2-56 SECTION 206 – ROCK SLOPE SCALING
206.01 DESCRIPTION . This work shall consist of excavating loose and dilated rock on slopes. This work
includes high -angle construction to be completed via hand scaling using industrial rope access methods or machine scaling.
206.02 SUBMITTALS . The Contractor shall submit to the Engineer the following information for
completing the work. Work shall not begin until the submittals have been approved in writing by the Engineer.
a.Qualifications . Not less than 14 calendar days prior to beginning any rock slope scaling, the Contractor shall provide qualifications of Contractor’s personnel to the Engineer. The Contractor shall provide written evidence that the rock slope hand scaling foreman has a minimum of 5 years of demonstrated scaling experience as a foreman and rock slope hand scalers have a minimum of 2 years of demonstrated scaling experience. Operators for machine scaling shall have at least 1 year of demonstrated experience in machine scaling rock slopes.
b.Work Plan . Not less than 14 calendar days prior to beginning the work, the Contractor shall submit a detailed work plan for each rock slope to be scaled. The plan shall include:
1.The proposed rope access methods and safety plan.
2.The proposed construction sequence and schedule.
3.The types of equipment and tools to be utilized during the proposed work.
4.The number of rock slope scaling crews and the numbers of qualified working supervisors and qualified scalers in each crew.
5.The number of qualified machine sca ling operators.
6.Rock removal and disposal plan for rock debris generated from the rock slope scaling work.
7.Full details of protection measures to be used during rock slope scaling that shall protect the roadway from scaled rock. 2-57 (c) Field Repo rts. The Contractor shall submit a field report to the Engineer on a daily basis . The field report shall include weather information, work area, a brief description of work performed that day, description and cause of any delays, and number of crew hours a nd equipment hours for that day for each pay item.
206.03 GENERAL REQUIREMENTS . Prior to the beginning of ledge removal, all necessary clearing
and grubbing in the project area shall be completed in accordance with Section 201 . Vegetation removal performe d as part of hand scaling or machine scaling operations shall meet the applicable requirements of Section 201 . All material from previous activities shall be removed from the ditch line prior to beginning ledge removal. Work shall proceed according to the approved work plan and schedule submitted by the Contractor. Under no circumstances shall any material be pushed towards or over the crest of the rock slope, unless otherwise approved by the Engineer. Devices for protecting the roadway and adjacent facilities shall be provided by the Contractor and installed prior to the beginning of scaling.
206.04 HAND SCALING WITH VEGETATION REMOVAL . Hand scaling with vegetation removal
shall consist of removing lo ose, dilated or potentially dangerous rocks; cleaning out soil and weathered rock exposed during removal; and removing trees, root structures, and shrubs from the slope face using hand removal techniques requiring the use of rope access. Methods may includ e, but are not limited to, the use of standard steel miner pry bars and pneumatic or hydraulic devices. Slopes identified on the Plans shall be scaled at such frequency as required to remove all hazardous loose rock or overhangs. Slopes shall be scaled us ing a suitable standard steel mine scaling rod, bar, hand placed jacks, and inflatable air bags, as approved by the Engineer. Other methods such as hydraulic splitters or expansive grout may be used in lieu of, or to supplement, hand scaling upon approval of the Engineer. Scaling shall start at the top of the slope and work shall proceed downward, removing all loose rock blocks and vegetation as the work progresses. The rock face will be inspected by the Engineer and Geologist to determine whether the rock slope scaling has been completed. If other rocks, soil, or vegetation are identified that require removal, the Contractor shall continue to scale the slope until the scaling has been completed to the satisfaction of the Engineer. 2-58 206.05 MACHINE SCALING WITH VEGETATION REMOVAL . Machine scaling with vegetation removal shall consist of removing loose and dilated or potentially dangerous rocks; cleaning out soil and weathered rock exposed during removal; and removing trees, root structures, and shrub s from the slope face using heavy equipment such as excavators or specialized high -reach excavators. Attachments may include a hydraulic hammer, a bucket, or other attachments as necessary to complete the work. The work may be performed from the base of th e slope, top of the slope, or from work pads. Slopes identified on the Plans shall be machine scaled at such frequency as required to remove all hazardous loose rock or overhangs. Equipment used for machine scaling shall be as specified in the approved wor k plan.
206.06 REMOVAL OF LEDGE MATERIAL . When the scaling work is complete, all material from
inside the excavation line, as shown on the Plans, and all loose material from the rock slopes outside the excavation line shall be removed from the work area. Portable scales sufficient to weigh trucks with up to 12 wheels (i.e. tri -axle dump trucks) shall be provided by the Contractor. Trucks having more than 12 wheels will not be permitted. All trucks will be single -unit type. The scales shall be certified and sealed. Calibration shall be performed according to the manufacturer’s recommendations. Storage, placement, and handling of the truck scales shall be the responsibility of the Contractor. Any damage done to the truck scales by the Contractor’s operation s hall be the Contractor’s responsibility. Damaged scales shall be replaced or repaired to the satisfaction of the Engineer at no cost to the Agency. When scales are no longer needed, as determined by the Engineer, they shall remain the property of the Contractor. In lieu of providing portable scales, the Contractor may utilize local permanent truck scales for weighing trucks. Use of local scales shall be approved by the Engineer prior to beginning work. A printed load ticket, which indicates the truck i dentification, date, and time, shall be furnished to the Engineer for each load removed from the site.
