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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, primarily rice, since 1952 or <br /> earlier. The house on the Site was built approximately 10 years ago, the Quonset but <br /> was built in the 1990s, and the rice dryer was built in the 1 <br /> ry 950s, according to interviews <br /> conducted for that report. <br /> Existing and Proposed Septic Tank Usage <br /> Existing Septic System <br /> One septic system is currently located on the Site to serve the house. <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 <br /> addresses. <br /> • October 2007 permit for new residential septic system. The system utilized a <br /> 1,600-gallon septic tank, two 60-foot leach lines, and three 36-inch diameter by <br /> 25-foot deep seepage pits (26050). <br /> This 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 located within approximately one square mile surrounding the property. Aerial <br /> imagery from Google Earth was used. Each building cluster on the photograph was <br /> assumed to have one septic system. Using this method, it is estimated that 25 or more <br /> septic systems per square mile are present in the immediate vicinity of the Site. <br /> The general area consists of orchards, agricultural land, and rural residences. Several <br /> cattle facilities are in the area as well, including two within one-third of a mile of the Site. <br /> • <br /> LOGE 1834 Page 2 <br />