R)
Phase 1 would require Relocate outlet control None. Refined project avoids Not applicable. Not applicable.
relocation of the structure in coordination impact..
Boeing CSTC wet- with affected property
land/detention outlet owner, and in accordance
control structure. with City of Renton and
other local, state and
federal, requirements.
(R)
Interruption of existing Provide substitute con- None. Same as DEIS Same as DEIS Same as DEIS
surface water flow veyance systems in
patterns and coordination with affected
conveyance systems property owners, and in
in Phase 1 accordance with City of
Renton requirements. (R)
Under Phase 1, Participate in the City of None. Refined project avoids Not applicable. Not applicable.
increase in Spring- Renton ESGRW Project's impact_.
brook Creek upstream proposed Springbrook
water surface eleva- Creek channel widening
lion as a result of improvements for mitiga-
placement of bridge tion of increase in water
column/pier in the surface elevations. (R)
100-year flow stream
channel.
July 1997
1-12
FEIS
Significant Impacts, Mitigation Measures, and Unavoidable Adverse Impacts
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0)Optional Adverse Impacts (0)Optional Adverse Impacts
Surface Water
Quality
Alternative A,
Phases 1 and 2
Potential for increased Minimize soil erosion and Percentage of nutrients Same as DEIS Same as DEIS Same as DEIS
sediment, nutrient sedimentation using best and metals from the site
loads, and management practices would enter receiving
contaminants per KCSDWM and waters
reaching wetlands Renton Storm and
and Springbrook Surface Water Drainage
Creek during and Ordinance, and through
following construction. implementation of the
provisions set forth in the
City of Renton Standard
Specifications for
Municipal Construction.
(R)
Construction would likely Same as DEIS Same as DEIS Same as DEIS
require temporary Water
Quality Modification from
Ecology. (R)
Comply with surface Same as DEIS Same as DEIS Same as DEIS
water quality protection
requirements of Land
Clearing and Tree Cutting
Ordinance and Mining,
Excavation, and Grading
Ordinance. (R)
Provide water quality Provide water quality Same as DEIS
treatment(biofiltration treatment per the 1990
swales,wetpond or KcswDM adopted by the
combination welvault and City of Renton, and the
biofiltration swale) per Department of
July 1997
Final Environmental Impact Statement 1-13
Oakesdale Avenue S.W.
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0)Optional Adverse Impacts (0) Optional Adverse Impacts
1990 KCSWDM adopted Ecology's Stormwater
by the City of Renton. (R) Manual for Puget
Sound. (R )
Obtain a NPDES Permit Sarne as DEIS Same as DEIS Same as DEIS
from Ecology. (R)
Comply with applicable Same as DEIS Same as DEIS Same as DEIS
state Hydraulic Code
Rules and HPA Permit
conditions. (R)
Maintenance of water Same as DEIS Same as DEIS Same as DEIS
quality treatment facilities
to ensure that they
function as intended. (0)
Potential for warm Provide landscaping None. Same as DEIS Same as DEIS Same as DEIS
stormwater runoff around open detention
reaching Springbrook facilities to reduce
Creek warming of stormwater.
(0)
WETLANDS (3.5) WETLANDS (2.3.5)
Alternatives A,
Phases 1 and 2
Potential temporary Minimize and mitigate for None. Same as DEIS Same as DEIS Same as DEIS
loss of wetland loss of wetland as
acreage and required by City of
functional values as a Renton. (R)
result of filling and
shading. Activities affecting wet-
lands likely subject to
Sections 401 and 404 of
the Federal Clean Water
Act. (R)
Create wetland by re-
moving the earth berm
July 1997
1-14
FEIS
Significant Impacts, Mitigation Measures,and Unavoidable Adverse Impacts
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0) Optional Adverse Impacts (0)Optional Adverse Impacts
separating Welland F
(City of Renton) and
Wetland G (City of
Renton) and the
Longacres Office Park
south marsh. (0)
WILDLIFE, WILDLIFE,
FISHERIES, AND FISHERIES, AND
VEGETATION (3.6) VEGETATION (3.6)
Alternative A,
Phases 1 and 2
Loss of forest, field, Conformance with Net loss of native Sarne as DEIS Same as DEIS Sarne as DEIS
and wetland regulations of the City of vegetation and wildlife
vegetation resources Renton Land Clearing habitat.
and loss of wildlife and Tree Cutting
habitat. Ordinance, and Mining,
Excavation, and Grading
Ordinance. (R)
Re-seed upland areas Same as DEIS Same as DEIS Same as DEIS
with perennial grass
immediately following
construction. (R)
Plant native vegetation
types in disturbed areas
adjacent to the project
right-of-way. (0)
Landscaping along the
roadway edges within the
project right-of-way. (0)
Coordinate plantings and
landscaping with
adjacent property
owners. (0)
July 1997
Final Environmental Impact Statement 1-IS
Oakesdale Avenue S.W.
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0) Optional Adverse Impacts (0) Optional Adverse Impacts
Creation of barrier to Bridges will allow some Creation of barrier for Same as DEIS Box culvert will allow Same as DEIS
wildlife movements. wildlife movement under some wildlife species. sorne wildlife
the new road. (0) movement under the
Phase 2 roadway.
Short-term distur- Replace vegetation, in None. Short-term disturbance Same as DEIS Same as DEIS
bance of native kind,where necessary. of native vegetation
vegetation during (R) during retained fill
bridge construction in construction in the
the CSTC wetland. CSTC welland.
Short-term distur- Avoid land clearing Temporary disruption Same as DEIS Same as DEIS Same as DEIS
bance of wildlife, during nesting periods to wildlife, wildlife
wildlife habitat, and (early spring), if possible. habitat, and fisheries
fisheries resources (0) resources.
during construction.
Permanent and Relocate, avoiding None. Same as DEIS Same as DEIS Sarne as DEIS
temporary relocation nesting periods, if
of wildlife enhance- possible. (R)
inenl features. Planting plans for wet-
lands,wetland buffers,
and disturbed areas
could include habitat
enhancement features.
(0)
Potential sedimenta- Conformance with None. Same as DEIS Same as DEIS Same as DEIS
tion of Springbrook measures in WDFW
Creek during HPA permit. (R)
construction.
Prepare and implement
erosion/sedimentation
control plan. (R)
July 1997
1-16
FEIS
Significant 1n►pacts, Mitigation Measures, and Unavoidable Adverse Impacts
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0) Optional Adverse Impacts (0) Optional Adverse Impacts
LAND AND LAND AND '
SHORELINE USE SHORELINE USE
(3.7) (2.3.7)
Alternative A,
Phases 1 and 2
Potential short term See Sections 3.1, 3.2 and None. Same as DEIS Same as DEIS Same as DEIS
construction impact 3.3 for mitigation for
on adjacent land use. construction related air,
noise and dust impacts,
respectively. (R)
Coordinate construction
activities to minimize
impacts on adjacent
businesses. (R)
Land acquisition and Compensate property None. Same as DEIS Sarne as DEIS Same as DEIS
easements required owners for land
for roadway right-of- acquisition. (R)
way, drainage
facilities and wetland Investigate adjustments to
mitigation. roadway alignment to
minimize impacts. (0)
Project will require Obtain a substantial None. Same as DEIS Same as DEIS Same as DEIS
construction in urban development permit for
and conservancy shoreline construction.
shoreline (R)
environments.
SOCIAL ELEMENTS SOCIAL ELEMENTS
(3.8) (2.3.8)
Alternative A,
Phases 1 and 2
Phase 1 would require Relocate drainage None Refined project avoids Not applicable Not applicable.
relocation of the structure in compliance impact.
Boeing CSTC wetland with all applicable
July 1997
Final Environmental Impact Statement 1-17
Oakesdale Avenue S.W.
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0)Optional Adverse Impacts (0) Optional Adverse Impacts
outlet control standards and regulations
structure. of local, state and federal
agencies. ( R )
Coordinate relocation with
affected property owner.
(R)
Phase 1 will require Relocation will be None identified.
relocation of a section coordinated with Boeing
of Boeing CSTC and will comply with all
irrigation line and the applicable standards
vault housing aerating and regulations. ( R)
pumps.
Phase 1 will require Relocation will be None identified.
relocation of water coordinated with
lines, hydrants and Boeing,where
valves. necessary, and the City
of Renton Water Utility,
and will comply with all
applicable standards
and regulations. (R )
Potential settlement and Design and construction None identified.
other impacts to King of Phase 2 fill and
County Metro 72-inch retaining structures will
trunk sewer resulting be coordinated with
frorn Phase 2 King County Metro. ( R )
construction.
Phase 1 would require Puget Power would None identified. Refined project avoids Not applicable. Not applicable.
relocation of 115kV relocate power lines, impact.
power lines, where necessary, and in
conformance with their
requirements to assure
disruptions to service
would be minimized. (R)
July 1997
1-18
AS
Significant Impacts, Mitigation Measures, and Unavoidable Adverse Impacts
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0) Optional Adverse Impacts (0) Optional Adverse Impacts
Phase 2 construction King County Metro would None. Same as DEIS Sarne as DEIS Same as DEIS
would place bridge be included in the design
structure close to, and process for the structure
potentially impact, an footings in the vicinity of
existing 72-inch Metro this 72-inch sewer. (R)
trunk sewer.
Special coordination and
precautionary measures
would be taken if pile
driving is allowed near the
72-inch sewer. (R)
TRANSPORTATION TRANSPORTATION
(3.9) (2.3.9)
Alternative A,
Phases 1 and 2
Phase 1 would place Project is included in city- None. Same as DEIS Same as DEIS Same as DEIS
a public road and wide transportation plan
traffic in an area (SW to reduce delays and
16th to SW 27th improve access and
Street) currently safety for forecast year
without public access, 2010 conditions and
and would beyond. (R)
substantially increase
traffic on Oakesdale
Avenue SW south of
SW 31 st Street.
Phase 1 would result Comply with all applicable None. Same as DEIS Same as DEIS Same as DEIS
in short-term delays to regulations, provisions,
local access and and construction
through traffic techniques for
(vehicles and maintaining motorized
pedestrians) on SW and non-motorized traffic
16th Street during flow and safety within and
construction. through the construction
area. (R)
July 1997
Final Environmental Impact Statement 1-19
Oakesdale Avenue S. Y.
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0) Optional Adverse Impacts (0) Optional Adverse Impacts
PARKS AND PARKS AND
RECREATION (3.10) RECREATION (2.3.10)
Alternative A,
Phases 1 and 2
Temporary closure of None proposed. Short-term impacts Same as DEIS Same as DEIS Same as DEIS
the CSTC segment of during construction.
the Springbrook
Creek Trail and CSTC
wetland trail system
during Phase 1 road-
way and bridge
construction.
Phase 1 would Relocate the affected None. Same as DEIS Same as DEIS Same as DEIS
permanently impact a segment. Relocation
segment of the closer to Springbrook
Springbrook Creek Creek will be investigated.
Trail. Coordinate relocation with
the Boeing Company, City
of Renton Parks Dept.,
and the City's ESGRW
Project. (R)
Phase 1 would Replace and relocate None known at this Same as DEIS Same as DEIS Same as DEIS
permanently remove affected segments, if time.
portions, and render feasible. Coordinate with
unusable other The Boeing Company.
portions of the CSTC (R)
wetland internal trail
system.
With Phase 1, None proposed or Users will experience Same as DEIS Same as DEIS Same as DEIS
sections of Spring- practical. an increase in noise
brook Creek trail and level.
CSTC wetland trail
system adjacent to
July 1997
1-20
FEIS
Significant Impacts, Mitigation Measures, and Unavoidable Adverse Impacts
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0) Optional Adverse Impacts (0) Optional Adverse Impacts
new roadway would
experience increased
noise levels.
VISUAL VISUAL RESOURCES
RESOURCES (3.11) (2.3.11)
Alternative A,
Phases 1 and 2
Project construction Conformance with None. Same as DEIS Same as DEIS Same as DEIS
would create short- regulations of the City of
term impacts from Renton Land Clearing
clearing of mature and Tree Cutting
trees and other Ordinance, and Mining,
vegetation. Excavation, and Grading
Ordinance. (R)
Re-seed upland areas
with perennial grass
immediately following
construction. (R)
Phase 1 and 2 would Landscaping along the Corridor visual Phases 1 and 2 Same as DEIS Same as DEIS
place elevated road- Phase 1 roadway would character would be roadways would block
way (on structure) buffer views of traffic from altered by replacement some views across
over wetlands, surrounding hillsides and of vegetation by wetlands. Vehicular
blocking some views nearby office and roadway and placing traffic, signing and
across these commercial buildings. (R) elevated bridge lighting would be visible
wetlands. Vehicular structures over from areas with views of
traffic, signing and wetlands and the project site.
lighting would be Springbrook Creek.
visible from areas with
views of the project
site.
Traffic would The use of shielded None. Same as DEIS Same as DEIS Same as DEIS
introduce light and lighting fixtures would
glare into an area reduce light and glare
where it is negligible impacts. (R)
July 1997
r ri r r r r r r r r rr r r r r r r r r
Final Environmental Impact Statement I-21
0akesdale Avenue SAV.
