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Past Uses of the Site <br /> vftwl <br /> Based on information reviewed for the Surface & Subsurface Contamination Report <br /> (Live Oak, 2014), portions of the Site have been used for irrigated pasture and <br /> occasional crops since 1952 or earlier. Mr. Borba indicated that the arena and <br /> associated structures were built around 1980. He stated that the house was moved to <br /> the Site in the early 1990s. <br /> Existing and Proposed Septic Tank Usage <br /> Existing Septic System <br /> According to Mr. Borba, two kno n septic systems are currently located on the Site, one <br /> for the house and mobile home, and one for the bathroom building near the arena. <br /> Proposed Septic System <br /> According to Mr. Borba, no 71 <br /> e construction is planned for the Site. <br /> On-Site Septic Permit History <br /> One permit related to septic systems for the Site was identified at the San Joaquin <br /> County Environmental Health Department. The permit, dated November 1990, was for <br /> a new residential septic system utilizing a 1,200-gallon tank, an 80-foot leach line, and a <br /> 4- by 8- by 18-foot sump. The permit is 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 that exist within approximately four square miles surrounding the property. <br /> Aerial imagery from GoogleEarth 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 /> of more septic systems per square mile are present in the immediate vicinity of the Site. <br /> The general area consists of irrigated pasture and orchards. Five dairies are located in <br /> the immediate vicinity of the Site. <br /> Septic Permit History in the Vicinity <br /> Based on a recent review of septic permits on file at the San Joaquin County <br /> Environmental Health Department for nearby properties, it appears that the septic <br /> systems in the area utilize leach lines with seepage pits; the seepage pits range in <br /> depth from 12 to 25 feet. The septic permits can be found in Appendix 4 of this report. <br /> LOGE 1415 Page 2 <br />