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Ivy Existing Septic Tank Usage in the Vicinity To determine the existing septic system usage in the area, our office counted septic systems that exist approximately one square mile surrounding the property. Recent air photo imagery from GoogleEarthTm was used. Each building cluster on the photo was assumed to have one septic system. Using this method, we determined that there is a minimum of 32 septic systems per square mile in the immediate vicinity of the Site. 01 The general area consists of vineyards and rural residential properties. City of Lodi residential subdivisions are located approximately one-half mile to the east. 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, the septic systems in the area utilize leach lines or leach lines and sumps. The septic permits can be found in ` v Appendix 4 of this report. Expected On-Site Maximum Septic Tank Usage Maximum expected usage on the Site would be from the winery building and existing 62 residence. Septic system design should be based on the On-Site Wastewater Disposal Standards (2003) or other engineering recommendations. t ; 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 2009 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), ground . ) water elevation is three to four feet above mean sea level; ground water flows toward the southwest at a rate of 13 to 15 feet per mile in the vicinity of the Site. Given that the ground elevation of the Site is approximately 35 to 36 feet, the depth to water below the Site is estimated to be 31 to 33 feet. Potential Ground Water Contamination Issues The Soil Suitability Study is not intended to be an investigation into ground-water CZ�� contamination sources, and no such investigation was conducted. Many sources can contribute to ground water contamination, including leaking underground storage tanks, 6Y. agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural LOGE1013 Page 3