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0) Optional Adverse Impacts (0) Optional Adverse Impacts
or non-existent. Use trees and shrubs to
screen light and glare.
Coordinate landscaping
with adjacent property
owners. (0)
Potential for Use shielded lighting None identified
illumination impacts fixtures, particularly
on some wildlife in wetland areas.
species
HISTORIC AND HISTORIC AND
CULTURAL CULTURAL
RESOURCES (3.12) RESOURCES (2.3.12)
Alternative A,
Phases 1 and 2
Potential of detecting If archaeological sites are None. Same as DEIS Same as DEIS Same as DEIS
cultural artifacts discovered, Chapter
during soil excavation. 27.53 RCW requires that
the state OAHP be
contacted. (R)
Stop work if sites are
found and evaluate the
need for further treatment.
(0)
HAZARDOUS HAZARDOUS
MATERIALS (3.13) MATERIALS (2.3.13)
Alternative A,
Phases 1 and 2
Potential for spills and Minimize the potential Potential accidents Same as DEIS Same as DEIS Same as DEIS
leaks of hazardous release of hazardous resulting in releases to
materials during materials during soil, surface water, or
July 1997
1-22
F1 IS
Significant Impacts, Mitigation Measures,and Unavoidable Adverse Impacts
Alternative A in DEIS Refined Alternative A in FEIS
Mitigation Measures Significant Mitigation Measures Significant
Significant Impacts (R) Required Unavoidable Significant Impacts (R) Required Unavoidable
(0) Optional Adverse Impacts (0) Optional Adverse Impacts
construction and construction and ground water.
operation. operation as required by
City of Renton
regulations. (R)
July 1997
Final Environmental Impact Statement 2-1
Additional Information
2. Additional Information
2.1 Introduction
' This section presents additional information on: 1) the selection of Alternative A as the Preferred
Alternative; 2) refinements to the Preferred Alternative to further reduce its impacts; and, 3) changes in
existing conditions, impacts and mitigation measures resulting from these refinements.
' This section also includes additional information on the affected environment, impacts and mitigation
measures in response to comments received on the Draft Environmental Impact Statement(DEIS).
' For several of the elements of the environment evaluated in the DEIS, no additional information was
required.
' 2.2 Alternatives
2.2.1 Selection of the Preferred Alternative
' Of the two build alternatives (Alternatives A and C) and the No-Build Alternative, the City of Renton
has selected Alternative A as the Preferred Alternative.
' Information in the DEIS, addtional study, and comments received were used to determine that this
alternative provided the most direct route for the new roadway with the least impact on the environment;
thus, it is the best of the three alternatives in meeting the project's objectives.
' 2.2.2 Alternative A - The Preferred Alternative
Recommendations of a Value Engineering Study investigating options to further minimize impacts of the
' project(and reduce the cost of the project), discussions with the U.S. Army Corps of Engineers and other
agencies preliminary to the Section 404 Permit application process, and comments required on the DEIS
have resulted in refinements to the horizontal alignment of Alternative A. This new alignment differs
from the Alternative A alignment described in the DEIS in the following respects:
1. Beginning at the existing Oakesdale Avenue S.W. and S.W. 16th Street intersection, the new
alignment curves further to the southwest through Benaroya Company property than the DEIS
alignment, crosses Springbrook Creek about 300 feet south of S.W. 16th Street (compared to 400
feet in the DEIS alignment), and enters the Boeing Customer Service Training Center (CSTC)
' property. At this point the new alignment is approximately 90 feet west of the DEN alignment. The
new alignment then gradually curves to the south through the CSTC property and enters the Boeing
Lon-acres Office Park property continuing on a gradual curvature east of the DEIS alignment (up to
' a maximum of 40 feet to the east at S.W. 19th Street) until it matches with the DEIS alignment
approximately 800 feet south of S.W. 19th Street. (Refer to Figure 2.2.2.-1)
A 400-foot long bridge crossing both Springbrook Creek and the CSTC constructed "delta" wetland
was proposed in the DEIS. The new alignment, being shifted further to the west than the DEIS,
crosses the westernmost edge of the CSTC "delta" wetland. Filling this westernmost wetland area to
accommodate the new roadway is proposed, rather than a bridge across it, following discussions with
' the Corps of Engineers, state agencies and The Boeing Company. Shifting the DEIS alignment
further to the west also improves the skew angle at the Springbrook Creek crossing. As a result a
single-span bridge, approximately 140 feet in length, is proposed at this crossing.
City of Renton
FEIS
Oakesdale Avenue S.W.
' _- ' — - - -
r.
\,�1'.,,' ,\
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FEIS REFINED ALIGNMENT }I' �1' / ' :� _ ��_'_ '` -�'� _ f '4 I`r I( � w. 1
' n. or�0os• RIGHT-OF-WAY A(j/5'i I '�t\ r33 e:. 1�. — - ---�-: su xsuR 4000" �� . g rl �= ==wi �003000S ' �. !�,�.._n ! - - ;-.. _ _, - '� �'_. DEiS AUGNMENT� A/ lr,1I ,:.t—:�
t. 471 Sp i - i r L -` — ♦- 1 RIGHT'=OF SWAY y i 111 `I;+ •.I
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�! iL!,j Th.. K .-^- -_,•, �`'r � C.c:. ',�� I�. �, - k \?;TES.,REFINED-ALIGNMENT "A" � j -
- �... OAKESDALE:.AV-E� _ -
1 _ - T - _
GH
- 1
01.31'39'E-.. t'.. `�+! � R . . n. � N'Ot•13'lt--C<"� .1 .i in '„^�.� .- .. � ���i�-N,00'1S�i��/- .- _ _ _ �_ _ _W�Op ..� ` .�� _ . _ �:4' ,.
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T - 221 \
32' NI3, - - '^---r"--, <�r--� `.\ \ / �• ��. - I o _�.J. ���_'�V 1 I I 1
DEIS ALIGNMENT "A" 1 �- sr�I ! \\�`\_�— — _. I�� , �f r -'`_�"�"� Iw
RIGHT-OF-WAY N a.' 4a 3.L -_�=;, �, ,•' vl �r + :N _ fir_ }
b.
LEGEND
' DEIS ALIGNMENT 'A" - - - - --
RIGHT-OF-WAY
' FEIS REFINED ALIGNMENT "A"
RIGHT-OF-WAY
KIATO& 2003 Western A ven u e FIGURE 2.2.2-9 REFINED ALTERNATIVE A ALIGNMENT
' 555Market Place One
ARREN`seattle, WA 98121
INCORPORATED (206)448-4200
Final Environmental Impact Statement 2-3
Additional Information
2. The Alternative A alignment in the DEIS is maintained for a distance of about 1,250 feet, from 800
feet south of S.W. 19th Street to approximately 500 feet north of S.W. 27th Street, where the new
' alignment diverges from the DEIS alignment as it continues south to S.W. 27th Street. At S.W. 27th
Street, the new alignment is about 25 feet west of the DEIS alignment. (Refer to Figure 2.2.2-1.)
With this shift in alignment, more of the proposed project will be located on the Boeing Longacres
' Office Park property, and less on City of Renton property, than was proposed with the DEIS
alignment.
3. South of S.W. 27th Street, the refined Alternative A alignment continues south parallel to, and
' approximately 30 feet west of the DEIS alignment for about 500 feet. At this point the new
alignment gradually curves to the southeast to join existing Oakesdale Avenue S.W. at S.W. 31st
Street. (Refer to Figure 2.2.2-1.)
tA 600-foot long bridge crossing over a City of Renton wetland in this segment of the project was
proposed in the DEIS. Shifting the DEIS alignment to the west allows the new roadway to be
incorporated with the existing earth embankment that separates the City of Renton wetland on the
east from the wetland areas on the west. Filling the wetland to accommodate the remainder of the
new roadway is proposed, rather than a bridge structure over the wetland, following discussions with
the Corps of Engineers and state agencies. Replacing the existing 48-inch culvert crossing under the
existing earth embankment with a box culvert under the new roadway is proposed in order to
improve hydrology between the existing wetlands on the east and west, and to improve access
between these wetlands for wildlife.
Typical roadway cross-sections for the refined Alternative A (Preferred Alternative) are shown in Figure
2.2.2-2.
' 2.2.3 Construction Sequencing
Due to funding constraints, the proposed project's construction phasing described in the DEIS has been
modified as follows:
1. Phase I would construct the ultimate five-lane roadway with bike lanes, curb and gutter and
sidewalks on each side, and associated improvements from S.W. 16th Street to S.W. 19th Street; and
a three-lane roadway with curb, gutter, sidewalk and associated improvements on the west side from
S.W. 19th Street to S.W. 27th Street. Surface water runoff conveyance/detention/treatment systems
for the ultimate five-lane roadway between S.W. 16th Street and S.W. 27th Street would be installed
in Phase 1. Also wetland mitigation for the ultimate five-lane roadway between S.W. 16th Street and
S.W. 27th Street would be addressed in Phase 1. .
2. When funding becomes available, Phase 2 will complete the ultimate five-lane roadway and
associated improvements between S.W. 19th Street and S.W. 27th Street, and complete the extension
of Oakesdale roadway from S.W. 27th Street to S.W. 31 st Street.
' City of Renton
2-4
FEIS Oakesdale Avenue S.W.
' R/W R/W R/W R/W
45' 45' 45' 45'
ULTIMATEDIMENSIONS 4 8' ' 11' I 11' 12' 11'T 11' S'�'''T'�8'—%-4'
L SANE CENTER TURN ' S E
' LANE LANE ORMEDIAN LAA NE
I-
I—7—�
I INTERIM I 1 SHOULDER
' 8' BIKE
71 it' it' 17' 1K 8' a' 8' 12' 12' 12' a'�
BIKE BIKE DIMENSIONS
LANE LANE
PHASE 2 CONSTRUCTION
i
X
D EXISTIN
GRADE G C
EXISTING
/GRACE
-� - -- ---- --- --- — EXISTING
GRADE
7
EXIS TING
' GRADE
TYPICAL ROADWAY SECTION(PHASE 2) TYPICAL SECTION
SOUTH OF S.W.27TH ST. S.W.27TH ST.TO S.W.19TH ST.
R/W R/W
45' 45'
1.5' 6.5' S' 17' 17'—«--12' 1' 1' 5' 6.5'-- G—1.5'
BIKE MEDIAN BIKE
LANE LANE
I
8' S' 11' it' 12 17' tt' S' 8'
BIKE CENTER TURN BIKE
LANE LANE OR MEDIAN LANE
� A EXISTING
X'SDE I
— —— ———— _——
' — — —— ——— OR — 75'-2"
OR __ n SPACES AT 6'-;0"
d P?�
TYPICAL SECTION
TYPICAL BRIDGE SECTION
5Marj�prQB 200311'eslernAvenue One S.W.19TH ST.TO S.W.16TH ST. AT SPRINGBROOK CREEK
WARREN 55attie, rA 981 1
' Sea tt/e. AA 00
INCORPORATED (208)448-4200
FIGURE 2.2.2-2 REFINED ALTERNATIVE A —TYPICAL ROADWAY CROSS SECTIONS
' Final Environmental Impact Statement 2-5
Additional Information
' 2.3 Affected Environment, Impacts, and Mitigation
The revised elements of construction in Phases 1 and 2 are not significantly different from that described
in the DEIS. Therefore, changes to existing conditions, impacts, and mitigation presented in this FEIS
will be based on the existing conditions, impacts and mitigation measures associated with each phase of
the project defined in the DEIS.
2.3.1 Air Quality
No comments were received and no additional information is needed for this EIS.
2.3.2 Noise
' No comments were received and no additional information is needed for this EIS.
2.3.3 Geology and Soils
2.3.3.1 Affected Environment
No comments were received and no additional information is needed for this EIS.
2.3.3.2 Impacts
The height of embankments in Phase 2 of the refined Alternative A south of S.W. 27th Street will range
from one to ten feet rather than one to twenty feet as noted for Alternative A in the DEIS.
TABLE 2.3.3-1 EXCAVATION AND FILL QUANTITIES(CUBIC YARDS
Phase Excavation Fill
' Refined Alternative A (FEIS) 1 29,200
2 12,600
Total 41,800
Alternative A (DEIS) 1 7,800 19,140
2 0 5,700
Total 7,800 24,840
No comments were received and no other additional information is needed for the EIS as a result of the
refinements to Alternative A in this FEIS.
' 2.3.3.3 Mitigation
No comments were received and no additional mitigation measures are needed as a result of the
refinements to Alternative A in this FEIS.
City of Renton 2-6 '
FEIS Oakesdale Avenue S.W.
2.3.3.4 Impact Summary ,
Significant Unavoidable
Significant Impacts Mitigation Measures Adverse Impacts
The refined Alternative A will No additional measures needed. None.
require about 29,200 and 12,600
cubic yards of fill for Phase 1 '
and Phase 2, respectively.
