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L LMarch 27,2006 NOA Project Number: E05144B Lcurrently in use on the property. He stated that an industrial well is used for irrigating the vineyards./ V/The EHD well permit files were searched on November 1, 2005 in an effort to obtain copies of Lpermits for any water wells on the subject property; several permits were found. A permit for a replacement pump for an industrial well on the subject site was issued on September 28, 1984. A permit to replace the agricultural well pump in APN 023-110-08&09 was obtained on August 27, L1984. �(,A eWpK' r�a�r t,,•rf , water sample was taken from kaucefed by the domestic well car the residence at 20899 Eas6t'4� LState Highway 12 on the west side of trii residence by Ms. Nancy Rosulek on March 15,2006. /,2-gi��*—e /�P�iwt2si A4.4 Water Sample Constituents ` The water sample was analyzed for nitrate and DBCP. Nitrate was found at .6 mg/L-NO3, elow the maximum contaminant level (MCL) set by the US EPA of 45 mg/L-NO3. was t Ldetected in the water sample. The analytical reports prepared by FGL Environmental can be found in the appen of this report. VMc presence of nitrates is not uncommon in shallow ground water aquifers in San Joaquin County 6' and other parts of the Central Valley. Nitrate in ground water 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 ground water zones. ✓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 was close to "natural' conditions. Based on the work by Bryan, it is estimated that under"natural' conditions,ground water concentration containing nitrate has a concentration of no greater then j 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). [IDBCP 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 L 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. L /.5 Well Water Sample Collection, Handling, and Transportation The samples were collected in a sterile plastic container and two sterile glass vials. The samples were L then transported on ice and remained under chain of custody to FGL Environmental, Stockton. 5 6. '004 L