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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. 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 50 septic systems per square mile are located in the immediate vicinity of the Site. The area surrounding the Site consists primarily of vineyards with rural residences along the roadways. A residential neighborhood with smaller lots is located approximately one-quarter mile northwest of the Site. 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 and seepage pits; one system only utilized leach lines. 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 proposed residence. 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 18 to 20 feet below mean sea level; ground water flows down to the northeast at a rate of approximately 13 to 18 feet per mile. r Iff er t v 6 7d yr ac s ro , LOGE 1923 Page 2