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RULE 4 PERFORMANCE STANDARDS <br />Collom – Rule 4, Page 14 Revision Date: 4/20/23 <br />Revision No.: MR-246 <br />4.08 USE OF EXPLOSIVES <br />Explosives will be used for blasting in accordance with the procedures and specifications presented in the <br />Section 4.08 of Volume 1. Map 26A presents distances to various structures of possible concern <br />surrounding the mining area. Only Section 4.08.2 has changed from the Volume 1; see Sections 4.08.1 <br />and 4.08.3 through 4.08.6 in Volume 1. <br />4.08.2 Pre-Blast Survey <br />In accordance with Rule 4.08.2(1), pre-blast surveys will be offered to owners of all structures within <br />one-half mile of the permit area 30 days before initiation of blast activities. Please see Exhibit 14, Item 8, <br />Figure 1 for strutures located within a half-mile of the the permit area. Pre-blast survey offerings will be <br />made to the owners shown on Exhibit 14, Item 8, Figure 1. Should any owner of a structure request a <br />pre-blast survey, the survey will occur prior to commencement of blasting activities, and copies of <br />completed assessments will be included in Exhibit 14, Item 8 after the structure assessments have been <br />completed. All blasting within the Collom area will be conducted in accordance with the blasting <br />parameters described in Volume 1, Section 2.05, Blasting. <br />Blasting Records <br />Colowyo will keep a record of each individual blast by utilizing report formats shown in Volume 1, <br />Figure 2.05-2 - Blasting Report (coal and overburden), and Volume 1, Figure 2.05-3 – Colowyo <br />Chargeweight Sheet (overburden only). <br />Colorado Oil and Gas Registered Facility Locations <br />There are three locations within the permit boundary extension for the Collom Mining Area (Map 11B – <br />Drill Hole Locations) that are identified in the Colorado Oil and Gas Conservation Commission database. <br />They are described as follows: <br />1) ID# 05-081-07203 – Plugged and abandoned oil exploration well. Owned by Infinity Oil & <br />Gas of Wyoming, completed in December, 2004. Plugged and abandoned July, 2005. <br />2) ID# 05-081-06328 – Plugged and abandoned oil expoloration well. Owned by Tiger Oil <br />Company, completed February, 1978. Plugged and abandoned February, 1978. <br />3) ID# 05-081-06339 – Planned oil exploration well location permitted but well was not <br />constructed and the drilling permit was allowed to expire in May, 1978. Owned by Tiger Oil <br />Company. <br />4.09 DISPOSAL OF EXCESS SPOIL <br />Overburden removed from the Collom Pit will be stockpiled out of pit as shown on Maps 23B and 29C. <br />Colowyo expects approximately 20% swell of excavated materials; therefore, part of the material <br />stockpiled in the excess overburden pile will remain out of pit and will also be disposed of permanently in <br />the Little Collom Valley Fill at the conclusion mining as shown on Map 29C. Colowyo expects the <br />excess overburden pile to contain approximately 28 million cubic yards of overburden, with <br />approximately 17,274,124 cubic yards remaining permanently out of pit on the ridge north of the Collom <br />Pit, and approximately 4,103,860 cubic yards of permanent spoil to remain in the Little Collom Gulch <br />Valley Fill. Colowyo expects 6,608,464 cuic yards of the excess overburden will come back to the <br />Collom Pit to fill the final void left from the mining process. <br />Design of the Little Collom Valley Fill is provided in Volume 20 Exhibit 23 Item 3. The excess out-of- <br />pit stockpile and the Little Collom Valley Fill will be reclaimed in accordance with the approved post