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These permits have been included in Appendix 4 of this report. 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 photograph was assumed to have one septic system. Using this method, it is estimated that at least 35 septic systems per square mile are located in the immediate vicinity of the Site. The vicinity of the Site is composed of rural residences and agricultural land, including vineyards and orchards. A PG&E substation is located adjacent to the north. Micke Grove Park and Golf Course are located less than one-half mile to the east. 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 with 25 -foot deep seepage pits; one permit indicated sumps. 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. 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 the fall of 2018 and spring of 2019 were the most recent available from this source. According to an analysis of these maps (Plates 4 and 5), ground -water elevation is approximately 27 feet below mean sea level. Ground water appears to flow to the southeast at a rate of approximately 5 to 6 feet per mile. Given that the ground elevation of the Site is 33 to 35 feet above mean sea level, the depth to water below the Site is estimated to be approximately 60 to 62 feet. 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 LOGE 2218 Page 3