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• September 2003 permit for new septic system at new barn. The system utilized a <br /> 1,250-gallon septic tank, two 40-foot leach lines, and two 36-inch diameter by 25- <br /> foot deep seepage pits (15757). <br /> • October 2003 permit for repair to existing residential septic system. A 42-foot <br /> leach line and three 36-inch diameter by 25-foot deep seepage pits were added <br /> to the existing system (15737). <br /> • April 2016 permit for new septic system at residence. The system utilized a <br /> 1,200-gallon septic tank, three 40-foot leach lines, and three 36-inch diameter by <br /> 25-foot deep seepage pits (15300). <br /> • April 2016 permit for new septic system at residence. The system utilized a <br /> 1,200-gallon septic tank, two 40-foot leach lines, and two 36-inch diameter by 25- <br /> foot deep seepage pits (15312). <br /> • October 2019 permit for septic repair at east barn (15757). (The permit is too <br /> recent to be available from the San Joaquin County Environmental Health <br /> Department website.) <br /> The first 11 of these permits have been included in Appendix 4 of this report. <br /> Existing Septic Tank Usage in the Vicinity <br /> To estimate the septic system usage in the area, our office counted septic systems that <br /> exist within approximately four square miles surrounding the property. Air photo <br /> imagery from Google Earth was used. Each building cluster on the photo was assumed <br /> to have one septic system. Using this method, it is estimated that at least 18 septic <br /> systems per square mile are located in the immediate vicinity of the Site. <br /> The area surrounding the Site consists of mostly of orchards, vineyards, pasture, and <br /> rural residences. Ponds operated by the Lockeford Community Services District are <br /> located approximately one-third of a mile northwest of the Site. <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, most septic systems in the area utilize leach <br /> lines and seepage pits. The septic permits can be found in Appendix 4 of this report. <br /> LOGE 1943 Page 3 <br />