2011-05-18_PERMIT FILE - C1981012A (12)

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��lM 1 i Id � -11 II III I 11111 . :111 L � 1 III- �IIIIII IIII Me I III 4. a _ _ _ _ -1 Ijtj 1 —I � 1-111 -1 I I —I I I — I I —I 11- YY S�EQ CMLLMMS; _I I E.I I I- III - III -III III -1 TYPICAL CONCRETE ENCASED DUCT3ANK (SCH. 40 PVCI �• a� �o�aaR a a m , s�v nm - x �n f+ avesl n a � :nmac +ae+ ui tuac uc uw TYPICAL CONCRETE ENCASED DUCTPA.N4 r� (SCH. 40 PVC SECTION 3 -3 Cj SERE qS Figure 2b. Typical concrete encased electrical duct bank construction. An emergency escape hoist will be added to the east portal exhaust shaft. The hoist consists of a shuttle cage with hoist and controls. The hoists have independent power sources for emergency operation. It may be necessary to replace the vane axial fan at the West Portal with a centrifugal fan capable of operating at higher pressures. The 600 hp fan requires an enlarged foundation and electric power. The overhead power line will be extended from the East portal substation to the West portal. Winter temperatures are such that the fresh air intake requires heating at the East portal. Two 1 MM Btu propane powered heaters will be installed on top of the East portal rope slope canopy. An 18,000 gallon propane tank will be located on concrete pylons down wind and to the east. It is necessary to install the tank in an area such, that if a leak were to occur it would not migrate into the underground mine. As the mine works advance dewatering of the old Allen works is necessary for the protection of the workers. Due to the geometry and the structure of the old works, two additional mine dewatering holes will be needed. Each borehole will be constructed and permitted through the Colorado Division of Water Resources. Each hole requires the installation of a pump. The pumps require electric distribution to the location. The Bates Portal will be located southeast of the silos. The portal face up requires about a 45 foot high cut. Cut slopes in common material are excavated 1.5H:1 V. Cut TR -55 Page 2.05 -5d 04/8/11 =men = ®O ©0, ==[ =M �1 ©m® � -11 II III I 11111 . :111 L � 1 III- �IIIIII IIII Me I III 4. a _ _ _ _ -1 Ijtj 1 —I � 1-111 -1 I I —I I I — I I —I 11- YY S�EQ CMLLMMS; _I I E.I I I- III - III -III III -1 TYPICAL CONCRETE ENCASED DUCT3ANK (SCH. 40 PVCI �• a� �o�aaR a a m , s�v nm - x �n f+ avesl n a � :nmac +ae+ ui tuac uc uw TYPICAL CONCRETE ENCASED DUCTPA.N4 r� (SCH. 40 PVC SECTION 3 -3 Cj SERE qS Figure 2b. Typical concrete encased electrical duct bank construction. An emergency escape hoist will be added to the east portal exhaust shaft. The hoist consists of a shuttle cage with hoist and controls. The hoists have independent power sources for emergency operation. It may be necessary to replace the vane axial fan at the West Portal with a centrifugal fan capable of operating at higher pressures. The 600 hp fan requires an enlarged foundation and electric power. The overhead power line will be extended from the East portal substation to the West portal. Winter temperatures are such that the fresh air intake requires heating at the East portal. Two 1 MM Btu propane powered heaters will be installed on top of the East portal rope slope canopy. An 18,000 gallon propane tank will be located on concrete pylons down wind and to the east. It is necessary to install the tank in an area such, that if a leak were to occur it would not migrate into the underground mine. As the mine works advance dewatering of the old Allen works is necessary for the protection of the workers. Due to the geometry and the structure of the old works, two additional mine dewatering holes will be needed. Each borehole will be constructed and permitted through the Colorado Division of Water Resources. Each hole requires the installation of a pump. The pumps require electric distribution to the location. The Bates Portal will be located southeast of the silos. The portal face up requires about a 45 foot high cut. Cut slopes in common material are excavated 1.5H:1 V. Cut TR -55 Page 2.05 -5d 04/8/11