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Workshop: Sanitary‑sewer plan shows aging pipes, I&I fixes and cost‑saving trenchless repairs
Summary
Public Works presented the 2026 sanitary‑sewer comprehensive plan draft, including a 21‑meter flow‑monitoring calibration program, modeling of 10‑ and 25‑year storm events, capital projects lists (10‑ and 20‑year horizons), and operations updates highlighting trenchless techniques (quick‑lock, CIPP) and a focused I&I program in the Lindenhall basin; staff warned of King County rate increases that will affect local sewer bills.
At a May 5 council workshop, Public Works staff introduced the draft 2026 Sanitary Sewer Comprehensive Plan and operations work to keep the city’s sewer system functioning. Drew Holcomb (Public Works Engineering) described the modeling approach — combining 20‑year growth projections with flow monitoring from 21 meters (11 city meters and 10 King County meters) to calibrate a hydraulic model and identify capacity projects. The plan is intended to produce a capital improvement program (CIP) split into 10‑ and 20‑year horizons and will proceed through financial analysis, SEPA review and concurrent reviews by the Washington State Department of Ecology and the King County Utility Technical Review Committee.
Operations…
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