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i Expected On-Site Maximum Septic Tank Usage Maximum expected septic usage on the Site would be from the existing and any future residential uses. Septic system design should be based on the On-Site Wastewater ' :Disposal Standards(2003) or other engineering recommendations. Ground Water Information Depth and Gradient Live Oak reviewed ground water elevation information available from the San Joaquin County Flood Control and Water Conservation District to determine the ground water levels near the Site. Data from spring and fall of 2009 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), ground water elevation is five to 18 feet below mean sea level, depending on the season. During the fall of 2009, ground water flows down to the east-northeast at a rate of � approximately 2.4 feet per mile in the vicinity of the Site; the ground water gradient in the area is uncertain for the spring of 2009. Given that the ground elevation of the Site is approximately 40 feet, the depth to water below the Site is estimated to range between 45 to 58 feet. Potential Ground !Nater Contamination Issues The Soil Suitability Study is not intended to be an investigation into ground-water contamination sources, and no such investigation was conducted. Many sources can contribute to ground water contamination, including leaking underground storage tanks, agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural activities and the use of septic systems in the area are known ground water contamination sources with the potential to impact the Site. A dairy is located to the north. On-Site Wells One domestic well and three irrigation wells exist on the Site, as depicted on Plate 2. Seven well permits for the Site were identified at the San Joaquin County Environmental Health Department; the permits have been included in Appendix 4: • August 1972 permit for installation of new irrigation well; • December 1998 permit for installation of new pump at irrigation well; • November 1999 permit for pump repair at domestic well; • December 1999 permit for well destruction; • December 1999 permit for new irrigation well, • January 2000 permit to abandon pilot hole; • July 2008 permit for pump repair at irrigation well. LOGE1024 Page 3