HomeMy WebLinkAboutSEPA EPIC-198-82 - CITY OF TUKWILA / PUBLIC WORKS - 1982 COMPREHENSIVE WATER PLANCOMPREHENSIVE WATER
PLAN 1982
EPIG198 -82
w "'' 4 City of Tukwila
6200 Southcenter Boulevard
�� 2p Tukwila Washington 98188
\ • Gary L VanDusen, Mayor
or Y
;1906
7 February 1983
State of Washington.
Department of Ecology
Olympia, WA. 98504
ATTN: SEPA Register
• SUBJECT: Final Declaration, Comprehensive Water Plan
Final Declaration, Comprehensive Sewer Plan
Inl accordance with the provisions of .WAC- 197 -10 -340 (7), we enclose one
copy each of the Final Declaration of Non - Significance for the City of
Tukwila Comprehensive Water and Sewer Plans. We request that these actions
be entered into the SEPA Register as provided in the State Environmental
Policy Act Guidelines. We have enclosed for your records a copy of the
Proposed DNS which was circulated to agencies with jurisdiction prior to
issuance of the final DNS now before you. If additional information is
needed, please advise our office at 433 -1849.
TUKW '' PLANNING DEPARTMENT
M. Caughey
ssociate Planner
xc: Planning Director
Public Works Director
CITY OF TUKWILA
OFFICE OF COMMUNITY DEVELOPMENT
FINAL
DECLARATION OF NON-SIGNIFICANCE.
Description of proposal
•
• ••
Comprehensive Water Plan
Proponent City of Tukwila
Location of Proposal Tukwila Planning Area
Lead Agency
Of Tukwila File No. EPIC-198-82
This proposal has been determined to 4NOVii/not have) a significant
adverse impact upon the environment. An EIS (IX/is not) required
under RCW 43..21C.030(2)(c). This decision was made after review
by the lead agency of a completed environmental checklist and other
information on. file with the lead agency..
Responsible Official Brad Collins
Position/Title Planning Director
Date --Mr1.4.-tu. 1 lit3 Signature
COMMENTS:
a-c-e-ct
This Declaration of Non-Significance applies only to'the legislative
act of adopting the Comprehensive Water Plan. Separate environmental
• assessment shall be conducted for any project which implements the
Comp.. Plan. •
CITY•OF TUKWILA
OFFICE OF COMMUNITY DEVELOPMENT
XXXXXXEMAIS PROPOSED
DECLARATION OF NON - SIGNIFICANCE
Description of proposal
Proponent.
Comprehensive Water Plan
City of Tukwila
Location of Proposal
Lead Agency
Tukwila Planning Area
City of Tukwila, WAC 197 -10 -205.
File No. EPIC - 198 -82
This proposal has been determined to QUXXrk(/not have) a significant
adverse impact upon the environment. An EIS ()5X /is not) required
under RCW 43.21C.030(2)(c). This decision was made after review
by. the . lead agency of a completed environmental checklist and other
information on file with the lead agency.
Responsible Official
Position /Title
Brad Collins
Planning Director
Date 1 1/11/83 'Signature e„ ,A
A
COMMENTS:
This Declaration of Non - Significance applies only to the legislative act of
adopting the Comprehensive Water Plan. Separate environmental assessment
shall be conducted for any project which implements the Comprehensive Water
Plan.
•
4 City of Tukwila
1909
6200 Southcenter Boulevard
Tukwila Washington 98188
Frank Todd, Mayor
M EMORANDUM
TO: Brad Collins , Planning Director
FROM: Mark Caughey, Associate Planner
DATE: 8 February 1983
SUBJECT: SEPA Review -- Comprehensive Water & Sewer Plans
This memo is intended to supplement the data contained in my memo to you
dated 1 February 1983 in which the comments deceived during circulation of
the proposed DNS's for these comprehensive plans were described. As you
know, the 15 -day comment period for the proposed DNS ended on 26 January 1!);
1983. However, most of the agencies returning comments did not do so in
a timely manner. Late comments were noted in the February 1st memo, and
were considered in the decision to issue a final DNS on these actions,
even though SEPA does not require us to consider late comments.
Since the time at which the February 1st memo was prepared, a few more ; ,
comment letters have come dribbling -in. While we should not reevaluate
our decision to issue the final DNS's, perhaps we should at least acknow-
ledge receipt of these items and summarize their content:
City of Renton Public Works -- (Regarding water plan)
- Provided verbal description of Renton's water service are and included
a map of the system
- Suggested that Renton should serve the Burlington Industrial area south
of Longacres, since much of the needed infrastructure is already pro-
vided by Renton
- Suggest Tukwila reconsider joint reservoir project to serve Skyway Hill
area; full transfer of the area to Renton's service not desireable.
- Suggested further discussion between both Renton and Tukwila staff as
both jurisdictions are currently revising their service area comp. plans.
• •
Memo - -Brad Collins
Page 2
Seattle Water Department -- (Regarding water plan)
- - Stated agreement with the Declaration of Non - Significance
- - Questioned the assumption under Alternative 4, page 12 regarding the need
for a pump station; existing gravity elevation gradient should be suffi-
cient to fill tank
•
Seattle Water Department
Kenneth M. Lowthian, Superintendent
Charles Royer, Mayor
February 1, 1983
Mr. Brad Collins, Planning Director
City of Tukwila
6200 Southcenter Boulevard
Tukwila, WA 98188
RE: DNS on Comprehensive Water Plan
Dear Mr. Collins:
w�6
FEB 7 1983]
CITY OF TUt u..A
PLANNING DEPT.
The Seattle Water Department has reviewed the Comprehensive Water Plan and
has only a few comments. We fully agree with the Declaration of
Non - Significance.
It is obvious the plan has been in the works for a period with the comment
on Attachment, Page A -2 and top of. Appendix .B, Page 10 regarding the
Water Purveyor Contract which we are pleased was consummated on April 8, 1982.
We question the comment on Page 12, discussing Alternative 4, regarding the
need for a pumping plant. Constructing the tank at an elevation of 360 feet
will preclude the need of a pump station since the Seattle hydraulic gradient
is about 440 feet, sufficient to fill the tank.
We appreciate the opportunity to review your Comprehensive Water Plan.
Sj,raGerely,
KENNETH M. LOWTH
Superintendent o ter
KML:pod
Seattle Water Department— Exchange Building, 11th Floor
821 Second Avenue, Seattle, Washington 98104
• •
OF R,/z/
�$ ® o PUBLIC WORKS DEPARTMENT
n rn
0,9A
91, SEPIE�O�P
BARBARA Y. SHINPOCH
MAYOR
January 26, 1983
DESIGN /UTILITY ENGINEERING • 235 -2631
MUNICIPAL BUILDING 200 MI LL AVE. SO. RENTON, WASH. 98055
City of Tukwila
6200 South Center Boulevard
Tukwila, WA 98188
nuDD
DEB 7 1983
CITY OF TUKWILA
PLANNING DEPT.
Attention: Mr. Brad Collins
Subject: City of Tukwila Comprehensive Water Plan
Dear Sir:
Thank you for the opportunity to review your Environmental Check-
list. I would like to take this opportunity to clarify the City
of Renton's facilities, service area and future planning efforts.
1. Existing Service Area
I've attached a drawing of our latest water system map.
As shown, we provide water service to all of our corporate
limits, and in addition, serve the Container Corporation
property. Andy's Tukwila Station is provided water through
City of Renton mains fed from a wholesale connection off of
Independent Water Company.
2. Renton Water System Operation
On the borders of Tukwila, Renton operates three pressure
zones: 192' HGL,Central Business District and Valley System.
The static pressure is about 70 psi on the Valley floor.
Renton has an inter -tie with Tukwila on SR 181 near Cello Bag
Company. West Hill 480' Reservoir. The City is beginning con-
struction at a 1.3 million gallon reservoir in a joint project
with Water District No. 63 in the Skyway neighborhood. West
Hill 360' Pressure Reduced. This is an intermediate pressure
zone on our West Hill pressure & reduced from the new West Hill
Tank.
In general, the City of Renton is independent of the City of Seattle
(except for one small neighborhood) and utilizes its own ground and
well water supplies.
3. Future Valley Distribution Mains
The City is completing its grid-iron of large 24 ", 16" and 12"
water mains in the Valley area. S.W. 27th Street's new 12" has
City of Renton - 2 January 26, 1983
been installed up to Valley Parkway. The new Valley Parkway
street improvements will include a new 12" or 16" watermain,
work is scheduled to begin in the spring. The City will include
in its future system improvements a 12" watermain east from the
Tukwila /Renton Inter -tie back to the Valley Parkway. The exten-
sion of S.W. 27th St. west to connect with Strander Boulevard
will include installation of a 12" or 16" watermain to bring
the Andy's Diner area back into the City - supplied 192' HGL grid
system. A new 8" watermain off of the Monster Road City 12"
watermain will provide water service to the Nelson Dairy Barn
Yard in late 1983.
4. Independent Water Company
The City of Renton has a contractual arrangement to purchase
water wholesale from the Independent Water Company to provide
service to our Andy's Diner area. If Tukwila proceeds with
take -over of the Independent Water Company area, there are
two items of concern; A. The inside Renton Nelson Barn Yard
area be transferred to Renton, B. The existing wholesale water
arrangement between Renton and the Independent Water Company
be continued.
Tukwila East Service Area
The area owned by BNSF Burlington Northern lies east of the main
railroad tracks and is encircled on three sides by the City
of Renton. Water system and sanitary sewers will be provided
in the development of Valley Parkway along the east edge of
this area late this year, all within the City of Renton.
While it appears that Tukwila has in its Comprehensive Plan
a schematic layout for water system improvements, the cross-
ings of both the Burlington Northern and Union Pacific rail
tracks and the P -1 Channel are very expensive. It is our pro-
posal for the City of Renton to provide water service to this
area, much of the necessary watermains are in place.
Skyway Area
The City of Renton is proceeding with water system improvements
on the Skyway Hill. In addition, with our new reservoir project,
a 480' HGL, the City is also considering a new reservoir in the
Black River Quarry area. We have suggested to Tukwila a joint'
reservoir project, but apparently Tukwila has little interest
in a new reservoir here at either the 192' HGL or 360' HGL opera-
tion pressure level.
The City of Renton staff has been involved with the Water Dist-
rict No. 125 /Tukwila discussions on the old 6" Beacon Coal Mine
Road watermain. We feel the City's cost for upgrading this small
service area is in excess of $70,000. Renton is not in a posi-
tion to take over this area and subsidize the necessary recon-
struction of this main. The City could consider transfer of this
area to Renton only if the outside - Renton customers fully pay
for the costs of improvements to City Standards.
City of Renton - 3 - January 26, 1983
Our staff in Renton would be glad to meet with members of the City
of Tukwila staff. We are in a similar process of upgrading our
water and sanitary sewer Comprehensive Plan.
Your assistance on this matter is appreciated.
Very truly yours,
Rs4.Rkg,6‘--
Robert E. Bergstrom, P.E.
Engineering Supervisor
REB:jft
Attachment
cc: Richard C. Houghton
3 1983
DEPT.
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•
City of Tukwila
6200 Southcenter Boulevard
Tukwila Washington 98188
Frank Todd, Mayor
MEMORANDUM
TO: BRAD COLLINS, PLANNING DIRECTOR
FROM: Mark Caughey, Associate Planner
DATE: 1 February 1983.
SUBJECT: Comments Regarding Comprehensive Water /Sewer Plan SEPA Documents
As you know, our consultant Horton - Dennis Associates has transmitted copies
of the proposed Declarations of Non - Significance for the Comprehensive
Water and Sewer Plans to outside agencies with permit jurisdiction or sub-
stantial expertise in those topics. The fifteen -day comment period ended
on 26 January 1983, with the following agency responses:
A) Municipality of Metropolitan Seattle (Metro)
- No adverse impacts to Metro facilities anticipated.
