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[21 Cont. 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 radius study area. These applications for system modifications were a sump and a pit, along with additional drainage to existing systems. Also, two well logs were reviewed which illustrate the deep subsurface soil strata. 131 PROPOSED DEVELOPMENT OF THE SUBJECT SITE As referenced, it is proposed to divide a 203-acre parcel into three-10 acre parcels and a Designated Remainder of 173 acres. It is our understanding there is to be no development or improvements made to any of these parcels in the future, and it may be several years before development is initiated. All proposed septic system structures and the domestic well must comply with the published "distance" requirements. [41 SOIL PROFILE AND PERCOLATION TESTING The predominate soil type from grade to 10 ft is a silty, fine-to-medium sand in the north half of parcel 3. Toward the south of Parcel 2 and parcel 1, the soil becomes noticeably "heavier." The sand content of the soil decreases with depth, to a medium silty-sand, sandy-silt at boring termination. A hardpan layer was not encountered in the drilling procedures. Each of the three pert test borings on parcels 1, 2 and 3 were set at four feet below existing grade to illustrate the depth effluent percolation or the "wetting front" will occur in native soil. Per the Environmental Health Department, a perc test was not done on the Designated Remainder. From the perc test results, it was determined this four-foot depth produces acceptable percolation rates. Our percolation tests were conducted according to San Joaquin County Department of Environmental Health regulations. The Field Test Data Sheets with the percolation test results can be found in the Appendix. The perc rates obtained illustrate very clearly the change in soil structure. Due to the favorable perc rates at these depths, deeper perc tests were not performed. A discussion of these rates, and septic system design recommendations will follow in the Conclusions section of this report.