The Lincoln Street Well is located on Lincoln Street adjacent to the Manchester High School.
It provides approximately 40% of Manchester's water.The well is a 24 inch diameter gravel packed well. It is installed at a depth of 68 feet in a confined sand and gravel deposit, with approximately 15 feet of clay overlying the water bearing material at the well. The well has a capacity of approximately 500 gallon per minute, or 720,000 gallons per day.Water pumped from the well is treated at the Lincoln Street Well Corrosion Control Facility.
The facility was built in 1997 to match the treatment provided by the Gravelly Pond water Treatment Plant. Treatment at the facility consists of disinfection, fluoridation, and corrosion control.
For disinfection, Sodium Hypochlorite is added to provide a residual level of disinfectant in the water mains. A residual level of disinfectant is needed because micro-organisms are ubiquitous and can even grow within a water distribution system, and a residual level of disinfectant helps prevent the re-growth of any micro-organisms within the piping. The target level of disinfectant residual for water leaving the facility is approximately the same level as that recommended by the American Water Works Association.
Fluoridation is an optional process used as to help prevent tooth decay. Fluoridation is accomplished at the facility by adding Sodium Fluoride to the water.
Corrosion control consists of adding chemicals to reduce the corrosivity of the water and to prevent lead and copper from entering the drinking water. At the Lincoln Street Well Corrosion Control Facility, two chemicals are used. The first, Potassium Hydroxide, is used to raise the pH of the water. The second, Zinc Orthophosphate, is used to provide a thin coating on the pipes.
Lincoln Street Well Water Treatment Chemicals
Chemical |
Use |
Dose |
Sodium Fluoride |
Fluoridation |
1.0 mg/l as fluoride |
Sodium Hypochlorite |
Disinfecting agent |
1 - 3 mg/l |
Potassium Hydroxide |
Strong base used to adjust the pH. |
30 - 60 mg/l |
Zinc Orthophosphate |
Corrosion inhibitor |
1 - 4 mg/l |
All of the chemicals used at the plant are certified by the National Sanitation Foundation for use in potable water systems and meet or exceed American Water Works standards. Material Safety Data Sheets for the chemicals are available from the DPW.
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