140R6021R0023_Amendment_No__0004_0004.pdf

(x)

140R6021R0023 x x

1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted ; or (c) By separate letter or electronic communication which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGEMENT TO BE

RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR

OFFER. If by virtue of this amendment you desire to change an offer already submitted , such change may be made by letter or electronic communication, provided each letter or electronic communication makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

x

R60

11/18/2021

13. THIS ITEM ONLY APPLIES TO MODIFICATION OF CONTRACTS/ORDERS. IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

12. ACCOUNTING AND APPROPRIATION DATA (If required) is not extended.is extended, Items 8 and 15, and returning

Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended , by one of the following methods: (a) By completing

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

FACILITY CODE CODE

10B. DATED (SEE ITEM 13)

10A. MODIFICATION OF CONTRACT/ORDER NO.

9B. DATED (SEE ITEM 11)

9A. AMENDMENT OF SOLICITATION NO.

CODE

8. NAME AND ADDRESS OF CONTRACTOR (No., street, county, State and ZIP Code)

7. ADMINISTERED BY (If other than Item 6)CODE 6. ISSUED BY

Bureau of Reclamation Missouri Basin Region Regional Office PO Box 36900 Billings MT 59107

PAGE OF PAGES

4. REQUISITION/PURCHASE REQ. NO.3. EFFECTIVE DATE2. AMENDMENT/MODIFICATION NO.

5. PROJECT NO. (If applicable)

1. CONTRACT ID CODE

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

09/01/2021

CHECK ONE A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority) appropriation data, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

E. IMPORTANT: Contractor is not is required to sign this document and return __________________ copies to the issuing office.

ORDER NO. IN ITEM 10A.

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)15A. NAME AND TITLE OF SIGNER (Type or print)

15C. DATE SIGNED 16B. UNITED STATES OF AMERICA 15B. CONTRACTOR/OFFEROR 16C. DATE SIGNED

(Signature of person authorized to sign) (Signature of Contracting Officer)

Gerri Voto-Braun

STANDARD FORM 30 (REV. 11/2016)

Prescribed by GSA FAR (48 CFR) 53.243

Previous edition unusable

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

Yellowtail Dam Spillway Tunnel Concrete Repair, Apron Protection, and Rockfall Protection System, Yellowtail Unit, Lower Bighorn Division, Pick-Sloan Missouri Basin Program, Montana

See attachment for changes incorporated by this amendment.

Except as provided herein, all terms and conditions of the document referenced in Item 9 A or 10A, as heretofore changed, remains unchanged and in full force and effect .

Amendment No. 0004 Solicitation No. 140R6021R0023

Description of Changes:

1. In Part I – The Schedule, remove Section B – Price Schedules in its entirety and substitute therefore the attached Revised Section B.

2. In Part I – The Schedule, in Section C – Description / Specifications, remove Specification 01 35 20 – Safety and Health in its entirety and substitute therefore the attached Revised Specification 01 35 20.

3. In Part I – The Schedule, in Section C – Description / Specifications, remove Specification 32 33 23 – Rockfall Protection System in its entirety and substitute therefore the attached Revised Specification 32 33 23.

For convenience, essential changes on the revised solicitation pages are indicated by a vertical line within the margin, whereby the lines or paragraphs are changed from the previous version.

However, all portions of the revised solicitation pages shall apply whether changes thereon have been indicated or not.

Acknowledgement: See Block 11 on the Standard Form 30 regarding acknowledgement by offerors to this amendment. The Government requires acknowledgment by offerors to this amendment at the place designated for receipt of proposals. (Please see Block 19 on the Standard Form 1442.)

Receipt of Proposals: The hour and date for receipt of proposals remains unchanged from Amendment No. 0003.

Third Party: If you have provided a copy of this solicitation to another company or individual, please forward this amendment accordingly.

Yellowtail Dam Spillway – Tunnel Concrete Repair, Amendment No. 0004 Apron Protection, and Rockfall Protection System Specification No. 60-C0647

Price Schedule Revised B - 1

CONTINUATION OF SECTION B – SUPPLIES OR SERVICES AND PRICES

YELLOWTAIL DAM SPILLWAY

TUNNEL CONCRETE REPAIR, APRON PROTECTION,

AND ROCKFALL PROTECTION SYSTEM

Yellowtail Unit, Lower Bighorn Division

Pick-Sloan Missouri Basin Program Montana

B.1 PRICE SCHEDULES

(a) Offers will be considered for award on the following Price Schedules, but no offer will be considered for award on only a part of the Price Schedules.

