2011-05-18_PERMIT FILE - C1981012A (2)

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May 11, 2011 Page 15 Annual surveys should be conducted for the service life of the highway. Visual monitoring should be performed on the roads. Any appearance of cracks, heave, slumps or steep gradients in the roads should be noted. • Structural anomalies reported by the surface owner(s) will be investigated. 4.11.7 Consequences of Damage to Paved Roads Horizontal strains in excess of the allowable strain levels could create cracks, heave, slumps, significant changes in gradient, etc. All of these factors could deteriorate the road surface, possibly adversely affecting driving conditions or road utility. 4.11.8 Paved Road Damage Mitigation Plan In case monitoring indicates onset of damage or potential for damage to paved roads, the following mitigation plan should be adopted. • Appropriate personnel at mine and regulatory authorities, as well as the owners of the road, should be informed in case anomalies are observed that may indicate an affected road segment. • Regrading and resurfacing should be applied to affected road segments. • The mining plan should be re- evaluated to ensure that operations will not further damage the road segment in question, or an agreement should be reached with the road owner that such damage is acceptable as long as it is repaired. 4.12 Brick/Masonry Low Rise Structures 4.12.1 Brick /Masonry Low Rise Structure Subsidence Control Plan Several buildings on either side of SH 12 (a church, a school, and several houses) were classified as brick/masonry low rise structures. According to the guidelines outlined in the Pennsylvania Bituminous Mine Subsidence and Land Conservation Act of 1966, the safe lateral buffer zone around churches and schools is obtained by multiplying the mining depth of cover by the tangent of 15° and adding 30 ft. No development mining is to be performed within this buffer zone. Both the church and the school are horizontally more than 300 ft away from any mine workings. Room - and - pillar workings may be developed beneath other brick/masonry structures as long as stable pillars are left within a buffer zone calculated as above. The pillar sizes for development mining within the buffer zone are to be determined using appropriate methods such as ARMPS (Analysis of Retreat Mining Pillar Stability) so that they have stability factors of at least 1.5. In case the workings directly beneath the brick/masonry buildings are to be utilized for water storage, the stability of the developed pillars is to be evaluated on a site specific basis. Agapito Associates, Inc.