ConnDOT I-95 Resurfacing Bridge Safety Improvements

Tectonic performed resident engineering and surveying services for the ConnDOT’s resurfacing of approximately 2 miles of I-95 from Interchange 34 in Milford to Interchange 41 (Marsh Road) in Orange, CT.

The project included the cleaning and lining of culverts, improvements to the storm drainage systems, replacement of guide rail and trimming of trees along the shoulders. A total of 16 bridges were repaired on which entailed partial depth patching of the deck slab, placement of new membrane waterproofing and bituminous concrete wearing surface, placement of asphaltic plug expansion joints and construction of bridge parapet caps.

Tectonic also performed survey work for a major part of the roadway work for pavement wedging and milling in order to correct cross slopes and curve super elevation. Tectonic coordinated with the contractor to provide the designer existing condition information so corrective work could be designed. Periodic survey checks during the milling and wedging operations were performed to examine progress in achieving the desired cross slopes.

In addition, work was performed for the resurfacing of the northbound and southbound service areas and the installation of a fire standpipe on the Route 15 Bridge over the Housatonic River (Sikorsky Bridge).

Tectonic provided administration, inspection and progress of construction work, as well as the maintenance and protection of traffic (MPT) for the reconstruction of Andrews Avenue Bridge over the Long Island Rail Road Montauk and Bushwick Lines in the Borough of Queens.

Under this contract, Tectonic performed the following services:
• Demolition and removal of existing railings, bridge deck, curbs, superstructure framing, bridge columns to 300 mm below the ballast line, concrete abutments and wing walls, pavements, and retaining wall.
• Inspections for the construction of new pre-cast modular abutment stems, wing walls and concrete crib type retaining walls on both approaches.
• Installation of new elastomeric bearings at abutments.
• Construction of new bridge superstructure and concrete filled grating deck slab.
• Installation of pedestrian fencing on the bridge and both approaches.
• Construction of concrete parapet, sidewalk and approach pavement with roadway markings.
• Construction of new drainage and catch basins, and installation of new lampposts and underground feeder.
• Designating locations requiring protective sealing of structural concrete for existing bridge decks.

Tectonic provided inspection, management and coordination for the $60M installation of trunk water mains in the Jackson Square area, private utilities relocation, and capital work at 8th Avenue from West 12th Street to West 13th Street to connect Shaft 27B (Water Tunnel #3) to the distribution system in Manhattan.

Since contract plans indicated that the accuracy, extent and sizes of underground structures/facilities were not guaranteed, Tectonic developed a thorough subsurface investigative plan to accurately establish the profile types of City and private utilities within the impact zone of the proposed trunk and distribution mains, and appurtenances. Tectonic provided the following recommendations for minimizing the impact on the project time and budget:

• Coordination of a comprehensive schedule of test pits prior to approval of trunk main drawings.
• Addressing potential asbestos facilities and soil contamination encountered during excavation.
• Properly implementing joint bidding.
• Constant coordination with Con Edison to identify and mitigate interferences in the vicinity of oil-o-static facilities.
• Relocating electric and gas main facilities that lie parallel to the trunk mains.
• Identifying and mitigating steam interference.
• Working closely with NYC DOT to schedule construction in the nine intersections across the project and minimize traffic delays.
• Performing detailed evaluations of the designed locations of the 36” trunk main throughout the project.
• Coordination with NYC DOT and NYCT to relocate the four Manhattan bus lines within the project limits.
• Coordination of proper building access and noise mitigation for the residential and commercial properties located near the 8th Avenue area.

Tectonic provided construction inspection for a $73 million complex reconstruction of a 1.3 kilometers of major artery on U.S. Route 9 in Peekskill. Main element of work included major realignment of the existing roadway, the replacement of three Route 9 bridges (composite girders) over Requa Street, over Hudson Avenue and over Central Avenue; the replacement of Route 6 Bridge (composite girder) over Route 9; and the abatement, demolition and disposal of three buildings in the City of Peekskill.

In addition to the standard construction inspection services, Tectonic also provided services involving code compliance for NYSDOT maintenance facilities.

Responsibilities included resident engineering, contract administration, detailed technical inspections, on-site field testing of materials, field measurement and collection of data for final payments process, contractors partial and final payment estimates, coordination of contractor’s scheduling, processing RFI’s, preparation of daily IR’s and preparation of record as-builts. Tectonic also performed vibration monitoring and geologic mapping associated with the excavation of a major rock slope to accommodate the highway realignment.

Tectonic performed resident engineering, contract administration and inspection services for the NYS DOT’s construction of a new ramp from southbound 9A/100 to southbound Taconic State Parkway, and a new bridge over Route 9A/100.

Construction involved a new concrete deck and curved steel girder single span bridge on pile foundations, approach ramps and embankments, MSE retaining walls, partial cement, concrete, paving, asphalt super pave, drainage, guide rail and pavement markings.

Relocation of an existing pedestrian and bike trail was necessary to accommodate the alignment of the new approach ramp to the bridge. Staging of the bridge erection was coordinated with Con-Ed to accommodate the presence of overhead high voltage lines.

Tectonic’s responsibilities included resident engineering & inspection, contract administration, technical inspections, on-site field testing of materials, field measurement and collection of data for contractor payments, processing contractors partial and final payment estimates, coordination of contractors scheduling, conducting on-site progress meetings, coordinating with outside involved agencies, processing RFI’s, preparation of daily bi-weekly inspection reports, record keeping and as-built plan preparation.

Tectonic provided resident engineering and construction inspection services for the pavement milling and resurfacing of 8 bridges on I-87/I-287 between mileposts 23.09 and 29.54.

The project required night work and lane closures for the duration of construction. Lane closures involved traffic patterns that accommodate ramps at various locations within the work limits.

The main components involved:

• Milling (1 ½ “) and repaving bridges at MPs 23.09 (NB), 23.93, 25.10, 25.52, 25.53, 26.87, 29.41 & 29.54.
• Full depth asphalt milling and repaving (after deck is milled and before repaving, map out future structural deck repairs) at MP 23.09 southbound.