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<br />-8- <br />Conveyors: Test Holes 7, 12 and 13 were drilled along the conveyor <br />alignment. For supports ad)acant to the structure, the soils will be <br />similar to those discussed above. Away from the structure, the test <br />holes showed 7 to 10 feet of stiff clay overlying claystone bedrock. <br />Free water varied from depth 6 to 11 feet six days after drilling. <br />Haul Road AllSnment: Test Holes 20 and 21 were drilled in areas of <br />probable deep cuts to Investigate potential excavation and slope stability <br />conditions. Subsoils encountered consist of approximately 2 feet of <br />medium dense, clayey sands and gravels, and 5 to 6 feet of stiff, weathered <br />claystone overlying medium hard bedrock. Bedrock appears io be Jointed <br />and fractured similar to that encountered throughout the processing <br />facility area. <br />• <br />FOUNDATION RECOMMENDATIONS <br />Several types of foundations era feasible for the proposed construc- <br />tlon..for the most part where bedrock Is shallow, either high pressure <br />spread footings or straight-shaft piers drilled into bedrock are recom- <br />mended. In areas where swell potential is low and structures are able <br />to sustain some differential movement, moderate pressure spread footings <br />bearing on the upper clay soils can be considered. <br />Straight-shaft pier foundations would be suitable for all above- <br />ground structures and would havn the advantage of a uniform bearing <br />stratum and the development of skin friction to resist uplift forces. <br />Truck Dump: Essentially, all overburden clay soils will be cemoved and <br />. claystone will be exposed throughout the entire excavation depth and at <br /> <br />l <br />1 <br />1 <br />...; <br />7 <br />_~ <br />:, <br />9 <br />