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San Joaquin County DIRECTOR Environmental Health Department Donna Heran,REHS OPS C ASSISTANT DIRECTOR N „ E z{ 600 East Main Street Laurie Cotulla,REHS s Stockton, California 95202-3029 PROGRAM COORDINATORS •' Mike Huggins,REHS, RDI rr Margaret Lagorio, REHS Website: www.sjgov.org/ehd Robert McClellon, REHS �0�� Phone: (209)468-3420 Jeff Carruesco, REHS, RDI Fax: (209) 464-0138 Kasey Foley, REHS August 13, 2009 C(OPY Mike Stonum 16400 North Alpine Road Lodi, CA 95240 Subject: DBCP in your Water Well for PA-0900037 (SA) As part of the Soil Suitability/Nitrate Loading Study, water test results were submitted by FGL in which a sample taken June 25, 2009, was tested for the chemical Dibromochloropropane (DBCP) and showed results of 0.60 ug/L (parts per billion) in your domestic well at 16400 North Alpine Road, Lodi, California. The State Department of Health Services adopted a standard of 0.2 parts per billion (ppb) for DBCP in;public drinking 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 your domestic well tested annually to verify if the above-described chemical rises above state drinking standards. i If your private and/or agricultural well analysis for Dibromochloropropane exceeded the State standard of 0.2 ppb, the following alternatives are being provided for your guidance: I 1. As a-temporary measure, it is recommended that bottled drinking water be used if this well 4 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 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." I