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Mary's Mini Mary I -..- Page 3 of 10 Our Project Number: LGS080518 May 30, 2008 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 and seepage pits. The septic permits can be found at the end of this report. 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 seepage pits. The septic repair permits can be found in the back of this report. 3.7 Expected On-Site Maximum Septic Tank Usage Maximum expected usage on the property will be for customers and employees of the existing retail store. Three (3) employees are proposed to be staffed at the mini mart, and an estimated average of approximately 75 cars served per day. Septic system design should be based on the On-Site Wastewater Disposal Standards or other engineering recommendations. 4.0 GROUNDWATER INFORMATION 4.1 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), groundwater elevation lies between 40 and 70 feet above mean sea level. The elevation of the land, as previously mentioned in Section 1.1, ranges between approximately 170 and 180 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 100 and 140 feet below the ground surface. The groundwater in the vicinity of the Site appears to flow to the west. No groundwater was encountered by the staff of Neil O. Anderson and Associates, Inc. during the drilling of any of the borings on May 29, 2008. 4.2 Potential Groundwater Contamination Issues Identifying potential groundwater contamination sources was not part of the scope of work for the soil suitability study. Potential groundwater 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 groundwater contamination sources. 902 Industrial Way• Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 OI008'Neil 0..4nderson 6 Assxiates.lne