Phillip M. Botch Associates (representing Water District 125)
- Concerns about adjustments between Tukwila water utility and Water
:.Districts 125 and 75 service area boundaries as described within
the plan documents.
C) Department of Planning & Community Development -King County
- Request for transmittal of the complete text of both plan documents.
- Concerns expressed about potential expansion of city utility service
boundaries into adjoining special district jurisdictions, other
municipalities and unincorporated areas. Request for more definite
coordination with. County personnel in further development work on
both plans.
D) Department of Public Works -City of Kent (received late)
- Technical data indicates a new Tukwila pump station would be needed
to serve the "south service area': if transferred to our jurisdiction.
- Service boundary adjustments vis -a -vis annexation will be resolved
by the B.R.B.
- Elimination of pump station #8, might hinder service capacity capabili-
ties relative to intensive land use pattern already established in the
vicinity of the south service area.
Page -2-
BRAD COLLINS, PLANN, DIRECTOR
1 February 1983
It appears from the weight of comments received that the service boundary
adjustment issue encompasses a number of complex technical and political
components which will require extensive investigation, exhaustive examina-
tion of service delivery alternatives and convenient opportunity for rate-
payer and agency input on any boundary adjustment decision. SEPA envisions
that such discussion would take place in the context of an environmental
impact statement. While there is considerable merit to the argument of
initiating the EIS process at the comprehensive planning stage, as we have
already acknowledged, imcremental EIS review of major service boundary
adjustments is they are proposed subsequent to adoption of the comprehensive
plans is defensible and may be preferable, since the limits of such proposed
adjustments will be more clearly defined and the significant issues of
concern narrowed. A more complete, more useful EIS document with greater
decision- making value may result by waiting until a specific plan -
implementation boundary adjustment is proposed.
I suggest that we issue a final Declaration of Non - Significance, refer same
to the Department of Ecology headquarters office as specified in
WAC 197 -10- 340(7), then proceed to legislative adoption of the plan documents.
MC /blk
xc: (with attachments)
Public Works Director
Senibr Engineer
Pat Butler
CITY OF MHT
Mr. Brad Collins, Planning Director
City of Tukwila
6200 - Southcenter Boulevard
Tukwila, Washington 98188
January 28, 1983
Reference: Comprehensive Sewer Plan Environmental Checklist
Dear Mr. Collins;
The Public Works Department of the City of Kent has reviewed the above referenced
plan and checklist and has the following comments:
1. As noted in the checklist, the South Service Area is also within the
City of Kent's sphere of interest. Kent's 1981 Comprehensive Sewerage
Plan indicates that the South Service Area can be serviced on a gravity
basis from an existing METRO trunk sewer on S. 212th Street. It appears
that Tukwila would have to construct another pump station to service
this area.
Presently, if properties abutt Kent's City limits, the City is requiring
annexation or an attempt to annex before utility service will be granted,
The King County Boundary Review Board will make the final determination
regarding utility service in the South Service Area,
2. The Comprehensive Sewer Map proposes the elimination of Pump Station #8
located in Southcenter South, and providing a new gravity system that would
connect to a City of Kent trunk sewer at West Valley Highway and S. 192nd St,
Since this system services a large commercial, industrial, and manufacturing,
section of Kent, including the Boeing Company, a detailed analysis would
be required to determine whether the system has the capacity to service the
Southcenter South Area.
Thank you for the opportunity to comment on Tukwila's Comprehensive Sewerage Plan,
Please call if you have any questions.
GG:mw
Very truly yours,
D. E, Wickstrom, P,E.
Director of Public Works
Gill, P.E.
ineer
220 4th AVE. SO., / KENT,WASH I NGTO N 98032-5895 / TELEPHONE (206) 872 -3300
"2-:11-7.1>
King County Executive
Randy Revelle
Department of Planning and Community Development
Holly Miller, Director
Mr. Brad Collins
Planning Director
City of Tukwila
6200 Southcenter Blvd.
Tukwila, WA 98188
RE: Propose
Dear Mr. Collins:
January 26, 1983
kwila Water and 'Sewer. Plans
On January 20, 1983, this office received copies of Proposed De-
clarations of Non - Significance for the City of Tukwila's Compre-
hensive Water and Sewer Plans. We note that both plans propose
the extension of service to presently unincorporated areas. In
order to extend such service, King County Chapter 13.24 requires
that the city must have its comprehensive water and sewer plans
approved by the King County Council. This approval requirement
should be noted on the checklists.
In addition to this legal requirement, we have a great need for
the type of information the City's water and sewer plans would
provide. Tukwila abuts or overlaps with Water Districts 25, 75
and 125, the City of Kent, Val Vue Sewer District and King County
Sewer and Drainage District No. 4. In order to properly evaluate
the strengths and weaknesses of these systems we need to know the
details of Tukwila's water and sewer systems.
In summary, we are anxious to receive both a water and sewer compre-
hensive plan from the City of Tukwila. We are available to work
with the City during the development of these plans. It has been
our experience that County input during the finalization of sewer
and water plans speeds up and simplifies the County review and
approval process. As you may proceed with the development of the
City's plans, please feel free to call me or Gene Peterson at 344-
5286.
RCC:GP:mt
Si
RALPH C. C•' BY
Utilities Coordinator
Building & Land Development Division 450 King County Administration Building 500 Fourth Avenue Seattle, Washington 98104 (206) 344-7900
N
LO 0
1908
City of Tukwila_
6200 Southcenter Boulevard
Tukwila Washington 98188
Frank Todd, Mayor
MEMORANDUM
TO: Brad Collins, Planning Director
FROM: Byron G. Sneva, Public Works D.
DATE: January 25, 1983
SUBJECT: Comprehensive. Water Plan - Phil Botch Letter Dated January 21, 1983
The Comprehensive Water Plan for the City of Tukwila is summarized
in Chapter 2 entitled Summary Recommendations-. Two of. the recommend-
ations deal with the subject "Takeover" that Phil Botch alludes to
in his letter of January 21. :These issues are political. and hinge
primarily on the economics of operation and /or the quality of water
service that can be improved in these areas. The-recommendations
further Cite the coordinating. and.cooperative nature in which these
changes might be made and in which they. are being discussed.. There
is not in the mind of any'of the participants that there is any adverse
environmental impact: I. respectfully submit that there is no reason
to prepare an E.I.S. on this Comprehensive Water Plan for the reasons
stated.
xc; file
•
Horton Dennis & Associates, Inc.
Consulting Engineers
January 25, 1983
Mr. Mark Caughey
City of Tukwila
6200 Southcenter Boulevard
Tukwila, Washington 98188
SUBJECT: DISTRIBUTION LIST - PROPOSED DNS
COMPREHENSIVE WATER & SEWER PLANS
Gentlemen:
Please find below a list of where each of the above mentioned plans were
sent. The cover letter that accompanied these plans is also included.
COMPREHENSIVE WATER PLAN
. Independent Water District
. King County
. Water District No. 75
. Water District No. 125
. City of Renton
. City of Kent
. Department of Social & Health Services - Washington State
. Department of Ecology - Washington State
COMPREHENSIVE SEWER PLAN
F
. Department of Social &.Health Services
. King County
. City of Renton
. City of Kent
. City of Seattle
. Val Vue Sewer District
. Metro - Wastewater Treatment Division
. Department of Ecology - Washington State
. PSCOG, King Subregional Council
If you have any questions, please contact us.
Sincerely,
HO
ENNIS & ASSOCIATES, INC.
atri c
a
PJB:reb
6133 Sixth Ave. South, Seattle, Washington 98108 • Phone 767-3456
CONSTJIJTING ENGINEERS
PHILIP M. BOTCH. C ASSOCIATES, INC.
11000 MAIN STREET BELLEVUE, WASHINGTON 98004
January 21, 1983
City of Tukwila
6200 Southcenter Blvd.
Tukwila, WA 98188
Attn: Mr. Brad Collins
Planning Director
Re: Comprehensive Water Plan
File No. EPIC - 198-82
Dear Mr. Collins:
We have been asked by Water District No
proposed Declaration of Non - Significance
Environmental Checklist and Appendixes A,
Comprehensive Water Plan also was a part of
TELEPHONE (206) 682 -5300
EMBHM
JAN 2 41983
C. -OF TUK�WfLA
PLANNING DEPT.
. 125 to comment on your
We have scanned your
B, and C. Figure No. 21,
your submittal.
Service area boundaries of the City of Tukwila have historically been
controversial. Volatile issues have arisen as a result of intrusions
by the City into outlying areas. Several attempts have been made by
the City at annexations to the north and west. Water District Nos.
25, 125, and 75 will be affected if these expansions are successful.
Discussions are underway even now with Water District No. 125 for
boundary adjustments at 53rd Avenue South and South 140th Street, and
near Beacon Coal Mine Road, and South 133rd Street.
Recently, City plans contemplated an annexation of McMicken Heights.
This is adjacent to Water District No. 125 and an impact on both Water
District Nos. 125 and 75 can be anticipated. The current plan
suggests "taking over" certain areas to the east of 51st Avenue South
and South of South 180th Street now served by Water District No. 75.
Since Water District No. 75 has major facilities in these areas, it
does not appear that they will look kindly on proposals made in this
plan.
It would appear that some further attempt should be made to integrate
the water service area with the Comprehensive Zoning Map for the area.
Possibly, an accommodation with the special districts can be made that
will be less disruptive of their planning. Lacking this, it would
appear that a complete EIS might be more appropriate to resolve these
is: =.
Frank Pearson, WD #125
Ray Graeber, WD #75
Document No. 44.38
4mEPRo
„ Municipality of Metropolitan Seattle
Exchange Bldg. • 821 Second Ave., Seattle, Washington
January 18, 19.83
Brad Collins, Planning Director
City of Tukwila
6200 Southcenter Boulevard
Tukwila, Washington 98188
Proposed Declaration of Non - Significance
Comprehensive Sewer Plan, City of Tukwila
Dear Mr. Collins:
JAN 207983
PLANNING EPTA
Metro staff has reviewed this proposal and anticipates no
adverse impacts to its wastewater facilities or the public
transit system.
Thank you for the opportunity to review and comment.
Very truly yours,
Rddney`6. Proctor, Manager
Environmental Planning Division
RGP:lds
4
*ILA
4'1 City of Tukwila
6200 Southcenter Boulevard
p Tukwila Washington 98188
1908
Gary L. VanDusen, Mayor
14 January 1983
NORTON DENNIS ASSOCIATES
6133 6th Ave. So.
Seattle, WA 98108
Attn: Pat Butler
Subject: Environmental Documents, Tukwila Comprehensive Water /Sewer Plans
This morning we received copies of the materials sent out for agency review
as directed in our letter to you of 28 December 1982. We were somewhat
surprised to notice that your office changed the date of signature for the
responsible official on the final declaration form. As a result, the
Declaration which went out to the agencies does not match the original in
our file. We have, therefore, noted in our file that the declarations were
signed on 27 December 1982, but that the date of issuance of the DNS is 11
January 1983, for purposes of compliance with WAC 197 -10 -340. Please make
a similar notation,in your files.
Also, please send us a copy of your cover letter which accompanied transmittal
of the material to the agencies, and a list of the agencies contacted.
Thanks for your assistance.
