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• Past Uses of the Site Based on information reviewed for the Surface & Subsurface Contamination Report (Live Oak, 2015), the Site has been used for agriculture since 1940 or earlier. The Site has been used for asparagus, row crops, fodder crops, orchard, and vineyard. Most of the structures on the Site date to the 1930s through 1960s. Existing and Proposed Septic Tank Usage Existing Septic System According to the tentative parcel map (Wong Engineers, 2015), one septic system is currently located on the Site to serve the restroom building. Other systems are clearly present, but their locations are unknown. Proposed Septic System Mr. Marchini indicated that no new construction is planned for the Site. On-Site Septic Permit History Three septic system permits for the Site were identified at the San Joaquin County Environmental Health Department. • • August 1966 permit for new septic system at four-bedroom house. The system utilizes a 1,500-gallon tank and three 100-foot leach lines. A well is depicted to the east of the house (9000 W. Howard; location unclear) • August 1968 permit for permit for replacement of 1,200-gallon septic tank and 60-foot leach line at one-bedroom house (9000 W. Howard; may refer to one of the mobile homes in the southeast corner of the Site; shows a well and ditch nearby). • June 1980 permit for septic system at three-bedroom house. The system utilizes a 1,200-gallon tank and three 60- or 90-foot leach lines. The permit indicates that the domestic well is one-half mile away (9000 W. Howard). Based on roads drawn in the sketch, this permit may refer to a location off-site to the east. Copies of the permits have been included in Appendix 4 of this report. Existing Septic Tank Usage in the Vicinity To estimate the existing septic system usage in the area, our office counted septic systems that exist within approximately nine square miles surrounding the property. Aerial imagery from GoogleEarth was used. Each building cluster on the photograph was assumed to have one septic system. Using this method, it is estimated that four or more septic systems per square mile are present in the immediate vicinity of the Site. • LOGE 1523 Page 2