(1) Offerors shall complete Price Schedules A and B. Offers for less than the total of Schedules A and B will be considered nonresponsive and will not be evaluated for award.

(2) Offers will be evaluated based on the total of Price Schedules A and B.

(3) The Government will award Price Schedule A or Price Schedules A and B;

depending on available funds.

a. NOTE: If Price Schedule B is awarded, CLIN 15 will be omitted from the total price offered for Price Schedule A.

(b) Offers are subject to the terms and conditions of this solicitation.

(c) Quantities in the Price Schedules are estimated quantities for comparison of offers only.

Except as provided in the contract clause at FAR 52.211-18, Variation in Estimated Quantity, no claim shall be made against the Government for overruns or underruns. The contract clause at FAR 52.211-18, Variation in Estimated Quantity does not apply to lump sum items.

(d) See the contract clause at WBR 1452.232-81, Payment for Mobilization and Preparatory Work, for CLIN 1.

(e) Definitions:

(1) CLIN – Contract Line Item Number

Price Schedule Revised B - 2

PRICE SCHEDULE A

CLIN Section Supplies or Services Quantity and Unit

Unit Price

Amount

1 WBR

1452.232

-81

Mobilization and Preparatory Work

For the lump sum of $

2 02 70 10 Removal and Control of Water

For the lump sum of $

3 03 20 30 Drilling Holes for Anchor Bars and Epoxy Grouting Bars in Place

71 LF $

4 03 30 00 Drainage Channel Concrete 171 CY $

5 03 37 10 Shotcrete for Tunnel Repairs 6 CY $

6 03 81 10 Core Drilling 4-inch Holes in Existing Concrete

5 LF $

7 03 81 10 Saw Cutting Existing Concrete

110 LF $

8 03 81 10 Concrete Removal 6 CY $

9 06 51 30 Grating Support System For the lump sum of $

10 06 51 30 FRP Grating 1,760 SF $

11 31 23 11 Excavation for Structures For the lump sum of $

12 31 23 11 Backfill and Compaction about Structures

For the lump sum of $

15 01 35 20 Temporary Rockfall Protection System

For the lump sum of $

TOTAL FOR PRICE SCHEDULE A: $_________________

Price Schedule Revised B - 3

PRICE SCHEDULE B

CLIN Section Supplies or Services Quantity and Unit

Unit Price

Amount

13 WBR

1452.232

-81

Mobilization and Preparatory Work

For the lump sum of $

14 32 33 23 Rockfall Protection System For the lump sum of $

TOTAL FOR PRICE SCHEDULE B: $_________________

TOTAL EVALUATED PRICE* = PRICE SCHEDULES A + B = $_________________

*Note: The Total Evaluated Price is used for evaluation purposes only. The resultant contract will either be the sum of (Price Schedule A) or (Price Schedules A and B) once the availability of funds is known.

END OF SUPPLIES OR SERVICES AND PRICES

Safety and Health Revised 01 35 20 - 1

SECTION 01 35 20

SAFETY AND HEALTH

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Cost:

1. Include in the prices offered in the Price Schedule for other items of work, except for engineering controls to be used as part of the proposed temporary rockfall protection program (refer to Section 32 33 23 – Rockfall Protection System).

1.02 REFERENCE STANDARDS

A. Bureau of Reclamation (USBR)

1. RSHS Reclamation Safety and Health Standards including revisions posted at https://www.usbr.gov/safety/rshs/index.html

2. FHECP Yellowtail Dam Facility Hazardous Energy Control Program, built from FIST 1-1 which is available at:

www.usbr.gov/power/data/fist_pub.html

B. Occupational Safety and Health Administration (OSHA)

1. 29 CFR Part 1910 Occupational Safety and Health Standards

2. 29 CFR Part 1926 Safety and Health Regulations for Construction

3. Available at: www.osha.gov/.

C. Applicable State Safety and Health Regulations for Construction.

1.03 SUBMITTALS

A. Submit the following in accordance with Section 01 33 00 – Submittals.

B. RSN 01 35 20-1, Safety Program:

1. Written Safety Program in accordance with RSHS Section 3.3 and the Yellowtail Dam Facility Hazardous Energy Control Program (FHECP).

2. Cover aspects of on site and applicable off site operations and activities associated with this contract.

3. Safety Program will not be accepted for review unless it addresses, in order, lettered and numbered per RSHS Appendix B, a narrative for each applicable item in the outline. For items in the outline that do not apply to this contract write “Not applicable to Contract” next to the number/letter.

