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December 11, 2006 <br /> NOA Project Number: E06141A <br /> Table 2. <br /> Vicinity Septic System Repair Permit Summary <br /> Address,Date Tank Lines,Length,Pits Comments <br /> Capacity <br /> 26947 South Austin Road --- -- Addition of 160 feet of leach / <br /> line to existing system <br /> 3-31-71 <br /> The septic repair permit in the area appears to be for the addition of leach line to an existing septic <br /> -- system. <br /> 3.7 Expected On-Site Maximum Septic Tank Usage <br /> One primary residence and a secondary dwelling will be the maximum expected septic tank usage / <br /> for each lot on the subject property. Septic system design should be based on the On-Site Wlastewater <br /> Disposal Standards or other engineering recommendations. <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 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 offiCnI <br /> a ' able from the County. <br /> According to these maps (Plates 3-6),ground water lies betwe 20 et below ground <br /> surface and flows at a gradient of about 5 feet permile to thee vi 'ty of the Site. <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 8.5 feet on October 31, 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 /> 5 <br />