2.3.4 Surface Water Quantity/Quality
2.3.4.1 Introduction
No comments were received and no additional information is needed for the EIS. '
2.3.4.2 Affected Environment
Studies and Coordination
In the DEIS, adopted FEMA 100-year flood elevations were used to compute compensatory storage
required for the proposed project. It was also noted in the DEIS that recent modeling of the Black River '
Basin watershed by the City of Renton (which includes Springbrook Creek) shows the lower reaches of
Springbrook Creek near the proposed project too be one to three feet lower than FEMA elevations.
Further review of the mofeled results by the City of Renton since issuance of the DEIS has determined ,
that the City's modeled 100-year floodplain elevations are appropriate for use in computing the volume of
compensatory storage required to mitigate for filling within the 100-year floodplain of Springbrook
Creek. Where the FEMA defined 100-year floodplain is lower than the City's model results, the FEMA
elevations are still to be used. Since FEMA elevations will be lower only in a section of Springbrook
Creek between S.W. 41st Street and S.W. 43rd Street, the City's model elevations have been used in
determining compensatory storage for the refined Alternative A in this FEIS. '
Existing Drainage Facilities
Other existing storm sewer facilities in the Oakesdale project area not identified in the DEIS include: '
• Two existing storm drain inlets with 6-inch pipe outlets to the west located on the Boeing Longacres
Office Park property; one located approximately 100 feet, and the second approximately 200 feet, ,
north of S.W. 27th Street;
• A 6-inch culvert under an existing east-west dirt road located on Longacres Off-ice Park Property '
about 1,000 feet north of S.W. 27th Street; and
• Eleven inlets with 6-inch pipe outlets drain an existing paved access road within the Boeing CSTC
property north of S.W. 19th Street. Eight inlets outlet to the CSTC "riverine" wetland on the west
side of the existing road, and three inlets outlet to the CSTC "delta" on the east side of the roadway.
2.3.4.3 Impacts
Surface Water Quantity
Table 2.3.4-1 compares the increase in impervious surface resulting from the refined Alternative A in ,
this FEIS and Alternative A in the DEIS.
' Final Environmental Impact Statement 2-7
Additional Information
' TABLE 2.3.4-1 INCREASE IN IMPERVIOUS SURFACE(ACRES)
Refined Alternative A (FEIS)
Phase 1 7.07
Phase 2 0.40
Alternative A (DEIS)
Phase 1 7.16
Phase 2 0.40
Surface Water Runoff Svstems
For the refined Alternative A in this FEIS, storm sewer systems will collect surface water runoff from all
impervious areas including sidewalks, roadways, and fill slopes at the back of the sidewalk. The grass
strip behind the curb noted for Alternative A in the DEIS has been deleted from the refined Alternative A
proposal (see typical cross-sections in Figure 2-3).
' Surface water runoff quantities have been evaluated, and a storm drainage system developed, for the
refined Alternative A according to: 1) requirements outlined in the 1990 King County Surface Water
Design Manual adopted by the City of Renton (the same as was done for Alternative A in the EIS); and,
2) requirements of the Washington Department of Ecology's Stormwater Manual for Puget Sound. For
the refined Alternative A, surface water runoff would be collected in catch basins at the roadway curbs
and conveyed in enclosed pipes to detention and/or water quality treatment facilities (no change from the
' DEIS). All treated stormwater would be discharged directly to Springbrook Creek or to wetlands
tributary to Springbrook Creek (no change from the DEIS). However, the number of drainage systems
for the refined Alternative A has been reduced from the five (A, B, C, DE and F) proposed in the DEIS to
four(A, B. C and F). The detention and water quality treatment facilities proposed for Systems B, C and
F have been changed from that proposed in the DEIS. The four drainage system concepts proposed for
the refined Alternative A are described below and shown on Figure 2.3.4-1.
' For the Phase 2 segment of the refined Alternative A in this FEIS (S.W. 27th Street to S.W. 31st Street)
drainage System A would remain unchanged from the concept described in the DEIS. Surface water
from the southern half of the Phase 2 segment would be conveyed by curb and gutter to catch basins and
a closed conveyance system. A biofiltration swale would provide water quality treatment before
outfalling into an adjacent existing wetland. System B would include the north half of the Phase 2
segment (to S.W. 27th Street) and a segment of the Phase 1 project from S.W. 27th Street to
' approximately 500 feet north of S.W. 27th Street. Surface water runoff would be conveyed by curb and
gutter to catch basins and a closed conveyance system. Water quality treatment would be provided by a
combination wetpond/biofiltration Swale facility located in an area between the proposed east side
' Oakesdale sidewalk and an existing wetland north of S.W. 27th Street. After treatment, System B would
outfall to an existing wetland south of S.W. 27th Street which would serve as a detention facility to
provide peak discharge control. (In the DEIS, peak discharge control and water quality treatment would
' have been provided by a combination wetpond/detention facility located in the existing adjacent wetland
north of S.W. 27th Street and then outfall to an existing wetland south of S.W. 27th Street. This
proposed change in System B water quality treatment and detention: 1) would reduce wetland impacts;
' 2) is possible due to shifting the refined Alternative A alignment to the west; and 3) provide runoff
treatment and control equal to or exceeding that proposed for Alternative A in the DEIS.
System C would collect surface water runoff from Phase I of the proposed project between System B
and the high point of the roadway at the south end of the bridge across Springbrook Creek, an overall
length of approximately 1,800 feet. Surface water runoff would be conveyed by curb and gutter to catch
4 „3
13
eie V�ult with �+-Nartle rdg "'
SprinjbnktiCreek
System C. W Z _r',d`Str,;q - C.D. a -- � r ✓x.'- �;..
r �''��• constructed wetland
t"(wetpond),with Y
outfall to,wetland
th-S,t
n N System B. 3
wetpond with -_
:outfall,towetland , `�
System A..
�# Ibiofiltration swale, a
with outfall to wetland
$ N a 20Q 400 800:Feet a
t rn'
R
a ter': 61i � ae
Aerial Pltotopt9 Y •-�.. -.
' City of Renton 2-9
FEIS Oakesdale Avenue S.W.
basins and a closed conveyance system running parallel under the proposed roadway. This system would
outfall into a constructed combination wetpond/biofiltration swale facility, located at the south end of
System C and adjacent to the east side of the proposed roadway, which will provide water quality
treatment. After treatment, System C surface water runoff would flow into an existing adjacent wetland
which would provide peak discharge control. System C in this FEIS: 1) combines System C and DE in
the DEIS into a single system; 2) eliminates the wetvault, biofiltration swale and outfall directly into
Springbrook Creek at S.W. 19th Street that was proposed for System DE in the DEIS; 3) eliminates the
System C combination wetpond/detention facility proposed in the DEIS; and, 4) provides treatment and
control equal to or exceeding that proposed for Alternative A in the DEIS. The revised System C
' drainage system avoids wetland impacts, minimizes direct discharge into Springbrook Creek, and
eliminates the need for an easement on private property to accommodate a wetvault, biofiltration swale
and outfall.
System F in this FEIS would collect surface water runoff from the Phase 1 project segment between the
south end of the new bridge over Springbrook Creek and S.W. 16th Street (similar to System F in the
DEIS). Surface water runoff would be conveyed by curb and gutter to catch basins and a closed
conveyance system running parallel under the proposed roadway(similar to System F in the DEIS). At a
point along the conveyance system near S.W. 16th Street the runoff would drain into a wetvault for water
quality treatment (rather than a biofiltration swale as proposed for System F in the DEIS). The wetvault
would discharge into an existing storm sewer system in S.W. 16th Street and eventually into Springbrook
Creek. Lack of space for a biofiltration Swale due to shifting the DEIS Alternative A alignment further
to the west has resulted in the water quality treatment facility proposed for System F in this FEIS.
The level of runoff treatment and control will remain unchanged from that proposed for Alternative A in
the DEIS.
Floodplain Storage
Floodplain storage impacts in the DEIS was based on FEMA 100-year peak flows and water surface
elevations along Springbrook Creek north of S.W. 27th Street. Since issuance of the DEIS, the City of
Renton has determined that the City's modeled 100-year flood event elevations can be used to compute
compansatory requirements for the proposed project.
Preliminary estimates of fill quantities for Phase I and 2 of the refined Alternative A based on Renton
modeled 100-year floodplain elevations are presented in Table 2.3.4-3. This table also includes the
estimated fill quantities for Alternative A in the DEIS (based on the FEMA 100-year floodplain
elevations).
1
City of Renton 2-10 '
FEIS Oakesdale Avenue S.W.
i
TABLE 2.3.4-2 FLOODPLAIN STORAGE IMPACTS
(Cubic Yards of Displacement)
Refined Alternative A Alternative A
(FEIS) (DEIS) '
Phase 1 Phase 2 Phase 1 Phase 2
100-Year Renton modeled 1,380 8,500 — — '
floodplain impact
100-Year FEMA floodplain impact — — 330 3,770
Bridge Piers in the Floodwav
Phase 1 of the refined Alternative A in this FEIS includes a 140-foot long single-span bridge across
Springbrook Creek. This bridge would be designed to provide a minimum clearance of two feet above
the City of Renton 100-year floodplain elevation at the crossing of Springbrook Creek. (A minimum '
clearance of three feet was provided in the DEIS.) Since issuance of the DEIS, the City of Renton has
reviewed the minimum clearance requirement and has lowered it to two feet for this Oakesdale Avenue
S.W. project in recognition of the benefits that a single-span bridge with no piers in the low flow channel
would have to channel capacity during conveyance condition flows.
The proposed single-span bridge would be located so that the bridge abutments would not encroach into ,
the future land use 100-year conveyance event flow and, therefore, would not increase the water surface
elevation upstream under this 100-year conveyance event. (The bridge proposed in the DEIS would have
increased the water surface elevation by 0.1 feet at the upstream edge of the bridge under this 100-year
conveyance event condition.) Also, the Phase 1 refined Alternative A bridge across Springbrook Creek
would not require compensatory storage for the future land use 100-year storage event. The 100-year
storm event flow velocities under this single-span bridge are anticipated to be sufficient to cause channel ,
scour, or erosion, at the abutments. (Channel scour was also identified as a potential impact in the
DEIS). Surface protection (e.g. rip-rap) under the bridge at the abutments would prevent channel
erosion. ,
Phase 2 of the refined Alternative A does not include a bridge structure. Therefore, the bridge
pier/abutment potential impact noted in the DEIS would not occur in the refined Alternative A in this
FEIS. '
Groundwater
As with Alternative A in the DEIS, Phases 1 and 2 of the refined Alternative A in this FEIS could impact ,
subsurface hydrology and groundwater. Phases 1 and 2 of the modified Alternative A are anticipated to
add 7.07 acres and 0.4 acres, respectively, of impervious surface. The conversion of areas of absorptive
surface soils to impervious surfaces could result in some loss of infiltration to groundwater. '
Existing Drainage Facilities
The existing 12-inch pipe which conveys surface water runoff from the former stable area on Longacres '
Office Park property to the east into an existing wetland area at the south end of the former practice track
Final Environmental Impact Statement 2-11
Additional Information
area. The Phase 1 roadway embankment proposed for the refined Alternative A in this FEIS would cover
the inlet of this pipe (as would Alternative A in the DEIS). To prevent impacts to the adjacent property,
the refined Alternative A proposes to install a new pipe from the existing catch basin on the west side of
the new roadway to a new catch basin and outfall pipe on the east side of the new roadway, which will
then discharge into the existing wetland. (In the DEIS, the existing catch basin on the west side of the
' new roadway would have been replaced and a new pipe installed along the west side to convey flow to
the north to connect to an existing pipe system which discharges to the east into the middle of the former
practice track.) The inlet of the existing 12-inch pipe system discharging into the middle of the former
practice track will be covered by new roadway embankment proposed for the refined Alternative A. To
prevent impacts to adjacent property, a new inlet will be installed on the west side of the new roadway to
collect off-site runoff and connected to the existing pipe. A second catch basin will be installed in line
' with the existing pipe as part of the proposed project's storm drainage system. This catch basin would be
designed to allow the existing 12-inch pipe to pass through it and continue to discharge into the former
practice track as it does currently. (In the DEIS, replacement of the existing pipe under the new roadway
was proposed.) A third existing pipe at the north end of the former practice track would also be impacted
' by Phase 1 of the refined Alternative A (similar to Alternative A in the DEIS). The need for replacement
of this pipe will be coordinated with The Boeing Company.
' The three existing inlets with outlet pipes located on Longacres Office Park property north of S.W. 27th
Street will be covered with new roadway embankment proposed in the refined Alternative A. These
inlet/pipe systems will be relocated or removed in coordination with The Boeing Company.
The existing access road on the CSTC property north of S.W. 19th Street will be removed by Phase 1 of
the refined Alternative A (similar to Alternative A in the DEIS). Therefore, the numerous inlet/pipe
' systems draining runoff from it will no longer be needed. Any offsite flows from areas on the CSTC
property adjacent to the new roadway can be directed to the CSTC delta wetland on the east side of the
new roadway without any further independent storm drains under the new roadway.
Surface Water Quality
For Phases 1 and 2 of the refined Alternative A in this FEIS, surface water runoff from the new
impervious surfaces would be subject to water quality treatment either by biofiltration swales, a
constructed wetland surface water mitigation facility, or wetvault. See previous additional information
under Surface Water Quality.
