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December 1986 <br />11 • <br />863-2052 <br />TABLE 3: DISTRIBUTION OF LITHOLOGIES IN OVERBURDEN <br /> Average Percentage <br /> Cumulative of Total <br />Classification Thickness Thickness <br />Wadge Overburden <br />Sandstone 60 75 <br />Mudstone 20 25 <br /> 80 100 <br />{Volf Creek Overburden <br />Sandstone 80 ~ 49 <br />Siltstone 55 33 <br />Mudstone 30 18 <br />165 100 <br />While the amount of individual lithologies will vary depending on <br />the location and overburden thickness, Table 3 is believed to <br />provide a reasonable estimate of typical distributions of lith- <br />ology. <br />Since there is no indication of gross changes in material charac- <br />teristics below the Wadge, we believe that the spoil resulting <br />from the Wolf Creek overburden will have generally similar <br />characteristics to that which, is produced by the Wadge over- <br />burden. In our experience, the mechanical characteristics and <br />performance of spoil are considerably less sensitive to varia- <br />tions in geology than are the rock mass properties which control <br />the stability of slopes in bedrock. Because of this, we do not <br />anticipate that the greater percentage of shale (siltstone/mud- <br />stone) in the Wolf Creek overburden will significantly affect the <br />performance of the resulting spoil materials. <br />Golder Associates <br />