2009-10-30_PERMIT FILE - C1982056A ‎(5)‎

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 10/30/2009
• Doc Name: Pages 2.05-123 to 2.05-197.3
• Section_Exhibit Name: 2.05.5 Postmining Land Uses
• Media Type: D
• Archive: Yes

be visually inspected by the utilities prior to undermining, to identify structural defects, missing or damaged
components, loose bolts, and anything else that may affect the integrity of the structures during subsidence.
• These powerlines run the entire length of the panel, so the plan reflects the flexibility needed to monitor the lines
and obtain useful information.
The distance between each of the wooden structures for the WAPA powerline is approximately 1,100 to 1,200
feet. The distance between each of the steel lattice structures for the WAPA/PSC /Tri State powerline is also
approximately 1,100 to 1,200 feet. As noted in SubTerra's 19 -Right Powerline Study Report, the subsidence
profile for each of the powerline structures will take from 20 to 25 -days to fully develop, depending on the rate
of longwall face retreat. Each structure will start to subside when the longwall face is approximately 400 -feet
from the structure. Subsidence at each structure will be, for the most part, complete once the longwall face has
passed 600 feet beyond the structure. The powerline structures will, therefore, react to the subsidence wave
independently; as subsidence at one structure ends, subsidence at the next structure begins. This distance factor
should, therefore, eliminate the potential for complex interactions, allowing the response of each structure to be
independently monitored.
The monitoring plan will be performed by TCC and utility company personnel and will incorporate both visual
inspections of the line and use of surveying equipment to detect any movement of the structures. A baseline
survey of each powerline will be completed by TCC at least one month prior to the start of undermining the
powerlines. The actual powerline monitoring will be triggered by the distance of the active longwall face from
the first and each subsequent powerline structure. Monitoring, as described below, will begin when the active
face is within approximately 400 feet of the closest powerline structure and will continue until the active
longwall face is approximately 1,000 feet past the last powerline structure. Independent monitoring within the
active subsidence wave of each successive powerline structure will be performed as follows:
1. A TCC employee, representative, or a utility company representative will visually inspect the structures
• within the active subsidence wave daily. The visual inspection will provide a daily log of the stability
of powerlines and support structures. During the inspections, the condition of the structure(s) will be
observed and changes to the structures will be noted. The log will include notes on the visual integrity
of bolts, support structures, insulators, foundation/soil contact areas, etc. The record will be maintained
at TCC's office.
2. The survey for the first two structures on each powerline will begin when the longwall face is 400 feet
from each of the structures.
3. A survey of the first two structures of each powerline will then be perforn led every two days until the
longwall face is under these structures.
4. The first two structures of each powerline will then be surveyed daily until the subsidence rate decreases
to one inch per day.
5. The first two structures of each powerline will then be surveyed once per week until the longwall face is
1,400 feet past the structure.
6. After the longwall face is past the 1,400 foot distance, and subsidence has decreased to one inch or less
since the last survey, the surveying of an individual powerline structure will cease.
7. Should the actual survey data agree with the subsidence prediction for the first two structures of each
powerline, the remaining structures for each powerline will be surveyed once per week during the time
they are within the active subsidence wave.
8. Should the actual survey data vary from the subsidence model for the first two structures of each
powerline, the subsidence model will be updated with revised projections for the remaining structures.
Monitoring, as detailed in Steps 2 through 6, will continue for the next pair of structures for each
powerline. This process will be repeated as long as meaningful discrepancies exist between predicted
and actual movements.
9. A TCC employee, representative, or a utility company representative will continue to visually inspect
• the remaining structures on each of the powerlines within the active subsidence wave daily.
10. Powerline structures already undermined, but outside of the active subsidence wave, will be subject to
visual observations and postmining instrument surveys on a once - monthly basis during the life of the
19 -Right Longwall Panel.
PRO9 -08 2.05 -191.6 04/29/09