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UTILITIES ELEMENT BACKGROUND REPORT
CITY OF TUKWILA
COMPREHENSIVE LAND USE PLAN
UTILITIES ELEMENT BACKGROUND REPORT
2015 GROWTH MANAGEMENT ACT
UPDATE to the COMPREHENSIVE PLAN
Planning Commission Draft
April 2013
Page 1 TUKWILA COMPREHENSIVE PLAN UPDATED July 15, 2013
UTILITIES ELEMENT BACKGROUND REPORT
TABLE OF CONTENTS
1 INTRODUCTION AND SUMMARY 3
II DESCRIPTION OF KEY ISSUES 4
III EXISTING CONDITIONS AND FUTURE NEEDS 5
IV APPENDIX 15
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UTILITIES' M [ ROU REPORT
I INTRODUCTION AND SUMMARY
The State Growth Management Act (GMA) requires the City to include a Utilities Element within its
Comprehensive Plan consisting of the general location, proposed location, and capacity of all existing and
proposed utilities, including, but not limited to, electrical lines, telecommunication lines, and natural gas
lines (RCW 36.70A.070). The Utilities Element is a framework to provide utility service and facilities that
are efficient and predictable.
Guidelines for preparing the Utilities Element have been codified in the procedural criteria for preparing
and adopting Comprehensive Plans and development regulations under the Growth Management Act.
The Utilities element establishes a basis for decision - making that is consistent with Washington's Growth
Management Act, the Puget Sound Regional Council's Vision 2040 and King County's Countywide
Planning Policies, including targets for housing units and employment. These specific requirements are
fulfilled by the Utilities Background Report, Comprehensive Sanitary Sewer Plan, Comprehensive Water
Plan, and Comprehensive Surface Water Management Plan. These documents, along with the six -year
Capital Improvement Program and the City of Tukwila budget, are adopted by reference in the Tukwila
Comprehensive Plan. Individual districts and other utilities providers prepare and adopt their own
planning documents.
The 2013 Utilities Element Background Report Supplement summarizes and updates conditions for City
and non -City owned utilities. It includes a basic description of service providers, and indicates the most
important service and situation changes since the 2004 Growth Management Act update. Service
provider maps and maps that show the general location of facilities are shown in the Appendix.
The Utilities Background Report reviews the present supply of utility services and infrastructure. It
summarizes existing facilities, services and capacity and describes the ability of the respective utility
systems to meet the future levels and location of demand that result from Tukwila's forecast growth in
employment and households.
The utility services that are considered include: sewer and water services, surface water management,
solid waste, electricity, natural gas and telecommunications. The City of Tukwila and adjacent
municipalities and special districts provide sewer and water services. Surface water management is
provided exclusively by the City of Tukwila. The remaining utilities such as solid waste, electric power,
natural gas and telecommunications are provided to residents and businesses through franchise
agreements or via contract with the City.
Quantifying realistic future demand is necessary for planning infrastructure projects and providing
different types of utility services to meet future needs with adequate supply and capacity. Estimates of
future need are based on two basic factors: (1) the amount of employment and housing growth; and (2)
the location of employment and housing growth. The forecast growth is determined by forecasts from the
Washington Office of Financial Management, and growth targets allocated by King County's Countywide
Planning Policies. The location of growth capacity is defined by the adopted land use map contained in
Tukwila's Comprehensive Plan.
The City of Tukwila elected to be a designated regional growth center in 1995, and must prepare plans to
accommodate its targets for 4,850 new housing units and 17,550 new jobs by 2031. It is anticipated that
most of that household growth will occur in higher density housing within a developing Southcenter
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UTILITIES ELEMENT BACKGROUND REPORT
neighborhood. Additional housing growth will occur along Tukwila International Boulevard in or near the
Tukwila Village redevelopment project, in the vicinity of the light rail station at S. 154th Street, and in the
Tukwila South area, annexed to Tukwila in 2010. New employment will primarily be dispersed among the
Tukwila Urban Center, Manufacturing /Industrial Center and Tukwila South sub - areas.
II DESCRIPTION OF KEY ISSUES
Several key issues are considered in planning for utility needs.
• Service Extensions. Planned extensions of utility services are based on existing need or to
accommodate planned growth or growth targets.
• Coordination of Service Providers. In addition to its own water, sanitary sewer and surface water
utilities, Tukwila is served by three non -City sewer and five non -City water districts, which can
complicate interjurisdictional coordination. The City- managed utilities must be coordinated with
adjacent purveyors that provide utility services to portions of the City to correct deficiencies, solve
utility problems and accommodate growth.
