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tr <br /> November 27,2006 <br /> NOA Project Number: E06115A <br /> surface in the vicinity of the Site. The gradient of the groundwater in the immediate vicinity of the ? <br /> site is undetermined. <br /> Groundwater was encountered at approximately 12.5 feet below ground surface by the staff of Neil <br /> O.Anderson&Associates, Inc. during the drilling of a groundwater boring on September 12,2006 <br /> near the proposed picnic area which is located near the southern portion of the property. The level (yJ <br /> of groundwater was found to be approximately 2.8 feet below ground surface near the center of the <br /> �" property on October 25, 2006. <br /> 4.2 Potential Ground Water Contamination Issues <br /> Identifying potential ground-water contamination sources was not part of the scope of work for the <br /> soil suitability study. <br /> 4 Potential ground-water contamination can occur from a number of sources which often include <br /> leaky underground storage tanks,agricultural activities,dairies, septic systems,and storm water � 9f <br /> infiltration. Any past agricultural activities and the present use of septic systems in the area should <br /> be considered potential ground-water contamination sources. <br /> 4.3 Water Sample Location <br /> Three well permits were found for the subject property address during file review at EHD on <br /> September 16,2 was issued to Whiskey Slough Harbor on June 15, 1979 for the <br /> installation o a domestic w e second permit was issued to the Whiskey Slough Harbor in May <br /> of 1990 for a p pair. In April of 2000 the pump was repaired again. One well appears to exist l <br /> 6' on the site. y�, <br /> I A water sample was taken from a faucet near the well on September 11, 2006 by Mr.Jessen Welch <br /> of our office (Plate 1). <br /> 4.4 Water Sample Constituents <br /> The water sample was analyzed for nitrate and DBCP. Neither Nitrate or DBCP were detected in <br /> the water sample. The analytical reports prepared by FGL Environmental can be found in the &'t- <br /> appendix of this report. <br /> The 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 /> in the shallow ground water zones. <br /> L <br /> 5 <br /> 6. '-*44 <br /> v <br />