Notice of Application
NOTICE IS HEREBY GIVEN that the City of Sumner has received a SEPA application for improvements to the existing Waste Water Treatment Plant (WWTP). Additional details can be found below and in the project documents.
The public has the right to review the contents of the official file for the proposal, provide written comments, and request a copy of the final decision.
Comments may be emailed to the staff contact below, submitted or mailed to the attention of Scott Waller at 1104 Maple St. Sumner, WA 98390. Comments will be accepted if filed with the Development Services Department on or before May 23, 2025
Project Name: Waste Water Treatment Plant Biosolids Modernization
Permit Application Number: SEPA-2025-0007
Location: 13114 63rd Street East Sumner, WA 98390
Parcel(s) #: 4250001210, 4250001080 and 4250001220
Description of Proposal: Replace components of the existing Class A biosolids treatment system at the City’s WWTP that are either capacity-limited or reaching the end of their service life. Scope of work includes:
- Expansion of the existing Solids Handling Building to house the new biosolids drying equipment. The building expansion will be a single-story structure, equal in height to the existing Solids Handling Building.
- Demolition of the existing Sludge Haul Truck Loading Bay on the south side of the Solids Handling Building, along with the existing canopy/roof structure.
- Install the following new/replacement equipment in the Solids Handling Building and building expansion: New dewatered biosolids conveyors; A new dewatered biosolids cake pump to feed the new dryer; A new indirect biosolids dryer; Two new thermal fluid heaters each capable of utilizing either digester gas or natural gas along with the associated thermal fluid pumping systems; Dried biosolids conveyance, cooling and screening systems; Replacement of the existing sludge storage hopper augers and drive motors; New waste activated sludge thickening system including a rotary screen thickener, sludge pumps, and polymer system; New in-line sludge grinders on the suction side of the digester recirculation pumps; New restroom; Odor control system modifications.
- Construction of a new Sludge Haul Truck Loading Bay on the south side of the new Solids Handling Building Expansion, including truck scales, automation of load distribution in the haul truck bed/container, and dust control systems.
- Construction and subsequent demolition of a temporary Sludge Haul Truck Loading Bay for use during the demolition of the existing Sludge Haul Truck Loading Bay and the construction of the new Solids Building Expansion and Loading Bay.
- Demolition of existing dissolved air floatation thickener and associated equipment in the Equipment Building 2.
- Replacement of the existing rotary lobe thickened primary sludge pumps with a new progressing cavity pump.
- Raise the walls of the existing central holding tank an additional 6 feet and removal and reinstallation of the existing mechanism bridge and covers once the walls have been raised.
- New digester gas compressor and treatment system, including H2S and moisture removal.
- New 4-inch enclosed waste gas burner that will meet all applicable Puget Sound Clean Air Agency regulations.
- Install new/relocated/modified process and yard piping, including drains, potable water, natural gas, digester gas, sludge, non-potable water and stormwater piping.
- Install new power distribution, controls and instrumentation systems for all modified and new treatment plant components. New motor control equipment will be installed in the existing Solids Handling Building Electrical Room or in the existing generator room that will be repurposed into a new electrical room.
- Demolish existing diesel fuel storage tank.
- Install a new diesel generator to provide standby power to the portions of the liquid stream system that are powered from the Solids Handling Building and to critical solids handling components. The generator will be housed in a stand-alone weatherproof acoustic enclosure with sub-base fuel storage.
- Pave currently pervious areas within the WWTP site including approximately 670 sf north of the UV Disinfection Facility and 220 sf between the new generator and the Solids Handling Building expansion.
- Install a gate across State Street and fence the north parking lot area to provide added security for the WWTP. The gate will be installed at the south end of State Street after the existing crosswalk, at approximately the intersection of State Street and 63rdStreet E.
Install a paved vehicle turn-around in the vicinity of the new gate on State Street. New paved area: approximately 1,180 sf. - Remove 18 ornamental shrubs, two fruit trees, one cedar tree and 3 pine trees. Plant native trees and shrubs, at a 2:1 ratio, to mitigate for the removal of vegetation.
Applicant:
City of Sumner
Michael Kosa
1104 Maple Street, Ste 260
Sumner, WA 98390
Contact – Doug Welch, Gray and Osborne, Inc.
1130 Rainier Ave S, Seattle, WA 98144
206-283-3206
dwelch@g-o.com
Date of Application: March 27, 2025
Date of Complete Application: March 27, 2025
Hearing Date: No hearing is scheduled for this SEPA, zoning CUP and Shoreline permits will require hearings to be noticed at a future date.
Location/Zoom Link: NA for SEPA
Zoning: Project takes place in the low-density residential zone with a comprehensive plan designation of low-density residential and public private utilities and facilities.
SEPA: MDNS is likely to be issued
Other Required Permits:
-Shoreline Substantial Development Permit
-Shoreline Variance (required for improvements located within the 200 of Urban Conservancy Buffer for the Puyallup and White Rivers)
-Shoreline Conditional Use Permit application (required for utility improvements in the Urban Conservancy Environment
-Zoning Conditional Use Permit (required for upgrading the WWTP within the Low Density Residential Zone (LDR) per SMC 18.12.050(F)).
-Habitat Management Plan (required per SMC 16.56.080 to assess potential project effects on
fish and wildlife habitat)
-Notice of Construction (NOC) Approval – Puget Sound Clean Air Agency.
-Site development permit(s)
-Compliance with all State and Federal regulations
Associated Documents:
Comment Period(s): Any persons desiring to submit written comments concerning this application may submit written comments to Scott Waller of the Development Services Department. City of Sumner, 1104 Maple Street, Sumner, WA 98390 no later than May 23, 2025
Staff Contact: For comments/questions, please contact Scott Waller, Senior Planner 253-299-5527, scottw@sumnerwa.gov
