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L N100 <br /> LDecember 1,2004 <br /> NOA Project Number: E04117A <br /> Table 2. <br /> —Vicinity Septic System Repair Permit Summa — <br /> Address,Date Tank Lines,Length,Pits Comments <br /> Capacity <br /> 23752 East Liberty Road,3- Not reported Not reported Addition of one 40'leach line, <br /> 22-01 one 36"by 25'pit and one sump <br /> 22077 Liberty Road,8-12-92 1,200 gal Two 40-ft leach lines,33-in Addition of one sump 10xl0x2 <br /> diameter by 25-ft deep feet deep <br /> see a its <br /> Both repair permits found in the vicinity were for the addition of leach lines. <br /> 3.7 Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected usage would be for a primary residence and second dwelling unit on each <br /> parcel. Septic system design should be based on the On-Site Wastewater Disposal Standards or other <br /> 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 /> L 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 120 and 150 feet below ground <br /> 6. surface and flows at a gradient of 50 feet per mile to the north in the vicinity of the Site. <br /> No ground water was encountered by the staff of Neil O.Anderson&Associates, Inc. during the <br /> L. drilling of twelve percolation test holes to a depth of 25 feet on November 10, 2004. <br /> / <br /> ✓ 4.2 Potential Ground Water Contamination Issues <br /> Identifying Voten ' ground-water contamination sources was not part of the scope of work for the <br /> i soil suitability study. Potential ground-water contamination can occur from a number of sources <br /> 1. which often include leaky underground storage tanks,agricultural activities, dairies, septic systems, <br /> 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 /> V <br /> L <br /> 4 <br /> "44 r. <br /> L <br />