CHAPTERII, SECTION 3
withstand expected overpressures. The buttress
was formed of six concrete thrust blocks from
which six 14-inch 142 #WF beams extended
upward to the top of the wall. An equipment
room of reinforced concrete 19’ x 32’ x12’ high
with 1’-6” walls was added to each station. In
this room was placed dehumidifying equipment,
two generators, and a helium gas system using
six User-supplied manifolds. The piping from
helium bottles to manifolds was required to be
approximately the same lengths, and criteria
required that the leakage of helium not exceed
1 CFH of gas at standard pressures and temperatures during a 24-hour period.
It was necessary to remove the old wiring
and pull new wires. Holes were drilled through
the heavy existing east wall for running hydraulic and electrical connections between existing structure and the new equipment room. A
plywood dust cover was fitted in the chimney
of the existing structure with removable plywood covers at one end of the dust cover to
provide access. Two 14-ton electric hoists were
mounted: one on the boom above the entrance
to the station, the other above the hatch between Rooms 1 and 2. New doorlatch assemblies
Figure 2-109.
Page 2-116
were designed, fabricated, and installed for the
blast doors of the 24” wide camera port. New
type latches were required so that the blast
doors would be gas-tight when closed. Work
benches, access ladders and stairways, storage
shelves, fuel tanks, compressed air systems for
blast door operation, and salt water pumps
were also required.
Power for Station 2300 was furnished by
two - 35 KW generators installed in the equipment room. Power for Station 2301 was furnished from the island distribution system
through a 35 KVA transformer installed in the
equipment room.
Sixteen-pair timing signals
were terminated in Station 2300 and six pair
terminated in 2301. A telephone with an extension to a trailer was provided at each station.
In Station 2301 there was a noticeable
amount of spalling of the existing limonite
caused by oxidation of the metal pellets. All
such loose material was chipped out and the
affected surface was treated with a coat of bitumastic for waterproofing. Completion of these
stations was somewhat delayed because of late
equipment delivery.
Station 2300