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Past Uses of the Site <br /> Based on information reviewed for the Surface & Subsurface Contamination Report <br /> (Live Oak, 2014), portions of the Site have been used for irrigated agrculture since 1952 <br /> or earlier. Many of the structures on the Site are approximately 100 years old. <br /> Existing and Proposed Septic Tank Usage <br /> Existing Septic System <br /> According to Paul Calosso, three septic systems are currently located on the Site, one <br /> for each house and one for the office. <br /> Proposed Septic System <br /> Paul Calosso indicated that no new construction is planned for the Site. <br /> On-Site Septic Permit History <br /> Two permits related to septic systems for the Site were identified at the San Joaquin <br /> County Environmental Health Department: <br /> • July 1972 permit for 1,200-gallon replacement tank and addition of one 50-foot <br /> leach line and two 33-inch diameter by 25-foot deep seepage pits at existing 03 0,J <br /> residential system (southern residence). <br /> • February 1975 permit for addition of 40-foot leach line and 33-inch diameter by <br /> 25-foot deep seepage pit to existing system at mobile home (current location of <br /> small office, per Paul Calosso). <br /> These permits are 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 nine square miles surrounding the property. <br /> Aerial imagery from GoogleEarth was used. Each building cluster on the photograph C <br /> was assumed to have one septic system. Using this method, it is estimated that one or <br /> more septic systems per square mile are present in the immediate vicinity of the Site. <br /> The general area consists of pastureland and vineyards with occasional rural <br /> residences. <br /> LOGE 1419 Page 2 <br />