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Den Hartog Property Page 3 of 9 Our Project Number: LGS080514 May 23, 2008 V3.5 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 filter be s. 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. The septic repair permits can be found in the appendix of this report. ✓ 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 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 approximately 0 and 15 feet above mean sea level. As previously mentioned in Section 1.1, the site elevation lies between 5 and 15 feet above mean sea level; therefore, depth to groundwater (the difference between site elevation and groundwater elevation) lies between approximately 5 and 15 feet. A groundwater boring was drilled to a depth of approximately 8.5 feet on May 6, 2008; no groundwater was encountered. 4.2 Potential Groundwater Contamination Issues Identifying potential ground-water 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, dairies and the use of septic systems in the area should be considered potential sources of groundwater contamination. /4.3 Water Sample Location One agricultural well and one domestic well exist on the site. Two permits were found. The first permit was for the installation of the domestic well on site. The second permit was for a repair on the same well. No permit was found for the agricultural well on site. A well water sample was taken on May 5, 2008 by Jessen Welch from the domestic well on site. 902 Industrial Way•Lodi,CA 95240-209.367.3701 •Fax 209.369.4228 02008 Neil O.Anderson&Associates,Inc