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t The subject property is located 5 miles south of the town of Lockeford, and 10 miles east of Lodi. The study area consists of predominately agricultural production land, primarily range land, vineyards, and orchards. Surrounding structures consist of very low density single family housing, a dairy ranch and ranchettes. Current zoning of the property is AG-40. A review of Application Permits on file with the San Joaquin County Environmental Health Department indicates there have been four Applications for Repairs/Additions in the one mile diameter study area. These applications for system modifications to existing systems were for additional drainage(leachlines)and seepage pits. This can be considered an upper-medium number of Applications considering the low density housing in the area and indicates the soil may not necessarily be conducive to acceptable sewage effluent management. The closest Well Driller's Logs that were on file at the Environmental Health Department shows some varied soil strata of sand and clay down to 240 feet in depth. [3] SOIL PROFILE AND PERCOLATION TESTING A shallow percolation test(46 inches)was performed on Parcel 1 on September 22, 1999. No perc test was done on the Designated Remainder. The test procedure was conducted according to San Joaquin County Department of Environmental Health regulations. The test location was directly east of the house and is illustrated on the attached Site Plan. The Field Test Data Sheet with the percolation test result can also be found in the Appendix. The percolation test boring was composed of a silty fine compacted sand down to 24 inches,and then a medium-to-coarse sandy clay(SM-ML, SC)down to 46 inches. This is the depth where effluent percolation would normally take place from a leachline. After boring the perc hole, smeared soil surfaces were opened with the teeth of the auger. No hardpan or other type of restrictive layer was encountered in the test boring. The final perc rate obtained after the four-hour test period was 24 minutes per inch (min/in). The passing percolation rate obtained from the perc test can be primarily attributed to the coarse sand within the clay soil. Since the groundwater is deep in this locale, seepage pits are allowed and are almost always installed. The subject property soils possess percolative capacity at shallow depths,although as the soil at leachline depth becomes increasingly saturated, percolation is restricted. [4] LOCAL GROUNDWATER AND SURFACE WATER INFORMATION The static water table depth, or the zone of saturation is located at approximately 135 feet below grade according to the 1997 "Lines of Equal Depth" published by the San Joaquin County Flood Control District. There is a slight possibility that there may be perched water table conditions under the subject property at a higher elevation that the static water level. There is no potential for future septic impact to any surface waters, providing applicable distance requirements are followed. 2 Vafley Ag Research