2025-06-30_PERMIT FILE - C1981019 ‎(11)‎

• Permit No: C1981019
• IBM Index Class Name: Permit File
• Doc Date: 6/30/2025
• Doc Name: Performance Standards
• Section_Exhibit Name: Volume 15 Rule 4
• Media Type: D
• Archive: No

RULE 4 PERFORMANCE STANDARDS
Collom – Rule 4, Page 4 Revision Date: 6/20/22
Revision No.: MR-242
southern portion of Section 36 (T4N, R93W) and the northern portion of Section 1 (T3N, R94W) follows
the power line to where it intersects the eastern portion of the Collom Pit and the road will follow the
power line out into the future mining areas of the Collom Pit. Other sections of the light use raod will be
within the Collom Pit footprint adjacent to the power line itself. Once mining progess to this power line
location, the power line will be moved to the south, and the only portion of the light use road that will
reamin is in the southern portion of Section 36 and norther portion of Section 1.
Two light-use roads designated as JCR-1 and JCR-2, will be utilized to monitor and access small
sediment sumps along the Collom Haul Road. The location of these two light-use roads are shown on
Figure 4.03-1. For the most part, these light-use roads will utilize the footprints of pre-mining roads
within the permit boundary. Topsoil will be removed from a portion of the JCR-2 along the toe of the
Collom Haul Road until it intercipts a pre-mining road. No other topsoil removal will occur on JCR-1
and JCR-2 where the alignment falls within pre-mining roads that were disturbed prior to commencement
of mining the Collom Pit.
In accordance with Rule 4.03.3 (3), a field-design method will be utilized to construct the light-use road.
Topsoil will be removed and windrowed adjacent to the road. Sediment control for the portion of the
road that is outside of the Section 25 Pond watershed is described in Volume 18B, Exihibit 7-25D.
4.04 SUPPORT FACILITIES
The original support facilities used at the mining operation, including the office, shop and warehouse
complex, and the coal handling and loadout facilities may continue to serve as minor support facilities for
this expansion and are shown within the original Colowyo Permit Map 21 and Map 22, Volume 8. Many
of the support structures were constructed at the mine start-up in 1976-1977. The complete discussion on
all the original support facilities is found under Sections 2.05.3 and 4.04 in Volume 1.
The Collom area facilities will include an administration building, shop and warehouse facility, coal
crushing, explosives bunker, sedimentation ponds, utility lines, water lines, and haul roads that will be
constructed near the Collom Pit area. These facilities are detailed in the Structure and Facilities Map
22B.
4.05 HYDROLOGIC BALANCE
4.05.1 General Requirements
Please see Section 4.05.1 in Volume 1.
In addition to the mining, reclamation, and treatment methods referenced in this section, further
protection of the hydrologic balance will be established by an on-going plan for monitoring potential
changes in surface water quality and quantity and valley fill groundwater quality. This monitoring plan is
described under Section 4.05.13 and the monitoring locations are graphically shown on Map 10B.
4.05.2 Water Quality Standards and Effluent Limitations
Please see Section 4.05.2 in Volume 1.
4.05.3 Diversions and Conveyance of a Watershed Less than One Square Mile
The drainage and sediment control measures described under Section 2.05.6 and presented in the Erosion
and Sedimentation Control Plan will provide for clean water diversion of surface drainages within the