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Past Uses of the Site Based on historical aerial photographs reviewed, the Site has been used for agriculture since the 1930s or earlier. Mr. Henry has indicated that the stone house is approximately 140 years old, and the other structures all date to before 1959. At feast three additional structures, including a barn, an equipment shed, and a possible hotel or commercial building, were present on the Site in the past. Dredge tailings were once placed along the southern side of the property by a nearby mining operation; the ponds on the Site were left after the removal of the tailings, according to Mr. Henry. Existing-andProposed_ Septic Tank Usage Existing Septic System It is likely that two septic systems exist on the Site, one for each of the houses. Beyond those indicated on the septic permit discussed below, no details of the septic systems are Known. Mr. Henry indicated that the wooden house has been unoccupied in the recent past. Proposed Septic System According to Mr. Henry, no new construction is planned for the Site. However, new homes could be placed on Parcel 2 and Parcel 3 at some point in the future. Any new residences would utilize new septic systems. On-Site Septic Permit History One permit related to septic systems on the Site was identified at the San ,Joaquin County Environmental Health Department. This permit, dated 9999, is for the addition of one 40-foot leach line and one 36-inch diameter by 25-foot deep seepage pit to an existing residential system; the listed address is 24658 Mackville Road. Mr. Henry indicated this permit must refer to the stone house since the wooden house has not been occupied recently. The permit is included in Appendix 4. 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 one square mile surrounding the property. Air photo imagery from GoogleEarthT"A was used. Each building cluster on the photo was assumed to have one septic system. Using this method, it is estimated that 20 or more septic systems per square mile are present in the immediate vicinity of the Site. The general area consists of open farmland, orchards, and rural residential properties. LOGE 1107 Page 2 ............................................................................................................................................................... ...................................................................... ......................................