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- r <br /> Fi <br /> `March 17, 2005 <br /> NOA Project Number:-E05008A <br /> 01' <br /> 4.0 GROUND WATER INFORMATION <br /> 4.1 ._Ground Waterbepth and Gradient <br /> F1 <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 maps available_from the county.- <br /> Examination of these maps indicates that no water level data is available for the Tracy/Banta area, <br /> which includes the Site, and no definite comments"as to depth or gradient flow direction can be <br /> ` made. However, based on our experience in the.area, our office estimates that, at its shallowest, the <br /> _- - ground water in the area lies .10 to 15 feet'below the ground surface. <br /> Fili <br /> No ground water was encountered by the staff of Neil O.Anderson 8&Associates, Inc. during the- <br /> drilling of the percolation test holes io a depth of 3 feet on February 23, 2005. <br /> 4.2 Potential Grounda rContamination <br /> W to Issues <br /> Identifying potential ground-water contamination sources was not part of the scope of work for the <br /> soil suitability study. A Surface and Subsurface Contamination-Report addressed this issue (NOA, <br /> 2003). Please refer to this report for descriptions. <br /> _Potentialg round-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 <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 /> E ` <br /> 4.3 Water Sample Location <br /> j <br /> No permits were found for the subject property address of 25122 South Banta Road. <br /> A water sample was taken from the pipe manifold near the well head in the middle of the property <br /> F1 on March 1, 2005 (Plate 1). <br /> 4.4 Water Sample Constituents <br /> The water sample was analyzed for nitrate and DBCP. BothNitrate�CPa4were not detected <br /> in the water samples. The analytical reports prepared by Precision Enviro-Tech can be found in the <br /> appendix of this report. <br /> L + <br /> i <br /> 5 <br /> - <br />