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Jhalli Property Page 4 of 9 Our Project Number: LGS090502 March 18, 2009 4.3 Water Sample Location According to a tern ativ map provided by Quartaroli and Associates, I c., one do estic well exists on the site., No p rmits were found during a recent file review at EHD. A ell water sample was taken on larfuary 28, 2009 by Jessen Welch of our office from a do stic well on the site. 4.4 Water Sample Constituents The w r sa le was analyzed for nitrate and DBCP. Nitrate was found at 42.4 m L-NO3 which i b he maximum contaminant level (MCL):set by the United States Envir mental Protecti _ Age of 45 mg/L-NO3. DBCP was detected in the well water sample at.38 ug/L, which is(a e th MCL set by the United States Environmental Protection Agency for DBCP of 0.2 ug/. The presence of nitrates is not uncommon in shallow groundwater aquifers in San Joaquin County and other parts of the Central Valley. Nitrate in groundwater occurs as a result of the application of fertilizers, livestock waste, and untreated septic tank waste. Nitrate is mobile and often accumulates in the shallow groundwater zones. In the early 1900s, natural levels of nitrate in groundwater were measured in forty-three (43) wells throughout the Sacramento Valley by Kirk Bryan (1923). It was thought that groundwater at that time was close to "natural" conditions. Based on the work by Bryan, it is estimated that under "natural" conditions, groundwater 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 concentrati s-rxlay� increasing (Hull, 19844). As indicated, bBCP was detected in theQiWell water samplC at 0.38 ug/L, hich is above the MCL �i set by the United States Env_irontt9ental Protection Agency for DBCP of 0.2 ug/. DBCP is a nematocide and sal--fit3rFigant for vegetables and grapes It i hought 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 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. 4.5 Well Water Sample Collection, Handling, and Transportation The sample for nitrate was collected in a sterile plastic container; the sample for DBCP wasi collected in two sterile glass vials. The samples were then transported on ice and remanded under chain of custody to FGL Environmental, Stockton. 4.6 Chain of Custody The Chain of Custody documentation has been included in�the appendix 'of this report. 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02008 Neil O.Anderson&Associates,Inc