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Past Uses of the Site Based on aerial photos reviewed for the Surface and Subsurface Contamination Report (Live Oak, 2012), it appears that the Site was grazing land in 1937 or earlier. Portions of the Site have been irrigated pasture from 1963 or earlier through the present. Existing and Proposed Septic Tank Usage Existing Septic System No septic systems exist on the Site. Proposed Septic System There are no plans for construction on the Site. However, a new home could be placed on any numbered parcel at some point in the future. If so, it would utilize a new septic (� system. On-Site Septic Permit History No septic system permits for the Site were identified at the San Joaquin County Environmental Health Department. Existing Septic Tank Usage in the Vicinity To estimate the existing septic system usage in the area, our office counted septic systems that exist within approximately four square miles 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 less than one septic system per square mile is located in the immediate vicinity of the Site. The general area consists of vineyards, orchards, and open grazing land. 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, the septic systems in the area primarily utilize leach lines and seepage pits. One permit indicated a system with seepage pits and a sump. The septic permits can be found in Appendix 4 of this report. Expected On-Site Maximum Septic Tank Usage Maximum expected septic usage on the Site would be from any future residential uses. No construction is planned at this time. Septic system design should be based on the On-Site Wastewater Disposal Standards (2003) or other engineering recommendations. LOGE 1217 Page 2