20210903PAC to PIIC Attach 77-3 Addendum1.pdf

PACIFICORP
ENERGY WEST MINING COMPANY
DEER CREEK MINE MSHA ID NO. 42-00121

Mill Fork Access #2 Mains
Rilda Canyon Portals 1st Right Submains
Proposed Bulkheads – Installation and Monitoring Plan

Addendum #1

Technical Assistance Request for Review of Submittal for Mill Fork Access#2 Mains and Rilda
Canyon Portals 1st Right Submains Proposed Bulkhead Plan, Energy West Mining Company,
Deer Creek, MSHA I.D. No. 42-00121, Huntington, Emery County, Utah

Mine Emergency Operations Review
February 23, 2015
Christopher R. Snyder

March 3, 2015

At the District’s request for technical support concerning proposed water retention bulkheads at
Energy West’s Deer Creek Mine, MSHA Mine Emergency Operations reviewed the bulkhead
plan for compliance with the Code of Federal Regulations. Energy West’s submittal proposed
the use of boreholes located just inby the proposed bulkhead locations to serve as gas sampling
points. As stated in the letter from Mine Emergency Operations, Christopher R. Snyder, dated
February 23, 2015, “…this proposed practice does not meet the requirements of the Code of
Federal Regulations. Therefore, per the approved seal plan, an atmospheric gas sampling pipe
must be installed throughout each bulkhead. Sampling will be required until the design strength
of each seal has been reached and it has been approved to serve as a bulkhead.”
To comply with this requirement, Energy West will install one atmospheric sampling pipe in
each seal as specified in Figure 11 – Atmospheric Gas Sampling Tube.