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March 29,2001 <br /> Job Number: LGO1-031 <br /> Page 4 <br /> Table 2. <br /> Summary of Available Ground Water Information. <br /> Date,Description,Source Groundwater Depth Notes <br /> February 1,2001,one 17-foot,on-site soil No ground water found to <br /> boring,Neil O.Anderson&Associates, a total depth of 17 feet. <br /> Inc. <br /> November 28,2000,ground water sample Ground water depth not Nitrate: 3.3 mg/1-NO3 <br /> obtained from the existing domestic well, obtained from well. DBCP:Not Detected <br /> Neil O. Anderson&Associates,Inc. <br /> Fall 1998, San Joaquin County Ground About 127 feet in depth. Ground water gradient and flow <br /> Water Map.Plates 2 and 4. direction uncertain for area. <br /> Spring 1999, San Joaquin County Ground About 120 feet in depth. Ground water gradient and flow <br /> Water Map. Plates 3 and 5. direction uncertain for area. <br /> Probably flowing east or northeast. <br /> The existing on-site domestic water well is located near the northwest corner of the <br /> existing residence (Plate 1). A ground-water sample was collected from the well on February 2, <br /> 2001, and submitted to the FGL Environmental Laboratory for testing to detect the presence of <br /> dibromochloropropane (DBCP) and Nitrate (NO3) per County requirements. The test results <br /> indicated that DBCP was found to be non-detectable and nitrate as NO3 found to be 3.3 mg/L. <br /> The test results indicated the ground water sample analyzed was below the maximum <br /> 9- contaminate level set by the United States Environmental Protection Agency of 0.2ug/1 for <br /> DBCP and 45 mg/L as NO3. <br /> The presents 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 originates <br /> from agricultural fertilizers, livestock waste, and untreated septic tank waste. Nitrate is mobile <br /> and often accumulates in the shallow ground-water zones. In the early 1900's, natural levels of <br /> nitrate in ground water were measured in 43 wells throughout the Sacramento Valley by Bryan.' <br /> r_ It was thought that ground water at that time was close to "natural"conditions. Based on the <br /> work by Bryan, it is estimated that under natural conditions, groundwater concentration of nitrate <br /> is no more than about 3 mg/L-N (that's about 13.5 mg/L as NO3). Areas having 5.5 mg/L-N <br /> -' Bryan,K., 1923,Geology and ground-water resources of Sacramento Valley of California:U.S. <br /> Geological Survey Water-Supply Paper 495, 285p. <br /> -� ?pERSO <br /> r N <br /> Z r <br /> O � <br /> 7'tSOC♦ <br /> r <br />