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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