HomeMy WebLinkAboutTIS 2025-03-24 Item 2B - Grant Acceptance - WA State Department of Ecology for S 131st St / Southgate Creek Drainage ImprovementsCity of Tukwila
Thomas McLeod, Mayor
Pub[rc Works Department - Pete Mayer, Interim Director
INFORMATIONAL MEMORANDUM
TO: Transportation and Infrastructure Services Committee
FROM: Pete Mayer, Deputy City Administrator/ Interim Public Works Director
BY: Catrien de Boer, Public Works Analyst
CC: Mayor McLeod
DATE: March 21, 2025
SUBJECT: Surface Water Fund — S 131St/Southgate Creek Drainage Improvements
Project No. 91641204
Dept. of Ecology Community Based Public Private Partnership (CBP3) Grant Award
ISSUE
Accept a Washington State Department of Ecology (DOE) Community Based Public Private
Partnership (CBP3) grant for S 131st St/Southgate Creek Drainage Improvements project in the amount
of $602,150.00
BACKGROUND
This project builds upon the S 131st St Drainage Improvement Project to address water quality,
flooding, and drainage concerns in Southgate Creek. Southgate Creek runs through and around a
commercial/light industrial business community that experiences and contributes to drainage issues. A
historic landslide upstream and intensive land use development have caused increased erosion and
sediment transport, impacting best management practices (BMPs) in the business community and
contributing to roadway flooding and stream degradation issues. The project team intends to work with
private partners to take a wholistic approach to address issues that contribute to flooding, water quality,
barriers to fish migration and habitat degradation in Southgate Creek.
DISCUSSION
In mid- 2024, City staff began attending the CBP3 Technical Assistance Sessions provided by the
Department of Ecology, Herrera Environmental Inc, and Environmental Incentives. These sessions
focused on exploring partnership and procurement options to more efficiently address stormwater
concerns throughout the State. In October 2024, the City applied to the CBP3 Planning Grant and was
notified that we received the full grant award early 2025.
This grant has two primary tasks.
Task 1 - CBP3 Planning: The team will develop a CBP3 toolkit consisting of planning documents which
will consider traditional and alternative contracting methods to solve flooding and water quality issues
and prioritize stormwater system improvements. Deliverables for this task include an engagement plan,
a draft Request for Proposals, and a draft contract. It will provide the City with resources for the
planning, funding, and construction of future stormwater treatment and flow control facilities.
Task 2 — Preliminary Engineering: The Team will engage a consultant to support outreach to relevant
landowners, conduct a land survey, and prepare a Critical Area report of stormwater drainage in
Southgate Creek, among other technical reports.
83
These planning tasks will inform the next phase of design and eventually construction to address water
quality and alleviate flooding, among other co -benefits.
FISCAL IMPACT
The City was awarded a $602,150 grant from the Department of Ecology for the Southgate Creek
CBP3 Planning project. There is no local city match.
Project Budget
DOE Grant Award $602,150.00
Total $602,150.00
RECOMMENDATION
Council is being asked to accept a Department of Ecology Community Based Public Private
Partnership (CBP3) research and planning grant, pending legal review, in the amount of $602,150 and
consider this item on the Consent Agenda at the April 7, 2025 Regular Council Meeting.
Attachments: Vicinity Map
2025-2030 CIP Page
84
CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2025 to 2030
PROJECT: S 131st Pt Drainage Improvements
Project # 91641204
Project Manager Joshua Hop 1.1
Department Surface Water
Developing alternate horizontal alignment for Southgate Creek in conjunction with replacing a fish barrier
DESCRIPTION: culvert. Scope expanded in 2024 to increase hydraulic analysis limits to address persistent flooding not
addressed with the preliminary hydraulic design.
JUSTIFICATION:
Southgate Creek overtops its bank several times per year during storm events and runs through private
property.
Debris is deposited within a private driveway and storm system.
STATUS:
HPA permitted dredging is performed annually on the creek to remove excess sedimentation to reduce the
likelihood of flooding.
MAINTENANCE IMPACT:
Project will include 1-year contract maintenance and typically 2-to-4 years of plant establishment. Project
improvements will be turned over to surface water division for routine maintenance.
Project applied for Department of Ecology design development funding and Conservation Futures property
`'"i ii "il 1.
acquisition
grant to support
2025
the expanded
2026
hydraulic
2027
analysis.
2028
Assumes
2029
estimated
2030
2028 construction.
Beyond
'FINANCIAL (in thousands)
TOTAL
Project Costs
Project Mgmt (Staff Time/Cost)
$ 25
$ 25
$ -
$ 25
$ -
$ -
$ -
$ 75
Planning
$ 780
$ 600
$ -
$ -
$ -
$ -
$ -
$ 1,380
Land (R/W)
$ 1,000
$ 1,000
$ -
$ -
$ -
$ -
$ -
$ 2,000
Construction Mgmt.
$ -
$ -
$ -
$ 400
$ -
$ -
$ -
$ 400
Construction
$ -
$ -
$ -
$ 2,000
$ -
$ -
$ -
$ 2,000
Total Project Costs
$ 1,805
$ 1,625
$ -
$ 2,425
$ -
$ -
$ -
$ 5,855
Project Funding
Awarded Grant
$ 706
$ -
$ -
$ -
$ -
$ -
$ -
$ 706
Proposed Grant
$ 1,105
$ 1,625
$ -
$ 1,600
$ -
$ -
$ -
$ 4,330
Utility Revenues
$ 205
$ -
$ -
$ 825
$ -
$ -
$ -
$ 1,030
(Total Project Funding
$ 2,016
$ 1,625
$ -
$ 2,425
$ -
$ -
$ -
$ 6,066
Return to CIP TOC
85
ib