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April 1,2005 <br /> NOA Project Number: E05034A <br /> FI4.0 GROUND WATER INFORMATION <br /> /4.I Ground Water Depth and Gradient <br /> FI <br /> .The San Joaquin County Flood Control and Water Conservation_District (1998 and 1999) ground <br /> water depth and elevation maps were reviewed to-determine the ground water levels near the Site. <br /> The Fall 1998 and Spring 1999 maps are the most current official maps available_-from-the�County. <br /> According to these maps (Plates 3-6),ground water;he-s lae X30 and 140 feet below ground <br /> surface and flows at a gradient of about 5 feet per mile to the wes uife~33 e <br /> +/No.ground water was encountered b the staff of Neil O.Anderson&Associates, Inc. during the <br /> � _ . Y g <br /> drilling of one percolation test hole to a depth of three feet on lVMarclJ 8 2005. <br /> f 4:2 "Potential Ground-Water Contamination Issues <br /> F1Identifying potential ground-water contamination sources was not part of the scope of work for the <br /> soil suitability study. Potential ground-water contamination can occur froma number of sources <br /> which often include leaky underground storage tanks, agricultural activities, dairies, septic systems, <br /> and storm water infiltration. ,Agricultural-activities and the use-of septic systems in the area should <br /> be considered potential ground-water contamination sources. <br /> .X4:3 Water Sample Location <br /> One well exists on the site. No well permits were found during file review at EHD on March 7, <br />' 2005.A water sample'was taken from the well head of the domestic well by Mr. Conor McGee of <br /> our office on March 18, 2005- <br /> '--"4.4 Water Sample.Constituents <br /> The water sample was analyzed for nitrate and DBCP. _Nitrate and DBCP were both not detected in <br /> the water sample. The analytical reports prepared by Precision_ Enviro-Tech can be found in the <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 <br /> of fertilizers,livestock waste, and untreated septic tank waste. Nitrate is mobile and often <br /> F1accumulates in the shallow ground water zones. <br /> Fi <br /> 5 <br /> F <br />