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Hieb Family 1990 Trust Prouty Page 3 of 11 <br /> Our Project Number: E0714411 <br /> December 17, 2007 <br /> I <br /> 3.4 Existing Septic Tank Usage in the Vicinity <br /> In an attempt to determine the septic system density for the vicinity of the Site, our office <br /> reviewed a recent aerial photograph (12/17/2007) of the subject property available from Google <br /> EarthT"'. We counted the building clusters within one square mile of the Site, and made the <br /> Fiassumption that each building cluster has one septic system. Using this method, we <br /> determined that there are a minimum of fourteen (14) septic systems per square mile in the <br /> Fiimmediate vicinity of the site. <br /> The general area consists of agricultural land and a few scattered residences. <br /> 3.5 Septic Permit History in the Vicinity <br /> Based on file review at the EHD, the septic systems in the area appear to utilize leach lines and <br /> seepage pits. <br /> F 3.6 Septic Repair Permit History in the Vicinity <br /> ' tics stem repairs in the area <br /> Based on file review at the EHD, h the septic y p appear to be for the <br /> addition of leach lines and seepage pits. <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 <br /> second dwelling unit. Septic system design should be based on the On-Site Wastewater <br /> Disposal Standards or other engineering recommendations. <br /> k4.0 GROUND WATER INFORMATION <br /> 4.1 Ground Water Depth and Gradient <br /> The San Joaquin County Public Works Department, Water Resources Division (Fall 2003 and <br /> Fi Spring 2004) ground water elevation maps were reviewed to determine the ground water levels <br /> near the site. The Fall 2003 and Spring 2004 maps are the most current official maps available <br /> from the County. According to these maps (Plates 3 & 4), ground water lies between anF! J <br /> elevation of 20 and 40 feet below sea level and flows at a gradient of about 10 feet per mile to <br /> the southeast in the vicinity of the site. <br /> Table 1. <br /> Ground Water Summary <br /> Site Topographic Elevation .Ground Water Elevation Estimated Depth <br /> (ft. above sea level) (ft. below sea level) to Ground Water(ft. bgs) <br /> Fall 2003: -30 to-40' <br /> 60 to 55' 80 to 105' <br /> Spring 2004: -20 to-30' <br /> P <br /> "0104 <br /> 902 Industrial Way-Lodi,CA 95240.209.367.3701 -Fax 209.369.4228 02007 Nei!O.Anderson&Associates,Inc <br />