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• For information regarding these monitoring requirements, refer to the 1983 - 1989 Annual <br />Reclamation Reports. <br />The following is the original narrative from the original application under Section 2.06.2, <br />Experimental Practices Mining for the Streeter Fil] to be permitted as an Experimental <br />Practice. <br />On September 4, 1979, Colowyo applied for a permit allowing the company to engage in an <br />experimental practice for the construction of a spoil fill area within the permit boundaries. A <br />copy of this application is set forth in Exhibit 12, Experimental Practice Infotmation. The <br />information contained in this section summarizes the need for an experimental practice and <br />the ability to achieve environmental protection that is equal to or greater than that required by <br />the performance standards of Section 4.09 for excess spoil. <br />Spoil from the initial box cut for mining south of Streeter Draw will not be required to <br />achieve the approximate original contour within the area where overburden has been and will <br />be removed. The location of the fill (Streeter Fill) is shown on the Existing Structures -South <br />Map (Map 12). The planned final topography following mining is shown on the Post-mining <br />Topography Map (Map 19), with the area on the map that comprises the Streeter Fill being <br />that area to the north and east of the line on the map that outlines the area to be mined. The <br />fill design is shown on the Fill Design -Experimental Practice Map (Map 30). <br />Backeround -Streeter Fill <br />• Prior to the startup of mining operations at Colowyo, several geotechnical engineering <br />studies concerning the spoil material were undertaken for the mine site. This work was used <br />to evaluate and ensure stability of the backfilled material and fill areas. Exhibit 23, <br />Experimental Practice Information, contains the following studies developed for spoil <br />stability prior to mining: Report on Preliminary Design of Open Pit Slopes (April, 1975), and <br />Report on Preliminary Design of Waste Dumps (November, 1975). <br /> <br />2.06-3 <br />