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J. H.-KLEINFELDER & ASSOCIATES File No. 5-2490-1 _ <br /> December 8, 1980 <br /> PAGE 2 <br /> The soil conditions encountered in the two borings consist <br /> of brown to tan sandy silts that extend from the surface to <br /> approximately 10 feet. Underlying these soils , tan silty clay <br /> was encountered extending to the maximum depths explored. <br /> Ground water was encountered at approximately 11 feet in <br /> Boring No. 1 and 12 feet in Boring No. 2. The two borings <br /> were left open for future ground water monitoring, as ground <br /> water conditions at the site could vary at some time in the <br /> future, due to various reasons. More detailed descriptions <br /> of the soils encountered in the borings are shown on the <br /> Logs of Borings, Plates II and III of this report. All soils <br /> are classified according to the Unified Soil Classification <br /> System, which is described on Plate I. <br /> The percolation test holes were drilled to depths of <br /> from approximately 3 to 4 feet deep with two test <br /> _ holes adjacent to each boring. After drilling, 4-inch <br /> diameter perforated plastic pipe was installed and the holes <br /> were presaturated. <br /> The percolation tests were performed on December 2 , 1980, <br /> in general accordance with the suggested procedures of the <br /> U. S. Public Health Service- A head of approximately 12 inches <br /> of water was maintained above the bottom of the test holes. <br /> The soils encountered at the depths tested consisted of san' dv_ <br /> silts. A summary of the results are shown on Plate IV. <br /> The results of our percolation tests- indicate that the <br /> subsurface soils, particularly in the race track area, have <br /> low to medium percolation characteristics. Based on the results <br /> of our soil borings and the high ground water table, there <br /> does not appear to be a particular soil layer .t1Y t would be <br /> more suitable for sewage disposal. - <br />