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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> .y Unit Su errisors <br /> Donna K.Heran,R.E.H.S. P <br /> recoa 304 East Weber Avenue, Third Floor Carl Sorgnjan.R.E.H.S. <br /> Dit <br /> � � Mike Huggins, R.E.H.S.: R.W. <br /> Al Olsen,R.E.H.S. Stockton, California 9520_-_70S Douelas W. Wilson. R.E.H.S. <br /> • cQ., Program Afanager <br /> �IFOR� Telephone: (.09) 46$-3-1_0 Margaret Lagorio.R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. ` <br /> Progvam.Manager. Falx: (209) 464-0138 Robert McClellon.R.E.H.S. <br /> iMark Sarceltos. R.E.H.S. <br /> May 12, 2005 <br /> David Smith FILE p <br /> 407 N. Alpine Road <br /> Stockton, CA 95215 <br /> RE: Nitrates in your Water Well for PA-0500194 (Minor Subdivision) <br /> As part of the subdivision approval process, water test results were submitted by Chesney <br /> Consulting in which a sample taken April 30, 2004, was tested for Nitrates and showed results of <br /> 52 ppm (parts per million) in your domestic well at 767 North Alpine Road, Stockton, California. <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 /> I <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 bypassing 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 />