26
sand, and located at the tops of inner walls covering the entire ceiling area,
except that portion necessary for ventilation.
(ii) A fabricated metal roof constructed of
3
⁄
16
-inch plate steel lined with four
inches of hardwood. (For each additional
1
⁄
16
inch of plate steel, the
hardwood lining may be decreased one inch.)
(8)
Doors.
All doors are to be constructed of not less than
1
⁄
4
inch plate steel and
lined with at least two inches of hardwood. Hinges and hasps are to be attached to
the doors by welding, riveting or bolting (nuts on inside of door). They are to be
installed in such a manner that the hinges and hasps cannot be removed when the
doors are closed and locked.
(9)
Locks.
Each door is to be equipped with (i) two mortise locks; (ii) two padlocks
fastened in separate hasps and staples; (iii) a combination of a mortise lock and a
padlock; (iv) a mortise lock that requires two keys to open; or (v) a three-point lock.
Padlocks must have at least five tumblers and a casehardened shackle of at least
3
⁄
8
inch diameter. Padlocks must be protected with not less than
1
⁄
4
inch steel hoods
constructed so as to prevent sawing or lever action on the locks, hasps, and
staples. These requirements do not apply to magazine doors that are adequately
secured on the inside by means of a bolt, lock, or bar that cannot be actuated from
the outside.
(10)
Ventilation.
Ventilation is to be provided to prevent dampness and heating of
stored explosive materials. Ventilation openings must be screened to prevent the
entrance of sparks. Ventilation openings in side walls and foundations must be
offset or shielded for bullet-resistant purposes. Magazines having foundation and
roof ventilators with the air circulating between the side walls and the floors and
between the side walls and the ceiling must have a wooden lattice lining or
equivalent to prevent the packages of explosive materials from being stacked
against the side walls and blocking the air circulation.
(11)
Exposed metal.
No sparking material is to be exposed to contact with the
stored explosive materials. All ferrous metal nails in the floor and side walls, which
might be exposed to contact with explosive materials, must be blind nailed,
countersunk, or covered with a non-sparking lattice work or other non-sparking
material.
Fuel Supply Facility.
A fuel and lube station will be installed near the mine shops. It is
expected there will be two 40,000 gallon diesel fuel tanks and one 1,000 gallon gasoline tank
(see Section 5.8.3.2 for environmental protection measures).
4.7.1 Utilities
4.7.1.1 Power
Power Line.
Electric power to the Bull Hill Mine will be provided by the Powder River Energy
Corporation (PRECorp). An overhead distribution line extension will be constructed from
existing facilities to the Project Area and ultimately to the PUG Plant (see Maps 4.2-1 and 4.2-
2).
