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Q.U�N <br /> ENVIRONMENTAL HEALTH EPARTMENT <br /> SAN JOAQUIN COUNT' <br /> Unit Supervisors <br /> Donna K.Heran,R.E:H.S. k <br /> 304 East Weber Avenue. Third Floor Carl Borarnan,R.E.H.S. <br /> Director Mike Huggins. R.E.H.S., R.D.I. <br /> � Al Olsen,R.E.H.S. Stockton, Ca]ltOiZlla 95202-2708 Dou Tlas W. Wilson. R.E.H.S. <br /> C,46�_ Program iWanager Telephone: (-'09) 468-3420 <br /> Mar�area Lagorio. R.E.H.S.4�' o R Laurie A.Cotulla,R.E.H.S. Robert McClellon. R.E.H.S. <br /> Program rllarne�c <br /> j,r Fax: (209 16�-0138 Mark Barcellos. R.E.H.S. <br /> r May 12, 2005 <br /> Theodore and Arvene Edwards, TR <br /> 23544 S. Banta Road <br /> Tracy, CA 95376 <br /> RE: DBCP in your Water Well for PA-0400045 (itlinor Subdivision) <br /> e <br /> As'part of the subdivision approval process, water test results (per our condition B) were <br /> submitted by Neil Anderson & Associates, Inc. in which a sample taken December 14, 2004, was <br /> tested for the chemical Dibromochloropropane (DBCP) and showed results of 0.0823 ug/L (parts <br /> per billion) in your domestic well at 23544 South Banta Road, Tracy, California. <br />! Il <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 your domestic well tested annually to verify if the above-described chemical rises <br /> FrF� above state drinking standards. <br /> 3 <br /> i for Dibromochloro ro ane exceeded the State <br /> If your private and/or agricultural well analysis p p <br /> standard of 0.2 ppb, the following alternatives are being provided for your guidance: E <br /> q <br /> 1." As a temporary measure, it is recommended that bottled drinking water be used if this well is <br /> :1 supplying drinking water. <br /> 2.' In cases where exposure may continue indefinitely, such as with contaminated private wells, <br /> installation of a water treatment device, such as a filter, may be advisable. However, using <br /> bottled water or installing a water treatment device at the kitchen water tap, will not stop <br /> exposure to DBCP if it is in your private water supply. Most treatment units sold for home <br />' installation only treat water at theoinntt_o_f use, such as the kitchen faucet, and do not prevent <br /> exposure through skin contact, bathing or inhalation. As a result, point of entry filters, which <br /> treat water for the entire house, are recommended because they remove all potential sources <br /> of exposure. The "granular activated carbon" filter is the recommended water treatment <br /> device in this case. It operates by passing the well ,vatcr through a charcoal bed, thereby <br /> absorbing the DBCP contaminant. Water treatment equipment suppliers and installers are <br /> listed in your phone directory yellow pages under"Water Filtration & Purification <br /> Equipment." <br /> li <br />