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October 11, 2011 Page 27 <br />4.12.3 Worst Possible Consequences of Damage to Brick/Masonry Low -Rise Structures <br />Subsidence - induced damages to brick/masonry walled low -rise structures may be <br />classified into three categories architectural, functional, and structural —depending on the <br />levels of ground disturbance. Architectural damage may mean small cracks in the plaster and <br />sticking of doors and windows. Functional damage could bring about instability of some <br />structural elements, e.g., jammed doors and/or windows, broken window panes, and restricted <br />building services. Structural damage may render the structure unsafe for habitation, and possibly <br />lead to collapse, requiring complete rebuilding or restoration. <br />4.12.4 Brick/Masonry Low -Rise Structure Damage Mitigation Plan <br />In case monitoring indicates the onset of damage or potential for damage to <br />brick/masonry low -rise structures, the following mitigation plan should be adopted: <br />Appropriate personnel at mine and regulatory authorities, as well as the owners of the <br />building, should be informed in case anomalies are observed that may indicate an <br />affected building. <br />Remedial techniques such as trenching, shoring, and structural reinforcement should be <br />applied to restrict further damage to the structures. <br />• The room - and - pillar development plan should be re- evaluated to ensure that operations <br />will not further damage the structure in question. <br />4.13 Timber Frame Buildings <br />4.13.1 Timber Frame Building Subsidence Control Plan <br />Several structures on either side of SH 12 such as frame houses, sheds and/or pens, <br />greenhouses, garages, barns and log frame cabins were classified as timber frame buildings. <br />Room - and - pillar entries and panels may be developed underneath timber frame structures with <br />no pillar extraction within the buffer zone estimated using the Pennsylvania Subsidence Act <br />guideline. <br />The pillar sizes for development mining within the buffer zone are to be determined using <br />appropriate methods such as ARMPS so that they have SFs of at least 1.5. In case the workings <br />directly beneath the timber frame buildings are to be utilized for water storage, the stability of <br />the developed pillars is to be evaluated on a site - specific basis. <br />4.13.2 Timber Frame Building Monitoring Plan <br />plan: <br />To ensure that the control plan is effective, AAI recommends the following monitoring <br />Accurate location and elevation information for the buildings must be collected prior to <br />mining. <br />Agapito Associates, Inc. <br />