140R3025R0014_Attachment_2_-_Task_Order_1_SOW.pdf

Task Order 1

Hoover Dam Rockfall Risk Mitigation – IDIQ Task Order No.1

Hoover Dam, Nevada/Arizona

1. Description of the Work:

a. The work is located at the Hoover Dam Visitor Center and Powerplant, located approximately 7 miles, via Highway 93, northeast of Boulder City, Nevada, in Clark

County.

The work involves inspection, reporting, cleaning, and the reduction of rockfall hazards by scaling, and the installation of permanent rockfall mitigation features including rock bolts, wire mesh netting, and cabling rock in place. Most of the rockfall hazards are to be mitigated by scaling or by securing with rock bolts, mesh or cable. Scaling large rock onto project sites will be subject to additional approvals by the Government. All work will require that Government property is adequately protected.

The work involves the reduction of rockfall hazards by strapping, bolting or installing wire mesh netting and rock bolts. All work will require that Government property is adequately protected. The areas to be mitigated are shown on Figures 1 & 2. The terms upstream and downstream refer to the direction of flow of the Colorado River.

The Contractor is encouraged to propose alternative mitigation procedures if warranted.

2. Principal Components of Work: The principal components of the work to be performed under these specifications include the following:

a. Mobilization and Preparatory Work. Immediately upon proper submission of bonds and insurance the contractor shall mobilize to perform the work. Work shall not begin prior to approval of the site-specific Safety and Health Plan and Work Plan.

b. Rock Fall Mitigation – Parking Garage:

(1) The Contractor will mitigate areas 216, 218, 221, 225, 226, 227, 229, 230, 232, 238, 243, 245, 245, 247, 256, 259, 264 by strapping, meshing, and bolting into competent rock

(2) TABLE 1 lists the rock fall mitigation areas, along with which figure(s) they are shown on, a short description of the work and how to mitigate the rock fall hazard

(scaling, rock bolt or mesh).

(3) Ensure protection of any existing facilities by any rockfall work on parking garage structure.

c. Protection of Existing Facilities. This work includes placing the temporary measures required to protect the Government facilities from scaled rock, maintaining the facility protection, assuring no personnel or public enter the restricted work zone during scaling, and removal of the temporary rockfall protection measures in coordination with

Reclamation’s Lower Colorado Dams Office. Proposed methods of temporary protection shall be submitted for review and approval in the work plan submittal.

Approval of the work plan does not relinquish the Contractor from responsibility if

Government property is damaged. Any government property damaged by falling rock or by the Contractor’s equipment or personnel will be restored to the original condition as approved by the Government at the Contractor’s expense.

Cleanup of the temporary rockfall protection measures shall begin no later than 5:00 a.m. such that the public may have full safe access to the facilities immediately. The temporary rockfall protection measures shall be neatly stacked and stored in assigned storage /laydown areas when not in use.

Measurement and Payment: Measurement will be by the lump sum and shall include all labor, equipment and materials required to protect Government property and for the removal and clean-up of all temporary protective measures.

d. Labor. This work includes the rope access, inspection, planning, reporting of findings to the Government and scaling of rock by hand or bar.

The parties agree that a four-man crew will be required for the rope access labor, including safety oversight and control or work performed on rope. All the rope access technicians must meet all requirements set out in the main contract. At all times a level

3 SPRAT or IRATA rope access supervisor will be required to be onsite during work hours.

Measurement and Payment: Measurement will be by the hour for rope access inspection, rockfall mitigation, scaling or cleanup per rope access technician. The

Government will determine the start time and end time of each day's work. The

Government anticipates that a four-man crew will work ten hours each per day or night.

No separate payment is made for supervision, reporting, or assistance to the

Government's representatives on site during cooperative activities (rope access, radio communications, etc.). The rate shall be the rate that was established in the base contract Section B, Schedule, or as negotiated for this Task Order.

e. Permanent Rockfall Mitigation Features (Materials). This work includes the rope access, inspection, planning, reporting of findings and permanent mitigation/rock retaining mechanisms such as bolts, mesh, or cable with anchors. All materials shall meet the requirements in the base contract including appendix A, and B. Ancillary items for rock bolting and mesh are all items required to have finished installed and tensioned rock bolts and finished installed mesh. This is to include but not limited to all anchoring, rope, nuts, and grout required to install mesh and or bolt. These must meet all qualifications in appendix A and B of the base contract.

The Government reserves the right to determine which mitigation measures to use at each location. No geology or geotechnical engineering is required of the contractor;

however, the Contractor's recommendations will be considered.

