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-Y3-~ <br />~) Results of water soluble su'.fate tests performed on soil <br />• samples from file site indicate a lou potential for sulfate <br />attack on Portland cement con~~rete. Concrete exposed to the <br />on-site soils should contain Typr_ II cement and should be air <br />entrained. <br />Deep Foundations: A deep foundation system is recommended for <br />support of the dewatering structure if minor foundation movement <br />is required. The subsoils encountered at the site generally <br />appear to become more granular with depth, Because of the coarse <br />material encountered throughout the soil strata, a heavy steel <br />section "H"-pile or drilled pier will probably be needed. Other <br />types of piling systems may be fe2sible which should be evaluated <br />on an individual basis. We e:tpect tt~e piling or pier will derive <br />. most of the load capacity through skin friction. Static, dynamic <br />and test loading analyses can .:,e used to determine the safe <br />allowable load. We expect that Files will be driven to a speci- <br />fled resistance. Depth of piles or piers may be on the order of <br />30 to 40 feet. Load capacities. of 40 to 60 tons and higher <br />should be possible. If a deep foundation systerti is selected for <br />support of the structure, we should be contacted to provide geo- <br />technical review of selected alternatives. <br />Thickener Structure: We expect the steel tank will be supported <br />on a prepared subgrade and compacted base material. The base may <br />be contained by a concrete ring f;~oting or steel band. Potential <br />differential movement of the tank, primarily due to subgrade <br />wetting, could be on the order cf a few inches wYiich we under- <br />. stand should be tolerable. A lower risk of tank movement can be <br />Chen & Associates <br />