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Existing Septic Tank Usage in the Vicinity To estimate the septic system usage in the area, our office counted septic systems that exist within approximately one square mile surrounding the property. Air photo imagery from Google Earth was used. Each building cluster on the photo was assumed to have one septic system. Using this method, it is estimated that at least 200 septic systems per square mile are located in the immediate vicinity of the Site. The majority of the systems are concentrated to the north, in the greater Tracy area. The Site is located in an area with small residential lots to the north, agricultural land to the south and east, and a few commercial structures to the west. 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, septic systems in the area utilize leach lines, filter beds, leach lines with sumps, and leach lines with seepage pits. 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 future residents of the Site, as well as winery customers. Any future septic system design should be based on the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) or other engineering recommendations; no new septic construction is anticipated. 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 4 and 5), ground water elevation is approximately 8 to 25 feet above mean sea level; the ground-water flow beneath the Site is to the north or northwest at a rate of approximately 16 to 20 feet per mile. Given that the ground elevation of the Site is approximately 128 to 133 feet above mean sea level, the depth to water below the Site is estimated to be approximately 103 to 125 feet. 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 LOGE 20-19 Page 3