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<br />Soil material was left in a rough condition until final seedbed preparation <br />occurred. Leaving the material in a rough condition should aid in reducing <br />erosion potential on reclaimed azeas. Tracks lefr by scrapers may also aid in <br />reducing erosion by slowing the velocity of overland flow. <br />Final seedbed prepazation for all sites involved chisel plowing and the <br />establishment of contour furrows. Chisel plowing aids in relieving compaction <br />and increasing water infiltration. Establishment of contour furrows will reduce <br />surface water flow velocities and decrease the potential for erosion. Soil <br />amendments will be applied as required. Implementation of these measures <br />should provide for an effective, adequate seedbed. <br />V. Sealing of Drilled Holes and Underground Openings <br />1. The Division will require that each hole, well or other underground opening be <br />capped, sealed, backfilled, or otherwise properly managed (4.07.3). <br />VI. Use of Explosives <br />1. The applicant proposed to conduct blasting operations in the surface mine azea. <br />According to Map No. 6, Mine Plan, no potentially sensitive facilities aze within <br />500 feet of the blasting azea. The applicant used a previously CMLRD approved <br />scaled distance formula to determine explosive weight and associated blast hole <br />spacing (see Exhibit 21, Volume 3 of permit application). <br />The applicant stated that the number of blast holes per delay would be limited <br />by the modified scaled distance equation so that the peak particle velocity did <br />not exceed the limit of 1 inch per second. All warnings and access regulations <br />were implemented by the applicant. All blasting was conducted as announced in <br />the blasting schedule. A record of blasting design and of each shot was kept at <br />the mine office. <br />The Division finds that the blasting plans in the Mine No. 3 permit application <br />conform with the requirements of this section. <br />2. The mine is now reclaimed; therefore, all blasting activities have permanently <br />ceased. <br />VII. Disposal of Excess Spoil <br />1. One permanent overburden pile exists at the south end of the mine. The pile <br />was completely constructed prior to enactment of the Permanent Colorado <br />Program. As such, the pile construction was exempted from the requirements of <br />4.09.1. Specific documentation regazding this exemption is located at Exhibit 26 <br />of the permit document. The operator remains responsible, however, for <br />achievement of successful revegetation of the pile, according to the requirements <br />of current regulations. <br />16 <br />