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-39- A 10.6 acre disturbance area at Pit 6 has been partially backfilled, and reclamation will be completed during the summer and fall of 1984. The only area which will be mined during this permit term is Pit 4. The application originally proposed additional strip pits (7 and 8) and a limited amount of auger mining. The application has subsequently been revised to exclude these activities. The mining plan for Pit 4 is similar to that employed at Pits 2 and 3, in that mining will progress updip with a sequence of boxcuts. The pit will advance toward the crest of a ridge to the east of Grassy Creek. Four coal seams will be extracted at Pit 4, to a maximum depth of 63 feet. Overburden will be excavated and transported with a combination of rubber tired scrapers and front-end loaders. Coal seams to be extracted include the Pinnacle #2, 3, 4 and 5 rider seams, which average 2 to 3 feet in thickness. The number 2 rider seam outcrops in the western portion of the Pit 4 area, and is not mined due to shallow overburden cover and resultant oxidized condition. The number 5 rider is not continuous throughout the Pit 4 area, but it is extracted when it occurs. Overburden and topsoil from initial boxcuts will be stored in temporary stockpiles in the southwestern portion of the Pit 4 disturbance area. After initial pit development; backfilling and grading, topsoiling, and revegetation will be achieved concurrently with pit advance. The final pit will be backfilled with the stockpiled spoils. Mining and reclamation is scheduled to be completed at Pit 4 during this permit term. The proposed operation is in compliance with the requirements of this section. XVI. Explosives - Rule 2.05.3(6) Information regarding blasting, including the blasting record form and a typical blasting configuration is provided in the application. There are no buildings or dwellings within a two mile radius of any proposed blasting area. The applicant has demonstrated compliance with the vibrational limitation equation of Rule 4.08.4(10). The proposed operation is in compliance with the requirements of this section. XVII. Backfilling and Grading - Rules 2.05.3(6), 2.05.3(a), 2.05.4(2)(a), 2.05.4 2 c 4.09, 4.13, and 4.14 Information on backfilling and grading is provided on pages IV-3 through IV-6 of the application. Based on previous experience at reclaimed Pits 2, 3, 5 and 6, the applicant has projected a 15% overburden swell for material at Pit 4.