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I GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> A N 'D A S S 0 C I A T 'E S INSPECTIONS & TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> March 15,2007 <br /> NOA Project Number:E07023A <br /> 10AR a b 2007 <br /> San Joaquin County Environmental Health Department ENViRt NM,,EN HEALTH <br /> 304 E. Weber Avenue PEF AIT/SERVICES <br /> Stockton, CA 95212 <br /> Re: Dave Silva Trucking SSS/NLS <br /> Water Sample Constituents <br /> Dear EHD, <br /> The following discussion concerns the water sample results from the well tested at 8853 South <br /> Manthey Road,French Camp, California on February 8, 2007 by Jessen Welch of our Neil O. <br /> Anderson&Associates. <br /> Water Sample Constituents <br /> The water sample was analyzed for nitrate and DBCP. DBCP was not detected in the water sample. <br /> Nitrate was found at 37.2 mg/L-NO.,which is below the maximum contaminant level (MCL) of 45 <br /> mg/L-NO3set by the United States EPA. The analytical reports prepared by FGL Environmental <br /> are attached. <br /> Well construction, seals, age and depth of the well screens may play significant part in assessing the <br /> levels of nitrate and DBCP in various aquifers.Without knowing specific details regarding well <br /> construction and condition,it would be difficult to accurately comment on the condition of the <br /> aquifer. Essentially,.the-water sample concentration approximately indicates the contaminant <br /> concentration level of the aquifer from which the well is drawing. It is Neil O. Anderson and <br /> Associates' opinion that,in general, near-surface aquifers are more likely to have elevated <br /> concentrations of nitrate and DBCP than the deeper aquifers. However the contaminant <br /> concentration of one aquifer cannot give any indication as to the concentrations of any other aquifer <br /> regardless of proximity. <br /> The presence of nitrates is not uncommon in shallow ground water aquifers in San Joaquin County <br /> and other parts of the Central Valley. Nitrate in ground water occurs as a result of the application of <br /> fertilizers, livestock waste, and untreated septic tank waste. Nitrate is mobile and often accumulates <br /> in the shallow ground water zones. <br /> y LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 ■209.367.3701 ■ 209.369.4228 fax 0 www.noanderson.com <br />