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i <br /> L <br /> November 21,2006 <br /> NOA Project Number: E06044B <br /> 4.0 GROUND WATER INFORMATION <br /> 4.1 Ground Water Depth and Gradient <br /> The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) ground <br /> water depth and elevatio ps w e reviewed to determine the ground water levels near the Site. <br /> The Fall 1998 and Spring 1999 maps Are the most current offit6O <br /> ps av bile from the County. <br /> According to these maps (plates 3-6),ground water lies betwee and80 fe t below ground <br /> surface and flows at a graabout 10 feet per mile to the nthe bel <br /> of the Site. <br /> No ground water was encountered by the staff of Neil O.Anderson &Associates, Inc. during the <br /> drilling three deep percolation test holes to a depth of 25 feet on October 26,2006. <br /> ` 4.2 Potential Ground Water Contamination Issues <br /> ` Identifying potential d-w ter contamination sources was not part of the scope of work for the <br /> soil suitability study. Surface d Subsurface Contamination Report addressed this issue (NOA, <br /> 2005). Please refer to ' report or descriptions. Potential ground-water contamination can occur <br /> Lfrom a number of sources often include leaky underground storage tanks, agricultural <br /> activities,dairies, septic systems,and storm water infiltration. Agricultural activities, dairies and the <br /> use of septic systems in the area should be considered potential ground-water contamination <br /> p sources. <br /> Water Sample Location <br /> o wells exist on the subject property. No well permits were found for the Site during file review at <br /> MtD_ou September 16,2006. No well water sample was taken for the subject property. <br /> ` 4.4 Water Sample Constituenls_ <br /> exists L � on the subject property. Nowell water sample was taken. <br /> - <br /> Now e <br /> h 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> The Site is depicted on the USGS Preliminary Geologic Map of San Francisco-San Jose <br /> Quadrangle as within the Quaternary Riverbank Formation. Quaternary Riverbank Formati - <br /> rweathered reddish gravel, sand, and silt forming clearly recognizable alluvial terraces and fat�(Plate <br /> 7 _. <br /> L <br /> 4 <br />