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LOGE 2211 Page 2 Proposed Septic System Mr. Ulloa plans to build a new septic system for each new residence. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site addresses. 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 151 septic systems per square mile are located in the immediate vicinity of the Site. The Site is located within a mixed rural residential and agricultural area. A mobile home park is adjacent to the north. Outside of the residential area, many of the surrounding properties are orchards. 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, though one permit indicated leach lines with a sump. 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 2018 and the 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 38 to 45 feet below mean sea level. Ground water appears to flow to the east at a rate of approximately 12 to 30 feet per mile.