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• The filtered scrubber sludge is a waste product (primarily gypsum) from the wet limestone scrubbers that are <br />used to reduce sulfur dioxide emissions to the atmosphere. <br />Miscellaneous non -hazardous solid wastes that are periodically co -managed for disposal with fly ash, bottom <br />ash and scrubber sludge include, but are not limited to, cooling tower sludge, decant basin sludge, <br />concentrator sludge, coal rejects, baghouse and dust collector fitters, grit blasting residue, rubble, soil and <br />refractory. All miscellaneous solid wastes are tested to ensure that they are non -hazardous before being <br />placed in mine pits. <br />Amounts <br />It is anticipated that a maximum of 5,250 tons per day of utility wastes will be disposed of at the Trapper <br />Mine. However, on the average, only about 1,222 tons per day are expected. <br />Handling of these wastes will require the transport of up to 6,500 cubic yards per day with 1,513 cubic yards <br />per day the expected average. This would produce an average annual volume of waste of about 231 <br />acre-feet after compaction occurs during covering. Blending of the wastes will not significantly reduce <br />volumes for disposal (Radian, 1981). For example, assuming a 30 year generating plant fife and an average <br />depth of 25 feet in the mine area, approximately 277 acres of mine would be required to dispose of the total <br />expected quantity over the life of the plant. However, actual disposal is expected to occur over various <br />• portions of the mining area. <br />Chemical and Physical Characteristics <br />Predictions of the chemical and physical characteristics of the waste products and overburden are required to <br />provide a preliminary evaluation of the environmental impact of the disposal and to evaluate disposal options <br />available for mine disposal. These predictions are based mainly on the results of laboratory testing of actual <br />waste products generated from the test bum at the Hayden Station using run of mine coal from Utah <br />Intemationars Trapper Mine. Some of the analytical data including that of limestone and make up water <br />composition were supplied by Colorado -Ute and are documented in a study performed by Radian (Grimshaw, <br />1978). The chemical and physical characteristics of the overburden are essential in interpreting the <br />interaction of the mine overburden with the Craig Station combustion products. <br />428 <br />Revision: r+Q-11-7 <br />Approved: FEB 2 1999 <br />