' Impacts During Construction
Bridge construction at the Springbrook Creek crossing and within the existing adjacent Boeing CSTC
' wetland (proposed in Phase 1 of the refined Alternative A in this FEIS) will require Hydraulic Project
Approval (HPA) from the Washington Department of Fish and Wildlife (WDFW). Potential impacts to
the creek and wetland include sedimentation, turbidity, and erosion associated with construction adjacent
' to, and within, the creek and wetland (similar to Alternative A in the DEIS). Any impacts to
Springbrook Creek will be addressed by HPA permit conditions. Construction of the Phase 2 fill and
roadway (south of S.W. 27th Street) proposed in the refined Alternative A will also have potential impact
' on the adjacent existing wetland areas, including sedimentation, turbidity, and erosion (similar to
Alternative A in the DEIS).
Impacts of Operation
Phase 1 of the refined Alternative A in this FEIS will cross Springbrook Creek and pass adjacent to
wetlands along a portion of its length. The Phase 1 roadway will be constructed on retained fill where it
City of Renton 2-12 '
FEIS Oakesdale Avenue S.W.
passes through the Boeing CSTC wetland and on earth embankment adjacent to other wetland areas. The '
eastern half of the Phase 2 roadway will also be constructed on retained fill where it crosses over the City
of Renton wetland. The western half of this roadway will be constructed on the existing earth
embankment adjacent to existing wetland areas. Surface water runoff from the existing and new ,
roadway embankment, which normally slope between 25 and 33 percent, could introduce sediment to
Springbrook Creek and adjacent wetland areas. Generally, the distances to these receiving waters would
be short, thereby potentially increasing the amount of sediment entering these receiving waters because ,
of less chance of filtering before discharge. Relatively small sedimentation impacts at each location
could result in cumulative impacts to Springbrook Creek (similar sedimentation impacts were identified
for Alternative A in the DEIS).
Water quality treatment facilities (biofiltration swales, combination wetpond/biofiltration Swale
facilities, or wetvault) proposed for Phases 1 and 2 of the refined Alternative A in this FEIS should
remove a high percentage of pollutants (such as fuel, oils, grease and metals) that could be generated by
traffic using the new roadway. Water quality treatment facilities are not 100% effective in removing all
pollutants; therefore, a small percentage of pollutants could remain suspended in the surface water ,
leaving the refined Alternative A corridor and eventually entering Springbrook Creek and receiving
wetlands. Pollutant removal efficiency would be reduced for storms greater than the 2-year, 24-hour
event. '
With Phases 1 and 2 of the refined Alternative A, there would be the potential for warmer storm water
runoff reaching Springbrook Creek. This would be the result of storm runoff from hot pavement areas
and from detention in wetland areas without adequate shading features. ,
Comments received have been addressed in this FEIS and no other additional information on impacts is
needed for this EIS. ,
Cumulative Impacts
No comments were received and no additional information resulting from the refinements to Alternative
A is needed for this EIS.
2.3.4.4 Mitigation
Surface Water Quantitv
Surface water runoff from Phase 1 and 2 of the refined Alternative A in this FEIS would be collected and ,
conveyed to existing wetland areas or directly to Springbrook Creek. Prior to entering wetland areas or
Springbrook Creek, water quality treatment will be provided through biofiltration swales, combination
wetpond/biofiltration swale facilities, and wetvault; and, peak runoff control will be provided through '
detention in existing wetland areas. Analysis and design of the conveyance system, and water quality
treatment and detention facilities will comply with the requirements of: the 1990 King County surface
Water Design Manual adopted by the City of Renton; the Washington Department of Ecology's '
Stormwater Manual for Puget Sound; and, other applicable local, state and federal regulations.
For the refined Alternative A in this FEIS, loss of flood storage associated with the placement of fill in
the 100-year tloodplain will be mitigated through compensatory excavation on a one-to-one basis per '
City of Renton requirements (similar to Alternative A in the DEIS). 1,380 and 8,500 cubic yards of
storage would have to be provided for Phases 1 and 2, respectively, of the refined Alternative A. These
quantities are based on flood elevations established by the City of Renton after further review (since
issuance of the DEIS) of recent hydrologic modeling. (See previous additional information under
Studies and Coordination.) Measures to provide the compensatory storage required for Phase 1 of the
Final Environmental Impact Statement 2-13
Additional Information
' refined Alternative A will include excavation associated with construction of wetland replacement to
mitigate Phase 1 wetland impacts. Measures to provide the compensatory storage required for Phase 2 of
the refined Alternative A will include excavation associated with construction of wetland replacement to
mitigate Phase 2 wetland impacts and, if necessary, at other sites within the Springbrook Creek drainage
basin.
' For Phase 1 of the refined Alternative A, potential increase in water surface elevation during the 100-
year frequency storm event resulting from the proposed bridge over Springbrook Creek has been
eliminated through the type of bridge selected (single-span with abutments out of the 100-year
' conveyance flow) and widening of the channel under the bridge as part of the Phase 1 construction. No
additional mitigation is required.
Groundwater
No comments were received and no additional mitigation measures are required to address impacts
' associated with refinements to Alternative A in this FEIS.
Existing Drainage Features
' Due to the shift in alignment of the refined Alternative A in this FEIS, impacts on the existing Boeing
CSTC outlet control vault structure will be avoided. Therefore, relocation will no longer be required.
Other mitigation proposed for Alternative A in the DEIS is applicable to the refined Alternative A in this
FEIS.
No comments were received and no additional mitigation measures are required for this EIS.
Surface Water Qualitv
Surface water runoff from Phases 1 and 2 of the refined Alternative A in this FEIS will receive water
' quality treatment through biofiltration swales, wetponds, constructed wetland/surface water treatment
facility, and wetvault. These facilities will comply with the requirements of the 1990 King County
Surface Water Design Manual adopted by the City of Renton and the Washington Department of
' Ecology's Stormwater Manual for Puget Sound.
Other mitigation proposed for Alternative A in the DEIS is applicable to the refined Alternative A in this
' FEIS.
Comments received are addressed above and no additional mitigation measures are required to address
impacts associated with the refinements to Alternative A.
' During Construction
No comments were received and no additional mitigation measures are required to address impacts
associated with the refinements to Alternative A.
Operation
For Phases 1 and 2 of the refined Alternative A in this FEIS, water quality treatment facilities
(biofiltration swales, wetponds, constructed wetland/surface water treatment facility and wetvault)
should remove a high percentage of fuel, oils, grease and metals potentially generated by traffic using the
proposed roadway. Revegetation and landscape treatment should reduce soil erosion and sediment
problems associated with the runoff from embankments created by Phases 1 and 2 of the refined
Alternative A in this FEIS. Planting trees and vegetation around the wetponds and constructed
City of Renton 2-14 '
FEIS Oakesdale Avenue S.W.
wetland/surface water treatment facility could reduce the temperature of surface water runoff before it '
enters wetland areas or Springbrook Creek.
No comments were received and no additional mitigation measures are required to address impacts '
associated with the refinements to Alternative A.
Unavoidable Adverse Impacts ,
The water quality treatment facilities proposed for Phases 1 and 2 of the refined Alternative A in this
FEIS will not be 100% efficient in removing all pollutants from surface water runoff from the project
site. A small percentage of pollutants could eventually enter the receiving waters (wetlands and '
Springbrook Creek). Also, pollutant removal efficiency for large storms (e.g. 2-year, 24-hour event)
would be reduced as flows increase. This would be an unavoidable impact during project construction
and from vehicular traffic operating on the completed roadway.
Even with mitigation, there could be some loss of infiltration to the groundwater due to the increase in
impervious area in Phase 1 of the refined Alternative A in this FEIS. ,
2.3.4.5 Impact Summary
Significant Unavoidable '
Significant Impacts Mitigation Measures Adverse Impacts
Surface Water Quantity
For Phases 1 and 2 of the refined All measures in DEIS are applicable. None '
Alternative A, fill within the City of No additional measures required.
Renton 100-year floodplain would
result in the loss of 1,380 and 8,500
cubic yards, respectively, of flood
storage.
For Phases I and 2 of the refined Analysis and design of surface water Some loss of infiltration to '
Alternative A, increased surface runoff conveyance system, and peak groundwater,due to increased
water runoff due to the addition of discharge control, per King County impervious area. '
7.07 and 0.40 acres,respectively, of Surface Water Design Manual
impervious surface. (KCSWDM)adopted by the City of
Renton and Department of
Ecology's Stormwater Manual for '
Puget Sound.
Interruption of existing surface Mitigation measure in the DEIS is None
water flow patterns and conveyance applicable. No additional measures '
systems in Phase 1 of the refined required.
Alternative A.
The refined Alternative A in this FEIS avoids relocation of the Boeing CSTC wetland/detention outlet control
structure. Therefore, mitigation proposed in DEIS is no longer necessary.
The bridge proposed in Phase 1 of the refined Alternative A in this FEIS does not increase the upstream water '
surface in Springbrook Creek. Therefore, mitigation proposed in the DEIS is no longer necessary.
a
Final Environmental Impact Statement 2-15
Additional Information
Significant Unavoidable
Significant Impacts Mitigation Measures Adverse Impacts
Surface Water Quality
Potential for increased sediment, Provide water quality treatment per Percentage of pollutants from the
nutrient loads, and contaminants the 1990 KCSWDM adopted by the project site could enter receiving
' reaching wetlands and Springbrook City of Renton, and the Department waters.
Creek during and following of Ecology's Stormwater Manual for
construction of Phases 1 and 2 of the Puget Sound.
refined Alternative A.
All other measures in the DEIS are
applicable. No additional measures
required.
' For Phases 1 and 2 of the refined Mitigation measure proposed in None
Alternative A, potential for warm DEIS is applicable.
stormwater runoff reaching
Springbrook Creek.
2.3.5 Wetlands
' 2.3.5.1 Introduction
No comments were received and no additional information is needed for this EIS.
2.3.5.2 Affect Environment
An 0.08 acre area located north of the former practice track on the Boeing Longacres Office Park
property and east of the refined Alternative A corridor was identified in the DEIS as a wetland. Since
issuance of the DEIS, the Corps of Engineers has visited this wetland and determined it is on fill, and,
therefore, will not be a regulated wetland under the City's jurisdiction. The City of Renton also visited
this wetland area and determined that this area is drainage ditch, and, therefore, will not be regulated
wetland under the City's jurisdiction. Any impacts to this non-regulated wetland area as a result of the
' refined Alternative A are not evaluated in this FEIS.
No comments were received and no other additional information is needed for this EIS.
' 2.3.5.3 Impacts
Proiect Construction Overview
Construction of the extension of Oakesdale Avenue S.W. as proposed under the refined Alternative A in
this FEIS would involve clearing, grading, filling, and paving (the same as Alternative A in the DEIS).
In addition, a bridge would be constructed over Springbrook Creek and the existing wetland adjacent to
' the west side of the creek. As currently proposed this bridge would be a single-span, 140-foot long
structure with a width of 82 feet. Construction of this bridge would require placement of fill for the
approaches. South of the bridge the new roadway would pass over the west edge of the existing Boeing
' CSTC constructed "delta" wetland on a retained fill. (For Alternative A in the DEIS, a bridge continued
over the CSTC delta wetland resulting in a multi-span, 400-foot long structure.) At the south end of the
Oakesdale project (S.W. 27th Street to S.W. 31st Street), the roadway in the refined Alternative A would
pass through existing City of Renton wetlands E and F (see Figure 2.3.5-1). An existing road
embankment running parallel to the new Oakesdale roadway would be incorporated with a retained fill
along the western edge of Wetlands E and F to support the new road. The roadway in this segment of the
City of Renton 2-16 '
FEIS Oakesdale Avenue S.W.
project would have an overall width of 70 feet, including curbs, gutters and sidewalks. Removal of the '
existing culvert under the existing embankment and replacing it with a box culvert is proposed.
(Alternative A in the DEIS proposed a 600-foot long, multi-span structure over a major portion of
Wetlands E and F and removal of the existing road embankment.) '
In discussions with regulatory agencies, it was recognized that shading of wetlands constitutes in impact
comparable with filling. For each type of impact (filling or shading), mitigation would be required in the '
form of replacement by means of constructed wetlands. The replacement ration depends only upon the
quality of the wetlands disturbed, and, for a given quality of wetland, is no different for wetlands
disturbed by shading than for wetlands disturbed by filling. I
Retaining walls are proposed as a part of the roadway design for the refined Alternative A. Two sections
of retaining wall are proposed to minimize roadway embankment within the CSTC delta wetland and
Wetlands E and F, one other section of retaining wall is proposed to minimize roadway fill adjacent to '
the existing CSTC "riverine" wetland.
Stormwater facilities also would be constructed as part of the Oakesdale project. For the refined '
Alternative A, four stormwater systems are proposed. Water quality treatment and detention facilities
will be constructed as a part of these systems and will be located to avoid or have minimal impact on
wetland areas. Section 2.3.4 provides additional information on the stormwater systems and facilities '
and the project's effects on surface water quantity and quality.
