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L <br /> LFebruary 13,2007 <br /> NOA Project Number: E07010A <br /> Lshould be considered potential ground-water contamination sources. <br /> L4.3 Water Sample Location <br /> No permits were found for the well located on the property; however, the approximate location of a <br /> Lwell is marked on the 1982 septic permit <br /> 4.4 Water Sample Constituents <br /> L e water sample was analyzed for nitrate and DBCP. Nitrate was founOg/L-NO <br /> 03,which <br /> is below the maximum conta nt e (MCL) set by the US EPA ofBCP was <br /> detected in the water sample 0.05 ug/ which is below the maximuml (MCL) <br /> Lset by the US EPA of 0.2 ug/ Thea ytical reports prepared by FGL Environmental can be <br /> found in the appendix of this rep <br /> LThe presence of nitrates is not uncommon in shallow ground water aquifers in San Joaquin County <br /> and other parts of the Central Valley. Nitrate in ground water occurs as a result of the application of <br /> fertilizers,livestock waste, and untreated septic tank waste. Nitrate is mobile and often accumulates <br /> C in the shallow ground water zones. <br /> L 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/1,N) or more arc those in which nitrate <br /> concentrations may be increasing (Hull, 1984). <br /> L DBCP was detected in the water sample. DBCP is a nematocide and soil fumigant for vegetables <br /> and grapes. It is thought to cause health problems consisting of kidney damage,liver damage,and <br /> cancer. The use of DBCP was discontinued in 1979. The Environmental Protection Agency (EPA) <br /> set the maximum contaminant limit(MCL) at 0.2 parts per billion (ppb) because the EPA believes <br /> that given present technology and resources, this is the lowest level to which water systems can <br /> reasonably be required to remove this contaminant should it occur in drinking water. <br /> L4.5 Well Water Sample Collection,Handling, and Transportation <br /> L The nitrate sample was collected in a sterile plastic container,the DBCP sample was collected in two <br /> sterile glass vials. The samples were then transported on ice and remained under chain of custody to <br /> FGL Environmental in Stockton. <br /> L4.6 Chain of Custody <br /> LThe Chain of Custody document has been included in the appendix of this report. <br /> 5 <br /> L '-104 <br /> L <br />