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January 14,2003 <br /> Job Number: LG02-460 <br /> Page 3 <br /> Table 1. <br /> Summary of Available Ground Water Information. <br /> Date,Source Groundwater Depth Notes <br /> November 14,2002,a 10-ft deep soil boring Not encountered. No ground water encountered to a <br /> was drilled on each parcel,Neil O.Anderson depth of 10 feet. <br /> &Associates,Inc. <br /> December 17,2002,water sample collected Unknown. Water quality test for nitrate: <br /> from a neighboring domestic water well 9 mg/L-NO,(or 2.0 mg/L-N) <br /> located at 20034 South Naglee Road. I Water quality test for DBCP-ND. <br /> Note:ND=Non-detectable(not found at detectable limits). <br /> ` A ground-water sample was obtained from a neighboring water well located at 20034 Naglee <br /> Road, on December 17, 2002 by a representative of our office. The water samples were sent to <br /> Precision Environmental Laboratory, Stockton, for testing on the same day. The samples were <br /> r, tested for the presence of dibromochloropropane(DBCP) and Nitrate(NO3). The water sample <br /> obtained from the well may be an indicator of local drinking water quality. The depth and screen <br /> interval for the well is not known. <br /> The test results indicated that DBCP was non-detectable (ND) and nitrate was found at 9 <br /> mg/L.-NO3(2 mg/L-N). The result of the nitrate test indicates the ground water is below the <br /> maximum contaminate level set by the United States Environmental Protection Agency of 45 <br /> mg/L as NO3 00 mg/L-N). <br /> The presence of nitrates and DBCP are not uncommon in shallow ground-water aquifers in San <br /> Joaquin County and other parts of the Central Valley. Nitrate in ground water occurs as a result <br /> of the application of fertilizers,livestock waste, and untreated septic tank waste. Nitrate is <br /> mobile and 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 wells <br /> throughout the Sacramento Valley by Bryan? It was thought that ground water at that time was <br /> close to a"natural"condition. Based on the work by Bryan, it is estimated that under natural <br /> conditions,the ground-water concentration of nitrate is no more then about 13.5 NO3 (3 mg/L- <br /> 2 Bryan,K, 1923,Geology and ground-water resources of Sacramento Valley of California:U.S. <br /> Geological Survey Water-Supply Paper 495,285p. <br /> pER30 <br /> � 4 <br /> O <br /> SSS OES' <br />