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Page 12 Colorado Department of Public Health and Environment Construction Permit Air Pollution Control Division COLOWYO COAL COMPANY, L.P. Permit No. 95-MF-1040 - • Final Approval -Modification-4 ATTACHMENT C (These control measures are extracted from Permit No. C-81-019, November 5, 1992, issued by Colorado Division of Minerals and Geology, and amended on August 29, 1997) 2.05.6 Mitieation of Surface Minine Ooeration Impacts -Air Pollution Control Plan Colovryo maintains fugitive dust control measures as an integral part of a]] mining and reclamation activities. Presently, Colowyo operates under numerous Emission Permits issued from the Colorado Department of Health, Air Pollution Control Division, as more particularly described in Section 2.03.10. Copies ofall applicable emission permits issued by the Colorado Department of Health are contained in Exhibit 8, Au Quality Information. Colowyo conducts air quality monitoring a[ [he site in accordance with the requirements of dre emission perrrtits. The principal fugitive dust control practices employed by Colowyo are as follows: Roads Colowyo employs a dust suppression program for in pit roads and other unpaved roads which primarily involves periodic watering. Four mine water trucks run periodically as needed over the roads wetting down any dusty conditions. During the dryer months of the year, the water trucks will wet down the roads which are being utilized a minimum of two or three times per shift. If detemuned to be necessary as an addition to periodic watering, a chemical dust suppression agent may be used during the dry months on the primary in pit roads. To this date, however, chemical stabilization of the unpaved in pit roads has not been successful for more than a short period of time due to changing weather conditions and the use of heavy 170, 190, and 240 ton haulage tracks. Colowyo has surfaced "in-pit" roads with gravel or crushed rock; however, no roads in the pit area will be paved with asphalt. Asphalt could not sustain the enormous weights of the haulage equipment currently in used. Likewise, crawler equipment would rip the asphalt surface causing an extremely hazardous condition for all equipment and personnel. All roads in the minting operation will be constantly maintained by a motor grader, scraper, or robber tired dour to remove aoy coal, rock, or any other debris. Smooth and clean road surfaces are essential for not only minimizing dust, but also for allowing efficient and economic use of haulage equipment. The haul roads have been paved with asphalt to provide for emission control. The paved roads include approximately five miles of road from State Highway 13/789 to the main office building, the road from the main office building [o the Gossard coal loadout, and the road from the shop facility to the Gossard coal loadout. A strict speed control will be implemented for all roads to control dust. Speed limits have been set to 45 mph in the pit and 45 mph on the paved haul roads for all haulage equipment. Most haul road embanlmtent slopes and adjacent areas have been mechanically stabilized and seeded with a mixture shown in Table 7, Reclamation Seed Mixture. Mechanical stabilization has consisted of furrowing, chiseling, "cat tracking" and mulch, depending on accessibility to the slopes. No travel of unauthorized vehicles will be allowed on anything other than established roads. All overburden haulage equipment will be restricted only to appropriate roads. Colowyo does not plan to cover any of the haul tracks because the roundtrip between the coal crashing facility and the active mining area will be relatively short, and the loaded tracks will be moving slowly. Also, care will be taken by [he front-end • loader or shovel operators no[ to over{ ll any of the haul tracks so as to cause excessive fugitive dust. 081/0007/999