HomeMy WebLinkAboutTIS 2025-01-27 Item 2A - Grant Acceptance - WA Department of Ecology Grant for S 131st St Drainage ImprovementsCity of Tukwila
Thomas McLeod, Mayor
Public Works ❑eportment - Pete Moyer, 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: January 24, 2025
SUBJECT: Surface Water Fund — S 131st St Drainage Improvements
Project No. 91641204
Department of Ecology Streamflow Restoration Grant Award
ISSUE
Accept a Washington State Department of Ecology (DOE) Streamflow Restoration grant for the S 131st
St Drainage Improvements project in the amount of $1,729,600.
BACKGROUND
The S 131st Drainage Improvement Project goal is to address flooding of roadway and adjacent private
properties along Southgate Creek, and to address issues that contribute to flooding, water quality,
barriers to fish migration and habitat degradation. The original contract's preliminary design and
hydraulic modeling indicated a broader approach would be necessary to resolve flooding.
DISCUSSION
In February 2024, City staff applied to the DOE Streamflow Restoration grant to fund design, permitting,
and acquisition expenses related to Phase II of the S 131st St Drainage Improvements project. Phase II
work will refine the 30% conceptual designs under Phase I and expand the site footprint to determine
useable/developable areas at adjacent parcels. While details will be determined through the design
process, the project goals are to enhance instream and stream buffer habitat, reduce flooding, reduce
routine maintenance, eliminate the need for dredging, reduce the amount of water bypassed through
the underground system, and increase water quality treatment. Grant funding will be used to complete
design, prepare bid documents, develop permit applications and construction documents.
In October 2024, the City was notified that we received the full grant award. The City is currently
completing preliminary design for the S 131st St Drainage Improvements Project and this funding will
be used to support the next phase.
FISCAL IMPACT
The City was awarded a $1,729,600 grant from the DOE for the S 131st Drainage Improvements
project. There is no local city match.
Project Budget
DOE Grant Award $1,729,600.00
Total $1,729,600.00
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S 131st St Drainage Improvements
January 24, 2025
Page 2
RECOMMENDATION
Council is being asked to accept a DOE Streamflow Restoration Grant Award, pending legal review, in
the amount of $1,729,600 and consider this item on the Consent Agenda at the February 3, 2025
Regular Council Meeting.
Attachments: Vicinity Map
2025-2030 CIP Page
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Figure 1. Southgate Creek Basin - Reaches and Phase I, II & III Locations
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City of Tukwila
CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2025 to 2030
PROJECT: S 131st Pl Drainage Improvements
Project # 91641204
Project Manager Joshua Hopkins Department Surface Water
DESCRIPTION:
Developing alternate horizontal alignment for Southgate Creek in conjunction with replacing a fish barrier 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.
Project will include 1-year contract maintenance and typically 2-to-4 years of plant establishment. Project
MAINTENANCE IMPACT:
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 acquisition
COMMENT:
grant to support the expanded hydraulic analysis. Assumes estimated 2028 construction.
FINANCIAL (in thousands)
2025
2026
2027
2028
2029
2030
Beyond
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
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