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r) C <br /> GEOTECHNICAL <br /> � NEIL O. ANDERSON I ENVIRONMENTAL <br /> F } A N D A S 5 0 C ! A T E S i INSPECTIONS & TESTING <br /> I <br /> ! LABORATORY SERVICES <br /> I <br /> POOL ENGINEERING <br /> I POST TENSION DESIGN <br /> March 15, 2007 <br /> NOA Project Number:E07023A <br /> E. <br /> San Joaquin County Environmental Health Department <br /> I 304 E. Weber Avenue <br /> Stockton, CA 95212 <br /> Re: Dave Silva Trucking SSS/NLS <br /> t Water Sample Constituents <br /> C 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 /> t <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-N031 which is below the maximum contaminant level (MCL) of 45 <br /> 1 mg/L-NO3 set by the United States EPA. The analytical reports prepared by FGL Environmental <br /> are attached. <br /> E <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 /> i 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 /> I,f� <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 ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 ■209.367.3701 ! 209.369.4228 fax ■www.noanderson.com <br /> 1 <br />