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• 4.3.4 Utility Wastes <br />Since 1984, utility wastes (fly ash, bottom ash, scrubber sludge and small amounts of other <br />miscellaneous non-hazardous solid wastes) have been hauled by truck from the Craig Station and placed <br />in open pits and depressions of Trapper's mining operations. The wastes are covered as the pits and <br />depressions are filled in. Approval for Trapper to receive these utility wastes was based on the results of <br />a comprehensive evaluation discussed below. <br />In mid-1978, Utah International Inc. established a contrail agreement with Radian Corporation of Austin, <br />Texas, to evaluate the feasibility and impads of ulilrty waste disposal at the Trapper Mine. As a part of <br />this study, samples of ash were obtained from a test bum at the Hayden Station using blended <br />run-of-mine coal from the Trapper Mine. Approximately 8,000 tons of coal were burned during a 38-hour <br />period in March, 1979. Samples of this coal were obtained on an hourly basis during the sampling period <br />and were later composlted for chemical charedefizalion. This approach was necessary because the <br />Craig Station Generating Plant was not operable soon enough to obtain representative samples of waste <br />from lt for input into the study. <br />• The general contusions of this study were as follows: <br />1. During a typical year at the Trapper Mine no leachate will be generated from the proposed waste. <br />Only during the wettest of years will infiltration exceed the moisture storage capacity of the recharge <br />zone and thus establish a potential for infiltrating water to move below the zone of <br />evapotranspiration. Using the previous 35 years of Gimatic history to estimate the proba- <br />• <br />4-24 <br />Revision: ,rl Q - f L ~ <br />Approved: <br />FEB 2 199~y <br />