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June 8, 2006 <br /> NOA Project Number: E06036A <br /> 3.7 Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected on-site septic tank usage for each parcel would be for a primary residence and a <br /> secondary dwelling unit. System design should be based on the On-Site Wastewater Disposal Standards <br /> ` or other engineering recommendations. <br /> /4.0 GROUND WATER INFORMATION <br /> V4.1 Ground Water Depth and Gradient <br /> The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) ground <br /> water depth and 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 130 and 150 feet below ground <br /> surface and flows at a gradient of about 20 feet per mile down to the east in the vicinity of the Site. <br /> No ground water was encountered by the staff of Neil O. Anderson &Associates, Inc. during the <br /> drilling of 8 percolation test holes to a depth of three and a half feet, 10 feet, 15 feet and 25 feet on <br /> May 15, 2006. <br /> /4.2 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 /> which often include leaky underground storage tanks, agricultural activities, dairies, septic systems, <br /> and storm water infiltration. Agricultural activities, dairies and the use of septic systems in the area <br /> should be considered potential ground-water contamination sources. <br /> j,.4.3 Water Sample Location <br /> According to the tentative parcel map provided by John Shoup,Land Surveyor, no wells exist on the <br /> site. No well permits were found during file review at the EHD on May 8, 2006. No well water <br /> sample was taken. <br /> x'4.4 Water Sample Constituents <br /> No well exists on the site. No well water sample was collected or analyzed. <br /> �5-0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> The Site is depicted on the USGS Preliminary Geologic Map of the Bellota Quadrangle as within the <br /> 4 <br />