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«Project_Name» Page 3 Our Project Number: LGS08000S February 28, 2008 each building cluster has one septic system. Using this method, we determined that there are a minimum of 45 septic systems per square mile in the immediate vicinity of the Site. The general area consists of commercial industrial development along Highway 99, with surrounding agriculture. 1.3.5 Septic Permit History in the Vicinity Based on a recent file review at the EHD, the septic systems in the area appear to use leach lines with some seepage pits. 1.3.6 Septic Repair Permit History in the Vicinity Based on a recent file review at the EHD, the septic system repairs in the area appear to be for the addition of leach lines and seepage pits. 1.3.7 Expected On-Site Maximum Septic Tank Usage Maximum expected usage on the Site would be for one small office building with one employee. Septic system design should be based on the On-Site Wastewater Disposal Standards or other engineering recommendations. 1.4 Ground Water Information 1.4.1 Ground Water Deoth and Gradient The San Joaquin County Flood Control and Water Conservation District (2003 and 2004) ground water elevation maps were reviewed to determine the ground water levels near the Site. The Fall 2003 and Spring 2004 maps are the most current official maps available from the County. According to these maps, (Plates 3 and 4), groundwater elevation lies between 50 and 60 feet below mean sea level. The elevation of the land, as previously mentioned in Section I.1.1, ranges between approximately 25 and 30 feet above mean sea level. Therefore, the depth to groundwater (the difference between the elevation of the site and the elevation of ground water), ranges between approximately 75 and 90 feet below the ground surface. The ground water in the vicinity of the site appears to flow to the northwest. No ground water was encountered by the staff of Neil O. Anderson & Associates, Inc. during the drilling to a depth of 5.5 feet on February 1, 2008. 1.4.2 Potential Ground Water Contamination Issues Identifying potential ground-water contamination sources was not part of the scope of work for the soil suitability study. Potential ground-water contamination can occur from a number of sources which often include leaky underground storage tanks, agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural activities and the use of septic systems in the area should be considered potential ground-water contamination sources. 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02008 Neil O.Anderson&Associates,Inc