Safety and Health

Revised 01 35 20 - 2

4. A generic company safety program is not acceptable. Safety Program must be site specific for this contract.

5. No on-site work, including mobilization, will be allowed until the Safety Program has been be submitted and accepted.

C. RSN 01 35 20-2, Job Hazard Analysis List:

1. Provide a list of JHA’s that shall be submitted throughout the project.

D. RSN 01 35 20-3, Monthly Accident Summary Report:

1. In accordance with RSHS.

1.04 TRAINING DOCUMENTATION AND RECORDS

A. Contractor shall provide all training as required by federal, state, and local regulations in advance of any work activity that requires it. Training needs for site specific hazards shall be identified in the Written Safety Program.

1. Training records, certifications and medical evaluations shall be maintained on-site and made available to On-Site Government Representative upon request.

2. In no case shall an employee perform work until all required training is complete.

B. All training shall be conducted and dated within the last twelve months of this submittal.

PART 2 PRODUCTS

Not Used

PART 3 EXECUTION

3.01 SAFETY PROGRAM

A. In addition to the requirements of RSHS Appendix B, the Written Safety Program shall include, but not be limited to, the following program elements related to completion of work required under these specifications:

1. Job Hazard Analysis (JHA):

a. List of proposed JHA’s in the Safety Program for each anticipated work task.

b. Detailed JHA’s shall be completed on-site prior to starting each work task.

Work will not begin on the phase of the work until a JHA is acceptable to the Onsite Government Representative.

c. Activities involving hazardous materials shall have the appropriate Safety Data Sheet(s) attached to the JHA.

Revised 01 35 20 - 3

d. For each operation requiring the use of heavy equipment, in addition to the use of backup alarms and high visibility vests, include in the JHA, specific steps to ensure the protection of onsite personnel (internal traffic control) from the hazards of being struck by or caught between moving equipment while working around such equipment. Provide all appropriate safety barricades, signs, and warnings.

2. Emergency Action Plan:

a. Detail coordination plan for outside emergency services including response time and a site visit where a rescue requires special capabilities or equipment.

b. This plan shall address detailed emergency contacts and procedures to be used during an on-site emergency.

3. Electrical Safety:

a. Include safe work procedures at the site, electrically qualified persons, grounding techniques, use of mobile generators, construction lighting, power tool safety, and use of personal protective equipment.

4. Respiratory Protection:

a. Identify respirator users, tasks and operations with recognized respiratory hazards.

b. The plan shall address exposure to respirable silica associated with concrete work.

5. Hearing Conservation:

a. Include a task and site-specific hearing conservation plan.

6. Crane, Hoisting and Rigging Safety:

a. Include operator and rigging safety, materials handling, signaling and communication procedures.

b. All operators shall be qualified through formal training, testing, and demonstrated proficiency. Riggers and Signalpersons shall be qualified in accordance with OSHA 1926 Subpart CC.

c. Compliance and record of verified load testing for cranes in accordance with RSHS Appendix F prior to use of cranes.

7. Personal Protective Equipment, (PPE):

a. Include a detailed plan for each task that specifies which personal protective equipment shall be used for all construction activities.

b. The employer shall ensure that the PPE is verified by the manufacturer for the intended use and protection.

8. Hazard Communication:

a. Include a written Hazard Communication Plan.

Revised 01 35 20 - 4

b. The safety and health practices, procedures, and protective equipment used for new and existing products shall be based upon the health hazards identified in the SDS.

9. Lockout/Tagout Procedures:

a. Include the Contractor’s written HECP.

b. The Contractor shall comply with FHECP and OSHA’s 29 CFR 1910.147 for the control of hazardous energy (lockout/tagout), whichever is more stringent.

c. The Contractor shall not be allowed to place locks on Reclamation equipment. The Contractor shall be required to utilize a group lockout procedure when working under the protection of Reclamation equipment.

Include the Contractor’s group lockout procedures for coordination with the facility and its equipment.

d. The group lockout shall utilize a procedure which affords the employees a level of protection equivalent to that provided by the implementation of a personal lockout device on equipment. Tags and master lists shall not be used in place of locks

e. Employee locks on group lockout device shall be required to have the employees name for immediate identification. Locks shall be removed at the end of each shift. Employee locks are to be removed by the employee when the employee is not working in the protected area. Comply with facility HECP procedures and coordinate activities with Reclamation staff.

