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San Joaquin County 0::; .Cl Environmental Health Department DIRECTOR 2: r —1 .L Donna Heran,REHS Q, i� 600 East Main Street Stockton" California 95202-3029 PROGRAM COORDINATORS Robert McClellon,REHS Jeff Carruesco,REHS,RDI C9. �i F 6o,0, Website: www.sjgov.org/ehd Kasey Foley,REHS Phone: (209)468-3420 Fax: (209)464-0138 April 27, 2010 00 I y Thompson & Folger Co. PO Box 690067 Stockton, CA 95269 Subject: DBCP in your Water Well for PA-0800322 (MS) As part of the Minor Subdivision Approval process, water test results were submitted by Neil O. Anderson &Associates in which a sample taken August 28, 2009, was tested for the chemical Dibromochloropropane (DBCP) and showed results of 0.36 ug/L (parts per billion) in your domestic well at 5601 West Peltier Road, Lodi, CA. (Proposed Parcel #21). 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. 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: 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 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 bypassing 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."