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September 25,2006 <br /> NOA Project Number: E06102B <br /> Address,Date Tank Lines,Length,Pits Comments <br /> Capacity <br /> 25950 Thornton Road -- Addition of 75'x 9'faker bed Addition to Commercial <br /> 3-30-01 Facility <br /> 25930 North Thornton Road Addition of one,70'leach line Addition <br /> 8-14-87 <br /> 3.7 Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected usage would be for a single family residence and a secondary dwelling unit on <br /> each parcel. System design should be based on the On-Site Wastewater Disposal Standards or other <br /> engineering recommendations. <br /> 4.0 GROUND WATER INFORMATION <br /> V4.1 Ground Water Depth and Gradient <br /> s <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 0 and 20 feet below ground surface. <br /> The gradient and direction are difficult to determine in this map <br /> �- No ground water was encountered by the staff of Neil O.Anderson&Associates, Inc. during the <br /> drilling of a groundwater boring to a depth of eight and a half feet on September 5, 2006. <br /> V4.2 Potential Ground Water Contamination Issues 759�F r-�? <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 /> /4.3 Water Sample Location <br /> No wells exist on site. No water sample was taken or analyzed. <br /> r. <br /> 4 <br /> 6. '.44 <br /> L <br />