2011-12-06_REVISION - C1980001 ‎(3)‎

• Permit No: C1980001
• IBM Index Class Name: REVISION
• Doc Date: 12/6/2011
• Doc Name: Proposed Deciision and Findings of Compliance
• From: DRMS
• To: Chevron Mining, Inc
• Type & Sequence: RN6
• Email Name: JHB
• Media Type: D
• Archive: No

1. The activities proposed by the applicant will not interrupt, discontinue, or
preclude farming on the alluvial valley floors that are irrigated or naturally
subirrigated [Rule 4.24.3(1)].
2. The proposed activities will not materially damage the quantity or quality of
water in the surface or ground water system described above [Rules 4.24.3(3)
and 2.06.8(5)(a)(ii)].
3. The proposed activities will comply with the requirements of the Act and the
Regulations with respect to alluvial valley floors [Rule 2.06.8(5)(a)(iii)].
4. Surface coal mining and reclamation operations will be conducted to preserve
the essential hydrologic functions of alluvial valley floors outside the permit
area and to reestablish the essential hydrologic functions of alluvial valley
floors within the affected area throughout the mining and reclamation process
([Rule 4.24.2).
5. An environmental monitoring system has been installed, and shall be
maintained and operated by the permittee on all alluvial valley floors during
surface coal mining and reclamation operations and continued until all bonds
are released in accordance with Rule 3 (Rule 4.24.4). TR48 approved
discontinuation of monitoring of the alluvial wells. Chevron Mining Inc. sealed
the monitoring wells in September 2009.
Oak Creek AVF
During the review of the original application for the Edna Mine permit, the Division
determined that Oak Creek was an AVF. Chevron applied for, and the Division approved
Permit Revision No. 3 to declassify Oak Creek, where it is immediately adjacent to the
eastern permit boundary, as an alluvial valley floor as defined in Rule 1.04(10). The area
that is no longer classified as an AVF extends from the southeastern permit boundary
north to and including the Routt County Road 179 crossing over Oak Creek. This area
includes the NE'/ Section 19; NW'/ Section 20; W %2SW % and W %2SW' /NW'/ Section
17, Township 4 North, Range 85 West of the 6th Principal Meridian. The limits of
declassification are defined on Exhibits 4.6 -10 and 4.6 -11 in the Edna Mine PAP.
Portions of Oak Creek upstream and downstream of this area remain a designated AVF.
The Edna Mine would have little or no impacts on the Oak Creek AVF because the AVF
is upgradient from Edna's ground water flows and would receive only occasional,
neglible surface water runoff from the mine.
C1980 -001 Edna Mine Permit Renewal No. 6 31