HomeMy WebLinkAboutPermit 90-04-DR - CITY OF TUKWILA - WIDENING HWY 181 - 180TH STREET DESIGN REVIEW90-4-dr
state route 181 south 180th street
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Permit 90-04-DR - CITY OF TUKWILA - WIDENING HWY 181 - 180TH STREET DESIGN REVIEW
City of Tukwila
6200 Southcenter Boulevard
Tukwila Washington 98188
(206) 433 -1800
Gary L. VanDusen, Mayor
FILE NUMBER: 90 -4 -DR DESIGN REVIEW
NOTICE OF DECISION
APPLICANT: Tukwila Public Works Department
MAR 8 1990
ruKw
PUfLIc
REQUEST: Improve and widen roadway and bridge at the
intersection of West Valley Highway (SR 181) and
South 180th Street.
LOCATION: Intersection of SR 181 and South 180th
The Board of Architectural Review (BAR) conducted a review of the
request on (date of review) March 22, 1990 and,
(action) approved the request under the condition that a
landscape plan be submitted prior to finalized construction plans
for proposed project for approval by Planning Division.
The BAR adopted the Findings and
Conclusions contained in the staff report
dated March 12. 1990
Any party aggrieved by this decision may appeal in writing with
the City Clerk within ten (10) days of the above date and shall
state the reasons for the appeal.
2d.bar
NAME: Rebecca Fox
TITLE: Associate Planner
DATE: March 26, 1990
HEARING DATE:
FILE NUMBER:
APPLICANT:
REQUEST:
LOCATION:
ACREAGE:
COMPREHENSIVE
PLAN DESIGNATION:
ZONING DISTRICT:
SEPA
DETERMINATION:
ATTACHMENTS:
City of Tukwila
6200 Southcenter Boulevard
Tukwila Washington 98188
(206) 433 -1800
Gary L. VanDusen, Mayor
STAFF REPORT
TO THE
BOARD OF ARCHITECTURAL REVIEW
Prepared March 12,1990
March 22, 1990
90 -4-DR
City of Tukwila Public Works Department
Improve and widen roadway and bridge at intersection of West
Valley Highway (SR 181) and South 180th Street.
Intersection of West Valley Highway (SR 181) and South 180th
Street.
N/A
Light Industrial
M -1 (Light Industrial) and C -M (Office Park)
A Determination of Non - Significance was issued on February 28,
1990.
A. Vicinity Map with Project Boundaries
B. Street Improvement Layout and Landscaping
(Shoreline impact zones)
C. Street Improvement Layout and Landscaping
(River cross sections)
STAFF REPORT
to the B.A.R.
BACKGROUND
VICINITY /SITE INFORMATION
I-DR: SR 181/S. 180th Street
Page 2
FINDINGS
1
1. Project Description: The Tukwila Public Works Department proposes to widen West
Valley Highway (SR181) and South 180th Street from five to six lanes at the
bridge,intersection and vicinity.
2. Existing Land Use: Roadway, sidewalk, bridge, and river.
3. Surrounding Land Use: Office /warehouse /commercial and trail.
4. Terrain: Flat except for the area between the bank and the pavement, and the
sidewalk and roadway along West Valley Highway.
5. Vegetation: Grass, shrubs, ivy, isolated evergreens. The most significant landscaping
is a stand of seven mature cherry trees located at the Riverbend Office Park on the
south side of S. 180th, just west of the bridge over the river.
6. Public Facilities: The Christensen Trail runs underneath South 180th Street at the
west approach to the bridge crossing.
This intersection has been recognized as a severely congested area in need of improvement
for many years. Vehicles traveling along South 180th Street and at the SR 181 /South 180th
Street intersection during peak periods experience significant delays. During noon and
evening peak periods, the signal cycle lengths at the SR 181 /S. 180th Street intersection
become very long. This causes poor vehicle progression through the corridor and
excessive vehicle queues form. The queue lengths extend far enough on all approaches to
cause vehicle delays throughout the South 180th Street corridor and on north and
southbound SR 181 in the intersection vicinity.
This project is not subject to the Sensitive Areas Ordinance (SAO) development
moratorium. This project is in the shoreline and is exempt from the Sensitive Areas
moratorium. The project will require a Substantial Development Shoreline Permit.
Specific improvements will include:
1. Widening the existing intersection of South 180th Street and SR 181 to provide
additional left -turn capacity on SR 181 and additional through and right -turn capacity
on South 180th Street; and
2. Widening of the existing bridge on South 180th Street over the Green River.
STAFF REPORT ( (. 4-DR: SR 181/S. 180th Street
to the B.A.R. Page 3
DECISION CRITERIA
This project is subject to Board review due to its location in the Shoreline environment.
Board review criteria are shown below in bold, along with a staff discussion of relevant
facts.
18.60.050: General Review Criteria.
(1) Relationship of Structure to Site.
a. The site should be planned to accomplish a desirable transition with streetscape and to provide for
adequate landscaping and pedestrian movements
b. Puking and service areas should be located, designed and screened to moderate the visual impact
of large paved areas.
c. The height and scale of each building should be considered in relation to the site.
This criterion is not applicable since no structures are included in the proposed
project.
(2) Relationship of Structure and Site to Adjoining Area.
a. Harmony on texture, lines and masses is encouraged.
b. Appropriate landscape transition to adjoining properties should be provided.
c. Public buildings and structures should be consistent with the established neighborhood character.
d. Compatibility of vehicular pedestrian circulation patterns and loading fadlities in terms of
safety, effidency and convenience should be encouraged.
e. Compatibility of on -site vehicular dreulation with street circulation should be encouraged.
The project will widen the roadway and bridge from five to six lanes. It is designed to
accommodate the Christensen Trail which crosses South 180th Street under the
bridge. Trail access will continue during construction. Upon completion, the under -
bridge clearance will remain 7'8" to ensure safe bicycle passage.
(3) Landscaping and Site Treatment
a. Where existing topographic patterns contribute to beauty and utility of a development, they
should be recognized, preserved and enhanced.
b. Grades of walks, parking spaces, terraces and other paved areas should promote safety and provide
an inviting and stable appearance.
c. Landscape treatment should enhance architectural features, strengthen vistas and important axis,
and provide shade.
d. In locations where plants will be susceptible to injury by pedestrian or motor traffic, mitigating
steps should be taken.
e. Where building sites limit planting, the placement of trees or shrubs in paved areas is encouraged.
f. Screening of service yards, and other places which tend to be unsightly, should be accomplished by
use of walls, fendng, planting or combination.
g. In areas where general planting will not prosper, other materials such as fences, walls and pavings
of wood, brick, stone or gravel may be used.
h. Exterior lighting, when used, should enhance the building design and the adjoining landscape.
Lighting standards and fixtures should be of a design and size compatible with the building and
adjacent area. Lighting should be shielded, and restrained in design. Excessive brightness and
brilliant colors should be avoided.
STAFF REPORT ) -4-DR: SR 181/S. 180th Street
to the B.A.R. �."
Page 4
Road widening will not extend westward past the Riverbend Office Park on South
180th. Seven existing cherry trees will be preserved at that location. When sidewalks
are installed there, a wall will be built between the existing street and the trees.
An existing maple tree, located on West Valley Highway southeast of the intersection,
will be saved. Project plans take into account future road improvements by Kent.
Right -of -way or easement will be required to accomplish portions of the project. In
these areas, a comparable level of landscaping will be maintained, with plantings
replaced in kind or relocated as feasible.
Wheelchair ramps will be provided to improve connections to the sidewalk system
along the bridge. Bridge sidewalks will be eight feet wide.
(4) Building Design
a. Architectural style is not restricted, evaluation of a project should be based on quality of its design
and relationship to its surroundings.
b. Buildings should be to appropriate scale and in harmony with permanent neighboring
developments.
c. Building components- such as windows, doors, eaves, and parapets should have good proportions
and relationship to one another. Building components and ancillary parts shall be consistent with
anticipated life of the structure.
d. Colors should be hannonlous, with bright or brilliant colors used only for accent.
e. Mechanical equipment or other utility hardware on roof, ground or buildings should be screened
from view.
f. Exterior lighting should be part of the architectural concept. Fixtures, standards, and all exposed
accessories should be harmonious with building design.
g. Monotony of design in single or multiple buildings projects should be avoided. Variety of detail,
fornn and siting should be used to provide visual interest.
