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August 15,2003 <br /> Job Number:LG03-221 <br /> Page 5 <br /> Table 2. <br /> Summary of Available Ground Water Information. <br /> Date,Source Groundwater Depth Notes <br /> _ July 2,2003,one(1)3-ft deep soil boring, No ground water Sandy soils encountered. <br /> Neil O.Anderson&Associates,Inc. encountered. <br /> Water sample from the on-site domestic Unknown. Water quality tests: <br /> water well. Depth unknown. Nitrate: 6 mg/L-NO3(or 1.3 mg/L-N) <br /> DBCP:not detected <br /> Fall 1998,San Joaquin County Flood About 29 feet. About 22.7 feet/mile flowing <br /> Control and Water Conservation District southeast. <br /> map. <br /> Spring 1999, San Joaquin County Flood About 26 feet. About 12.3 feet/mile flowing <br /> Control and Water Conservation District.' I southeast. <br /> Note:ND=Non-Detectable(or not found at detectable limits). <br /> A ground-water sample obtained from well W-1,was sampled on July 2, 2003 at 3:35 PM to test <br /> for the concentration of nitrate and DBCP (see Plate 1 for well location). The sample was <br /> collected from the closest water facet to the well by Mr. David Welch of our office using a <br /> plastic laboratory sampling container provided by the analytical laboratory. The sample was <br /> remanded to the Precision Environmental Laboratory, Stockton, on the same day, July 2, 2003. <br /> The test results indicated that nitrate was found at 6 mg/1-NO3 (or 1.3 mg/L-N). The result of the <br /> nitrate test indicates the ground water is well below the maximum contaminate level set by the <br /> United States Environmental Protection Agency of 45 mg/L as NO3 (or 10 mg/L-N). The result <br /> of the DBCP test was non-detectable. <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 1900's,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 a"natural"condition. Based on the work by Bryan, it is estimated that <br /> under natural conditions, ground-water concentration of nitrate is no more then about 13.5 NO3 <br /> ?pERSO <br /> t <br /> > .n <br /> O � <br /> �,TSpC♦ <br />