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ENVIRONMENTAL HEALTH -DEPARTMENT Donna K. Heran, R.E.H.S. SAN JOAQUIN COUNTY x Director 304 East Weber Avenue,Third Floor l B r Supervisors Carl Borgman,R.E.H.S. Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins,R.E.H.S., R.D.I. Program Manager Telephone: (209)468-3420 Douglas g as W Wilson, R.E.H.S. oq t F R�`P Margaret Lagorio,R.E.H.S. Fax: (209)464-0138 Robert McClellon, R.E.H.S. April 6, 2007 Website:www.sjgov.org/ehd/ Jeff Catruesco, R.E.H.S. Michael &Wendy Stokes COPY 7581 W. Kile Road Thornton,California 95686 RE: Nitrates in your Water Well for Site Approval PA-03-00025 (MS) As part of the Site Approval process, water test results were submitted by Chesney Consulting in which samples taken March 29, 2007 was tested for nitrates and showed results of 46 parts per million (ppm) in your South domestic well at 7581 W. Kile Road, Thornton. The State Department of Health Services adopted a standard of 45 parts per million(ppm)for nitrates in public drinking water systems;however,private well owners are not legally required to meet this standard. As a precaution for yourself, members and guests,the Environmental Health Department would suggest that you have your domestic well tested annually to verify if the above-described chemical continues to be above state drinking standards. If your private well analysis for nitrate exceeds the State standard of 45 ppm again,the following alternatives are being provided for your guidance: 1. As a temporary measure, it is recommended that bottled drinking water be used if this well is supplying drinking water. 2. In cases where exposure may continue indefinitely, such as with contaminated private wells, installation of a water treatment device such as a filter,may be advisable. However,using bottled water or installing a water treatment device at the kitchen water tap,will not stop exposure to nitrates in your private water supply. Most treatment units sold for home installation only treat water at the point of use, such as the kitchen faucet,and do not prevent exposure through skin contact,bathing or inhalation. As a result,point of entry filters,which treat water for the entire house, are recommended because they remove all potential sources of exposure. The"Reverse Osmosis Purification Filter" is the recommended water treatment device in this case. It operates by passing the well water through a series of filters and reverse osmosis membranes thereby removing the nitrate contaminant. Water treatment equipment suppliers and installers are listed in your phone directory yellow pages under "Water Filtration&Purification Equipment." 3. A replacement well is also an alternative for providing uncontaminated water. It is recommended that a test well be drilled, in order to determine water quality prior to final placement of the well. Water quality may be determined and monitored through water sample