626Scaling of Rock Slopes

626.1 Description

This Work consists of removi ng loose and potentially unstable rock on slopes as designated in the Contract. Scaling may be classified as eithe r Light Scaling or Heavy Scaling as designated in Section 626.3.2, “Designation of Scaling Types .”

626.1.1 Submittals

626.1.1 1 Work Experience

The Contractor shall provide written evidence to the Project M anager that demonstrates satisfactory completion of two (2) rock slope scaling Projects completed within two (2) years of the Bid date. Work crews shall be under the direction and over sight of a Scaling Supervisor who has at least 1,500 hours of high scaling experience and is trained and/or experienced in first aid and emergency rescue te chniques. Scaling crews shall have cumulative experience totaling more than 1,000 hours on Projects of similar scope and complexity to the Bid Project. The submittal shall include the names and resumes of Scaling Cr ewmembers and Scaling Supervisors, and shall include the names and Contact informatio n of references who can verify successful completion of evidentiary Projects.

626.1.1 2 Work Plan

The Contractor shall submit a detailed Work Plan for each non- contiguous rock scaling location to the Project Manager at least 30 days prior to the b eginning of Work. The Work Plan must be Accepted and approved by the Project Manager befor e any scaling Work may begin. If scaling is part of a larger construc tion Project, th e Work Plan shall be compatible with the overall traffic control Plan and sequence of operations for the larger Project. The Work Plan shall include the following: 1. Specific location, length and range in elevation of slopes t o be scaled; 2. Method or methods of scaling to be used and type of Equipmen t required; 3. A rope safety Plan with proposed rope access and methods of anchorage; 4. The number and size of rock scaling crews to be employed on the Project; 5. Sequence of operations and construction schedule; 6. Provisions to be made for pr otecting the Roadway and adjacen t facilities, Structures or property, including a temporary rockfall protection Plan tha t includes provisions for protecting the Roadway duri ng non-working hours against roc kfall, rollouts, etc.; 7. A removal and disposal plan for Material generated from the scaling Work; and 8. A traffic control Plan and hours of operation.

626.1.1 3 Review and Approval

The Project Manager will evaluate the Work experience and prop osed Work Plan. The Project Manager will notify the Contractor if additional inform ation is required and changes are necessary within 14 Days after receiving the submittals. Admin istrative approvals are subject to field verification of performance.

626.2 MATERIALS—Reserved

626.3 Construction Requirements

626.3.1 Preparations for Scaling of Rock Slopes

Scaling of rock slopes should co mmence only after all Work is completed for Controlled Blasting and Rock Excavation as covered in Section 203, “Excava tion, Borrow and Embankment,” to accomplish fi nal slope geometries as scheduled in the Plans. Scaling within the limits of a final backslope established by Controlled Blast ing is as covered in Section

203.5 2, “Work Included in Paymen t for Excavation, Backfill, an d Embankments.”

The Contractor shall begin scaling only after Roadway protecti on measures are in place and the approved traffic control Plans for specified Work windo ws are in place and as authorized by the Project Manager. Traffic shall be protected from potential rockfall for the duration of the scaling Project, to include rockfall that may o ccur outside of working hours. The Contractor shall be responsible for protecting the Roadway and all appurtenances from any damage that results from scaling operations and shall be re sponsible for repairing any such damage at no cost to the Department. The Contractor shall complete tree felling prior to performing other scaling Work. Temporary storage of felled tr ees in ditches shall not be permi tted. The Contractor shall provide the working foreman in accordance with Section 626.1.1.1, “Work Experience” to oversee t he crew of scalers during all sca ling Work. The Contractor shall not perform scaling without the scaling foreman on-site. No heavy Equipment other than those approved in the Work Plans shall be permitted on the slope. The Contractor shall begin scaling operations at th e top of the slope and proceed downwards, removing loose rock as the Work progresses. After c ompleting the first scaling pass, the Contractor shall remove any loose rock and debris tha t failed to fall co mpletely to the toe of the scaled area and shall continue scaling operations un til scaling has been completed to the satisfaction of the Project Manager.

