03 Farnsworth Bridge Replacement SOW 260201.pdf

Allegheny National Forest Farnsworth Bridge Replacement

STATEMENT OF WORK

SCOPE OF CONTRACT

Provide all equipment, labor, materials, tools, and other incidentals and execute all work necessary to complete the bridge replacement. The work consists of demolition and disposal of the existing bridge, procurement and installation of the new bridge. All work performed will be completed in accordance with the designs, Standard Specification for Roads and Bridge on Federal Highway Projects FP-14 and the Forest Service Supplemental Specifications to the FP-14 (FSSS) included as part of this contract.

LOCATION

This project is located at the 5.4-mile point on Forest Road 154 in Mead Township, Warren County, Pennsylvania. The site is southwest of Clarendon Borough.

FARNSWORTH BRIDGE

Existing Bridge: The Farnsworth Bridge is at milepost 5.4 on Forest Road 154. This bridge was originally constructed in 1934 and provides access from Clarendon to Cherry Grove. The bridge provides access over the Farnsworth Branch of the West Branch of Tionesta Creek. The bridge has a concrete deck and is a single‐span steel, two‐girder bridge comprised of rolled steel I‐beams at centerline bearing to bearing length of 42.50 feet. Due to the steel beams, this bridge is considered to be fracture critical. The bridge is currently posted for a 3‐ton weight limit, which is the lowest allowable limit before the bridge will need to be closed for public safety.

Proposed Bridge: The full details on the proposed bridge can be found in the attached design package and project specifications. The proposed bridge replacement structure is a 56 foot (clear) single span, single lane, side by side box beam bridge with concrete abutments and cast-in-place (CIP) pile foundations. The proposed bridge is 18.625 feet wide (outside-to-outside) with a clear roadway width of 17.25 feet between steel railings. This bridge width is controlled by the width of the box beams and the size of the joints between each beam. The proposed superstructure consists of six (6) 36 inch wide by 21-inch-deep prestressed concrete box beams. The overall bridge span is 61 feet. The bearing elevation for this structure is 1 foot higher than the existing structure to allow for approximately 10 inches of freeboard during 100 year flood events. Additionally, straight back wingwalls (parallel with the road) are being proposed (in lieu of 45-degree wingwalls) to allow for better roadway grading at the concrete backwall, and better protection of the roadway approaches during high water.

GENERAL NOTES:

1. Prior to any earth disturbing activities, contractor shall call the Pennsylvania One Call System

(800‐242 1776) and all Oil and Gas Operators in the work area to determine locations of any underground utility lines.

2. A pre‐work conference will be conducted after the contract award.

3. Contractor shall install “ROAD CLOSED,” “TRUCK TRAFFIC” or “ROAD CONSTRUCTION AHEAD” signs during construction. Signs shall conform to the Manual on Uniform Traffic Control Devices (MUTCD). Contractors sign plan must be approved by Forest Service prior to work.

4. Farnsworth is a stocked and wild trout stream and has seasonal restrictions for in-stream work.

Unless a waiver is obtained from the state Fish and Boat Commission, no in-stream work can occur October 1 – January 1, nor February 15 – June 1.

5. Work hours will be during daylight hours, Monday thru Friday. No evening work or work on weekends or Federal holidays will be allowed without approval of the Contracting Officer.

6. The contractor shall be held liable and is responsible for any damage caused by their personnel or equipment to any pipelines, trees, culverts, signs, posts, riprap, or structures. Repair or replacement shall be at the Contractor's expense and at no additional cost to the Government. In addition, any damage done to underground or over‐ground pipelines or utilities owned by oil and gas operators will be repaired at the Contractor’s expense. Wounds on trees caused by contractor will be treated with a commercial tree dressing.

7. Mitigation for Non‐Native Invasive Species (NNIS) will be discussed at the pre‐work conference.

Maps of infestations and appropriate prevention and mitigation measures will be supplied and discussed. Construction Requirements and equipment cleaning for mitigation are as described in Supplemental Specification 151.

8. Within 10 days after award, the contractor will submit to the Contracting Officer, for approval, a plan of operation indicating the proposed timetable to complete the scheduled work activities.

Contractor shall notify the COR of any changes to the plan of operation by phone call or e‐mail.

9. Contractor is responsible to have in place a quality control system that will ensure work is performed in an acceptable manner. The Contractor will promptly furnish the COR with all inspection documents. Government Inspection are for the Government’s benefit.