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aa0/ E �lP/1C11 Carp Kal PUBLIC HEALTH SERVICES SAN JOAQUIN COUNTY z ENVIRONMENTAL HEALTH DMSION " Karen Furst, M.D., M.P.H., Health Officer c.• , p.. ��iFORN� 304 East Weber Avenue,Third Floor• Stockton, CA 95202 209/468-3420 July 31, 2000 George Lagorio and E TRS FILE COP Y 2771 East French Camp Road French Camp, California 95336 RE: Nitrate Loading/Soil Suitability Study for GP-99-11 A soil suitability study was submitted by Valley Ag Research in which a test for Nitrate was tested for and showed results of 52 ppm (parts per million) in your domestic well at 2201 East French Camp Road. 11 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 and family, we would suggest that you have your domestic well re-tested to verify the above sample results. The Nitrate Loading Study also indicated the following: Possible explanations for these high nitrate concentrations are found in the land use: The domestic well to the west of the property is near fertilizer(UN 32%) storage and mix tanks which have in all probability caused this high nitrate concentration of 52 ppm (1). If your private and/or agricultural well analysis for nitrate exceeded 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 if it is 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. As a result, point of en 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." A Division of San Joaquin County Health Care Scrvices