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Warr Acres adopts change order, gets wastewater master‑plan update; consultant recommends prioritized upsizing projects
Summary
Consultants reported results of a sanitary sewage evaluation (887 manholes inspected; 101 in very poor condition) and recommended priority upsizing projects that would use a proposed $10.2M loan. Council ratified a deductive change order on the 21‑inch interceptor that reduced project cost by $60,249 after switching some sections from CIPP to open cut.
Consultants updated the council Oct. 15 on the sanitary sewer evaluation study (SSES) and wastewater master plan. Staff said the SSES inspected about 887 manholes; consultants identified 101 as very poor condition and 176 as poor, with 155 showing evidence of surcharge and 243 showing infiltration. The consultant recommended prioritizing several upsizing projects — including upsizing a 4‑inch to 8‑inch on NW 50th/Meridian, replacing a deteriorated manhole and upsizing an undersized section on NW Expressway/MacArthur, and upsizing southern interceptor segments to 18 inches — as the initial phasing using a proposed $10.2 million loan.
Council also ratified a field change on the 21‑inch interceptor project. After pre‑construction CCTV and field conditions revealed smaller earlier pipe segments and in‑place lined sections, staff reduced CIPP quantities by 409 linear feet and used open trenching for the most feasible portion, avoiding extended bypass pumping. The negotiated field change produced a net deduct change order of $60,249. Project managers said the change limited mobilization and bypass costs and that open trenching will be recommended where right‑of‑way and site conditions allow; trenchless methods (CIPP) remain preferred for constrained yards and near structures.
Consultants said additional CCTV review and matching of GIS are ongoing; staff expects to continue rolling SSES findings into the master plan and to prioritize repairs based on the updated condition atlas. Council approved the change order by motion.
