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Biz park sewer lift to be replaced

By From page A4 | February 15, 2012

T&S Construction Co. will build a new sewer lift station at the El Dorado Hills Business Park after it was the low bidder at $1,285,900.

Including El Dorado Irrigation District construction management, consultants and testing, PG&E electricl service relocation and a contingency fund bring the total project costs to $1.6 million.

The lift station, one of 64 in the EID sewer system serving two treatment plants, pumps sewage directly from the business park and Four Seasons subdivision to the El Dorado Hills Wastewater Treatment Plant.

Originally built in 1983, the wet well is rotting out and parts for the pump are difficult to obtain if available at all.

“If we have a spill down there is it going to open the door to CalSPA?” asked Director George Wheeldon at the Jan. 23 EID meeting.

“I don’t have a crystal ball,” said  Mike Brink, senior engineer. “If we had a big spill we would have fines. If we have a spill it will go into Carson Creek.”

The creek is about 100 feet from the lift station.

“The most likely time for an equipment failure would be during a peak rain event, with associated high flows into the lift station due to inflow and infiltration of storm water into the collection system. It could take staff a minimum of an hour to respond to an alarm condition at the site. At peak inflow a sanitary sewer overflow could result in a spill of 30,000 gallons per hour or more. Even all four of the district’s pumping trucks working together may not have sufficient capacity to capture the volume of flows entering the lift station and prevent an SSO,” Brink wrote in his report to the board.

“I got to see it (Jan. 20) and it is in real disrepair,” said Director Alan Day, who represents that area.

Day also asked what the lifetime of the replacement lift station would be, to which Brink answered 30 years.

The existing building will house a new backup generator. A new building will be constructed to house the electrical equipment. A new concrete wet well and overflow vault will be built and the existing ones abandoned.

The project was approved by the board unanimously.

Michael Raffety

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