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ENVIRONMENTAL HEALTH DEPARTMENT PQU�N SAN JOAQUIN COUNTY ?� Donna K.Heran,R.E.H.S. Unit Supervisors U), ` ` Director 304 East Weber Avenue. Third Floor Carl Bor-man, R.E.H.S. Al Olsen,R.E.H.S. Stockton. California 95202-2708 Mike Huggins, R.E.H.S.. R.D.I. • Douglas W. Wilson, R.E.H.S. eq•, •.•�P Program Manager �iF Telephone: (209) 468-3420 Margaret La orio. R.E.H.S.Ra � Laurie A.Cotulla,R.E.H.S. � Robert McC ellon, R.E.H.S. Program Xfanager Fax: (_09) 464-0138 Mark Barcellos, R.E.H.S. December 20, 2004 FILE COPY Robert Longstreth, Longstreth Family Limited etal 25869 E. River Road Escalon, CA 95320 RE: DBCP in your Water Well for Minor Subdivision PA-04-255 As part of the Soil Suitability Study, water test results (per our condition C) were submitted by Don Chesney of Chesney Consulting in which a sample taken September 9, 2004, was tested for the chemical Dibromochloropropane (DBCP) and showed results of 3.2 ug/L (parts per billion) in your domestic well at 17336 East Sola Road, Stockton, 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. 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 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."