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January 23,:2001 <br /> Job Number:LG00-336. <br /> Page 4 <br /> Table 2. . <br /> Summary of-Available.Ground Water Information. <br /> Date Descri do <br /> p n,Source Groundwater Depth - Notes <br /> November 2.,2000,'one 10-foot deep on-. No ground water found to a total <br /> site soil boring,Neil O.Anderson& depth of 10 feet <br /> Associates,Inc:' <br /> November 28,2000,ground water sample Ground water depth not obtained Nitrate: 12.9'mg/1-NO3 <br /> obtained from the existing domestic well, from well.: DBCP:Not Detected <br /> Neil 0.Anderson&Associates,Inc. <br /> Spring 1998, San Joaquin County Ground. About 130 feet in depth. Gradient about 5.5 ft/mi, <br /> _ Water Map. flowing northwest. <br /> Fall 1998, San Joaquin County Ground About 130 feet in depth. Gradient about 3.3 ft/mi, <br /> Water Map. flowing northwest. <br /> The existing'on-site domestic water well is located near the northwest corner of the " <br /> existing residence. A ground-water sample was collected from the well on November 28, 2000 <br /> 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 NO i3 found to be 12.9 mg/L. <br /> Both tests indicated the ground water sample was below the maximum contaminate level set by <br /> FL the United States Environmental Protection Agency of 0.2ug/l for.DBCP and 45 mg/L as NO3 (or <br /> 10 mg/L-N). <br /> I' 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 melts throughout the Sacramento Valley by Bryan.2 ," <br /> r It was thought that ground water at that time was close to "natural"conditions. Based-on the <br /> ra work by'Bryan it is estimated that under natural conditions, groundwater-concentration of nitrate <br /> is no.more then about 3 mg/L-NO3. Areas having 5.5 mg/L-NO3 or more are those in which <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 /> F <br />