MC /blk
xc: Planning Director
Senior Engineer
TUKWILA
i
ANNING DEPARTMENT
Mask Caughey
Associate Planner
January 11, 1983
TO ALL INTERESTED PARTIES AND AGENCIES:
The enclosed checklist and proposed declaration of non - significance are
being circulated pursuant to WAC 197 -10- 340(4). All comments and responses
should be received no later than 5:00 P.M., Wednesday, January 26, 1983. Comments
should be sent to the following:
Mr. Brad Collins, Planning Director
CITY OF TUKWILA
6200 Southcenter Boulevard
Tukwila, Washington 98188
Brad Collins, Director of Planning
BC:tlt
•
City of Tukwila.
6200 Southcenter Boulevard
Tukwila Washington 98188
Gary L. VanDusen, Mayor
28 December 1982
Horton Dennis Associates
6133 6th Avenue South
Seattle, Washington 98108
Attn: Pat Butler
SUBJECT: Proposed DNS, Tukwila Comprehensive Water /Sewer Plans
Following extensive review of the Environmental Checklists and supporting
material submitted with the draft texts of the Comprehensive Water Plan
and the Comprehensive Sewer Plan, the Planning Director as responsible
official for the City has approved circulation of a proposed Declaration
of Non - Significance for each according to the procedures outlined in
WAC 19.7 -10- 340(.3).
In accordance with the terms of your company's agreement with the City for
consultant services, please distribute the proposed declarations and
checklists to the various agencies listed below. Each referral should be
accompanied by a cover letter setting forth the inclusive dates of the
fifteen day comment period specified in WAC 197 -10- 340(5), and should
instruct the receiving agency to return comments directly to the Tukwila
Planning Department, attention Brad Collins.
Agency referral for Comprehensive Water Plan:
- King County
-.Water Districts 75, 125
- Cities., of Renton and Kent
- Seattle Water
- Department of Social and Health. Services U ashington State
- Department of Ecology-Wash.i,ngton State
Agency referral for Comprehensive Sewer Plan:
- King County
- Cities of Renton, Kent and Seattle
- Val Vue Sewer District
- Metro-Wastewater Treatment Division
- Department of Ecology-Washington State
- PSCOG, King Subregional Council.
The preceding referral lists represent our best assessment of those agencies
having substantial interest or jurisdiction in the adoption of the subject
Page -2-
Horton Dennis Associ,ls.
28 December 1982
•
Comprehensive. Plans. Please add others to the lists as you think appropriate.
We appreciate your assistance; please call me if y.0 have questions (433- 1849).
xc: Planning Director
Senior Engineer
TUKWIL
ANNING DEPARTMENT
M Caughey
Associate Planner
• •
CITY OF TUKWILA
OFFICE OF COMMUNITY DEVELOPMENT
XXXXXXEDMAE PROPOSED
DECLARATION OF NON - SIGNIFICANCE
Description of proposal Comprehensive Water Plan
Proponent
: City of Tukwila
Location of Proposal
Lead Agency
Tukwila Planning Area
City of Tukwila, WAC 197 -10 -205.
File No. EPIC - 198 -82
This proposal has been determined toXr (/not have) a significant
adverse impact upon 'the environment. An EIS ()5XX /is not) required
under RCW 43:21C.030(2)(c). This decision was made after review
by the lead agency of a completed environmental checklist and other
information on file with the lead agency.
Responsible Official Brad Collins
Position /Title Planning Director
Date 27 December 1982 Signature ekA,k c.te -„,
COMMENTS:
This Declaration of Non - Significance applies only to the legislative act of
adopting the Comprehensive Water Plan. Separate environmental assessment
shall be conducted for any project which implements the Comprehensive Water
Plan.
CITY OF TUKWILA 1
ENVIRONMENTAL CHECKLIST FORM
This questionnaire must be completed and submitted with the application for
permit. This questionnaire must be completed by all persons applying for a
permit from the City of Tukwila, unless it is determined by the Responsible
Official that the permit is exempt or unless the applicant and Responsible
Official previously agree an Environmental Impact Statement needs to be completed.
A fee of $50.00 must accompany the filling of the Environmental Questionnaire
to cover costs of the threshold determination.
I. BACKGROUND
1. Name of Proponent:
2. Address and Phone Number of Proponent: 6200 Southcenter Boulevard
Tukwila, Washington 98188 .(206) 433 -1850
City of Tukwila - Department of Public Works
3. Date Checklist Submitted: 10 -29 -82
4. Agency`Requiring Checklist: City of Tukwila
5. Name of Proposal, if applicable: City of Tukwila - Comprehensive Water Plan
6. Nature and Brief Description of the Proposal (including but not limited
to its size, general design elements, and other factors that will give
an accurate understanding of its scope and nature):
The Comprehensive Water'Plan prepared for the City of Tukwila discusses
the existing land use plan, existing and projected population growth
(See Attached Page A-1)
7. Location of Proposal (describe the physical setting of the proposal, as
well as the extent of the land area affected by any environmental im-
pacts, including any other information needed to give an accurate under-
standing of the environmental setting of the proposal):
The planning area encompasses 6,274.6 acres as identified by the City's
Planning Department. (See Figure 2, attached for exact project boundaries.)
8. Estimated Date for Completion of the Proposal: (See Page A-1)
9. List of all Permits, Licenses or Government Approvals Required for the
Proposal (federal, state and local):
(a) Rezone, conditional use, shoreline permit, etc. YES NO X
(b) King County Hydraulics Permit YES NOS,
(c) Building permit YES N0j
•
(d) Puget Sound Air Pollution Control Permit .YES NO X
(e) Sewer hook up permit YES NO X
(f.) Sign permit . YES NO X
(g) Water hook up permit YES NO X
(h) Storm water system permit YES NO X
(i) Curb cut permit YES NO X
(j) Electrical permit (State of Washington) YES NO X
(k) Plumbing permit (King County) YES NO X
(1) Other: Approval of the Comprehensive Water Plan will be required by the
City of Tukwila and Washington State Department of Social and Health
Services.
10. Do you have any plans for future additions, expansion, or futher activity
related to or connected with this proposal? If yes, explain:
The Comprehensive Water Plan itself is complete, and will be revised
as deemed necessary. However, the size and location of future facilities
will be affected by the plan.
11. .Do you know of any plans by others which may affect the property covered by
your proposal? If yes, explain:
(SEE ATTACHMENT Pages A71 and A-2)
12. Attach any other application form that has been completed regarding the pro-
posal; if none has been completed, but is expected to be filed at some future
date, describe the nature of such application form:
No other application has been filed at this time in conjunction with
the Comprehensive Water Plan. However, for facilities constructed as
a result of. the Plan, SEPA procedures will be followed and the proper
permits applied for.
II. ENVIRONM•IENTAL IMPACTS
(Explanations of all "yes" and "maybe" answers are required)
SEE ATTACHED .PAGES B & C FOR EXPLANATIONS OF "YES" AND
"MAYBE" ANSWERS
1. Earth. Will the proposal result in:
(a) Unstable earth conditions or in changes in geologic
substructures?
(b) Disruptions, displacements, compaction or overcover-
ing of the soil?
(c) Change in topography or ground surface relief fea-
tures?
(d) The destruction, covering or modification of any
unioue (1Pn1nair 'nr nhvcieAi faAtttrac?
YES MAYBE NO
X
X
• •
(e) Any increase in wind or water erosion of soils,
either on or off the site?
(f) Changes in deposition or erosion of beach sands, or
changes in siltation, deposition or erosion which
may modify the channel of a river or stream or the
bed of the ocean or any bay, inlet or lake?
Explanation: 40 b) ' - TEARVW plgZtrin4s Al r(l4rwrpv
PORING GowSTRUGIlo&J of F1.441
l'AVUVAr.01p114,1J IPy eNV4NEN'nS
2. Air. Will the proposal result in:
(a) Air emissions or deterioration of ambient air
quality?
(b) The creation of'objectionable odors?
(c) Alteration of air movement, moisture
or temperature, or any change in climate, either
locally or regionally ?I
YES MAYBE NO
X
X
Explanation: Tp st+otc r -' .M, PAIteWwary veoR,avAilet
WrA172-1sD col% MST' U L GO ",i3 Ono Ni
aeozoiroo -ro e.pgiv.oc5r. f t,11W'b REGbmali oval
)P CV fS.
3. Water. Will the proposal result in:
(a) Changes in currents, or the course or direction
of water movements, in either marine or fresh
waters?
(b) Changes in absorption rates, drainage patterns,
nr the rate and amount of surface water runoff?
(c) Alterations to the course or flow of flood waters?
(d) Change in the amount of surface water in any water
body?
(e) Discharge into surface waters, or in any alteration
of surface water quality, including but not limited
to temperature, dissolved oxygen or turbidity?
(f) Alteration of the direction or rate of flow of
ground waters?
(g) Change in the quantity of ground waters, either
through direct additions or withdrawals, or through
interception of an aquifer by cuts or excavations?
X
X
(h) Deterioration in ground water quality, either
through direct injection, or through the seepage
of leachate, phosphates, detergents, waterborne
virus or bacteria, or other substances into the
ground waters?
(i) Reduction in the amount of water otherwise avail-
able for public water supplies?
Explanation:
4. Flora. Will the proposal result in:
(a) Change in the diversity of species, or numbers
of any species of flora (including trees, shrubs,
grass, crops, microflora and aquatic plants)?
(b) Reduction of the numbers of any unique, rare or
endangered species of flora?
(c) Introduction of new species of flora into an area,
or in a barrier to the normal replenishment of
existing species?
(d) Reduction in acreage of any agricultural crop?
Explanation: G-* ., loo 4t* Varipc saWK 5 .ID pmsToJc
AdfloWsuk PA60gcL4NDS /ka`( 4,44 gwir
-446,11; CoIJV ERSIGJ /D I N"j IJS I V
5. Fauna. Will the proposal result in:
(a). Changes in the diversity of species, or numbers
of any species of fauna (birds, land animals
including reptiles, fish and shellfish, benthic
organisms, insects or microfauna)?
(b) Reduction of the numbers of any unique, rare or
endangered species of fauna?
(c) Introduction of new species of fauna into an
area, or result in a barrier to the migration
or movement of fauna?
(d) Deterioration to existing fish or wildlife
habitat?
Explanation:
YES MAYBE NO
X
4110PM 7 %uc PW I►J sgweK pl a&E,
TU 6I - E- J RIVE+Z MAT reopoc- SEcoioaRf
X
X
X
X
6. Noise. Will the-proposal increase existing noise
levels?
Explanation:
YES MAYBE NO
7. Light and Glare. Will the proposal produce new
light or glare? X
Explanation:
8. Land Use. Will the proposal result in the altera-
tion of the present or planned land use
of an area?
Explanation: promosev c.oMP• eaJP -WA s(sfEM
km7 055.4110N c,OMMUorrl !p'OWTM
ANv p Axx.o 'F - $ f.
9. Natural Resources. Will the proposal result in:
(a) Increase in the rate of use of any natural
resources?
(b) Depletion of any nonrenewable natural
resource?
Explanation:
10. Risk of Upset. Does the proposal involve a risk of an
explosion or the release of hazardous
substances (including, but not limited
to, oil, pesticides, chemicals or radi-
ation) in the event of an accident or
upset conditions?
Explanation:
11. Population.
Explanation:
Will the proposal alter the location,
distribution, density, or growth rate
of the human population of an area?
12. Housing. Will the proposal affect existing housing,
or create a demand for additional housing?
Explanation:
13. Transportation /Circulation. Will the proposal result
(a) Generation of additional vehicular movement?
(b) Effects'on existing parking facilities, or
demand for new parking?
(c) Impact upon existing transportation systems?
(d) Alterations to present patterns of circulation
or movement of people and /or goods?
(e) Alterations to waterborne, rail or air traffic?
(f) Increase in traffic hazards to motor vehicles,
bicyclists or pedestrians?