10. Working Surfaces:

a. Access:

1) Fall Protection and Prevention:

a) Detail safe work procedures, training, and engineering controls for work in elevated areas where employees are exposed to a fall.

b) Use engineered fall protection systems, fall restraint, and/or fall arrest systems for work in elevated areas. Warning line and safety monitoring systems or any combination thereof are not permitted.

2) Rope Supported Work:

a) Include a plan for rope-supported work activities.

b) Climbing team shall consist of at least 3 qualified workers.

3) Ladders:

a) See RSHS for specific requirements.

b) Extension ladders shall rise 42 inches above landing surface.

Revised 01 35 20 - 5

4) Platforms, stairways, and ramps.

5) Uneven or Non-Uniform Surfaces.

b. Scaffolding Safety and Design:

1) Include a scaffolding plan indicating what type of scaffolding will be used at the site and provide drawings, design specifications, manufacturer information, fall protection procedures and falling object protection.

2) Prepared or reviewed and signed by a qualified Professional Engineer (P.E.) except when manufactured systems and standard designs are used.

3) BOR requires fall protection at 6 feet on unguarded scaffolding.

c. Safety Nets.

11. Rockfall Protection:

a. Detail measures and methods to be used for work within the following areas where employees may be exposed to rockfall:

1) Along the south and west sides of the stilling basin (refer to Section 06 51 30 – FRP Grating System).

2) Within the stilling basin, including tunnel ingress/egress (refer to Section 01 14 12 – Workflow Restrictions).

b. At a minimum, include the following:

1) Engineering controls (e.g. scaffolding, netting, etc.).

a) NOTE: These will apply only if Schedule B is NOT awarded. Otherwise, the permanent Rockfall Protection System shall suffice.

2) Administrative controls (e.g. safe work procedures, training, weather restrictions, communication procedures, etc.).

3) Personal Protective Equipment.

3.02 SAFETY AND HEALTH COMPLIANCE

A. Contractor shall comply with RSHS, FHECP, OSHA, local safety programs, and any other referenced safety and health standards. Work shall be performed in accordance with the specific safety program elements and referenced standards.

1. Upon award, one hard copy of RSHS and one hard copy of the FHECP will be provided at no charge for use in connection with the specifications.

2. Construction Safety and Health Standards promulgated by the Secretary of Labor may be obtained from any regional or area office of the Occupational Safety and Health Administration of the U.S. Department of Labor.

Revised 01 35 20 - 6

B. The Contractor shall be responsible for ensuring that Subcontractors comply with the requirements set forth in this specification, written programs, the regulatory standards and the industry standards incorporated by reference in the RSHS, FHECP, and OSHA standards.

C. Provide and maintain a work environment and procedures that:

1. Safeguard the public and Government's personnel, and Contractor employees exposed to Contractor operations and activities.

2. Avoid interruptions of site operations and delays in project completion dates.

3. Control costs in contract performance.

D. Minimum work crew shall consist of no less than two (2) people.

E. Correct any and all safety and health violations identified.

F. When the Contractor fails or refuses to correct a compliance directive, the CO may issue an order to stop all or part of the work.

1. When satisfactory corrective action is taken, an order to resume work will be issued.

2. The Contractor shall not be entitled to extension of time or to claim for damage or to additional compensation by reason of either the directive or stop order.

3. Failure of the CO to order discontinuance of the Contractor’s operations shall not relieve the Contractor of the responsibility for the safety of personnel and property.

G. Maintain accurate record of and report to the CO the following occurrences during performance of this contract:

1. Death.

2. Occupational disease.

3. Traumatic injury to employees or the public.

4. Property damage in excess of $2,500.

H. The rights and remedies of the Government provided in this section are in addition to any other rights and remedies provided by law or under this contract.

1. In the event there is a conflict between requirements contained in RSHS, FHECP, specification paragraphs, Contractor’s approved Safety Program, referenced safety and health codes, and standards, or the U.S. Department of Labor Construction Safety and Health Standards, promulgated under Section 107 of the Contract Work Hours and Safety Standards Act (40 U.S.C. 327 et seq.), as amended, the more stringent requirement shall prevail.

I. Provide appropriate safety barricades, signs, and warnings.

Revised 01 35 20 - 7

J. The Contractor shall be responsible for providing medical and emergency assistance in a timely manner consistent with recognized emergency protocols.

1. In instances where local emergency responders are not readily available, the responsibility to provide emergency services shall default back to the Contractor.

