Amendment No. 0002.pdf

(x)

R17PS00792

x x copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted ; or (c) By separate letter or telegram 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 telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

x

Billings MT 59107

R60

PO Box 36900 Regional Office Great Plains Region Bureau of Reclamation

09/12/20170002

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

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

07/02/2017

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 date, 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.

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

Bull Lake Dam Spillway Modifications, Riverton Unit, Pick-Sloan Missouri Basin Program, Wyoming

See attachment for changes incorporated by this amendment:

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. 10-83)

Prescribed by GSA

FAR (48 CFR) 53.243

NSN 7540-01-152-8070

Previous edition unusable

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 .

R17PS00792

Amendment No. 0002

Description of Changes:

1. In Part I – The Schedule, Section 02 83 33 – Removal and Disposal of Materials Containing Heavy Metals, remove pages 02 83 33-5 through 02 83 33-8 and substitute therefor the attached revised pages 02 83 33-5 through 02 83 33-8.

2. In Part I – The Schedule, Section 02 89 30 – Removal and Disposal of Equipment Coated With

Coal Tar Products, remove pages 02 89 30-7 through 02 89 30-10 and substitute therefor the attached revised pages 02 89 30-7 through 02 89 30-10.

3. In Part I – The Schedule, Section 31 03 33 – Removal and Control of Water, remove pages

31 03 33-5 through 03 33-12 and substitute therefor the attached revised pages 31 03 33-5 through 31 03 33-12.

4. In Part I – The Schedule, remove Section 31 24 16 – Zone 5, Rockfill in its entirety and substitute therefore the attached revised Section 31 24 16.

5. In Part I – The Schedule, remove Section 31 37 10 – Riprap in its entirety and substitute therefore the attached revised Section 31 37 10.

6. In Part I – The Schedule, Section 31 51 13 – Soil Nail Walls, remove page 31 51 13-3 and 31 51

13-4 and substitute therefor the attached revised page 31 51 13-3 and 31 51 13-4.

7. In Part I – The Schedule, remove Section 31 56 20 – Secant Pile Cutoff Wall in its entirety and substitute therefor the attached revised Section 31 56 20.

8. In Part I – The Schedule, remove Section 34 71 15 – Precast Concrete Vehicle Barriers in its entirety and substitute therefor the attached revised Section 34 71 15.

9. In Part I – The Schedule, Section 52 00 00 – Drawings, remove the following drawings, and substitute therefor the attached, same numbered drawings:

Sheet No. Drawing No.

12 1236-D-25, Revised 08/16/17 38 1236-D-54, Revised 08/08/17 39 1236-D-55, Revised 08/08/17 78 1236-D-103, Revised 08/10/17 80 1236-D-105, Revised 08/10/17 81 1236-D-106, Revised 08/10/17 82 1236-D-112, Revised 08/10/17

10. In Part I – The Schedule, remove Section F – Deliveries or Performance in its entirety and substitute therefor the attached revised Section F.

11. In Part II – Contract Clauses, Section I – Contract Clauses, remove page I-3 and I-4 and substitute therefor the attached revised page I-3 and I-4.

12. In Part II – Contract Clauses, Section I – Contract Clauses, remove pages I-29 through I-32 and substitute therefor the attached revised pages I-29 through I-32.

13. In Part II – Contract Clauses, Section I – Contract Clauses, remove page I-41 and I-42 and substitute therefor the attached revised page I-41 and I-42.

14. In Part IV – Representations, Certifications and Instructions, remove Section K –

Representations, Certifications and Other Statements of Offerors and substitute therefor the attached revised Section K.

15. In Part IV – Representations, Certifications and Instructions, Section L – Instructions, Conditions and Notices to Offerors, remove page L-15 and L-16 and substitute therefor the attached revised page L-15 and L-16.

16. In Part IV – Representations, Certifications and Instructions, Section M – Evaluation Factors for

Award, remove pages M-3 through M-6 and substitute therefor the attached revised pages M-3 through M-6.

For convenience, essential changes on the revised solicitation pages are indicated by a vertical line in the margin where lines or paragraphs changed from the previous version. However, all portions of the revised solicitation pages shall apply whether changes thereon have or have not been indicated.

Acknowledgement: See Block 11 above regarding how to acknowledge this amendment. The Government must receive the acknowledgement at the place designated for receipt of bids (See Block 10 of the Standard Form 1442).

Receipt of Proposals: The hour and date for receipt of proposals has been extended to 2:00 PM (MST) October 20, 2017.

Third Party: If you have given a copy of the solicitation to someone else, please forward this amendment accordingly.

A list of contractor questions and their respective answers are attached for information only.

