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Permit Number CO-0068, ( ) Page 6 of 7 ~ 7. The Regulatory Authority directs Bear Coal Company to submit, for revie~d `- and approval by the Regulatory Authority, proposed loco*_iors and construction specifications for the three monitoring stations to be installed upon the backfilled material at the Bear No. 2 port al 'area. Immediately following the completion of backfilling and grading of the Bear "Jo. 2 portal area, these three monitoring stations shall be installed as specified and surveyed. Sur- veying of these stations shall be repeated on a semi-annual basis far a period of two years. Results of the surveying of these stations shall be submitted to the Regulatory Authority within 30 days following completion of the semi- annual survey. If monitoring of the backfilled area detects movement, which the Regulatory Authority determines to represent an indication of imminent hazard, the Bear Coal Company 'shall expeditiously develop and implement, fol- lowing the Regulatory Authority's approval, a plan to mitigate that hazard and to stablize the backfilled areas. 8. The Regulatory Authority directs Bear Coal Company to perform Proctor testing to determine the moisture-density relations of the materials to be utilized in backfilling the Bear No. 1 and No. 2 mine portal areas and submit the result to the Regulatory Authority. In conformance with the recommenda- tions of Rocky Mountain Geotechnical, Inc., the materials shall be placed and compacted to achieve 95% of the maximum proctor density, as determined in accordance with ASTM standard TEST D-698. Further, Bear Coal Company shall submit a certified inspection report to verify completion of backfilling and grading of the Bear No. 1 and No. 2 mine portal areas in conformance with the approved plan. This certified report shall be prepared .by a qualified regis- tered professional engineer or professional geologist. The report shall be (~ submitted to the Regulatory Authority within 60 days of the completion of backfilling and grading. 9. The Regulatory Authority directs Bear Coal Company to submit a detailed engineering plan for the pot±al access road and portal facilities at the Bear No. 3 Mine, for review and approval by the Regulatory Authority, no later than 30 days following approval of the permanent program permit. This detailed engineering plan shall include road and portal crass-sections, road and portal plan and grade design drawings, and detailed engineering design drawings for all retaining structures and drainage facilities. No additional disturbance shall occur in the area of the portal access road or portal facilities until these detailed engineering plans have been reviewed and approved by the Regu- latory Authority. 10. The Regulatory Authority directs Bear Coal Company to submit the locations and construction specifications for monitoring facilities designed to monitor the stability of the portal access road and portal facilities at the Bear No. 3 Mine. These monitoring facilities shall consist of appropriately located tilt metering and location monitoring facilities. These facilities shall be designed to monitor both the operational and reclaimed configurations of the portal access road and portal facilities. Installation of these monitoring facilities shall occur as immediately following constuction in the portal access road and portal facility areas as is feasible. 1•fonitoring shall com- mence immediately following installation and continue on a semi-annual basis until two years following completion of the reclamation of the portal access road and portal facility area. Results of the semi-annual monitoring shall be /"'~ submitted to the Regulatory Authority within 30 days following completion of that semi-annual monitoring. If the monitoring of these facilities detects any imminent hazard, in the opinion of the Regulatory Authority, Bear Coal Company shall expeditiously develop and implement, following Regulatory Authority approval, a plan to mitigate That hazard and to stablize the affect- ed ;lone. ., ~ ~~ iil if 1 , tl, 3