Construction

• Demolition
  This challenging project included complete removal and replacement of a concrete bridge carrying traffic across the existing O’Shaughnessy Dam.  The work included demolition of the existing structure, construction of new piers on top of the existing dam spillway, and construction of a box beam superstructure with a composite concrete deck and architectural precast concrete railings to replicate the original structure.

Landscaping and Fencing

• Excavation
  The project consisted of the construction and equipping of a new effluent system at the Southerly Waste Water Treatment Plant.  Included in the work were (4) reinforced concrete structures including a pumping station, metering chamber, transition chamber, and dissipation structure all with associated pre-cast and cast-in-place reinforced concrete conduits.  The dissipation structure required a permanent contractor designed cofferdam, excavation and grouted dump rock.  In total approximately 250,000 square feet of forms, 4,000,000 pounds of reinforcing steel and 20,000 cubic yards of concrete were placed as part of this project.
• Retaining Walls
  This fast-track project provided for the combination of the northbound and southbound lanes of I-71 into a common, lowered “trench” through the downtown business district.  This required construction of over 4,800 linear feet of inclined retaining walls, located along the northern and southern limits of the new trench, as well as the construction of five “platform” bridges spanning the mainline.

Exterior

• Residential Roof Replacement/Installation
  Mahan Completes Precast Panel Roof Replacement Ahead of Schedule C.J. Mahan Construction Company completed the Smithfield Food Packing Facility precast panel roof replacement a full two days ahead of schedule.  The $318,482 contract called for the replacement of 30 precast concrete roof panels weighing more than 10,000 pounds each in 5-days.  Mahan, however, was able to better that schedule by 2-days, completing the project in only 6 - 12 hour shifts.

General

• Electrical Work
  In partnership with Odebrecht, USA, C.J. Mahan Construction Company was responsible for all field operations and construction engineering for the project, which included construction of temporary retaining structures with work platforms, dewatering systems, steel and concrete pile foundations, reinforced concrete T‐walls, L‐walls, swing gate and gatebay type monoliths, gate assemblies, modifications to existing pumping station utilities, and miscellaneous mechanical and electrical work.