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. Three revisions were submitted to the Division and approved on January 24, 1983, August <br />17, 1983, and April 24, 1990 respectively. These revisions clarified the overburden sampling <br />programs to be carried out in the pit and on the regraded overburden areas. <br />The current overburden sampling program establishes the following items: <br />The location within the active pit and regarded spoil areas from which <br />overburden samples will be taken. <br />2. The frequency of the overburden sampling; <br />3. Suspect levels ofthe parameters to be analyzed; and <br />4. Remedial measures to be taken if the suspect levels of the parameters are <br />encountered. <br />For further information regarding the overburden sampling program, refer to Exhibit 6 - <br />Geological Information. The results of the sampling program can be found in the 1983 - 1989 <br />Annual Reclamation Reports. <br />Based on the data collected over the seven year period, Colowyo submitted a Technical <br />Revision on February 26, 1990 to focus overburden monitoring and sampling to those <br />materials identified as most suitable and therefore, actually utilized on the final grade of the <br />reclaimed surface. <br />After removal of the overburden, the coal seams are exposed. As the coal seams are exposed, <br />they are cleaned using auxiliary equipment then either drilled and shot with explosives or <br />ripped to prepare the coal for loading and removal. <br />When explosives are needed, the drilling is performed by an auger drill. The drilling pattern <br />is in the range of l2 feet by 12 feet, but is dependent upon the actual coal seam thickness. <br />Drill holes are loaded with either ANFO or a waterproof explosive, if the holes are wet, to a <br />typical powder factor of about 0.2 pounds per ton. <br /> <br />2.05-9 <br />