127EAW26Q0049 - Loves Falls Bridge Repair

1 Replace FP-14 Section 557 with the following Supplemental Specification: Section 557—Timber Structures Description 557.01 Work. This work consists of fabricating, treating, erecting, and painting structural timber. This work also includes required lumber and hardware. Materials 557.02 Requirements. Conform to the following Section and Subsections of the specifications: Crushed Aggregate .............................................................. 703.06 Elastomeric Bearings........................................................… 564.04 Geotextile............................................................................. 714.01 Hardware ............................................................................. 716.02 Painting ............................................................................… 563 Structural Excavation............................................................ 208 Structural Glued Laminated Timber .................................... 716.04 Treated Structural Timber & Lumber .................................. 716.03 Untreated Structural Timber & Lumber ..........................… 716.01 Furnish the following compliance certificates to the CO upon delivery of the materials to the jobsite: (a) Verification of compliance with grading rules and species of timber and lumber. Provide certification by an agency accepted as competent by the American Lumber Standards Committee (ALSC). (b) Lot certification of each charge for preservative, penetration in inches, and retention in pounds per cubic foot (assay method) by a qualified independent inspection and testing agency. In addition, have the producer of the treated products provide written certification that Best Management Practices (BMP’s) in accordance with “Best Management Practices for Treated Wood in Western Aquatic Environments,” published by the Western Wood Preservation Institute (WWPI) and Canadian Institute of Treated Wood, where followed, including a description and appropriate documentation of the applicable BMP’s used. (c) Certification from a qualified inspection and testing agency indicating that all glued laminated members are in accordance with the requirements of American National Standard for Wood Products, “Structural Glued Laminated Timber” (ANSI/AITC A190.1), modified as SHOWN ON THE DRAWINGS. -- 1 of 14 -- 2 (d) Such other certifications as SHOWN ON THE DRAWINGS. Incise all glued laminated and solid sawn members thicker than 2 inches in accordance with AWPA standard C1, unless otherwise SHOWN ON THE DRAWINGS. Provide shop drawings for all timber 21 days in advance of fabrication when SHOWN ON THE DRAWING. Show all dimensions and fabrication details for all cut, framed, or bored timbers. Construction 557.03 General. Excavate and backfill according to Section 208. Furnish structural lumber and timber of the required stress grade. Clear weeds, rubbish, or other objectionable material from the ground under and in the vicinity of all stored material. Place the bottom layer of material at least 8 inches above the ground level. Provide sufficient support to prevent sagging. Open-stack untreated material to shed water. Stack material in layers on spacers (stickers) that extend across the full width of the stack to allow for free air circulation. Align all spacers vertically and space them at regular intervals. Close-stack treated material to shed water. Protect material from the elements . If covered, use sheet material such as water-resistant paper or opaque polyethylene film. Do not cover with impervious membranes, such as polyethylene film, during dry weather. Slit or puncture individual wrappings full length on the lower side to permit water drainage. Store and protect glued laminated timber in accordance with the recommendations for Loading and Handling, Job Site Storage, and Erection in “Recommended Practice for Protection of Structural Glued Laminated Timber During Transit, Storage, and Erection,” published by the American Institute of Timber Construction, AITC 111. Use slings or other devices to protect corners of heavy construction timbers and banded packages of lighter construction timber. Cut and form lumber and timber so joints have even bearing over their entire contact surface. Do not use shims in making joints. Close all joints. Drive nail and spike heads flush with the wood surface. Use the same end, face, and edge of the timber member for all layout dimensions. Bore holes from mating faces. 557.04 Treating Timber. Indicate the preservative used, penetration in inches (millimeters), retention in pounds per cubic foot (kilograms per cubic meter) (assay method). -- 2 of 14 -- 3 Fabricate timbers before treatment. Handle treated timber according to the Consumer Information Sheet published by AWPA. Do not cut, frame, or bore treated timber after treatment unless approved by the CO. Handle treated timbers carefully and do not drop, damage outer fibers, or penetrate the surface with tools. Do not use cant dogs, hooks, or pike poles. In coastal waters, do not cut or bore timber below the high water mark. Handle treated timber according to the AWPA published Consumer Information Sheet. Do not drip or spill preservative into the aquatic environment or onto the ground. Handle treated timbers to prevent damage to their surfaces. Do not use cant dogs, hooks, or pike poles. For timbers originally treated with pentachlorophenol, creosote, creosote solutions, or waterborne preservatives, field treat all cuts, abrasions, bolt holes, and recesses that occur after treatment with two liberal applications of a compatible preservative in accordance with the requirements specified in AWPA standard M4, Standard for the Care of Pressure-Treated Wood Products. Unless otherwise specified, copper naphthenate solutions may be used for field treatments of material originally treated with copper naphthenate, pentachlorophenol, creosote, creosote solution, or waterborne preservatives. Prepare the preser…