• Concurrency and Implications for Growth. Concurrency requires that utility projects, along with
other capital facilities, be developed so that improvements are in place at the time they are needed to
meet growth and to accommodate growth targets.
• Environmental Sustainability. Environmental protection and restoration efforts are required in utility
planning, construction and operations to ensure that the quality of the natural environment and its
contributions to human health and vitality are sustained, and the effects of climate change limited.
Environmental sustainability is a key priority for the region as expressed in King County's Countywide
Planning Policies. This priority shall be implemented through utility planning and operations in
Tukwila through a range of activities from conservation practices to low impact development methods
• Residential Neighborhood and Sub -Area Vitality. Utility investments affect neighborhood quality
of life, and the ability to realize established visions for specific sub - areas.
Significant progress has been made in upgrading utilities in the residential neighborhoods since the
Comprehensive Plan was adopted in 1995. Ensuring high quality utility service in neighborhoods
remains a priority. Tukwila's Strategic Plan further emphasizes the importance of capital investment,
including utilities, as a means to ensure that sub -areas reach their potential and can accommodate
growth targets. These areas include Tukwila International Boulevard, the Southcenter/Tukwila Urban
Center area and the Manufacturing /Industrial Center area along East Marginal Way. The high costs
of undergrounding utilities must be addressed, as well as limiting the impacts of utilities on adjacent
areas.
• System Rehabilitation, Replacement and Retrofit. Much of the City's utility infrastructure has
reached or is near its life expectancy. Rehabilitation or replacement of these systems will be needed
to ensure their continued reliability. Federal, state and, local requirements continue to change and
require utility system improvements to comply with these requirements.
Much of Tukwila's infrastructure is 50+ years old, and requires planned and systematic replacement
and /or upgrades to ensure reliability. Planned upgrades are addressed in Tukwila's water, sewer
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UTILITIES ELEMENT BACKGROUND REPORT
and surface water system plans. Projects are scheduled and paid for through Tukwila's six -year
Capital Improvement Program. Additional non -city utilities will be upgraded to address technological
innovations, capacity constraints, and changed regulations.
III EXISTING CONDITIONS AND FUTURE NEEDS
City of Tukwila Water System
The City of Tukwila operates and maintains a water distribution system with approximately 40 miles of
water mains. It supplies over 1.5 million gallons /day to the residential and commercial customers of
Tukwila. Cascade Water Alliance provides the water that the City of Tukwila sells to customers with a
contract that runs through 2064.
The water utility supplies both potable (drinking) water and water to fire hydrants. Although
interconnected systems, these different services have different requirements.
Since the last Comprehensive Plan update in 2004, portions of the Allentown, Duwamish, Foster Point
and Ryan Hill neighborhoods have received upgraded or new water systems. The City of Tukwila is using
low- interest, long -term loans from the Public Works Trust Fund to finance the upgrade of water systems
within the City. The City continues its efforts to improve the cross - connection program by requiring
businesses to install a reduced - pressure backflow device to protect the water supply system when
changing their plumbing systems.
Since 2004, the City of Tukwila Water Utility has completed the following significant projects to ensure
that there is adequate capacity to meet growth targets:
• In 2007, the City installed a new 10" water line across the Green River Bridge between the Family
Fun Center and Andover Park East to provided capacity for targeted growth.
• 2008 —The City upgraded 1, 100 cubic foot water lines near S. 48th Street and Interurban Avenue
South both to address anticipated growth, and to repair remaining damage from the 2001 earthquake.
Future projects
During the planning period, the City of Tukwila Water Utility will upsize its existing 12" water line to a 16"
line in Andover Park East. It will construct a 2.5 million gallon reservoir to address potable water reserves
per Washington Department of Health requirements, as well as fire pressure needs to provide capacity to
serve growth targets, primarily for the Southcenter /Tukwila Urban Center area.
In addition, the Water Utility will meet the continued need for systematic maintenance and replacement as
water mains reach the end of their useful lifetime. (Figure 1 —Water System)
City of Tukwila Sanitary Sewer System
The City of Tukwila operates and maintains a sanitary sewer collection system with approximately 33
miles of gravity and force sewer mains, and nine lift stations. The lift stations pump approximately 60% of
all sewage in the City (approximately 460 million gallons).
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UTILITIES ELEMENT BACKGROUND REPORT
Since 2004, portions of Allentown, Foster Point and Duwamish neighborhoods received sanitary sewers.
