District fixes PLC programming defect; CCTV crews clear trunk line two-thirds full of rock

Operations staff reported two separate operational findings and remediation steps during the monthly metrics presentation.

First, staff described a programming defect in the PLC (programmable logic controller) at Pump Station 15 that caused a low-level lockout condition: technicians worked with an automation contractor to revise logic so the station will not be prevented from running by an erroneous low-level interlock. Staff said they tested other major stations and found similar logic in stations 12–14 and will update PLC programs across those stations to remove the deficiency.

"We're gonna go ahead and have all those PLC programs reupdated so that we can eliminate this deficiency in the future," operations staff said, noting the work is underway with a target of completing the updates in July.

Separately, CCTV inspection crews found heavy accumulation of gravel and grit in a 16-inch trunk main at Laurel and McAllister — roughly two-thirds full — and spent several days clearing the debris. Staff reported the district will shorten the cleaning cycle from every three years to every two years at that location to monitor re-accumulation and prevent flow restrictions.

Staff characterized the two items as examples of proactive maintenance and credited earlier capital work with preventing a spill event during a recent wet period. The board commended staff for the rapid response and corrective planning.