The project as proposed for the refined Alternative A in this FEIS would be constructed in two phases.
Phase 1 will construct the ultimate five-lane roadway, bridge and associated improvements between S.W.
16th Street and S.W. 19th Streets and construct a three-lane roadway and associated improvements on
the west side only between S.W. 19th Street and S.W. 27th Street. The wetland along the west side of
Springbrook Creek, the CSTC delta wetland; and, Wetland C and D (see Figure 2.3.5-1) would be
indirectly affected, by Phase 1 surface water treatment and created wetland construction of the refined
Alternative A.
Phase 2 would complete the ultimate five-lane roadway proposed between S.W. 19th Streets and S.W. '
27th Streets and would extend Oakesdale Avenue S.W. between S.W. 27th Street and S.W. 31st Street.
Mitigation for wetland impacts of the Phase 2 construction between S.W. 19th Street and S.W. 27th '
Street would be mitigated under Phase 1. South of S.W. 27th Street, Wetland areas E and F would be
directly affected, and Wetland G and the abutting south marsh to the north would be indirectly affected
by Phase 2 construction. The existing earth embankment in this section of the project would not be '
removed (as proposed for Alternative A in the DEIS), but would support a portion of the new Phase 2
roadway.
As noted earlier in this section, construction of the roadway proposed for the refined Alternative A would '
require some wetland areas to be filled. The bridge across the Springbrook Creek and the wetland
adjacent to the west side of the creek will also create shading impacts.
Table 2.3.5-1 presents the amount of wetland area that would be filled or shaded by the refined '
Alternative A in this FEIS and Alternative A in the DEIS. Table 2.3.5-1 also presents the classification
of the filled or shaded wetlands as defined by the City of Renton Wetlands Management Ordinance. '
Final Environmental Impact Statement 2-17
Additional Information
FIGURE 2.3.5-1 DELINEATED WETLANDS
' O
1-405 -------
�S� Gor
74
/ ��
S.W.1 6th St.
No Wetlands Found y 3
Refined Alternative A In
Q
"Delta'
CSTC 1 - � E
0
Site 'Rivarl
S.W.I 9tk St.
r c' ,
E .
r gi Longacres
c a
of Office Park --zi!
Site
Z,
c --
0
Wetland C
Phase 1
Area proposed for
project mitigation
of wetland impact
it da.[.ncl
S.W.27th St.
Wetland E
1
r : 1.�. Boeing Co.Property Line eland F
City Owned . ......
W
edond V
Phase 2
Area proposed for
project mitigation
of wetland impact
V3
r a
NOTE:Wetland locations are approximate.
LEGEND:
............. Flagged Wetland Edges
0 800 M7 — Wetlands Extend Outward
Scale in Feet
City of Renton 2-18 '
FEIS Oakesdale Avenue S.W.
TABLE 2.3.5-1 CALCULATION OF WETLAND AREA FILLED OR SHADED '
Refined Alternative A Alternative A (DEIS)
(FEIS)
Wetland Area Renton Classification Area Filled or Shaded t
Area Filled or Shaded (acres)
(acres)
Phase 1
Adjacent to Springbrook 3 .043 .043
Creek ,
CSTC Delta 3 .240 .290
C 3 .025 .085 '
D 3 0 .219
Phase 1 Total 308 .637 '
Phase 2
E/F 1 1.010 1.520 '
Some wetland buffer encroachment will occur as a result of the construction of the refined Alternative A.
In Phase 1, fill within the buffer area of the wetland adjacent to Springbrook Creek and CSTC delta
wetland. Construction of a combination wetpond/biofiltration swale facility within the Wetland D buffer '
Phase I of the refined Alternative A would pass adjacent to east edge of the CSTC riverine wetland. A
retaining wall could be provided to prevent roadway embankment from encroaching into this wetland '
area. (A similar impact was noted for Alternative A in the DEIS)
The potential impacts to wetlands resulting from activities conducted during construction of Phases 1 and
2 of the refined Alternative A would be similar to the impacts identified for Alternative A in the DEIS, '
except that potential erosion and sedimentation impacts could be less during construction of Phase 2 of
the refined Alternative A, since the existing earth embankment will not be removed as proposed for
Alternative A in the DEIS. '
Affects on wetlands from stormwater facilities would be less with the refined Alternative A. Wetlands
C, D, and the wetland adjacent to Springbrook Creek would not be directly impacted by water quality '
treatment facilities as was noted for Alternative A in the DEIS. Wetlands E, F, G and the south marsh
would receive an increased amount treated water from Phases 1 and 2 of the refined Alternative A
(similar to Alternative A in the DEIS) because they are currently hydrologically connected. The impact
of this increase should not be as great as noted for Alternative A in the DEIS since the existing earth
embankment separating these wetlands will be left in place with a box culvert replacing the existing pipe
culvert under the existing embankment. Stormwater runoff that currently flows to Wetlands C and D '
would continue to do with the stormwater facilities proposed for Phase 1 of the refined Alternative A.
(For Alternative A in the DEIS, this runoff would have been intercepted by Phase 1 stormwater facilities
which could have an affect on Wetland C and D hydrology.)
' Final Environmental Impact Statement 2-19
Additional Information
No comments were received and no additional information on impacts to wetlands is needed for this EIS.
' 2.3.5.4 Conceptual Mitigation
Construction of bridges over wetlands is not proposed for the refined Alternative A in this FEIS. The
shading effects on wetlands from bridges result in the same mitigation measures as if they are filled, and
bridges are not a cost effective alternative to minimizing wetland impacts. The alignment of the refined
Alternative A presented in this FEIS avoids wetland areas to the maximum extent possible so that the
impacts from placement of fill within them to support the new roadway will be minimized.
Removal of the existing earth embankment south of S.W. 27th Street is no longer proposed as part of the
roadway project under the refined Alternative A, thus avoiding any potential impacts to the existing
wetlands on each side of the embankment that could result from a reduction in water level. A box
culvert is proposed under the existing embankment and new fill embankment to improve hydrology and
provide access for wildlife between the adjacent wetlands.
Wetland impacts of the refined Alternative A in this FEIS will be addressed through compensatory
mitigation (as was proposed for Alternative A in the DEIS). Replacement of wetlands will comply with
the requirements of the City of Renton's Wetlands Management Ordinance. Table 2.3.5-2 summarizes
the required replacement for mitigating wetland impacts of the refined Alternative A. These values are
based on wetland category, vegetation community, and replacement ratios determined for the DEIS. As
part of the created wetlands, buffers will be provided to mitigate for impacts to existing wetlands.
TABLE 2.3.5-2 WETLAND REPLACEMENT FOR REFINED ALTERNATIVE A
Area of
Wetland Vegetation Area Filled Wetland Replacement
Wetland Area Category Type (acres) Replacement Wetlands
Ratio (acres)
Phase 1
Construction
' Adjacent to
Springbrook
Creek
3 .043 1.5:1 .065
Mitigation
CSTC 3 Wetland 240 1.5:1 .360
C 3 Emergent .025 1.5:1 .038
Phase 1 Total 0.308 .463
Phase 2
Construction
' E/F 1 Emergent Scrub- 1.010 3:1 3.030
Shrub
' As indicated in Table 2.3.5-2, approximately 0.46 acres of replacement wetland would be needed to
compensate for wetland impacts as a result of Phase 1 construction for the refined Alternative A in this
i
City of Renton 2-20
FEIS Oakesdale Avenue S.W.
FEIS, and approximately 3 acres of replacement wetland would be needed as a result of Phase 2
construction for the refined Alternative A in this FEIS.
The open field located between the proposed Phase I roadway and Wetlands C and D (see Figure 2.3.5- '
I) identified in the DEIS as the site for Phase I mitigation of Alternative A in the DEIS, will be used for
mitigation Phase 1 wetland impacts of the refined Alternative A in this FEIS.
Property acquired by the City of Renton specifically for wetland mitigation that is located west of
existing Oakesdale Avenue S.W. and abutting the south edge of Wetland G (see Figure 2.3.5-1) is
proposed for mitigation of Phase 2 wetland impacts of the refined Alternative A in this FEIS. Per
conditions of purchase, this site can only be used for wetland mitigation and open space. The site north
of S.W. 27th Street proposed for Phase I wetland mitigation is another potential option for partial or full
Phase 2 wetland mitigation, depending on final wetland replacement requirements approved by the City
of Renton, Corps of Engineers, and all other federal, state and local agencies with jurisdiction during the
design process, and the availability of area at the site.
Removal of the existing earth embankment south of S.W. 27th Street is not proposed in the refined
Alternative A in this FEIS. Therefore, this removal as a mitigation measure for impacts on Phase 2
wetland functions (as proposed in the DEIS) is no longer an option for the refined Alternative A.
Comments were received but no additional mitigation measures are needed to address impacts associated
with the refinements to Alternative A in this FEIS.
2.3.5.5 Impact Summary
Significant Unavoidable
Significant Impacts Mitigation Measures Adverse Impacts
Refined Alternative A,
Phases 1 and 2
Potential temporary loss of Minimize and mitigate for loss None.
wetland acreage and functional of wetland as required by the
values as a result of filling and City of Renton. ( R)
shading. ,
Activities affecting wetlands
likely subject to Sections 401
and 404 of the Federal Clean
Water Act. ( R)
( R) Required mitigation
( 0 ) Optional mitigation
No comments were received and no other additional information is needed for this EIS.
2.3.6 Wildlife, Vegetation, and Fisheries
2.3.6.1 Affected Environment
Wildlife
Numerous swallows nested in the barns once standing on the Longacres Office Park property. ,
i
' Final Environmental Impact Statement 2-21
Additional Information
' The grassy areas and wetland pastures of the open fields provide foraging habitat for raptors. These
areas will be lost as development impact increases.
' Fisheries
According to a comment on the DEIS from the Washington Department of Fish and Wildlife, Dolly
Varden do not use Springbrook Creek.
No other additional information on the affected environment is needed in this EIS.
' 2.3.6.2 Impacts
Refined Alternative A Construction Overview
Construction of the refined Alternative A in this FEIS will involve clearing, grading, filling, and paving.
At the north end of the project, a single-span bridge, 140-feet long would be constructed over
Springbrook Creek and an existing wetland adjacent to the west side of the creek. The new roadway
' would cross over the western edge of the CSTC delta wetland on retained fill. At the south end of the
project (south of S.W. 27th Street), the roadway would cross City of Renton wetlands, partially on an
existing earth embankment adjacent to the wetlands, and partially on new retained fill. Retaining walls
are proposed at other locations to minimize roadway fill encroachment on other existing wetland areas.
Four stormwater systems will be constructed with water quality treatment and peak discharge control
features.
As noted above, the existing earth embankment south of S.W. 27th Street will not be removed as part of
the refined Alternative A construction. This removal was proposed for Alternative A in the DEIS to
1 provide partial mitigation for loss of flood storage.
Phase 1 construction and Phase 2 construction of the refined Alternative A have been revised from the
DEIS. See Section 2.2.3, Construction Sequencing, in this FEIS.
Vegetation and Wildlife
Table 2.3.6-1 presents the approximate amount of vegetation, or habitat, that would be lost as a result of
the refined Alternative A in this FEIS and Alternative A in the DEIS. Differences in impacts would
occur due to the different roadway alignment, particularly in the northern portion of the project area
(Figure 2.2.2-1 in this FEIS).
Construction of Phase 1 of the refined Alternative A within the Springbrook Creek riparian corridor
would result in 0.4 acres of habitat loss. This includes vegetation removal along the banks of
Springbrook Creek for construction of the bridge over the creek and for placement of fill for construction
of the roadway approaches at each end of the bridge.
On the CSTC wetland mitigation site, approximately 0.8 acres of vegetation and wildlife habitat would
' be lost by placement of fill for the construction of the Phase 1, refined Alternative A roadway within the
delta wetland and upland area. Construction in the CSTC wetland mitigation site could require
temporary and permanent relocation of several bird nesting structures. These features could be relocated
' to other areas of the wetland for reuse by the same bird species.
Construction of the Phase 1, refined Alternative A roadway and stormwater treatment facilities would
require removal of approximately 2.6 acres of open field habitat. Impacts on vegetation and wildlife
would be similar to those identified for Alternative A in the DEIS.
City of Renton 2-22 ,
FEIS Oakesdale Avenue S.W.
TABLE 2.3.6-1 ESTIMATED HABITAT LOSS ,
Acres Removed
Habitat Community Refined Alternative A Alternative A '
(FEIS) (DEIS)
Phase 1 ,
Springbrook Creek Riparian Corridor 0.4 0.7
CSTC Wetland Mitigation Site 0.8 0.4 '
Open Field 2.6 2.8
Phase 2
South Wetlands 1.1 1.1
Southern Forest 0.7 0.7
Total (Phases 1 and 2) 5.6 5.7
Approximately 1.1 acres and 0.7 acres of wildlife habitat in the south wetlands and southern forest,
respectively, would be lost as a result of construction of the Phase 2, refined Alternative A roadway
(unchanged from the DEIS). The placement of fill within the wetlands for construction of the roadway
would account for most of the vegetation removal and habitat loss in these two areas, and reduce the
available habitat for those species dependent on wetland and forest habitat (impacts remain unchanged
from the DEIS).
