961_materials_std.doc

Section C

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Section 961 -- Materials

961.01 Rock. Use sound, durable rock free of rifts, seams, laminations, and minerals that could deteriorate as a result of weathering. Dress rock to remove thin or weak portions before use.

Furnish rock of the size, shape, weight, and face area necessary to produce the general characteristics and appearance SHOWN ON THE DRAWINGS.

961.02 Native Timber. Select timber from sites on Government-administered land. Select sizes of material as SHOWN ON THE DRAWINGS. The preferred species of material to be used shall be Douglas-fir, western larch, lodgepole pine, or whitebark pine, in that order. Spruce or alpine fir shall not be used unless the preferred species are not available within 600 feet of the installation site. Select timber that is straight, sound, and free of defects. Fell trees to prevent damage to standing timber and to minimize breakage of trees to be used. Buck logs from felled trees in such a way to minimize waste and to obtain the required length and diameter.

Peel all logs and stakes, square log ends, and trim the knots and limbs flush. Scatter the debris from the processing of timber away from the trail, not in openings and meadows, and so it will not plug water courses.

961.04 Culvert. Use coextruded dual wall corrugated Polyethylene (PE) pipe with a smooth interior wall and a corrugated exterior wall. Sizes 12 inches and larger shall meet the requirements of AASHTO M 294. Sizes 10 inches and smaller shall meet the requirements of AASHTO M 252.

961.05 Geotextiles. During shipment and storage, wrap all geotextiles to protect them from sunlight. When storing geotextiles, protect them from mud, soil, dust, and debris. If materials are not installed immediately after delivery to site, do not store them in direct sunlight.

(a) For applications other than for silt fence, use needlepunched nonwoven fabric meeting the following requirements:

* Minimum average roll value.

The following brand name products meet the above requirements:

Synthetic Industries - Geotex #451

Amoco - ProPex #4551

(b) For silt fence applications, use woven fabric meeting the following requirements:

@ 500 hours

* Minimum average roll value.

The following brand name products meet the above requirements:

Synthetic Industries - Geotex #913SC

Amoco - ProPex #2130

961-1 (1/10/2010)