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RULE 4 PERFORMANCE STANDARDS <br /> <br />South Taylor – Rule 4, Page 6 Revision Date: 7/21/25 <br /> Revision No.: MR-267 <br /> <br /> <br />the pit, indicating that there is 50 to 90 times more acid-neutralizing potential than there is acid-generating <br />potential in the interburden (Exhibit 6, Item 6). <br /> <br />4.05.9 Post-Mining Impoundments <br /> <br />Please see Section 4.05.9 in Volume 1. <br /> <br />4.05.10 Underground Mine Entry and Access Discharges <br /> <br />Colowyo currently conducts surface coal mining exclusively. <br /> <br />4.05.11 Groundwater Protection <br /> <br />Please see Section 4.05.11 in Volume 1. <br /> <br />4.05.12 Protection of Groundwater Recharge Capacity <br /> <br />Please see Section 4.05.11 in Volume 1.. <br /> <br />4.05.13 Surface and Groundwater Monitoring <br /> <br />The current surface and groundwater monitoring program can be found in Section 4.05.13 in Volume 15. <br /> <br /> <br />4.05.14 – 4.05.18 Various Topics <br /> <br />These sections are addressed in the Volume 1. <br /> <br />4.06 TOPSOIL <br /> <br />The topsoil removal, storage, and redistribution plan for the disturbed area associated with the South Taylor <br />mining areas will follow the procedures described in Section 4.06 in Volume 1and as described in Section <br />2.05.3 (5) and 2.05.4 (2) (d) of this Volume (Volume 12).. <br /> <br />4.07 SEALING OF DRILLED HOLES AND UNDERGROUND OPENINGS <br /> <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 /> <br />4.08 USE OF EXPLOSIVES <br /> <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 /> <br />4.08.2 Pre-Blast Survey <br /> <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