2021-07-21_PERMIT FILE - C1981019A ‎(2)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 7/21/2021
• Doc Name: Volume 1 Rule 4
• Section_Exhibit Name: 4.01 Through 4.30
• Media Type: D
• Archive: Yes

RULE 4 PERFORMANCE STANDARDS

Rule 4 Performance Standards 4-18 Revision Date: 12/21/20
Revision No.: TR-143
from an underground or surface source where the water supply has been affected by the mining
operation.

Colowyo does not anticipate that any water supply or water right of any owner of interest will be
affected by the mining operation.

4.05.16 Discharge of Water into an Underground Mine

No surface water will be diverted into any underground mine workings.

4.05.17 Post-mining and Rehabilitation of Sedimentation Ponds, Diversions,
Impoundments, and Treatment Facilities

No treatment facilities are planned. Approved permanent sedimentation ponds, stock ponds, and
permanent diversions will be left in place. These structures will be maintained in an appropriate
condition before the Permit area is abandoned by repairing any necessary portions, cleaning
sediment and debris out, establishing appropriate vegetation and providing soil stabilization.

4.05.18 Stream Buffer Zones

In accordance with Rule 4.05.18, no land within 100 feet, or greater if required by the Division, of
a perennial stream, an intermittent stream, or an ephemeral stream with a drainage area greater
than one square mile, shall be disturbed by surface and underground coal mining operations unless
the Division specifically authorizes surface or underground mining operations closer to, or through
such a stream. Additionally, the area not to be disturbed shall be designated a stream buffer zone
and marked as specified in Section 4.02.5.

The locations of the disturbances that have occurred within 100’ of a stream buffer zone are
described below and are depicted on Map 10C.

Good Springs Creek
Streeter Pond was constructed within 100 feet of Good Springs Creek. During construction
(sometime during the late 1970’s) and to date this pond has not created any adverse impacts to
Good Springs Creek. This structure is not anticipated to have any long-term impacts to Good
Springs Creek.

Other structures have been constructed or previously existed within 100 feet of Goodsprings
Creek and they include Colowyo’s access road off of Highway 13 where it crossing Goodsprings
Creek and Colowyo’s guard shack. Colowyo constructed the access road to the mine and the
guard shack at the beginning of the Colowyo Mine. To date the access road and guard shack
have not created any adverse impacts to Good Springs Creek, and these long term structures are
not anticipated to have any long term impacts to Good Springs Creek.

West Fork of Good Springs Creek
The access road to Section 28 Pond off of Highway 13 was not a new disturbance when
Colowyo began using it to construct and access the Section 28 Pond. Rather it was premining,