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[2] Continued. A review of Application Permits on file with the San Joaquin County Environmental Health Department shows there have been two Applications for Repairs/Additions in the one mile radius study area. These applications for system modifications were for additional drainage leach lines to existing systems. Also, a well log is attached which illustrates the deep subsurface soil strata. 131 PROPOSED DEVELOPMENT OF THE SUBJECT SITE As referenced, it is proposed to divide a 2.2-acre area out of a 23.4 acre site to develop a commercial enterprise. It is our understanding this commercial improvement is to be the manufacturing and sales site for enclosed trailers. The owner of this project also owns the properties to the north of the subject site, at 21048 Paradise Road. All proposed septic system structures and the domestic well must comply with the Health Department's published "distance" r, requirements. [4) SOIL PROFILE AND PERCOLATION TESTING The predominate soil type from grade to 8.5 ft is a heavy, tight clay soil. This soil type is found ` throughout this area. There is a color change at approximately three feet from a dark, almost black clay to light brown clay, as the soil increases with depth. Boring termination was at 8.5 feet. A hardpan, or restrictive layer was not encountered during the drilling procedures. .. The perc test boring was set in the location of the proposed effluent disposal field as referenced on the attached site map. The perc test boring was set at 42 inches below existing grade to _ illustrate the depth where the effluent percolation or the "wetting front" will occur in native soil from the leachfields. Our percolation tests were conducted according to San Joaquin County Department of Environmental Health and U.S. E. P. A. regulations. The Field Test Data Sheets with the percolation test results can be found in the Appendix. Due to the heavy clay soil, there was virtually no percolation at all. It is important to note the test procedures were followed very closely to the guidelines set forth by the above agencies. The soil was scarified at the bottom and sidewalls to open smeared soil surfaces. The test boring was presaturated prior to test initiation �- to simulate worst case conditions. A discussion of the perc rates and septic system design recommendations will follow in the Conclusions section of this report. OQ-ahty Control Inspection