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Past Uses of the Site Based on information reviewed for the Surface & Subsurface Contamination Report (Live Oak, 2015), the Site has been used for agriculture since 1937 or earlier. It appears that the buildings on the Site were constructed from the 1800s through the 1970s. Existing and Proposed Septic Tank Usage Existing Septic System According to the tentative parcel map (Quartaroli, 2015), two septic systems are currently located on the Site, one at each house. Proposed Septic System Mr. Navarra indicated that no new construction is planned for the Site. On-Site Septic Permit History One septic system permit for the Site was identified at the San Joaquin County Environmental Health Department. The permit, dated June 1981, was for the addition of two 80-foot leach lines and two 48-inch diameter seepage pits to an existing residential septic system at 25144 South Bird Road. A copy of the permit has been included in Appendix 4 of this report. 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. Aerial imagery from GoogleEarth was used. Each building cluster on the photograph was assumed to have one septic system. Using this method, it is estimated that six or more septic systems per square mile are present in the immediate vicinity of the Site. The general area consists orchards and agricultural land with scattered rural residences. To the northwest of the Site is the Rhodes-Stockton Bean Co-op facility. 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, it appears that the septic systems in the area utilize leach lines, leach lines with sumps, or filter beds. The septic permits can be found in Appendix 4 of this report. LOGE 1502 Page 2