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KLEINFELDER <br /> File No. 24-2206-O1.AO6 <br /> January 2 , 1991 <br /> Coefficient <br /> Boring Depth of Permeability <br /> Sample (ft) Description k, (cm/sec) Moisture (ocf <br /> B-4 80 Remolded Grey <br /> Tan Cemented <br /> Silty Clay 1. 4 X 10-7 <br /> B-6 40 Cemented Clayey <br /> Silt, Very <br /> Sand 3 . 2 X 109 107 79 <br /> B-6 100 Cemented Silty <br /> Clay 1. 0 is 10-' 32 13 <br /> Based upon information from our field investigation and results of <br /> our laboratory tests, it appears that only limited amounts of <br /> potentially suitable silty clay liner material exists within the <br /> Phase I expansion area. This is the brown silty clay or clayey <br /> silt which was encountered in borings B-1, B-3 , B-5 and B-6 at <br /> depths of approximately 15 to 25 feet. The initial permeability <br /> tests completed on samples from the borings did not indicate <br /> sufficiently lcw perleabi lilies to meet the requirements of Chapter <br /> 15. However, it is possible that additional tests on higher <br /> compacted samples with above optimum moisture content may yield <br /> more favorable results. We recommend that additional laboratory <br /> tests be considered if native soils are to be used in liner <br /> construction. <br /> Discussion of Other Lining Alternatives <br /> Soils meeting the Chapter 15 criteria were encountered during our <br /> 1985 study at depths greater than 40 feet in borings outside the <br /> Phase I area. This appears to be consistent with our current study <br /> since most of our samples were taken at depths of less than 30 <br /> feet. However, due to their depth, use of these deeper soils may <br /> not be a viable alternative for Phase I expansion. In addition to <br /> copyright 1991 KLeinfetder, Inc. 6 <br />