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San Joaquin County DIRECTOR <br /> 'O PO.u!N• co Donna Heran, REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> Q % 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 <br /> _ PROGRAM COORDINATORS <br /> Carl Borgman, REHS <br /> C4''•�":: =/'gip Website: www.sjgov.org/ehd Mike Huggins,REHS,RDI <br /> �r Foae� Margaret Lagorio,REHS <br /> Phone: (209) 468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley, REHS <br /> September 25, 2007 COPY <br /> Mr. Greg Rausser <br /> 12000 E. Liberty Road <br /> Gait, California 95632 <br /> RE: Nitrates in your Water Well for Minor Subdivision PA-06-00044 (MS) <br /> As part of the Land Use Application process, water test results were submitted by Neil Anderson <br /> & Associates c/o FGL Environmental in which a sample taken July 19, 2007, was tested for <br /> nitrates and showed results of 44.8 ppm (parts per million) in your domestic well at 12000 E. <br /> Liberty Road, Galt, California. <br /> The State Department of Health Services adopted a standard of 45 ppm for nitrates in public <br /> drinking water systems; however, private well owners are not legally required to meet this <br /> standard. As a precaution for yourself, members and guests, the Environmental Health <br /> Department would suggest that you have your domestic well tested annually to verify if the <br /> above-described chemical continues to be at state drinking standards. <br /> If your private well analysis for nitrate exceeds the State standard of 45 ppm again, the following <br /> alternatives are being provided for your guidance: <br /> 1. As a temporary measure, it is recommended that bottled drinking water be used if this well is <br /> supplying drinking water. <br /> 2. In cases where exposure may continue indefinitely, such as with contaminated private wells, <br /> installation of a water treatment device, such as a filter, may be advisable. However,using <br /> bottled water or installing a water treatment device at the kitchen water tap, will not stop <br /> exposure to nitrates in your private water supply. Most treatment units sold for home <br /> installation only treat water at the point of use, such as the kitchen faucet, and do not prevent <br /> exposure through skin contact, bathing or inhalation. As a result, point of entry filters, which <br /> treat water for the entire house, are recommended because they remove all potential sources <br /> of exposure. The"Reverse Osmosis Purification Filter" is the recommended water treatment <br /> device in this case. It operates by passing the well water through a series of filters and <br /> reverse osmosis membranes thereby removing the nitrate contaminant. Water treatment <br />