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Mountain Coal Company Internal Correspondence Data: September 23, 1995 Subject: iVlautz Cabin Inspection Sept. 1, 1995 A From/Location: R Parkins / Enginee ' G~Pi TolLocation: Kathy Welt /Environmental Eggineering On September 1st, Phil Schmidt and I visited the Mautz Cabin to observe damage reported to be the result of ground movement related to Longwall Subsidence in the azea. Surveys of the cabin indicate substantial movement has occurred since mining of longwall panel 5, and 6, but that the movement has stopped. The structure is a wood frame building constructed on a concrete slab foundation with a concrete slab floor. The foundation does not appear to extend below the frost line in the area, and is likely subject to movement do to natural freeze -thaw cycles in the.env'tronment. The foundation and the slab floor are separated by a cold joint with an expansion joint. We were met at the cabin by two employees from the Mautz ranch. They escorted us through and around the cabin so we could observe the "damage". Very Gttle if any cracking has occurred in the concrete slab floor, and the foundation, although the foundation has settled in the Northeast portion of the house in relation to the slab floor. It is diffictt to tell if this differentia! movement is caused by the ground subsidence, or just natural compaction of the soils underlying the foundation. There was a crack in the foundation slab in the Northeast comer of the cabin. In one area a toilet stool mounted in the slab floor and extending past the foundation floor interface was unstable, and needed support to properly function. We were shown several doors that were not hanging correctly, as evidence that subsidence had warped the home. While this is a good indication of subsidence damage, usually when subsidence is the root cause, windows also are damaged by the same movement. The windows, with the possible exception of the kitchen window were operating properly, although some stuck when we initially attempted to open them, as if they had been painted shut. It is difficult to reliably determine why the doors were in the condition they were in. Subsidence could have been the cause. However, poor installation methods allowing the doors to sag could also have been the root cause of this action. Cracks in the drywall of the house were also reported, and observed. The most noticeable was in the Northeast bedroom on the Southeast wall. The tape had moved and there was noticeable damage. I don't recall any other cracks of consequence, although a very small one could have been shown us in the main room of the cabin. I believe the damage in the Northeast bedroom was the result of a roof leak, not subsidence, but would be hard pressed to say subsidence did not contribute. Normally when there is subsidence damage, drywall will buckle and heave as the structure twists and settles differentially. No lazge cracks or buckling were observed. Also, they commonly radiate out from high stress areas such as the comers of windows and door sills. This was not noted as occurring either. Exterior to the home we were shown two other areas that were related as subsidence caused. The first was a concrete slab area on the East side of the house that had been poored as a walkway into the East door. This slab had pulled away from the structure a distance of about 1". Of all the problems at this building I would say that this was the most likely feature to have been caused by subsidence. With the position of the cabin over the top of a panel pillar line, it is in a 'r West Elk Mine, Somerset, Colorado