Explanation:
in:
14. Public Services. Will the proposal have an effect upon,
or result in a need for new or altered .
governmental services in any of the
following areas:
(a) Fire protection?
(b) Police protection?
(c) Schools?
(d) Parks or other recreational facilities?
(e) Maintenance of public facilities, including
roads?
YES MAYBE NO
X
X
X
X
X
X
X
X
x
YES MAYBE NO
(f) Other governmental services? X
Explanation:
15. Energy. Will the proposal result in:
(a) Use of substantial amounts of fuel or energy? X
(b) Demand upon existing sources of energy, or
require the development of new sources of
energy? X _
Explanation:
16. Utilities. Will the proposal result in a need for
new systems, or alterations to the
following utilities:
(a) Power or natural gas?
(b) Communications systems?
(c) Water?
(d) Sewer or septic tanks?
(e) Storm water drainage?
(f) Solid waste and disposal?
Explanation:
17. Human Health. Will the proposal result in the crea-
tion of any health hazard or potential
health hazard (excluding mental health)?
Explanation:
X
X':
X
X
X
X
• •
18. Aesthetics. Will the proposal result in the obstruc-
tion of any scenic vista or view open to
the public, or will the proposal result
in the creation of an aesthetically of-
fensive site open to public view?
Explanation:
19. Recreation. Will the proposal result in an impact
upon the quality or quantity of exist-
ing recreational opportunities?
Explanation:
20. Archeological /Histroical. Will the proposal result in
an alteration of a signifi-
cant archeological or his -.
torical site, structure,
object or building?
Explanation:
YES MAYBE NO
CERTIFICATION BY APPLICANT:
I, the undersigned, state that to the best of my knowledge the above
information is true and complete. It is understood that the lead agency
may withdraw any declaration of non- significance that it might issue in
reliance upon this checklist should there be any willful misrepresentation
or willful lack of full disclosure on my part.
- 5?ivi or\,
1C)/()/ a�
Signature and Title Date
X
X
0_ ATTACHMENT - PAGE A -1
Checklist Section I- -Item 6
within the existing service and planning areas, water useage and
design criteria, the existing system, and water system expansion
and improvements. Proposed water system facilities affect the
supply, storage and distribution aspects of the system.
The Comprehensive Water Plan addresses the territory within the
City's Planning Area. It also focuses on those portions or areas
presently being served by the City of Tukwila and in the City's
Planning Area. System improvements would be provided as dictated
by the demand for such facilities. In most cases, distribution
improvements would be financed by developers, and major improvements,
such as wells, reservoirs and transmission mains would be funded
through bonds as City initiated.
• Checklist Section I- -Item 8
The Comprehensive Water Plan, which is a non - project action,
will be completed in 1982. At this time, no dates have been deter-
mined for the start or completion of the actual design or construction
of facilities which will proceed as a result of the plan.
Checklist Section I- -Item 11
Relationship to Basin -Wide Water Plan
The existing and proposed water system for the City of Tukwila is
dependent upon the City of Seattle Water System and their projected
plans, as stated in the City's adopted Comprehensive Plan (March 1980).
The Seattle Comprehensive Plan provides for the continuation of an ade-
quate and reliable supply of high - quality drinking water for the Seattle
metropolitan area. This plan will be updated and re- evaluated at least
once every five years. Tukwila's plan is developed under the premise
that Seattle will continue its role as regional water supplier for the
metropolitan. area.
Relationship to Adjacent Cities and King County Plans
This plan is consistent with the plans and service areas of the City of
Kent and City of Renton. The service boundary on Tukwila's east side
coincides with these municipalities. An overlap of service areas exists .
in the south end of Tukwila to the area of the Segale Development. With
the completion of a proposed reservoir near this area, the City will be
better able to serve the area than Water District No. 75 and expand their
water system south to include the area between the Green River on the east,
I -5 on the west and City of Kent city limits on the south. This expansion
should occur as properties request and receive annexation to the City. The
City and Water District No. 75 should meet to coordinate improvements in
this area and ensure an orderly development and upgrading of the system.
Water District No. 75 shows a water improvement in this area to I -5, heavy
development can expect to occur. This plan and King County Water District
No. 75's Comprehensive Plan are compatible along the west side of the City.
Highline water district intertie
Water district 75 intertie
Water district #75 intertie
Attachment
Page A -2
In that the City does not have adequate facilities west of I -5, it is
possible Water District No. 75 must continue servicing that area even
though small areas are inside the City of Tukwila. Although there
have been past attempts to annex portions of McMicken Heights to the
City of Tukwila, annexation of the water system is not comtemplated.
City of Seattle /Water Purveyor Contract
For years the City of Seattle has been working in an attempt to sign a
City of Seattle /Water Purveyor Contract. The purpose of this agreement
is to establish in writing an agreement guaranteeing the purchase of water
from Seattle to aid in planning and financing needed system expansions and
improvements and also guarantee the purveyor a continued source of water.
The contract includes guidelines which govern existing and future relations
between the City of Seattle and the wholesale purveyors. Negotiations with
the City have resulted in two versions of the contract whereby one must be
signed by March 1, 1982 to guarantee the future availability of water on a
priority basis.
Service Area and Intertie Agreements
Tukwila has interties and intertie agreements with the City of Renton, City
of Kent, Water District No. 125 and Water District No. 75. The need for
additional interties is not foreseen at this time. Water District No. 125's
comprehensive water plan indicated a future intertie with Tukwila and the
City would cooperate if this intertie is requested. The intertie with Water
District No. 75 may need to be relocated if the City takes over service to
the Segale Manufacturing Park. An agreement between Water District No. 75
and the City has been recommended for future service to the adjacent area.
Annexation /Development Projects
The proposed Comprehensive Water Plan will serve the projected population
of Tukwila's Water Service Area. (See drawing attached to this checklist).
However, it is not anticipated that this proposal will encourage growth
but will rather, react to it. The Comprehensive Water Plan will regulate
efficient extension of the system but is not intended as a growth inducing
project.
• •
ATTACHMENT - PAGE B
Explanation of "Yes" and "Maybe" Answers
3. Water
(d) Due to the possible increase in water demand, the present source,
the Cedar River, may be slightly altered in volume and surface area
(e) Higher water consumption would indirectly lead to increased flow
to storm drains which discharge to the Duwamish River.
(f) & (g) Drilling wells in the valley may alter the flow and quantity
of ground water.
(i) Increased water consumption would result in a greater water volume
withdrawal from the Cedar River watershed, and thus possibly reduce
the available water for other areas.
6 Noise
Well pumps will be designed for low noise level. However, local noise
levels may experience a slight increase in the immediate vicinities
where pumps are situated.
8. Land Use
Implementation of improvements proposed in the Comprehensive Water Plan
could facilitate additional development of portions of the planning area
presently within King County,provided portions or all of the area are
eventually annexed to the City of Tukwila.
The proposed plan may permit the possible assumption of portions or all of
the King County Water District No. 75 system lying within the City of
Tukwila, and the take over of the Independent Water System within Tukwila's
boundaries as well as the take over of a small area located within the
City of Renton. All of these actions could have indirect impacts
on land use which would be addressed at the time a project is initiated.
9. Natural Resources
(a) The possibility of an increase in development and population within
the City would result in an increased rate of deaand upon supply.
T
11. Population
Comprehensive Plan Recommendations are for both existing and proposed
development. Maintenance improvements to the existing system probably
ATTACHMENT - PAGE C
11. Population Cont.
will not affect population growth. However, large capital improvements
will either follow a growing need or facilitate growth as an offshoot.
In either case, this would result in an increase in the area's population
with the consequent secondary impacts that follow. i.e., increased
demands for housing, pulic services and additional load on the area
roadways. Population increases, however, are subject to a number of
variables, utility actions being only one of them.
12. Housing 13. Transportation /Circulation 14. Public Services
Please see discussion above.
15. Energy
(b) Proposed wells will require electricalipower for operation.
16. Utilities
(b through f) Flow control system will require use of existing
telephone or radio communications. An increase in water demand will
cause the need for increased water facilities. Increased discharge
to the sewer and storm drainage systems.will result in the need to
assess the adequacy of the existing facilities of these utilities.
Indirectly, the quantity of solid waste and disposal thereof will be
affected to the increase in population and development.
APPENDIX A
CITY. OF' TUKWILA
COMPREHENSIVE WATER PLAN
SUMMARY AND DISCUSSION OF ASSUMPTIONS'
Purpose
This summary provides an overview of the detailed study conducted for the Tukwila
Water System, and discusses the assumptions under which that study proceeded. The
Comprehensive Water Plan studied the existing system for adequacy of water supply,
storage, pressure, and capacity of the distribution system. It also projected
growth for the system and suggests necessary improvements to handle anticipated
future demand. The complete document is on file at the City's Public Works Dept.
Assumptions
I) Study Area
The study included a discussion and analysis of the Tukwila Water System both
within and outside the City Limits, including interties with four adjacent
districts. The study area included approximately 9.8 square miles. Chapter III
of the Comprehensive Plan includes maps showing physical features, geology, soils,
surface and ground water characteristics as well as planning, zoning, population
and growth projection scenarios for the area.;
II) Growth Projections
The three scenarios described below establish the base conditions for assessing the
adequacy of the existing water system given the most likely ways in which the city
will develop through 1990. Resident and employee population levels are projected for
each scenario, as are land use statistics for both residential and non - residential
activity. These data may be found in detail in Chapter III of the Plan text.
Scenario 1 - Existing Conditions
This is based on. 1980 housing and employment figures.
This scenario established the development conditions
and population.
Scenario 2 - Vacant Land Built -Out
This scenario is developed according to the 1982
zoning ordinance by filling the vacant land to a total
build -out condition.
Scenario 3 - Redevelopment Build -Out
This scenario assumes that portions of the planning
area will redevelop to high intensity land uses and
all vacant land will develop and infill in a higher
intensity use.
It should be noted that the intent of the plan under each of the scenarios de-
scribed above . is to readt to growth pressures within the community
and not necessarily to encourage or direct growth.
III) Design Criteria
The Washington State Department of Social and Health Services specifies minimum
water system design and service requirements which are fully set -forth in Chapter
V of the Plan text. These criteria include the following,'
Planning Considerations
Reliability Considerations
. Distribution System Design (including 30 psi minimum water pressure)
Water Storage and Daily Supply Requirements
Recommended average daily water consumption for Tukwila for various types of
uses were calculated based on available water use data. From these figures,
design peaking factors were developed and used in the "Hydra" computer model
to size the critical transmission and distribution mains based on ultimate
• •
fire flow requirements for Scenario III - Redevelopment Build -Out. An
average annual increase in Tukwila's water use of 3.4 percent was used to
estimate Tukwila's future water use and storage requirements. Storage re-
quirements include allowance for standby, equilization and fire storage
components. Appendix M of the Comprehensive Water Plan includes a list
of. Tukwila's approved list of water system equipment and materials.
Summary System Analysis and Proposed Improvements
This study determined that the existing water system has adequate water supply,
pressure in most locations, and capacity in most locations. The system is pre-
sently deficient in: storage (Tukwila has no storage facilities); pressure at
higher elevations of North Hill; and is deficient in capacity in several lo-
cations due to small water mains. To correct these inadequacies, storage
facilities (10 million gallons [MG] at two sites), new water transmission lines,
larger water mains, and one pump station are recommended.
In order to minimize the cost for new water supplied to Tukwila by Seattle in
the future, it is recommended that two water wells be drilled (one in 1983 and
one in 1990+) near the Green River within Tukwila to supply most of Tukwila's
new water needs over the next 25 years. The preliminary cost for a ground water
site feasibility study totals $4,500. This study will confirm the existence of
adequate ground water source and ground water quality. If this study confirms
that ground water is available, it is recommended that one 350 GPM municipal
water well be installed as part of Phase I (see below) at a total cost of
$168,000. Estimated annual savings for this well is projected to be $17,500
(1982 dollars) increasing to $123,000 (1992 dollars) based on the projected in-
crease in the price for "New" Seattle water.
