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ENVIRONMENTAL HEALT"EPARTMENT <br /> C4040) <br /> SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.E.H.S. Unit Supervisors <br /> Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins,R.E.H.S., R.D.I. <br /> Program Manager Douglas W.Wilson, R.E.H.S. <br /> Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> Fax: (209)464-0138 Robert McClellon, R.E.H.S. <br /> April 20, 2007 Website:www.sjgov.org/ehd/ Jeff Carruuesco, R.E.H.S. <br /> Sharon Stokes COPY <br /> 7500 W. Kile Road <br /> Lodi, California 95240 <br /> RE: Nitrates in your Water Well for Site Approval PA-06-00671 (MS) <br /> As part of the Minor Subdivision process, water test results were submitted by Chesney <br /> Consulting in which samples taken March 28, 2007 was tested for nitrates and showed results of <br /> 50.4 parts per million(ppm) in your domestic well at 7500 W. Kile Road, Lodi. <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 /> 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 /> 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 />