HomeMy WebLinkAboutAttachment_C_Environmental_SEPA_Determintation_Revised_DNS
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
Water and Land Resources Division
Department of Natural Resources and Parks
King Street Center 201 South Jackson Street, Suite 600 Seattle, WA 98104-3855
206-296-6519 Fax 206-296-0192
TTY Relay: 711
Determination of Non-Significance
Name of Proposal: Black River Pump Station- High Use Engines Project
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 pump station protects against significant flood damage that could occur on developed lands in Renton, Kent, and Tukwila if the Green River flood flows back
up in the Black River.
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. This work
includes replacing the high-use engines (associated with pumps P1, P2, and P4) along with other critical systems. In addition, new emissions control equipment will be installed to meet current code requirements for the diesel engines that are being replaced. A bulk urea tank will be installed within the fenced area immediately north of the pump house to supply emissions control
equipment on the new engines. Exhaust pipes and silencers on the exterior of the pump house will
be replaced for three of the diesel engines.
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 is estimated to occur from fall 2020 through the end of 2021.
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 4E W.M.
The Black River Pump Station is located on 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.
Determination of Non-Significance Black River Pump Station Project
Page 2
Responsible Official: Josh Baldi
Position/Title: Division Director, Water and Land Resources Division
Address: 201 South Jackson Street, Suite 600 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): Tom Bean, Project Manager, 206-477-4638
The lead agency for this proposal has determined that it does not have a probable significant adverse impact on the environment. An Environmental Impact Statement (EIS) is not required
under Revised Code of Washington (RCW) 43.21C.030(2)(c). This decision was made after review of a completed environmental checklist and other information on file with the lead agency. THIS INFORMATION IS AVAILABLE TO THE PUBLIC ON REQUEST (for a nominal photocopying fee).
THIS DETERMINATION OF NON-SIGNIFICANCE (DNS) is issued under Washington Administrative Code (WAC) 197-11-340(2); the lead agency will not act on this proposal until after April 17, 2020. Comments must be submitted or postmarked by that date.
For additional information, please contact:
Tom Bean, Project Manger King County Water and Land Resources Division 201 South Jackson Street, Suite 600
Seattle, WA 98104-3855
Tom.bean@kingcounty.gov
Or visit: https://www.kingcounty.gov/depts/dnrp/wlr/sections-programs/river-floodplain-section/capital-projects/black-river-pump-station.aspx
March 26, 2020
Water and Land Resources Division
Department of Natural Resources and Parks
King Street Center
201 South Jackson Street, Suite 600
Seattle, WA 98104-3855
206-296-6519 Fax 206-296-0192
TTY Relay: 711
State Environmental Policy Act
Revised Determination of Non-Significance
Name of Proposal: Black River Pump Station High Use Engines Replacement Project
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. This work includes replacing the high-use engines (associated with
pumps P1, P2, and P4) along with other critical systems.
The new diesel engines will include 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 of the diesel engines.
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 is estimated to occur from fall 2020 through the end of 2021.
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.
The Black River Pump Station is located on 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.
DocuSign Envelope ID: 583A89F0-D34E-48E4-9131-5221A59FB8CF
Determination of Non-Significance
Black River Pump Station Project
Page 2
Responsible Official: Josh Baldi
Position/Title: Division Director, Water and Land Resources Division
Address: 201 South Jackson Street, Suite 600
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): Tom Bean, Project Manager, 206-477-4638
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:
The Environmental Checklist issued on April 3, 2020 described the new engines to replace
existing engines at the Black River Pump Station as meeting “USEPA Tier 4 emissions
standards, resulting in much cleaner combustion. Tier 4 engines are as much as 5 percent more
energy efficient than older engines and are designed to reduce particulate and nitrogen oxide
(NOx) emissions. Urea is injected into the emissions to control NOx, which is catalyzed into
nitrogen gas and water.” Instead, the engines will be replaced with modern Tier 3 diesel
engines, which will still result in cleaner combustion for their entire useful life (decades), with
reduced particulate matter, carbon monoxide (CO), and nitrogen oxides (NOx) compared to the
existing engines due to modern exhaust emissions control systems.
An Addendum to the Environmental Checklist has also 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 does not include additional
notice or comment period; the lead agency will not act on this proposal until after April 17,
2020. Comments must be submitted or postmarked by that date.
DocuSign Envelope ID: 583A89F0-D34E-48E4-9131-5221A59FB8CF
4/13/2020