The estimated cost for the Phase I recommended improvements totals $2,834,750.
and includes the following items:
CITY OF TUKWILA
PHASE I - WATER SYSTEM IMPROVEMENTS
COST ESTIMATE
Estimated Cost in
Item No. Description 1982 Dollars
1 5 MG Storage Reservoir on West Hill $ 1,762,000.
2 14" and 20" Main from new reservoir to valley 430,000.
3 12" Main from North Hill to Southcenter
Area $ 308,000.
5 One Well 168,000.
8 Telemetering Controls on Seattle Taps 166,750.
TOTAL ESTIMATED COSTS: $ 2,884,750.
These Phase I improvements will satisfy 90 percent of Tukwila's immediate storage
needs as listed. In addition, a two (2) MG Storage tank is required in 1985 for
North Hill and another three (3) MG in 1997 at the West Hill Site._ The initial
5 MG storage facility will eliminate Seattle's Peak Demand Charge which totaled
$36,000 in 1982 and would be expected to increase 5 to 10 percent per year without
storage facilities.
The Phase I transmission main and distribution improvements will satisfy about
17 percent of the improvements shown on the Comprehensive Water Plan (see attach-
ed Comprehensive Plan Map). The remaining distribution system improvements will
be completed over a 20 year period as required as part of developer extensions
and overall system improvements.
Implementation
VarioLs funding alternatives to cover the Phase I costs are discussed in detail
in Chapter VII of the Comprehensive Water Plan. All of the needed water system
• improvements are eligible for a Washington State DSHS Referendum 38 Construction
Grant covering 40 percent of the eligible construction costs. A three year -six
percent loan is available to cover engineering costs associated with the improve
ments. It is recommended that a General Facilities Charge be imposed on all new
buildings for development and property that redevelops. In addition, an increase
in water rates is recommended which will help to pay for Phase I improvements.
APPENDIX 13
, CITY OF TUKWILA
COMPREHENSIVE WATER PLAN
ALTERNATIVES AND RECOMMENDATIONS
Purpose
The existing system and its potential improvements involve analysis of water
sources, water storage, distribution and transmission mains, the interrelation-
ship with neighboring water service jurisdictions including consideration of
annexation or adjustment of services boundaries inclusive or exclusive of their
utility systems. The following discussion examines those elements:
WATER SOURCE' IMPROVEMENTS
Alternative 1: Seattle Water Utility
The Seattle supply system is presently adequate for Tukwila's water needs.
However, present annual peak demand charges and possible future "new water
use" charges force consideration of developing other water source in the
area.
Alternative 2: Direct Extraction from the Green River
The Green river is the only substantial source of surface water present in
the study area. Since considerable treatment would be required to upgrade
water taken directly from the river to state - established drinking water stan-
dards, the Green River is not considered a feasible alternative water source.
Alternative 3: Groundwater Extraction
As detailed in a groundwater study completed as part of the Comp Plan the
groundwater in the study area provides the potential to meet the water - supply
needs of Tukwila. The southern portion of Tukwila, within the Green River
• •
Alluvial Aquifer, contains an estimated moderate to high water yield potential
for a groundwater supply. Since little is known about the quality of water in
this aquifer, . it is recommended that an exploratory test well be installed in
order to test the water quality and yield of this aquifer. Assuming that the
groundwater is suitable in both quality and quantity, two water wells are pro-
posed at an estimated cost of $300,000. in two phases. Provided the City signs_
a long term water supply contract with. Seattle, Seattle's permission would be
needed before well water could be developed and used as part of Tukwila's water
supply.
WATER STORAGE IMPROVEMENTS
Alternative 1: No Storage
One alternative is to operate the water system AS Is" with no storage facili-
ties. In view of the DSHS requirements for reliability, the Tukwila system is
considered deficient since it is primarily dependent on two Seattle supply lines.
Interties with other water systems are valuable when local--'roblems occur,
but would be of little use if one of the Seattle mains is shutdown. Such a
situation will occur during the winter months, 1982 -1983 when the 48 inch West
Seattle Supply Line serving North Tukwila will be shutdown for several months
for maintenance work. As discussed in Chapter VI of the Comp Water Plan,
without adequate storage and flow control valves, the monthly Seattle peak
demand charge is estimated to increase from five to ten percent annually. Based
on.this, the estimated demand charge the City will pay over 20 years if no storage
is provided, is $1,225,000 +.
Alternative 2: Cooperative Storage Facility with Water District 75
Although officials from Water District No. 75 have expressed some interest in a
cooperative storage facility in the vicinity of the District's existing Bow
Lake Reservoir, their 1982 Comprehensive Water Plan indicates future storage
facilities at their Mansion Hill storage site, located two miles south of the
Bow Lake site, where the District presently owns a reservoir site. A coopera-
tive reservoir would have to be located at about elevation 550 feet to serve
District No. 75 customers. Such a high elevation would require pumping water
from the Seattle system into the reservoir, and would require the use of a
pressure- reducing valve (PRV) to serve the Tukwila system. This alternative is
not considered feasible since the costs and reliability associated with pumping
and use of a large PRV would negate the advantages of a cooperative facility.
In addition, the City of Seattle has indicated they would not be capable of
supplying the amount of water Tukwila needs at that location without major modifi-I
cations. I
Alternative 3: Cooperative Storage Facility with Other Districts
Water District No. 125 has recently purchased a large storage interest in a
cooperative reservoir with Water District No. 20. District No. 125.is there-
fore not interested in additional storage capacity in the near future.
Due to long distances-, e ation factors, and lower press systems, no
cooperative storage facilities were considered with the Cities of Kent or
Renton. The pressures in these water systems are too low to serve the
Tukwila system under normal operating conditions.
Alternative 4: Storage Facilities on West Hill and North Hill
This alternative includes reservoir sites on West Hill west of I -5 and on
North Hill north of I -405. No pumping or PRV facilities would be required
for the West Hill site since the reservoir would be located at elevation 330 +
(overflow elevation 360 +) so as to match the existing pressure zone in the Tukwila
water system. This reservoir would be filled and serve Tukwila through a common
new 20 inch transmission main utilizing the existing Seattle system meters and
Tukwila transmission system located in the valley. Phase I (1982) would include
one five million gallon (5 MG) reservoir plus transmission mains. Phase III
(1997) would add 3 MG of storage to the initial 5 MG for a total of 8 MG at the
West Hill site.
This alternative would also include 2 MG of storage as part of Phase II (1985)
to be located near the top of North Hill in North Tukwila. This facility would
be installed at elevation 200 feet +, and a pumping plant (Phase II) would be
used to maintain the system's hydraulic gradient at 3G0 feet +. Again, no PRV's
would be necessary since all facilities would be located to maintain one pressure
zone at 145 psi. This reservoir would be filled and serve the City through a
common new (Phase I) 12 -inch transmission main connecting North Hill with the
Southcenter Area.
Installation of storage as previously discussed could eliminate the demand charge
and also save on insurance costs as insurance rates are based partially on system
reliability..
DISTRIBUTION ANI1.TRANSMISSION MAINS
The Comprehensive Plan (drawing attached with this checklist) includes many new
I
In addition, each project
and upsized water distribution and transmission mains.
is listed within one of the overall Comprehensive Plan Construction Schedules.
The proposed pipeline improvements were sized to meet or exceed the minimum pipe-
line size standards as presented in the chapter on design criteria. For critical
water mains:the "HYDRA" hydraulic computer model was used to size the mains to
insure adequate main capacity for peak flow conditions, based on Scenario III,
described inAppendix A.
SERVICE AREA BOUNDARY ADJUSTMENTS
As part of this water plan, it is suggested that Tukwila take over that portion
of the water system within the Tukwila City Limits south of South 180th Street
presently served by Water District No. 75. The close proximity of this area. to
proposed water storage and transmission Facilities on West Hill would insure an
adequate water supply to the Segale Business Park and other locations further
south on the west side of the Green River. The extent of this service area
expansion might extend south of the Tukwila City Limits. The exact new service
boundaries would be established following negotiations with Water District No. 75.
Recommendations
•
As a result of this study, the following recommendations and conclusions are
made as part of the City of Tukwila's Comprehensive Water Plan:
1. It is recommended that Tukwila adopt this plan utilizing the existing
single pressure zone concept.
2. It is recommended that Tukwila immediately proceed with the ground
water reconnaissance study to define the quantity and quality of
available ground water in the Tukwila Area.
3. It is recommended that Tukwila immediately locate and purchase the
necessary land and easements required for the storage and transmission
main improvements as recommended in this Plan.
4. It is recommended that the City apply for a DSHS Referendum 38 Grant
to cover 40 percent of the eligible construction costs of the Phase I
improvements. If required, a three year -six percent loan is available
to cover associated engineering costs.
5. It is recommended that Tukwila proceed with the necessary engineering
studies and design required to complete the Phase I improvements as
soon as possible.
6. It is recommended that Tukwila increase monthly water rates for all
water customers and impose a General Facility Charge on all new build-
ings for development and property that redevelops.
Residential
5/8 or 3/4 inch
PROPOSED WATER RATES
• Base Rate
4.00 /month. +60¢/100 cu.ft.
Commercial
1 inch
1 -1/2 inches
2 inches
3 inches
4 inches
6 inches
8 inches
$ 10.00
$ 22.50
$ 40.00
$ 90.00
$ 160.00
$ 360.00
$ 640.00
+60¢/100 cu.ft.
+60t /100 cu.ft.
+60t /100 cu.ft.
+60t /100 cu.ft.
+60¢/100 cu.ft.
+60t /100 cu.ft.
+60t /100 cu.ft.
These increases would constitute an average of 27 percent increase in residen-
tial .water rates and from 80 percent to 250 percent increase in commercial /in-
dustrial water rates. These proposed water rates are summarized in Chapter VIII
of the Comprehensive Water Plan.
PROPOSED GENERAL FACILITIES CHARGE
Commercial /Industrial Buildings
25t per gross square foot
Residential
$400 per residence
$300 per multi -unit
7. In order to avoid a Public Works emergency and to maintain sufficient fire
flow capability in the north part of Tukwila, it is recommended that Tukwila
require the City of Seattle Water Department to maintain a minimum 2,000
gallon per minute (GPM) capacity capability at 150 psi at the Allentown 10
inch PRV station during the proposed 1983 -84 maintenance shutdown of the
48 inch West Seattle Supply Line..
8. With construction of the Phase I improvements on West Hill including a 5.0
MG reservoir, Tukwila's natural water services area would extend south to
include Segale Business Park and part of unincorporated King County. In
order to provide lireased water service, increase• ty revenues, and pro-
vide additional control over a large service area close to Tukwila's fa-
cilities, it is recommended that Tukwila coordinate with Water District
No. 75 in taking over water service in the area from I -5 on the west to
the Green River on the east (including Segale Business Park) and from
South 180th Street on the north to South 204th Street on the south. This
area includes areas within Tukwila as well as Unincorporated King County
presently served by Water District No. 75. Development within the expanded
service area would then fall under this plan and be subject to the water
rates, general facilities charge and design and construction standards set
forth herein.
9. In order to protect the safety, health and welfare of the people working
and living in the area, it is recommended that Tukwila negotiate a take
over of the Independent Water Company's water system when the present
owners request. The present system is not well "maintained and the pressure
reducing valve (PRV) vault is in need of an overhaul. Because of the need-
ed improvements to the system, the system has little value and is a liabil-
ity to the present owner. The takeover of this system would insure that
future water system developments in that part of Tukwila would be designed
and constructed under this Plan as administered by the City.