Additional contractor questions/answers will be addressed in future amendments:

Organized Site Visit – the following is a list of individuals in attendance at the organized site visit:

Dallas Moulton Whitaker Const. dallas@whitcon.com Brandon Blanchard Whitaker Const. brandon@whitcon.com Mike Linden Fluid Pro mlinden@fluid-pro.net Matt McDowell RSCI mattm@rscigroup.com Chris Danlvey C&C cc.rentals@hotmail.com Matt Ekstrom Penhall Company mekstrom@penhall.com Chris Audiss Oftedal Construction caudiss@oftedalconstruction.com Randy Stelzner Inberg Miller rstelzner@inberg-miller.com Tom Axthelm Inberg Miller taxthelm@inberg-miller.com Dennis Diterman GBI dennisd@goodfellowbros.com

Mike McFarlund Goodfellow Bros, Inc. mikem@goodfellowbros.com Dean Johnson Johnson-Wilson, Inc. dean@johnson-wilson.com Casey Patterson Johnson-Wilson, Inc. casey@johnson-wilson.com Shawn Terris Tighee Timberframe tigheetimberframe@yahoo.com Josh Reynolds Barcon josh.reynolds@barnard-inc.com Brian Krohmer Barcon brian.krohmer@barnard-inc.com Patrick Stump Barcon Patrick.stump@barnard-inc.com Brett Walchur Barcon brett.walchur@barnared-inc.com Marcus Johnson Barcon marcus.johnson@barnard-inc.com Chris Eckhardt Barcon chris.eckhardt@barnard-inc.com Sam Larson Barcpm sam.larson@barnard-inc.com Greg Bradshaw Riverton Ready Mix rrm@wyoming.com Tom Saele SEMA Construction tasele@semaconstruction.com Gary Boring Oftedal Construction gboring00@gmail.com Harold Hutson BRS hhutson@brsengineering.com Iuan Bugh Shot Crete Const. shotcrete1996@gmail.com Terry Zenk Apex Surveying Inc. tzenk@apexsurveying.com Jonathon Farrer Granite Const Jonathon.farrer@gncinc.com Chad Connell High Country Const. chadc@highcountryconst.com Carter Masterson Malcom Intl. cmasterson@malcomintl.com Barry Fitzgerald Malcom Intl. barryfitz@hotmail.com Patrick Snyder Malcom Intl. psnyder@malcolmintl.com Allen Stanton Schnabel Foundation stantona@schnubel.com David Gerber Gerber Construction dg@zgerber.com Dennis Ashton Granite Construction dennis.ashton@gcing.com John Joslin DBM Contractors john.joslin@dbmcontractors.com Jeff Neal Malcolm Drilling jneal@malcolmdrilling.com Matt Kennedy Malcolm Drilling mkennedy@malcolmdrilling.com Mark Peloquin Strata Inc. mpeloquin@stratageotech.com Brandon Larson Park Const. blarson@parkconstructionco.com Neil ValAmburg NW Construction neil.vanamburg@nwconstruction.us Neil Warden NW| Construction neil.warden@nwconstruction.us Sam Redmond NW Construction sam.redmond@nwconstruction.us Jessie Long Phillips & Jordan jlong@pandj.com Frank Jones Granite frank.jones@gcinc.com Richard Verphal MK Weeden rvorphal@mkweeden.com Monte Weeden MK Weeden mkw@mkweeden.com Mike Kinderski MK Weeden mikek@mkweeden.com Tyler Miller Earth Work Solutions tyler.miller@earthwork.us.com Randy Berg Hamilton Const. rburge@hamil.com Rich King ASI Construction rking@asidams.com Thomas Eagens Heeter Const. theagens@gmail.com Nathan Anderson Griffin Dewatering Nathan.anderson@griffindewatering.com Brandon Reed William H. Smith breed@whsmithpc.com Michael Barnett Granite Const. Michael.barnett@gcinc.com Dave Fehringer William H. Smith dfehringer@whsmith.com Taylor Miller Anderson Drilling tjmiller@andersondrilling.com

Bull Lake Dam Spillway Modifications Amendment No. 002

Riverton Unit, Wyoming Solicitation No. R17PS00792

Removal and Disposal of Materials Containing Heavy Metals

Revised 02 83 33 - 5

B. In the event that a portion of the waste stream is verified as hazardous waste, the contractor and Reclamation are jointly and severally liable in accordance with 40 CFR

Part 260. The contractor is responsible for the release of any hazardous waste that is directly created or aggravated by the specific negligent actions of the contractor in the performance of this work.

C. The facility owner EPA Identification Number will be provided to the successful bidder after award.

1.09 CONTRACTOR’S RESPONSIBILITIES

A. Removal:

1. Do not allow coatings to become airborne when removing or relocating equipment or miscellaneous metalwork with coatings containing heavy metals.

2. Do not allow debris from equipment removal to fall directly on the ground.

3. Clean up areas where debris from equipment removal occurs on a minimum daily basis.

4. Characterize waste debris generated from the removal of coatings in accordance with 40 CFR 261, to determine if hazardous waste is present.

5. Characterize waste debris generated from the removal of equipment in accordance with 40 CFR 261, to determine if hazardous waste is present.

B. Recycle or Disposal of equipment with coatings containing heavy metals.

1. Recycle equipment with coatings containing heavy metals whenever possible.

a. Verify recycling facility acceptance of equipment.

b. Obtain certification of equipment acceptance from recycling facility.

