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Existing and Proposed Septic Tank Usage Existing Septic System One septic system is currently located on the Site (Plate 2); it serves the existing residence. Proposed Septic System A new septic system will be constructed to serve the new house. On -Site Septic Permit History The San Joaquin County Environmental Health Department septic permit files were searched for the Site address. Three septic permits were identified: • August 1964 permit for new septic system at residence. The system utilized a 140 -foot leach line. This permit appears to refer to the adjacent house to the east. • March 1978 permit for addition to septic system at residence; a 70 -foot leach line and a 33 -inch diameter by 25 -foot deep seepage pit were added to the existing system. This permit appears to refer to the adjacent house to the east. • April 1996 permit for new septic system at residence. The system utilized a 1,600 -gallon tank, three 40 -foot leach lines, and three 36 -inch diameter by 25 - foot deep seepage pits. This permit refers to the subject Site. These permits have been included in appendix 4 of this report. Existing Septic Tank Usage in the Vicinity To estimate the septic system usage in the area, our office counted septic systems that exist within approximately one square mile surrounding the property. Air photo imagery from Google Earth was used. Each building cluster on the photo was assumed to have one septic system. Using this method, it is estimated that at least 29 septic systems per square mile are located in the immediate vicinity of the Site. The area surrounding the Site primarily consists of vineyards with rural residences along the roadways. A residential neighborhood with smaller lots is located approximately one-half mile west-northwest of the Site. Several wineries are located in the area as well. LOGE 2212 Page 2