SPECIAL PROVISION Description of Project, Scope of Contract, and Sequence of Work

Transcription

1 2004 Specifications CSJ: SPECIAL PROVISION Description of Project, Scope of Contract, and Sequence of Work 1.0 Description of Project 1.1. General. This project provides for the widening of FM 365 from existing 2-lanes to 4-lanes and adds a continuous left-turn lane from Texas Avenue Intersection to mile west of US 69 Overpass within the Port Arthur City limit. The project is approximately 2.4 miles long. The work to be performed under this contract consists of preparation of right of way, water and sewer line adjustments, replacing existing bridge over Main C Canal, extending cross road box culverts, embankment, excavation, replacing shoulder, raised median construction, 6 inch lime treated subgrade, 16 inch flexible base, prime, one course surface treatment over widen pavement, 1.5 inch type-d hot mix asphalt overlay for the widening portion, type D hot mix for leveling up the existing pavement, one course surface treatment over the entire roadway, 1.5 inch SMA-D overlay as final surface, driveway reconstructions, open ditch drainage, signing and pavement markings, traffic control plans and storm water pollution prevention plans Right of Way. Preparation of the Right-of-Way (ROW) for this project will be on the existing and the proposed ROW Traveling Public. Consider the safety and convenience of the traveling public passing through this project and using existing roads in the vicinity of this project to be an important function of this contract. Unless otherwise specified herein or approved by the Engineer, all existing streets shall be kept open to traffic Water Mains. The contract provides for relocation and adjustment of the City of Port Arthur water and sanitary sewer lines that are in conflict with the proposed construction Bridge Replacement The bridge construction on this project consists of reconstructing and widening Main C Canal Bridge from 44 ft. to 80 ft. wide Signing. The signing portion of this project consists of ground mounted guide, regulatory, and warning signs. All sign will have high-intensity reflective legends and backgrounds. The work includes fabricating, furnishing, and erecting sign mounts and sign panels. The signing work also includes removing various existing guide, regulatory, and warning signs Pavement Markings. The pavement marking portion of this project consists of installing raised pavement markers and reflective Markings. Pavement markings will consist of lane lines, edge lines, arrows and words. 1 of 5

2 1.8. Traffic Control Plan (TCP). The project s construction will be subdivided into two segments. The first segment from station to station will be constructed first and the remainder of project station to station to be constructed last. A more detailed description of traffic control plans is shown under traffic control plan phasing of this special specification Data on Existing Utilities. The contractors should note that pipelines and other underground installations are shown on the plans from best available information. Should the contractor encounter other utilities as sewers, waterlines, gas lines, etc., it shall be his responsibility to contact the respective utility companies or pertinent department of the City of Port Arthur as soon as it becomes apparent that such lines will interfere with the work. The State shall not be responsible for any delay in the work caused by the anticipated necessary adjustments of utilities unless specifically granted by the Engineer in writing. It shall be understood that if the contractor is delayed by virtue of the adjustment of utilities that this delay will not be considered as a basis for the claim by the contractor. All utilities, with the exception of water lines and sanitary sewer, are to be adjusted by their respective owners Sequence of Work General. The Contractor will not have the exclusive use of the right of way, but shall cooperate in the use of the right of way with Texas Department of Transportation contractors, various utility companies and their contractors, the City of Port Arthur and/or its contractors. No extra compensation will be made for any delays occasioned by work of other contractors or City forces; however, additional working time may be granted if, in the opinion of the Engineer, it is justified. Notice of extension of working time will be furnished to the contractor in writing. The construction sequence for this project will be as outlined and detailed in the plans. The TCP illustrates the sequencing of work for this project. It is the intent of the plans and specifications to require the Contractor to follow the sequences and operations as enumerated therein. However, should the Contractor wish to pursue a different procedure, provided traffic is maintained and priorities are met and construction established herein, may be submitted to the Engineer for approval. Any revisions to the TCP, which would alter the existing traffic lanes in an operation, will require approval of the Engineer in writing and will not be implemented without written approval Traffic Control Plan (TCP) Phasing. Prioritize widening of project from station to station Construct this portion of the project to the final width to the top of HMA Type D hot mix using the following sequence: Phase I Step 1: Westbound Shoulder Level-Up Install end barricades and construction signs for the entire length of project. Extend the existing cross road culverts located at station as directed by the Engineer. Begin adjustments of water and sanitary sewer lines per relocation plans. Prioritize adjustments of water and sanitary sewer lines in conflict with the Phase I Step 2 construction. Overlay the existing westbound shoulder from station to station to change the existing 6% cross slope to 2%. 2 of 5

