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May 25, 2006 <br /> NOA Project Number: E06040A <br /> 3.6 Septic Repair Permit History in the Vicinity <br /> L The following septic system repair permits were found for the vicinity of the Site during file review <br /> at the EHD on April 20,2006: <br /> Table 2. <br /> Vicinity Septic System Repair Permit Summary <br /> Address,Date Tank Lines,Length,Pits Comments <br /> Capacity <br /> 3333 South 99 Frontage Road — Two 25'x 36" seepage pits Repair/Addition to <br /> 8-2499 Commercial <br /> L The one repair permit found in the vicinity was for the addition of two seepage pits. <br /> 3.7 Expected On-Site Maximum Septic Tank Usage <br /> ` The maximum expected septic tank usage for the site will be from 2 to 3 employees working on the <br /> subject property. One septic system is being proposed for construction. Septic system design should <br /> be based on the On-Site Wastewater 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 determtine 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 /> L According to these maps (Plates 3-6),ground water lies between 60 and 70 feet below ground <br /> surface and flows at a gradient of about 10 feet per mile to the northeast in the vicinity of the Site. <br /> LNo ground water was encountered by the staff of Neil O.Anderson&Associates, Inc. during the <br /> drilling of one deep percolation test hole to a depth of approximately 25 feet on April 24, 2006. <br /> L4.2 Potential Ground Water Contamination Issues <br /> L 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 and the use of septic systems in the area should <br /> Lbe considered potential ground-water contamination sources. <br /> L <br /> 4 <br /> I <br /> "44.. <br /> L <br />