3815_PGSF WMVD Pkg 2_Vol 4-3_03.03.2026_BXWA_Certified

MEMORANDUM Abandonment Close Out Report for Puget Sound Outfall No. 4, Work Order 2018 1433 FROM: Brian Doolan, P.E. Sewer/Drainage Maintenance Supervisor DATE: February 24, 2021 PSO 4 Abandonment Work Plan (submitted February 19, 2020) The City of Everett’s plans to abandon Puget Sound Outfall No. 4 (PSO 4) were submitted to the Department of Ecology on February 19, 2020. PSO 4 runs through the former Kimberly Clark (KC) upland property. The PSO4 pipeline previously carried stormwater from the local collection basin and infrequently the combined sewer overflow from the City’s Lift Station No. 5. Approximately seven acres of storm water from two private parking lots and a small area of West Marine View Drive flowed through the line and out PS0 4 whenever it rained. When PSO 4 was functional, stormwater (that bypassed LS No. 5) or combined sewer overflows (from LS No. 5) entered a manhole east of the railroad tracks and were carried through a 10-inch pipe under the tracks. The PSO 4 pipeline also carried the historical discharges originating from the KC site. The abandonment of PSO 4 has resulted in no further stormwater or combined sewer overflow discharges from the outfall. With Ecology Water Quality approval, city forces have temporarily re-routed PSO 4 stormwater and combined sewer flows to combine with the city’s PSO No. 5 located at Lift Station No. 3.PSO 4 is permitted by Ecology to discharge combined sewer overflows and stormwater. The City of Everett’s NPDES wastewater collection and treatment permit, Permit No. WA0024490 (expired October 30, 2020 and now administratively extended), lists PSO 4 as a permitted point of discharge for combined sewer (Section S.8); stormwater discharges from PSO 4 and the city’s stormwater collection are covered under the Western Washington Phase II Stormwater General Permit (effective date August 1, 2019). CITY OF EVERETT Public Works