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County Health records indicate the prior existance of a septic <br /> system on the property. The assumption is made here that this <br /> prior use was most likely for a residential application. <br /> 4. EXISTING AND PROPOSED SEPTIC TANK USAGE <br /> As previously stated, the property is presently vacant, but <br /> according to County Health Department records, a septic system was <br /> located on the western side of the parcel. No record of its <br /> construction were found in the Health Department files; however, a <br /> permit issued in 1979 for the backfilling of an abandoned septic <br /> tank was found. A copy of this permit (#79-210) is included in <br /> the Appendix, as Exhibit A. <br /> A partial investigation of County Health Department records showed <br /> septic systems in existance on the two parcels adjacent to the <br /> east and across Mathews Road at Silva Trucking. The permits for <br /> these systems are included in the Appendix as Exhibits B, C and D. <br /> No records were found to indicate any failure of these three <br /> systems with the exception of the system at 33 W. Mathews. The <br /> permit is for "repair/ addition" of a 25' x 8' filter bed. The <br /> permit was issued 1973, and no records were found to indicate <br /> subsequent failure of the "repairs". <br /> The owners of these properties were not contacted in regards to the <br /> performance of their septic systems. <br /> 5. GdOM WATER DEPTH AND TESTING <br /> Based on the isoheyetal map published by the San Joaquin County <br /> Flood Control Department showing the projected depth to <br /> groundwater for the spring of 1989, the corresponding depth to <br /> water for this parcel's area is between 20 to 30 feet. <br /> There is an existing well onsite which has been abandoned and will <br /> be destroyed under permit as required by the conditions of <br /> approval attached to SA 91-10. No water samples will be taken to <br /> determine water quality as a part, of this study. Limited testing <br /> will be done prior to well destruction. <br /> 6. SOIL TYPE AND PERCOLATION TEST <br /> A percolation test was peformed in the area adjacent to the <br /> proposed drain field. An 8-inch diameter hole was dug to a depth <br /> of 36 inches and the soil type noted. <br /> The soil encountered is a silty fine sand or silty loam. This is <br /> substantiated further by the records of the permits for the other <br /> adjacent systems which describe the soil type as sand, sandy loam and <br /> clay loam (see Exhibits A,B,C and D) . <br /> 2 <br />