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17-� <br />n <br />�J <br />File No. 24-2206-O1.A06 <br />January 2, 1991 <br />Coefficient <br />Boring Dec)th of Permeability <br />Sam-cle ft Description k, (cm/sec) <br />KLEINFELDER <br />Moisture % (Pcf <br />B-4 80 Remolded Grey <br />Tan Cemented <br />Silty Clav 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 />Clav 1.0 X 10"0 82 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 low permeabi lities 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 Kleinfelder, Inc. 6 <br />