S-10-0296 915_reconstruction_.doc

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Section 915 -- Existing Trail Reconstruction

Description

915.01 Work. Work consists of restoring the original trail template, including clearing, removing slough and berm, filling ruts and trenches, placing borrow, reshaping backslopes, excavation, retreading, restoring drainage and other trail structures, constructing check dams, tread stabilization, and removing protruding rocks, roots, stumps, slough, and berms.

The Trail Log describes work that was apparent on the date SHOWN ON THE TRAIL LOG.

Sections of the trail that are within areas covered by a pay item shall meet all specifications for that pay item even if no work is described on the Trail Log.

Materials

915.02 Requirements. Use materials meeting the requirements of Section 961.

Construction

915.03 Clearing and Grubbing. Clear and grub in accordance with the requirements of Section 911 and as SHOWN ON THE DRAWINGS.

915.04 Excavation and Embankment. Excavate and place all excavated material in accordance with the requirements of Section 912 and as SHOWN ON THE DRAWINGS.

915.05 Rock and Root Removal. Scatter the removed rocks and roots below the trailway to ensure no blockage of watercourses or creation of a windrow. Fill holes with suitable compacted material and retread the disturbed area.

915.06 Slough and Berm Removal and Excess Material. Remove berm where NOTED ON THE TRAIL LOG. Remove berm through areas where retreading is NOTED ON THE TRAIL LOG when daylight can be obtained within a distance of 2 feet from outslope edge of finished tread.

Use suitable slough and berm material within the trailway to restore the trailbed as SHOWN

ON THE DRAWINGS. Scatter excess and unsuitable material beyond the downslope edge of the trailway. Do not obstruct drainage or create piles, berms, or windrows of debris.

915.07 Fill Material, and Borrow. Use suitable material to fill ruts, trenches, and potholes in the tread that cannot be leveled and outsloped through performance of work in Subsection 915.06. Compact and shape as SHOWN ON THE DRAWINGS.

Where NOTED ON THE TRAIL LOG or SHOWN ON THE DRAWINGS, install geotextile fabric prior to placing borrow. Place the fabric flat on the trailbed so that it will not be visible after borrow has been placed and compacted. Overlap adjoining pieces of fabric a minimum of 24 inches.

915.09 Drainage. Restore drain dips and ditches to reestablish drainage as SHOWN ON THE DRAWINGS by removing obstructions such as rocks, roots, and sticks to make ditches and culverts free draining.

Install the permanent drainage structures NOTED ON THE TRAIL LOG or temporary drainage upon completion of tread restoration work.

915.10 Stream Channel Cleaning. Clean channel of obstructions in areas NOTED ON THE TRAIL LOG. Remove debris and rocks from the stream channel and scatter outside of the side slopes of the stream channel and beyond the clearing limits.

915.12 Retreading and Finishing Trailbed and Backslopes. Where retreading is NOTED ON THE TRAIL LOG work shall include removal of roots and rocks. Provide a firm and uniformly finished trailbed in accordance with the requirements of Section 912 and as SHOWN ON THE DRAWINGS.

Where retreading around trees is NOTED ON THE TRAIL LOG, cut roots 18"- 24" beyond tree trunk and retread out beyond the tree far enough to provide the required pack clearance.

When retreading around rocks and trees, keep trail grade same as prevailing grade.

Provide a uniform and roughened surface on disturbed backslopes in accordance with cross-sections SHOWN ON THE DRAWINGS. Cut all roots flush with the backslope.

Measurement

915.13 Method. Measure the quantities in accordance with Section 906.

Payment

915.14 Basis. Pay for the accepted quantities in accordance with Section 906 at the contract unit price for each PAY ITEM SHOWN IN THE SCHEDULE OF ITEMS.

Grubbing and removing of stumps and roots will be considered incidental to Tread Work and Grubbing.

Select borrow, geotextile fabric, and outlet ditches will be considered incidental to the PAY ITEMS SHOWN IN THE SCHEDULE OF ITEMS.

Make payment under:

PAY ITEM

PAY UNIT

915(01) Reconstruction Clearing

LF

915(02) Reconstruction Tread Work and Grubbing

LF

915-3 (12/11/2009)