This criterion is not applicable since no buildings are being included in this project.
(5) Miscellaneous Structures and Street Furniture
Neither miscellaneous structures nor street furniture is part of this project.
1
CONCLUSIONS
1
1. No structures or street furniture are included in the project.
2. This project will make vehicular and pedestrian circulation more efficient and safer
with additional lanes, wider sidewalks, and improved wheelchair access.
3. Trail access will be maintained during and after construction. The current 7'8"
clearance under the bridge will be maintained to accommodate bike riders on the
Christensen Trail.
STAFF REPORT
to the B.A.R.
c
)-4-DR: SR 181/S. 180th Street
Page 5
4. Mature maple and cherry trees will be preserved.
5. Landscape changes may occur between the BAR review and development of the final
design plans. The intention is to minimize disruption of landscaping and to replace
in kind whenever possible.
6. Bridge sidewalks will be widened to eight feet on each side and wheelchair ramps will
be provided to allow safe access to bridge.
7. Sidewalks north of the intersection on West Valley Highway will be brought up to
grade and separated from the roadway by a guard rail.
RECOMMENDATIONS
1
The Planning Division recommends approval of the SR 181 /South 180th. Street road and
bridge widening project, with one condition:
1. Detailed landscape plan to be submitted prior to finalized construction plans for
proposed project for approval by Planning Division.
115
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DESPtaN REVIEW APPLICATION
1. BRIEFLY DESCRIBE YOUR PROPOSAL: Widen West Valley Highway (SR 181) and South
180th to 6 -lanes at the intersection
2. PROJECT LOCATION: (Give street address or, if vacant, indicate lot(s),
block, and subdivision; or tax lot number, access
street, and nearest intersection)
West Valley Highway (SR 181) and South 180th Street
Quarter: NW
(This information may be found on your tax statement.)
3. APPLICANT :* Name: City of Tukwila - Department cif Public Works
Signature:
4. PROPERTY Name:
OWNER
Section: 35 Township: 23 Range: 4 E
Address: 6300 Southcenter Blvd., Tukwila, Wa. 98188
Phone: (206) 433 -0179
Date: 5./ 7D
* The applicant is the person whom the staff will contact regarding
the application, and to whom all notices and reports shall be sent,
unless otherwise stipulated by applicant.
Address:
Phone:
AFFIDAVIT OF OWNERSHIP
I /WE,[signature(s)]
swear that I /we are the owner(s) or contract purchaser(s) of thp
property involved in this application and that the foregoing
statements and answers contained in this application are true and
correct to the best of my /our
knowledge and belief. Date:
DESIGN REVIEW APPLICATION
Page 2
The following criteria will be used by the BAR in its decision - making on your
proposed project. Please carefully review the criteria, respond to each cri-
terion (if appropriate), and describe how your plans and elevations meet the
criteria. If the space provided for response is insufficient, use extra space
on last page or use blank paper to complete response and attach to this form.
5. RELATIONSHIP OF STRUCTURE TO SITE
A. The site should be planned to accomplish a desirable transition with
the streetscape and to provide for adequate landscaping, and pedestrian
movement.
B. Parking and service areas should be located, designed, and screened to
moderate the visual impact of large paved areas.
C. The height and scale of each building should be considered in relation
to it site.
RESPONSE: Existing landscaping effected by the improvements will be replaced
in -kind or with native plants. The City's intent is to protect the existing
cherry trees along the South side of South 180th just east of Sperry.
6. RELATIONSHIP OF STRUCTURE AND SITE TO ADJOINING AREA
A. Harmony in texture, lines, and masses is encouraged.
B. Appropriate landscape transition to adjoining properties should be
provided.
C. Public buildings and structures should be consistent with the estab-
lished neighborhood character.
D. Compatibility of vehicular pedestrian circulation patterns and loading
facilities in terms of safety, efficiency and convenience should be
encouraged.
E. Compatibility of on -site vehicular circulation with street circulation
should be encouraged.
RESPONSE: Vehicular will be more efficient and safer with the additional
traffic lanes. Pedistrian safety and circulation will be improved by widening
the existing bridge to include 8 foot sidewalks on each side and by providing
wheelchair ramps and better connections to the sidewalk system.
7. LANDSCAPE AND SITE TREATMENT
C --DESIGN REVIEW APPLICATION
Page 3
A. Where existing topographic patterns contribute to beauty and utility of
a development, they should be recognized and preserved and enhanced.
B. Grades of walks, parking spaces, terraces, and other paved areas should
promote safety and provide an inviting and stable appearance.
C. Landscape treatment should enhance architectural features, strengthen
vistas and important axis, and provide shade.
D. In locations where plants will be susceptible to injury by pedestrian
or motor traffic, mitigating steps should be taken.
E. Where building sites limit planting, the placement of trees or shrubs
in paved areas is encouraged.
F. Screening of service yards, and other places which tend to be un-
sightly, should be accomplished by use of walls, fencing, planting or
combinations of these. Screening should be effective in winter and
summer.
G. In areas where general planting will not prosper, other materials such
as fences, walls, and pavings of wood, brick, stone, or gravel may be
used.
H. Exterior lighting, when used, should enhance the building design and
the adjoining landscape. Lighting standards and fixtures should be of
a design and size compatible with the building and adjacent area.
Lighting should be shielded, and restrained in design. Excessive
brightness and brilliant colors should be avoided.
RESPONSE: All sidewalks will be designed to meet safety and handicap access
requirements.
8. BUILDING DESIGN
( ESIGN REVIEW APPLICATION
Page 4
A. Architectural style is not restricted, evaluation of a project should
be based on quality of its design and relationship to surroundings.
B. Buildings should be to appropriate scale and be in harmony with per -
ma ent neighboring developments.
C. Building components - such as windows, doors, eaves, and parapets -
should have good proportions and relationship to one another. Building
components and ancillary parts shall be consistent with anticipated
life of the structure.
D. Colors should be harmonious, with bright or brilliant colors used only
for accent.
E. Mechanical equipment or other utility hardware on roof, ground or
buildings should be screened from view.
F. Exterior lighting should be part of the architectural. concept. Fix-
tures, standards and all exposed accessories should be harmonious with
building design.
G. Monotony of design in single or multiple buildings projects should be
avoided. Variety of detail, form, and siting should be used to provide
visual interest.
RESPONSE: N/A
9. MISCELLANEOUS STRUCTURES AND STREET FURNITURE
` REVIEW APPLICATION
Page 5
A. Miscellaneous structures and street furniture should be designed to be
part of the architectural concept of design and landscape. Materials
should be compatible with buildings, scale should be appropriate,
colors should be in harmony with buildings and surroundings, and pro-
portions should be to scale.
B. Lighting in connection with miscellaneous structures and street furni-
ture should meet the guidelines applicable to site, landscape and
buildings.
RESPONSE: The existin . .• -- will be widened to the South to provide an additional travel lane. The existing
sidewalks on the bridge will be widened to 8 feet. Like (construction materials
b 'd
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will be utilized for the bridge structure, sidewalks and bridge railways.
INTERURBAN SPECIAL REVIEW DISTRICT N/A
The following six criteria are used in the special review of the Interurban area
in order to manage the development of this area, to upgrade its general appear-
ance, to provide incentives for compatible uses, to recognize and to capitalize
on the benefits to the area of the amenities including the Green River and
nearby recreational facilities, to encourage development of more people- oriented
use, and to provide for development incentives that will help to spur growth.
Please describe how your proposed development relates to the goals for this
District. Use additional response space, if necessary.
10. The proposed development design should be sensitive to the natural amenities
of the area.
N/A
11. The proposed development use should demonstrate due regard for the use and
enjoyment of public recreational areas and facilities.
N/A
N/A
N/A
N/A
(29 /DSGN.APP1 -3)
~iESIGN REVIEW APPLICATION
Page 6
12. The proposed development should provide for safe and convenient on -site
pedestrian circulation.
N/A
13. The proposed property use should be compatible with neighboring uses and
complementary to the district in which it is located.
14. The proposed development should seek to minimize significant adverse
environmental impacts.
15. The proposed development should demonstrate due regard for significant
historical features in the area.