Measurement and Payment: Measurement will be based on the Materials required to accomplish each of these features. Include all singular costs and pro-rata costs to establish a unit price based on the unit of measurement in the work item schedule below for each sub-task. Payment shall be linear foot of rock bolt grouted in place, square foot of mesh measured in place, linear foot of stainless-steel cable in place, and each for the anchors used to secure the mesh and cable. Payment will be full compensation for support ropes to weave mesh together, resin cartridges or grout, clips, nuts, bolts and plates. No separate payment will be made for rock that is simply moved to a safe location.

f. Traffic Control. The Contractor will have procedures in place to allow for the safe passage of vehicular and pedestrian traffic during rock fall mitigation activities. This includes identifying safety hazards and then furnishing all necessary labor, materials, tools, and equipment including, but not limited, to signs, barricades, traffic drums, cones, flashers, construction fencing, flag persons, variable message boards, flaggers and guards, warning devices, temporary pavement markings, temporary sidewalk, delineators, etc., to maintain vehicular and pedestrian traffic through and adjacent to the project area.

These measures and actions shall be taken to safely maintain the accessibility of public and construction traffic by preventing potential construction hazards. The Contractor shall submit a Traffic Control plan. All materials, work and incidental costs related to Traffic

Control will be paid for at the contract lump sum price.

(1) Provide cones, delineators, concrete safety barriers, barricades, flasher lights, danger signals, signs, and other temporary traffic control devices as required to protect work and public safety.

(2) Provide flaggers and guards as required to prevent accidents and damage or injury to passing traffic order.

(3) Do not begin work along public or private roads until proper traffic control devices for warning, channeling, and protecting motorists are in place in accordance with approved traffic control plan.

(4) Maintain traffic flow and conduct construction operations to minimize obstruction and inconvenience to public traffic.

(5) Remove traffic control devices when no longer needed.

(6) Submit a Traffic Control plan. Any closures shall be approved by the COR.

f. The labor, equipment and materials in the bid schedule are estimated quantities. Actual quantities may vary depending on field inspections.

g. Appendix A and B of the base contract specifies minimum requirements for materials used in permanent mitigation measures under this Task Order. Refer to the Figures and

Tables in this document on more information and details of areas requiring mitigation under this Task Order. Work plans and schedules and cost proposals shall be based on requirements of the base contract, this Task Order, and their appendices.

3. Identification of Mitigation Methods in Detail. The Government will provide an inspector/geologist to verify or identify details of mitigation methods required in each area after considering the recommendations of the contractor's representative. The Government will identify the selection of mitigation method, among those available under this task order, that are to be used at each location such as moving hazardous rock, placing mesh with anchors over the rock, wrapping and bolting cable around the rock or drilling through and grouting bolts into the rock.

a. Limitations in Mitigation Methods and Activities.

(1) There is no intent of removing rock that does not pose a threat to the public, personnel, or the facilities.

(2) Only rock that can be removed by hand or bar will be scaled.

(3) No blasting will be required.

(4) Rock that may pose a future threat or that requires removal beyond the scope of this contract shall be identified and reported with recommendations to the

Government for possible future contract work.

(5) Rock fall mitigation activities that involve rope work shall NOT be performed in the Visitor Center area between 9:00 a.m. and 6:00 p.m. The Contractor may provide temporary lighting to allow scaling during an overnight shift. The

Contractor must be off rope by 9 a.m. The Contractor will have procedures in place to allow for the safe passage of vehicular and pedestrian traffic from 5:00 a.

m. to 9 a.m. and any temporary protective measures or fallen rock that would impede or obstruct access must be removed to allow for safe passage.

b. Other Work Tasks Associated with Mitigation Activities

(1) Control and Safety Communications. This work may require the contractor to utilize two-way radios to allow communication among the rope access crew;

where two-way radio communication is used; the Contractor shall always make compatible radio equipment available for Government use during the contract.

(2) Anchors. The contractor will make provisions to install and maintain suitable anchors for ropes.

c. Measurement and Payment: No separate payment shall be made for these other work tasks associated with mitigation efforts. The material costs of temporary protective materials, anchors, lighting, and communications shall be included in the material costs as part of preparation for the work and preparation of the worksite or as separately identified in this task order's Bid Schedule. The labor cost of emplacing temporary protections shall be included in the cost of the mitigation work with which these protections are associated.

4. Safety and Health. Provide a task order-specific Job Hazard Analysis and site-specific supplements as appropriate to the base contract SSHP, in accordance with Section C.3 of the base contract.

Measurement and Payment: The cost of this element of the work shall be allocated to preparation or to the work labor, as appropriate.

5. Additional Conditions and Requirements.

a. Task Order Work Plan and Schedule. Within 10 days after award of this task order, but no less than 21 workdays prior to mobilization, the Contractor shall submit a complete technical plan and schedule to include Work Plan, Work Schedule, and appropriate drawings and materials documentation affecting the work to be done and any permanent installations planned under this Task Order. Submittal shall be accomplished in accordance with Section C.7, Submittal Requirements, of the base contract.

b. Weekly Meetings. Contractor shall attend either by phone, computer or in person a weekly meeting during the period that work is being performed. The meeting will be used to report work accomplished and pending, coordinate schedules and activities, identify and coordinate any protective measures needed below work areas, and identify and resolve any information or resource needs and address any other issues. As necessary, and coordinate any protective measures needed below work areas, and identify and resolve any information or resource needs and address any other issues. As necessary, updates to work plans and schedules shall be presented and discussed during this meeting.

c. Completion Report. Within 2 weeks of task completion an as-built report shall be submitted documenting through photographs and a written summary the type, extent, and location of each mitigation accomplished.

