2018-07-09_GENERAL DOCUMENTS - C1981019

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Proposed Decision and Findings of Compliance July 2018 Permit Renewal No. 7 P a g e | 43 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 PAP. The PAP provides typical blasting patterns (Maps 26, 26A, 26B and 27). 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 PAP. A pre-blast survey was conducted on January 10 and 11, 1991 (date of report 19 February 1991). Durnham Ranch dwellings are located within one-half mile of the permit area. There are several additional structures that required a pre-blast survey for PR-02. 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 1.75 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 August 9, 2007 and 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 PAP. The 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 the East Pit was placed in the Streeter valley fill. Now complete, Streeter fill contains approximately 47 million cubic yards of excess spoil fill. The Section 16 fill, also complete, contains approximately two million cubic yards of excess spoil fill. The West Pit fill, also complete, contains approximately 19 million cubic yards of excess spoil fill. Grading activities are still being performed in the West Pit fill. The East Taylor Fill and the West Taylor Fill contains the initial box-cut material from the South Taylor Pit. The approximate design volumetrics associated with these fills are as follows:  The permanent East Taylor Fill - 20 million cubic yards  The temporary East Taylor Fill - 39 million cubic yards  The permanent West Taylor Fill - 28 million cubic yards  The temporary West Taylor Fill - 12 million cubic yards. Specific information on the Streeter Fill can be found in Exhibit 12 of the PAP 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 PAP 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 4.09.1 and 4.09.2.