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GEOTECHNICAL <br /> NEIL O. ANDERSON <br /> ENVIRONMENTAL <br /> A N D A S S O C I A T E S INSPECTIONS & TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> 1 <br /> AUG 2(309 7 POST TENSION DESIGN <br /> August 5, 2009 ENVIRONMENT HEALTH <br /> NOA Project Number: LES090550 PER A T/SERVICES <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 /> Katzakian Property, APN: 089-160-19 <br /> 12133 Baker Road <br /> Stockton, California <br /> Dear Rodney, <br /> The following discussion concerns the water sample constituent results from the well tested at <br /> the address 12133 Baker Road in Stockton, California. The well water sample was taken from <br /> the spigot off the house on site by Mr. Jessen Welch of our office on June 23, 2009. <br /> Water Sample Constituents <br /> The water sample was analyzed for nitrate and DBCP. DBCP was detected in the water sample <br /> at 0.01 ug/L, which is below the maximum contaminant level (MCL) of 0.2 ug/L set by the <br /> United States EPA. Nitrate was found at 1.8 mg/L-NO3, which is below the MCL of 45 mg/L-NO3 <br /> set by the United States EPA. The analytical reports prepared by FGL Environmental are <br /> attached. <br /> Well construction, seals, age and depth of the well screens may play significant part in <br /> assessing the levels of nitrate and DBCP in various aquifers. Without knowing specific details <br /> regarding well construction and condition, it would be difficult to accurately comment on the <br /> condition of the aquifer. Essentially, the water sample concentration approximately indicates the <br /> contaminant concentration level of the aquifer from which the well is drawing. It is Neil 0. <br /> Anderson and Associates' opinion that, in general, near-surface aquifers are more likely to have <br /> elevated concentrations of nitrate and DBCP than the deeper aquifers. However, the <br /> contaminant concentration of one aquifer cannot give any indication as to the concentrations of <br /> any other aquifer regardless of proximity. <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 /> 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.cofn <br />