2. Dispose of equipment with coatings containing heavy metals if recycling is not possible.

a. Conduct a hazardous waste determination by collecting a representative sample of the equipment with coatings containing heavy metals to be disposed.

b. Dispose of equipment with coatings containing heavy metals either as hazardous waste or solid waste in accordance with applicable Federal, State, and local regulations.

c. Obtain certificate of disposal from disposal facility when hazardous waste or solid waste has been treated.

C. Hazardous Waste

1. Obtain EPA Identification number from Reclamation, in accordance with 40 CFR

262.12 before treating, storing, or transporting hazardous waste (if applicable).

Revised 02 83 33 - 6

2. Prepare manifest, in accordance with 40 CFR 262 Subpart B, before transporting hazardous waste for offsite treatment, storage, or disposal (if applicable).

3. Before transporting hazardous waste, obtain written notice from owner or operator of hazardous waste facility, including documentation that facility has required permits and that facility will accept waste to be shipped under this contract, in accordance with 40 CFR 264.12 (if applicable).

4. Obtain required transportation permits.

PART 2 PRODUCTS

Not Used

PART 3 EXECUTION

3.01 CONTAINMENT SYSTEM

A. Design and construct containment system to control emissions to the environment in conformance with Federal, State, and local regulations and the following criteria:

1. Contain all releases during coating removal and equipment removal, relocation, modification, and installation.

2. Do not exceed ambient air quality standards.

3. Prevent contamination of any reservoir, watercourse, or water system.

4. Prevent contamination of sediment in any reservoir or watercourse.

5. Prevent contamination of soil.

B. Provide signs and barriers at each point of entry to containment area to prevent unauthorized personnel access.

3.02 WASTE CHARACTERIZATION, HANDLING, AND DISPOSAL

A. Characterize waste debris during removal or modification of equipment in accordance with 40 CFR 261 to determine if hazardous waste is present.

B. RCRA defined Hazardous Waste:

1. Comply with 40 CFR 262 and 40 CFR 268.

2. Do not co-mix different types of hazardous and non-hazardous waste materials.

3. Store coating debris in EPA approved weatherproof and watertight steel containers.

4. Seal, label, and store in accordance with 49 CFR 178.

5. Dispose of waste at EPA permitted RCRA Subtitle C disposal facility.

Revised 02 83 33 - 7

C. Non-hazardous Waste:

1. Store in closed containers separate from hazardous waste storage areas.

2. Comply with Section 01 74 00 - Cleaning and Waste Management.

D. Transport hazardous waste materials in accordance with 40 CFR 263, 49 CFR 107, and applicable regulations contained in 49 CFR Chapter I.

3.03 REPORTABLE RELEASES

A. Notify applicable agencies and COR.

3.04 CLEARANCE TESTING

A. Non-porous surfaces:

1. Wipe samples: Take wipe samples to collect surface dust at 3 locations in work areas. Follow ASTM E1728 wipe sample collection and analysis criteria.

2. Analyze samples for total lead and other heavy metal content.

3. Acceptance criteria: Not to exceed 500 micrograms per square foot.

B. Porous surfaces:

1. Visual methods: Visually inspect work areas for visible paint chips, abrasives, and dust.

3.05 DECONTAMINATION OF CONTAMINATED AREAS

A. Decontaminate areas and surfaces contaminated with lead and other heavy metals in accordance with regulatory requirements and detailed in the Emission and Release

Monitoring Plan.

END OF SECTION

Revised 02 83 33 - 8

This page intentionally left blank.

Removal and Disposal of Equipment Coated With Coal Tar Products

Revised 02 89 30 - 7

1. Certified by ABIH.

2. Experienced in designing, implementing, directing, and monitoring Emission and Exposure Monitoring Plan.

C. Containment System Designer Qualifications:

1. Registered Professional Engineer.

2. Competent Person experienced in designing abatement and containment systems..

D. Laboratory Qualifications:

1. Proficient in conducting coal tar analysis and accredited under a national accredited organization (EPA, AIHA, etc.).

E. Disposal Facility Qualifications for Hazardous Waste:

1. Approved for hazardous waste disposal as appropriate by the EPA, state, and local regulatory agencies.

1.06 REGULATORY REQUIREMENTS

1. Solid and hazardous waste debris is subject to all applicable Federal, State, and local requirements including State of Wyoming Occupational Health and Safety and Environmental Quality Acts. The most stringent regulation shall apply.

Listing and interpretations of regulations contained in this section do not relieve the Contractor from compliance with regulations.

1.07 SAFETY AND HEALTH REGULATIONS

A. Comply with RSHS.

B. Comply with the Occupational Safety and Health Administration (OSHA) standards found in 29 CFR 1926.

C. Comply with State of Wyoming Department of Employment OSHA Standards.

D. Limit employee exposure to coal tar components and other airborne containments in accordance with ACGIH TLVs.

1.08 PROJECT CONDITIONS

A. Coal tar coatings are strongly believed to be present on radial gates slated for removal and disposal. The Government has not tested these coatings for coal tar products.

