The 489-D Coal Pile Runoff Basin (CPRB), 484-10D Waste Oil Facility (WOF), and D-006 Outfall were all portions of the D-Area Powerhouse subunit located at the Department of Energy’s Savannah River Site in Aiken, SC to be closed per the scope of this project. Pangea was awarded a design/build contract from Savannah River Nuclear Solutions which required the design and removal of contaminated sediments at the D-006 Outfall, design and removal of contaminated soils at the 484-10D Waste Oil Facility, design and resizing of the Coal Storage Area with accompanying stormwater runoff work, design and closure of the northern 25% of the Coal Pile Runoff Basin with consolidation of contaminated material under a 2 foot soil cover over the closed northern portion of the CPRB. The 484-D Powerhouse remained operational during the project, which required coordination to minimize disturbance of coal delivery and movements. This project was performed entirely in-house by Pangea.

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Since 2005, Pangea, Inc. has completed over $11M in projects for the Ameren Energy Delivery group headquartered in St. Louis, MO. These projects have included the repair, retrofit, expansion, and new construction supporting the Ameren transmission and distribution grid throughout Missouri and Illinois.

The scope of work has varied widely between these sites. Specific tasks have included the installation of hundreds of steel reinforced concrete piers and foundations used to support a variety of substation transformers and structures. Other self-performed work has included acres of site grading, construction of access roads and parking areas, installation of storm sewer pipe and subsurface drainage structures, rock placement, installation of retaining walls, and the installation of Spill Prevention, Containment and Control (SPCC) compliant storm water collection systems on expanded substations and on new substation sites. Activities include:

• Excavation, Concrete and Steel Work
• Oil Stop Valve Installation
  
• Liner Installation
  
• Manhole Renovation/Replacement
  
• Duct Bank Construction
  
• Power Plant Construction Support Services
  
• HDPE Piping including New Wet Scrubber Lines and Gypsum Stack Force Mains
  
• Liner Work
  
• Dam Repair/Soil Conditioning
  
• Storm, Sanitary and Water Lines
  
• Plant Parking/Perimeter Security

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Pangea, Inc. was contracted by Solutia, Inc. to perform work on the Dead Creek Segment B Liner Project. Segment B of the Dead Creek channel is located between Queeny Avenue and Judith Lane and spans between Sauget and Cahokia, Illinois. The project encompassed both the western and eastern sides and is approximately 2,400 feet long, spanning the creek channel. The project included clearing and grubbing, removal of the previous creek bed liner, reshaping the channel contours, installing both a geotextile and geomembrane liner, and placement of riprap bedding, riprap, and an articulated concrete block revetment protection system.

The Scope of Work included the following:

• Clearing and grubbing of the creek channel area
  
• Erosion, sediment and storm water control
  
• Removal of the existing geotextile fabric
  
• Segregation and storage of the geotextile fabric for subsequent disposition by the owner
  
• Alteration of the existing sub-grade to match desire contours (cut and fill, backfill)
  
• Construction and verification of a sub-grade layer for liner and surface features
  
• Construction of new liner system (geotextile and HDPE geomembrane)
  
• Deployment of protective surface features (bedding stone, riprap)
  
• Deployment of Articulated Concrete Block (ACB) revetment system

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Pangea reconstructed the entire active sanitary sewerage system at the Iowa Army Ammunition Plant (IAAP), Middletown, IA. Pangea replaced or improved over 80,000 lineal feet of gravity sewer, 2000 lineal feet of force mains, 2 lift stations, and over 300 manholes. The existing sewerage system was installed in the early 1940s and had developed significant groundwater infiltration. The rehabilitation of the sewers was completed by the wholesale replacement of the existing pipe or by the use of “cured-in-place” (CIP) pipe that is installed within the existing conduit.

Pangea and our design team determined a realignment of the new sewerage system under a Value Engineering effort that decreased the quantity of pipe replaced by over 6000 LF, eliminated the need for approximately 15 manholes, and by-passed major structures that were decrepit or otherwise not functioning properly. Our client realized savings of over $250,000 associated with the Value Engineering design. The realignment also eliminated construction through one of the most environmentally sensitive areas of the plant along Brush Creek. This increased the savings of costs and schedule by eliminating the need for special permits and wetlands considerations in the design and construction of the sewerage system.

Portions of the work were conducted in areas contaminated with explosive constituents and hydrocarbons. Pangea provided in-house resources to identify, monitor, and proper disposition of the wastes encountered from Pangea’s environmental division. The use of in-house personnel resulted in further cost savings for our client.

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The Red River Army Depot (RRAD) Main Gate Access Control Point (ACP) Guardhouse Redesign consisted of designing and building an Access Control Zone within RRAD’s Main Gate. This project focused primarily on the “access control zone, which encompasses traffic management and infrastructure. The project involved the demolition of the existing Guard House and concrete traffic islands. The work included:

• Installation of two Level-3 Guard Booths, equipped with left and right access doors, on newly constructed raised concrete traffic islands
  
• Impact Attenuators
  
• Electrical power and control wiring to each Guard Booth and Gate House to accommodate lighting,
• CCTV, and Duress Alarm in the Gate House
  
• Design and construction of a new inbound search lane and search area complete with canopy

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Pangea was awarded the Oak Ridge National Laboratory (ORNL) North Hill Parking Lot Project subcontract by UT-Battelle. Additional duct bank and underground power modifications were included. The primary scope of the project was the installation of a new parking lot and paved access road. The work was performed on the main campus of the ORNL in a lower security area of the site.

The major project activities included:

• Clearing and Grubbing
  
• Transformer installation and Power Supply modifications
  
• Site Grading, hillside / site excavation (including boulder removal)
  
• Electrical Duct Bank and Power / Communication Cable installations
  
• Storm Water Drainage System
  
• Backfill and Grading
  
• Segmented Retaining Wall Installation
  
• Prep, grading and paving of access road
  
• Sidewalk installations
  
• Asphalt Paving
  
• Exterior Bollard and Pole Light installations

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