2018-06-01_REVISION - C1980007 ‎(3)‎

• Permit No: C1980007
• IBM Index Class Name: Revision
• Doc Date: 6/1/2018
• Doc Name: Comment Forwarded To Applicant
• From: Shannon Hughes, Wild Earth Guardians
• To: DRMS
• Type & Sequence: PR15
• Email Name: LDS
• Media Type: D
• Archive: No

Table of Contents
ExecutiveSummary...................................................................................................................................1
Introduction and Previous Studies and Findings from Work Conducted at West Elk Mine .....................2
Introduction..........................................................................................................................................2
PriorEPA Work......................................................................................................................................2
Techno-Economic Study Commissioned by MCC.................................................................................2
MWCC Methane Emissions Data Reported under Subpart FF..............................................................3
Considerations for Capture and Use of CMM at the West Elk Mine........................................................9
CMMCapture......................................................................................................................................10
Abatement of drained CMM from GVBs.................................................................................................11
Economic Evaluation of CMM Abatement..............................................................................................12
Discounted Cash Flow Analysis...........................................................................................................12
Flaring as an methane abatement option at West Elk.......................................................................13
Results of CMM Destruction Economic Analysis................................................................................16
Summaryof Findings: ............................................................................................................................. 18
Recommendations for Improving Economic Performance of a Flaring Project.................................19
List of Tables
Table 1: Abutec Flare Process Data.............................................................................................................13
Table 2: Model inputs: Flaring Scenario......................................................................................................14
Table 3: Economic Indicators - 10 Year Flaring Project...............................................................................19
Table 4: Gas Gathering System Cost Comparison Table.............................................................................20
List of Figures
Figure 1: Graphic Representation of Publicly Available Methane Liberation Data for West Elk Mine ........4
Figure 2: Probability Distribution for Methane Concentration in ESM Shaft...............................................6
Figure 3: Probability Distribution of Total Ventilation Flow for ESM Shaft..................................................7
Figure 4: Probability Distribution of Number of GVBs Operating each Week..............................................8
Figure 5: Probability Distribution of Weekly Production for all Operating GVBs.........................................8
Figure 6: Probability Distribution of Methane Concentration in Gob Gas...................................................9