B. Other hazardous material may also be present at these locations.

C. The facility owners EPA Identification Number will be provided to the successful bidder after award.

Revised 02 89 30 - 8

1.09 CONTRACTOR RESPONSIBILITIES

A. Obtain EPA Identification number from facility owner before treating, storing, or transporting hazardous waste.

B. Prepare manifest, in accordance with 40 CFR 262 Subpart B, before transporting hazardous waste for offsite treatment, storage, or disposal.

C. Before transporting hazardous waste, obtain written notice from owner or operator of hazardous waste facility, including documentation that facility has required permits and that facility will accept waste to be shipped under this Contract, in accordance with

40 CFR 264.12.

D. Determine proper disposal method for project solid waste or hazardous waste in accordance with EPA and Wyoming regulations.

E. Obtain certificate of disposal from disposal facility when hazardous waste has been treated or disposed.

F. Obtain required transportation permits.

PART 2 PRODUCTS

Not Used

PART 3 EXECUTION

3.01 ABATEMENT AND CONTAINMENT SYSTEM

A. Design and construct abatement and containment systems to control releases and emissions to the environment in conformance with Federal, State, and local regulations and the following criteria:

1. Do not exceed ambient air quality standards.

2. Prevent contamination of any reservoir, watercourse, or water systems.

3. Prevent contamination of sediment in any reservoir or watercourse.

4. Prevent contamination of soil.

B. Design and construct abatement and containment systems for the removal and disposal of equipment coated with coal tar products.

C. Provide signs and barriers at each point of entry to containment area to deter unauthorized personnel access into regulated areas.

Revised 02 89 30 - 9

3.02 WASTE CHARACTERIZATION, HANDLING, AND DISPOSAL

A. Characterize solid waste debris generated from removal operations, in accordance with 40 CFR 261, TCLP Method 1311. Presume waste is hazardous until characterized.

B. Comply with approved written Plan for Waste Characterization, Handling, and Disposal.

C. RCRA-defined Hazardous Waste:

1. Comply with 40 CFR 262 and 40 CFR 268 (RCRA).

2. Comply with 40 CFR 700 - 766 (TSCA).

3. Comply with Wyoming Department of Environmental Quality Solid and Hazardous Waste Division - Hazardous Waste Rules.

4. Do not co-mix different types of hazardous and non-hazardous waste materials.

5. Store coating debris in EPA approved weatherproof and watertight steel containers.

6. Seal, label, and store in accordance with 49 CFR 178.

7. Dispose of waste at EPA permitted RCRA Subtitle C disposal facility.

D. Non-hazardous Waste:

1. Store in closed containers separate from hazardous waste storage areas.

2. Dispose waste in accordance with local, county, state, and federal regulations.

3. Comply with Section 01 74 00 - Cleaning and Waste Management.

E. Transport hazardous waste materials in accordance with 40 CFR 263, 49 CFR 107, and applicable regulations contained in 49 CFR Chapter I.

F. Determine proper method of disposal for solid waste and hazardous waste materials.

3.03 EMISSIONS MONITORING, GENERAL

A. Sampling Protocol: In accordance with EPA, NIOSH, or OSHA sampling criteria.

B. Monitor for Components of Coal Tar Organics:

1. Air monitoring of emissions using high volume area sampling monitors.

2. Wipe sampling of surfaces in regulated areas.

C. Conduct visual inspections for visible emissions, spills, or deposits of contaminated materials (i.e., coating debris, dusts, stripping or blasting abrasives, etc.) into the water or onto the ground, ground cover, asphalt pavement, concrete pavement, soil, or slope protection. Include verification that proper cleanup is undertaken and that the cause(s) of unacceptable releases is corrected prior to resuming work.

Revised 02 89 30 - 10

3.04 AIR QUALITY MONITORING BY AREA AND EMPLOYEE EXPOSURE

PERSONNEL MONITORS

A. Perform employee exposure monitoring to determine exposure to coal tar coating components in accordance with EPA, NIOSH, or OSHA analytical sampling methods.

B. Do not exceed emissions limit standards in the ACGIH TLVs, 29 CFR 1910.1000 and

29 CFR 1926.55.

C. At the same time that employee exposure monitoring is done, monitor airborne contaminants at boundary of regulated area.

D. If emissions exceed specified maximum allowable concentrations, stop work until the containment system is corrected to meet required standards.

3.05 REPORTABLE RELEASES

A. Notify applicable agencies and COR.

3.06 CLEARANCE TESTING

A. Non-porous Surfaces:

1. Take wipe samples to collect surface dust at locations in accordance with approved Emissions Monitoring Plan.

2. Analyze samples for coal tar components.

3. Acceptance Criteria: Not to exceed background levels.

B. Porous Surfaces:

1. Visual Methods:

a. Visible paint chips and dust.

b. Visible abrasives.

3.07 DECONTAMINATION OF CONTAMINATED AREAS

A. Clean and decontaminate areas, surfaces, or soils contaminated with coal tar components or dusts from work activities to restore to background pre-construction levels.

