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July 17,2002 <br /> Job Number: LG02-136 <br /> Page 5 <br /> Table 3 Continued. <br /> Summary of Available Ground Water Information. <br /> Date,Source Groundwater Depth Notes <br /> Fall 1998,San Joaquin County Flood 100 feet. Gradient: Approximately 7.7 feet/mile <br /> Control and Water Conservation District flowing southeast. <br /> map.t Plates 2 and 4. <br /> Spring 1999, San Joaquin County 100 feet. Gradient:Approximately 11.1 feet/mile <br /> Flood Control and Water Conservation flowing southeast. <br /> District.t Plates 3 and 5. <br /> Note: ND=Non-Detectable(or not found at detectable limits). <br /> Two water samples from the on site wells were obtained by Jason Kort of our office on <br /> March 12, 2002. One water sample was obtained from the combined flow of the north and south <br /> wells and another sample was obtained from the domestic well. The water samples were <br /> _ delivered to Percision Enviro-Tec, Stockton,for analytical testing. Each of the samples was <br /> tested for total Kjeldah nitrogen(TKN), general mineral, and nitrate. The domestic well was <br /> tested for DBCP. The TKN and general mineral analysis was performed for purposes of the <br /> report of waste discharge report for the facility. The results of all the tests are attached to this <br /> report for additional ground-water information. <br /> The result of the analytical test indicates that DBCP was non-detectable (ND)and <br /> nitrate as nitrogen was found at 2,483 ug/L-N(or 2.4830 mg/L-N) for the domestic well. The <br /> result of the nitrate test indicates the ground water is well below the maximum contaminate level <br /> set by the United States Environmental Protection Agency of 10,000 ug/L as Nitrate N or 10 <br /> mg/L-N (also 45-mg/1-as NO,). The result of the nitrate test for the agricultural well water was <br /> found to be 3,679 ug/L-N (or 3.679 mg/]L-N). <br /> The presence of nitrates and DBCP are not uncommon in shallow ground-water aquifers <br /> in San Joaquin County and other parts of the Central Valley. Nitrate in ground water occurs as a <br /> result 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 /> S <br /> tll <br />