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ASSESSING METHODS TO DETERMINE WHEN HYDROGEOLOGIC BARRIERS EXIST THAT RESTRICT/PROHIBIT THE TRANSPORT OF MICROBIAL CONTAMINANTS INTO THE CAPTURE ZONE OF PUBLIC WATER SYSTEM WELLS.
Impact/Purpose:
The work will be used by the Ohio and Minnesota drinking water programs to help them develop protocols for determining when barriers exist that restrict/prohibit the subsurface transport of microbial contaminants into the capture zone of public water system wells. The work will help the Ohio and Minnesota drinking water programs determine when it is appropriate to allow fecal indicator monitoring relief to public water systems when implementing a proposed National Primary Drinking Water Regulation, called the Ground Water Rule. The Ground Water Rule will allow monitoring relief when a State determines that effective contaminant barriers are in place that prohibit the subsurface transport of microbial contaminants into the capture zone of public water system wells.
Description:
The product is an analysis performed by two state drinking water programs (MN and OH), testing well water for the presence or absence of fecal indicators (total coliforms, coliphages, and enterococci), to assess the effectiveness of hydrogeologic barrier methodologies being developed in those states.