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L L September 14, 2006 NOA Project Number: E06095A Lto the southwest of her house. One permit was found for a pump repair to an irrigation well. This permit has been included in (Plate 1) of this report. A water sample was taken by Ms. Nancy Rosulek on August 18, 2006 from the spigot on the eastern side of the residence on the northern portion of the property which comes from the domestic well on site. i 6. 4.4 Water Sample Constituents LThe water sample was analyzed for nitrate and DBCP. Nitrate was found at 18.3 mg/L-NO3,which is below the maximum contaminant level (MCL) set by the US EPA of 45 mg/I NO3. DBCP was not detected in the water sample. The analytical reports prepared by FGL Environmental can be Lfound in the appendix of this report. The presence of nitrates is not uncommon in shallow ground water aquifers in San Joaquin County and other parts of the Central Valley. Nitrate in ground water occurs as a result of the application of 61 fertilizers, livestock waste,and untreated septic tank waste. Nitrate is mobile and often accumulates in the shallow ground water zones. 6, In the early 1900s, natural levels of nitrate in ground water were measured in forty-three (43) wells throughout the Sacramento Valley by Bryan (1923). It was thought that ground water at that time L was dose to "natural' conditions. Based on the work by Bryan,it is estimated that under"natural' conditions,ground water concentration containing nitrate is no more then about 13.5 mg/L-NO3 (3 mg/L-N). Areas having 24.75 mg/L-NO3 (5.5 mg/L-N) or more are those in which nitrate concentrations may be increasing (Hull, 1984). tr DBCP was not detected in the water sample. DBCP is a nematocide and soil fumigant for vegetables and grapes. It is thought to cause health problems consisting of kidney damage,liver damage, and cancer. The use of DBCP was discontinued in 1979. The Environmental Protection Agency (EPA) set the maximum contaminant limit (MCL) at 0.2 parts per billion (ppb) because the L EPA believes that given present technology and resources, this is the lowest level to which water systems can reasonably be required to remove this contaminant should it occur in drinking water. L 4.5 Well Water Sample Collection,Handling, and Transportation The nitrate sample was collected in a sterile plastic container,the DBCP sample was collected in two sterile glass vials. The samples were then transported on ice and remained under chain of custody to FGL Environmental in Stockton. L 4.6 Chain of Custody 4 The Chain of Custody document has been included in the appendix of this report. 5 L 0AL