SHOREtINE SUBSTANTIALGGEVELOPMENT
CONDITIONAL USE OR VARIANCE
PERMIT APPLICATION
FOR STAFF" USE ONLY
Planner: File. Number 1n9
Cross - Reference Files:40 "92' Receipt. No.:
TYPE OF ACTION:
Substantial Development Permit Q Conditional Use Q Variance
1. NAME OF APPLICANT: CITY OF TUKWILA - Department of Public Works
Address: 6200 Southcenter Boulevard
City: Tukwila State: WA Zip: 98188
Telephone: (206) 433 - 0179
2. RELATION OF APPLICANT TO PROPERTY: Q Owner Q Purchaser
Lessee Q Other
3. PROPOSED DEVELOPMENT (be specific): Widen SR -181 1.000 feet North & South of
South 180th Street from existing 5 lanes to 6 lanes to provide additional
left turn lanes at South 180th Street. Widen S. 180th St. 500 feet east and
west of SR -181 from existing 5 lanes to 6 lanes to provide right turn lanes at
SR -181. This includes widening the S. 180th St. bridge to 6 lanes from 5 lanes.
4. CURRENT USE OF THE PROPERTY WITH EXISTING IMPROVEMENTS: Public Roadway
(see page 1 of Supplemental Information)
5. TOTAL CONSTRUCTION COST AND FAIR MARKET VALUE OF PROPOSED
PROJECT (INCLUDE ADDITIONAL FUTURE DEVELOPMENTS
CONTEMPLATED BUT NOT INCLUDED IN THIS APPLICATION): S 1.110.000
6. GENERAL LOCATION OF PROPOSED PROJECT: Vicinity of South 180th St. and SR - 181
(W. Valley Highway); 1,000 feet north and south of S. 180th St. along SR -181,
and 500 feet east and west of SR -181 along S. 180th Street , within
N.E. QUARTER of SEC 35 of Township 23 N., Range 4 W.M.,
in Tukwila, King County, Washington, adjacent to the Green River.
(see page 6, figure 1 of Supplemental Information)
CITY OF TUKWILA
DEPARTMENT OF COMMUNITY DEVELOPMENT PERMIT NO.:
TO IX Building Planning Pub Wks ;Fire El Police � ! J Parks /Rec
PROJECT 4_ 5. /
ADDRESS5: 4
DATE TRANSMITTED ' /1 � RESPONSE REQUESTED BY //
STAFF COORDINATOR D 'rE/,' /a:45 w DATE RESPONSE RECEIVED
Please review the attached projects plans and respond with appropriate cornments in the space below.
Indicate crucial concerns by checking the box next to the line(s) on which'that concern is noted.
J
L� DRC review requested
LAND USE PERMIT
ROUT MG FORK!
r_1 Plan submittal requested Plan approved
Plan check date: Comments pfrepared by:
09:C6 e
7. LIST THE MASTER PROGRAM POLICIES (USE PROGRAM SECTIONS OR
PAGE NUMBERS) WHICH ARE APPLICABLE TO THIS DEVELOPMENT:
Overall goals; P4.1: 2.4.5,6,7,8,; E:c. _1L —a.._ ?.....
Goals 1, Policies 1,4,5,7,8; Public Access E1enen,:, P4.3: Goal, 1,2,3,4,5,
Policy ib. 2; Circulation Element, P4.4: Goals 1,2. Policies 1,3,;
Recreation Element, P4.5: Goals 1.2, Policies 3, 4a, 4b; Shoreline Use
Element P4.6: Goals 1.2. Policies la. lb, lc, 2,3,4; Conservation Element,
P4.7: Goals 1,2.3. Policies 2.3.4.7,8.9; Environments, P5.1.
8. LIST ANY OTHER PERMITS FOR THIS PROJECT FROM STATE, FEDERAL OR LOCAL GOVERN-
MENTAL AGENCIES FOR WHICH YOU HAVE APPLIED OR WILL APPLY, INCLUDING THE
NAME OF THE ISSUING AGENCY, WHETHER THE PERMIT HAS BEEN APPLIED FOR (AND
IF SO, THE DATE OF THE APPLICATION), WHETHER THEN APPLICATION WAS APPROVED
OR DENIED AND THE DATE OF SAME, AND THE NUMBER OF THE APPLICATION OR PERMIT:
A hydraulic permit from the Department of Fisheries and Department of Game
will be submitted. It is not kr•:cra: if there is an existing lease agreement
regarding the S. 180th Street Briu2,e ,ve:: G ee :, _ve_. '.:e uNa will find out
at the time of this writing. No permits needed for the following: Section 10
and 404 of the Army Corps of Engineers, and Coast Guard Section 9.
(see page 4 and 5 of Supplemental Information)
Type of Beach: Dike
Material: Sandy gravel with vegetation cover.
(11ELINE PERMIT APPLICATION
Page 2
9. NATURE OF THE EXISTING SHORELINE. DESCRIBE TYPE OF SHORELINE, SUCH AS
STREAM, LAKE, MARSH, FLOOD PLAIN, FLOODWAY, DELTA; TYPE OF BEACH, SUCH AS
EROSION, HIGH BANK, LOW BANK, OR DIKE; MATERIAL SUCH AS SAND, GRAVEL, MUD,
CLAY, ROCK, RIPRAP; AND EXTENT AND TYPE OF BULKHEAOING, IF ANY:
(To be completed by local official)
Type of Shoreline: River
•
(To be completed by local official) Not Applicable
(To be completed by local official) Not Applicable
DATE: /
(29 /SHOR.APP1,2)
SIGNATURE:
( _ SHORELINE PERMIT APPLICATION
Page 3
10. IN THE cvENT THAT ANY OF fHE PROPOSED BUILDINGS OR STRUCTURES WILL
EXCEED A HEIGHT OF THIRTY -FIVE FEET ABOVE THE AVERAGE GRADE LEVEL,
INDICATE THE APPROXIMATE LOCATION OF AND NUMBER OF RESIDENTIAL
UNITS EXISTING AND POTENTIAL, THAT WILL HAVE AN OBSTRUCTED VIEW:
11. IF TH.. APPLICATION INVOLVES A CONDITIONAL USE OR VARIANCE, SET FORTH
IN FULL THAT PORTION OF THE MASTER PROGRAM WHICH PROVIDES THAT THE
PROPOSED USE MAY BE A CONDITIONAL USE, OR, IN THE CASE OF A VARIANCE,
FROM WHICH THE VARIANCE IS BEING SOUGHT:
12. GIVE A BRIEF NARRATIVE DESCRIPTION OF THE GENERAL NATURE OF THE
IMPROVEMENTS AND LAND USE WITHIN ONE THOUSAND (1,000) FEET IN ALL
DIRECTIONS FROM THE DEVELOPMENT SITE:
Widen public roadway. Green River will not be disturbed. Existing land
use is Light Industrial and Commercial at this time. The existing landscape
is ex•ected to regain the same. This .ro'ect will not initiate nor encourage
changes to the existing land use. (see page 3 -5 of Supplemental Information)
I HEREBY CERTIFY that I am the above- mentioned.applicant for a
permit to construct a substantial development pursuant to the
Shoreline Management Act of 1971, and that to the best of my
knowledge the information submitted is true and correct.
ROADWAYS
.1_ •,t1 W •."
State Route 1$1 (W sit V Hi hway)
Classification: Principal Arterial - Special Multi -Lane
The existing facility provides a four -lane roadway section with left turn channelization at
selected intersection', two -way left .turn lanes are present along selected section of the
immediate area traversed bj+ the route is dominated by commercial and industrial
development in the City of Tukwila and Kent. The remainder of the route, within the
project limits, is undeveloped lands which fall in the path of future commercial expansion.
Smith 1Aflth Str'' &t Minnr
Classification: Arterial
South 180th Street is an urban arterial which serves as a major east /west arterial from Sr
515 to the Sea -Tae vicinity. South 180th Street provides one of the two crossings of the
Green River south of Interstate 405 and north of South 212th Street.
CHANNELIZATION
SR 181 (West Valley Highway)
The existing facility presents four 10 foot through lanes with three foot shoulders. Twelve
foot left turn lanes are provided at the South 1.80th Street intersection as shown in Figures
2 and 3. The left turn lanes continues north, on Sr 181, as a two -way left . turn - lane.
