SPECIFICATIONS.pdf

SPECIFICATIONS

FOR THE REHABILITATION OF

VIRGINIA CREEPER TRAIL BRIDGES

GEORGE WASHINGTON AND JEFFERSON NATIONAL FORESTS

MOUNT ROGERS NATIONAL RECREATION AREA

I. GENERAL REQUIREMENTS – SUMMARY OF WORK

A. Contractor shall provide all labor, equipment, and materials to complete heavy maintenance/rehabilitation of Virginia Creeper bridges as shown on the drawings and/or specified herein.

B. Base bid work includes structural repair and replacement of bridge 27 and bridges 29 thru 34 as shown on the drawings.

II ACCESS

A. The Virginia Creeper is a rail-trail that the Norfolk and Western Railroad sold to the USDA – Forest Service and the towns of Abington and Damascus in

1970’s. The trail is now used for hiking, biking, and x-country skiing and horseback riding. Also, the trail is used by light vehicles for maintenance and rescue. No structural modifications to any bridges shall be allowed without prior Forest service review and written approval. All approved structural modifications shall be returned to their original configuration unless specifically directed by the Forest Service otherwise.

III LIMITATION OF OPERATIONS – PROJECT COORDINATION

A. No tracked or wheeled equipment shall be allowed in the stream (below live water surface) at any time year round.

B. No streamside/stream bank equipment access road shall be constructed.

C. No work of any kind shall be allowed from October 1 st thru October 31 st

No in stream work shall be allowed from October 1 st thru May 1 st

D. The trail shall remain open for public use at all times, minor construction delays (not to exceed 30 minutes) shall be allowed. Allowances shall be made at all times for public safety by proper signing and/or flagging. Other maintenance work may be on going by the Forest Service and/or other contractors. The contractor shall coordinate all activities as necessary to accommodate their work schedule to meet these requirements. Signing and flagging shall be in accordance with MUTCD for construction areas. A sign plan shall be submitted to and approved by the Engineer seven days prior to the beginning of any work.

E. A construction schedule shall be submitted in detail to the Engineer for approval seven days prior to any work. As a minimum each bridge shall be addressed as to when work shall begin and the order of repairs to each bridge.

F. At some bridge locations trail right of way is limited. See drawings for limits. All contractor operations shall remain within these limits.

IV. REMOVAL OF REPLACED MATERIAL AND DEBRIS

A. All demolished or replaced material shall be removed and disposed from

National Forest property.

B. Woody debris and trees lodged on bridge substructure units to be removed may be scattered 50 feet outside of the stream and trail as directed by the Engineer.

No woody debris or natural material shall be allowed to remain on private land.

V. STRUCURAL TIMBER AND LUMBER

A. Lumber and structural timber types, sizes and preservatives shall be as shown on the drawings.

B. All lumber and structural timber shall be new.

C. Abutments, piers, wing walls and bents shall be plumb and square to original bridge alignment and grade once repairs or replacement has been completed.

D. Certification as to the type and preservatives used on all lumber and timbers shall be submitted to the Engineer.

VI. HARDWARE

A. All hardware and post angles shall be hot dipped galvanized. All fasteners shall meet ASTM A 153 Class G185. Connectors shall meet ASTM A 653

Class G185 sheet. Furnish certification for galvanizing all hardware. Bolts and nail sizes not shown on the drawings shall match existing hardware sizes to be replaced. Contractor shall verify all hardware sizes. All hardware shall be new no existing hardware shall be used. Certification as to the type of galvanizing shall be submitted to the Engineer.

B. Structural stringer splice plates shall be as shown on the drawings. Sizes and plate steel treatment shall be as shown on the drawings.

C. Reinforcing steel shall be grade 60 when used to pin timber members together or when used as drift pins. Sizes shall be as shown on the drawings.

VII. CONCRETE

A. Concrete for structural foundation repair shall be 3000 psi. All concrete shall be formed square, plumb and straight to the dimensions shown on the drawings.

B. Contractor shall submit a de-watering plan to the Engineer seven days prior to any work on any in stream concrete work. No concrete or cement material shall be allowed to enter the stream during pouring of concrete repairs.

C. Reinforcing steel shall be grade 60.

D. Installation and providing of concrete and rebar shall be incidental to bridge substructure pay items.

E. A concrete mix design shall be submitted and approved by the Engineer prior to placement of any concrete.

VIII. STONE/RIP RAP

A. All stone and rip rap used shall be as per Virginia Department of Highway specifications. Sizes of stone and rip rap shall be as shown on the plans.

B. Installation and providing of stone and rip rap shall be incidental to bridge pay items.

C. Weight tickets shall be submitted with the VDOT certification of type and size of stone/rip rap.

IX. SEEDING

A. All disturbed areas shall be seeded within thirty (30) days of disturbance.

B. Seeding rates and types of seed required shall be as shown on the drawings.

X. SIGNS

A. Sign panels shall be aluminum or wood, fabricated in accordance with details shown on Attachments A, B, C, and D, contained within these special project specifications. The overall width of the sign panels shall be 42 inches.

B. Installation and providing of signs shall be incidental to other contract pay items. No separate payment shall be made for sign installation.