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Californi egional Water Quality Cou of Board <br /> (\� Central Valley Region z; 1 <br /> vRobert Schneider,Chair <br /> Arnold <br /> Linda S.Adams Sacramento Main Orrice <br /> Secretary for Schw negger <br /> 11020 Sun Center Drive tl200,Rancho Cordova,Califoma 9 5 670-61 14 Governor <br /> Environmental <br /> Protection Phone(916)464-3291 •FAX(916)464-4645 <br /> http://www.waterbouds.ca.gov/cen(ralvalley <br /> 24 July 24, 2006 RECE#VDD <br /> Nestle USA Inc. JUL 2 7 2006 <br /> Attention: Mr. Mike Desso ENVIRONMENT HEALTH <br /> 800 North Brand Boulevard MIT/SERVICES <br /> Glendale, California 91203 <br /> WATER SUPPLY WELLS AT RIPON CHRISTIAN SCHOOL, FORMER NESTLE USA, INC. <br /> FACILITY, RIPON, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) staff has reviewed the quarterly chemical analyses results on water samples <br /> collected for Nestle USA Inc. (Nestle) from two water supply wells located at Ripon Christian <br /> School, 435 North Maple, Ripon, California. <br /> The laboratory analyses for volatile organic compounds in water samples collected from the <br /> school's drinking water supply well (RC-1) on January 24, and April 27, 2006, both detected <br /> 1,1-dichloroethene (1,1-DCE) at a concentration of 0.16 micrograms per liter (µg/L). Also, the <br /> laboratory analysis conducted on January 24, 2006 on a water sample collected from the <br /> school's landscape irrigation well (RC-2) detected chloroform at a concentration of 0.25 µg/L. <br /> The compound 1,1-DCE can occur as an intermediate breakdown product of <br /> trichloroethylene (TCE). Although concentrations appear to be below action levels, the <br /> detections may indicate the arrival in the intermediate aquifer zone of the volatile organic <br /> compound plume emanating from the former Nestle facility at Industrial Avenue. As you <br /> know, TCE is a constituent of concern in the plume. Currently, Nestle samples RC-1 <br /> quarterly and RC-2 semi-annually. Nestle should begin sampling both wells on a monthly <br /> basis. <br /> If you have any questions, please contact me at (916) 464-4675, or by email at <br /> jbrownell@waterboards.ca.gov. <br /> James R. Brownell, P.G. <br /> Engineering Geologist <br /> cc's: <br /> Bill Finley, Superintendent, Ripon Christian School <br /> Margaret Lagorio, San Joaquin County Environmental Health Department <br /> John Walker, Stanislaus County Public Health Officer <br /> Sonya Harrigfeld, Stanislaus County Department of Environmental Resources, Modesto <br /> California Environmental Protection Agency <br /> 0d Recycled Paper <br />