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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 130 septic systems per square mile are located in the immediate vicinity of the Site. The Site is located within an area of rural residences and orchards; a few commercial/industrial properties are located one-third of a mile 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, most septic systems in the area utilize leach lines; one utilized leach lines and sumps. The septic permits can be found in Appendix 4 of this report. Expected On-Site Maximum Septic Tank Usage Maximum expected septic tank usage on the Site would be from the current residents and future guests of the Site. 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 5 and 6), ground water elevation in the area is approximately five to 10 feet below mean sea level. The ground-water flow is to the north or north-northeast at a rate of approximately four feet per mile. Given that the ground elevation of the Site is approximately 20 feet above mean sea level, the depth to water below the Site is estimated to be approximately 25 to 30 feet. The Well Completion Report for the new domestic well on the Site (Appendix 4) indicates that the static water level beneath the Site was 32 feet in October of 2015. San Joaquin County experienced its highest recent ground-water levels in 1983 and 1999 (Plates 7 and 8). Based on review of maps of ground-water levels for spring of LOGE 1938 Page 3