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Innovative Product Enables New Pharmacy To Build In Sensitive Watershed

When Rite Aid Corporation was planning to build a new pharmacy in Manchester, Maine, they had to deal with some of the most restrictive phosphorous runoff control standards in the state. The town had recently adopted new regulations similar to the proposed Maine DEP Stormwater Regulations that went into effect in July 1997. The rules are intended to prevent any further decline in water quality of nearby Cobbossecontee Lake which currently ranks as one of the six most polluted lakes in the state. (Phosphorus is the key pollutant responsible for alga blooms in lakes.)

Rite Aid's engineering consultant, Land Use Consultants, Inc. of Portland, worked closely with the town officials and representatives of the Cobbossee Watershed District to develop a stormwater management plan that would meet these new standards. After evaluating several conventional stormwater treatment methods without success, Land Use Consultants, Inc. turned to StormTreat™ Systems which is distributed by Eco-Cycle, Inc. of Manchester, ME.

The final design consisted of a conventional stormwater collection system of catch basins, swales, and piping which directs runoff to a flow-splitting structure. The most polluted first flush of runoff goes to an underground storage vault connected to five parallel StormTreat™ units. After passing through the StormTreat™ units, an underdrain system collects the treated effluent and discharges it to a highway storm drain. Any excess flow beyond the first flush is diverted to a conventional detention basin, prior to discharging to a highway drainage system.

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