Section_979_-_Special_Project_Spec.docx

Section 979 – Timber Trail Bench

Description

979.00.01 This work consists of furnishing, fabricating, constructing timber benches, including all required lumber, supports, hardware, excavation, backfill and fills as SHOWN ON THE PLANS. Construction of timber trail benches may be covered by one or more of the following subsections:

979.00.07 Concrete

Materials

979.00.02 Materials. Conform to the following sections:

Materials for Timber Structures 995

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 provided written certification that Best Management Practices (BMP) in accordance with “Best Management Practices for Treated Wood in Western Aquatic Environments”, published by the Western Wood Preservers Institute (WWPI) and Canadian Institute of Treated Wood, and were followed, including a description and appropriate documentation of the applicable BMP’s used.

(c) Such other certifications as SHOWN ON THE PLANS, or called or in the SPECIAL PROJECT SPECIFICATIONS.

Construction

979.00.03 General. Construct timber trail benches at locations, AS SHOWN ON THE DRAWINGS or WHERE DESIGNATED ON THE GROUND.

Clear stacks of 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 stickers vertically and space them at regular intervals.

Close-stack treated material to shed water.

Protect material from the weather. If covered, used 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 individual wrappings full length or puncture on the lower side to permit drainage of water.

979.00.04 Excavation and Embankment. Perform excavation and embankment in accordance with Section 911.

979.00.05 Hardware. Furnish and install hardware as SHOWN ON THE DRAWINGS.

979.00.06 Workmanship. Cut and form all lumber and construction timbers so all joints will have even bearing over the entire contact surface. Do not use shims in making joints. Construct all joints to be closed. Drive nails and spikes to set the heads flush with the wood surface. Use the same end, face, and edge of the timber member for all layout dimensions. Bore all holes from mating faces.

979.00.07 Concrete. Use dry-sack concrete bag mix, 4,000 psi minimum.

Payment

979.00.08 The accepted quantities shall be paid at the contract price per the unit of measurement for the Section 979 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this section. See Subsection 906.04.