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9.8 x 10-~ centimeters per second (cm/sec) to 1.1 x 10.3 cm/sec when measured by water <br />pressure testing in 19 tests. A total of 5 of the 19 tests indicated permeabilities on the order of <br />10.3 and 10-0 which aze not sufficient for an adequate slurry wall key. Tests performed at lower <br />elevations indicated that the massive clayey sandstone /sandy claystone appeazs to be of <br />sufficient low permeability (10"5 to 10"~) for a slurry wall key. It should be noted that for 31 of <br />the 60 water pressure tests, the appazent hydraulic conductivity of the bedrock was below the <br />sensitivity of the water pressure tests, as indicated by no measurable flow or negative flow <br />during the test. Table II presents a summary of the measured hydraulic conductivity for the <br />bedrock. <br />To aid in classifying the bedrock and to determine general bedrock chazacteristics, selected <br />laboratory tests were performed on representative samples; test method references are shown in <br />the following table. <br />Pazameter Method Reference <br />Unconfined Com ressive Stren h ASTM D 2166 <br />-#200 wash ASTM D 1140 <br />Atterberg Limits ASTM D 4318 <br />The test boring reports were amended as necessary to reflect laboratory test data. The results of <br />the laboratory testing are summarized in Table III. Laboratory analysis was performed at <br />Lyman Henn's soil laboratory and by Construction Technical Services, Inc. in Denver, <br />Colorado. Laboratory test results are included in Appendix B. <br />Groundwater in the alluvial aquifer was encountered from 2.0 ft to 14.4 R bgs. Groundwater <br />elevations ranged from 4796.7 ft to 4820.4 ft. <br />G^.PROIECTS\10'!0'.1-000 Wvelavd RcWy Mu Slwry Wall\R. Recordv avd Cortapovdrnce~H.l l Reports\Fwal Shirty Wall Daigv Report dvc <br />