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PUBLIC hEALTH SERVICES SAN JOAQUIN COUNTY ENVIRONMENTAL HEALTH DIVISION Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 (209) 468-3420 June 23, 1994 Rudy Maggio 21343 N. DeVries Road Lodi, CA 95242 Re: DBCP in your Water Wells/NN-94-06, 24301 N. DeVries Road A soil suitability study was submitted by Baumbach & Piazza, Inc., in which a test for the chemical Dibromochloropropane (DBCP) was tested for and showed results of .73 mg/L (parts per million) in your irrigation well. The State Department of Health Services adopted a standard of 0.2 parts per billion (ppb) for DBCP in public dunking water systems in 1989, 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 the domestic well tested annually to verify if the above described chemical raises above state drinldng standards. If your private and/or agricultural well analysis for Dibromochloropropane (DBCP) exceeded the State standard of 0.2 ppb, the following alternatives are being provided for your guidance: 1. As a temporary measure, it is recommended that bottled drinking water to be used. 2. In cases where exposure may continue indefinitely, such as with contaminated private wells, installation of a water treatment device, such as a carbon filter, may be advisable. However, using bottled water or installing a water treatment device at the kitchen water tap, will not stop exposure to DBCP 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, 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 "granular activated carbon" filter is the recommended water treatment device in this case. It operates by passing the well water through a charcoal bed, thereby absorbing the DBCP contaminant. Water treatment equipment suppliers and installers are listed in your phone directory yellow pages under "Water Filtration & Purification Equipment." A Di.ision of San Joaquin County Health Care Service.