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March 26,2003 <br /> Job Number:LG02-031 <br /> Page 3 <br /> r <br /> Table 1. <br /> Summary of available ground water information. <br /> Date,Source Groundwater Depth Notes <br /> Five(5)3-foot deep percolation test Not encountered No ground water encountered to a <br /> _ borings. Neil 0.Anderson& depth of 3-feet. <br /> Associates,Inc.October 23,2002. <br /> Two(2)40-foot deep geotechnical 29.5 feet <br /> borings(B-1 and B-2),February 11, <br /> 2003. <br /> r <br /> Water sample obtained on February 11, Unknown Water quality test Nitrate- 14 mg/L <br /> 2003 from 41 foot deep geotechnical as N.Water quality test DBCP-ND. <br /> boring. <br /> Fall 1998, San Joaquin County Flood Approximately 25 feet. Gradient is 11.4 ft/mile north. <br /> Control and Water Conservation District <br /> map.' Plates 2 and 4. <br /> Spring 1999, San Joaquin County Approximately 25 feet. Gradient is 9.4 f Ymile north. <br /> Flood Control and Water Conservation <br /> District.'Plates 3 and 5. <br /> Note: ND=Non-Detectable(or not found at detectable limits} <br /> -- The nitrate and DBCP concentration of the shallow aquifer was sampled in the deep geotechnical <br /> boring B-1 on February 11, 2003 (Plate 1). The geotechncial investigation for the subject project <br /> was completed by our office and issued in a separate report dated March 21, 2003. The depth to <br /> ground water in the boring was measured at 29.5 feet below the ground surface. The water <br /> sample was pulled from the open boring with a sampler tool and later taken to Precision <br /> EnviroTec Laboratory on February 11, 2003 for testing of DBCP and nitrate. <br /> The result of the ground water test indicates that DBCP was non-detectable (ND) and nitrate as <br /> Nitrogen(l) was 14 mg/L. The result of the nitrate test indicates the ground water is above the <br /> maximum contaminate level set by the United States Environmental Protection Agency of 10 <br /> mg/L as Nitrate 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 /> rp[RSO <br /> � 4 <br /> [aa � <br /> Z <br /> p 'A <br /> X15 O C\ <br />