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L <br /> LJune 6,2006 <br /> NOA Project Number. E06019B <br /> 3.6 Septic Repair Permit History in the Vicinity <br /> LThe following septic system repair permit was found for the vicinity of the Site during file review at <br /> EHD on March 8, 2006. <br /> 6. Table 3. <br /> Vicinity Septic System Permit Summary. <br /> Address,Date Tank Lines,Length,Pits Comments <br /> L Capacity <br /> 13665 Jack Tone Road -- Addition of one 40'leach line t 6 $Addition/Repair ( J <br /> LThe septic system repair in the area appears to be for the addition of a leach line. <br /> L3.7 Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected on-site septic tank usage for each parcel would be for a primary residence and a <br /> secondary dwelling unit. System design should be based on the On-Sate Wastewater Disposal Standards (3' J <br /> L or other engineering recommendations. <br /> 4.0 GROUND WATER 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 110 and 120 feet below ground <br /> surface and flows at an uncertain gradient. <br /> r. <br /> No ground water was encountered by the staff of Neil O.Anderson&Associates, Inc. during the <br /> drilling of 2 percolation test holes to a depth of 3 feet and 2 percolation test holes to a depth of 25 <br /> feet on May 17,2006. <br /> L4.2 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 /> and storm water infiltration. Agricultural activities,dairies and the use of septic systems in the area <br /> Lshould be considered potential ground-water contamination sources. <br /> 4 <br /> L '004 <br /> I <br /> L <br />