HomeMy WebLinkAboutTIS 2025-09-22 Item 1B - Grant Acceptance - Department of Ecology Grant for S 130th Bioretention PlantersThomas McLeod, Mayor
Public Works Department - Jen Tetatzin, PE, PMP - Director
INFORMATIONAL MEMORANDUM
TO: Transportation and Infrastructure Services Committee
FROM: Jen Tetatzin, Public Works Director
BY: Catrien de Boer, Public Works Analyst
CC: Mayor McLeod
DATE: September 19, 2025
SUBJECT: Riverton Stormwater Management Action Plan CIP— S 130th Bioretention Planters
Project No. 82541203
Department of Ecology Water Quality Combined Funding Grant Award
ISSUE
Accept a Washington State Department of Ecology (DOE) Water Quality Combined Grant to fund water
quality improvements in the amount of $294,950.
BACKGROUND
In 2022, Council authorized staff to accept a DOE grant to develop a Stormwater Management Action
Plan (SMAP) for the Riverton basin in Tukwila. Through this planning effort, several priority projects
were developed along with conceptual -level cost estimates.
DISCUSSION
In October 2024, staff submitted an application to the DOE Water Quality Combined Funding Program
to fund the design through 90% of bioretention planers in the vicinity of S 130th St to improve water
quality in Riverton Creek, a tributary of the Green-Duwamish River. Once complete, the planters will
slow stormwater before it is directed to conveyance pipes removing fine sediment and dissolved metals
from previously untreated stormwater. This project came out of the Riverton Basin SMAP and is in the
existing Capital Improvement Program. In July 2025, the City was notified that we received the full grant
award.
FISCAL IMPACT
The City was awarded a $294,950 grant from the DOE for the design of the S 130th Bioretention
Planters. The grant requires a 15% local city match, which is $52,050. The Project CIP, which comes
from Surface Water Fees, is sufficient to cover the match.
Project Budget
DOE Grant Award $294,950.00
City Match $ 52,050.00
Total $347,000.00
Fund Source
CIP Budget (412 Funds)
RECOMMENDATION
Council is being asked to accept a DOE Water Quality Grant Award in the amount of $294,950.00 and
consider this item on the Consent Agenda at the October 6th, 2025 Regular Council Meeting.
Attachments: 2025-2030 CIP Pg. 152
Vicinity and Map
49
DESCRIPTION:
JUSTIFICATION:
CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2025 to 2030
Riverton Stormwater Management Action Plan -
PROJECT: Project# 82541203
Program CIP
Project Manager Sherry Edquid Department Surface Water
This CI P is a program to implement the Stormwater Management Action Plan (SMAP) a new requirement
under the NPDES Permit. The SMAP directed the City to invest and prioritize one stream system the city
selected Riverton. The SMAP for Riverton Creek identifies four priority stormwater retrofits and a handful of
lower priority stormwater retrofits with the goal of improving water quality while accommodating future
growth in the basin. Of the four short-term projects we would begin design and possibly construction for
two of the four projects over the course of the next six years.
Washington State Department of Ecology will likely require us via the NPDES permit to begin implementing
the SMAP necessitating the need to begin design and construction these short-term retrofit projects. The
SMAP was also included as part of the Surface Water Comprehensive Ran (SWOP),
STATUS: The SMAP provided a basic project description and cost estim ate for these projects.
MAINTENANCE IMPACT: Surface Water and Transportation
COMMENT:
FINANCIAL (in thousands)
l am proposing to implement these two projects SMAP-4 Tukwila International ulevard: Bust Stop
60983 Water Quality Retrofit and SMAP-5 South 130th St Right of Way Bioretention Planters.
2025
2026
2027
2028
2029
2030
Beyond
TOTAL
Project Costs
Project Mgmt (Staff Time/Cost)
Design
Planning
Land (R/W)
Construction Mgmt.
Construction
Contingency
$ 20
$ 230
$ 10
$ -
$ 20
$ 30
$ 20
$ 130
$ 10
$ 120
$ 1,200
$ 100
$ 40
$ -
$ -
$ 35
$ 375
$ 40
$ 100
$ 390
$ 10
$ 10
$ 155
$ 1,575
$ 140
Total Project Costs
$ 260
$ 50
$ 1,580
$ 490
$ 2,380
Project Funding
Proposed Grant
Utility Revenues
General Fund Transfer
$ 208
$ 52
$ -
$ 40
$ 1,264
$ 158
$ 158
$ 392
$ 98
$ -
$ 1,904
$ 318
$ 158
Total Project Funding
$ 260
$ 50
$ 1,580
$ 490
$ 2,380
50
City of Burien
City of SeaTac
FIGURE 5
R. R IT P R, JECTS
TUKWILA SMAP I 33383
TU IA, AS ElJ \1
Data Sago.
Date 12(19/2023
DscImmer Th,s data ts not to survey accurac y and IS meant for plann[ng purposes only
Ake eet),
P1-'9
a;9149iie
ElementarySchool
re:
r j Tukwila City Limits
=I Riverton Creek Basin
Parcels
Short -Term Retrofit Projects
0 Long -Term Retrofit Projects
— Stream / Watercourse
Streets
6 „If 6
Otak
K C1-133300,33383VADLAGIS1MX1,33.383 RAwfla Known Issues Da. aprx
7jggrillfr VT!
jrlik
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Tly
Ja tIkt Ji�Yi/l/", o i m�atran i a�iiis�l � 6�4";�
4' WIDTH STREET SIDE STORMWATER PLANTERS
TOTAL AREA: 4,000 SF
HvEbVIIDf
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�o �p �rd
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J 'IYVr � " ��
S 130TH ST
il9llll/ ",IJQA Ord
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2 FT CONTOURS
TAXLOTS
EXISTING STORM DITCH
EXISTING STORM PIPE
PROPOSED STORM PIPE
oim/. G t r ire
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APPROXIMATELY 940 LF PROPOSED
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EXISTING PRIVATE
STORMWATER VAULT TRACT
f Wig'"
EXISTING STORM CATCH BASIN SCALE
EXISTING STORM MANHOLE
PROPOSED MANHOLE
PROPOSED STORMWATER PLANTER (BIORETENTION)
SMAP 5
Tukwila Stormwater Management Action Plan