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Pentagon Renovation Program
Heating and Refrigeration Plant Intake/Outfall Project
Project Description and Services Provided to Modern Continental by AMT: The Pentagon Memorial Renovation Project is made up of two separate worksites. Both sites are presently under construction. Prior to construction, AMT established survey control, provided as-builts for the location of many of the surface utility features, and verified the mapping. AMT then stake the intake pipe alignment and the shafts at either end. The Intake portion of the project encompasses the abandonment of a 72” intake pipe, which runs from Boundary Channel Lagoon to the existing H&RP (installed in 1944), and the construction of a new condenser intake line. The Intake portion of the site began with the construction of two (2) slurry shafts extending approximately 30' below sea level. The shafts were approximately 600' feet apart with one located on the south shore of Boundary Channel Lagoon and the other one located on the north side of the H&RP. The boring of the 60” intake pipe began in the shaft next to the H&RP and extended across Boundary Channel Drive, under the existing Pentagon Metro Line and into the Shaft at Boundary Channel Lagoon. Tolerance for entrance into the northern shaft was 0.08'. AMT's as-built data confirmed pipe location at 0.13'. With the pipe in position, construction of the Intake Structure and the Screenhouse could begin. Coffer dams were installed at both sites to prevent infiltration. AMT was responsible for staking out all structural features at various elevations within the Intake and Screenhouse structures.
The second worksite consists of the installation of a condenser outfall pipe from the H&RP to Roaches Run Waterfowl Sanctuary. This segment consists of extending a 60” pipe from the H&RP, across Old Jefferson Davis Highway, across an existing CSX Line and into Roaches Run Waterfowl Sanctuary. The majority of this construction is cut and fill with the exception of the CSX Railroad Line, where the pipe had to be bored under the tracks. Train service to the Washington area (VRE,AMTRAK,CSX) was not disrupted during this week long process. Tracks were monitored twenty-four (24) hours a day for seven (7) days during this phase of construction. A coffer dam has been constructed on the east shore of Roaches Run and construction is beginning on the outfall structure. AMT is currently preparing as-builts for every section of pipe in order for the project engineers to be able to adjust the pipe alignment as it is constructed.
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