Shoulder treatment includes guard rail along the side adjacent to the Green River. A curb,
gutter and sidewalk section is present on the cast side of the north leg of the intersection.
Metal bin retaining walls exist adjacent to the Green River to avoid impacting the river
channel in several locations.
Soutt 180tl Strom
The present facility is a five -lane urban arterial with left turn channelization and two -way
left turn lanes extending east and west of its intersection with SR 181. Edge treatment
consists of cement concrete curbs,: gutters and sidewalks. Existing pavement widths are 60
feet on the west leg as shown in Figures 4 and 6, and 56 feet on the east leg.
PEDESTRIAN /BICYCLE CIRCULATION
Existing pedestrian /bicycle facilities in the vicinity of the Sr 181 /South 180th Street
intersection, include concrete sidewalks on both sides of South 180th Street from the west
pavement seat of the South 180th Street bridge easterly.
Existing concrete sidewalk is available on the east side of SR 181 north of the intersection.
South leg of SR 181 has no existing sidewalk.
IMPROVEMENT JUSTIFICATION
This intersection has been recognized as a severely congested area in need of improvement
for many years. Vehicles travelling along the South 180th street corridor and at the SR
181 /South 180th Street intersection during peak periods of a typical weekday, experience
excessive delays. During noon and PM peak period, the signal cycle lengths at the SR
181 /South 180th Street intersection become very long, causing poor vehicle progression
through the corridor and excessive significant vehicle queues to form. These queue lengths
extend far enough on all approaches to cause vehicle delays throughout the South 180th
Street corridor and on north and southbound SR 181 in the intersection vicinity.
In order to identify the type of improvements needed to increase vehicle progression and
reduce vehicle delays during the noon and PM peak periods, a study was prepared by
INCA Engineers, Inc. in April of 1989. The results of the short-term and long -term
improvement alternative analysis are summarized as part of this design report.
1989 LEVEL OF SERVICE
Based on peak hour turning movement counts collected by Trafficount, for the City of
Tukwila, in February 1989 during both the noon and PM peak periods, a level of service
(LOS) analysis was conducted at the intersection of SR 181 /South 180th Street, following
calculation procedures outlined in the 1985 Highway Capacity Manual. Both the noon
(11:30 a.m. -12:30 p.m.) and PM peak (4:15 -5:15 p.m.) hours were examined to determine
existing level of service and potential intersection capacity of various improvement
alternatives.
An operational analysis was conducted at the intersection. Currently, the intersection of
SR 181 /South 180th Street operates at LOS E (57 seconds of delay per vehicle) and LOS F
(64 seconds delay per vehicle) during the 1989 noon and PM peak hours, respectively,
indicating jammed stop and go conditions.
Implementation of the proposed improvements will significantly increase mobility, lessen
accident potential and decreas delays. The proposed improvements would provide an
additional 10 to 15 years of service over existing conditions.
PROPOSED IMPROVEMENTS
The improvements recommended in this design are proposed for , the intersection
improvements of the SR 181 /South 180th Street intersection in Tukwila, Washington, as
shown in Figure 1.
Proposed improvements include:
L Widening the south side of the west approach of South 180th Street to provide an
additional through lane and sidewalk.
L Widening both the north and south approaches of SR 181 to the east to provide dual
northbound to westbound and southbound to eastbound protected left -turn lanes.
Widening the east approach of South 180th Street to provide an exclusive
westbound to northbound right turn lane.
L New traffic signal system and lighting improvements.
L Signing, striping and channelization improvements.
Proposed improvements are described in detail below:
L SR 181 South Leg.
An additional 18 feet of roadway will be added on the east side of the existing five-
lane facility to provide an additional left-turn lane as shown in Figure 2.
SR 181 North Leg
An additional 12.5 feet of roadway, including curb and gutter, will be added on the
east side of the existing five -lane facility to provide an additional left turn lane as
shown in Figure 3.
South 180th Street West Leg
The existing urban street section will be widened an additional 18 feet to provide a
right turn lane at the intersection with SR 181 as shown in Figure 4. The widening
Well include a six foot sidewalk on the south side. The addition of a six foot sidewalk
on the north side is also provided.
L South 180th Street East Leg
Similar to the west leg of South 180th Street, the improvement includes widening
the east leg 12.5 feet on the north side to provide a nght turn lane. In addition to
the street widening a 6 foot sidewalk will be reconstructed adjacent to the curb as
shown in Figure 6.
-3
SIGNALIZATION
In addition to the roadway widening a new traffic signal system will be installed at the SR
181 /South 180th Street intersection. Improvements include new signal poles, mast arms,
vehicle and pedestrian signal heads emergency pre - emption sensors, and luminaires.
This intersection will be interconnected with the existing signalized intersections Sperry
Drive /South 180th Street and 72nd Street /South 180th Street.
STORM DRAINAGE
Storm drainage facilities for widening the SR 181 /South 180th Street intersection will
consist of minor modifications to existing storm sewer systems in place on SR 181 and
South 180th Street. Runoff will be diverted to existing catch basins by adding catch basins
and inlets at selected locations.
Runoff outfall is to enter Green River. To eliminate adverse effects to the water quality of
the river during construction, bails of hay and silt fences will be installed to prevent erosion
along the west side of the river bank. Oil and grease separators are to be installed in
special catch basins to separate oil and grease from water.
EARTH WORK
Approximately 5,000 cubic yards of granule material from State approved sites will be used
to construct roadway embankment. Clearing and grubbing work would generate
approximately 500 cubic yards of extraneous materials which will be removed from the site
and disposed of in accordance with construction requirements of the State and APWA
specifications.
4-
EXISTING CONDITIONS
The Orillia Bridge (South 180th Street Bridge) over Green River is located along South
180th Street intersection on the west approach.
The existingstructure, constructed in 1968, was designed for HS20 Loading and is in good
condition. The present roadway width is 60 feet. The superstructure consists of welded
steel plate girders continuous over spans at 37 feet-115 feet-37 feet supporting a light
weight Concrete deck. Concrete abutments and wall piers are supported by treated timber
piles.
PROPOSED IMPROVEJTS
The South 180th Street Bridge will be widened an additional 20 feet to provide a right turn
lane at the intersection with SR 181. The widening will include 8 foot sidewalks on both
sides of the bridge, and a 12 foot wide right turn lane on the south side of the bridge.
Currently, the bridge provides 2 to 4 foot sidewalks, See Figure 5. Existing concrete
abutments, piers and treated timber piles will be extended to support three additional
welded plate girders with composite concrete decks.
The existing span lengths and vertical clearances will be maintained. The widened portion
will be designed for AASHTO HS20 Liveload matching that of the existing structure. The
bridge deck will be flared at the east abutment to provide a turning radius of 55 feet and an
8 foot sidewalk as both corners.
The proposed widening to the north side of the existing bridge will be limited to widening
the easterly 40 feet of the structure. The abutment will be extended to support a welded
steel plate girder which will attach to the existing exterior at the east pier. The roadway
deck will be flared to provide a turning radius of 55 feet and an 8 foot sidewalk. Again,
existing span lengths and vertical clearances will be maintained.
SEA I. TAC
INTL
AIRPORT
PROJECT
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TUKWILA
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VICINITY MAP
CITY OF TUKWILA
SR 181 I S. 180TH STREET IMPROVEMENTS
T23 N
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S.208th ST.
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FIGURE 1 ,
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Shoulder Line
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IENIffli•TE RAPEPORS
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R/W Line
Proposed R/W Line
A is 5•01'30
R 2000'
• 8776'
L 175.41'
NOTE Old Centerline of SR 181 is Corpovale
Limits of K.nl and ToIndla
N
Curb and Gutter
R/W U
Proposed R/W Line
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CITY OF TUKWILA
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E
STREET IMPROVEMENT LAYOUT
— - _
SR 181 / SOUTH 180TH STREET IMPROVEMENTS
•
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A. BACKGROUND
ENVIRONMENTAL CHECKLIST
2. Name of applicant: Tukwila - Department of Public Works
4. Date checklist prepared: December, 1989
5. Agency requesting Checklist: City of Tukwila
scheduled from May. 1990 to November, 1990.
Con. No.
Epic File No. iP — 9Q
Fee 5100.00 Receipt No.