Wetland loss as a result of filling and grading associated with the construction of Phases 1 and 2 of the
refined Alternative A would have the same impacts on small mammals and amphibians as noted for
Alternative A in the DEIS.
Impacts on wildlife species and habitat, and nesting and feeding disruption due to noise and activities
associated with construction of Phases I and 2 of the refined Alternative A would be unchanged from
those identified for Alternative A in the DEIS.
No comments were received and no additional information is needed for the EIS.
Aquatic Resources ,
No comments were received and no other additional information is needed for the EIS.
Impacts of Operation
The existing earth embankment in the south wetlands and southern forest will not be removed as part of
Phase 2 of the refined Alternative A in this FEIS. The new wider, Phase 2 roadway and traffic flow on it
would pose a larger obstacle for wildlife movements. The new roadway would not be a total barrier as a '
box culvert under the new and existing embankment is proposed to provide access between the adjacent
wetlands for wildlife.
Final Environmental Impact Statement 2-23
Additional Information
' At the north end of the project, Phase I of the refined Alternative A would not divide the open CSTC
wetland mitigation site as much as Alternative A in the DEIS, and, therefore could create less of a barrier
to wildlife.
Other operational impacts on wildlife, and on aquatic resources, resulting from Phases 1 and 2 of the
refined Alternative A would remain unchanged from those identified for Alternative A in the DEIS.
No comments were received and no other additional information is needed for this EIS.
2.3.6.3 Mitigation
Comments were received but no additional mitigation measures are required as a result of these
comments, or as a result of impacts associated with the refined Alternative A in this FEIS.
2.3.6.4 Impact Summary
Significant Unavoidable
Significant Impacts Mitigation Measures Adverse Impacts
Creation of a barrier to wildlife Box culvert in Phase 2 project Creation of a barrier to some
movements will allow some wildlife wildlife species.
movement under the new
roadway.
Comments were received but no additional information is required as a result of these comments, or as a
result of impacts associated with the refined Alternative A in this FEIS.
2.3.7 Land and Shoreline Use
2.3.7.1 Affected Environment
' No comments were received and no additional information is needed for this EIS.
2.3.7.2 Impacts
Phase 1 of the refined Alternative A in this FEIS is currently scheduled for construction in 1998 in order
to be operational in time to serve new development on the Boeing Longacres Office Park property
(which is scheduled to be completed in the fall of 1998). Construction of Phase 2 of the refined
Alternative A will occur as soon as funding becomes available.
Impacts on Current and Planned Land Uses
ITable 2.3.7-1 presents estimated land acquisition for Phases 1 and 2 of the refined Alternative A in this
FEIS and for Alternative A in the DEIS.
Phase 1 of the refined Alternative A would impact a parking area on the Benaroya Company property
(unchanged from impact noted for Alternative A in the DEIS).
Phase 1 of the refined Alternative A would impact more of the CSTC delta wetland area and less of the
adjacent upland grassy area, than Alternative A in the DEIS. The refined Alternative A proposes to fill
the wetland area required for the project. Therefore, acquisition of right-of-way will be required.
(Alternative A in the DEIS proposed a bridge over the delta wetland to allow existing land use to
continue which may have required only a permanent easement for the new roadway.
City of Renton 2-24 '
FEIS Oakesdale Avenue S.W.
TABLE 2.3.7-1 LAND ACQUISITION REQUIREMENTS(ACRES) '
OWNER REFINED ALTERNATIVE A ALTERNATIVE A
(FEIS) (DEIS)
Phase 1 '
Benaroya Company 0.40 0.50
Boeing CSTC 1.50 1.50 ,
Boeing Longacres Office Park 3.80 3.60 ,
City of Renton 3.70 3.90
City of Seattle 0.21 0.21 '
Phase 2
Boeing Longacres Office Park 0.50 0.00
City of Renton 1.90 2.40
Note: a Right-of-way easement
Land acquisition requirements are estimates based on preliminary plans for roadways, structures and
stormwater facilities.
Shifting the Phase 1 roadway alignment further to the west near S.W. 27th Street, as proposed by the
refined Alternative A, will impact 0.2 acre more of Boeing Longacres Office Park property than '
anticipated with Alternative A in the DEIS. This will reduce the developable area of this site slightly
more than Alternative A in the DEIS.
City-owned property adjacent to the north side of Springbrook Creek to be acquired for Phase I of the ,
refined Alternative A would be used for roadway (bridge) purposes. (In the DEIS, this property was also
to be used for a biofiltration swale.) City-owned property just north of S.W. 27th Street to be acquired
for Phase 1 of the refined Alternative A would be used for roadway, stormwater facilities and wetland '
mitigation (unchanged from the DEIS).
Phase 1 of the refined Alternative A will no longer require permanent easements from the Boeing
Longacres Office Park and Hunter Douglas (formerly Winmar, Inc.) properties for stormwater facilities.
Shifting the Phase 2 roadway alignment further to the west south of S.W. 27th Street, a's proposed by the
refined Alternative A, will impact 0.5 acres of Boeing Longacres Office Park property (no impact was
anticipated by Alternative A in the DEIS). Most of this property is an existing earth embankment
supporting a paved access road which the refined Alternative A proposes to widen, after removal of the
road paving, with a retained fill extending into the abutting City-owned wetland area. (Alternative A in
the DEIS proposed a bridge and fill for the roadway approaches totally within City-owned property.)
Impacts on existing and planned developments in the land use study area as result of Phases I and 2 of '
the refined Alternative A are the same as identified for Alternative A in the DEIS.
No comments were received and no other additional information related to impacts on current and
planned land uses is needed for this EIS.
' Final Environmental Impact Statement 2-25
Additional Information
' Impacts During Construction and During Operation
No comments were received and no additional information is needed for this EIS.
' Cons]stencv with Plans, Policies, and Regulations
No comments were received and no additional information is needed for this EIS.
' 2.3.7.3 Mitigation Measures
No comments were received and no additional information is needed for this EIS.
2.3.7.4 Impact Summary
No comments were received and no additional information is needed for this EIS.
2.3.8 Social Elements
2.3.8.1 Affected Environment
Storm Sewer Facilities
Other existing storm sewer facilities in the Oakesdale project area not identified in the DEIS include:
' • Two existing storm drain inlets with 6-inch pipe outlets to the west located on the Boeing Longacres
Office Park property; one located approximately 100 feet, and the second approximately 200 feet,
north of S.W. 27th Street;
• A 6-inch culvert under an existing east-west dirt road located on Longacres Office Park Property
about 1,000 feet north of S.W. 27th Street; and
• Eleven inlets with 6-inch pipe outlets drain an existing paved access road within the Boeing CSTC
property north of S.W. 19th Street. Eight inlets outlet to the CSTC "riverine" wetland on the west
side of the existing road, and three inlets outlet to the CSTC "delta" on the east side of the roadway.
Other Utilitv Features
Additional existing utility features located within the corridor of the refined Alternative A in this FEIS
include:
• An existing irrigation system located within the existing access road and buffer areas adjacent to the
"riverine" and "delta"wetlands on the CSTC property.
• An underground vault located within CSTC property about 700 feet south of S.W. 16th Street that
houses pumps used for aerating the "delta"wetland.
' No comments were received and no additional information regarding the affected environment is needed
for this EIS.
2.3.8.2 Impacts
Neighborhood Characteristics and Regional and Community Growth
jNo comments were received and no additional information is needed for this EIS.
City of Renton 2-26 '
FEIS Oakesdale Avenue S.W.
Public Services ,
No comments were received and no additional information is needed for this EIS.
Utilities '
See Section 2.3.4 in this FEIS for additional information on impacts to existing drainage systems that
convey surface water runoff from the Boeing Longacres Office Park and CSTC properties. '
The refined Alternative A in this FEIS avoids the existing CSTC outlet control structure in the "delta"
wetland that regulates the flow of storm water to Springbrook Creek. Therefore, the impacts to this
facility resulting from Alternative A in the DEIS will not occur with the refined Alternative A.
Potential conflicts and impacts resulting from constructing the refined Alternative A Phase 1 and Phase 2
roadways over the existing King County Metro 72-inch and 108-inch trunk sewers will be similar to '
those identified for Alternative A in Section 3.8, Social Elements, of the DEIS, except as described
below.
In lieu of the bridge structure and roadway fill at the bridge approaches proposed for Alternative A in the
DEIS, Phase 2 construction for the refined Alternative A in this FEIS will include expanding the existing
north-south earth embankment with a retained fill extending into City of Renton wetlands. The retained
fill will be located over the existing King County Metro 72-inch trunk sewer. (Potential impacts to the
72-inch sewer will be similar to those identified for Alternative A in the DEIS.) Similar potential
impacts to the flow and integrity of the 108-inch trunk sewer that could result from constructing a
portion of the new Phase 2 roadway on the existing earth embankment are not anticipated. Consolidation
of soils over the 108-inch sewer would have already occurred, and, further consolidation from vehicular
traffic loads introduced after completion of the Phase 2 roadway should not be significant.
Potential impacts to the refined Alternative A Phase 1 and Phase 2 roadways resulting from the presence
of the 72-inch and 108-inch sewer lines (maintenance, overflows, settlement of existing backfill over
these sewers) will be similar to those identified for Alternative A in the DEIS.
Conflicts with the existing 60-inch Cedar River water pipeline and impacts to the City of Renton water
lines, hydrants, valves, etc. resulting from Phases 1 and 2 of the refined Alternative A in this FEIS will
be similar to those identified in Section 3.8, Social Elements, of the DEIS. Also, impacts to power lines, '
natural gas and fuel oil lines, and telephone facilities resulting from Phases 1 and 2 of the refined
Alternative A will be similar to those identified for Alternative A in the DEIS.
The refined Alternative A in this FEIS will impact the existing irrigation system on Boeing's CSTC
property to the extent that relocation of the section of 8-inch irrigation water line located within the new
roadway right-of-way may be required.
The refined Alternative A in this FEIS will impact the existing underground vault housing aeration
pumps to the extent that relocation of this vault will be necessary.
Numerous new utilities (water, sewer, telephone, gas, etc.) are proposed within the refined Alternative A ,
corridor in connection with Boeing's Commercial Airplane Group Headquarters Building currently under
construction on the west side of the new roadway. Extensive coordination with The Boeing Company
will be needed to resolve potential conflicts between Boeing's proposed utility systems and the refined
Alternative A storm drainage system.
No comments were received and no other additional information related to utility impacts is needed for
this EIS.
Final Environmental Impact Statement 2-27
Additional Information
' Cumulative Impacts
No comments were received and no additional information is needed for this EIS.
2.3.8.3 Mitigation
The refined Alternative A in this FEIS avoids relocation of the existing outlet control structure in the
CSTC delta wetland. Therefore, mitigation identified in the DEIS is not applicable to the refined
Alternative A.
' The refined Alternative A in this FEIS may require relocation of a section of 8-inch irrigation water line
and relocation of a vault housing aerating pumps, both located on Boeing CSTC property. Relocation of
these facilities will be coordinated with The Boeing Company and, if required, will comply with all
applicable standards and regulations.
The refined Alternative A in this FEIS will not construct a bridge in the Phase 2 segment of the
Oakesdale project. Therefore, mitigation in the DEIS related to construction of the Phase 2 bridge is not
applicable to the refined Alternative A.
Extensive coordination with The Boeing Company will be needed to resolve potential conflicts between
Boeing's proposed utility systems for their CAG Headquarters Building currently under construction and
the storm drainage system for the refined Alternative A in this FEIS.
' No comments were received and no additional mitigation measures are required to mitigate impacts
associated with the refined Alternative A in this FEIS.
' 2.3.8.4 Impact Summary
Significant Unavoidable
Significant Impacts Mitigation Measures Adverse Impacts
Refined Alternative A,
Phases 1 and 2
' Phase 1 would require relocation Relocation will be coordinated None identified.
of section of Boeing CSTC with Boeing and will comply
irrigation line and vault housing with all applicable standards and
Iaerating pumps. regulations. ( R )
Phase 1 will require relocation of Relocation will be coordinated None identified.
water lines, hydrants and valves. with Boeing, where applicable,
and the City of Renton Water
Utility, and will comply with all
applicable standards and
regulations. ( R )
Relocation will be in
conformance with requirements
of the City of Renton and Boeing
to assure disruptions to service
1 would be minimized. ( R )
City of Renton 2-28
FEIS Oakesdale Avenue S.W.
Significant Unavoidable '
Significant Impacts Mitigation Measures Adverse Impacts
Refined Alternative A,
Phases 1 and 2
Phase I will require relocation of Puget Sound Energy will relocate None identified.
I 1 5kV power lines. power lines, where necessary, ,
and in conformance with their
requirements to assure
disruptions to service would be ,
minimized. ( R)
Potential settlement and other Design and construction of Phase None identified.
impacts to King County Metro 2 fill and retaining structures will
72-inch line resulting from Phase be coordinated with King County
2 construction. Metro. ( R)
( R) Required Mitigation
2.3.9 Transportation
No comments were received and no additional information is needed for this EIS.
