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. 2.05.6(6) <br />The Operator installed five subsidence monuments in the limited extraction <br />zone along Hubbard Creek (monuments 17-A through 17-E). These <br />monuments will be utilized to verify that subsidence does not occur along the <br />limited extraction zone. The monuments were installed during 2001 prior to <br />the November 2002 longwall start-up in panel D-7. The Operator has <br />installed seven subsidence monuments to to measure settlement over <br />superimposed multi-seam extraction as follows: <br />Panel B-3 B-4 B-7 B-9 B-10 <br />Monuments 11-A 6-A, 14-G 13-H, 1-A 31-A 2-C <br />The Operator will monitor the topographic surface, soil and vegetation <br />through interpretation of color areal photographs. The portion of the Iron <br />Point Lease managed by the Forest Service will be photographed during late <br />spring 2001. The area will then be photographed in five year intervals. A set <br />of the photographs will be supplied to the Forest Service and any changes <br />to the topographic surface, soil or vegetation will be noted. Field <br />investigation of changes may be required. Mitigation measures, if required, <br />will be developed jointly between the Operator and the Forest Service. The <br />Operator will cease monitoring the topographic surface, soil and vegetation <br />after the acquisition of a photographic record at least two years after the <br />completion of mining. <br />Immediately following retreat extraction in the immediate proximity of a <br />stream, spring or pond, the intensity of monitoring that feature will be <br />increased to once a month for six months. <br />The operator will visually inspect known historic and modern landslides within <br />the permit and adjacent area for stability in June and November of each <br />year. Additionally, known historic and modern landslides will be visually <br />inspected once a month for six months immediately following retreat <br />extraction in their immediate proximity. <br />TR-031 <br />2.os -112 - ovoa <br />/1 PPRovsp <br />s~ii/o y <br />