Based on development Scenario II (Vacant Land Build -Out), commercial build-
ings totaling over 500,000 gross square feet are anticipated by 1995 within
this service area. The projected revenue from the proposed facilities
charge above would total approximately $125,000. In addition, the developers
would be required to install larger water mains per the enclosed Comprehen-
sive Plan Map. These improvements would reduce the future costs for up-
grading the Independent System.
10 It is recommended that the Public Works Department review the Tukwila
Water System and Comprehensive Water Plan before any building larger
than 100,000 square feet is approved by the Tukwila Building Department.
11. This study determined that the Tukwila Water Department has sufficient
staff to properly operate and maintain the existing water system. With
the future additional storage wells, flow control, pump station and
expansion of the system to the south, additional maintenance personnel
may be needed.
Critical components of the Water Departments' Ongoing Preventive Main-
tenance Program include the following tasks which should not be curtailed
because of increased meter installations:
Cross Connection Program
Annual Hydrant Checks
Annual Valve Checks
Water Meter Testing
PRV Maintenance
Flow Tests
If operation and maintenance of the Tukwila water system requires more
manpower than is currently available, it is recommended that water meter
installations be subcontracted out to approved companies bonded to the
City. Water meter installations would be paid for by the developer but
would be controlled and administered by the City. If necessary, some
valve and hydrant checks could also be hired out as meter reading is
currently handled.
12. It is recommended that the City sell or trade the old 6 inch steel water
main located outside the City Limits near the Beacon Coal Mine Road. The
resolution of this problem water main will save the Water Department valu-
able time and expillle better used elsewhere. The Sy is presently
negotiating with Water District No.'125 to trade this line for a
different service area in North Tukwila.
13. It is recommended that a uniform developer extension standard and
policy manual be written to administer and control extensions on
all new system extensions and improvements.
14. In order to minimize peak demand charges by the City of Seattle, it
is recommended that Tukwila pass an ordinance restricting all landscape
and lawn sprinkling to the evening hours (6 P.M. to 6 A.M.) until
Reservoir Nu. 1 is in operation.
15. It is recommended for any new large industrial water users, the City
requires the developer to consider and incorporate if possible, flow
reduction ideas such as recirculation and utilizing alternative sources
of water.
APPENDIX K
PROPOSED WATER SYSTEM IMPROVEMENTS
PROJECT CONSTRUCTION SCHEDULE
YEAR 1982
Project Pipe Approximate Location Project
Number Length Dia. On From To Cost ($) Comments
1 - -- West Hill Reservoir No. 1 1,762,000 5.0 MG
2A 5,000' 20" West Hill Reservoir No. 1 S. 180th & Southcenter Pkwy 360,000
2B 1,400' 14" S. 180th Southcenter Pkwy Andover Park West 70,000
5,300 12" Southecenter Pkwy South 180th Street Strander Boulevard 233,200
3 7,000' 12" North Hill
(Total)
Reservoir Site 2
Southcenter Area 308,000
1,300' 12" Southcenter Pkwy S. 164th St. Southcenter Entrance
3 —< 1,800' 12" Tukwila Pkwy Near 12" PRV 400' West of Andover Park W.
(Item-
ized) 600' 12" Bridge Tukwila Pkwy Southcenter Blvd.
3,300' 12" Southcenter Blvd. I -405 Reservoir No. 2
& 57th Ave. S.
5
6
North Hill at 200,000 Pump Static
Reservoir No. 2
Near Green River 168,000 Water Well
at Minkler Blvd.
North Hill Reservoir No. 2
Near Green River
at S. 180th
800,000 2.0 MG
150,000 Water Well
At Seattle Taps 166,750
Four (4) cc
trol valve!
with contr.(
telemetry
APPENDIX K
PROPOSED WATER SYSTEM IMPROVEMENTS
PROJECT CONSTRUCTION SCHEDULE
YEAR 1982
Project Pipe Approximate Location Project
Number Length Dia. On From To Cost ($) Comments
9 Beacon Hill Beacon Coal Mine Rd. South 133rd Being nego-
tiated wit
W.D. #125
10 2,200' 12" West Valley South 142nd South 147th 100,000
Highway
•
Maule St.
11 300' 12" South 140th West Valley Highway Going East 15,000
12 Pamila Drive W.D. #125
near 57th Ave. Cost
S. (Pressure
and flow de-
ficiencies)
13
14
•
West Hill
(Pressure
and flow de-
ficiencies)
West Valley
Highway system
deficiencies
51st South
I -405
53rd Avenue South
South
W.D. #75
Cost
130,000 Independent
Water Co.
Cost
APPENDIX K
PROPOSED WATER SYSTEM IMPROVEMENTS
PROJECT CONSTRUCTION SCHEDULE
AFTER THE YEAR 1985
Project Pipe Approximate Location Project
Number Length Dia. On From To Cost ($) Comments
15 West Additional Capacity for Reservoir No. 1 1,000,000 3.0 MG
16 5,700' 14" Southcenter South 180th Street, South 190th Street 305,000 Includes
Parkway 12" PRV
Complete
170 850' 12" Private Road Southcenter Parkway Running East 37,500
North of South
180th Street
18 1,050' 12" Near South 46,000
180th Street
and Southcenter
Parkway
19 1,950' 12" Minkler Blvd. Southcenter Parkway Andover Park West 86,000
20 1,950' 12" Future Street Southcenter Parkway Andover Park West 86,000
21 2,000' 12" Strander Blvd. Southcenter Parkway Andover Park West 88,000
22 3,800' 10" Strander Blvd. Andover Park West Near Green River 137,000
23, 900' 10" Andover Park Strander Boulevard Baker Boulevard 32,500
West
24 1,100' 10" Baker Blvd. Andover Park West Andover Park East 40,000
25 1,200' 10" Andover Park Baker Boulevard Tukwila Parkway 43,000
West
26 1,400' 10" Tukwila Prkwy 400 feet west of Andover Park East 50,000
Andover Park West
Project Pipe
APPENDIX K
PROPROSED WATER SYSTEM IMPROVEMENTS
PROJECT CONSTRUCTION SCHEDULE
AFTER THE YEAR 1985
Approximate Location
Number Length Dia. On
27 300' 12" Tukwila Prkwy
28 900' 12" 68th Ave. So.
290 700' 10" 68th Ave. So.
30 600' 12" 68th Ave. So.
31 700' 10" P & U.P. R.R.
32 1,300' 12" P & U.P. R.R.
33 3,200' 8" West Valley
Highway
34 600' 10" West Valley
Highway
35 12,000' 12" East of West
Valley Hwy.
1,450' 12" Interurban
Avenue
37 950' 8" South 153rd St.
38 450' 8" South 152nd St.
39 800' 12"
40 250' 10"
41 900' 8"
58th Ave. S
58th Ave. So.
65th Ave. So.
Project
From To Cost ($) Comments
Andover Park East 68th Avenue South 13,000
Tukwila Parkway South 900' 40,000
400' North of Baker 300' of Baker 25,000
Strander Boulevard 600' North 27,000
West Valley Highway C.M. Street P. R.R. 57,000
C.M. Street P. R.R. Strander Boulevard 25,000
600' North of Minkler 1000' north of Strander Blvd. 93,000
Minkler Boulevard
Minkler Boulevard
South side of I -405
65th Avenue South
600' north 22,000
600' south of Strander Blvd. 530,000
Southcenter Boulevard 64,000
East to Southcenter Blvd. 27,500
450' east of 57th. 900' east of 57th Avenue South 13,000
Avenue South
Reservoir No. 2
Reservoir No. 2
South 151st Street
South 152nd Street
North 250'
South 149th Street
35,000
9,000
26,000
Project Pipe
Number Length Dia
APPENDIX K
PROPOSED WATER SYSTEM IMPROVEMENTS
PROJECT CONSTRUCTION SCHEDULE
AFTER THE YEAR 1985
Approximate Location
42
43
44
45•
46
47
48
49
50
51
52
5•
54
55
56
57
58 2,700' 12" East of West
Valley Highway
On From
600' 8" 62nd Ave. So. South 149th Street
450' 10 ". South 147th St. F.H.
350' 8" South 147th St. 62nd Avenue South
650' 8" South 147th St. 59th Avenue South
200' 8" South 147th St. 58th Avenue South
900' 8" Easement South 147th Street
350' 8" 144th Street 59th Avenue South 350'
500' , 6" 59th P1. South. South 144th Street
500' 6" Easement South 149th Street
700' 8" Easement 53rd Avenue South
400' 6" South 147th St. 55th Avenue South
950' 6" 55th Ave. So. South 147th Street
800' 6" 54th Ave. So. South 144th Street
450' 6" South 141st St. 55th Avenue South
550' 6" South 142nd St. 53rd Avenue South
1,770' 6" South 134th St. East of 42nd Avenue South
North of 48th Avenue South
To
South 147th
Interruban
F.H.
62nd Avenue
59th Avenue
South 144th
East of 59th
59th Avenue
Street
South
South
Street
South
South 147th Street
55th Avenue South
56th Avenue South
South 144th Street
South 142nd Street
56th Avenue South
55th Avenue South
Project
Cost ($) Comments
17,500
1.6,000
10,000
19,000
6,000
26,000
10,000
12,000
12,000
20,000
10,000
23,000
19,000
11,000
13,000
41 ,000
119,000
THRESHOLD DETERMINATION
Comprehenisve Water Plan (EPIC- 198 -82)
Proposed Action
The City of Tukwila Public Works Department, has prepared an environmental
checklist for a program proposal constituting a comprehensive water plan.
The plan's purpose is to describe and recommend improvements to the domestic
water utility system which will enable it to keep pace with expected
patterns of residential and industrial growth in the community through 1987
and annual updates thereafter. City Council adoption by formal motion is
required to put the plan into effect, with approval of the State D.S.H.S.
Checklist Review
Since the Comprehensive Water Plan is a programmatic document, the environmental
checklist does not analyze specific project actions recommended in the plan.
Rather, the checklist summarizes the topical content of the plan and assesses
the impacts of broad alternatives. The checklist also describes the
technical and growth management policy assumptions under which the plan was
prepared. The Checklist makes extensive reference to the full comprehensive
water plan text at several points; this procedure is considered generally
acceptable under SEPA administrative practice when discussing a non - project
action proposal.
- Checklist Section I. - Item 11 (Relationship to `Oth.er .PThan Documents)
The discussion is generally adequate in its disclosure of consistency with
planning efforts already on record by adjacent water service jurisdictions.
The key insights here are that Seattle is expected to continue its
present role of regional water supplier and that the plan does not
program system improvements beyond the City utility's present service
area boundary. No• direct link between potential annexations to the
City and adjustment of water service boundaries is expected. However,
this conclusion should not suggest that the Comprehensive Water Plan is
unresponsive to the City's Comprehensive Land Use Plan Policy advocating
active expansion of city boundaries into the planning area. As the
expanded response to Checklist Section II, Item 8 (Land Use) indicates,
water plan improvements will allow the capability of expanding into other
service areas should annexation of such lands take place.
- Checklist Section II.- Item 11 (Population)
The response here begs the key question. of growth management impacts of
the plan by stating that related capital improvements either will follow
growth or produce growth demand pressures as a secondary impact. However,
the expanded checklist discussion of "assumptions" indicates that the
intent of the plan is not to foster expansion of population levels or
redirect geographic distribution thereof within the community. While
the proposed capital improvement roster attached to the checklist priori-
tizes improvements at the urban fringe, plan data indicates that they
are intended to upgrade existing system inadequacies. In any case, it is
reasonable to require that growth related impacts of a primary or
secondary nature can and should be assessed on a quantitative basis
during subsequent environmental review of those capital projects.
