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Past Uses of the Site `.. Based on aerial photographs obtained from the San Joaquin County Surveyor's Office, the Site was pasture from the 1930s through the 1970s; the house on the Site was built between 1952 and 1963. As part of the Surface & Subsurface Contamination Report Update (Live Oak, 2016), Mr. Martinez indicated that he has owned the Site since 2010, and that during that time it has been used to grow grass for fodder. Existing and Proposed Septic Tank Usage Existing Septic System According to the tentative parcel map (Monte Seibel, 2015), one septic system is currently located on the Site to serve the house. Proposed Septic System Mr. Martinez indicated that he is not planning any new construction for the Site at this time, beyond building the private road that will lead onto the Site. The future buyers may wish to build homes; individual septic systems would be required on each parcel. On-Site Septic Permit History Live Oak reviewed the San Joaquin County Environmental Health Department well and septic permit files for the Site address; one permit was identified. The permit, dated February 2011 , was for a repair to an existing residential septic system. A new 1 ,600- gallon septic tank replaced the previous tank, and a 40-foot leach line with a three-foot diameter by 25-foot deep seepage pit was installed. The permit also depicts a well to the northwest of the house. 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 one square mile 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 112 or more septic systems per square mile are present in the immediate vicinity of the Site. The general area consists of rural residences and orchard. 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 most septic systems in the area utilize leach lines and seepage pits; one system utilizes a leach line and a sump. The septic permits can be found in Appendix 4 of this report. LOGE 1602 Page 2