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W Lange Property Page 3 Our Project Number: LGS080011 February 28, 2008 AS Septic Permit History in the Vicinity Based on a recent file review at EHD, the septic systems in the area appear to utilize leach lines with seepage pits. P'3.6 Septic Repair Permit History in the Vicinity Based on a recent file review at EHD, the septic repair permits are for the addition of leach lines and seepage pits. x/3.7 Expected On -Site Maximum Septic Tank Usage Maximum expected usage on each proposed parcel would be for a primary residence and second dwelling unit. Septic system design should be based on the On -Site Wastewater Disposal Standards or other engineering recommendations. 4.0 GROUND WATER INFORMATION ,/ 4.1 Ground Water Depth and Gradient The San Joaquin County Flood Control and Water Conservation District (2003 & 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 & 4), ground water elevation lies between 10 and 20 feet below mean sea level. The elevation of the land, as previously mentioned in Section I.1.1, ranges between approximately 25 and 45 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 35 and 65 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 of any of the borings on January 29, 2007 or February 12, 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. 4.3 Water Sample Location According to Brad Lange, one water well exists near the center of the southern portion of the property. No well permits were found during a recent file review at EHD. 902 Industrial Way - Lodi, CA 95240 - 209.367.3701 - Fax 209.369.4228 ©2008 Neil O. Anderson & Associates, Inc