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` October 13,2004 <br /> NOA Project Number: E040112B <br /> Address,Date Tank Lines,Length,Pits Comments <br /> Capacity <br /> 11854 E.Norman Ave.,4-7-71 1,200 gal Two 75-ft leach lines,two 33-in New installation to <br /> diameter by 25-ft deep seepage pits residence. <br /> The majority of septic systems in the area appear to utilize leach lines with seepage pits. <br /> 3.6 Septic Repair Permit History in the Vicinity <br /> The following septic system repair permits were found for the vicinity of the Site during file review <br /> at EHD on October 5,2004: <br /> Table 2. <br /> Vicinity Septic System Repair Permit Summary. <br /> Address,Date Tank Lines,Length,Pits Comments <br /> Capacity <br /> 11845 E.Norman Ave.,11-2-81 Not reported Not reported Addition of one 50-ft leach line,one <br /> 33-in diameter by 25-ft seepage pit to <br /> existing residential unit. <br /> 11845 E.Norman Ave.,3-19-87 Not reported Not reported Addition of one 40-ft leach line,one <br /> 33-in diameter by 25-ft deep seepage <br /> it to existing residential unit. <br /> `t4w <br /> Both repair permits involved additions to the same system. <br /> 3.7 Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected usage on each proposed parcel would be for a primary residence and second <br /> dwelling unit. Septic system design should be based on the On-Site Wastewater Disposal Standards or 3 l <br /> 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 official maps available from the County. <br /> According to these maps (Plates 3-6),ground water lies between 80 and 100 feet below ground <br /> Lsurface and flows at a gradient of 20 to 40 feet per mile to northeast in the vicinity of the Site. <br /> No ground water was encountered by the staff of Neil O.Anderson&Associates, Inc. during the <br /> Ldrilling of two percolation test holes to a depth of 25 feet on October 4,2004. <br /> 4 <br /> k '0044 <br /> a ' <br />