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January 4,2006 <br /> NOA Project Number: E05166B <br /> The septic system in the area appears to utilize leach lines and pits. <br /> ` 3.6 Septic Repair Permit History in the Vicinity <br /> G The following septic system repair permits were found for the vicinity of the Site during file review <br /> at EHD on December 20,2005. <br /> Table 3. <br /> Vicinity Septic System Permit Summary. <br /> Address,Date Tank Lines,Length,Pits Comments <br /> Capacity <br /> 17551 North Tretheway Addition of <br /> 8-12-74 2 seepage pits 33"x 25' Addition/Repair <br /> 17451 North Tretheway Addition of <br /> 6-2-78 2 seepage pits 33"x 25' Addition/Repair <br /> 17451 North Tretheway Addition of <br /> 8-13-73 2 seepage its 33"x 25' Addition/ Repair <br /> ... The septic system repairs in the area appear to be for the addition of pits. <br /> 3.7 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-Site Wlastexater Disposal Standards <br /> +� or other engineering recommendations. <br /> .. �' 4.0 GROUNDWATER 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 90 and 100 feet below ground <br /> surface and flows at a gradient of about 20 feet per mile down to the east in the vicinity of the Site. <br /> No ground water was encountered by the staff of Neil O. Anderson&Associates, Inc. during the <br /> drilling of 7 percolation test holes to a depth of three and a half feet and 25 feet on December 1, 4 <br /> and 18,2005. <br /> 4 <br />