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This zoning designation "is established to preserve agricultural lands for the continuation of commercial agricultural enterprises." Existing and Proposed Septic Tank Usage Existing Septic System According to Mr. Shinn, one septic system serves the existing house (Plate 3). Proposed Septic System The site plan indicates that a new septic system is planned to serve the proposed new winery (Plate 2). On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site addresses. No 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 20 septic systems per square mile are located in the immediate vicinity of the Site. The general area primarily consists of vineyards with scattered rural residences; a few orchards are located nearby as well. The Mokelumne River runs along the east side 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, septic systems in the area have been designed in a variety of ways: filter bed, leach lines, leach lines with sumps, and leach lines with a seepage pit. 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 house, as well as future employees and customers of the winery. A new septic system is planned to serve the proposed winery. Septic system design should be based on the On-Site Wastewater Treatment Systems Standards (2017) or other engineering recommendations. LOGE 1841 Page 2