Removal and Control of Water

Revised 31 03 33 - 5

D. Contractor shall control seepage from excavated surfaces and existing toe drains.

E. Design and install facilities to collect discharge water from dewatering and unwatering systems, and existing toe drains, and convey water to designated discharge areas.

F. Provide sequence of dewatering and unwatering system(s) installation, operation, maintenance, and removal.

G. Provide power exclusively for operation of dewatering and unwatering systems on a 24-hour, 7-day week timeframe.

H. Primary power source can be supplied by service power or generators. Refer to Section 01 51 00 – Temporary Utilities. If generators are used, the noise level shall not exceed 70 dB at 75 feet from generators.

I. Provide dedicated backup (standby) power system sufficient to power entire dewatering and unwatering facilities. The backup power system shall be tested upon installation and provide automatic switch over to the backup system in the event of a primary power system failure.

J. Provide required equipment for dewatering system(s), piezometers, unwatering facilities, and monitoring programs.

K. Existing observation wells may be used by the Contractor to monitor water levels.

L. Provide standby equipment including a minimum of two replacement pumps onsite at all times that the dewatering and unwatering systems are operational.

M. Dewater and unwater during construction to meet water control requirements and to maintain the required excavation conditions and allow construction ‘in the dry’ to proceed as intended.

N. Monitor and evaluate effectiveness of dewatering and unwatering systems on a continuous basis while systems are in operation. Make necessary changes to maintain required dewatered/unwatered conditions in open excavations.

O. Select sedimentation tanks or design, construct, and maintain a sedimentation basin or basins to allow sediment to settle out sufficiently as required by state regulations and applicable permit(s) before being discharged to the approved discharge point.

P. The dewatering specialist’s and the dewatering specialist assistant(s)’ only responsibility shall be the installation, operation, maintenance, repair, and monitoring of the dewatering and unwatering systems.

Q. Minimum Required Personnel:

1. Dewatering Specialist:

Revised 31 03 33 - 6

a. On site a minimum of one shift per day during dewatering system installation.

b. On-call 24 hours a day, 7 days a week, and able to reach the site within 8 hours when dewatering systems are in operation.

2. Dewatering Specialist Assistant(s):

a. Specifically trained and under the supervision of the dewatering specialist.

b. On site 24 hours a day, 7 days a week when dewatering systems are in operation.

c. Dewatering specialist can fulfill this requirement.

3. Operation/maintenance person experienced in pump operation and maintenance:

a. On site 24 hours a day, 7 days a week when the dewatering system is in operation.

4. Dewatering specialist and/or dewatering specialist assistant(s) can fulfill requirement.

R. The Contractor shall notify the COR within 8 hours if a pump failure occurs.

S. Remove pumps, equipment and materials associated with the dewatering and unwatering systems from the site at the end of the project, including related power systems.

Removed pumps, equipment and materials shall remain the property of the Contractor.

T. Abandon dewatering system upon completion of the work.

U. Damaged or destroyed dewatering and/or unwatering systems, or any component of those systems, resulting from construction activities and/or human error shall be repaired or replaced by the Contractor at the Contractor’s expense.

1.09 QUALIFICATIONS

A. Dewatering Specialist:

1. Professional Engineer (P.E.), Certified Engineering Geologist (C.E.G.), or Certified Professional Hydrogeologist (P.H.G.).

2. Experience:

a. Minimum of 15 years of recent experience in the design of dewatering systems similar in nature to that required by this contract.

b. Responsible for the design, installation, and operation of a minimum of 5 successfully executed dewatering systems similar in nature to that required by this contract.

3. Education:

a. A minimum of a Bachelor’s degree in the fields of engineering, engineering geology, or hydrogeology.

Revised 31 03 33 - 7

B. Dewatering Specialist Assistants:

1. Competent employees selected by the dewatering specialist.

2. A minimum of 10 years of recent experience in dewatering system installation, operation, maintenance, and removal.

3. Shall communicate directly with dewatering specialist.

C. Dewatering Company:

1. Minimum of 15 years of experience in dewatering design, installation, operation, maintenance, and removal similar in nature to that required by this contract.

2. Project Experience, include as a minimum 5 previous projects:

a. Name of project.

b. Location of project.

c. Description of dewatering system for each project.

d. Duration of dewatering system operation for each project.

PART 2 PRODUCTS

Not Used

PART 3 EXECUTION

3.01 REMOVAL OF WATER

A. Design, furnish, install, maintain, and operate necessary facilities for removal of water from various parts of the work and for maintaining foundations and other parts of the work free from water as required for constructing each part.

B. Accomplish water control and removal by use of approved Contractor-designed systems.

C. The dewatering and unwatering operations shall be carried out in such a manner that no piping of fine soils (finer than No. 200 sieve) develops, nor disturbance to the bearing soils occurs as a result of the operations.

