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File No. 20-1008-36 May 20, 1996 TABLE IV BARRIER]LAYER PE ABILITIES Permeability No. Northing Easting k(cm/sec) 1 9000 9150 3.4x10-7 2 8975 9275 1.0XI0-4 3 8550 9100 --1—.6—x1_06-7- 4 8750 9200 1.3x10" 5 8425 9450 7.5x10'4 6 8825 9600 4.6x10-' 7 8650 9750 3.3x10' 8 9100 10200 2.4x10' 9 9175 10375 3.4x10- 10 9275 10750 5.9x10-' 11 9490 10275 5.9X10-1 12 9500 9900 7.2x10-9 13 9200 99 7.9x 10' ANALYSIS AND CONCLUSIONS The test pads, which met the IxIO cm/sec permeability requirements using the SDRI, were compacted at 90 and 95 percent relative compaction for red clay mixtures of 30 and 20 percent, respectively, and had an average moisture content of 0.9 percent above the optimal moisture content. Approximately 20 percent of the moisture content tests were equal to or greater than 2 percentage points above the optimum moisture content. The average differential moisture content (moisture content minus optimum moisture content) for measurements less than 2 percentage points above the optimum moisture content was 0.54 percent. The SDRI permeability on the single-lift test pad was approximately 2x10'' cm/sec. The block samples cut from the test pads and tested for permeability in the laboratory(ASTM D-5084) had permeabilities equal to 4x1e, 2x10-7, and 4x10-7 cm/sec. This indicates that for this project, there should be a very close correlation between the actual permeability (as measured by the SDRI) and laboratory pertneabilities (meaning that the laboratory penneabilities give a good indication of what the actual field permeability is). Two hundred eighty-one nuclear density and moisture content tests were performed during the construction of the final landfill cap barrier layer. All of these measurements were greater than or equal to the 90 percent relative compaction standard, with the exception of the relatively flat 20-1008-3&A M960031 Page 6 of 7 01996Kleinfelder,Inc.