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• September 1990 permit for new residential septic system. The system utilized a 1,200-gallon tank and three 80-foot leach lines. • March 2001 permit to connect new agricultural building (the now-updated winery building) to septic system at fruit stand. Four 75-foot leach lines and four 4-foot by 12-foot by 8-foot deep sumps were added to the existing system. The permit also notes that the restaurant utilizes a separate septic system on the east side of the building. These permits are 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 GoogleEarthTM was used. Each building cluster on the photo was assumed to have one septic system. Using this method, it is estimated that at least 20 septic systems per square mile are located in the immediate vicinity of the Site. The general area consists of vineyards and agricultural land with occasional rural residences. A trucking yard is located adjacent to the west. Approximately 0.6 miles west of the Site is the Flag City truck stop. Septic Permit History in the Vicinity Based on a recent review of septic permits on file at the San Joaquin County Environmental Health Department for nearby properties, most septic systems in the area appear to utilize leach lines or leach lines with sumps. 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 cafe, tasting room, and winery, additional future customers and employees, and the existing residence. Septic system design should be based on the On-Site Wastewater Disposal Standards (2003) 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 fall of 2013 and spring of 2014 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), LOGE 1508 Page 3