2.3.10 Parks and Recreation '
2.3.10.1 Introduction
No comments were received and no additional information is needed for this EIS. ,
2.3.10.2 Affected Environment ,
The following clarification to text in the DEIS is in response to a comment received from the City of
Renton Community Services: The 0.33 mile segment of the Springbrook Creek trail crossing through the
Boeing CSTC site accommodates only the pedestrian user(by agreement between the City of Renton and
The Boeing Company).
No other additional information is needed for this EIS as a result of refinements to Alternative A in this
FEIS.
2.3.10.3 Impacts
The sidewalks and bicycle lanes proposed for Phase I of each action alternative (Alternatives A and C)
evaluated in the DEIS would provide an alternative north-south pedestrian and commuter bicycle route in
addition to (rather than "in lieu of as noted in the DEIS) the Springbrook Trail which is primarily for
recreational or pedestrian use.
Two additional links to improve pedestrian and bicycle access are proposed as part of Phase I of the
refined Alternative A in this FEIS. The missing 300-foot length of sidewalk would be constructed to the
east along the north side of S.W. 27th Street between the new Oakesdale Avenue S.W. and the western
boundary of the Allpak property. The existing paved access road on Boeing property south of S.W. 27th
Street (in the Phase 2 Oakesdale Avenue S.W. project corridor) would be formalized (e.g. signing,
pavement markings) to provide an interim pedestrian and bicycle connection between Phase I Oakesdale
1 Final Environmental Impact Statement 2-29
Additional Information
' to the north and existing Oakesdale to the south until Phase 2 of the Oakesdale Avenue S.W. project is
constructed. This connection will be subject to the City of Renton obtaining the necessary easement
' rights from The Boeing Company and King County Metro to allow public pedestrian and bicycle use of
the existing road.
Comments were received but do not require additional information for this EIS. Also, no other
' additional information is needed for this EIS as a result of refinements to Alternative A.
2.3.10.4 Mitigation
jNo comments were received and no additional mitigation measures are required to address impacts
associated with refinements to the Alternative A in this FEIS.
' 2.3.10.5 Impact Summary
No comments were received and no additional information is needed for this EIS.
2.3.11 Visual Resources
2.3.11.1 Introduction,Approach, Visual Resources, Viewer Response
No comments were received and no additional information is needed for this EIS.
I2.3.11.2 Affected Environment
No comments were received and no additional information is needed for this EIS.
2.3.11.3 Impacts During Construction
No comments were received and no additional information is needed for this EIS.
t2.3.11.4 Impacts During Operation
Phase 1 of the refined Alternative A would be located closer to the Boeing CSTC building (as much as
1 90 feet closer) than Alternative A in the DEIS, and the bridge over Springbrook Creek would be several
feet higher than the bridge crossing proposed for Alternative A in the DEIS. Therefore, the elevated
section of the Phase 1, refined Alternative A would be more of a dominant feature in views from within
and outside the CSTC building. Also, traffic on the Phase 1, refined Alternative A elevated roadway
over Springbrook Creek would be more visible from within the CSTC building. The Phase 1 refined
Alternative A would have similar impacts on views of Springbrook Creek and the natural areas within
the CSTC wetland as the Phase 1, Alternative A in the DEIS.
The Phase 2 roadway of the refined Alternative A would be ten feet lower than the elevated section of
Phase 2 roadway of Alternative A in the DEIS. Therefore, the refined Alternative A roadway and traffic
using the roadway would be a less dominant feature in views from: 1) the east on S.W. 27th Street and
properties in close proximity, particularly views looking southeast from the Longacres Office Park site;
and the Talbot neighborhood located a mile to the east of the new roadway.
Shy wildlife species may be impacted by illumination for the new roadway, especially in the Phase 2
project area.
No comments were received and no additional information is needed for this EIS.
City of Renton 2-30
FEIS Oakesdale Avenue S.W.
2.3.11.5 Mitigation
No comments were received and no additional mitigation measures are required to address impacts
associated with refinements to Alternative A. '
2.3.11.6 Impact Summary
Significant Unavoidable ,
Significant Impacts Mitigation Measures Adverse Impacts
Phases 1 and 2 of the refined Measures proposed in the DEIS None
Alternative A roadway would are applicable No additional
block some views. Vehicular measures are required.
traffic, signing and lighting
would be visible from areas with '
views of the project site.
tin Use shielded lighting fixtures None identified
Potential for illumination g g ,
impacts on some wildlife species particularly in wetland areas.
2.3.12 Historic and Cultural Resources
No comments were received and no additional information is needed for this EIS. '
2.3.13 Hazardous Materials
No comments were received and no additional information is needed for this EIS. '
t
' Final Environmental Impact Statement 3-1
Comments and Responses
3. Comments and Responses
' This section presents the letters of comment received during the 30-day review period for the Draft EIS
and the responses to those comments.
Five letters of comment were received, two from State agencies, two from city agencies, and one letter
from a group of interested citizens. No comments were received from federal agencies.
Comments in each letter are numbered to the right of each comment, with responses to those comments
presented on the pages following the letter. Responses, when appropriate, include reference to sections
in the Draft EIS, reference to additional information presented in Section 2 of this FEIS, or reference to
responses to similar comments elsewhere in this chapter. All parties who submitted comments are
identifed below.
State Agencies
• Washington Department of Ecology May 2, 1997
• Washington Department of Fish and Wildlife May 6, 1997
City Agencies
• City of Seattle Public Utilities April 21, 1997
' • City of Renton Community Services May 2, 1997
Interested Groups/Citizens
• Ted Mallory (Friends of Black River) May 7, 1997
3-2 City of Renton
FEIS Oakesdale Avenue S.W.
;tars cr
' e s
�1 raas
' STATE OF WASHINGTON
DEPARTi\AENT OF ECOLOGY
P.O. Box 47600 • Olympia, Washington 98504-7 600
(360) 407-6000 • TOO Only (Hearing Impaired) (360) 407-6006
May 2, 1997
' Mr. Robert Maim
City of Renton
200 Mill Ave S
IRenton WA 98055
Dear Mr. Mahn:
Thank you for the opportunity to comment on the draft environmental impact statement
(EIS) for the proposed extension of 0akesdale Avenue Southwest- We have reviewed the
document and have the following comments.
General comments:
The proposed project is in an area of existing flooding and infiltration problems, will
P J � �
' cross a waterbcdy with existing water quality problems, and will affect both namraily-
occurring wetlands and wetlands created for mitigation. It is also in an area expenencuig
a great deal of pressure for development and an accompanying increase in impervious
1 surfaces, stormwater problems, and increased inputs of contaminants.
As a result, the permit review for the proposal will require significant assurance that
existing water quality and wetland conditions will not be worsened due to individual or
cumulative project impacts. The project proponent should be prepared to go beyond
standard design criteria to address these impacts. This proposed project should be fully
coordinated with other proposals in the area (e.g., the East Side Green River Watershed
study, adjacent development proposals, etc.) so that cumulative impacts are anticipated
and addressed.
tWater Quality:
' The proposed project crosses Springbrook Creek and would discharge stormwater runoff
into the creek and into nearby wetlands. Springbrook Creek (WRIA 4WA-09-1015,
Class A waters of the state) is on the current 303(d).list of waterbodies exceeding state
water quality standards. The standards exceeded include fecal coliform, temperature,
dissolved oxygen, sediment bioassay, cadmium, copper, mercury, and zinc.
RECEIVED
MAY - 6 1997
Transoortadon Syatema C)1v. C�
Final Environmental Impact Statement 3-3 ,
Comments and Responses
Mr. Robert Mahn '
May 2, 1997
Page 2 '
As part of the Section 401 review, the proponent must show that the proposed project will '
not result in further exceedances of those standards. The draft EIS (page 3.4-16) states
that the stormwater conveyance system, detention facilities, and water quality treatment
facilities will comply with local, state, and federal regulations. Table 3.4-6 also states, 2 ,
that a significant unavoidable adverse impact of the proposed project would be that a
percentage of nutrients and metals would enter receiving waters. The project proponent
will need to go beyond standard designs and operations for stormwater treatment to '
ensure that the water quality standards in Springbrook Creek that are already exceeded are
not further exceeded.
Stormwater discharges to wetlands will need to meet state water quality standards, unless,
through mitigation sequencing, the impacts of such discharges are avoided, minimized. or 3 ,
mitigated through an approved wetland mitigation plan.
Inte—atin2 Water Ouality and Flood-reiaced Design Features — the proposed project and
its increase in impervious surface close to Springbrook Creek will likely result in higher
peak storm discharges, reduced concentration times. the need for increased flood
conveyance, increased erosion, downstream channel instability, and higher contaminant ,
loads in a waterbody that already exceeds several state water quality standards. 4
The project proponent should integrate the flood-related design elements required for '
consistency with Rencon's floodulain management ordinance (e.g., zero rise in floodway,
compensatory storage for till, etc.) with design elements that will prevent further
exceedances of water quality. ,
Wetlands:
Impacts to wetlands due to the proposed project include direct fill, indirect effects such as '
shading, and hydrologic and water quality-related effects such as changes.id the amount
of water entering and leaving wetlands and increases of in-water contaminants. All
wetland-related impacts will require mitigation through a mitigation plan to be approved
by the U.S. Corps of Engineers, Washington Department of Ecology, and oche:state and 5
federal resource agencies. '
We suggest that the mitigation plan include a significant element focused on the
Springbrook Creek corridor and the wetlands immediately adjacent to the stream channel. '
Such a plan should be coordinated with other developments and studies in the area to
ensure that maximum benefit is derived from the required mitigation.
' 3-4 City of Renton
FEIS Oakesdale Avenue S.W.
Mr. Robert Mahn
May 2, 1997
1 Page 3
1 Tom Luster with our Permit Coordination Team would be happy to assist in resolving
these issues. If you have any questions, please call Mr. Luster at (360) 407-6918.
' Sincerely,
' Rebecca J. /�a�n
Environmental Review Section
RI.
cc: Tom Luster, CP
NWRO SEPA Coordinator
Final Environmental Impact Statement 3-5 '
Comments and Responses
Response to Comments from the Washington Department of Ecology
1. This project has been and will continue to be coordinated with the East Side Green River
Watershed Project and adjacent development proposals to ensure that cumulative impacts on
existing water quality and wetland conditions are anticipated and addressed. Also, the City of
Renton will continue to work with all appropriate federal, State and local agencies to provide
assurance that existing water quality and wetland conditions are maintained, and where feasible,
are improved. '
2. Stormwater conveyance, detention and water quality treatment facilities will be designed to meet
current requirements/standards. The DEIS was recognizing that water quality treatment facilities '
are not 100% effective in removing pollutants.
3. Comment noted. See response to Comment 2, above.
4. As noted in the response to Comment 2, above, the project will include stormwater detention and
water quality treatment features to ensure that the issues noted in this comment are mitigated.
Integration of these facilities with floodplain impact mitigation will be considered during the
project design process.
5. Comments noted. The project will include a wetland mitigation plan that will be approved by all
appropriate federal, State and local agencies. Coordination with other developments and studies
in the area is anticipated during development of this wetland mitigation plan.
' 3-6 City of Renton
FEIS Oakesdale Avenue S.W.
f.Are
1w—
O £
N
71
State of Washington MAY 1 3 1597
DEPARTMENT OF FISH AND WiLDUFt
1 Maiiino Address: 600 Caoitol Wav N•Clvmpia.WA 98501-1091 •(360)902-2200.TOO(36�� i(DF REN TON
Main Office Location: Natural Resources Building-1111 Washington Street Sc•Olymplar' WORKS AOMfN.
' May 6 1997
' Mr. Gregg Zimmerman
Planning/Building/ Public Works Department
200 Mill Avenue South
Renton, Washington 98055
Subject: Caksdale Avenue S.W. ,S.W. 16t-h Street to S.W. 31zt Street, Draft
Env-ironme tat Impact Statement.
Dear Mr. Zimmer-nan:
The =ollowinc are my comments regarding this document:
' 1. Surface Water/Quantity and Quality, Pace 3. 4-3, Paragraph 2,
Hydraulic Project Approvals (HPA) will be recu,red for the bridge over
Springbrook Creek , stormwaLer our-ails and for the discharge of
stornwater into Sprincbrook Creek. We will require that stornwater
discharge meets the reouirements of the Depart-nents of Ecology Stormwater
Manual :or 'Puget Sound. in addition WDF-+d recommends wet pones and
bioswales for water quality instead of undercround vaults. D am
concerned that the vaults will not get the proper maintenance.
2 Wetlands- Pace 3 .5-1,
A.'ADFW also has authority for wetlands associated with Springbrook Creek
in addition WDFW wetland policy recuires that if there is a HPA for a 2
' project than WDF-d will recui,e 2:1 mitigation for all wetland impacts
even �-. thev are not associated with Springbrook Creek.
