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January 7,2003 <br /> Job Numbeir-L602-025 <br /> Page 3 <br /> .- A 45 foot boring was drilled on the property by our office on May 9, 2002 as part of a separate <br /> geotechnical investigation for BES Concrete Products. The-Job Number is LG02-026 and the. <br /> report was dated May 20, 2002, The 45-foot deep geotechnical boring was located <br /> approximately 800 north of the percolation test borin s drilled for the Soil Suitability Report. <br /> pp y p g . <br /> No ground water was encountered in the 45 foot deep boring.. <br /> Our office understands that two water wells exist on the site•(Plate 1). The facility presentl .uses <br /> one 8-inch diameter well constructed in 1989 to'a depth of'l70 feet. A second idle water exists <br /> somewhere near the southeast confer of the property. No permits or detailed information was <br /> found regarding this well (Plate 1). <br /> The water quality,of the aquifer was tested by Fruit Growers Laboratory(FGL), Stockton, on <br /> June 25,2002. The well was'sami piled for,DBCP and Nitrates along-with other general mineral, . <br /> inorganic chemicals, and bacterial tests. _A copy of the results is attached in the appendix of this <br /> report. DBCP and nitrate are two common indicators of ground-water quality. <br /> r The result of the test indicates that DBCP was non-detectable'(ND) and nitrate as nitrogen,(N) <br /> -= was 3.3 mg/L-N (reported as 3300 ug/L-N).7he result of the nitrate test indicates the ground <br /> water is.well below the maximum contaminate level set by the United States Environmental <br /> Protection Agency of 10"mg/L as Nitrate N'or 10,000 ug/L-N. 'DBCP was not detected in the <br /> water sample. <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 groundwater occurs 8 a result <br /> of the application of fertilizers,'livestock waste, and untreated septic tank.waste. Nitrate is , <br /> a mobile and 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-2 It was thought that ground water,at that time <br /> was close to "natural" conditions. ;Based on the work by Bryan.,.it is estimated that under <br /> z Bryan,K:; 1923,Geology and ground-water resources of Sacramento Valley of California:U.S. <br /> Geological Survey Water-Supply Paper 495,285p: <br /> So <br /> O � <br /> G <br />