Attachment 2 - 811 Blading.pdf
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- Attached to
- OHV Trail Maintenance
- Solicitation number
- 127EAY26Q0138
- Issued by
-
Department of Agriculture Forest Service
About this file
This is a federal specification document for road maintenance work, specifically Section 811 Blading (October 2016 revision).
The specification defines blading services required to maintain roadbeds in serviceable condition. Work includes surface blading of native or aggregate roadbeds to facilitate traffic and provide proper drainage, and smooth blading to remove loose surfacing materials from wheel paths while storing removed materials in recoverable windrows. The specification requires shaping of crowns, slopes, berms, and drainage dips to uniform standards with a minimum crown or cross-slope of one-half inch per foot of width, not exceeding three-quarter inch per foot. Surfacing materials must be loosened to a minimum two-inch depth or the full depth of potholes and corrugations. The Contracting Officer has discretion to order compaction, which is accomplished by breaking track with operating equipment on the traveled way unless special compaction equipment is required. Water application during blading is required only when insufficient moisture is present to prevent segregation and is coordinated with Section 891 specifications. For smooth blading operations, loose materials must be windrowed to maintain minimum traveled way widths of eleven feet for single-lane segments or twenty feet for two-lane sections, with drainage holes required every 500 feet to prevent water collection.
Measurement and payment are based on five pay items: 811 (1) Blading Surfaced Roads at single-lane mile rates; 811 (2) Blading Native and Pit Run Roads at single-lane mile rates; 811 (3) Smooth Blading at single-lane mile rates; 811 (4) Berm Maintained at linear foot rates; and 811 (5) Establishing Berms at linear foot rates. Two-lane roads are measured as two single-lane miles rounded to the nearest one-tenth mile. Each intersection bladed receives credit as one-tenth single-lane mile unless the intersecting side road is scheduled for subsequent blading under this section. The specification prohibits back slope undercutting, requires removal of materials from structures such as bridges and culverts, and mandates maintaining existing berms to adjacent segment conditions when ordered.
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Text version
811 BLADING (10/16)
1. DESCRIPTION
This work consists of
a. Surface blading native or aggregate roadbed to a condition to facilitate traffic and provide proper drainage.
b. Smooth blading to remove loose surfacing materials from the wheel paths and store the removed materials in a recoverable windrow.
Blading includes shaping the crown or slope of traveled way, berms, and drainage dips in accordance with this specification. Compaction is required when ordered by the
Contracting Officer.
2. MAINTENANCE REQUIREMENTS
a. Timing
Surface blading shall be performed during the contract period as ordered by the
Government.
b. General
1) The existing traveled way and shoulders, including turnouts unless otherwise ordered, shall be bladed and shaped to produce a surface which is uniform, consistent to grade, and crowned or cross-sloped as indicated by the character of the existing surface unless otherwise shown in the Road Listing, to at least one half inch (1/2") per foot of width, but not more than three quarter inch (3/4") per foot of width. Surfacing materials shall be thoroughly loosened to no less than 2 inch depth or the depth of potholes or corrugations. Scarification to facilitate cutting to the full depth of potholes or corrugations may be elected by the Contractor but will be considered incidental to blading. Scarification shall not go deep enough to cause contamination of the surfacing.
2) When Section 891 is included in the Road Listing, the Contractor shall apply water during blading when sufficient moisture is not present to prevent segregation. Water supply, hauling, and application shall be in accordance with Section 891 and shall be incidental to blading unless Pay Items for Section 891 are included in the Schedule of Items.
3) Existing native, rock or aggregate surfaced drainage dips shall be shaped incidental to blading to divert surface runoff to existing outlet devices, ditches and discharge locations.
4) The Contractor shall establish a blading pattern which provides a uniform driving surface, retains the surfacing on the roadbed and provides a thorough mixing of the materials within the completed surface width. Upon final blading, no disturbed rock shall protrude more than two (2) inches above the adjacent surface unless otherwise provided in the contract. Material not meeting this dimension shall be removed and placed outside the roadbed so as not to obstruct drainage ways or structures. This material may be scattered off the roadbed if there is free drainage.
5) Watering will not be required for smooth blading. Smooth blading shall be accomplished without distorting the existing cross-slope or crown of the traveled way. Loose surfacing materials shall be moved and stored on the high side of super-elevated curves and sections with uniform inslope or outslope. In crowned sections, the material shall be stored on either or both sides as elected. Stored materials shall be windrowed and shall be placed to provide not less than eleven (11) feet of smoothed traveled way on one- lane segments or twenty (20) feet of smoothed traveled way on two-lane or sections with turnouts. Windrows which may collect water on the road shall have holes cut through for drainage at least every 500 feet.
c. Routine Blading
1) Upon completion of blading, the surfaces shall conform to the dimensions shown in the Special Project Specifications 811-3.
2) Roadbed width in excess of the dimensions shown shall be shaped only as needed to provide drainage away from the traveled way. Established grasses and other vegetation shall not be removed from the excess width except as incidental to providing drainage or unless otherwise provided in the contract.
d. Compaction
Roads requiring compaction will be included in the Road Listing. Unless otherwise specified, all traveled ways requiring compaction shall be compacted by breaking track while operating equipment on the traveled way.
e. Intrusions
Where the minimum width shown in the Special Project Specifications is not available, the Contractor will construct berms where ordered and marked on the ground. Material to provide berms will come from sources designated in the Special Project
Specifications.
f. Undercutting
Roadway back slope shall not be undercut.
g. Intersections
1) At intersections, the roadbeds of side roads which are not closed or restricted from vehicular use shall be bladed to assure smooth transitions.
2) Field evidence of closure or restrictions shall be considered to be signing, cross ditching in the road surface (traveled way), earth berms or other devices placed to discourage or eliminate use by passenger cars, also roads listed for work under
Sections 835 or 838 shall be considered restricted.
3) Side roads listed for work under this Section shall be considered as not restricted.
h. Cleaning of Structures
Materials resulting from work under this Section shall not be allowed to remain on or in structures, such as bridges, culverts, cattleguards, or drainage dips.
i. Berms
Existing berms shall be maintained to the condition of adjacent segments when ordered by the Government.
3. MEASUREMENT
a. Measurement under this Section will be made by the total number of units for each item listed in the Schedule of Items completed and accepted.
b. Measurement for blading will be single-lane mile measured along the centerline of the roadway (see quantity measurement terms). Two-lane roads will be measured as two
(2) single-lane miles. Measurement will be measured to the nearest one-tenth (0.1) mile.
c. Each intersection bladed under 2.g. will be equivalent to one-tenth (0.1) single-lane mile; however, when the intersecting side road is scheduled for subsequent blading under this Section, no measurement will be made.
d. Berm maintained or established will be measured by linear foot.
e. No measurement will be made under this Section for compaction method specified in
2.d. For roads needing compaction with special compaction equipment (ie. pneumatic or steel roller), use pay items in Section 807 for additional compaction efforts.
4. PAYMENT
a. The quantities measured and accepted will be paid for at the contract unit price shown in the Schedule of Items.
b. Payment will be made under:
Pay Item Description Pay Unit
811 (1) Blading Surfaced Roads Single-Lane Mile
811 (2) Blading Native and Pit Run Roads Single-Lane Mile
811 (3) Smooth Blading Single-Lane Mile
811 (4) Berm Maintained Linear Foot
811 (5) Establishing Berms Linear Foot
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