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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY Q r, <br /> fOGI hHANNA M.D.,MT H Il I'wi; <br /> Health Officer ' <br /> P <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) 0 Stockton, California 95201 <br /> (209) 468-3400 <br /> February 27, 1992 <br /> Tom Noma coo Tly <br /> 6507 E. Harney Lane <br /> Lodi, CA 95240 <br /> Re: DBCP in your Water Wells/ MS-91-97 <br /> A soil suitability study was submitted by Neil Anderson & Associates, in which a test for the <br /> chemical Dibromochloropropane (DBCP) was tested for and showed results of 1.36 ug/l in the <br /> agricultural well and 2.21 ug/l (parts per billion) in your domestic well. <br /> The State Department of Health Services adopted a standard of 0.2 parts per billion (ppb) for <br /> DBCP in public drinking water systems in 1989, however, private well owners are not legally <br /> required to meet this standard. As a precaution for yourself and family, we would suggest that <br /> you have the domestic well tested annually to verify if the above decribed chemical raises above <br /> state drinking standards. <br /> If your private and/or agricultural well analysis for Dibromochloropropane (DBCP) exceeded <br /> the State standard of 0.2 ppb, the following alternatives are being provided for your guidance: <br /> 1. As a temporary measure, it is recommended that bottled drinking water to be <br /> used. <br /> 2. In cases where exposure may continue indefinitely, such as with contaminated <br /> private wells, installation of a water treatment device, such as a carbon filter, <br /> may be advisable. However, using bottled water or installing a water treatment <br /> device at the kitchen water tap, will not stop exposure to DBCP if it is in your <br /> private water supply. Most treatment units sold for home installation only treat <br /> water at the point of use, such as the kitchen faucet, and do not prevent exposure <br /> through skin contact, bathing or inhalation. As a result, point of entry filters, <br /> which treat water for the entire house, are recommended because they remove all <br /> potential sources of exposure. The "granular activated carbon" filter is the <br /> recommended water treatment device in this case. It operates by passing the well <br /> water through a charcoal bed, thereby absorbing the DBCP contaminant. Water <br /> treatment equipment suppliers and installers are listed in your phone directory <br /> yellow pages under "Water Filtration & Purification Equipment." <br /> 3. A replacement well is also an alternative for providing uncontaminated water. <br /> A Division of San Joaquin Counry Health Care Scrvices 0 <br />