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GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> A N D A S S O C I A T E S INSPECTIONS a TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> December 27, 2007 <br /> Our Project Number: E07203A <br /> Lisa Medina <br /> San Joaquin County Environmental Health Deartment <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Subject: Water Sample <br /> 14645 East Tokay Colony Road <br /> Lodi, California <br /> APN: 065-270-02 <br /> Dear Lisa: <br /> The following pages present the results of water sampling at 14645 E. Tokay Colony Road. Our <br /> office previously completed a Soil Suitability Study for this property (report dated November 1, <br /> 2007). <br /> Water Sample Location <br /> One water sample was collected from the faucet by the domestic well on October 9, 2007 by 33� <br /> Jessen Welch of NOA. <br /> Water Sample Constituents <br /> The water sample was analyzed for nitrate and DBCP. DBCP was not detected. Nitrate was KZ_1 <br /> found to be 3.4 mg/L; the maximum contamination level (MCL) is 45mg/L. The analytical <br /> reports prepared by FGL Environmental are attached to this letter. <br /> The presence of nitrates is not uncommon in shallow ground water aquifers in San Joaquin <br /> County and other parts of the Central Valley. Nitrate in ground water occurs as a result of the <br /> application of fertilizers, livestock waste, and untreated septic tank waste. Nitrate is mobile and <br /> often accumulates in the shallow ground water zones. <br /> In the early 1900s, natural levels of nitrate in ground water were measured in forty-three (43) <br /> wells throughout the Sacramento Valley by Bryan (1923). It was thought that ground water at <br /> that time was close to "natural" conditions. Based on the work by Bryan, it is estimated that <br /> under"natural" conditions, ground water concentration containing nitrate is no more then about <br /> 13.5 mg/L-NO3 (3 mg/L-N). Areas having 24.75 mg/L-NO3 (5.5 mg/L-N) or more are those in <br /> which nitrate concentrations may be increasing (Hull, 1984). <br /> ANGELS CAMP • LODI MODESTO RENO • SACRAMENTO • WALNUT CREEK <br /> L 0 D 1 902 Industrial Way Lodi,CA 95240 209.367.3701 • FAX 209-369.4228 • www.noanderson.com <br />