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wAmw `/ r7tis unknown if the City of Lodi will extend services north to this locale and provide water and sewer, although it may be a possibility in a few decades. This premise is based upon the General Plan indicating housing up to the south side of the Mokelumne River, which is approximately two miles south of the subject property. Applications on file with the County Environmental Health Department reveal that there have been 13 permits issued for repairs/additions to existing systems in the one-half mile radius study area. Additions were primarily for leachlines and sumps installed many years ago. This can be regarded as a high number of repairs/additions and can probably be attributed to poor soil conditions and undersize systems. B. SOIL PHYSICAL CHARACTERISTICS AND ANALYTICAL TEST RESULTS The project site has level terrain; consequently, there will be no need to incorporate septic system design considerations for slopes. This would include septic effluent pump dosing or "stairstepping" leachlines. The United States Department of Agriculture-Natural Resources Conservation Service (USDA-NRCS) indicates most of the on-site soils to consist of Kingdon fine sandy loam (#189), with the southwest corner of the property composed of Tokay.fine sandy loam(#256). The Soil Survey information says the Kingdon fine sandy loam has moderate permeability, while the Tokay soil has moderately rapid permeability. As noted in the next Section, shallow percolation tests were done in both soils. These tests revealed dramatically differing results between the two soil types. The Tokay soils had a nonexistent percolation rate,while the Kingdon soil possessed an excellent percolation rate. Since the soils are similar in structure according to the NRCS soil survey, it may be theorized that compaction from semi-truck tandem wheels have contributed to the nonexistent permeability in the Tokay soils, where there had been truck parking. Vertical stresses from semi trucks on the soil are calculated below, and discussed in the next Section: Tandem axle, fully loaded= 35,000 lbs Weight on soil from one set of duals = 17,000 lbs Area of weight 2 sq ft Therefore, load 85 kips/ft(8,500 lbs/ft) DEPTH DEPTH AS VERTICAL STRESS VERTICAL STRESS RELATED TO FACTOR WIDTH 42 inches(3.5 ft) 3.5 ft:2 sq ft 0.175 q (q=8,500 lbs/ft) 0.175 X 8,500 LBS/FT= 1500 LBS/FT @ 3.5 FT From the data presented above, it is calculated that each wheel is applying approximately 1500 lbs/ft, or 75%of a ton, at 3.5 feet depth. Under near ideal moisture conditions, this would have a compactive effect on the underlying soil. This effect from dual truck wheels may be contributing to 3 Chesney Consufting