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Rose Family Property Page 3 of 8 Our Project Number: LGS080526 July 24, 2008 3.6 Septic Repair Permit History in the Vicinity Based on a recent file review at the EHD, the septic repairs in the vicinity ppear to be for the addition of leach lines. The septic repair permits are included in 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 baked on the On-Site ear 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 e County. According to the map§„(Plates 3 and 4), groundwater elevation lies betwe20 fe t below mean sea level nd 40 felet-atiove mean sea level. The elevation of the "- s previously mentioned in Section 1.1, ranges between approximately 60 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 20 and 70 feet below the ground surface. The groundwater in the vicinity of the Site appears to flow to the -northwest. No groundwater was encountered by t e staff of Neil O. Anderson and Associates, Inc. during the drilling of an eight and a half (8.5) f of groundwater boring on July 10, 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 sources of groundwater contamination. 4.3 __Water Sample Location No water wells exist on the site, therefore no well water samples were collected or analyzed. No permits were found during a recent file review at EHD. 902 Industrial Way- Lodi,CA 95240.209.367.3701 -Fax 209.369.4228 �c2008 Ned O.Anderson&Associntcs.Inc