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• 2.05.6(6) <br />(f)(v)(B) Monitoring <br />The hydrologic monitoring program will continue. At least quarterly <br />monitoring will be performed. Surface streams, ponds, springs and <br />groundwater will continue to be monitored. The results of the monitoring will <br />be observed for abrupt changes in water levels, flows or quality which might <br />indicate mining impact. <br />The Operator has set up a subsidence network over the first five longwall <br />panels to gain as much information as possible to compare actual data with <br />the subsidence predictions presented in Volume III, Exhibit 15. Additionally, <br />the actual subsidence data will be utilized to check the design and <br />effectiveness of limited extraction zones. <br />The Operator has proposed the installation of ten subsidence monuments <br />in the limited extraction zone along Hubbard Creek. These monuments will <br />• be utilized to verify that subsidence does not occur along the limited <br />extraction zone. Monuments will be installed at least 60 days prior to the <br />development of the bleeder entries in longwall panel D-7. Based on the mine <br />plan, the monuments should be installed during the first quarter 2002. <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 />PR-04 2.05 - 112 - 02/22/01 <br />