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Hemet council hears design, cost and operating outlook for TCP treatment at Wells 15 and 16
Summary
Consultants gave a status update on a proposed granular activated carbon treatment system to remove 1,2,3‑trichloropropane (TCP) from two groundwater wells; construction is estimated at $4.9 million with an estimated 20‑year operations cost of about $25 million and treated water costing under $700 per acre‑foot.
The city received a design and status update June 24 on a proposed drinking‑water treatment system to remove 1,2,3‑trichloropropane (TCP) from two production wells, Wells 15 and 16. The system would be built at Henley Park and would combine flows from both wells into a single treatment train.
Consultant Greg Yen of N2W Engineering, representing the city’s design‑build team, told the council the system is sized to treat up to 2,200 gallons per minute (GPM) combined and would use granular activated carbon (GAC) in a two‑stage, lead‑lag configuration to reduce TCP to below California’s drinking‑water limit. “The city contracted with us to provide a drinking water treatment system for 2 of its groundwater wells, specifically removing, contaminant called 1 2 3 trichloropropane or TCP as we call it,” Yen said.
Why it matters: the wells are currently inactive because measured TCP concentrations exceed the state maximum…
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