2018-01-05_REVISION - C1982056

• Permit No: C1982056
• IBM Index Class Name: Revision
• Doc Date: 1/5/2018
• Doc Name: Adequacy Review
• From: DRMS
• To: Twentymile Coal Company
• Type & Sequence: RN7
• Email Name: TNL
• Email Name: DIH
• Media Type: D
• Archive: No

Name of Addressee
Page 4
Date
5RT 1648
Exhibit 06P
Needs Data
Yes - Avoid
No vehicle traffic and ground
disturbance activities. Drive around
current graded road to the south.
Avoided by additional activities that
Yes - Avoid
impact undisturbed areas. Existing
additional surface
maintenance can continue without
5RT993
Exhibit 06P
Needs Data
impact
impacting site.
This site was re-evaluated. A portion of
the site which could have research
potential should not be impacted by
5RT487
I Exhibit 6T
Needs Data
Yes - Avoid
conveyor construction.
2.04.7 Baseline Hydrolojeic Conditions
A review of surface water related sections of Rule 2.04.7 was conducted. The following questions pertain
to Exhibit 32:
15. Describe to what extent Foidel Creek Mine has been able to improve winter water quality and
quantity data collection in affected reaches of the Yampa as related to conclusions 1 a, b, and c
drawn in Exhibit 32.
16. Describe to what extent a review and update of site-specific regression functions as per
conclusion 2 has been undertaken.
17. Please state if additional nodes in the streamflow system have been added or modified. If
additions or modifications occurred, please state through what permitting action changes were
made. (Conclusion 3).
18. Please state if a critical review of stream standards, as per conclusion 4 has taken place.
19. If a review of stream standards occurred please describe the results of this review and cite, or
submit to DRMS, the pertinent document.
20. Baseline characterizations of the Wadge Coal Wolf Creek Coal Interburden and the Wolf Creek
Coal Seam were established with the approval of TR -83 as well as the Wolf Creek Reserve
monitoring plan in Exhbit 14A. The development of the Wolf Creek Reserve has lowered the
poteniometric surface elevation in the Wadge overburden. Figure 06s Potentiometric Surface
Wadge Coal Overburden and Figure l I Wadge Overburden Potentiometric Surface and TDS
Concentrations are no longer representative of the current mine plan and should be updated.
(Rule 2.04.7(1) (a)(i), requiring the applicant to provide the depth below the surface and the
horizontal extent of the potentiometric surface of each aquifer above, within and, if potentially
impacted, below the lowest coal seam to be mined)
21. In accordance with Rule 2.04.7(1)(a)(iv), ownership, uses and location information for all
existing wells, springs and other developed ground water resources must be included in the
permit application package. Please address the following issues:
a. Wells within the permit boundary are referenced to be listed in revised Table 9
for groundwater. Page 2.04-39 references an updated Table 9 from TR13-83 in