B.?roject Construction Overview, ?ace 3.5-8 Last Paragraph-= would
recommend and support the removal of the erriban.1ment supporting the paved 3
access road be removed between wetland ? and the South Marsh and wetland
F and wetland G. This would provide better access for ar-L-rz_s to utilize
this wetland system without crossing roads or going t2hrougR culverts.
3. Wildlife, Vegetation, and Fisheries
' A_.Pace 3. 6-4 , Paragraph 3 - numerous swallows nested in old barns on the 14
Loncacres Office Park Property.
B.Pace 3. 6-5, Paragraph 7 - The crass fields and wet'-and pastures provide
foraging habitat for raptors. These areas will be lost as development 15
impact increases.
'C. Do1'_v varden do not use Springbrook Creek. 6
Z would like to thank you for the occortunity comment on this document. If
' you have any questions please call me at (206) 391-4365 .
Sipcerely,
' ?hilip -chneider cc Ted Muller- WDFW
Habitat Biologist Rod Malcomb - Mukelshoot Tribe
Jane Banvard- WDFW, Olvmnia
Final Environmental Impact Statement 3-7 ,
Comments and Responses
Response to Comments from the Washington Department of Fish and Wildlife (WDFW) '
1. Comments noted. Page IV in Volume 1 of the DEIS identified HPA as a likely permit required
for this project. The project will comply with requirements established by WDFW, including
meeting stormwater discharge requirements of the Department of Ecology's Stormwater Manual '
for Puget Sound. The project proposes above ground water quality treatment facilities except
where space is limited, necessitating the use of underground vaults. The City of Renton has a
maintenance program and staff dedicated to ensuring the proper function of public stormwater
facilities in Renton.
2. Comment noted. The current City of Renton Wetlands Management Ordinance, based on the ,
Washington Department of Ecology's model ordinance, recognizes that wetland mitigation ratios
should vary depending on the quality of wetland impacted. The City's ordinance provides that
the wetlands affected by Phase 1 of the proposed Oakesdale project (construction north of S.W. '
27th Street) shall be replaced at a ratio of 1.5:1; those wetlands affected by Phase 2 of the
proposed project (construction south of S.W. 27th Street) shall be replaced at a ratio of 3:1. For
the total project, the average replacement ratio will be 2.6:1 which meets the 2:1 mitigation ratio '
requirement specified in the WDFW comment.
3. Comment noted. See Section 2.2 of this FEIS for information on the proposed adjustment in the
roadway location south of S.W. 27th Street from the location proposed in the DEIS. Under this ,
new proposal the existing embankment currently supporting the paved access road will be
incorporated with a new retained fill to support the new Oakesdale roadway. A single wide,
deep, bottomless culvert would be included under the new roadway to provide access for wildlife
between wetland areas on both sides of the new road.
4. Comment noted. Information added in Section 2.3.6 of this FEIS. '
5. Comment noted. Information added in Section 2.3.6 of this FEIS.
6. Comment noted and change made. Information provided in Section 2.3.6 of this FEIS. ,
3-8 City of Renton
FEIS Oakesdale Avenue S.W.
City of Seattle DEVELOPMENT PLANNING
Clry pF gFNTOn'
Norman B. Rice, Mayor �� z �, I�g,
Seattle Public Utilities
' Diana Gale, Director RECEIVED
' April 21, 1997
' Development Service Division
Planning/Building/Public Works Department
' Attn.: Mark R. Pywell, AICP
200 Mill Ave. So.
Renton, Washington 98055
Re: Draft Environmental Impact Statement—City of Renton Oakesdale Avenue SW Extension
Project— City of Renton File No LUA-95-024 ElS SM
Gentlemen:
' In reviewing the above referenced DEIS, and ascertaining how it addresses the Seattle Public Utilities
Cedar River Pipeline#4, Seattle Public Utilities (Water Department) requests that the City of Renton
include within its DEIS, the following information aoplicable to the Cedar River Pipeline#4. This
information was previously submitted to HNTS, Inc., February 13, 1996. Submitted information is required
to appear in Section 1.6 Significant Impacts, Mitigation Measures, and Unavoidable Adverse Impacts,
subsection "Social Elements "and also in Section 3.3 Social Elements, for both "Alternatives A&' C.,
The following standards will be required, subject to change depending on final review.
1. The proposed 12 inch storm sewer line'mus:be ductile iron pipe; one length centered
over the pipeline.
2. Restrained joints are required within and along the entire right-or-w,ay�pressure tested to
watermain standards.
3. The pipeline will need protective slabs, pile supported, where the proposed road crosses
' over Alternate A and/or C. Note: It is absolutely essential that any design of for the
proposed roadway facility, in, about and/or upon the location of Seattle Public Utilities
60" Cedar River Pipeline n4, incorporates maximum protection for the intearity of this
' pipeline facility. It is additionally essential that the pipeline be potholed to determine the
exact depth and its location prior to construction of the proposed road and supporting
facilities
' 4. Show pipeline on the profile drawings for Alternate A and/or C whichever is chosen.
' Dexter Horton Building, 1 Oth floor 710 Second Avenue, Seattle WA 981 CA
Tel: (206) 684.5851, TTY/TDD (206) 233-7241, FAX: (206) 684.4631
ea.ucl employment opportunity affirmative action employer. Accommodations for people with disabilities provided on request.
19
•
Final Environmental Impact Statement 3-9 ,
Comments and Responses
Page 2 of 2
April21, 1997
Seattle Public Utilities
Review DEIS —Cakesdale Ave. SW Extension.
It was also determined in our review, and not defined within the DEIS, that Land Acquisition requirements '
necessary to support this activity/project have not been addressed in relation to Seattle Public Utilities
Cedar River Pipeline m 4, 30 foot wide, fee owned corridor. It is required and essential that the City of
Renton make application for an easement/consent.agreement(s) to build the roadway over Seattle ,
Public Utilities fee owned property. It will be necessary for any easement document conveying any partial 2
interest in City owned real property to be deliberated upon and approved by the Seattle City Council.
As this process may require considerable time for necessary reviews, consideration, document ,
processing, appraisals and approvals, it would be beneficial for the City of Renton to initiate its acquisition
process when reasonably practicable.
In continuation of our analysis and recommendations applicable to the above mentioned DEIS, Seattle ,
Public Utilities requests that the City of Renton include in its Contract Plans all of Seattle Public Utilities
existing pipeline facilities. It is additionally requested and required that when any work or proposed use of
Seattle Public Utilities fee owned right of way is planned or scheduled within or near the City's pipeline 3
facilities, precise Construction Plans must be submitted to Seattle Public Utilities for review and approval
prior to any construction or use activity.As previously alluded to an Easement will be required from Seattle
Public Utilities for any such usage. For your convenience, "As Built Construction Plans" are available from ,
Seattle Public Utilities (Water Department) upon request
Your consideration and cooperation in this matter is very greatly appreciated.
Should you have any further question please feel free tail me at 684-5970 ,
Sincerely ,
William P. Cluckey
Real Estate Services
cc: 0. Garrison '
0.Richardson
' 3-10 City of Renton
FEIS Oakesdale Avenue S.W.
Response to Comments from the City of Seattle Public Utilities
' 1. Comments noted. The City of Renton will work with Seattle Public Utilities regarding the
design details necessary for the protection of the 60-inch water pipeline facility.
' 1 Comments noted. Section 3.7.3.2 in volume 1 of the DEIS (page 3.7-11) identifies the easement
requirement from the Seattle Public Utilities (Water Department) for the proposed roadway
crossing of the 60-inch water pipeline.
1 3. Comments noted.
' Final Environmental Impact Statement 3-11
Comments and Responses
R
CITY OF RENTON
:;7
Community Services
MEMORANDUM
Date: May 2, 1997
To: Bob Mahn, Civil Engineer III
From: Leslie A. Betlach Parks Dire
ctor
' Re: Draft Environmental Impact Statement
Oakesdale Avenue S.W.
S.W. 16th Street to S.W. 31 st Street
' Thank you for providing me the opportunity to review and comment on the Draft
Environmental Impact Statement for the above-referenced project. We support
Alternative A but would like to comment upon the following areas:
1. In Chapter 1, pages 1-3, Summary, Section 1.4 Alternatives, and on page 1-4,
Section 1.4.1, Alternative A, Phase I is described as a four lane road (two in each
direction) with a center turn lane/median from SW 16th Street to SW 27th Street. The
preliminary landscape plans that have been made available to me for the preparation of
a landscape maintenance program describe Phase I as a three lane road from SW 16th
' to SW 27th Streets, with a sidewalk and bike trail on the outside (right-hand) side and
landscaping on the outside (right-hand) side (one side only at this time).
The phased descriptions of work need to be clarified and/or modified. '
In addition the Phase II description in these sections include a four lane extension with
' a center turn lanelmedian from SW 27th Street to SW 31st Streets. Again the
preliminary landscape plans that have been made available to me for the preparation of
landscape maintenance program describe Phase II as completing the construction of
' the 2 additional lanes from SW 16th to SW 27th Street with a sidewalk and bike trail on 2
the other outside (right-hand) side and landscaping also again on the outside (right-
hand) side. Phase II on these landscape plans additionally includes the construction of
' a four lane road with a center turn lanelmedian from SW 27th Street to SW 31 st Street.
(It should be noted that upon completion of Phase II, there would be a bike lane and
sidewalk on each side of Oakesdale Avenue).
3-12 City of Renton '
FEIS Oakesdale Avenue S.W.
Oakesdale Ave.Extension Project
March 5, 1997
Page 2 of 2
Again, the phased descriptions of work need to be clarified and/or modified.
2. In Chapter 3, page 3.10-6, Parks and Recreation, Section, Impact of Operation, ,
paragraphs 5 and 6, it is suggested that the new bicycle lanes and sidewalks to be
constructed as part of the Oakesdale Ave Improvements will provide "alternative north- ,
south pedestrian and commuter bicycle route (in lieu of the Springbrook Creek Trail)
between SW 16th Street and SW 27th Street" and under Phase 11 between SW 27th
Street to SW 31 st Street.
Please note, this should be "in addition to" the Springbrook Creek Trail along the 3
Springbrook Creek Channel. These two systems serve different functions and user
groups and although they should be connected to one another, they can function
independently. The Springbrook Creek Trail is primarily for the recreational user
(pedestrian oriented), while the proposed bicycle lanes along Oakesdale serve the
commuter bicyclist population. It should also be noted that the Springbrook Creek Trail
through the Boeing CSTC facility only accommodates the pedestrian user (by
agreement between the City of Renton and the Boeing Company). ,
If you have any questions, please call me at x-5549. I look forward to working with you
cc: Jay Covington, Executive Assistant
Sam Chastain, Community Services Administrator '
Al Dieckman, Parks Maintenance Manager
Gregg Zimmerman, Planing/Building/Public Works Administrator
Sandra Meyer, Transportation Director
o&usoA2Doc-vs":,"Am2 .-
1 Final Environmental Impact Statement 3-13
Comments and Responses
1 Response to Comments from the City of Renton Community Services
1. Comment and request noted. Information on phasing of the project provided in Section 2.2 of
this FEIS.
' 2. See response to Comment 1, above.
3. Comment noted and change made. Information provided in Section 2.3.10 of this FEIS.
i
1
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1
1
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1
1
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3-14 City of Renton
FEIS Oakesdale Avenue S.W.
o7"- �El���
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Final Environmental Impact Statement 3-15
Comments and Responses
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3-16 City of Renton
FEIS Oakesdale Avenue S.W.
Response to Comments from Ted Mallory for Friends of Black River
1. Comment noted.
2. Comment noted. All mitigation identified in the DEIS will be considered for inclusion in the
City's Mitigation Document which will set forth the mitigation measures for the project.
3. Comment noted. Section 3.10.4 in Volume I of the DEIS (page 3.10-7) identifies relocation of
the Springbrook Creek Trail as a measure to mitigate the proposed project's impacts on the Trail.
This measure will be considered for inclusion in the City's Mitigation Document.
4. The lowering of the water surface by as much as one foot noted in the DEIS was estimated to
occur for a 2-year storm event. Normal hydrology (depth and duration of inundation) of the
south wetlands should not be impacted by removal of the existing earth embankment. However,
' as described in Chapter I of this FEIS, the current project proposal is to retain the existing
embankment and incorporate it with a new retained fill to provide support for the new Oakesdale
roadway. A single wide, deep, bottomless culvert would be included to provide access for
wildlife between the south wetlands. This culvert will be designed to maintain the existing outlet
elevation and minimize impacts to the normal water level in the south wetlands.
5. Comment noted. Pile driving is no longer proposed as a method of construction for the project.
' Sections 3.6.4 and 3.6.5 of Volume 1 of the DEIS (pages 3.6-11 and 3.6-12) identified timing of
construction activities as a measure to mitigate impacts during the wildlife nesting and rearing
season. This measure will be considered for inclusion in the City's Mitigation Document.
6. Comment noted. Information provided in Section 2.3.11 of this FEIS regarding the use of
shielded lighting fixtures as a measure to minimize illumination impacts on shy wildlife species
in the wetland areas of Phase 2 as well as Phase 1. This measure will be considered for inclusion
in the City's Mitigation Document.
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