D. Prior to initiating excavation for the new spillway stilling basin, groundwater levels beneath the entire stilling basin excavation footprint shall be at or below elevation 5706.5, as confirmed by piezometers and in accordance with drawings 1236-D-23 and 1236-D-24. Contractor shall maintain groundwater levels at or below elevation 5706.5 to prevent groundwater pressures from exceeding overlying pressures and keep the excavation side slopes free of flowing water until the stilling basin is backfilled to elevation 5750.

Revised 31 03 33 - 8

E. Discharged water shall be transported via pipe or hose to sedimentation tanks or a settling pond or approved discharge location(s). If a settling pond is required, it shall be constructed at a location approved by the COR. Excavated materials shall be stockpiled for use in backfilling the settling pond upon completion of dewatering and unwatering operations.

F. The dewatering and unwatering systems shall be operated continuously to prevent possible “flotation” of partially completed structures, saturation of bedding or foundation materials, or other work.

G. Maintain groundwater levels and associated water pressures below the excavated soil surface during excavation, foundation inspection and acceptance, stilling basin construction, and stilling basin backfill operations. Flowing groundwater from the foundation soils into the excavation shall not be permitted and will be evidence that these pressures have not been controlled.

H. Control flows from existing toe drains such that discharges are not directed toward the stilling basing and discharge channel excavations, or otherwise negatively impact construction.

3.02 UNWATERING

A. Install unwatering sumps as needed. The number of sumps and locations shall be changed to adjust for field conditions and water levels monitored from piezometers, as determined by the COR.

B. Locate all unwatering facilities to maximize water removal and control, and to minimize construction interference.

C. Install temporary ditches and sumps required to collect and control ponded water and runoff in open excavation and on cut or excavated slopes. All ditches or sumps for removal of water excavated below the final lines and grades shown on the drawings shall be backfilled with materials conforming to the gradation and compaction requirements specified for adjacent materials.

D. Operate and maintain the unwatering systems during entire period of unwatering operations, including implementation of the winterization and winter operation plans as and when necessary.

3.03 DEWATERING

A. Accomplish dewatering by use of sufficient number of properly screened eductor wells, or other equivalent methods.

B. Dewater to prevent loss of fines from the foundation, maintain stability of excavated slopes and bottoms of excavations, and to allow construction operations to be performed “in the dry”.

Revised 31 03 33 - 9

C. Monitor groundwater levels to evaluate rates of drawdown and compare with minimum target elevations submitted for dewatering and construction schedule submittals.

3.04 DRILLING REQUIREMENTS FOR DEWATERING

A. Water drilling methods must be accompanied with a casing advancer.

B. All drilling fluids must be circulated to the surface within the casing.

3.05 REPAIR

A. Repair damage to work caused by inadequate performance of facilities, mechanical or electrical failure of equipment, or inadequate monitoring or maintenance of facilities.

Obtain approval of repair or replacement work from COR.

3.06 DISPOSAL OF WATER

A. Dispose of removed water in accordance with Section 01 57 30 – Water Pollution Control.

3.07 OPERATION AND MAINTENANCE OF DEWATERING SYSTEM

A. Maintain continuous operation of the dewatering system including monitoring and maintenance as required, in a manner to achieve and maintain the specified water levels below any excavation, including implementation of the winterization and winter operation plans as and when necessary.

B. Comply with water removal requirements in these specifications during production operation of the dewatering system.

C. Pumps and power units shall remain in operable condition at all times. Take immediate action to repair or replace any pump or power unit with backup equipment. Any pump or power unit that cannot be repaired within 2 hours shall be replaced with a similar standby unit and the standby unit shall be replaced within 1week.

D. Maintenance program shall conform to equipment manufacturer’s recommendations and instructions, and shall include not only production equipment, but standby and spare equipment and materials. Damaged, defective, or deficient equipment shall be repaired or replaced as expeditiously as practicable.

3.08 MONITORING OF DEWATERING SYSTEM

A. Contractor may use existing piezometers for monitoring groundwater levels during primary drawdown period. Existing piezometers shall be abandoned prior to initiating excavation. Refer to the drawings for piezometers to be protected or abandoned.

B. Provide the required equipment to monitor the performance of the dewatering system.

1. By measuring and recording water levels to within plus or minus 0.1-foot.

Revised 31 03 33 - 10

2. By measuring rates of discharge from representative individual wells and the combined system.

C. Evaluate effectiveness of dewatering system at a minimum of weekly, and modify the system as needed. Inform the COR of any changes and reasons for the changes prior to performing the changes.

D. Perform monitoring during entire period of system operation. Visual observations of the excavation surfaces shall be used to monitor performance once the new spillway stilling basin foundation excavation is initiated.

3.09 STANDBY UNWATERING SYSTEM COMPONENTS

A. Uncontrolled surface water in and adjacent to the excavations may cause instability in cut slopes, reduce suitable working conditions in the excavation, and delays in construction activities.

B. Standby unwatering equipment and systems suitable for anticipated site conditions shall be maintained on-site and ready to install on an as needed basis.

3.10 CONTROL OF WATER AFTER CONSTRUCTION

A. After the structures have been completed and backfilled, allow water to rise uniformly around structures in a controlled manner.

