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San Joaquin County DIRECTOR <br /> ° Environmental Health Department th Det # °onna"era",REHS <br /> PP.. <br /> cp p ASSISTANT DIRECTOR <br /> r. z 600 East Main Street Laurie Cotulla,REHS <br /> a: a <br /> Stockton, California 95202-3025 PROGRAM COORDINATORS <br /> • Carl Borgman,REHS <br /> ' Mike Huggins, REHS, RDI <br /> cq C�F oRa�P Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> Rhone: (209)468.3420 Robert McClellon, REHS <br /> August 2, 2007 Fax: (209)464-0138 Jeff Carruesco, REHS, RD] <br /> Kasey Foley, REHS <br /> Mr. Barjinder Singh <br /> 3703 West'Grant Line Road <br /> Tracy, California 95304 <br /> RE: Nitrates in your Water Well for Site Approval PA-04-00351 (GP) <br /> As part of the General Plan Amendment process, water test results were submitted by Chesney <br /> Consulting in which samples taken May 3, 2007 was tested for nitrates and showed results of 46 <br /> parts per million (58 ppm) in your domestic well at 3703 West Grant Line Road, Tracy. <br /> The State Department of Health Services adopted a standard of 45 parts per million(ppm) for <br /> nitrates in public drinking water systems; however, private well owners are not legally required <br /> to meet this standard. As a precaution for yourself, members and guests, the Environmental <br /> Health Department would suggest that you have your domestic well tested annually to verify if <br /> the above-described chemical continues to be above 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 /> w 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 />{ equipment suppliers and installers are listed in your phone directory yellow pages under <br /> "Water Filtration&Purification Equipment." <br /> 3. A replacement well is also an alternative for providing uncontaminated water.' It is <br /> a recommended that a test well be drilled, in order to determine water quality prior to final <br /> placement of the well. Water quality may be determined and monitored through water sample <br />