3 Construct pavement within the grass median located at the east end of the project. Eliminate pavement edge drop off using embankment type A and seed to stabilize disturbed areas for westbound front slope. Phase I Step 2: Eastbound Widening Install portable concrete traffic barriers and Crash Cushion Attenuators at Main C Canal Bridge. Install signs, pavement markings and shift both traffic lanes to westbound side, station to Adjust water and sanitary sewer lines in conflict with the Phase I Step 3 construction. Demolish shown portion of the existing Main C Canal Bridge and construct the remaining eastbound half of the proposed structure. Mill the existing asphalt surface from the eastbound shoulder and remove the existing sand-shell base and stockpile for temporary use on driveways. Use of RAP material is allowed in Items 340 and 346. Construct the eastbound side ditch, driveway pipes, safety-end treatments and temporary driveways using salvaged sand-shell as needed. Stabilize disturbed areas using Construct 6 inch lime treated subgrade, 16 inch flexible base, prime, one course surface treatment, 1.5 inch type D hot-mix for the eastbound side and for the proposed raised median located between station to station Mill 1.5 inch by 6 foot wide at existing center line to provide a butt joint before levelingup the existing pavement using type D hot mix. Phase I Step 3: Westbound Widening Install work zone pavement markings and signs on the eastbound side. Relocate portable concrete barriers and Crash Cushion Attenuators at Main C Canal Bridge per TCP phase I Step 3 and shift traffic to newly widen eastbound side. Adjust water and sanitary sewer lines in conflict with phase II step 1 and step 2. Demolish the remaining portion of the existing bridge at Main C Canal and construct the remaining half of the proposed bridge. Mill the existing asphalt surface from the westbound shoulder. Remove the existing 12 Construct the westbound side ditch, driveway pipes, safety-end treatments and temporary Construct 6 inch lime treated subgrade, 16 inch flexible base, prime, one course surface treatment, 1.5 inch type D hot-mix for the westbound side. Construct curbs and colored concrete for the raised median from Station to Station of 5

4 Complete extension of the roadway cross culverts and the construction of safety end treatments. Construct the remaining portion of project, station to to the top of HMA Type D hot mix overlay using the following sequence: Phase II Step 1: Eastbound Shoulder Level-Up Overlay the existing eastbound shoulder from station to station to change the existing 6% cross slope to 2%. Extend the existing cross road culverts located at station , and as directed by the Engineer. Mill the existing roadway over LNVA Canal and approaches based on the field conditions to establish a minimum height of 2-2 for the existing concrete rails. Eliminate pavement edge drop off using embankment type A and seed to stabilize disturbed areas for eastbound front slope station to station Phase II Step 2: Westbound Widening Install work zone pavement markings, signs and shift traffic to eastbound side from station to station Mill the existing asphalt surface from the westbound shoulder. Remove the existing 12 Construct the westbound side ditch, driveway pipes, safety-end treatments and temporary Construct 6 inch lime treated subgrade, 16 inch flexible base, prime, one course surface treatment, 1.5 inch type D hot-mix and level-up where needed. Mill 1.5 inch by 6 foot wide at existing center line to provide a butt joint before leveling-up the existing pavement using HMA type D hot mix. Remove the existing metal beam guard fence and terminal anchor sections from LNVA westbound side and install retrofit anchor plates, metal beam guard fence transitions and crash cushion attenuators. Phase II Step 3: Eastbound Widening Install work zone pavement markings, signs, transition east of station and shift traffic to westbound side from station to Mill the existing asphalt surface from the eastbound shoulder. Remove the existing 12 Construct the eastbound side ditch, driveway pipes, safety-end treatments and temporary Construct 6 inch lime treated subgrade, 16 inch flexible base, prime, one course surface treatment, 1.5 inch type D hot-mix and level-up where needed. Mill 1.5 inch by 6 foot wide at existing center line to provide a butt joint before leveling-up the existing pavement using type D hot. 4 of 5

5 Remove the existing metal beam guard fence and terminal anchor sections from LNVA eastbound side and install retrofit anchor plates, metal beam guard fence transitions, metal beam guard fence, crash cushion attenuator and terminal anchor section. Complete extension of cross road culverts and safety end treatments. Phase III: OCST & SMA-D Surface Mill and overlay both ends of the project as directed by the Engineer. Construct one course surface treatment per proposed typical sections. Overlay 1.5 inch SMA-D final asphalt surface per proposed typical sections using BC standards for traffic control handling. Clean up, sod, install soil retention blanket, Cell Fiber Mulch seed, fertilize and water to establish vegetation. Install pavement markings, signs and open all lanes to final traffic configuration. 5 of 5