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July 15. 1996 -2- 963-2027.008 <br />After remolding, the samples were placed in a freezer. A sacrificial sample was used to <br />monitor sample temperamres. The sacrificial sample was identical to the test samples, <br />except the sacrificial sample had two holes drilled into the side of the cylinder, <br />perpendicular to the cylinder's long axis. The holes extended to the middle of the sample, <br />and were approximately three inches apart. One hole had a temperature probe stationed <br />continuously in the sample with the temperature recording device outside the freezer. The <br />temperature was measured hourly using a data logging thermometer. The other hole was <br />taped closed and temperatures were measured hourly. For each freezing cycle, the <br />samples were left in the freezer for twenty-four hours. The sacrificial sample reached <br />freezing [emperatures (below 32 degrees Fahrenheit) in approximately five hours. After <br />the twenty-four hour freezing period, the samples thawed at room temperature for twenty- <br />four hours. The sacrificial sample reached room temperature in approximately four hours. <br />The temperature of the sacrificial Soil Liner Fill sample as a function of time for the first <br />freeze/thaw cycle is summarized in Table 1. <br />Once the specified number of freeze/thaw cycles were complete for a particular sample, the <br />mold was split open, and one half of the 12 inch sample was selected for flexible wall <br />permeability testing (ASTM D-5084, Method D). A summary of the average permeability <br />for each Soil Liner Fill material is presented below. <br />Material Type Number of Freeze/Thaw <br />Cycles Mean Pertrteability <br />(cm/sec) <br />SLC-29 0 6E-09 <br /> 3 1E-08 <br /> 5 7E-09 <br />Ironclad 0 3E-08 <br /> 3 4E-09 <br /> ~ 8E-10 <br />Permeability of the three Ironclad samples subjected to zero freeze/thaw cycles ranged <br />from 6x108 cm/sec to 1x10-8 cm/sec, with an average permeability of 3x108 cm/sec. <br />Permeability of the three Ironclad specimens subjected [o three freeze/thaw cycles ranged <br />from 5x10-§ cm/sec to 4x10-9 cm/sec, with an average permeability of to 4x10-9 cm/sec. <br />Permeability of the three Ironclad samples subjected to five freeze/thaw cycles ranged from <br />3x10-10 cm/sec to 6x10-9 cm/sec, with an average permeability of 8x1010 cm/sec. While <br />the test data suggests that a decrease in permeability may be expected as the number of <br />freeze/thaw cycles increases, this finding may be partially the result of variations in <br />compac[ion and moisture content of the Ironclad samples. However, as a general <br />conclusion, it appears that there is no increase in the permeability of the Ironclad material <br />after five freeze/thaw cycles. Table 2 presents the permeability test summary, and <br />Attachment B presents permeability test data. <br />Golder Associates <br />