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6, <br /> L March 22,2005 <br /> NOA Project Number: E04132A <br /> 4.0 GROUND WATER INFORMATION <br /> 4.1 Ground Water Depth and Gradient <br /> LThe 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 lies between 80 and 100 feet below ground <br /> surface and flows at a gradient of two to ten feet per mile to the northeast in the vicinity of the Site. <br /> LNo ground water was encountered by the staff of Neil O. Anderson&Associates, Inc. during the <br /> drilling of two percolation test holes to a depth of 3 feet on March 20, 2005,one percolation test <br /> hole to a depth of 23 feet on February 1, 2005 and one percolation test hole to a depth of 21 feet on <br /> March 17, 2005. <br /> 4.2 On Site Well Permit History <br /> Four permits were found on file with EHD for the address of 8868 East Mariposa Road during <br /> Lreview on November 19,2004. No permits were found on file for the address of 8998 East <br /> Mariposa Road during review. <br /> L Table 3. <br /> On Site Well Permit History. <br /> Address,Date Use Comments <br /> 8868 E.Mariposa Road,9-11-74 Domestic/Private Repair of the pump <br /> 8868 E.Mariposa Road,11-19-73 Irrigation Repair of the pump <br /> i <br /> 8868 E.Mariposa Road,11-3-76 Domestic/Private New installation <br /> 8868 E.Mariposa Road,6-23-76 Irrigation Repair of the pump <br /> 4.3 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. Potential ground-water contamination can occur from a number of sources <br /> L which often include leaky underground storage tanks, agricultural activities, dairies,septic systems, <br /> and storm water infiltration. Any agricultural activities, dairies and the use of septic systems in the <br /> area should be considered potential ground-water contamination sources. <br /> L <br /> L <br /> L 5 <br /> "44L <br />