Page -2-
THRESHOLD DETERMINATION
Comprehensive Water Plan (EPIC- 198 -82)
- Checklist Section II - Item 16 (Utilities)
The answer to this item contained on Page C of the attachment is hardly
convincing, yet it does present a brief but cogent agenda for an
expanded discussion of the cumulative impact of the Comprehensive. Water
Plan upon the .total. uti;l.lty system.. The water plan is being
prepared and submitted for Council approval concurrently with the
Comprehensive Sewer Plan. Unfortunately, neither plan makes extensive
cross reference: to the other. '_..ThereforeE.the
assessment of infrastructure inter - system impacts becomes more urgent.
A qualitative judgment of the impacts of the improved water distribution
system on the City's sewer network in particular should be undertaken.
Expanded Checklist (Appendix B)
An important aspect of environmental analysis for program proposals which
is not easily documented in the traditional checklist format is the descrip-
tion of alternative actions which are available to accomplish the objectives
of the proposal. However„ ,the- expanded checklist has included a.narrative
description of the alternative and recommended actions proposed to implement
the Comprehensive Water Plan. Alternative system improvements are classified
under three principal headings:
1) Water Source Improvements
2) Water Storage Strategies
3) Service Boundary Adjustments
.:Within each group of action alternatives is a recommended option which has
been judged as the most appropriate means of implementing that aspect of the
plan. The topical impacts of each alternative have been studied in Matrix One;
impact intensity has been judged qualitatively in relation to the no- action
alternative:
In each instance, it appears that any alternative to the status -quo will entail
slight adverse environment implications; however, the corresponding improvement
in overall operating efficiency of the water utility, coupled with carefully
devised mitigation strategies to be developed in the environmental documents
prepared for each specific construction project, should minimize adverse
impacts anticipated by the Comprehensive Water Plan.
MATRIX
v)
(3)
E
0)
0
a
E
ONE
ENVIRONMENTAL ELEMENTS
S_
Q)
N 4-)
Q) 0
0 RS
S- C S_
= O r0
0 •r _s=
Q) V - +) >> U
S.. Q) S_ C M N C
M CC rC 0 +-) V) 0 0 0 V)
Q •r •■ r U 4-)
Cr rO r rN 6 4r 0, (5, $ 'GI •r- 4-) +-) O •r •r-
• 2 MS 2 tC C Q U >> 4-) .0 Q) t0 (1) E C
S_ r0 (t Q) 4-) S- —. r •r- N •r- r +-) L (1) M 0 0
-6-) Q) S_ C N t -0 = Y = N C > S_ r r +-) 5- ..0 c E
i S_ 4-.) 0 O •■ 0) C +) (i) CL O r0 5- (1) •r r6 N U U O E
MS •r MS r M0 0 •r MS CO •r 0 0 S- Q) C is Q) Q) 0) S- U O
I W Q 3 V-- U. Z J J Z CC a. 2 1— t/) W 2 = Q C4 Q W U
Seattle Water (No Action)
Green River.
- - -
Ground Water
(Recommended)
_ +
No Action
Coop. W /Dist. 75
- + - - - + - - - + +
Coop. W /Other Districts
- + - - - + - - - - +
Nest Hill/North Hill
(Recommended)
- - - - + - + - - - + +
No Action
Take Over South of
S. 180th (Recommended)
+ + - - + +
- - Indicates impact may be more intensive than that of no action alternat
= Indicates impact may be similar to that of no action alternative
+ Indicates impact may be less intensive than that of no action alternat
z . (A./ 7 ��
.0efit,
r ki.D• J26
- Dst}-S
2' r
"3, // //
Wkres-
ae_ n � -',
¢�e,e `ems
d/C,L,4
tka
eve ,
e a
pt-
• CITY OF TUKWILA
COMPREHENSIVE WATER PLAN
SUMMARY AND RECOMMENDATIONS
Purpose
This summary presents the key conclusions and recommendations reached during
a detailed study of the Tukwila Water System. The comprehensive plan studied
the existing Tukwila Water System for adequacy of water supply, storage, pressure
and capacity of the distribution system. It also projected growth for the system
and determined necessary water system improvements to handle the anticipated
future demands. A comprehensive plan was developed for the system and is
shown on the attached drawing.
Study Area
The study included a discussion and analysis of the Tukwila Water System both
within and outside the City Limits, ihcluding interties with four adjacent
districts. The study area included approximately 9.8 square miles. Chapter III
of the Comprehensive Plan includes maps showing physical features, geology, soils,
surface and ground water characteristics as well as planning, zoning, population
and growth projection scenarios for the area. The entire document is on file
and available at the City of Tukwila, Department of Public Works.
Growth scenarios developed and studied are described below:
Scenario 1 - Existing Conditions
This is based on 1980. housing and employment figures.
This scenario established the development conditions
and population.
Scenario 2 - Vacant Land Built -Out
This scenario is developed according to the 1982
zoning ordinance by filling the vacant land to a total
build -out condition.
•
Scenario 3 Redevelopment Build -Out
This scenario assumes that portions of the planning
area will redevelop to high intensity land uses and
all vacant land will develop and infill in a higher
intensity use.
The number of residential houses, multi- family units, square footage of building
for various types of development - retail, professional office, industrial /ware-
house, processing /manufacturing and open space is projected for the various
scenarios and given in Chapter III of the Comprehensive Water Plan. Resident
population figures and employment figures are also derived for the various
scenarios. These scenarios establish the base data for assessing the adequacy
of the existing water system for each of the three conditions.
Design Criteria
Chapter V of the Comprehensive Water Plan presents a complete discussion of
minimum water system design and service requirements as required by the Washing-
ton State Department of Social and Health Services. These criteria include the
following categories:
. Planning Considerations
Reliability Considerations
. Distribution System Design (including 30 psi minimum water pressure)
Water Storage and Daily Supply Requirements
Recommended average daily water consumption for Tukwila for various types of
uses were calculated based on available water use data. From these figures,
design peaking factors were developed and used in the "Hydra" computer model
to size the critical transmission and distribution mains based on ultimate
fire flow requirements for Scenario III - Redevelopment Build -Out. An
average annual increase in Tukwila's water use of 3.4 percent was used to
estimate Tukwila's future water use and storage requirements. Storage re-
-2-
•
quirements include allowance for standby, equilization and fire storage
components. Appendix M of the Comprehensive Water Plari includes a list
of Tukwila's approved list of water system equipment and materials.
System Analysis and Proposed Improvements
This study determined that the existing water system has adequate water supply,
pressure in most locations, and . capacity in most locations. The system is pre-
sently deficient in: storage (Tukwila has no storage facilities); pressure at
higher elevations of North Hill; and is deficient in capacity in several lo-
cations due to small water mains. To correct these inadequacies, storage
facilities (10 million gallons [MG] at two sites), new water transmission lines,
larger water mains, and one pump station are recommended.
In order to minimize the cost for new water supplied to Tukwila by Seattle in
the future, it is recommended that two water wells be drilled (one in 1983 and
one in 1990 +) near the Green River within Tukwila to supply most of Tukwila's
new water needs over the next 25 years. The preliminary cost for a ground water
site feasibility study totals $4,500. This study will confirm the existence of
adequate ground water source and ground water quality. If this study confirms
that ground water is available, it is recommended that one 350 GPM municipal
water well be installed as part of Phase I (see below) at a total cost of
$168,000. Estimated annual savings for this well is projected to be $17,500
(1982 dollars) increasing to $123,000 (1992 dollars) based on the projected in-
crease in the price for "New" Seattle water.
The estimated cost for the Phase I recommended improvements totals $2,834,750.
and includes the following items:
CITY OF TUKWILA
PHASE I - WATER SYSTEM IMPROVEMENTS
COST ESTIMATE
Item No. Description
1 5 MG Storage Reservoir on West Hill
2 14" and 20" Main from new reservoir to valley
Estimated Cost in
1982 Dollars
$ 1,762,000.
430,000.
Item No.
• •
Estimated Cost in
Description 1982 Dollars
3 12" Main from North Hill to Southcenter
Area $ 308,000.
5 One Well 168,000.
8 Telemetering Controls on Seattle Taps 166,750.
TOTAL ESTIMATED COSTS: $ 2,884,750.
These Phase I improvements will satisfy 90 percent of Tukwila's immediate storage
needs as listed. In addition, a two (2) MG Storage tank is required in 1985 for
North Hill and another three (3) MG in 1997 at the West Hill Site.__ The initial
5 MG storage facility will eliminate Seattle's Peak Demand Charge which totaled
$36,000 in 1982 and would be expected to increase 5 to 10 percent per year without
storage facilities.
The Phase I transmission main and distribution improvements will satisfy about
17 percent of the improvements shown on the Comprehensive Water Plan (see attach-
ed Comprehensive Plan Map). The remaining distribution system improvements will
be completed over a 20 year period as required as part of developer extensions
and overall system improvements.
Implementation
Various funding alternatives to cover the Phase I costs are discussed in detail
in Chapter VII of the Comprehensive Water Plan. All of the needed water system
improvements are eligible for a Washington State DSHS Referendum 38 Construction
Grant covering 40 percent of the eligible construction costs. A three year -six
percent loan is available to cover engineering costs associated with the improve-
ments. It is recommended that a General Facilities Charge be imposed on all new
buildings for development and property that redevelops. In addition, an increase
in water rates is recommended which will help to pay for Phase I improvements.
These items are listed below under Recommendations.
-4-
able time and expen.e better used elsewhere. The iiir is presently
negotiating with Wa er.District No. 125 to trade this line for a
different service area in North Tukwila.
13. It is recommended that a uniform developer extension standard and
policy manual be written to administer and control extensions on
all new system extensions and improvements.
14. In order to minimize peak demand charges by the City of Seattle, it
is recommended that Tukwila pass an ordinance restricting all landscape
and lawn sprinkling to the evening hours (6 P.M. to 6 A.M.) until
Reservoir No. 1 is in operation.
15. It is recommended for any new large industrial water users, the City
requires the developer to consider and incorporate if possible, flow
reduction ideas such as recirculation and utilizing alternative sources
of water.
Assumptions and Alternatives
Assumptions and alternatives regarding type of system improvements are funda-
mental to the formation of a comprehensive water plan. The existing system
and its potential involves analysis of water source, water storage, distribu-
tion and transmission mains, interrelationship with neighboring facilities with
the consideration of annexation of adjoining areas inclusive or exclusive of
their utility systems. The following discussion examines these elements.
Water Source Improvements
Although the Seattle supply system is presently adequate for Tukwila's water
needs, present annual peak demand charges and possible future "New Water Use"
charges force consideration of other "New" water sources in the area. The Green
River is the only substantial surface water readily available in the study area.
-9
;Since considerable treat would be required to upgrade. river water
to State drinking water standards, the Green River is not considered a
feasible new water source.
As detailed in a groundwater study completed as part of the Comp Plan the
groundwater in the study area provides the potential to meet the water - supply
needs of Tukwila. The southern portion of Tukwila, within the Green River
Alluvial Aquifer, contains an estimated moderate to high water yield potential
for a groundwater supply. Since little is known about the quality of water in
this aquifer, it is recommended that an exploratory test well be installed in
order to test the water quality and yield of this aquifer. Assuming that the
groundwater is suitable in both quality and quantity, two water wells are pro-
posed at an estimated cost of $300,000. in two phases. Provided the City signs
a long term water supply contract with. Seattle, Seattle's permission would be
needed before well water could be developed and used as part of Tukwila's water
supply.
