2009-09-14_REVISION - C1981019 - Laserfiche WebLink

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Details are found beginning on page 2.05-58 of the Permit. Monitoring wells will be fitted with temporary caps. Holes dug to aquifers will be sealed with cement or other suitable sealant to within ten feet of the surface. VI. Use of Explosives - Rule 4.08 The Permit is found to be in compliance with the requirements of Rule 4.08. The blasting plan is found in Section 2.05 and in Section 4.08 of the Permit. The Permit provides typical blasting patterns (see 2.05-28 and Maps 26 and 27 of the Permit). Blasting patterns specific to each blast are recorded on the individual blasting records (Rule 4.08.5). A description of the explosives storage facility is presented in Exhibit 16 of the Permit. Durnham within ogle-hall t i mile _ othe r • 1-1 _ n rnCll i- UWe1 - -?'1illg-- are located permit area. A pre-Dlasl surve Aay Was conducted on January 10 and 11, 1991 (date of report 19 February 1991). There are several additional structures that required a pre-blast survey for Permit Revision 02. These structures are the Tri-State Generation and Transmission Association 345 kV power lines are within 1,000 feet of the box-cut for the South Taylor Pit. Eight poles over a distance of 1-3/ miles were surveyed. A residence, the Paul Routsen residence at 6647 and 7072 Moffat County Road 51, was also surveyed. This residence is approximately 5,000 feet from the South Taylor Pit. These surveys were conducted on 9 August 2007and are contained in Exhibit 14 of Volume 13 of the PAP. VII. Disposal of Excess Spoil - Rule 4.09 The Permit is found to be in compliance with Rule 4.09. Information on excess spoil waste can be found in Sections 2.05 and 4.09 of the Permit. Colowyo Mine currently has five approved excess spoil fills: the Streeter Fill, the West Pit Fill, the Section 16 Fill, the East Taylor Fill and the West Taylor Fill. Overburden material from the initial box cut for beginning the East Pit was placed in the Streeter valley fill. Now complete, Streeter Fill contains approximately 54 million cubic yards of excess spoil fill. Capacity of the West Pit fill is 16.5 million cubic yards and capacity of the Section 16 fill is 1.5 million cubic yards. The East Taylor Fill and the West Taylor Fill will contain the initial box-cut material from the South Taylor Pit. The East Taylor Fill will have a capacity of approximately 50 million cubic yards and the West Taylor Fill will have a capacity of approximately 10 million cubic yards. Specific information on the Streeter Fill can be found in Exhibit 12 of the Permit and in Section B, Item V of the original findings document. Specific information on the West Pit and Section 16 fills is presented in Exhibit 19 of the Permit and in the files for revision PR-01. The fills meet the regulatory definition of valley fills and therefore must meet the regulatory requirements of Rules Proposed Decision and Findings of Compliance 14 September 2009 Permit Renewal 05 Page 50