1. Name of proposed project, if applicable: SR- 181 /South 180th Street
3. Address and phone number of applicant and contact person: 433 - 0179
6. Proposed timing o'r schedule (including phasing, if applicable): Construction
7. Do you have any plans for future' additions, expansion, or further activity
related to or connected with this proposal? If yes, explain. No
8. List any environmental information you know about that has been prepared, or will
be prepared, directly related to this proposal. Washington State Hydraulic
Prnjprt Approval. Shnrpli_ne Management Substantial Development Permit.
9. Do you know whether applications are pending for governmental approvals of other
proposals directly affecting the property covered by your proposal? If yes,
explain. Nu
10. List any government approvals or permits that will be needed for your proposal.
WSDOE - Hydraulic Project Approval
WSDNR - Public Lands CrossingEasement —"
Shoreline Management Substantial Development Permit
SEPA Checklist
City of Tukwila - Design Review
Zsee page 4 -5 of Supplemental Information
-3-
11. Give brief, complete description of your proposal, including the proposed uses
and the size of the project and site. There are several questions later in this
checklist that ask you to describe certain aspects of your proposal. You do not
need to repeat those answers on this page. Section E requires a complete
description of the objectives and alternatives of your proposal and should not be
summarized here.
The_project consists fo widening the existing intersection of South 180th St. and
SR -181 to provide additional left turn capacity on SR Shand additions? rigTt
turn capacity on South 180th St. The mprovement will incluae the wide Ene
. existing bridge, on South 1SOth Street, over the Green River: None o the roadway
widening will be towards the river. (see page 2 -3 and 5 of Supplemental Information)
12. Location of the proposal. Give sufficient information for a person to understand
the precise location of your proposed project, including a street address, if
any, and section, township, and range, if known. If a proposal would occur over
a range of area, provide the range or boundaries of the site(s). Provide a legal
description, site plan, vicinity map, and topographic map, if reasonably
available. While you should submit any plans required by the agency, you are not
required to duplicate maps or detailed plans submitted with any permit applica-
tions related to this checklist.
City of Tukwila - Intersection of sign route on 181 (West Valley Hight01) and
South 180th Street.
Section 36 T.23 N R.4E W.M.
(see pageE figure 1 of Supplemental Information)
13. Does the proposal lie within an area designated on the City's Comprehensive Land
Use Policy Plan Map as environmentally sensitive?
Yes
TO BE COMPLETED BY APPLIr`NT
. B. ENVIRONMENTAL ELEMENTS
Earth
a. General description of the site (circle one):( Flat,)
rolling, hilly, steep slopes, mountainous, other
b. What is the steepest slope on the site (approximate
percent slope)? 0.5
c. What general types of soils are found on the site
(for example, clay, sand, gravel, peat, muck)? If
you know the classification of agricultural soils,
specify them and note any prime farmland.
Silt, sand and gravel
d. Are there surface indications or history of unstable
soli in the immediate vicinity? If so, describe.
No
e. Oescribe the purpose, type, and approximate quanti-
ties of any filling or gradingpropg e Ingicate
source of fill. Street Widening wa require manor
so - : - ,., •0 ii. - ' - will
be imported for the street widening.
f. Could erosion occur as a result of clearing,
construction, or use? If so, generally describe.
Grading for street widening will expose soils
which will be•suscentible to erosion due to
rainfall.
g.
removal of existing smilq arm the imenrtatinn of
' -- mme=cial
- • - . .. 11 - .
About what percent of the site will be covered with
impervious surfaces after project construction (for
example, asphalt or buildings) ? The street widening
will add approximately 25,000 square feet of
impervious surface to the existing street system.
•
( ..
h. Proposed measures to reduce or control erosion, or
other impacts to the earth, if any: snit prnminn will be ..
controlled by the application of t
� temporary measures :;:.::;;::
including but not limited to the following: Silt - fe!ricing, straw and/
aravel berms in drainaae courses, the placing of filter material
on drainage structure inlets and the expeditious application of
restoration measures. see page o upp emen a Report, and Insert- . A0.3.d. )
2. Air
a. What types of emissions to the air would result from
the proposal (i.e., dust, automobile odors,
industrial wood smoke) during construction and when
the project is completed? If any, generally
describe and give approximate quantities if known.
Construction activities may temporarily increase dust and
equipment exhaust levels. Following project completion, air
quality may be affected by the increase in roadway. capacity
at the subject intersection.
b. Are there any off -site sources of emissions or odor
that may affect your proposal? If so, generally
describe. No
c. Proposed measures to reduce or control emissions or
other impacts to air, if any: Grading operations which produce
airborne dust particles wi.u.b con oiled by the application
of water to the graded surfaces durinfraiy construction
periods.
3. Water
a. Surface:
1) Is there any surface water body on or in the
immediate vicinity of the site (including year -
round and seasonal streams, saltwater, lakes,
ponds, wetlands)? If yes, describe type and
provide names. If appropriate, state what
stream or river it flows into. The intorepoti to be improved is
imenpeiiatooy n 4-kw Croon mi to South 1B0th
Stre t i r _ 1,+d Fhe m; dig, of the present bridge over the
Green Ri mmw _
_ Evaluation for
(.
2) Will the project require any work over, r in or - `}
adjacent to (within 200 feet) the
waters? If yes, please describe and attach
- �
a v a i l a b l e plans. The prpi ec_t wi 11 include improvements
SR 181 (West Valley Highway) which lies east ' and adjacent' : `'•''
to the Green River as well as improvements to;;the':existing
bridge on South 180th Street. (see page 3 and • -
5 of Supplemental Report)
3) Estimate the amount of fill and dredge material
that would be placed in or removed from surface
water or wetlands and indicate the area of the
site that would be affected. Indicate the
source of f i l l material. No material will be removed
from or placed in the Green River.
4) Will the proposal require surface water
withdrawals or diversions? Give general
description, purpose, and approximate quan-
tities, if known. The proposal will not require
surface water withdrawals or diversion.
`CPC Insrt B. B.5.d.)
5) Ooes the proposal lie within a 100 -year
floodplain? If so, note location on the site
plan. No
6) Ooes the proposal involve any discharges of
waste materials to surface waters? If so,
describe the type of waste and anticipated
volume of discharge. • materials to
* • _ - . • •. . - . . . • - - Rowever,
accidental sells of p.t!. -nl a.,m prnA1,
or chemicals is possible dung crui t.-, on.
Agency Use Only
b. Ground:
1)
Will ground water be withdrawn, or will water be.
discharged to ground water? Give general
description, purpose, and approximate
tities, if known. No. see Insert A- B.3.d) ....
2) Describe waste materials that will be discharged
into the ground from septic tanks or other sour-
ces, if any (for example: Domestic sewage;
industrial, containing the following
chemicals...; agricultural; etc.) Describe the
general size of the system, the number of such
systems, the number of houses to be served (if
applicable), or the number of animals or humans
the system(s) are expected to serve.
No waste materials will be disc
the groundwater as a result of the roadway
construction.
c. Water Runoff (including storm water):
1) Describe the source of runoff (including storm
water) and method of collection and disposal, if
any (include quantities, if known). Where will
this water flow? Will this water flow into
other waters? If so, describe. Rainfall is the most
probable source of water runott. Roadway runoff
wi •e • re e• o e e ges o pave• surfaces
and collected or directed by curbs to existing or
additional drainage stru ores. a accumulation
of runoff will be directed'' bting drainage
facilities wnicn discnargeinnto the Green River.
(see pale 4 of Suoolemental Report and Insert__A- B.3.d.)
4. Plants
2) Could waste materials enter ground or surface
waters? If so, generally describe. Waste materials
from the roadway, such as fuels and oils, may
enter the zroundwater and /or surface waters. The
proposed roadway improvements are expected to have
minimal immuact on the quantity of these type a
pollutants.
d. Proposed measures to reduce or control surface,
ground, and runoff water impacts, if any:
__See Insert A)
a. Check or circle types of vegetation found on the
site:
X deciduous tree: alder, maple, aspen, other
evergreen tree: fir, cedar, pine, other
X shrubs
X grass
_ pasture
crop or grain
_ wet soil plants: cattail, buttercup, bullrush,
skunk cabbage, other
water plants: water lily, eelgrass, milfoil, other
_ other types of vegetation
b. What kind and amount of vegetation will be removed
or altered? None
Evaluation for
Agency Use Only
c. List threatened or endangered species known to be on
or near the site. None are expected on the basis of
habitat types observed.