The City of Tukwila is using low- interest, long -term loans from the Public Works Trust Fund to finance
installation of sewers in the unsewered areas. The annexation of Tukwila South has prompted additional
maintenance in anticipation of growth. In 2012, Tukwila's Sewer Utility rebuilt a line in street running from
Minkler Avenue South to South 204th. Side sewers will be provided by the developer when needed.
A boundary line adjustment with the Valley View Sewer District is in progress in the vicinity of 51st Avenue
South and Southcenter Boulevard. This change will better accommodate the service areas and
boundaries to the existing natural topography.
Future projects
In order to meet the needs for growth, as well as maintenance during the planning period, the City of
Tukwila is proposing a new lift station near 65th Avenue South and Southcenter Boulevard to replace an
existing sewer line that runs under 1 -405. In addition, portions of the sewers in the Tukwila Urban
Center /Southcenter area will be relined since they are reaching the end of their design life. (Figure 2—
Sanitary Sewer System)
City of Tukwila Surface Water Management System
The City currently owns, operates and maintains approximately the following surface water features:
FACILITY TOTAL QUANTITY*
• Asphalt Berm • 200 Linear Feet
• Ditches • 1,000,000 Linear Feet
• Pipes • 500,000 Linear Feet
• Catch Basins and Manholes • 12,000 Each
• Outfalls • 75
• Detention/Water Quality • 19
• Pump Stations • 4
* Actual quantities to be determined after GIS studies.
Changed Conditions
Since the 2004 update, significant regulatory changes have affected surface water management. This is
primarily due to requirements from the implementation of the National Pollutant Discharge Elimination System
(NPDES) Phase 11 permit. The Municipal Stormwater Permit was issued by the Washington State
Department of Ecology in 2007. The NPDES, a federal requirement under the Clean Water Act, regulates
storm /surface water and wastewater discharges to waters of the State. The permit requires that all
affected municipalities create and implement a specified Stormwater Management Program (SWMP),
which protects water quality by reducing the amount of "non- point" pollutants.
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UTILITIES ELEMENT BACKGROUND REPORT
While developing the 2013 Comprehensive Surface Water Management Plan, staff evaluated existing
field conditions, applicable regulations, and anticipated revisions to those regulations, in order to identify
program improvements that should be implemented. The 2013 Comprehensive Surface Water
Management Plan includes basin definitions, an inventory of fish blocking culverts, capital improvement
projects, regulatory compliance evaluation, low- Impact /no- impact development, and development
restrictions. It divides the City into nine drainage basins and assesses current deficiencies. The plan
emphasizes a greater importance on providing water quality and fish passage improvements. (Figure 3—
Surface Water System)
Clean Water Act
The Clean Water Act regulates discharges of pollutants into the waters of the United States and regulates
water quality standards for surface water. Major water bodies are classified by use according to State
water quality standards. Each use has specific water quality criteria. The Green /Duwamish is the only
surface water within the City's jurisdiction that has updated surface water quality standards. Tukwila must
comply with Phase II of the National Pollutant Discharge Elimination System (NPDES) permit, and any
Washington State Department of Ecology 303(d) listings for impaired water bodies.
Endangered Species Act (ESA) and Salmon Recovery Act
In 2000, Puget Sound Chinook salmon and the coastal Puget Sound bull trout were listed as threatened.
The City implemented an ESA Screening checklist as part of the SEPA process to assess potential
impacts to endangered species. In addition, the City serves on a committee from the local water resource
inventory area (WRIA) which develops watershed projects addressing salmon habitat concerns. The City
identified several capital improvement projects that are linked to the WRIA 9 salmon recovery efforts.
NON - TUKWILA WATER AND SEWER
Several adjacent, publically -owned water and sewer utilities operate within Tukwila.
Water District #125
Water District #125 serves a total of approximately 3,860 accounts in Tukwila. This includes
approximately 1,670 residential water accounts, 1,940 business accounts and 250 non - residential (i.e.
commercial /industrial and government /education) accounts. Per its 2011 Comprehensive Plan, Water
District #125 foresees no problem in serving expected growth within its Tukwila service area. Staff
indicate that some specific projects may require local infrastructure improvements, but basic facilities are
in place.
The water system along Tukwila International Boulevard is fairly strong and is projected to accommodate
most anticipated development during the planning period. Undersized water mains throughout the WD
125 service area are systematically being addressed by capital improvements as funds are available. A
recent intertie project has provided increased backup for fire pressure in this area. This upgrade will
facilitate anticipated redevelopment and growth. Should a specific development require higher fire flows
than are available at the time, it would be the responsibility of the developer to make the necessary
improvements to achieve the required flows.
