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Expected On-Site Maximum Septic Tank Usage Maximum expected usage on the Site would be from the prayer hall and the existing residences. 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 fall and spring of 2012 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), ground water elevation is approximately 35 to 38 feet below mean sea level; ground water flows 1 > toward the east at a rate of approximately five to seven feet per mile in the vicinity of the Site. , Given that the ground elevation of the Site is 35 feet, the depth to water below the Site is estimated to be 70 to 73 feet, depending on the season. Potential Ground Water 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. Additionally, based on the topographic map discussed previously, industrial waste ponds were located approximately one-quarter mile southwest of the Site in the recent past. On-Site Wells According to the site plan, one domestic well exists on the Site (Plate 2). Four well permits for the Site address were identified from San Joaquin County Environmental Health Department records: • October 1979 permit for pump repair at irrigation well. • October 1987 permit for pump repair at domestic well. • February 1991 permit for pump repair at irrigation well. • October 1993 permit for pump repair at well (probably domestic). These permits are included in Appendix 4 of this report. LOGE 1325 Page 3