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J � The subject property is located 8 miles northwest of the town of Escalon and 16 miles southeast of Stockton. The study area consists of predominately agricultural production land, primarily alfalfa and forage crops, orchards, dairies and vineyards. Surrounding structures consist of very low density single family housing, ranches 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 seven Applications for Repairs/Additions in the one-half mile diameter study area. These applications for system modifications to existing systems were for additional drainage(leachlines) and seepage pits or sumps. This can be considered a high number of Applications for the study area and indicates the shallow soil in the area may not be conducive to acceptable management of sewage effluent. In addition to the application permits, Well Driller's Logs were also reviewed. Five of the closest logs available that were on file at the Environmental Health Department show a varied soil strata of clay, gravel and sand down to 600 feet in depth. [3] SOIL PROFILE AND PERCOLATION TESTING Percolation tests on the six Parcels were conducted according to San Joaquin County Department of Environmental Health regulations and the locations are illustrated on the attached Site Plan. The tests were measured in clockwise order, starting with Parcel 4 and ending with Parcel 2. Since Parcel 3 will become the Designated Remainder, no perc test was conducted on this parcel. The Field Test Data Sheets with the percolation test results can be found in the Appendix. The percolation test borings were composed of a silty, fine sandy clay (CL-ML, SC) throughout the shallow soil profile down to 48 inches. This is the depth where effluent percolation will take place in leachline trenches. After boring each perc hole, smeared soil surfaces were opened with a flat- edge probe, which is the primary reason for the passing perc rates. The borings were pre- saturated 24 hrs prior to starting the perc tests. No hardpan or other type of restrictive layer was encountered in the borings. The following percolation rates were obtained from each Parcel and indicate the soil variability throughout the subject property: Parcel 1: 5 min/in Parcel 2: 15 min/in Parcel 3: 5 min/in Parcel 4: 15 min/in Parcel 5: 6 min/in Parcel 6: 60 min/in To investigate for a comparatively shallow sand strata, a backhoe pit was dug on Parcel 6 where a residential structure may be built. Sand was encountered at approximately 10 feet below existing grade. However, since the groundwater is deep in this locale, seepage pits are allowed and are almost always installed. 0;> Quality �`control Inspection