projects Category: DEMOLITION, REMEDIATION AND ABATEMENT

NORWICH STATE HOSPITAL COMPLEX DECOMMISSIONING & DEMOLITION

Originally built in 1904, the Norwich State Hospital grew over the decades to a 400 acre campus and amassed close to 60 structures before the State of Connecticut officially closed its doors in 1996.  In 2009, the state sold the property to the Town of Preston to make way for the future development called the Preston River Walk.  In 2010, Manafort Brothers, Inc. entered into a partnership agreement with the Town of Preston Redevelopment Agency (PRA) to facilitate the clean up of the property, which included abatement, demolition, and remediation of over 50 buildings, some four and five stories and over 200,000sf in size, connecting underground tunnel systems and PCB contaminated soils and building components.  All told, Manafort successfully removed and abated approximately 1.4 million square feet of buildings under our agreement.

In addition to the abatement and demolition of the existing campus structures, Manafort’s scope was expanded to also include excavation and relocation of impacted soils throughout the site.  During the facility’s 90+ years in operation, the base material used for their roads and travel-ways throughout the campus was predominantly coal ash from the facility’s on-site boiler and heating plants.  Before beginning construction of their newly proposed Riverwalk complex, over 90,000cy of asphalt and associated bedding material throughout over 20 “Areas of Concern” needed to be excavated to varying depths and placed into two (2) large Consolidation Areas then capped with clean fill.  At the time of completion, Manafort will have excavated, hauled, and capped over 200,000cy of impacted and clean material.  Manafort worked hand-in-hand with the PRA and their environmental monitoring and engineering firm Tighe & Bond to successfully complete all remediation activities. 

 

All work was performed successfully on-time and on-budget, in partnership with PRA and project stakeholders.

ROUTE 8 BRIDGES REMOVAL & REPLACEMENT

The CTDOT – Design Build Removal and Replacement of Bridges 03761, 03762, 03764, and 03765 along RT 8 in Bridgeport, CT, was the first Design Build Project performed for the Connecticut Department of Transportation.  This Accelerated Bridge Construction Project consisted of the demolition of 16 bridge spans and the design and construction of 10 new replacement bridge spans.  The work included demolition of the existing bridges, new bridge superstructures, bridge substructure repairs and modifications, cast-in-place concrete walls, earthwork, and roadway construction.

All work was performed using Accelerated Construction Techniques.  Manafort collaborated with its Design Build Partner WSP Parsons Brinckerhoff to develop a detailed design that supported these Accelerated Construction Techniques most notably including onsite prefabrication of the bridge superstructure units.  The bridge superstructure demolition, reconstruction, over 30,000 cy of roadway and structural fill, and highway approach work were all completed ahead of schedule, four days less than the two 14-day shutdown periods allowed by CTDOT.  Through detailed planning, prefabrication, scheduling, and coordination, it is estimated that Manafort completed two construction seasons’ worth of work during these two 14-day shutdown periods.

 

The project was completed under budget, ahead of schedule, and was the recipient of a number of regional and national industry awards. Manafort served as The Design Build Prime Contractor for the project and self-performed a majority of the work including demolition, excavation, cast in place concrete, onsite prefabrication of bridge superstructure units, road and highway work.

MAINE YANKEE NUCLEAR POWER PLANT DECOMMISSIONING & DEMOLITION

The Maine Yankee Nuclear Power Plant in Wiscasset, Maine, was the first Nuclear Power Generating Facility in the United States to be decommissioned and demolished. Manafort completed this successful decommissioning and demolition in 2006, working directly for the Maine Yankee Atomic Power Company. The Plant was a 920 MW Pressurized Water Reactor (PWR) with attendant equipment and facilities. The Plant was commissioned in the mid-1970’s and operated until it shut down in the mid-1990’s due to the discovery of cracks in the plant’s steam generator tubes. Manafort’s scope of work included decommissioning, commodity removal, and demolition of the following structures:

 

Circulation Water House • Turbine Pedestal • Turbine Building • Containment Structure
Containment Structure Polar Crane • Steam & Valve House • Spray Building
Service Building • Control Room • Transformer • Demineralized Water Storage Tank
Reactor Water Storage Tank • Generator • Met Tower  • Information Center • Various Warehouses

 

Being the first removal of it’s kind, Manafort was challenged to creatively develop safe and successful methodologies to decommission and demolish these structures. Manafort drew upon its extensive demolition and construction experience along with a team of industry experts to do so. Examples of our creative solutions to the project challenges included:

• The use of explosives to percussively weaken the heavily reinforce concrete Turbine Pedestal to allow demolition with the use of large Excavators and Hydraulic Hammers.
• The use of explosives to implode the Turbine Building to allow safer demolition at grade.
• The use of large cranes and pick plans to dismantle transmission towers.
• The use of explosives to safely lower the Containment Structure Polar Crane to allow safer demolition at grade.
• The highly creative use of selective structure weakening and explosives to demolish the Containment Structure.

 

Manafort safely and successfully self performed all work on time and within budget through meticulous planning and execution in close coordination with the Maine Yankee Atomic Power Company.

CT YANKEE NUCLEAR POWER PLANT DECOMMISSIONING & DEMOLITION

The Connecticut Yankee Nuclear Power Plant in Haddam Neck, Connecticut, was one of the first Nuclear Power Generating Facilities in the United States to be decommissioned and demolished. Manafort completed this successful decommissioning in 2007, working directly for the Connecticut Yankee Atomic Power Company. The Plant was a 619 MW Pressurized Water Reactor (PWR) with attendant equipment and facilities.

 

The Plant was commissioned in 1968 and operated until it shut down in 1996 for economic reasons. Manafort’s scope of work included commodity removal, contaminated groundwater management, approximately 30,000 CY of contaminated soil removal and packaging, and the decontamination and demolition of the following structures to License Termination:

 

Diesel Generator Building Administration Building • Turbine Pedestal & Building Control Building for Septic • Power & Telephone Duct Banks Boiler Building • Waste Disposal Building Primary Auxiliary Building • Chemical Storage Warehouse Demineralized Water Storage Tank • Reactor Water Storage Tank Station Transformer • Intake Structure Discharge Structure • Reactor Containment Building Containment Building Polar Crane • Spent Fuel Building Information Center Building Private Branch Exchange (PBX) Room Septic System • Auxiliary Boiler Stack Structure 345 KV Towers Switchgear Building Service Building • Circulating & Service Water Piping Landfill Cleanup • Various Warehouses, Office & Yard Buildings.

Being one of the first decommissionings of it’s kind, Manafort was challenged to creatively develop safe and successful methodologies to decontaminate and demolish these structures. Manafort drew upon its extensive demolition and construction experience along with a team of industry experts to do so. Manafort safely and successfully self performed all work within the three year allotted schedule and within budget through meticulous planning and execution in close coordination with the Connecticut Yankee Atomic Power Company.