5. Animals
a. Circle any birds and animals which have been
observed on or near the site or are known to be on
or near the site:
birds: hawk, heron, eagle,(songbirds,) other:
mammals: deer, bear, elk, beaver, other:
fish: bass,(salmon, trout,) shellfish,
• other:
b. list any threatened or endangered species known to
be on or near the site. Co not know
c. Is the site part of a migration route? If so,
exp 1 ai n . The Green River is a migration route
for salmon and trout. - -�� --
d. Proposed measures to preserve or enhance wildlife,
if any: (See Insert B)
-10-
7. Environmental Health
6.' Energy and Natural Resources
a. What kinds of energy (electric, natural gas, oil,
wood stove, solor) will be used to meet the
completed project's energy needs? Describe whether
it will be used for heating, manufacturing, etc.
Fossil fuels for construction activities and
the transfer of materli
manufacturing of necessary materia s. EIeTr
energy may be required for aaditionar Tigfifi
and traffic signs sT
b. Would your project affect the potential use of solar
energy by adjacent properties? If so, generally
describe. Does not apply
c. What kinds of energy conservation features are
included in the plans of this proposal? List other
proposed measures to reduce or control energy
impacts, if any: Reduce traffic congestion and
delays and fuel. consumption. (See page 2 of
Supplemental Report)
a. Are there any environmental health hazards,
including exposure to toxic chemicals, risk of fire
and explosion, spill, or hazardous waste, that could
occur as a result of this proposal? If so,
describe. _uherent risk of spillage or accidents
drip to tra ff i c _apdSons ruc ion activities
jgoica SPctinn 11.3.a)
1) Describe special emergency services that might
be required. Does not apply
2) Proposed measures to reduce or control environ-
mental health hazards, if any: No mitigating
measures-are anticipated.
Evaluation for :"' •
Agency Use
•
the
ical
ng
•
2) What types and levels of noise would be created
by or associated with the project on a short -
term or a long -term basis (for example: traf-
fic, construction, operation, other)? Indicate
what hours noise would come from the site.
(See Insert C)
3) Proposed measures to reduce or control noise
impacts, if any: (See Insert D)
8. Land and Shoreline Use
a. What is the current use of the site and adjacent
properties? Automobile and truck traffic on the
West Valley uigrway (5x I3I) ana south iouth Street.
The Green R Ver 1A ZIUPig the west side of S . 181.
Adjacent properties are developed for wholesale/
retail and light industrial purposes. {see page 1 of
Supplemental Report —
b. Has the site been used for agriculture? If so,
describe. Does not apply
c. Describe any structures on the site. Concrete bridge
with abutments and subsurface p3. ings.
d. Will any structures be demolished? If so, what ?.
None
g.
e. What is the current zoning classification of the
site? Ml - Light Indus
f. What is the current comprehensive plan designation
of the site? Light Industrial
If applicable, what is the current shoreline mAster
program designation of the site? The Green Paver
in Tukwila is designated ash an urban environment.
h. Has any part of the site been classified as an
The adjacent y Green t River area? s b ee n so.. a ssi x i
as an pnvi re,nmpnta1,1,y_Sensitive areg
i. Approximately how many people would reside or work
in the completed project? Does not apply
j. Approximately how many people would the completed
project displace? pique
k. Proposed measures to avoid or reduce displacement
impacts, if any: Zags not apply
1. Proposed measures to ensure the proposal is com-
patible with existing and projected land uses and
plans, if any: Does not apply
Evaluation for
Agency Use Only
9. Housing
10. Aesthetics
Approximately how many units would be provided.
any? Indicate whether , middle, or'low-incomeW .
a .
housing? None - _ `. '' ` "
b. Approximately how many units, if any, would be eli-
minated? Indicate whether high, middle, or low -
income housing. None
c. Proposed measures to reduce or control housing
impacts, if any: Does not app y
a. What is the tallest height of any proposed
structure(s), not including antennas; what is the
principal exterior building material(s) proposed?
des not amp,
b. What views in the immediate vicinity would be
altered or obstructed? None
c. Proposed measures to reduce or control aesthetic
impacts, if any: Does not apply
-13-
Evaluation for
. Use Only
•
11. Light and Glare
•
a. What type of light or glare will the proposal. -
produce? produce? What time of day would it mainly occur ?'
on the project. (see page 4 of Supplemental
Information).
b. Could light or glare from the finished project be a
safety hazard or interfere with views? No
c. What existing off -site sources of light or glare may
affect your proposal? None_
;
d. Proposed measures to reduce .or control light and
w 1 re impacts, if any: No mitigating measures
ill be necessary
12. Recreation
a. What designed and informal recreational oppor-
tunities are in the immediate vicinity?
cr rtstensdri Trati adiacent to the Green River
and the west Valley Hiahway. (see page 1 of
,SupplPmPnral Tnfnxnation')
b. Would the proposed project displace any existing
recreational uses? If so, describe. No
c. Proposed measures to reduce or control impacts on
recreation, including recreation opportunities to be
provided by the project or .applicant, if any:
Coes not apply
-14-
Evaluation for •
Agency Use Only
13. Historic and Cultural Preservation
a. Are there any places or objects listed on, or pro -.
posed for, national, state, or local preservation
registers known to be on or next to the site? If
so, generally describe. Do not know
b. Generally describe any landmarks or evidence of
historic, archaeological, scientific, or cultural
importance known to be on or next to the site.
Interurban Avenue (West Valley Highway = 'SF: 181)
was the first road to Jinx racbir ana beatzle.
c. Proposed measures to reduce or control impacts, if
any: None
14. Transportation
a. Identify public streets and highways serving the
site, and describe proposed accss to the existing
street system. Show on site plans, if any.'"he site
j a afAVVem ? by South 18eth Street, a city street
pn1 SR iai (West Valley Highway). a state highway.
A04 -oss to existing streets will not be chimed.
asge_page_Lligurs_Lse Supplemental Report)
b. Is the site currently served by public transit? If
not, what is the approximate distance to the nearest
transit stop? Yes
c. How many parking spaces would the completed project
have? How many would the project eliminate?
Does not apply
Evaluation for
•
Agency Use Gnly
d. Will the propos(. require any new roads or strC .
or improvements to existing roads or streets, not
including driveways? If so, generally describe.
(indicate whether public or private).
See 14 — a
e. Will the project use (or occur in the immediate
vicinity of) water, rail, or air transportation? If
so, generally describe. ro
f. How many vehicular trips per day would be generated
by the completed project? If known, indicate when
peak volumes would occur. rasps not apply
g.
Proposed measures to reduce or control transpor-
tation impacts, if any: The project proposes to reduce
• - lized
t•
-tt
• _t.
intersection by increasing left and right turn
capacity. (see e 2 of Supplemental Report, and 6 -C
of this checklist)
15. Public Services
a. Would the project result in an increased need for
public services (for example: fire protection,
police protection, health care, schools, other)? If
so, generally describe. No
b. Proposed measures to reduce or control direct
impacts on public services, if any.
DCES NCT APPLY
-16-
Agency Use Only
16. Utilities {
a. Circle utilities currently
available
electricity, ..natural gas,'
wat r 4'r
� �= . �� = = "'
saw' ' ary . s ewer, . s e t c , sy
Rkprm sewer system, television c ab
PLEASE CONTINUE TO THE NEXT PAGE.
•
•
•
•
le system. `'
= ` ='
b. Describe the utilities that are proposed for the
project, the utility providing the service, and the
general construction activities on the site or in
the immediate vicinity which might be needed.
manor adjustments to existing serving uti s y
equipment and faciliti a may be neGew3asY --
C. Signature
The above answers are true and complete to the best of
my knowledge. I understand that the lead agency is
relying on them to make its decision.
Signature:
Date Submitted: /
. Agency Use Qnl
TO BE GOMPLErEU BY APPLICANT
O. SUPPLEMENTAL SHEET FOR NONPRUJECT ACTIONS
(do not use this sheet for project actions)
Because these questions are very general, it may be helpful ..-
to read them in conjunction with the list of the elements of •
the environment.
