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October 23, 2009 Page 2 of 9 Our Project Number: LGS0090519 with a minimum parcel size of 40 acres. This zoning designation "is established to preserve agricultural lands for the continuation of commercial agricultural enterprises." A site map and vicinity map are included in Appendix A of this report as Plate 1 and 2, / , - respectively. The Site has been and is still currently used for growing row crops. 2.0 EXISTING AND PROPOSED SEPTIC TANK USAGE According to San Joaquin County files, no septic systems currently exist on the site. No on-site septic permits were found for the Site during a recent file review at the EHD. In an attempt to determine the septic system density for the vicinity of the Site, our office reviewed a recent aerial photograph of the subject property available from GoogleEarthr". We counted the building clusters within one square mile of the Site, and made the assumption that each building cluster has one septic system. Using this method, we determined that there are a minimum of 20 septic systems per square mile in the immediate vicinity of the Site. As indicated, the general area consists of agriculture with a few scattered residences. Based on our recent file review at EHD, the septic systems in the area appear to utilize leach lines with some filter beds. From our review, the septic repairs in the vicinity appear to consist of the addition of leach lines. Some examples of these repair permits can be found in Appendix B. Maximum expected usage on the proposed parcel would be for a primary residence and second dwelling unit. Septic system design should be based on the County On-Site Wastewater Disposal Standards or specific engineering recommendations. 3.0 GROUNDWATER INFORMATION 3.1 Groundwater Depth and Gradient The San Joaquin County Flood Control and Water Conservation District (2003 and 2004) groundwater elevation maps were reviewed to determine the groundwater 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) in Appendix A, groundwater elevation lies between 0 and 10 feet below mean sea level. The elevation of the land, as previously mentioned in Section 1.1, ranges between approximately 8 and 21 feet above mean sea level. Therefore, the depth to groundwater (the difference between the elevation of the Site and the elevation of groundwater), ranges between approximately 8 and 31 feet below the ground surface. The groundwater in the vicinity of the Site appears to flow to the northwest. No groundwater was encountered by the staff of Neil O. Anderson and Associates, Inc. during the drilling of the borings throughout the project to a maximum depth of 8 feet below ground surface. 902 Industrial Way- Lodi,CA 95240•209.367.3701 •Fae 209.369.4228 (02009 Neil O.Anderson&Associates.Inc