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Proposed Septic System Mr. Ng plans to build a new septic system for the new residence. 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 four septic systems per square mile are located in the immediate vicinity of the Site. The Site is located within an agricultural area primarily consisting of orchards and open crop land. Seven dairies are located within three-quarters of a mile of the Site. Septic Permit History in the Vicinity Based on a review of septic permits on file at the San Joaquin County Environmental , lxhv Health Department for nearby properties, most septic systems in the area utilize leach ' lines; one systems utilized a filter bed. The septic permits can be found in Appendix 4 of this report. Expected On-Site Maximum Septic Tank Usage Maximum expected septic tank 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 spring and fall of 2016 were the most recent available from this source. According t _an analysis of these maps (Plates 5 and 6), ground water elevation in the area is a roximately 18 to 20 feet above mean sea level. The ground-water flow is to the north or southwest, depending on the season; the rate could not be calculated because the Site is just beyond the outermost contour on each map. LOGE 1914 Page 2