6. All work under this task order is considered 'Planned Mitigation' as described in Section C.2 of the base contract.

7. The Contractor shall provide a plan to identify protection methods and means to comply with the task requirements of Section C.2.b., above, and Section C.6 of the base contract. This protection and cleaning plan shall be submitted 7 days prior to commencing this work and shall be updated at each weekly or special work coordination and status meeting as necessary for the conditions encountered in performing this work.

8. Submittals shall be accomplished in accordance with Section C.7 of the base contract.

9. Progress payments are authorized under this contract, for portions of the work accomplished during the billing period of each such payment request.

FIGURES:

Figure 1: Parking Garage Mitigation – 5th floor view

Figure 2: Parking Garage Mitigation – Google maps view

TABLES:

Table 1 – Parking Garage Mitigation Details

Figure 1: View of canyon walls around parking structure (5th floor), coordinate with Table 1 to identify areas needing mitigation.

Figure 2: View of canyon walls around parking structure – Google Maps view.

Slopes Surrounding the Parking Structure

Area Description

1 1/4" Dia. Rock Bolts 2" Dia. Rock Bolts Mesh Cable Anchor

Length

(ft) No.

Drilled length

(ft) Length

(ft) No.

Drilled length

(ft)

Dim. (ft) (length x width) Amount

(ft2) Spike Plate

Length

(ft) Each

13 118 11 220 989 58 140 76

Slab approx. 16 by 10 by 3 ft. in size formed by fractured blocks resting on a steeply dipping slide plane.

Mitigation: Secure with approx. 23 by 12 ft.

of mesh anchored into competent rock.

23.0 11.5 264.5 15 15

Large knob approx. 15 by 15 by 5 ft. in size formed by open joints resting on a slide plane that dips out of the slope.

Mitigation: Secure with approx. 23 by 20 ft.

of mesh anchored into competent rock.

20.0 23.0 460.0 25 25

Large block approx. 15 by 15 by 12 ft. in size resting on the same sliding plane as #219;

slope covered with loose gravel.

Mitigation: Secure with 3, 20-foot long rock bolts.

20 3 60

Blocks are secured with 3 cables. Lowest block is approx. 5 by 3 by 2 ft. in size and is no longer secured.

Mitigation: Secure lowest block with cables anchored into competent rock.

20 4

Unsupported and fractured knob approx. 6 by 6 by 3 ft. size jutting out of rock mass.

Mitigation: Secure with approx. 12 by 12 ft.

of mesh anchored into competent rock.

11.5 11.5 132.3 9 9

Block approx. 3 by 3 ft. in size resting on slide plane.

Mitigation: Secure with cables anchored into competent rock.

30 4

Detached block, approx. 4 by 4 by 2 ft. in size, sitting on slide plane that dips out of the slope.

Mitigation: Secure with cables anchored into competent rock.

40 4

Large block, approx. 30 by 20 by 15 ft. in size, supported by shallow ledge on west side; rest of block is overhanging. No obvious release plane at back of block (north side). Small wedge beneath block is bolted and has rods anchored at base but is probably lending little support.

Mitigation: Secure with 8, 20-foot long rock bolts.

20 8 160

Totally detached block approx. 4 by 4 by 3 ft.

in size sitting on edge of ledge.

Mitigation: Secure with cables anchored into competent rock.

30 4

Cables securing boulders are taut on the west side, but are slack on the east side.

Large boulder at top is bolted.

Mitigation: Tighten eastern cables if possible, or secure with cable anchored into competent rock.

20 2

Rock slab approx. 15 by 15 by 3 ft. in size bounded by partially open joints.

Mitigation: Secure with 2, 8-foot long rock bolts.

8 2 16

Thin wedge approx. 6 by 6 by 1 ft. in size bounded by partially open joints; brittle, will break up if bolted.

Mitigation: Secure with approx. 12 by 12 ft.

of mesh anchored into competent rock.

11.5 11.5 132.3 9 9

Tall, wedge-shaped block approx. 10 by 5 by 3 ft. in size bounded by open joints.

Mitigation: Secure with 2, 10-foot long rock bolts.

10 2 20

Rock block approx. 20 by 10 by 3 ft. in size resting on slide plane.

Mitigation: Secure with 3, 10-foot long rock bolts.

10 3 30

Large slab, 12 ft. long and 2-3 ft. thick, partially detached from slope.

Mitigation: Secure with 2, 8-foot long rock bolts.

8 2 16

Rock block is approx. 8 by 4 by 2 ft. in size;

slide plane dips out of slope.

Mitigation: Secure with 1, 6-foot long rock bolt.

6 1 6

Two blocks, approx. 12 by 10 by 4 ft. and 12 by 2.5 ft. in size, bounded by partially open joints on steeply dipping slide plane.

Mitigation: Secure with 3, 10-foot long rock bolts.

10 3 30

Table 1: Descriptions, and items estimated to perform mitigation.