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• Past Uses of the Site <br /> Based on information reviewed for the Surface & Subsurface Contamination Report <br /> (Live Oak, 2017), the Site has been used for agriculture since 1937 or earlier, and as an <br /> orchard since the 1970s. The main house on the Site dates to the 1960s and the l ` <br /> second house to the 1940s. The barn, northernmost shop, and one or more sheds <br /> appear to date to the 1940s, 1950s, or earlier. A former house located to the south of <br /> the main house was demolished in the 1950s. <br /> Existing and Proposed Septic Tank Usage <br /> Existing Septic System <br /> Four septic systems are currently located on the Site, according to Mr. Sanguinetti: one <br /> for each house, one for the office, and one for the farm workers' cottage. <br /> Proposed Septic System <br /> No new construction is planned. <br /> On-Site Septic Permit History <br /> Live Oak searched the septic system permits on file at the San Joaquin County <br /> • Environmental Health Department; one septic permit was identified for the Site. The <br /> permit, dated June 1987, was for new residential septic system. The system was to <br /> utilize a 1,200-gallon septic tank, two 85-foot leach lines, and two 33-inch diameter by <br /> 25-foot deep seepage pits. The permit has been included in Appendix 4 of this report. <br /> Existing Septic Tank Usage in the Vicinity <br /> To estimate the existing septic system usage in the area, our office counted septic <br /> systems located within approximately four square miles surrounding the property. <br /> Aerial imagery from Google Earth was used. Each building cluster on the photograph <br /> was assumed to have one septic system. Using this method, it is estimated that eight <br /> or more septic systems per square mile are present in the immediate vicinity of the Site. <br /> The general area consists of orchards and vineyards with rural residences and <br /> agricultural buildings along the roadways. <br /> Septic Permit History in the Vicinity <br /> Based on a review of septic permits on file at the San Joaquin County Environmental <br /> Health Department for nearby properties, it appears that septic systems in the area - <br /> utilize leach lines with seepage pits. The septic permits can be found in Appendix 4 of 3. <br /> this report. <br /> • <br /> LOGE 1704 Page 2 <br />