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has committed to replacement of varying topsoil thicknesses (ranging from 1 foot to 4 feet) within designated zones on the regraded area. The proposed operation is in compliance with the requirements of this section. V. Sealing of Drilled Holes and Underground Openings All exploration, drill or boreholes, wells, or other underground openings except those used solely for surface blasting will be plugged or sealed to prevent acid or toxic drainage form entering the groundwater, minimize disturbance to the prevailing hydrologic balance, and ensure safety. Details of the sealing plan are located in Tab 18, Volume 12 of the permit application package. No variance from regulatory requirements regarding sealing has been requested or proposed for approval, and no such specific findings apply. The Division requires that each hole, well or underground opening be capped, sealed, backfilled or otherwise properly managed (4.07.3). VI. Use of Explosives Explosives will be used to fragment overburden and exposed coal at the Seneca II-W Mine. Seneca Coal Company typically will use ammonium nitrate and fuel oil (ANFO) for this purpose, primed with cast primers and detonated with detonating cord. A certified blaster will be in charge of all blasting operations to ensure compliance with State and Federal laws. Additional information regarding planned blasting operation is located in Volume 11, Tab 14 of the permit application package. Seneca submitted a revision to the permit application to establish maximum allowable ground vibrations from blasting, as a result of damage to private property, including oil tanks and an oil well. Seneca will maintain peak particle velocities at the oil well site of five inches per second (ips) or less, and will utilize a seismic monitor at the well site to verify maximum peak particle velocities. Seneca also increased the bore hole column stem in areas where mud seams are encountered in the upper strata. These plans are implemented within 1,000 feet of the Meridian Oil Well. VII. Backfilling and Grading The application states that the mining plan for the Seneca II-W Mine was developed in conjunction with the Seneca II Mining Plan. The pit progression design was based on standard mining practices, tried and proven at the analogous Seneca II Mine. The backfilling and grading plan is found within Volume 13, Tab 20. The reclamation schedule, including a request for a variance from the contemporaneous reclamation requirements of Rule 4.14 is contained within Volume 12, Tab 19. Seneca R-W Findings Document 48 November 17, 2004 Permit Revision No. 4