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I <br /> L <br /> LJune 1, 2006 <br /> NOA Project Number. E05179A <br /> L 4.0 GROUND WATER INFORMATION V <br /> 4.1 Ground Water Depth and Gradient <br /> i <br /> LThe San Joaquin County Flood Control and Water Conservation istric (1998 and 1999) ground <br /> water depth and elevation maps were reviewed to determine the and ter levels near the Site. <br /> L The Fall 1998 and Spring 1999 maps are the most current offic ps ble from the County. <br /> According to these maps (Plates 3-6),ground water lies betwee 60 8 f et below ground <br /> surface and flows at a gradient of about 10 feet per mile to the no in vicinity of the Site. <br /> L �Noground water was encountered by the staff of Neil O.Anderson&Associates, Inc. during the <br /> 81 g three deep percolation test holes to a depth of 25 feet on May 11,2006. <br /> L4.2 Potential Ground Water Contamination Issues <br /> L 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 /> 2005). Please refer to this report for descriptions. Potential ground-water contamination can occur <br /> L from a number of sources which often include leaky underground storage tanks, agricultural <br /> activities,dairies, septic systems, and storm water infiltration. Agricultural activities, dairies and the <br /> L use of septic systems in the area should be considered potential ground-water contamination <br /> sources. <br /> C 4.3 Water Sample Location <br /> According to Mr. Dutra no wells exist on the subject prope . No well emiits were found for the <br /> Site during file review at EHD on January 15,2006. No well w er s le was taken for the subject <br /> Lproperty. <br /> L4.4 Water Sample Constituents <br /> ` No wells exists on the subject property. No well water sample was taken. / <br /> 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 Formation- <br /> weathered reddish gravel, sand,and silt forming clearly recognizable alluvial terraces and fans (Plate <br /> L <br /> L <br /> 4 <br /> L <br /> L '0044 <br /> I <br /> L <br />