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The sediment which may need to be removed from the evaporation ponds may <br /> contain wind blown dust, sodium bicarbonate, and water treatment chemical <br /> residues. The latter are expected to possibly be present in small concentrations and <br /> could include calcium and magnesium sulphates, phosphates and carbonates. <br /> Depending on the concentration of sodium bicarbonate in the sediment from the <br /> ponds, the sediment may be reprocessed for these materials. If the sediment has <br /> low concentrations of sodium bicarbonate, it will be removed by a contract hauler for <br /> disposal at an approved site. <br /> As indicated above, nahcolite mining operations are not designated by the CDMG as <br /> DMOs. However, it is expected that prior to any disposal of the sediment from the <br /> evaporation ponds, the sediment will be analyzed by the Toxicity Characteristic <br /> Leaching Procedure (TCLP) Test to determine if any potentially harmful materials are <br /> present. If these materials are found in regulated levels, they will be disposed in <br /> accordance with the then in-effect regulatory requirements. <br /> Other wastes are expected to include approximately 200 gallons per year of waste <br /> oils and 30 gallons per year of laboratory reagents. These wastes will be placed in <br /> appropriate drums and removed from the project site by an appropriately licensed <br /> contract waste hauler for disposal and/or recycling at an approved facility. <br /> D-7 REFERENCES <br /> Cameron, R.A. November, 1993. Sodium lease renewal and development of nahcolite solution <br /> mining operations. AmerAlia, Inc. letter to W. Hill of the BLM. <br /> Colorado Department of Natural Resources, Division of Minerals and Geology. October, 1995. <br /> Hard rock metal mining rules and regulations. <br /> Colorado Department of Natural Resources, Division of Minerals and Geology. August 11, 1994. <br /> Regular (112) operation reclamation permit application package. <br /> Colorado Department of Natural Resources, Division of Minerals and Geology. July, 1993. <br /> Colorado mined land reclamation act. <br /> Duncan, D.C. 1976a. Preliminary geologic map of Wolf Ridge Quadrangle, Rio Blanco County, <br /> Colorado. U.S. Geol. Survey Misc. Fields Studies Map MF-753. <br /> G:\LMV\A78545.002\Reciamation\Reclamexh.DOC D-53 <br />