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2021-08-09_PERMIT FILE - C1981019A (5)
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2021-08-09_PERMIT FILE - C1981019A (5)
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Last modified
8/25/2023 7:19:26 PM
Creation date
4/26/2022 2:58:21 PM
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Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
8/9/2021
Doc Name
Volume 1 Rule 4
Section_Exhibit Name
4.01 Through 4.30
Media Type
D
Archive
Yes
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RULE 4 PERFORMANCE STANDARDS <br /> <br />Rule 4 Performance Standards 4-15 Revision Date: 12/21/20 <br /> Revision No.: TR-143 <br />under the sandstones. No toxic concentrations of acid forming materials have been found in the <br />overburden, reclaimed slopes or surface and ground water system associated with the Colowyo <br />Mine. No adverse effects on groundwater quality are expected to occur due to mine excavations <br />or backfilling. <br /> <br />4.05.12 Protection of Groundwater Recharge Capacity <br /> <br />The reclamation plan as described in 2.05.4 will return the disturbed lands to approximately the <br />pre-mining condition; therefore, ground water recharge capacity is expected to approximate the <br />premining condition. Also, because of the minimal existence of ground water in the mining area, <br />the mining operation and subsequent reclamation should have no adverse effect on the existing <br />ground water recharge capacities. <br /> <br />The ground water monitoring plan is further documented in 4.05.13. The mine has established <br />Point of Compliance locations for alluvial and valley fill aquifers. Please refer to Volume 2C, <br />Exhibit 7, Item 19 for a description of the alluvial aquifer investigation report and the points of <br />compliance wells for Goodspring, Taylor, and Wilson Creeks. There are not established points of <br />compliance for any regional aquifers because of a lack of ground water. The following is provided <br />to document this: <br /> <br />The aspect of monitoring ground water is dependent on whether or not there is a <br />continuous, non-perched ground water layer/zone to monitor. Since active mining at <br />Colowyo Mine began 30 years ago, the mining zone in both the East and West Pits have <br />not encountered any significant ground water, except for perched ground water. Therefore, <br />the following is presented to clarify the ground water conditions at the Colowyo Mine. <br /> <br />Geology/Topography <br /> <br />The Colowyo Mine is located in the Williams Fork Formation of the Cretaceous Mesaverde <br />Group. The Williams Fork Formation is comprised of discordant beds/units of sandstone, <br />siltstone and mudstone and coal seams, with an approximate thickness of 1,200 to 1,300 <br />feet in the mine area. Deposited in a deltaic environment, the beds vary in thickness and <br />lateral extent throughout the Colowyo Mine. The numerous coal seams also vary in <br />thickness and lateral extent. The sandstones tend to be very fine grained to fine grained <br />and poorly sorted, with various amounts of silt and clay. For the siltstones and mudstones, <br />theses units contain various amounts of finer and coarser materials. The total mined <br />sequence in both pits is up to 450 feet thick and is comprised principally of mudstones, <br />siltstones and coals, with sandstone layers being least prevalent. <br /> <br />The Williams Fork Formation conformably overlies the Iles Formation. At the top of the <br />Iles Formation is the Trout Creek Sandstone (TCSS). The TCSS is a massive, white to <br />light gray, very fine to fine grained, moderately well sorted sandstone with a thickness of <br />between 50 and 70 feet and is approximately 1,200 to 1,300 feet below the Colowyo Mine. <br />This is the only mapped continuous unit in the area of the Colowyo Mine and has been <br />noted as being an excellent marker bed for correlation work of the coal seams. Beneath <br />the TCSS, the Iles Formation is comprised of sandstones, siltstones and marine shales.
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