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DDDNDD �' <br /> GEOTECHNICAL <br /> NEIL O. ANDERSON RNVIRONMENTAL <br /> DEC 1 0 20084*4 <br /> A N D A S SCI C I A T E S INSPECTIONS & TESTING <br /> ENVIRONMENT HEALTH LABORATORY SERVICES <br /> PERMIT/SERVICES POOL ENGINEERING <br /> POST TENSION DESIGN <br /> December 8, 2008 <br /> NOA Project Number: LGS080544 <br /> Rodney Estrada <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95212 <br /> Re: Well Water Sample Constituents <br /> Scannavino Property <br /> 3650 North Overhiser Road <br /> Stockton, California <br /> Dear Rodney, <br /> The following discussion concerns the water sample constituent results from the well tested at the <br /> address 3650 North Overhiser Road in Stockton, California. The well water sample was taken from <br /> the spigot of the domestic well on site by Mr. Jessen Welch of our office on November 3, 2008. <br /> Water Sample Constituents <br /> The water sample was analyzed for nitrate and DBCP. DBCP was detected in the water sample at <br /> 0.01 ug/L, which is below the maximum contaminant level (MCL) of 0.2 ug/L set by the United <br /> States EPA. Nitrate was found at 95 mg/L-NO3, which is above the MCL of 45 mg/L-NO3 set by the <br /> United States EPA. The analytical reports prepared by FGL Environmental are attached. <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 /> ANGELS CAMP • LODI MODESTO RENO • SACRAMENTO • WALNUT CREEK <br /> LODI 902 Industrial Way • Lodi.CA 95240 • 209.367.3701 • FAX 209-369.4228 • www.noonder;on.com <br />