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May 5, 2005 <br /> NOA Project Number: E05057A <br /> Table 3. <br /> On-site Well Permit History. <br /> Date Comments <br /> 12/28/1987 Replacement of well for domestic use <br /> 8/4/1995 New Domestic well F <br /> A water sample was taken from the pipe manifold near the well head by the house on April 12, 2005 <br /> by Mr. Conor McGee of our office (Plate 1). <br /> 4.4 Water Sample Constituents <br /> .� The water sample was analyzed for nitrate and DBCP. Both DBCP and Nitrate were not detected <br /> in the water sample. The analytical reports prepared by Precision Enviro-Tech can be found in the <br /> appendix of this report. <br /> Though not detected in the water sample, the presence of nitrates are not uncommon in shallow <br /> ground water aquifers in San Joaquin County and other parts of the Central Valley. Nitrate in <br /> ,r ground water occurs as a result of the application of fertilizers,livestock waste,and untreated septic <br /> tank waste. Nitrate is mobile and often accumulates in the shallow ground water zones. <br /> �. In the early 1900s, natural levels of nitrate in ground water were measured in forty-three (43) wells <br /> throughout the Sacramento Valley by Bryan (1923). 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"natural' <br /> conditions,ground water concentration containing nitrate is no more then about 13.5 mg/L-NO3 (3 <br /> mg/L-N). Areas having 24.75 mg/L-NO3 (5.5 mg/L-N) or more are those in which nitrate <br /> concentrations may be increasing (Hull, 1984). <br /> Though DBCP was not detected in the water sample,DBCP is a nematocide and soil fumigant for <br /> vegetables and grapes. It is thought to cause health problems consisting of kidney damage,liver <br /> damage, and cancer.The use of DBCP was discontinued in 1979. The Environmental Protection <br /> Agency (EPA) set the maximum contaminant limit (MCL) at 0.2 parts per billion (ppb) because the <br /> EPA believes that given present technology and resources, this is the lowest level to which water <br /> systems can reasonably be required to remove this contaminant should it occur in drinking water. <br /> 4.5 Well Water Sample Collection,Handling, and Transportation <br /> The sample for nitrate was collected in a clean plastic container, the sample for DBCP was collected <br /> in two clean glass vials.The samples were then transported on ice and remanded under chain of <br /> ,y custody to Precision Enviro-Tech, Stockton. <br /> 6 <br /> Im <br />