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Bail Bond Business Page 3 of 13 Our Project Number: LGS080S49 January 13, 2009 1.3.4 Existing Septic Tank Usage in the Vicinity 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 TM. We counted the building clusters within one square mile of the Site, and made the assumption that each buildin uster has one septic system. Using this method, we determined that there are minimum of�50 septic systems per square mile in the immediate vicinity of the Site. The general area consists of residential housing and limited light industrial activity. 1.3.5 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 some sumps. The septic permits can be found in the back of this report. 1.3.6 Septic Repair Permit History in the Vicinity Based on a recent file review at the EHD, the septic repairs in the vicinity appear to be for the addition of leach lines and sumps. The septic repair permits can be found in the back of this report. 1.3.7 Expected On-Site Maximum Septic Tank Usage The expected septic system use will be for one to two (1 to 2) employees of the bail bonds business on site. Please see the Nitrate Loading study for more details regarding specific use. 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 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), groundwater elevation lies between -10 and -20 feet below mean sea level. The elevation of the land, as previously mentioned in Section 1.1, ranges between approximately 10 and 15 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 20 and 35 feet below the ground surface. The groundwater in the vicinity of the Site appears to flow to the northeast. A groundwater boring was drilled to a depth of eight and a half (8.5) feet on December 10, 2008. No groundwater was encountered. A geotechnical boring was drilled by our office on December 5, 2008. Groundwater was encountered at 28 feet below ground surface. 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02008 Neil O.Anderson&Associates,Inc