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• similar equipment by reexcavating spoil material in an area that has been previ <br />ously mined but not yet reclaimed. <br />As stated previously, Radian evaluated the first three types of disposal sites and found them to be acceptable <br />given certain criteria are followed (refer to Section 4.3.4.6). The fourth type of site, spoils pond disposal, can <br />be assumed to be acceptable also because it is almost identical to pit bottom disposal and <br />would have the same potential environmental impact. <br />It is projected that any active or inactive pit may be used as disposal sites. Map M47a shows typical utility <br />waste disposal sites for this permit term as well as historical waste disposal sites. Trucks will be loaded at <br />the Craig station and will transport the utility wastes to the appropriate disposal site. At the disposal site, the <br />truck will dump its load and return to the Craig Station for another load (refer to Figure 4.3-3). A dozer will be <br />used to maintain the disposal site and level the wastes after dumping (refer to Figure 4.3-4). No utility wastes <br />will be disposed of at the north end of each pit that may be in contact with ground water. The expected <br />extent and location of each pit cut during the proposed permit period is shown in detail on Map M10A series <br />for the permit term. The criteria for determining acceptable disposal sites within pits are described in Section <br />4.3.4.6. <br />4.3.4.6 Probability and Control of Impacts <br />• The key issue for utility waste disposal at Trapper Mine is the potential for ground water contamination to <br />result (Radian, 1981). Conceptually, the evaluation of the feasibility and impacts of utility waste disposal <br />attempted to answer the following questions: <br />U <br />1) What potential is there for a leachate to occur from the wastes? <br />2) What would be the characteristics of a leachate if it occurred and would there be adequate attenuation of <br />the species in the leachate as it moves through the overburden? <br />4-42 199$— <br />