Water Storage Improvements
As discussed in Chapter V of the Comp Water Plan, the Washington State Depart-
ment of Social and Health Services (DSHS) Design Standards for Public Water
Supplies includes specific design requirements to insure the quality, pressure,
and reliability of any public water supply. Since the Tukwila water system has
no storage facilities, this plan includes sufficient storage phases over many.
years to satisfy State requirements. The following storage alternatives were
considered in determining the Recommended Plan.
No Storage
One alternative is to operate the water system "As Is" with no storage facili-
ties. In view of the DSHS requirements for reliability, the Tukwila system is
considered deficient since it is primarily dependent on two Seattle . supply lines.
-10-
Interties with other watesystems are valuable when localiwroblems occur,
but would be of little use if one of the Seattle mains is shutdown. Such a
situation will occur during the winter months, 1982 -1983 when the 48 inch West
Seattle Supply Line serving North Tukwila will be shutdown for several months
for maintenance work. As discussed in Chapter VI of the Comp Water Plan,
without adequate storage and flow control valves, the monthly Seattle peak
demand charge is estimated to increase from five to ten percent annually. Based
on this, the estimated demand charge the City will pay over 20 years if no storage
is provided, is $1,225,000 +.
Cooperative Storage Facility with Water District No.. 75
Although officials from Water District No. 75 have expressed some interest in a
cooperative storage facility in the vicinity of the District's existing Bow
Lake Reservoir, their 1982 Comprehensive Water Plan indicates future storage
facilities at their Mansion Hill storage site, located two miles south of the
Bow Lake site, where the District presently owns a reservoir site. A coopera-
tive reservoir would have to be located at about elevation 550 feet to serve
District No. 75 customers. Such a high elevation would require pumping water
from the Seattle system into the reservoir, and would require the use of a
pressure- reducing valve (PRV) to serve the Tukwila system. This alternative is
not considered feasible since the costs and reliability associated with pumping
and use of a large PRV would negate the advantages of a cooperative facility.
In addition,•the City of Seattle has indicated they would not be capable of
supplying the amount of water Tukwila needs at that location without major modifi-
cations.
Cooperative Storage Facility with Other Districts
Water District No. 125 has recently purchased a large storage interest in a
cooperative reservoir with Water District No. 20. District No. 125 is there -
fore not interested in additional storage capacity in the near future.
Due to long distances, Illation factors, and lower ores. systems, no
cooperative storage facilities were considered with the Cities oF,Kent or
Renton. The pressures in these water systems are too low to serve the
Tukwila system under normal operating conditions.
Storage Facilities on West Hill and North. Hill
This alternative includes reservoir sites on West Hill west of I -5 and on
North Hill north of I -405. No pumping or PRV facilities would be required
for the West Hill site since the reservoir would be located at elevation 330 +
(overflow elevation 360 +) so as to match the existing pressure zone in the Tukwila
water system. This reservoir would be filled and serve Tukwila through a common
new 20 inch transmission main utilizing the existing Seattle system meters and
Tukwila transmission system located in the valley. Phase I (1982) would include
one five million gallon (5 MG) reservoir plus transmission mains. Phase III
(1997) would add 3 MG of storage to the initial 5 MG for a total of 8 MG at the
West Hill site.
This alternative would also include .2 MG of storage as part of Phase II (1985)
to be located near the top of North Hill in North Tukwila. This facility would
be installed at elevation 200 feet ±, and a pumping plant (Phase II) would be
used to maintain the system's hydraulic gradient at 360 feet +. Again, no PRV's
would be necessary since all facilities would be located to maintain one pressure
zone at 145 psi. This reservoir would be filled and serve the City through a
common new (Phase I) 12 -inch transmission main connecting North Hill with the
Southcenter Area.
Installation of storage as previously discussed could eliminate the demand charge
and also save on insurance costs as insurance rates are based partially on system
reliability.,
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:Distribution and Transmin Mains
The Comprehensive Plan (drawing attached with this checklist) includes many new
and upsized water distribution and transmission mains. In addition, each project
is listed within one of the overall Comprehensive Plan Construction Schedules.
The proposed pipeline improvements were sized to meet or exceed the minimum pipe-
line size standards as presented in the chapter on design criteria. For critical
water mains, the "HYDRA" hydraulic computer model was used to size the mains to
insure adequate main capacity for peak flow conditions, based on Scenario III,
described in this summary.
Takeover of Segale Business Park Area
As part of this water plan, it is suggested that Tukwila take over that portion
of the water system within the Tukwila City Limits south of South 180th Street
presently served by Water District No. 75. The close proximity of this area to
proposed water storage and transmission facilities on West Hill would insure an
adequate water supply to the Segale Business Park and other locations further
south on the west side of the Green River. The extent of this service area
expansion might extend south of the Tukwila City Limits. The exact new service
boundaries would be established following negotiations with Water District No. 75.
Recommendations
• •
As a result of this study, the following recommendations and conclusions are
made as part of the City of Tukwila's Comprehensive Water Plan:
1. It is recommended that Tukwila adopt this plan utilizing the existing
single pressure zone concept.
2. It is recommended that Tukwila immediately proceed with the ground
water reconnaissance study to define the quantity and quality of
available ground water in the Tukwila Area.
3. It is recommended that Tukwila immediately locate and purchase the
necessary land and easements required for the storage and transmission
main improvements as recommended in this Plan.
4. It is recommended that the City apply for a DSHS Referendum 38 Grant
to cover 40 percent of the eligible construction costs of the Phase I
improvements. If required, a three year -six percent loan is available
to cover associated engineering costs.
5. It is recommended that Tukwila proceed with the necessary engineering
studies and design required to complete the Phase I improvements as
soon as possible.
6. It is recommended that Tukwila increase monthly water rates for all
water customers and impose a General Facility Charge on all new build-
ings for development and property that redevelops.
Residential
5/8 or 3/4 inch
PROPOSED WATER RATES
Base Rate
$ 4.00 /month +60't /100 cu.ft.
-5-
Commercial
1 inch
1 -1/2 inches
2 inches
3 inches
4 inches
6 inches
8 inches
$ 10.00
$ 22.50
$ 40.00
$ 90.00
$ 160.00
$ 360.00
$ 640.00
+60t /100 cu.ft.
+60/100 cu.ft.
+60/100 cu.ft.
+60/100 cu.ft.
+60/100 cu.ft.
+60/100 cu.ft.
+60/100 cu.ft.
These increases would constitute an average of 27 percent increase in residen-
tial water rates and from 80 percent to 250 percent increase in commercial /in-
dustrial water rates. These proposed water rates are summarized in Chapter VIII
of the Comprehensive Water Plan.
PROPOSED GENERAL FACILITIES CHARGE
Commercial /Industrial Buildings
25t per gross square foot
Residential
$400 per residence
$300 per multi -unit
7. In order to avoid a Public Works emergency and to maintain sufficient fire
flow capability in the north part of Tukwila, it is recommended that Tukwila
require the City of Seattle Water Department to maintain a minimum 2,000
gallon per minute (GPM) capacity capability at 150 psi at the Allentown 10
inch PRV station during the proposed 1983 -84 maintenance shutdown of the
48 inch West Seattle Supply Line.
8. With construction of the Phase I improvements on West Hill including a 5.0
MG reservoir, Tukwila's natural water services area would extend south to
include Segale Business Park and part of unincorporated King County. In
-6-
•
order to provide increased water service, increase City revenues, and pro-
vide additional control over a large service area close to Tukwila's fa-
cilities, it is recommended that Tukwila coordinate with Water District
No. 75 in taking over water service in the area from I -5 on the west to
the Green River on the east (including Segale Business Park) and from
South 180th Street on the north to South 204th Street on the south. This
area includes areas within Tukwila as well as Unincorporated King County
presently served by Water District No. 75. Development within the expanded
service area would then fall under this plan and be subject to the water
rates, general facilities charge and design and construction standards set
forth herein.
9. In order to protect the safety, health and welfare of the people working
and living in the area, it is recommended that Tukwila negotiate a take
over of the Independent Water Company's water system when the present
owners request. The present system is not well'maintained and the pressure
reducing valve (PRV) vault is in need of an overhaul. Because of the need-
ed improvements to the system, the system has little value and is a liabil-
ity to the present owner. The takeover of this system would insure that
future water system developments in that part of Tukwila would be designed
and constructed under this Plan as administered by the City.
Based on development Scenario II (Vacant Land Build -Out), commercial build-
ings totaling over 500,000 gross square feet are anticipated by 1995 within
this service area. The projected revenue from the proposed facilities
charge above would total approximately $125,000. In addition, the developers
would be required to install larger water mains per the enclosed Comprehen-
sive Plan Map. These improvements would reduce the future costs for up-
grading the Independent System.
-7-
• •
10. It is recommended that the Public Works Department review the Tukwila
Water System and Comprehensive Water Plan before any building larger
than 100,000 square feet is approved by the Tukwila Building Department.
11. This study determined that the Tukwila Water Department has sufficient
staff to properly operate and maintain the existing water system. With
the future additional storage wells, flow control, pump station and
expansion of the system to the south, additional maintenance personnel
may be needed.
Critical components of the Water Departments' Ongoing Preventive Main-
tenance Program include the following tasks which should not be curtailed
because of increased meter installations:
Cross Connection Program
Annual Hydrant Checks
Annual Valve Checks
Water Meter Testing
PRV Maintenance
Flow Tests
If operation and maintenance of the Tukwila water system requires more
manpower than is currently available, it is recommended that water meter
installations be subcontracted out to approved companies bonded to the
City. Water meter installations would be paid for by the developer but
would be controlled and administered by the City. If necessary, some
valve and hydrant checks could also be hired out as meter reading is
currently handled.
12. It is recommended that the City sell or trade the old 6 inch steel water
main located outside the City Limits near the Beacon Coal Mine Road. The
resolution of this problem water main will save the Water Department valu-
-8-
All
✓ able time and expense better used elsewhere. The Oty is presently
negotiating with Water District No. 125 to trade this line for a
different service area in North Tukwila.
13. It is recommended that a uniform developer extension standard and
policy manual be written to administer and control extensions on
all new system extensions and improvements.
14. In order to minimize peak demand charges by the City of Seattle, it
is recommended that Tukwila pass an ordinance restricting all landscape
and lawn sprinkling to the evening hours (6 P.M. to 6 A.M.) until
Reservoir Nu. 1 is in operation.
15. It is recommended for any new large industrial water users, the City
requires the developer to consider and incorporate if possible, flow
reduction ideas such as recirculation and utilizing alternative sources
of water.
TUKWILA
GENERAL REQUIREMENTS
HYDRANTS TYPICAL AT 300' C/C -
2.GATE VALVES TYPICAL AT S00 C/C II.•YIMUM
■
1
1
RES. NG I
5 M.G. INITIAL
8 MG. ULTIMATE
H.W. EL. 360'
.
LEGEND
o EXIST FIRE HYDRANT
EXIST GATE VALVE
aM METER - .
OPRV PRESSURE REDUCING VALVE '
TYPE OF PIPE
AC 'ASBESTOS CEMENT
CI CAST IRON
DI DUCTILE IRON .
—WATER DISTRICT BOUNDARIES
--CRY OF SEATTLE WATER MAINS
---a MAINS NOT SERVICED BY TUKWILA '
—14•055T. TUKWILA WATER DISTRIBUTION SYSTEM
CAPITAL IMPROVEMENT PROJECT NO 10 MEE APPENDIX 1
PROPOSED TUKWILA WATER DSTRIBUTION SYSTEM
Is6I1216TE wSPINI9 SEAT.
• IMIIIMIIRIMO•ITIq /T /• WATSON. WSW SM. •UUI.OINO•
COMPREHENSIVE WATER PLAN
FIGURE 21.
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WATER 0/5732/CT 75
CITY OF TUKWILA
WATER SERVICE AREA
PG. 3