A copy of Water District #125's most recent Comprehensive Plan (2011) provides a full evaluation of its
existing system and its ability to meet the anticipated requirements for water source, quality, transmission,
storage and distribution for the planning period. The Plan also includes a complete list of future water
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UTILITIES ELEMENT BACKGROUND REPORT
system projects and how they will be financed. The Plan is available at the Water District #125 office
located at 3460 S. 148th St., Tukwila, WA 98188.
Highline Water District
The Highline Water District serves approximately 550 accounts in Tukwila, including 100 non - residential
(commercial, government, non - profit), and 450 residential. The Highline Water district provides the
majority of water service in the Tukwila South area, annexed to Tukwila in 2010. The annexation
significantly enlarged the area that Highline serves within the City of Tukwila municipal boundaries.
Two recent projects were constructed specifically to meet anticipated growth in the Tukwila South area
during the planning period. They include:
• 2012 -- Through an Interlocal Agreement with Tukwila, Highline Water District completed the
Southcenter Parkway Extension project. It includes the extension /relocation of the existing water
mains along Frager Road from S. 180th St. and to S. 200th St as part of the new road construction.
The existing 8,500 LF aging main was nearing the end of its useful design life and was upsized to
serve future development in Tukwila South.
• 2011 - -The District constructed Orillia Road Water Main Improvements to serve the Tukwila South
area. It included installation of: 1) two pressure- reducing valve stations to bring the high pressures
along Southcenter Parkway to usable levels; and 2) a new water main along Orillia Road to provide
adequate fire flows to future Tukwila South projects, and to close the gap to the Tukwila Intertie.
In general, the District's infrastructure is able to meet the water demands within its boundaries in the City
of Tukwila. According to Highline's Comprehensive Plan, current requirements and future development
needs can be adequately met through systematic capital projects. Highline Water District will continue its
robust district -wide approach to replacing aging water mains, including some in Tukwila. A copy of the
current Comprehensive Plan with specific projects is available from the Highline Water District office at
23828 30th Avenue South, Kent, WA 98032.
City of Seattle
Seattle Public Utilities (Water) provide service to the northern portion of the City including industrial
connections along East Marginal Way South in Tukwila's Manufacturing /Industrial Center. The area is
built out, and no major projects are planned.
City of Renton Water Utility
The Renton Water Utility services a small eastern portion of Tukwila in the southeast portion area on the
eastern edge of the Tukwila Urban Center.
Water District #20
Water District #20 serves several properties on the western boundary of the city, between Military Road
and Tukwila International Boulevard.
Valley View Sewer District
The Valley View Sewer District is located generally south of Seattle, with a service area that includes part
of Seattle, as well as portions of the cities of Burien, SeaTac, Tukwila, and unincorporated King County. It
provides sanitary sewer service to the central and western portions of Tukwila. Presently, Valley View has
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UTILITIES ELEMENT BACKGROUND REPORT
agreements with the City which allow it to operate and maintain sewer facilities within Tukwila. In 2007,
the Valley View Sewer District changed its name from Val Vue Sewer District. The District neither owns
nor maintains wastewater treatment facilities; its flows are treated through contracted relationships with
the King County Wastewater Treatment Division, Southwest Suburban Sewer District and Midway Sewer
District.
Valley View serves approximately 8,000 connections in total. It has 170 commercial accounts and 1,909
residential accounts, for a total of 2,079 connections in Tukwila.
Growth
As of 2013, the Valley View Sewer District is preparing to exchange a portion of its territory with the City
of Tukwila sewer utility immediately west of 1 -5 in the vicinity of S. 144th and S. 151st Streets in order
better to serve the area based on its sloping topography.
Valley View's Comprehensive Plan indicates that projected development within the service area is limited
to that associated with infill development over the short term, and redevelopment over the longer term. An
increase in multi - family and commercial uses is anticipated.
During the planning period, several construction projects are scheduled to extend sewer service to
currently unsewered areas in Tukwila. The current Capital Improvement Program includes new sewer
construction in the following areas during the planning period: 1) Riverton Crest (project N -3) at Military
Road and S. 140th Street, planned for 2017, and 2) the Tukwila Loop Sewer Main (project N -13) located
near 158th Street, east of 42nd Avenue South, planned for 2022. Additional projects will be carried out in
coming years, and include continued sewer rehabilitation and replacement. Revenue sources for
financing capital expenses include rates, utility local improvement districts, bonds, grants and loans.
