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Storm, contractor debris fouled pumps at Hamstring Lift Station; staff outlines repairs and possible capital fixes
Summary
Scott Murphy, wastewater manager for Infomark, reported two sanitary sewer overflows after a storm in early June and said debris left in a gravity line during earlier contractor work fouled four of seven pumps at the city’s Hamstring Lift Station.
Scott Murphy, wastewater manager for Infomark, told the Water and Sewer and Solid Waste Committee on July 8 that both major wastewater facilities met permit requirements for May and June but that two sanitary sewer overflows occurred after a heavy storm in early June.
Murphy said the overflows were linked to a failure at the Hamstring Lift Station during a weekend that produced about 4.1 inches of rain. "We had 2 sanitary sewer overflows that were related to, a pretty nasty storm that came through on the sixth and the June 7," Murphy said. The station’s peak flow during the event reached about 28,000,000 gallons per day, he added.
Murphy said the immediate cause was a failed comminuter (a large grinder unit) that is a single, nonredundant component at the station, combined with debris that had been left in the…
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