3.11 WELL REMOVAL AND ABANDONMENT

A. Following receipt of written directive from the COR to cease dewatering, remove dewatering equipment and abandon all wells.

B. Remove equipment from the site, including standby and spare equipment and temporary electrical sources.

C. Dewatering wells, piezometers, and observation wells shall be abandoned, filled, and sealed in accordance with the following minimum requirements:

1. The wells shall be filled with cement grout tremied through a pipe from the bottom upwards.

2. Any casing remaining in the hole shall be removed or cut off not less than 3 feet below ground surface, and the resulting hole backfilled and compacted with sand material after the well is backfilled with cement grout.

3.12 REMOVING UNWATERING SYSTEMS

A. Following receipt of written directive from the COR to cease unwatering, remove unwatering equipment, and fill sump pits and trenches.

Revised 31 03 33 - 11

B. Fill sump pits and trenches to design excavation grades with compacted gravel materials in accordance with Section 31 24 14 - Zone 3, Gravel Material.

C. Fill settling basin(s), if used, to specified grade in accordance with Section 31 24 10 - Embankment Construction and Section 31 23 02 - Compacting Earth Materials.

D. Remove erosion control and protective features at discharge points and restore discharge points to their original condition.

Revised 31 03 33 - 12

Zone 5, Rockfill

Revised 31 24 16 - 1

SECTION 31 24 16

ZONE 5, ROCKFILL

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Zone 5, Rockfill:

1. Measurement: Volume in place to lines, grades, and dimensions shown on drawings. No allowance will be made for settlement or consolidation.

2. Payment: Unit price offered in the Price Schedule.

a. Includes cost of placing rockfill material.

b. Includes rock spalls and gravel to fill voids in rockfill.

1.02 REFERENCE STANDARDS

A. ASTM International (ASTM)

1. ASTM C88-13 Soundness of Aggregates by Use of Sodium Sulfate or Magnesium Sulfate

2. ASTM C127-12 Density, Relative Density (Specific Gravity), and Absorption of Coarse Aggregate

3. ASTM C131-06 Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine

1.03 SUBMITTALS

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

B. RSN 31 24 16-1, Approval Data and Test Results:

1. Name and location of commercial rock source.

2. Gradation of Zone 5, Rockfill.

3. Certified laboratory test results demonstrating rock meets specified material requirements.

1.04 DELIVERY, STORAGE, AND HANDLING

A. Handle, load, haul, stockpile, and place rockfill to minimize segregation and breakdown.

B. Prevent contamination with soil or vegetative material.

Zone 5, Rockfill

Revised 31 24 16 - 2

C. If rockfill materials are stockpiled on site, clear stockpile area prior to stockpiling.

D. Protect stockpiles to minimize contamination and erosion.

1. Methods to protect stockpiles include:

a. Locate stockpiles out of prevailing winds.

b. Prepare scarified base pad.

c. Keep surface water away from stockpiles and control erosion from surface water by constructing drainage ditches around stockpiles.

d. Cover stockpiles with impermeable sheeting.

PART 2 PRODUCTS

2.01 ROCK

A. Obtain from the following:

1. Approved commercial source.

2. In accordance with Section 31 14 10 – Stripping.

3. On-site material excavated and stockpiled in accordance with Section 31 23 15 – Excavating Existing Riprap and Rockfill.

B. Hard, dense, and durable.

1. Specific gravity, ASTM C127, Minimum: 2.60.

2. Absorption, ASTM C127, Maximum: 2 percent.

3. Loss, Sulfate Soundness, ASTM C88, Maximum: 10 percent.

4. Loss at 100 cycles, Los Angeles Abrasion, ASTM C131, Maximum: 10 percent.

5. Loss at 500 cycles, Los Angeles Abrasion, ASTM C131, Maximum: 40 percent.

C. Shape:

1. Predominantly angular or sub-rounded.

2. Maximum dimension not greater than 3 times minimum dimension.

D. Zone 5, Rockfill Gradation: Reasonably well graded within limits shown in Table 31 24 16A - Zone 5, Rockfill Gradation.

Riprap

Revised 31 37 10 - 1

SECTION 31 37 10

RIPRAP

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Riprap:

1. Measurement: Volume in place to lines, grades, and dimensions shown on drawings.

2. Payment: Include in the unit price offered in the Price Schedule.

a. Includes rock spalls and gravel to fill voids in riprap.

1.02 REFERENCE STANDARDS

A. ASTM International (ASTM)

1. ASTM C88-13 Soundness of Aggregates by Use of Sodium Sulfate or Magnesium Sulfate

2. ASTM C127-12 Density, Relative Density (Specific Gravity), and

Absorption of Coarse Aggregate

3. ASTM C131-06 Resistance to Degradation of Small-Size Coarse

Aggregate by Abrasion and Impact in the Los

Angeles Machine

1.03 SUBMITTALS

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

B. RSN 31 37 10-1, Approval Data and Test Results:

1. Name and location of commercial rock source.

2. Gradation of riprap.

3. Certified laboratory test results demonstrating rock meets specified material requirements.

PART 2 PRODUCTS

2.01 ROCK

A. Obtain from on-site material excavated and stockpiled in accordance with Section 31 23

15 – Excavating Existing Riprap and Rockfill, or approved commercial source.

