HomeMy WebLinkAboutECF_SEPA_Revised_DNS_260601_v3
Water and Land Resources Division
Department of Natural Resources and Parks
King Street Center 201 South Jackson Street, Suite 6300 Seattle, WA 98104-3855
206-477-4800 Fax 206-296-0192
TTY Relay: 711
State Environmental Policy Act
Revised Determination of Non-Significance
Date: June 1, 2026
Name of Proposal: Black River Pump Station High Use Engines Replacement Project Agency Contact: Mike Filizetti, Project Manager
Description of Proposal:
The Black River Pump Station (BRPS), located on a concrete dam that spans the Black River channel, conveys all Springbrook Creek flow to the Green River and is a critical component of the Green River flood control system. The King County Department of Natural Resources and Parks, Water and Land Resources Division, in coordination with the King County Flood
Control District, is undertaking a comprehensive program to replace or refurbish major
components of the BRPS. The original SEPA DNS scope of work included replacing one electric motor and two high-use engines (associated with pumps P1, P2, and P4, respectively) along with other critical systems.
Replacement of these two diesel engines included emissions control equipment to meet current
code requirements and exhaust pipes and silencers on the exterior of the pump house will be replaced for three engines. This revision addresses a minor addition to the scope of work due to discovery during construction authorized under the original SEPA. The replacement of the engine for pump P3 with a new automated engine, along with an associated replacement
equipment cooling water system (pump P16) to properly support future construction and
operational needs is now included in the scope. All construction work will be contained within the existing fenced areas north and south of the pump house, with most work taking place within the existing structures at the pump station.
Project construction started in 2021. Replacement of the P3 engine and installation of the P16
equipment cooling water system will start in 2026 as part of the on-going project improvements. Location of Proposal:
The Black River Pump Station is located at 550 Monster Road SW, Renton, WA 98057, in the southwest quarter of Section 13, Township 23 North, Range 4 East, W.M. This location is on
Docusign Envelope ID: DF4A707E-CA1D-80D3-827D-126346DE1C9D
the Black River near its confluence with the Green River. The combined rivers form the Duwamish River, which flows into Elliott Bay and the Puget Sound.
Responsible Official: Josh Baldi Position/Title: Division Director, Water and Land Resources Division
Address: 201 South Jackson Street, Suite 6300
Seattle, WA 98104-3855 DATE: SIGNATURE:
Proponent and Lead Agency: King County Department of Natural Resources and Parks Water and Land Resources Division Contact Person(s): Mike Filizetti, Project Manager, 206-477-2173
This determination is based on the following findings and conclusions: King County Water and Land Resources Division (lead agency) has revised its SEPA threshold Determination of Non-Significance issued on April 3, 2020, in consideration of the following changes:
Replacement of the engine for pump P3 with a new automated engine, along with an associated replacement equipment cooling system (P16) to properly support future construction and operational needs.
The Environmental Checklist was originally issued on April 3, 2020. An Addendum to the
Environmental Checklist, dated December 2025 has been prepared and will be distributed along with this revised determination. King County Water and Land Resources has reaffirmed that this proposal will not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.21C.030(2)(c).
THIS REVISED DETERMINATION OF NON-SIGNIFICANCE (DNS) is issued under Washington Administrative Code (WAC) 197-11-340(2)(F) and will be sent to agencies with jurisdiction. There is no public comment period required for this addendum.
For additional information, please contact:
Mike Filizetti, Project Manager mfilizetti@kingcounty.gov, 206-477-2173 King County Water and Land Resources Division
201 South Jackson Street, Suite 6300
Seattle, WA 98104-3855 There is no agency appeal of this decision.
Docusign Envelope ID: DF4A707E-CA1D-80D3-827D-126346DE1C9D
6/1/2026