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RULE 4 PERFORMANCE STANDARDS <br />4.05.14 — 4.05.18 Various Topics <br />These sections are addressed in the Volume 1. <br />4.06 TOPSOIL <br />The topsoil removal, storage, and redistribution plan for the disturbed area associated with the Lower Wilson <br />and South Taylor mining areas will follow the procedures described in Section 4.06 in Volume land as <br />described in Section 2.05.3 (5) and 2.05.4 (2) (d) of this Volume (Volume 12).. <br />4.07 SEALING OF DRILLED HOLES AND UNDERGROUND OPENINGS <br />Drill holes and underground openings will be sealed in accordance with the procedures outlined in the Section <br />4.07 in Volume 1. <br />4.08 USE OF EXPLOSIVES <br />Explosives will be used for blasting in accordance with the procedures and specifications presented in <br />Volume 1, Section 4.08.. Map 26A presents distances to various structures of possible concern surrounding <br />the mining area. Only Section 4.08.2 has changed from Volume 1; see Sections 4.08.1 and 4.08.3 through <br />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 have been offered to owners of all structures within one- <br />half mile of the permit area. Pre -blast surveys were conducted on residential structures located at 6647 and <br />7072 Moffat County Road 51, various associated groundwater supply wells, and eleven power pole <br />foundations located along the ridge between Wilson and Taylor Creeks. Copies of the surveys are included in <br />Exhibit 14, Item 4. <br />4.09 DISPOSAL OF EXCESS SPOIL <br />Spoil removed from the South Taylor pit will be stockpiled in valley fill area as shown on Map 23A and Map <br />45. Colowyo expects a 20% swell of excavated materials; therefore, part of the material stockpiled in the East <br />and West Taylor Fills will remain at the conclusion of the project as shown on Post Mining Topography Map <br />19B. Placement will occur as described in previous sections of this volume and in Volume 1. <br />Design of the two (East Taylor and West Taylor) fills associated with the South Taylor Mine plan are <br />provided in Exhibit 23B. The East Taylor Fill will contain approximately 30.6 million yards of temporary <br />out -of -pit spoil and approximately 5.7 million yards of permanent out -of -pit spoil. The West Taylor Fill will <br />contain approximately 12.2 million yards of temporary out -of -pit spoil and approximately 22.1 million yards <br />of permanent out -of -pit spoil. Both fills will be regraded in accordance with the approved Post Mine <br />Topography shown on Map 19B. The final configuration of the fills is designed to minimize erosion. This <br />takes into account a number of the components of the other fill piles at the mine which have proven <br />successful. The final outslope will not exceed 3h: Iv. <br />Fill Name Temporary Volume Permanent Volume <br />East Taylor Fill 30,642,877 Cubic Yards 5,766,400 Cubic Yards <br />West Taylor Fill 12,263,314 Cubic Yards 22,051,300 Cubic Yards <br />South Taylor/Lower Wilson — Rule 4, Page 7 Revision Date: 4/2/18 <br />Revision No.: RN -07 <br />