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C o Ambient,4ir Report for H-G Coal Company <br />By: Environ-Test Ltd. <br />P. O. Box 15325 <br />Lakewood, Colorado 80215 (303) 233-4082 <br />Date: May 1, 1977, April 30, 1978 <br />o Sediment Control Plan H-G Coal Company <br />By: Morrison-Knudsen <br />Date: May, 1980 <br />o Water Quality Study for H-G Coal Company <br />By: Enviro-Test Ltd. <br />.Date: September 28, 1978 <br />__ • <br />o Ground Water Surface Water and Soils Studies for W. R. Grace V <br />and Company, Hayden Gulch Project <br />By: Morrison-Knudsen <br />Date: June, 1980 <br />- o Baseline Biological Inventory <br />By: 3R Corporation <br />Date: Jurte, 1977 <br />o Soil and Foundation Investigation and Percolation <br />Test by: Chen and Associates <br />Date: June 19, 1978 <br />• <br />