Microbiological Well Contamination: One Water Supplier's Resolution to a Persistent Problem

摘要

The Greenlawn Water District, located within the Town of Huntington, Long Island, NY, provides water to a population of approximately 42,000, pumping an average of 5 mgd. During the summer months, the community produces water demands with peaks of 17 mgd. The District's Well No. 9 at the Buttercup Lane plant experienced persistent microbiological contamination over a three year period, which kept the well out of service for extended periods of time. Originally constructed in 1965, the well is 600 foot deep and is fitted with a deep well turbine pump. The well screen is set at 520 feet to 600 feet below grade. This screen setting extracts water from the Magothy formation in a strata that is primarily sand and mica. Above the Magothy aquifer is a clay layer (about 200 feet thick) and a shallower glacial aquifer.