Section 262 — Slope Scaling

Description

262.01This work consists of removing and disposing of loose or detached blocks of rock from existing rock slopes and natural rock outcrops by slope scaling.

Construction Requirements

262.02Qualifications. Provide an on- site supervisor and p ersonnel with slope scaling project experience of similar scope and complexity to those shown in the plans and in similar conditions described in the geotechnical or geological reports. A t least 30 days before starting slope scaling work , submit the following for rope supported laborers:

(a)Scaling foreperson . A résumé for scaling foreperson describing at least 2000 hours' scaling experience and 3 years’ experience as a slope scaling foreperson on similar projects. Include required certifications;

(b)Journe yman scaler. A résumé for journeyman scalers describing at least 1500 hours’ scaling experience and at least 1 year’s experience on similar projects. Include required certifications; and

(c)Apprentice scaler. If apprentice scalers are proposed, provide certif ication of training.

262.03Submittals. At least 30 days before starting slope scaling work , submit the following according to Subsection 104.06:

(a)Proposed construction sequence and schedule;

(b)Describe the method of rope work used and training for rope supported laborers and scaling foreperson (such as Professional Climbing Instructors Association (PCIA), Society of Professional Rope Access Technicians (SPRAT), or equivalent internal training ce rtification program);

(c)Identify and provide contact information for the municipal emergency responders that will perform rescue. Include mapped travel routes for rescue team, rendezvous sites and estimated response time;

(d)Examples of worksheets for evaluatin g slope safety before rope entry (such as a Slope Access Safety Evaluation or Slope Scaling Assessment);

(e)The types of equipment and tools to be used;

(f)The number of slope scalers for the project;

(g)Removal and disposal plan for existing ditch debris (if present) and rock and debris generated from the slope scaling and vegetation removal work, and;

(h)Rockfall protection plan including provisions to protect the roadway and traffic according to Section 156, and facilities and exis ting utilities according to Subsection 107.02(d) .

262.04General. Before starting scaling work, provide temporary roadway protection and public safety measures according to the approved Rockfall Protection Plan. Conduct a pre -slope scaling preparatory phase meeting at least 7 days before the start of slope scaling operations according to Subsection 153.06(a) to evaluate approaches to the slope and site geology conditions and constraints. The CO will r equire that the Contractor remove any slope scaler working or directing others to work in an incompetent, careless, or unsafe manner in according to FAR Clause 52.236- 5 Materials and Workmanship. Perform general scaling within the limits shown in the plans and as directed. If applicable, specific unstable blocks to be removed and areas requiring greater scaling efforts are identified in the plans as intensive scaling areas. Intensive scaling areas are portions of the slope that may need additional time or s pecific equipment to address. Perform vegetation removal from slope brows and rock slope faces, including the removal of trees, shrubs, and other vegetation. Perform slope scaling and tree and vegetation removal before other slope stabilization work or per manent rockfall mitigation work. Dispose of scaled debris and vegetation according to Subsection 203.07.

262.05Equipment. Perform slope scaling using rope supported laborers with hand tools. Include scaling bars, portable hydraulic wedges, and air bag jacks. Provide air bag jacks or hydraulic wedges with a lift capacity of at least 15 tons. Provide rope supported laborers in compliance with Subsection 262.02.

262.06Safety Scaling. Provide safety scaling beyond scaling and tree removal limits as needed to safely perform the prescribed work. 262.07 Slope Scaling Operations. Comply with the following:

(a)Perform slope scaling only when the scaling foreperson is present. Perform slope scaling only when the scaling foreperson has continuous visual contact with all scalers on the slope. Additional scaling fore persons may be required. The scaling foreperson ma y not be actively scaling with the on- slope scalers but can access the site as necessary to supervise scaling operations.

(b)Assign two journeyman s calers for each individual a pprentice scaler. Allow apprentice s calers to work only when under the direct supervision of two journeyman s calers.

(c)Adjust operations to allow emergency traffic through the work site according to Section 156.

(d)Cut the identified trees and other vegetation as shown in the plans. Cut trees and large woody shrubs as close as possible to the ground surface while leaving the root wad intact. Remove vegetation before starting slope scaling operations. (e) Establish anchors for rope access within the construction limits unless otherwise approved.

(f)Perform slope scalin g working in a top to bottom sequence. As the work progresses remove loose rocks, detached rocks, and rocks.

(g)Remove scaling debris from the slope. The CO will review the scaled area to determine when the rock slope scaling and vegetation removal has been completed based on the site geology. If additional vegetation or loose or unstable rocks are identified for removal, continue to scale the slope until the scaling has been completed to the satisfaction of the CO.

(h)If the roadway will be open to traffic, do not leave accumulated scaling debris on the roadway, in the roadside ditch, or in pullouts adjacent to the roadway overnight or at the end of a work shift.

262.08Acceptance. Slope scaling will be evaluated under Subsection 106.02.

Measurement

262.09Measure the Section 262 pay items listed in the bid schedule according to Subsection 109.02 and the following as applicable: Slope scaling will be measured by the scaler hour of production time of each scaler for all slopes. Hour measurements for each journeyman scaler or apprentice scaler starts when each scaler is equipped and starts to actively scale the slope and ends when e ach scaler has descended to the bottom of the rock slope at the end of the work shift. Do not measure hours for safety scaling. Do not measure hours for the scaling foreperson. Do not measure disposal of scaled debris and vegetation.

Payment

262.10The a ccepted quantities will be paid at the contract price per unit of measurement for the pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05 .