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L <br /> September 14,2006 <br /> NOA Project Number: E06095A <br /> Table 2. <br /> Vicinity Septic System Repair Permit Summary <br /> Address, Date Tank Lines, Length,Pits Comments <br /> Capacity <br /> 10920 Mariposa Road 1600 gal Three,100'leach lines, Old septic tank removed, <br /> 10-9-89 new 1600 gal tank installed <br /> L <br /> All of the repair permits found in the vicinity were for the addition of leach lines and seepage pits. 6 -6) <br /> v3.7 Expected On-Site Maximum Septic Tank Usage <br /> i 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 Wastewater (3 -4) <br /> Disposal Standards or other engineering recommendations. <br /> 4.0 GROUNDWATER INFORMATION <br /> L4.1 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 80 and 100 feet below ground i <br /> surface and flows at a gradient of about 10 feet per mile to the north-northeast in the vicinity of the <br /> Site. <br /> LNo ground water was encountered by the staff of Neil O.Anderson&Associates, Inc. during the <br /> drilling of four percolation test holes to depths of 3.5, 14.5 and 17.5 feet on August 22, 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 /> L and storm water infiltration. Agricultural activities and the use of septic systems in the area should <br /> be considered potential ground-water contamination sources. <br /> j 4.3 Water Sample Location <br /> ` One irrigation well was observed on the subject property. According to Ms. Moore,that well is an <br /> Lirrigation well which has not been used in a long time. She indicated that a domestic well is located <br /> 4 <br /> L <br /> L <br />