3.03 MEETINGS

A. Contractor Safety Program Review

1. Following acceptance of the Safety Program and before mobilization the Contractors principal on-site representative, general superintendent, and safety professional shall meet with the Government to review the Program in detail.

a. Include subcontractor management representatives as necessary.

B. Joint Safety Policy Meeting

1. The Contractor's principal onsite representative, the COR and designated members of respective staffs shall participate in scheduled monthly joint policy safety meetings. These meetings shall review the effectiveness of the contractor's safety effort, resolve health and safety problems relating to current operations, and provide a forum for planning safe future activities.

a. Contractor and Government shall jointly develop a standing agenda for the meeting.

b. The Contractor shall prepare and maintain meeting minutes.

END OF SECTION

Rockfall Protection System Revised 32 33 23 - 1

SECTION 32 33 23

ROCKFALL PROTECTION SYSTEM

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Rockfall Protection System:

1. Payment: Lump-sum price offered in Price Schedule B.

2. This price shall include, but shall not be limited to the following:

a. Costs for materials, equipment, labor and incidentals required to collect data, design, furnish, and install a complete rockfall protection system above the Yellowtail Spillway Outlet Stilling Basin, as defined in this Section.

b. Costs to clean the cliff face of vegetation, trees, loose rock, debris, etc. as required to install the system.

c. Costs to comply with applicable submittals, safety and health requirements, and quality procedures.

B. Temporary Rockfall Protection System:

1. Payment: Lump-sum price offered in Price Schedule A.

2. This price shall include, but shall not be limited to the following:

a. Costs for materials, equipment, labor and incidentals required to design, furnish, and install temporary engineering controls to be used for rockfall protection.

b. Refer to Section 01 35 20 – Safety and Health for applicable work areas.

3. NOTE: This price will apply only if Schedule B is NOT awarded.

1.02 SCOPE OF WORK

A. Collect data, design, furnish, and install a complete rockfall protection system above the Yellowtail Spillway at the approximate location and according to the general details shown in Section 52 00 00 – Drawings.

1. The system shall be a passive, low-maintenance, self-cleaning attenuator system, capable of capturing rockfall, absorbing and dissipating its kinetic energy, redirecting its descent between a draped net and the rock face, and depositing it into a catch zone between the base of the cliff and the spillway parapet wall.

2. The contract drawings are intended to show conceptual location and details only.

The Contractor is responsible for designing and optimizing the components and location of the system based on design data collected.

Rockfall Protection System

Revised 32 33 23 - 2

1.03 SUBMITTALS

A. Submit the following in accordance with Section 01 33 00 – Submittals.

B. RSN 32 33 23-1, Resumes:

1. Rockfall protection system designer(s).

2. Installation supervisor(s).

3. Crane operator(s).

4. Rope access supervisor(s) and worker(s).

C. RSN 32 33 23-2, Design Documents:

1. Design documents shall include (but not be limited to) the following:

a. Design calculations for all member sizes and their connections based on controlling support reactions and member forces.

b. Shop drawings and specifications of the complete system, showing layout, exact anchor locations and sizes, materials, components, connections, and details.

c. Shipping, storage, and handling instructions.

d. Installation instructions and requirements.

e. Quality control requirements.

2. Certification that the designed system meets the requirements set by these specifications.

3. Test results confirming similarly designed systems have met minimum requirements set by these specifications.

D. RSN 32 33 23-3, Construction Plan:

1. Equipment and procedures to be used for scaling and removal of trees, vegetation, etc.

2. Equipment and materials to be used during construction.

a. Include details on vehicles and crane to be used, demonstrating compliance with the load rating and size restrictions of the powerplant bulkhead gate deck.

1.04 QUALIFICATIONS

A. Design shall be completed by a licensed professional engineer with at least 2 years of experience in designing similar rockfall protection systems.

B. Installation supervisor(s) shall have at least 2 years of experience with installation of similar rockfall protection systems.

Revised 32 33 23 - 3

C. Crane operators shall be qualified in accordance with OSHA 1926 Subpart CC, and certified by an accredited crane operator testing organization (refer to Section 01 35 20 – Safety and Health).

D. Rope access workers shall be properly trained for the work herein, and shall be under the direct supervision of a certified rope access supervisor as defined by Chapter 16 of

RSHS.

1.05 PROJECT CONDITIONS

A. Geology and Topography:

1. The geology in the project area consists of limestone bedrock and breccia (refer to Section 53 20 00 – Records of Geologic and Subsurface Investigations), covered by sparse soils, debris, small trees, and vegetation.

