DEVENS — MassDevelopment is soliciting bids to upgrade the Barnum Road pump station.
The contract, bids for which opened Jan. 10, will include replacing equipment within the existing dry well and wet well, and constructing a new wet well with three new pumps, a flush valve, a new electrical panel, controllers and a remote alarm system.
Site work will include installing erosion and sedimentation controls, tree removal, a new gravel parking area and fencing. A backup liquid propane generator and propane tank will be installed behind the pump station.
The Devens water supply system consists of three gravel-packed wells — Shebokin, Mac Pherson and Patton — and one well field at the Grove Pond pumping station.
The work is part of a strategy to bring the water system into compliance with the lead and copper rule.
Water-quality testing done in 2006 determined the Devens water system exceeded action level for copper, a natural soil component that’s considered a secondary contaminant. It’s tested on an aesthetic, not a health-related, level.
Eleven for 40 sites tested registered above the action level for copper. Possible sources of contamination are corrosion of household plumbing, erosion of natural deposits and leaching from wood preservatives.
Copper is an essential nutrient, according to the water-quality report, but those who drink water containing copper in excess of the action level can experience gastronomic distress. Doing so over many years could result in liver or kidney damage.
A corrosion control study done by the engineering firm Wright-Pierce recommended a new control strategy to bring the water system into compliance with the lead and copper rule, according to the water study. Installing a newly designed system began in 2007. More recent water-system operating changes have greatly decreased the corrosive nature of Devens’ water chemistry.
According to the 2006 study, Devens water was below action level for regulated contaminants, including arsenic, barium, fluoride, nitrates and trihalomethanes — disinfectant byproducts.
With the exception of copper, it was below action level for secondary contaminants that include iron, manganese, calcium, chloride, magnesium, potassium, sulfate and zinc.