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aqua science <br /> AW• <br /> -- . May engineers Inc. <br /> April 20, 2001 <br /> Mr and Mrs Rossi -, <br /> 495 Aiiport Way <br /> Manteca, CA 95337 ' <br /> SUBJECT WATER WELL SAMPLING RESULTS <br /> 495 and 511 Airport Way <br /> Manteca, CA 95337 <br /> Dear Mr And Mrs Rossi <br /> On March 13, 2001, Aqua Science Engineers, Inc (ASE) collected <br /> groundwater samples from the wells located on your property at 495 a n d <br /> 511 Airport Way in Manteca, California The samples were submitted to <br /> Kiff Analytical Laboratory in Davis, California for analysis <br /> Water samples collected from your well located at 495 Airport Way <br /> contained 060 parts per billion (ppb) 1,2-dlchloroethane (1,2-DCA) and <br /> 12 ppb 1,2-dichloropropane (1,2-DCP) The California Department of <br /> Health Services (DHS) has established a maximum contaminant level <br /> (MCL) for 1,2-DCA in drinking water of 0 5 ppb and a MCL for 1,2-DCP 1 n <br /> drinking water of 5 0 ppb The 1,2-DCA concentration detected in the <br /> water sample collected exceeded the DHS MCL for drinking water Please <br /> continue to use the alternative water supplied to you for this property <br /> until further notice <br /> Water samples collected from your well located at 511 Airport Way <br /> contained 190 ppb methanol However, methanol is a common <br /> laboratory contaminant because it is used to clean sample vials a n d <br /> various laboratory equipment The USEPA integrated risk information <br /> system (IRIS) reference dose as a drinking water level for methanol is <br /> 3,500 ppb The methanol concentration detected in the water sample did <br /> not exceed this drinking water level <br /> Is <br /> 208 W Fl Pintado, Danville, California 94526 • 925-820-9391 • Fax 925-837-4853 <br />