SU0007673 SSNL - Laserfiche WebLink

Home Browse Search

Our Project Number. LES090550 Page 2 of 6 June 30, 2009 A site map and vicinity map are included in Appendix A of this report as Plate 1 and 2, 3J respectively. The Site has been and is, used for agricultural purposes. 2.0 EXISTING AND PROPOSED SEPTIC TANK USAGE According to San Joaquin County files, one septic system currently exists on the site. One on- site septic permit was found for the Site during a recent file review at the EHD. The permit can be found in Appendix B. A4-3J X,0 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 GoogleEarth'". 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 85 septic systems per square mile in the immediate vicinity of the Site. As indicated, the general area consists of agricultural land with scattered residences. Based on our recent file review at EHD, the septic systems in the area appear to utilize leach (2 lines and seepage pits. 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. C35 3 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 (2007 and 2008) groundwater elevation maps were reviewed to determine the groundwater levels near the Site. The Fall 2007 and Spring 2008 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 40 and 60 feet below mean sea level. The elevation of the land, as previously mentioned in Section 1.1, ranges between approximately 65 and 70 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 125 and 130 feet below the ground surface. The groundwater in the vicinity of the Site appears to flow to the south. No groundwater was encountered by the staff of Neil O. Anderson and Associates, Inc. during the drilling of the borings on June 23, 2009. 3.2 Potential Groundwater Contamination Issues Identifying potential groundwater contamination sources (such as leaky underground storage tanks, agricultural operations, dairies, septic systems, and storm water infiltration) was outside the scope of our services. '044 f) 902 Industrial Way• Lodi,CA 95240. 209.367.3701 •Fax 209.369.4228 ©2009 Neil 0.Anderson&Associates,Lac