a.Ledge Salvage Material . When applicable, the quantity of ledge salvage material specified in the Contract shall be salvaged to the state of Vermont.
b.Ledge Waste Material . Ledge waste material shall be disposed of in accordance with Section 105 . Material to be wasted on site shall meet the requirements of Subsection 703.05 . The material, when placed in the waste area, shall be leveled and walked in by bulldozer and need not be heavily compacted. 2-59 206.04 METHOD OF MEASUREMENT . The quantity of Hand Scaling with Vegetation Removal to be measured for payment will be the number of crew hours of qualified hand scaling performed in the complete and accepted work. The number of hours measured will be the number of hours worked by the scaling crew as a unit, pro -rated as necessary if the crew size differs from that specified . A scaling crew shall consist of three scalers and one scaling foreman. Hours worked by individual scalers will not be measured separately. No additional allowance will be made for premium time (overtime), foremen, superintendents, training, clothing, or equipment required. The quantity of Machine Scaling with Vegetation Removal to be measured for payment will be the number of hours of qualified heavy equipment used in the complete and accepted work. The quantity of Ledge Salvage Material to be measured for payment will be the number of tons of ledge material salvaged in the complet e and accepted work. Existing ledge material in the ditch line that is salvaged will be included for measurement. The quantity of Ledge Waste Material to be measured for payment will be the number of tons of ledge material removed in the complete and accep ted work. Existing ledge material in the ditch line that is removed will be included for measurement.
206.05 BASIS OF PAYMENT . The accepted quantity of Hand Scaling with Vegetation Removal will be
paid for at the Contract unit price per hour. Payment will be full compensation for hours of scaling operations accrued on the project; for furnishing all materials required; and for furnishing all labor, tools, equipment, and incidentals necessary to complete the work. The accepted quantity of Machin e Scaling with Vegetation Removal will be paid for at the Contract unit price per hour. Payment will be full compensation for performing the work specified; for furnishing, operation, and supervising the use of this equipment, including fuel, repairs, and attachments; and for furnishing all labor, tools, other equipment, and incidentals necessary to complete the work. The accepted quantities of Ledge Salvage Material and Ledge Waste Material will be paid for at the Contract unit price per ton. Payment will be full compensation for performing the work specified; including refining, handling, loading, transporting, and placing the specified materials; for breaking down large blocks of rock prior to removal from the site; and for furnishing all labor, tools, eq uipment, and incidentals necessary to complete the work. 2-60 Payment for preparing and making required submittals and for furnishing truck scales will not be made separately but will be considered incidental to the work under this section. Payment will be made under: Pay Item Pay Unit 206.1000 Hand Scaling with Vegetation Removal ................................ ................... Hour 206.1500 Machine Scaling with Vegetation Removal ................................ ............. Hour 206.3000 Ledge Salvage Material ................................ ................................ ............ Ton 206.3500 Ledge Waste Material ................................ ................................ ............... Ton 2-61 SECTIO N 208 – COFFERDAMS 208.0 1 DESCRIPTION . This work shall consist of the construction, material excavation within, dewatering, maintenance , and removal of cofferdams in accordance with the Contract. The work will be classified as follows:
a.Cofferdam . This item shall consist of providing a method for constructing, in the dry, a specific foundation or other component of a structure in accord ance with Contract requirements. This may involve the design, construction, maintenance, and removal of a watertight structure or may involve alternate methods of dewatering and stabilizing the specific site. Construction of foundation seals as specified i n the Contract or as required by Contractor plans and schedule of operations is also within the scope of work for the cofferdam item. The Contractor shall obtain any and all necessary permits or clearances for alternate methods.
b.Cofferdam Excavation, E arth. This item shall consist of all material excavated within the pay limits as set forth in these specification s or indicated on the Plans except solid rock, mortared stone masonry, concrete, and boulders measuring 0.5 cubic yards or more.
c.Cofferdam Excavation, Rock . This item shall consist of all solid rock material excavated within the pay limits as set forth in these specification s or indicated on the Plans, including all solid rock, mortared stone masonry, concrete, and boulders measuring 0.5 cubi c yards or more. 208.0 2 MATERIALS . Concrete used in a cofferdam foundation seal or for replacing overbreakage shall have a minimum 28 -day compressive strength of 3,000 psi and shall conform to the requirements of Section 541 . 208.0 3 GENERA L CONSTRUCTIO N REQUIREMENTS . The locations and ele vations for excavation shall be as indicated on the Plans. The Engineer may order removal of poor foundation material below the normal designated elevation and replacement with an approved material. All suitable excess excavated material shall be used in t he formation of embankment s as indicated on the Plans, or as directed by the Engineer. Unsuitable material shall be hauled and disposed of with no additional compensation to the Contractor.
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 196–200 of 1,380.