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Proposed Septic System A new septic system will be constructed to serve the new house. On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. One permit was identified, dated November 1986. The permit was for a new residential septic system with a 1,200-gallon tank, two 85-foot leach lines, and two 33-inch diameter by 35-foot deep seepage pits. The permit is 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 photo was assumed to have one septic system. Using this method, it is estimated that at least 75 septic systems per square mile are located in the immediate vicinity of the Site. The area surrounding the Site consists of orchards, rural residential lots, and pasture. 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 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 existing and proposed residences. 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 4 and 5), ground water elevation is approximately 40 to 54 feet below mean sea level. In the spring map, the ground-water direction and gradient could not be determined. In the fall map, ground water flows down to the northwest at a rate of approximately three feet per mile. LOGE 1946 Page 2