City of Seattle
Seattle Public Utilities (Sewer) provide service to the very northwest tip of the City of Tukwila in the
vicinity of 16th Avenue South, in the Manufacturing /Industrial Center.
City of Renton
The City of Renton serves a small eastern portion of the Tukwila Urban Center with sewer service. This
area is generally located between West Valley Highway and the Renton border from approximately S.
160th and S. 180th Street.
Additional Utilities Not Owned by the City of Tukwila
Solid Waste and Recycling
Collection, transport and disposal of solid waste in Tukwila is guided by the King County Comprehensive
Solid Waste Management Plan, the Seattle -King County Local Hazardous Waste Management Plan, and
the Washington State Solid Waste Management Plan. Through a competitive process, the City awarded a
seven -year contract in 2011 to Waste Management Inc. to provide solid waste, recycling and
compostables collection for residential, multi - family and commercial customers. The contract provides for
comprehensive solid waste and recycling program and competitive rates for the City. The cost of recycling
service for Tukwila residents and businesses is embedded in the respective garbage rates.
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UTILITIES ELEMENT BACKGROUND REPORT
Tukwila has adopted the King County Comprehensive Solid Waste Management Plan and the Solid
Waste Interlocal Agreement (ILA). These guiding documents form the basis for the City's solid waste,
recycling and waste reduction programs. Approximately 75% of Tukwila households and virtually all
businesses subscribe to solid waste and /or recycling services. This is a significant improvement since the
2004 Comprehensive Plan update. The remaining 25% self -haul primarily to King County's Bow Lake
transfer station in Tukwila, to surrounding transfer stations and other private yard debris facilities. The City
has considered implementing universal /mandatory garbage collection for Tukwila residents but residential
garbage collection remains voluntary. This issue will be considered again during the planning period.
Through the ILA provisions garbage collected in the City of Tukwila goes primarily to the Bow Lake
Transfer Station, located at South 188th Street and Orillia Road. Bow Lake Transfer Station has
undergone a major $44 million renovation since 2010, and is scheduled to be fully operational by the end
of 2013. The Bow Lake Transfer Station handles more than a third of the County's solid waste and will
have the capability to accommodate garbage, recyclables and yard waste debris. With newly installed
compactors, and facility expansion, Bow Lake is well equipped to accommodate future growth in the
region and facilitate disposal options when Cedar Hills Landfill reaches full capacity in 2025. Garbage is
ultimately trucked and disposed of in King County's Cedar Hills Regional Landfill.
Allied Waste /Republic will continue providing solid waste, recycling and yard waste collection through
their Washington Utilities and Transportation Commission certificates for recently- annexed areas in the
City including the Tukwila South area. During 2013, the City started the negotiation process for a new
franchise agreement with Allied Republic.
Telecommunications
Telecommunications services include both switched and dedicated voice, data, video, and other
communication services delivered over the telephone and cable network on various mediums, including,
but not limited to, wire, fiber optic, or radio wave. Either regulated or non - regulated companies may
provide these services. Cable service includes communication, information and entertainment services
delivered over the cable system whether those services are provided in video, voice or data form.
Telecommunication services follow growth and have capacity to match whatever growth occurs in
Tukwila. With new technologies, telecommunications utilities project virtually limitless capacity within the
planning horizon.
Through partnerships with franchised telecommunications companies, and completion of capital projects,
the City has a robust conduit infrastructure that would enable and facilitate future fiber optic connectivity
projects benefitting the City, its residents and business, and project partners.
The City participates in a connectivity consortium consisting of cities, and other public partners that would
construct and maintain a regional fiber -optic telecommunications system. This fiber -optic system would
provide system redundancies, and enhance communications networks, and emergency operations. At
some point during the planning period, the telecommunications network will be updated to fiber optic but
the exact schedule and locations are not available.
Cable and Satellite Television
The City of Tukwila has a non - exclusive franchise agreement with Comcast Corporation to construct,
operate, and maintain a cable system in compliance with the Federal Communications Commission
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UTILITIES ELEMENT BACKGROUND REPORT
(FCC) regulations. Comcast's network provides high- definition television capacity and high -speed internet
access through cable modems, and includes coaxial and fiber optic cabling systems deployed
underground and overhead using utility poles leased from power and telephone companies. Future
growth is most likely occur relative to data /internet service, as more content become accessible online.
