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ENVIRONMENTAL HEALTH I)EPARTMENT <br /> awry <br /> °P SAN JOAQUIN COUNTY <br /> •G <br /> A Donna K. Heran, R.E.H.S. Program Coordinators <br /> 4LDirector 304 East Weber Avenue Third Floor <br /> Carl Borgman,R.E.H.S. <br /> ° <br /> Laurie A. Cotulla,R.E.H.S. Stockton,California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> tea' `�P Assistant Director Margaret Lagorio,R.E.H.S. <br /> {rF°R� Telephone:{209)468-3420 Robert McClellon,R.E.H.S. <br /> Fax: (209)464-0138 Jeff Carruesco,R.E.H.S. <br /> Website:www.sjgov.org,/ehd/ Kasey Foley,R.E.H.S. <br /> November 20, 2006 <br /> Sombun Atthithano COPY <br /> 11253 N. Thornton Road <br /> Stockton, California 95209 <br /> RE: Nitrates in your Water Well for Minor Subdivision PA-06-00020 (UP) <br /> At 11265 N. Thornton Road, Stockton <br /> i <br /> As part of the Site Approval process,water test results were submitted by Neil Anderson& <br /> Associates, in which a sample taken August 8, 2006, was tested for Nitrates and showed results <br /> of 161 ppm (parts per million) in your domestic well at the above referenced address. <br /> f <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 be used if this well is <br /> supplying drinking water. a <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 j <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 />