Demolition, site work, paving and new construction of a bridge / tunnel in Ridgefield, Connecticut. Completed plans call for the demolition of a bridge / tunnel; for the construction of a bridge / tunnel; for site work for a bridge / tunnel; and for paving for a bridge / tunnel.

Replacement of Bridge No. 07031 - Depot Road over Norwalk River This section covers authority, definitions, regulatory requirements, traffic regulations and coordination of the Contractor's work schedule with the operation of train service, construction equipment and safety requirements for working within the Railroad right-of-way, and provisions for storage of materials and equipment and worker safety rules. After the Engineer's Pre-construction meeting and prior to commencement of Contract activities, a "Working on The Railroad" meeting will be held by the Engineer to emphasis these Specifications. This work shall consist of excavating existing channel bottom material, herein referred to as natural streambed material, in areas where the channel bottom is to be disturbed and regraded to create a work area for a bridge, culvert, articulated concrete block placement, cofferdam installation, as shown on the plans or as directed by the Engineer. This item shall also include the stockpiling and protecting of the excavated material on-Site, subsequent placement, top dressing, or backfilling of the excavated stockpiled material within the watercourse, as shown on the plans or as directed by the Engineer. This work shall consist of procuring, transporting, and placing supplemental streambed channel material, herein referred to as supplemental streambed material, meeting the visual inspection requirements herein, along stream bank/channel improvement locations as shown on the plans or denoted on the Project's permit applications. This item shall also include any necessary temporary protection and stockpiling of the supplemental streambed material on-Site, subsequent placement, top dressing, or backfilling of the supplemental streambed material within the watercourse, as shown on the plans or as directed by the Engineer. Work under this item shall consist of designing, furnishing, installing, maintaining, and removing of a temporary water handling system. This may include water-handling-cofferdams, bypass pipes, bypass pumps/hoses, temporary energy dissipation, sump pumps, drainage channels, water handling for ancillary drainage, and dewatering. A temporary water handling system redirects water beyond, through, or around the limits of construction to allow work to be done in the dry. This work shall consist of measures to control water pollution and soil erosion which become necessary for the completion of the work, but for which no item is provided in the Contract. Such measures include: o temporary check dams, water bars, berms, dikes, dams o temporary sediment traps o pump settling basins o silt fence o inlet protection o hay bales o erosion control matting o fiber rolls, coir rolls, wattles o gravel, stone, riprap o mulch o permanent or temporary seeding o slope drains, ditches, channels, temporary drainage measures o dust control o topsoil o other erosion control materials, devices, or methods If a situation arises that requires immediate deployment of water pollution control measures, the Engineer will direct the Contractor to use this item to prosecute the work. If the Contractor proposes changes in construction methods or staging which would affect the as designed pollution controls, plans for revised pollution controls shall be submitted for the Engineer's approval prior to start of work. The Asphalt Adjustment Cost will be based on the variance in price for the performance-graded binder component of the following: I. Hot Mix Asphalt (HMA) and Polymer Modified Asphalt (PMA), II. Ultra-Thin Bonded HMA (UTB-HMA) and Ultra-Thin Bonded PMA (UTB-PMA), III. Thin Friction Wearing Course (TFWC), IV. Binder Rich Intermediate Courses (BRIC) and Stone Matrix Asphalt (SMA), and V. Asphalt Rubber Chip Seal (ARCS) treatments completed and accepted during the Contract. Work under this item shall consist of furnishing and installing an asphaltic plug expansion joint system (APJ) in conformance with ASTM D6297, as shown on the plans, and as specified herein. Work under this item shall also consist of the removal and disposal of bituminous concrete, membrane waterproofing, existing joint components and sealing elements, cleaning and sealing median barrier joints, parapet joints, and sidewalk joints. Work under this item excludes the removal of Portland cement concrete headers. Work under this item consists of furnishing and installing a seamless elastomeric waterproofing membrane system applied to a concrete or steel surface as shown on the plans, and as directed by the Engineer. Work shall also include conditioning of the surface to be coated, and all submittals and quality-control testing noted herein. The completed membrane system shall be comprised of a primer coat, reinforcing material as specified or directed, membrane coating (minimum total thickness of 80 mil and maximum total thickness not to exceed 120 mil), an additional 40 mil membrane layer with aggregate broadcast into the material while still wet, and an application of tack coat. The Contractor shall provide a condition survey of the existing building (Design Studio 5, LLC) adjacent to the bridge and railroad tracks within the project limits. The condition survey shall document the existing condition of the building and railroad tracksincluding cracks,settlement, and other deterioration prior to the commencement of work, after the completion of work, and at locations and times during construction as directed by the Engineer. Work shall include: o Conduct pre- and post-construction condition surveys. o Laying out, furnishing, installing, protecting, maintaining, monitoring, and preparing reports for all monitoring instrumentation: Crack Monitors, Deformation Monitoring Point, and Vibration Monitors. o Replacement of failed, damaged or stolen instrumentation. o Notifying the Engineer and taking immediate remedial action to prevent the Limiting Values from being reached. Meeting with the Engineer to review current field conditions to determine further steps to be taken, before exceeding the Limiting Values. o Making adjustments to the construction means and methods in order not to exceed the Limiting Values. o Removal of all monitoring instruments, Crack Monitors, Deformation Monitoring Points, and Vibration Monitors as specified herein, or as directed by the Engineer at the completion of construction activities. Work under this item shall consist of cleaning concrete surfaces of dirt, dust, and debris, and furnishing and applying a clear, penetrating sealer to concrete surfaces where shown on the plans, to provide a barrier against the intrusion of moisture and chlorides. This work also includes furnishing, installing, and removing platforms, scaffolding, ladders, and other means of access as well as shields, as required, to protect adjacent areas and traffic from overspray. This work shall consist of furnishing, installing, maintaining, and removing a 6' Temporary Chain Link Fence at the locations shown on the plans or as directed by the Engineer. The temporary fence shall be installed prior to the start of construction and shall remain in place until the start of construction on project 117-164 at Portland Avenue. The Contractor shall adjust the fence as necessary to complete the roadway work. This work shall include the development and implementation of an Invasive Vegetation Removal Plan (IVRP) to outline the identification and treatment methods for the control of invasive vegetation, including trees if present, as directed by the Engineer or their authorized delegate. This work will also include the removal and off-Site disposal of invasive vegetation from within the Project limits in accordance with the accepted IVRP. Under the item included in the bid document, adequate weatherproof office quarters with related furnishings, materials, equipment and otherservices,shall be provided by theContractorforthe duration of the work, and if necessary, for a close-out period determined by the Engineer. The office, furnishings, materials, equipment, and services are for the exclusive use of Municipal forces and others who may be engaged to augment Municipal forces with relation to the Contract. The office quarters shall be located convenient to the work site and installed in accordance with Article 1.08.02. This office shall be separated from any office occupied by the Contractor. Ownership and liability of the office quarters shall remain with the Contractor.