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GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> AND ASSOC IATES INSPECTIONS a TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> April 11,2007 <br /> NOA Project Number:E07045A <br /> San Joaquin County Environmental Health Department <br /> 304 E.Weber Avenue <br /> Stockton,CA 95212 <br /> I P r: <br /> Re: St.Jorge Winery SSS/NLS <br /> Water Sample Constituents <br /> Dear EHD, <br /> The following discussion concerns the water sample constituent results from the well tested at St. <br /> Jorge Winery,located at 151 West Taddei Road,Acampo. <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 0.40 mg/L-NO3,which is well below the maximum contaminant level (MCL) <br /> of 45 mg/L-NO3 set by the United States EPA.The analytical reports prepared by FGL <br /> Environmental 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 /> LODI ■ SACRAMENTO IN MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,Califomia 95240 ■209.367.3701 0 209.369.4228 fax ■w .nwndersonxom <br />