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Existing and Proposed Septic Tank Usage Existing Septic System No septic systems are currently located on the Site. Proposed Septic System Mr. Ruvalcaba plans to install new septic systems for the new residences. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site. No septic permits were identified. 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 13 septic systems per square mile are located in the immediate vicinity of the Site. The area surrounding the Site consists of orchards with rural residences. 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 or filter beds. 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. 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 2017 and the spring of 2018 were the most recent available from this source. According to an analysis of these maps (Plates 4 and LOGE 2106 Page 2