2. The cross-slope of the canyon between the spillway inlet service road and the spillway stilling basin is predominantly 1:1, with a 100-foot cliff near the summit and a 60-foot cliff at the base (see Drawing No. 459-600-60016 in Section 52 00 00 - Drawings).

3. The 60-foot cliff at the base was carved out of the bedrock during the original construction of the dam to provide space for the stilling basin. The proposed alignment of the rockfall protection system posts runs just above the crest of this cliff (see Drawing No. 459-600-60017 and Drawing No. 459-600-60018 in Section 52 00 00 – Drawings).

B. Safety Measures:

1. Refer to Section 01 35 20 – Safety and Health.

2. Preparation for and installation of the rockfall protection system shall not coincide with the construction of other items of work under this Contract (refer to Section 01 14 12 – Workflow Restrictions).

3. All personnel involved with the preparation for and installation of the rockfall protection system shall have the authority to stop work and correct unsafe acts and conditions as they arise.

C. The use of a crane is permitted for installation, although vehicular and crane access to the jobsite is limited (refer to Section 01 55 00 – Vehicular Access and Parking).

PART 2 PRODUCTS

2.01 GENERAL

A. Products shall be in accordance with the approved design.

B. All components shall be resistant to corrosion, UV degradation, and thermal deterioration.

Revised 32 33 23 - 4

C. To the extent possible, the products used shall contain standard modular components that can be easily replaced or repaired when required.

2.02 ROCKFALL PROTECTION SYSTEM

A. Geobrugg® ATT-Series Attenuator System (https://www.geobrugg.com/en/Rockfall- ATTENUATOR-104911,7859.html) or equal, having the following essential characteristics:

1. The system shall be a passive, low-maintenance, self-cleaning attenuator system, capable of capturing rockfall with the following characteristics (refer to Section 51 32 00 – Rockfall Analysis for further details):

a. Origin: Canyon slope between the spillway inlet service road and the stilling basin (see Drawing No. 459-600-60016 in Section 52 00 00 – Drawings).

b. Size: Up to 3 feet in diameter.

c. Shape: Subangular to angular (see Section 51 50 00 – Photographs).

d. Bounce height (measured vertically): Up to 13.5 feet.

e. Velocity: Up to 73 feet per second.

2. The system shall be designed to absorb and dissipate rockfall kinetic energy, redirect its descent between a draped net and the rock face, and deposit it into a catch zone at the base.

3. The system shall consist of the following:

a. Steel posts mounted to anchors on the rock face with pinned connections, supported at the upper ends by upslope and lateral wire ropes, also anchored to the rock face.

b. Another wire rope spanning between the posts, attached with pulleys at the upper ends to allow for lateral movement, and anchored to the rock face at each end.

c. A steel wire mesh drape attached to the wire rope along the top edge, and draped over the downward slope to provide direct contact with the rock face without further anchoring equipment.

4. Refer to Drawing No. 459-600-60018 in Section 52 00 00 – Drawings for estimated number of posts, barrier length, and netting area required.

B. Wire rope attachment points shall be added to the base of the mesh drapery within reach of operating personnel such that the drape may be periodically pulled away from the rock face in order to dislodge trapped rockfall.

C. The system shall be designed by a qualified rockfall protection system designer with experience on similar projects.

Revised 32 33 23 - 5

D. The system shall be successfully tested for dissipation of the energy anticipated from the rockfall described herein. Records of testing shall be submitted with design documents.

PART 3 EXECUTION

3.01 GENERAL

A. Design, furnish, and install a rockfall protection system as specified herein.

3.02 PREPARATION

A. Clean the following surfaces of vegetation, trees, loose rock, debris, etc. in accordance with the approved work plans:

1. Within 5 feet of proposed barrier alignment.

2. Below worker anchor points and within rope areas.

B. Remove and dispose of all fallen materials in accordance with Section 01 74 00 – Cleaning and Waste Management.

3.03 INSTALLATION

A. Install rockfall protection system in accordance with the approved design documents and work plans, as well as the manufacturer’s guidelines and recommendations for installation.

B. Use of a crane is permitted.

C. Temporarily protect the stilling basin and bulkhead deck as necessary to prevent damage to existing structures from falling objects larger than normal rockfall, as defined in Subparagraph 2.02A.1.b of this section (refer to Section 01 56 10 – Protection of Existing Installations).

3.04 CLEAN-UP

A. Remove and dispose of all fallen materials in accordance with Section 01 74 00 – Cleaning and Waste Management.

END OF SECTION