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Past Uses of the Site Based on information reviewed for the Surface & Subsurface Contamination Report (Live Oak, 2013), the Site has been grazing land since 1937 or earlier. Most structures on the Site date to 1937 or earlier; the structures in the northern building cluster may date to 1947. Existing and Proposed Septic Tank Usage Existing Septic System According to the tentative parcel map (Baumbach & Piazza, 2013), two septic systems exist on the Site. One serves the residence, and the other serves the bunk house. Proposed Septic System According to Ms. Balogh, no new construction is planned for the Site at this time. However, County regulations would permit a residence and a second dwelling unit to be placed on Parcel 2 at some point in the future. Any new residence would utilize a new septic system. On-Site Septic Permit History No permits related to septic systems for the Site address 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 GoogleEarth was used. Each building cluster on the photo was assumed to have one septic system. Using this method, it is estimated that five or more septic systems per square mile are present in the immediate vicinity of the Site. The general area consists of open grazing land with scattered rural residences. 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 utilize leach lines and seepage pits, one permit indicated leach lines and sumps. The septic permits can be found in Appendix 4 of this report. LOGE 1322 Page 2