56 service tunnel. This tunnel i s 7 ft wide by 11 f't high by approximately 67 f't long. It passes under the southeast corner of the 7503 building and extends south and west outside the building. The floor elevation i s 833 f t 3 in. Normal access is from the service room on the 8L;o-ft level; however, a 3- by 3-f't hatch near the west end provides access from outside the building. This hatch i s normally closed by a sheet-metal-covered wooden l i d . Containment i s controlled by ventilation.
Typical Lube-Oil System f o r Fuel and Coolant Pumps.