2025-06-30_PERMIT FILE - C1981019 (5)

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RULE 4 PERFORMANCE STANDARDS Rule 4 Performance Standards 4-25 Revision Date: 4/9/25 Revision No.: MR-261 Colowyo will not conduct blasting within 1000 feet of any building used as dwelling, school, church, hospital, or nursing facility; and 500 feet of facilities, including but not limited to petroleum or gas storage facilities, fluid transmission pipelines, gas or oil collection lines or water and sewage lines. Distances to various structures of possible concern surrounding the mining area are shown on the Blasting Analysis Map (Map 26A). By employing the design criteria to minimize air blast and ground vibration Colowyo will insure that flyrock, including blasting material traveling along the ground, will not be cast from the blasting vicinity, more than half the distance to a nearby dwelling or other occupied structure and in no case beyond the line of property owned or leased by the Company or beyond the area of regulated access required under Subsection 4.08.4(5). The minimization of flyrock is also important and routinely monitored in order to reduce damage to mining equipment. 4.08.2 Pre-Blasting Survey Upon request to the Division by a resident or owner of a dwelling or structure located within one- half mile of any part of the permit area, Colowyo will promptly conduct a pre-blasting survey. A copy of correspondence advising our neighbors of this. opportunity is provided in Exhibit 14 - Seismograph Measurements, Item 2. A report of the survey will be submitted to the Division and to the person requesting the survey. The pre-blasting survey will assess the condition of the structure or dwelling and document any pre-blasting damage, including any physical factors which might be reasonably affected by blasting. Such a survey will determine only the surface condition of pipes, cables, transmission lines, wells and other water systems; however, special attention will be given to the pre-blasting conditions of wells and other water systems used for human, animal or agricultural purposes and to the quantity and quality of that water. A written report of any pre-blasting survey will be prepared and signed by the person conducting the survey. This report will include any proposed adjustments to the blasting program which might be necessary to be incorporated or should be incorporated to prevent damage. A copy of the report will be provided to the person requesting the survey and to the Division. For properties owned by Colowyo, a pre-blast survey will not be necessary. In a report dated February 19, 1991 Colowyo initiated and reported on a Building Condition Inspection of the Durham Ranch. Although the Durham ranch was located further than one-half mile from the Permit Boundary at that time (approximately 4200 feet) the inspection was nevertheless completed. The Durham Ranch residents were also presented with a copy of the report. On May 20, 1997 an additional copy of the report was presented to the Durhams and also a copy forwarded to the Division. A copy of the May 20, 1997 letter can be found in Exhibit 14 - Seismograph Measurements. 4.08.3 Public Notice of Blasting Schedule The blasting program at the Colowyo operation will involve the detonation of more than five pounds of explosives or blasting agent in all blasts. Colowyo will annually publish a blasting schedule in the local Craig newspaper. A typical blasting schedule published in the local newspaper is set forth in Section 2.05, Figure 2.05-1, Publication of Blasting Schedule.