These broadband services can be provided over fiber optic networks, cable networks or DSL telephone
networks.
Satellite television competes directly with cable television by delivering hundreds of channels directly to
mini - dishes installed in homes and businesses throughout Tukwila.
Wireline and Wireless Communications
Multiple companies offer telecommunications services in Tukwila including integrated voice and data, and voice
over internet telephony (VoiP) technology. Century Link, the Incumbent Local Exchange Carrier(ILEC) is now
joined by several Competitive Local Exchange Carriers (CLECs) in providing more communications service options
to Tukwila residents and businesses.
Since Washington Utilities Trade Commission (WUTC) regulations require Century Link to provide
adequate PTSN telecommunications service on demand, there are no limits to future capacity, although
demand for land lines is declining. Additionally, VoIP telephone service should only be restricted by
bandwidth constraints on fiber optic networks that provide this digital service.
Electric Utilities
Tukwila's electricity is provided by Puget Power and Seattle City Light. Electric utilities in Tukwila share
what is described as an "integrated regional electric system." Regardless of ownership, the elements of
the system are designed and operated to work in a complementary manner. The elements include
transmission lines, substations and generation facilities. Seattle City Light and Puget Power continually
consider means to expand supply and upgrade equipment since the law requires them to serve all
customers requesting service. Current capital facilities plans and six year finance plans which include
complete project information are available from Seattle City Light and Puget Sound Energy. (Figure 4 —
Electricity Providers)
Puget Sound Energy
Puget Sound Energy (PSE) is an investor - owned, private utility that is regulated by the Washington
Utilities and Transportation Commission (WUTC). It provides electric service to over 900,000 metered
customers within the company's 4,500 square mile service territory. This territory encompasses nine
counties in western and central Washington. PSE provides electrical service to approximately 3,800
customers in Tukwila who are located generally south of South 160th Street, including the Urban Center.
Puget Sound Energy builds, operates and maintains an extensive electric system consisting of generating
plants, transmission lines, distribution systems and substations. It is a hydroelectric -based company
purchasing about 40 percent of its power from utilities that own five large hydro facilities on the Columbia
River. Six Puget Sound Energy -owned hydroelectric plants, located on the Nooksack, Baker, Snoqualmie,
White and Puyallup Rivers, add to the hydro base on the west side of the Cascades. Other Puget Sound
Energy owned or partly owned sources include four coal -fired plants (in Centralia, Washington, and
Colstrip, Montana), and six gas- and oil -fired plants.
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UTILITIES ELEMENT BACKGROUND REPORT
Within Tukwila, Puget Sound Energy owns and maintains transmission lines which bring generating
facilities to principal substations. The Talbot- O'Brien transmission lines serves Tukwila and the
surrounding area with 230 kilovolt (kV) high - voltage transmission lines that run north -south within the
Interurban Corridor, moving bulk power from transmission stations in Renton and Kent. Both of those
stations generally supply electrical energy to the southern half of King County, an area much larger than
the City of Tukwila. Several 115 kV transmission lines and a number of neighborhood distribution
substations are located within the city, and deliver electrical energy to other neighborhood substations in
communities adjacent to Tukwila.
PSE's Integrated Resource Plan (IRP) details how the utility will serve future needs during the planning
period. The current plan details the energy resources needed to reliably meet customers' wintertime,
peak -hour electric demand over the next 20 years. The plan, which will be updated in spring 2013,
forecasted that PSE would have to acquire approximately 4,200 megawatts of new power - supply capacity
by 2031. This resource need is driven mainly by expiring purchased -power contracts and expected
population and economic growth in the Puget Sound Region. The IRP suggests that roughly half of the
utility's long -term electric resource need can be met by energy efficiency and additional wind -power
supply. The rest of PSE's gap in long -term power resources is likely to be met most economically with
added natural gas -fired resources.
Future Projects
Specific construction that is anticipated for Tukwila includes the following:
• 2013 - -New 115 kV transmission line between the future Briscoe Park Substation and the existing
Boeing Aerospace Substation.
• 2014 -- Replacement of the existing 115 kV underground cable between the Nelsen and Tukwila Cable
Stations. The existing cable was installed in 1974, and the new cable will increase reliability and
capacity.
• Near term -- Vegetation management within the 230 kV transmission line corridor, for NERC
compliance.
