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Septic Permit History in the Vicinity Based on a review of septic permits on file at the San Joaquin County Environmental Health Department for nearby properties, most septic systems in the area utilize leach lines only. The septic permits can be found in Appendix 4 of this report. Expected On-Site Maximum Septic Tank Usage Maximum expected usage on the Site would be from the current residents of the Site; no new development is anticipated. Any future septic system design should be based on the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) 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 2016 were the most recent available from this source. According to an analysis of these maps (Plates 6 and 7), ground water elevation is approximately zero to seven feet above mean sea level; the ground- water flow beneath the Site is to the east at a rate of approximately 5 to 9 feet per mile. No ground water was encountered by Live Oak during the drilling of the shallow percolation test boring discussed later in this report. Given that the ground elevation of the Site is approximately five feet above sea level, based on the maps reviewed the depth to water below the Site is estimated to be less than 10 feet. Ground water depth and flow direction in the Delta are highly dependent on seasonal pumping and irrigation. San Joaquin County experienced its highest recent ground-water levels in 1983 and 1999. Maps of ground-water levels were reviewed for this study (San Joaquin County Flood Control and Water Conservation District, 1983 and 1999); however, the Tracy area was not mapped during these years. 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. LOGE 20-12 Page 3