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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> �O PO O''N'•..CD Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman, REHS <br /> Mike Huggins, REHS, RDI <br /> cq �:P Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> �IFOR <br /> Phone: (209) 468-3420 Robert McClellan, REHS <br /> January 8, 2009 Fax: (209) 464-0138 Jeff Carruesco,U <br /> Foley, R HREHS, RDI <br /> G & L Ranch LLC COPKasey <br /> Scannavino Property <br /> 5463 Cherokee Road <br /> Stockton, CA 95215 <br /> Subject: Nitrates in your Water Well for Minor Subdivision Approval PA-0800362 (MS) <br /> As part of the Minor Subdivision Approval process, water test results were submitted by Neil O. <br /> Anderson and Associates in which samples taken October 31, 2008, were tested for nitrates <br /> and showed results of 95 mg1L parts per million (ppm) in your domestic well at 3650 North <br /> Overhiser Road, Stockton, CA. <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 owners are not legally required to <br /> 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 <br /> following 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 <br /> is 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 <br /> prevent exposure through skin contact, bathing or inhalation. As a result, point of entry <br /> filters, which treat water for the entire house, are recommended because they remove all <br /> potential sources of exposure. The "Reverse Osmosis Purification Filter" is the <br /> recommended water treatment device in this case. It operates by passing the well water <br /> through a series of filters and reverse osmosis membranes thereby removing the nitrate <br /> contaminant. Water treatment equipment suppliers and installers are listed in your phone <br /> directory yellow pages under "Water Filtration & Purification Equipment." <br /> 3. A replacement well is also an alternative for providing uncontaminated water. It is <br /> 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 <br />