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Existing and Proposed Septic Tank Usage Existing Septic System According to the Site Plan prepared by Baumbach & Piazza, Inc. (2015; Plate 2), two septic systems exist on the Site. Proposed Septic System A new septic system is proposed to serve the new tasting room and wine cellar (Plate 2). On-Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. Two permits were identified: • January 1972 permit for addition of one 40-foot leach line and one 33-inch diameter by 25-foot deep seepage pit to existing residential septic system. • December 2004 permit for repair to existing residential system. The septic tank was replaced with a 1,200-gallon concrete tank, and one 40-foot leach line with a 4- by 12- by 8-foot deep sump was added. The permit notes that the "new tank is for grey water from house and garage." The permits are included in Appendix 3 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 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 12 septic systems per square mile are located in the immediate vicinity of the Site. The general area consists of vineyards, orchards, and rural residences. 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 or leach lines with seepage pits; one permit indicated that leach lines with sumps would be installed. The septic permits can be found in Appendix 4 of this report. LOGE 1729 Page 2