• Future—
o Improve Briscoe Park Substation, located in the center of the Tukwila South development,
providing increased capacity and reliability in the area.
o Enlarge the existing Renton Junction Substation, providing increased capacity and reliability
in the area.
o Build a 115 kV underground cable connecting the existing Nelsen Cable Station and Renton
Junction Substation, to facilitate expansion of Renton Junction Substation.
o Build a 115 kV transmission line connecting the existing Southcenter Substation and the
future Briscoe Park Substation. This future line would either be overhead or underground and
would provide increased capacity and reliability.
o Build a Substation near Southcenter Boulevard and South 180th Street to provide increased
capacity and reliability in the area.
o Rebuild the existing 115 kV transmission line that runs east from the existing Nelsen Cable
Station with a larger conductor.
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UTILITIES ELEMENT BACKGROUND REPORT
Seattle City Light
Seattle City Light (SCL) is the City of Seattle -owned electrical utility. Its total service area covers
approximately 131 square miles, including all of Seattle and some portions of incorporated and
unincorporated King County to the north and south of Seattle. Seattle City Light serves the northern
portion of Tukwila, including the Manufacturing /Industrial Center (MIC) via franchise agreements.
According to 2011 data, SCL has approximately 5,700 residential and 1,000 commercial customers in
Tukwila.
Both a retailer and wholesaler of electric power, the utility generates 70 percent of the power it sells to
retail customers from its own facilities. The largest facilities are the hydro - generating plants of the Skagit
Project. Another smaller hydro - generating facility is the Cedar Falls Dam on the Cedar River.
Seattle City Light owns and maintains approximately 649 miles of transmission lines which transmit power
from the Skagit and Cedar Falls generating facilities to 14 principal substations. Power is distributed from
these principal substations via high voltage feeder lines to numerous smaller distribution substations or
pole- mounted transformers
Seattle City Light (SCL) is a municipally owned utility provides service to customers in the City of Seattle,
portions of unincorporated King County, and via franchise agreements to several King County cities
including the northern portion of Tukwila.
SCL's 2012 Integrated Resource Plan (IRP) outlines how the utility will meet anticipated customer needs
over the next 20 years. According to the IRP, Seattle City Light is likely to meet the energy needs of
Seattle and Tukwila through 2022 with ongoing conservation programs, seasonal market purchases, and
existing power contract flexibility. Conservation programs will continue as the resource of choice, that is
lower cost, flexible, advantageous for economic development, and with minimal environmental impacts.
After 2022 and through 2031, energy needs will be met by additional power from renewable resources
including landfill gas, new hydro efficiencies, waste wood biomass, and wind resources.
SCL owns and maintains transmission lines which bring power from the Skagit and Cedar Falls
generating facilities to a number of principal substations. Power is distributed from these principal
substations via high - voltage feeder lines to smaller distribution substations or pole transformers. These
reduce voltage to usable levels for customers.
Tukwila is served both from Seattle City Light's Duwamish Substation in Tukwila and from the Creston -
Nelson Substation in Seattle. Distribution feeders from Duwamish and Creston - Nelson deliver energy to
the area's customers.
Future Projects
To maintain current infrastructure and increase transmission reliability, SCL plans to build new feeders
from the Duwamish Substation. The timing of the new feeders will be dependent on the demand
schedules of large power customers. SCL will replace existing H -frame structures with taller poles in order
to maintain reliability of the Creston - Duwamish transmission line and to augment distribution capacity
from the Creston Substation.
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UTILITIES ELEMENT BACKGROUND REPORT
Natural Gas
Puget Sound Energy, an investor -owned utility, builds, operates and maintains natural gas facilities
serving Tukwila. Puget Sound Energy purchases gas from other regions and manages the distribution of
natural gas to customers within its service area. This involves pressure regulation and the development
and maintenance of distribution lines. PSE builds, operates and maintains natural gas facilities serving
about serves over 750,000 gas customers in six counties, including approximately 3,400 customers in
Tukwila.
Per its 20 -year Integrated Resource Plan (IRP), no major gas main improvement projects are planned for
Tukwila at this time. Puget Sound Energy covers virtually all of Tukwila with their main distribution lines.