When answering these 'questions, be aware of the extent the
proposal, or the types of activities likely to result from
the proposal, would affect the item at a greater intensity
or at a faster rate than if the proposal were not imple-
mented. Respond briefly and in general terms.
1. How would the proposal be likely to increase discharge
to water; emissions to air; production, storage, or
release of toxic or hazardous substances; or production
of noise?
Proposed measures to avoid or reduce such increases are:
2. How would the proposal be likely to affect plants, ani-
mals, fish, or marine life?
Proposed measures to protect or conserve plants, ani-
mals, fish, or marine life are:
Evaluation for
• Agency Use Only
3. How would the pro osal be
natural resources?
Evaluation for
Agency Use Only
l ikely to deplete energy or „
• .
Proposed measures to avoid or reduce shoreline and
use impacts area:
6. How would the proposal be likely to increase demands on
transportation or public services and utilities?
Proposed measures to reduce or respond to such demand(s)
are:
7. Identify, if possible, whether the proposal may conflict
with local, state, or federal laws or requirements for
the protection of the environment.
. Evaluation for
...Agency Use Only
How does the proposal conform to the Tukwila Shoreline
Master Plan?
Proposed measures to avoid or reduce the conflict(s)
are:
-21 -
Evaluation for
Agency Use Only
•
iu MNLc I cJ o f r+rr iLAN i
E. SUPPLEMENTAL SHEET FOR ALL PROJECT AND NON PR
PROPOSALS
The objectives and the alternative means of reaching the
objectives for a proposal will be helpful in reviewing the
aforegoing items of the Environmental Checklist. This
information provides a general overall perspective of the
proposed action in the context of the environmental infor-
mation provided and the submitted plans, documents, suppor-
tive information, studies, etc.
1. What are the objective(s) of the proposal?
To reduce traffic delay, reduce accidents,
increase vehicle capacity, and improve the
overall operation of the SR181 /South 180th
Street intersection. (see pa 2 of Supplemental
Report)
2. What are the alternative means of accomplishing these
objectives? For other short -term improvements, each
leq of the intersection can be improved separately.
Four long -term improvements have been identified:
1) SR 181 separate grade overcrossing 5. itsUth St.
2) S. l8Cth Street over SF lui
3) Realigned full diamond interchange
4) Same as 1) with exception of pronioitea
eastbound to northbound lett turns.
3. Please compare the alternative means and indicate the
preferred course of action: i g _term sn1 nti nns are
c- nrrAntly cnst prnhihitivw (SR to $ ?S Mi114in).
Short -term solutions are mnrrpntly comet faazible
($60 to $514 thousand per inte l '
Evaluation for
Agency Use Only � '``'
Proposed measures to avoid or reduce the conflict(s)
are: Dflp4 not aiao1V
-23-
'
B.3.d
INSERT A
The implementation of sound construction methods will
reduce erosion and therefore potential water quality
degredation. These methods include:
- maintain vegetation cover whenever possible
- use sedimentation control structures
schedule grading and paving to low flow periods
- care in the storage and use of chemicals and petroleum
products during construction.
- stockpile excavated materials away from sensitive areas
- expedite hydroseeding of exposed soils
The purpose of these features is to protect and control the
quality of surface runoff before it enters existing drainage
courses.
If necessary, structural control would consist of sediment
barriers such as silt fencing, gravel berms and hay bales.
Structural controls along with vegetation controls would
provide measures to retain silt before it enters existing
waterways. Frequent inspection and continuous maintenance of
the structural controls are necessary for effective sediment
control.
These proposed erosion control measures should be more than
adequate to reduce or control surface, ground and runoff water
impacts.
B. 5.d
•
Suspended sediment and turbidity is a temporary water .
quality impact that could be harmful to fishery resources.
Curtailment reduction of these temporary construction
impacts would involve measures specified in the Washington
State Departments of Fisheries and Wildlife Hydraulic
projects Approval (IPA). Examples of potential
curtailment measures include restriction of equipment
operation in the river channel, stockpiling of any gravels
for replacement after construction is completed, main-
taining the existing river gradient, and avoiding
disruption of vegetative cover on the river bank. Stock-
piled materials should be covered to prevent erosion and
subsequent sedimentation.
The HPA includes timing provisions that probably would
restrict in- channel work to the low -flow periods during
mid - summer. Further protection against erosion would be
provided by bank protection and stabilization.
B 7.b.2
INSERT C
Construction activities would result in temporary increases in
noise levels in the vicinity of the construction site.
Machinery and trucks used for earthmoving, paving and hauling
materials would be the major noise contributors. Noise levels
typically produced from equipment used during constriction,
range from 75 to 90 decibels at 50 feet. Construction of the
widened roadway and bridge is expected to take approximately
six months. Noise impacts resulting from construction are not
expected to be significant.
Construction activities are allowed between 7:00 A.M. and 10:00
P•M•
INSERT D
B7.b.3
The Tu::wila Noise Ordinance, (Tukwila, 1985) estblishes
stringent noise limits on construction in residential areas
during nighttime hours of 10:00 P.X. to 7:00 A.M. on weekdays
and weekends. These limits effectively preclude constuction
during nighttime hours. Construction noise limits in the
Ordinance would regulate the use of any unusually noisy
equipment.
I M •`
TIN • I
ROADWAYS
• 1:1 W V .
Classification: Principal Arterial - Special Multi -Lane
The existing facility provides a four -lane roadway section with left turn channelization at
selected intersections, two -way left turn lanes are present along selected section of the
immediate area traversed by the route is dominated by commercial and industrial
development in the City of Tukwila and Kent. The remainder of the route, within the
project limits, is undeveloped lands which fall in the path of future commercial expansion.
South 1A(lth Strnnt Minnr
Classification: Arterial
South 180th Street is an urban arterial which serves as a major east /west arterial from Sr
515 to the Sea -Tac vicinity. South 180th Street provides one of the two crossings of the
Green River south of Interstate 405 and north of South 212th Street.
CHANNELIZATION
SR 181 (West Valley Highway)
The existing facility presents four 10 foot through lanes with three foot shoulders. Twelve
foot left turn lanes are provided at the South 180th Street intersection as shown in Figures
2 and 3. The left turn lanes continues north, on Sr 181, as a two-way left turn lane.
Shoulder treatment includes guard rail along the side adjacent to the Green River. A curb,
gutter and sidewalk section is present on the east side of the north leg of the intersection.
Metal bin retaining walls exist adjacent to the Green River to avoid impacting the river
channel in several locations.
South 180th Street
The present facility is a five -lane urban arterial with left turn channelization and two -way
left turn lanes extending east and west of its intersection with SR 181. Edge treatment
consists of cement concrete curbs, gutters and sidewalks. Existing pavement widths are 60
feet on the west leg as shown in Figures 4 and 6, and 56 feet on the east leg.
PEDESTRIAN/BICYCLE CIRCULATION
Existing pedestrian /bicycle facilities in the vicinity of the Sr 181 /South 180th Street
intersection, include concrete sidewalks on both sides of South 180th Street from the west
pavement seat of the South 180th Street bridge easterly.
Existing concrete sidewalk is available on the east side of SR 181 north of the intersection.
South leg of SR 181 has no existing sidewalk,
• 1
IMPROVEMENT JUSTIFICATION
This intersection has been recognized as a severely congested area in need of improvement
for many years. Vehicles travelling along the South 180th street corridor and at the SR
181 /South 180th Street intersection during peak periods of a typical weekday, experience
excessive delays. During noon and PM peak period, the signal cycle lengths at the SR
181 /South 180th Street intersection become very long, causmg poor vehicle progression
through the corridor and excessive significant vehicle queues to form. These queue lengths
extend far enough on all approaches to cause vehicle delays throughout the South 180th
Street corridor and on north and southbound SR 181 in the intersection vicinity.
In order to identify the type of improvements needed to increase vehicle progression and
reduce vehicle delays during the noon and PM peak periods, a study was prepared by
INCA Engineers, Inc. in April of 1989. The results of the short-term and long -term
improvement alternative analysis are summarized as part of this design report.
