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GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> AN D ASSOCIATES INSPECTIONS 6 TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> 7-1iN 510N DESIGN <br /> December 7, 2007 <br /> NOA Project Number:E071436 <br /> DEC 1 0 2007 <br /> ENVIRONMENT HEALTH <br /> San Joaquin County Environmental Health Department PERMIT/SERVICES <br /> 600 East Main Street <br /> Stockton, CA_952J2 <br /> Re:, Well Water Sample Constituents <br /> Trinkle Property <br /> 24583 & 25001 South Kass oad <br /> Tracy, California <br /> Dear Mr. Trinkle, <br /> The following discussion concerns the water sample constituent results from the well tested at the <br /> address 24583 and 25001 South Kasson Road, Tracy, California. The well water sample was taken <br /> from the faucet of the building on site by Mr. Jessen Welch of our office on November 12, 2007. <br /> Water Sample Constituents <br /> The water sam le was an yzed for nitrate aid DBCP. reanalytic <br /> was t detected in the water <br /> sample.. ate was n oat 33.5 mg/L-NO3, which iselow th maximum contaminant level <br /> (MCL) of 45 mg/L-NO by the United States EPA. T eports prepared by FGL <br /> Environmental areaftacheti. -- <br /> Well construction, seals, age and depth of the well screens may play significant part in assessing <br /> the 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 <br /> aquifer 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 <br /> of fertilizers, livestock waste, and untreated septic tank waste. Nitrate is mobile and often <br /> accumulates in the shallow ground water zones. <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,I.odi,California 95240 ■209.367.3701 0 209.369.4228 fax 0 w .noandcrsonsom <br />