Overall, the utility foresees no difficulties in meeting future demand during the planning period. No major
improvement projects are planned at this time. (Figure 5— Natural Gas Provider)
July 15, 2013 14
Highline water district intertie
Water district 75 intertie
Water district #75 intertie
UTILITIES ELEMENT BACKGROUND REPORT
IV APPENDIX
99 SDiiectorS
King
County
Emergency S5
Seattle Intertie
Supply Station 10A
(Oxbow)
Emergency SS
Seattle Intertie
Supply Station 10
(East Marginal)
Lake
Washington
Supply Station 00
/ (Ryan Hill)
WD 125 Intertie
(Duwamish 2)
King Coun
WD125 - WD 20
Intertie
WD125 - Seattle
- Skyway Interties
WD 125 Intertie
(131st PI)
ink
irWD125- Seattle r - gL, .,. iw
Intenies// 11( k r
Wait
sel
]ts
WD125 -
Tukwila
Intertie
North Hill Pump
Station, Reservoir,
and PRV
Supply Station 15
(Christensen)
Highline
Crestview Pump
Highline Crestview
Reservoir
Supply Station 13
(Southcenter)
, 1111' SS 14
:West Valley)
O0a ar
r7 Ir' a
Highline McMicken
Pump & Well
1
Supply Station 16
(Crystal Springs)
Hlghline Water
District Intertie (3)
Kent
Intertie
Rention
Intertie
Ket1,t
A
110.5 0.25 0 0.5 Miles
S
1
Path W ILong Range Preec1s12014 CompFlanUpdatetDag
Figure 1
Tukwila
Water
System
Legend
Water Districts
Highline Water Service
Renton Water Service
— Seattle Water Service
1-7 Tukwila Water Service
WD 125 Water Service
WD 20 Water Service
= Future Tukwila
Water Facilities
n Tukwila Interties
PRV
> PumpStation
▪ SS Emer PRV
A SS /PRV
Reservoir
▪ WD125 Interties
Pipeline Diameter
2-4
6 -8
10 -12
14 -16
18 -24
Due Saved: 3i13af20131 43:38 PM
July 15, 2013 15
UTILITIES ELEMENT BACKGROUND REPORT
599
5 tg;to" St
Seattle
Lake
Washing.toi:
King \�
County '\`,
Burie-r
King County
BN
Lift Station
Commercial Center
Lift Station
No. 9
Foster Point
Lift Station
No. 8
Lift Station
No. 6
Lift Station
No. 5
$ \, L
Lift Station
Lift Station
No. 12
.. Lift Station
No. 3
Lift Station 1
No. 4
10.5 0.25 0 0.5 Miles
Slog Sty
Ken[
0
Figure 2
Tukwila
Sewer
System
Edit to show ValVue/Tukwila Bound
Legend
KC Interties
Lift Stations
A Metro
A Other
A Private
A Tukwila
PipeType
Force Main
Pipeline Diameter
- 8" and Smaller
10 -12"
14 -36"
- 38 -54"
- 56 -96"
KC Treatment Plant
Drainage Basins
SewerService
n No Sewer
I Renton Sewer
I Seattle Sewer
Tukwila Sewer
Valley View Sewer
July 15, 2013 16
UTILITIES ELEMENT BACKGROUND REPORT
Lake
Washington
Seattle
King
County
King County
10.5 0.25 0 0.5 Milesi'
MM
/ S 204 St
Ken;
Q
Path. W.OLong Range Prolec'ISt2O14 CompPlanUpdate',GraphicsBement.MepslSurfaceWatecmxd
Figure 3
/4. ILA . 4�
Surface
Water
Facilities
Perteet is surveying Tukwila South so
we won't have info for a few
months
Legend
Closed Pipe
Culvert
- Ditch
- Stream
- Trench Drain
Detention Ponds
-Pump Stations
Waterbodi es
Da4 Saraa 0510,K1 5 14006 PM
July 15, 2013 17
UTILITIES ELEMENT BACKGROUND REPORT
Lake
Washingtc:.
,Seattle
King
County
King County
10.5 0.25 0 0.5 Miles
1
—7 201 St
E ie�lh9ei u.ay P,oviders.mxd
Figure 4
Electrical
Service
Providers
Legend
PSE Substation Existing
• PSE Substation Future
PSE Line Existing
PSE Line Future
— SCL Trunk Line
Electrical Service Area
' Puget Sound Energy
Seattle City Light
c,e_a...
July 15, 2013 18
UTILITIES ELEMENT BACKGROUND REPORT
Lake
Washington:
iu_H(
f
10.5 0.25 0 0.5 Miles /J
I
—1 / S 204 St
0I
PaTh. Ra je °-ojeI L ". CompPla I� 1 l -Gran k= mealM¢ s LiesProwder8mxtl
Figure 5
Natural
Gas
Provider
Legend
High Pressure Lines
PSE Service Area
.1. Saved'. 05130!2013 1':09 54 PM
July 15, 2013 19