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March-26,2003 <br /> Job Number:LG02•-031 <br /> Page 3 <br /> Table 1. <br />` f available round water information.' <br /> Summary o g <br /> Date,Source 'J Groundwater Depth. Notes <br />` One shallow and deep percolation test Not encountered No ground water encountered to a . <br /> E hole. Neil O.Anderson&Associates, depth of 25-feet. <br /> Inc.March 5,2003. <br /> Water sample obtained on March 4, Unknown - Water quality,test Nitrate-'77 mg/L <br /> 2003 from onsite water well. as NO3.Water quality test DBCP- <br /> ND. <br /> r Pall 1998,San Joaquin County Flood, Approximately 130 to 140 . Gradient is 5.6 ft/mile southwest. <br /> 3 <br /> control.and Water Conservation District. feet. <br /> map.l Plates 2 and 4. <br /> Spring.1999,. 'San Joaquin County Approximately 130 to 140 Gradient is 3.3 ft/mile;southwest'. <br /> G� Flood Control and Water Conservation feet. <br /> District.'Plates 3 and 5. <br /> Note:ND=Non-Detectable(or not found-at detectable limits) Y <br /> The nitrate and DBCP concentration of the ground water was sampled from a water spicket at the ' <br /> house on 1Viarch 4, 2003.. The water sample was taken to Precision EnviroTec Laboratoryon <br />. March 4; 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 (N)was 77 mgIL as NO. The result.of the nitrate,test indi6ates.the ground water is' <br /> above the maximum contaminate level set by the United States Environmental Protection <br /> Agency of 45.mg/L-as Nitrate N. , , <br /> The presence of nitrates and DBCP are not uncommon in,shallow ground-water aquifers,in San <br /> iw Joaquin.County and other parts of the Central Valley. Nitrate ' ground water occurs as a result <br /> of the application of fertilizers, livestock waste, and untreated septic tank waste.. Nitrate is <br /> mobile aril 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. It was thought that ground water at that time <br /> ,Bryan,K., i923,'Geology and ground-waterresources of Sacramento Valley of California:U.S. <br /> Surve .Water-S ly Paper 495, 285p. . <br /> 'Geological Y uPP <br /> P <br />