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City approves tank rehabilitation work; Aten tank expected offline 3–4 months
Summary
Council awarded a contract to Total Industries Inc. for tank modifications and a new ventilation system. Staff said the project will be staged to avoid complete service loss but residents may see reduced pressures while the Aten tank is out of service for three to four months; work is scheduled for completion by February.
The Imperial City Council approved a contract to Total Industries Inc. for rehabilitation work on two water tanks, including tank modifications and a new ventilation system. Public Works presenter David Dale said the project came in under the original overall budget and will be timed for lower seasonal demand.
Dale explained that the city rejected an earlier round of bids, rebid the project and received lower estimates. He said the project cost came in approximately $277,000 lower than earlier bids and remains within the original $1.1 million budget. "The bids came in, as expected, lower. In this case, it was approximately $277,000 lower than the original bids," Dale said.
Dale told the council the Aten tank will be taken out of service for repairs for roughly three to four months while crews rehabilitate it; the shop tank will also be drained and inspected, but the two tanks will not be down at the same time. "The Aten tank will most likely be down for 3, possibly 4 months while we're doing the work," he said. Reduced pressures in the affected neighborhood are possible during rehabilitation, he warned.
Dale added that modifications include new vents and forced-air equipment intended to reduce trihalomethane (TTHM) formation. He also said the city is designing a new tank at the water plant to provide future redundancy.
Council approved the contract by motion; the clerk recorded the vote as "Motion carries 5 0." Staff said there were three bids on the rebid and no bid protests.
Why it matters: Tank rehabilitation is routine maintenance for potable water systems, but a multi-month outage for a single tank can reduce water pressure for nearby customers and require operational staging to maintain service levels.
Next steps: Staff will execute the contract, begin mobilization in late October (when demand is lower), and schedule work so tanks are not taken offline simultaneously. The design process for a new plant tank continues to provide future backup capacity.