1989 LEVEL OF SERVICE
Based on peak hour turning movement counts collected by Trafficount, for the City of
Tukwila, in February 1989 during both the noon and PM peak periods, a level of service
(LOS) analysis was conducted at the intersection of SR 181 /South 180th Street, following
calculation procedures outlined in the 1985 Highway Capacity Manual. Both the noon
(11 :30 am. -12:30 p.m.) and PM peak (4:15 -5:15 p.m.) hours were examined to determine
existing level of service and potential intersection capacity of various improvement
alternatives.
An operational analysis was conducted at the intersection. Currently, the, intersection of
SR 181 /South 180th Street operates at LOS E (57 seconds of delay per vehicle) and LOS F
(64 seconds delay per vehicle) during the 1989 noon and PM peak hours, respectively, .
indicating jammed stop and go conditions.
Implementation of the proposed improvements will si increase mobility, lessen
accident potential and decreas delays. The proposed improvements would provide an
additional 10 to 15 years of service over existing conditions.
PROPOSED IMPROVEMENTS
The improvements recommended in this design are proposed for the intersection
improvements of the SR 181 /South 180th Street intersection in Tukwila, Washington, as
shown in Figure 1.
Proposed improvements include:
L Widening the south side of the west approach of South 180th Street to provide an
additional through lane and sidewalk.
Widening both the north and south approaches of SR 181 to the east to provide dual
northbound to westbound and southbound to eastbound protected left-turn lanes.
L Widening the east approach of South 180th Street to provide an exclusive
westbound to northbound right turn lane.
L New traffic signal system and lighting improvements.
L Signing, striping and channelization improvements.
Proposed improvements are described in detail below:
L SR 181 South Leg.
An additional 18 feet of roadway will be added on the east side of the existing five -
lane facility to provide an additional left-turn lane as shown in Figure 2.
L SR 181 North Leg
An additional 12.5 feet of roadway, including curb and gutter, will be added on the
east side of the existing five -lane facility to provide an additional left turn lane as
shown in Figure 3.
L South 180th Street West Leg
The existing urban street section will be widened an additional 18 feet to provide a
right turn lane at the intersection with SR 181 as shown in Figure 4. The widening
will include a six foot sidewalk on the south side. The addition of a six foot sidewalk
on the north side is also provided.
L South 180th Street East Leg
Similar to the west leg of South 180th Street, the improvement includes widening
the east leg 12.5 feet on the north side to provide a nght turn lane. In addition to
the street widening a 6 foot sidewalk will be reconstructed adjacent to the curb as
shown in Figure 6.
SIGNALIZATION
In addition to the roadway widening a. new traffic signal system will be installed at the SR
181 /South 180th Street intersection. Improvements include new signal poles, mast arms,
vehicle and pedestrian signal heads emergency pre- emption sensors, and luminaires.
This intersection will be interconnected with the existing signalized intersections Sperry
Drive /South 180th Street and 72nd Street /South 180th Street.
STORM DRAINAGE
Storm drainage facilities for widening the SR 181 /South 180th Street intersection will
consist of minor modifications to existing storm sewer systems in place on SR 181 and
South 180th Street. Runoff will be diverted to existing catch basins by adding catch basins
and inlets at selected locations.
Runoff outfall is to enter Green River. To eliminate adverse effects to the water quality of
the river during construction, bails of hay and silt fences will be installed to prevent erosion
along the west side of the river bank. Oil and grease separators are to be installed in
special catch basins to separate oil and grease from water.
EARTH WORK
Approximately 5,000 cubic yards of granule material from State approved sites will be used
to construct roadway embankment. Clearing , and grubbing work .would generate
approximately 500 cubic yards of extraneous materials winch will be removed from the site
and disposed of in accordance with construction requirements of the State and APWA
specifications.
PROPOSED IMPROVEMENTS
VISTING CONDITIONS
The Orillia Bridge (South 180th Street Bridge) over Green River is located along South
180th Street intersection on the west approach.
The existin structure, constructed in 1968, was desi ed for. HS20 Loading and is in good
condition. - The present roadway width is 60 feet. The superstructure consists of welded
steel plate girders continuous over spans at 37 feet -115 feet -37 feet supporting a light
weight concrete deck. Concrete abutments and wall piers are supported by treated tim
piles.
The South 180th Street Bridge will be widened an additional 20 feet to provide a right turn
lane at the intersection with SR 181. The widening will include 8 foot sidewalks on both
sides of the bride, and a 12 foot wide right turn lane on the south side of the bridge.
Currently, the bridge provides 2 to 4 foot sidewalks, See Figure 5. !Mating concrete
abutments, piers and treated timber piles will be extended to support three additional
welded plate girders with composite cnnerete deco.
The existt�' �
existin lenad� and vertical clearances will be maintained. The widened portion
will be designed for AASHTO HS20 Liveload matching that of the eadsting structure. The
bridge deck will be flared at the east abutment to provide a turning radius of 55 feet and an
8 foot sidewalk as both corners.
The proposed widening to the north side of the existing bridge will be limited to widening
the easterly 40 feet of the structure. The ' abutment will be extended to support a welded
steel plate girder which will attach to the existing exterior at the east pier. The roadway
deck will be flared to provide a turning radiu 55 feet and an 8 foot sidewalk. Again,
existing span lengths and vertical clearances will be maintained.
SEA TAC
IN T L
AIRPORT
TUKWILA
PROJECT
LXAT /ON
T23 N
T22 N
S.208th ST.
VICINITY MAP
CITY OF TUKWILA A
SR 181 / S. 18OTH STREET IMPROVEMENTS
% Panther
Lake
FIGURE 1
R/W
R/W
VARIABLE
3 10'
METAL BIN WALL
VARIABLE
r' r I
L. L.
10' 6'
L.
3' 4 I I' I I' 6'
Q
EXISTING
L.
6' 12'
TL L.T. L.
PROPOSED
CITY OF TUKWILA
SR 181 / S. 180TH STREET IMPROVEMENTS
VARIABLE
6' 10' 10' 3'
T.L.
VARIABLE
II' II' 4'
18'
TYPICAL ROADWAY SECTION
SOUTH LEG SR 181
LOOKING NORTH
L.T. L. = LEFT TURN LANE
R/W
R/W
op—
FIGURE 2
R/W
R/W
VARIABLE
VARIABLE
4' 11'
fit
10' 6 6' 13'
L. TL
EXISTING
6' 12'
T.L
L.T. L.
PROPOSED
CITY OF TUKWILA
SR 1A1 / S. 1MOTH STREET IMPROVEMENTS
VARIABLE
13'
VARIABLE
11'
TYPICAL ROADWAY SECTION
NORTH LEG SR 181
LOOKING NORTH
12.5'
R/W
17' S'S /W
R/W
4'
FIGURE 3 ,,
R/W
4'
R/W
36'
12' 6 6' 12'
L. T.L.
EXISTING
36'
CITY OF TUKWILA
SR 181 / 8. 180TH STREET IMPROVEMENTS
12'
R/W
R/W
TYPICAL ROADWAY SECTION
SOUTH 180TH ST (WEST LEG)
LOOKING EAST
R.T. L. = RIGHT TURN LANE, L.T.L. = LEFT TURN LANE
PRIVATE
PARKING
PRIVATE
PARKING
FIGURE 4
4' 12'
12' - 12'
L
Q
12' 6' 6' 12' 12' 4'
L.
T. L.
EXISTING
10' 12'
T. L.
PROPOSED
TYPICAL ROADWAY SECTION
SOUTH 180TH ST. (WEST LEG)
GREEN RIVER BRIDGE
LOOKING EAST
L.T.L. = LEFT TURN LANE
CITY OF TUKWILA
SR 151 / S. 140TH STREET IMPROVEMENTS
12'
12'
R.T. L.
1
20'
FIGURE 5 J
R/W
R/W
6' 6' 11'
50'
50'
11' 6' 6'
L.
T.L.
1'
EXISTING
11' 6 6'
11'
50'
50'
12.5'
R.T.L.
11'
1'
PROPOSED
CITY OF TUKWILA
SR 181 / S. 180TH STREET IMPROVEMENTS
TYPICAL ROADWAY SECTION
SOUTH 180TH ST (EAST LEG)
LOOKING EAST
R.T. L RIGHT TURN LANE, L:r.L.• LEFT TURN LANE
R/W
R/W
FIGURE 6
RAPEITSRM 'T.
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VERTi/r 20'
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