626.3.2 Designation of Scaling Types

The extent of the scaling will be determined by the Project Ma nager and/or as specified in the Plans. Scaling of rock slopes is subdivided into Light Sca ling or Heavy Scaling of Rock Slopes as designated below based on Equipment, method, and size or rock to be scaled from slope.

626.3.2 1 Light Scaling of Rock Slopes

Light Scaling of Rock Slopes is designated for removal of indi vidual rocks less than one

626.3.2 2 Heavy Scaling of Rock Slopes

Heavy Scaling of Rock Slopes is designated for removal of indi vidual rocks greater than one (1) cubic yard in volume from the slopes or for rock remova l that requires use of heavy Equipment such as long-reach exca vators, cranes or similar mach inery; portable hydraulic wedges or hydraulic hammers; por table powered equipment such as air pillows, pneumatic hammers or wedges or portable drills; chemical cracking agents; or blasting with light explosives. If chemical cracking agents are used, the Contractor shall pro vide a detailed Plan to the Project Manager, including type of cracking agent, MSDS sheets, manufacturer’s technical Section 626: Scaling of Rock Slopes Page 709 data, hole spacing, and loading sequence. If explosives are us ed, the Contractor shall meet the applicable requirements of Section 203, “Excavation, Borrow , and Embankment.”

626.3.3 Execution of Scaling of Rock Slopes

Unless otherwise approved, traffic shall not be stopped by sca ling operations for more than 20 minutes at a time. The Roadway shall be sufficiently c leared of rock and slope debris during that 20-minute period to allow safe passage through the Work zone after each traffic stoppage. Damage to adjacent Roadway facilities and components, existing rockfall protection Structures and appurtenances, or adjacent local government or p rivate facility or property is not permitted unless specifically approved in the Work Plan. T he Contractor shall repair or replace any pavement, guard rail, signage, Structures, property or other components, public or private utilities, and any private property or facility damaged due to the scaling Work, at no expense to the Department. The Contractor shall provide adequa te means to protect motorists and surrounding property from injury and/or damage du ring rock scaling and all other activities, and is solely responsible for injury to perso ns or damage to property that may result from this Work. The Contractor shall conform to all Loc al, State, and Federal regulations for site safety, earthwork, and scaling, and shall obtain any necessary permits and/or licenses. Inspections may be conducted by the Project Manager at any tim e to evaluate scaling activities, check on the progre ss of Work or assess the stabili ty of the slope or individual rock blocks or masses. Adequate notice of the intent to inspect mus t be given to the Scaling Supervisor to allow time for cessation of scaling activities wh ile persons other than scaling crewmembers are on site. The Contractor shall provide 48 hours advance notice to the Project Manager before completion of the Work to allow for fina l inspection of the exposed face. Removal of rock and slope debris shall conform to the approved Work Plans, unless approved in advance by the Project Manager. Any additional roc k identified during inspections as potentially unstable shall be removed at the direction of th e Project Manager. Any large rock masses or blocks dislodged by scaling operations that are not transportable shall be reduced in size by mechanical or other approved means, and the Roadway shall be cleared of all debris and the site secured before it is re-opened to traff ic.

626.4 METHOD OF MEASUREMENT Light Scaling of Rock Slopes will be measured by the square ya rd of slope. Heavy

Scaling of Rock Slopes will be measured by the square yard of s lope.

626.5 Basis of Payment

Pay Item Pay Unit Light Scaling of Rock Slopes Square Yard Heavy Scaling of Rock Slopes Square Yard

626.5.1 Work Included in Payment

The following Work items will be considered as included in the payment for the main items and will not be measured or paid for separately: 1. Work Plan; Section 626: Scaling of Rock Slopes Page 710 2. Protection of Roadway and nearby facilities, Structures or pro perty; 3. Crushing, hauling and disposal of volume of removed rock and s lope debris Material; 4. Placement and removal of temporary rockfall protection barrier s; and 5. Repair and/or replacement of damaged facilities. The Contractor shall dispose of Material in accordance with Se ction 107, “Legal Relations, Environmental Requirements, and Responsibility to th e Public” unless otherwise specified in the Contract. The Contractor shall not dispose of Material within the Project limits without written approval from the Project Manager. Section 630: Glare Shields Page 711