B. Hard, dense, and durable.

Riprap

Revised 31 37 10 - 2

1. Specific gravity, ASTM C127, Minimum: 2.60.

2. Absorption, ASTM C127, Maximum: 2 percent.

3. Loss, Sulfate Soundness, ASTM C88, Maximum: 10 percent.

4. Loss at 100 cycles, Los Angeles Abrasion, ASTM C131, Maximum: 10 percent.

5. Loss at 500 cycles, Los Angeles Abrasion, ASTM C131, Maximum: 40 percent.

C. Either quarried rock or boulders shall be used for riprap.

D. Shape:

1. Predominantly angular.

2. Maximum dimension not greater than 3 times minimum dimension.

E. Riprap Gradation: Reasonably well graded within limits shown in Table 31 37 10A -

Riprap Gradation.

Table 31 37 10A - Riprap Gradation

Diameter, in.

Percent Smaller than

Given Size by Weight

41 100

32 70 - 90

26 35 - 55

13 0 - 20

PART 3 EXECUTION

3.01 PLACING

A. Place riprap to the outlines and thicknesses as shown on the drawings.

B. Rock in riprap need not be hand placed or compacted.

C. Place rocks so that larger rocks are evenly distributed and small rock fragments fill the spaces.

1. Include rock spalls or gravel in an amount to fill voids in riprap, but not in excess of an amount to be determined by the COR.

D. Dump and smooth by moving rocks into position so that material when in place is stable.

E. Begin riprap placement at lowest elevation and proceed up slope.

Soil Nail Walls

Revised 31 51 13 - 3

23. ASTM D4716/D4716M-14 Determining the (In-plane) Flow Rate per Unit Width and Hydraulic Transmissivity of a Geosynthetic Using a Constant Head

1.03 DEFINITIONS

A. Temporary Soil Nail Wall: Soil nail wall with service life of 18 months or less.

B. Permanent Soil Nail Wall: Soil nail wall with service life greater than 18 months.

1.04 DESIGN CRITERIA

A. Design soil nail walls using the Allowable Stress Design (ASD) method, also known as Service Load Method (SLD), as outlined in Table 5.3 on page 112 of FHWA IF-03-017.

Minimum recommended Factors of Safety for temporary structure static loads and seismic loads shall apply.

B. Size soil nail bars so maximum test load does not exceed 80 percent of the nail bar tensile allowable load.

C. The bond length necessary to maintain excavation slopes shall be designed by the Contractor’s Soil Nail Wall Design Engineer.

D. Deleted.

E. Select diameter of soil nail drill hole and method of drilling. Include details of assumptions and diameter selections. See Section 53 20 00 - Geologic Investigations and Section 53 30 00 - Records of Geologic and Subsurface Investigations. Independently evaluate the required values of soil and/or rock engineering properties, and groundwater levels necessary for proper design of the soil nails.

F. Space soil nails to minimize communication between drill holes during installation.

1.05 SUBMITTALS

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

B. RSN 31 51 13-1, Contractor Qualifications:

1. Project data for relevant projects including:

a. Resumes for Contractor’s or Subcontractor’s supervisor or representative.

b. Resume for Contractor’s or Subcontractor’s Soil Nail Wall Design Engineer responsible for design drawings and calculations.

c. Resumes showing experience of Contractor’s or Subcontractor’s staff assigned to install and test nails.

Soil Nail Walls

Revised 31 51 13 - 4

d. Brief description of scope, subsurface conditions in which soil nails were installed including contract value and completed price and total square footage of completed soil nail wall installed.

C. RSN 31 51 13-2, Approval Data:

1. Design and Working Drawings:

a. Soil nail schedule including:

1) Soil nail number.

2) Soil nail design load and calculations indicating compliance with specifications.

3) Type and size of bar.

4) Minimum total bar length, each.

5) Minimum bond length and design ultimate bond strength.

6) Minimum unbonded length.

b. Working drawings including details, dimensions, quantities, ground profiles and cross-sections necessary to construct the soil nail walls. For each type of soil nail bar include:

1) Centralizers and their location.

c. Design calculations including, but not limited to, analyses of:

1) External failure modes.

2) Internal failure modes.

3) Facing failure modes.

2. Detailed description of drilling and grouting methods and equipment, including the drill hole diameter proposed to achieve the specified pullout resistance values shown on the plans and any variation of these along the wall alignments.

3. Proposed installation methodology, sequencing, progression scheduling and verification procedures for progression of soil nail wall installation.

4. Final removal methodology and sequencing.

D. RSN 31 51 13-3, Certificates of Compliance:

1. For the following materials, if used:

a. The certificate shall state that the material or assemblies to be provided fully comply with the requirements of the contract.

1) Soil nail ultimate strength.

2) Nail bar steel.

3) Bearing plates.

4) Manufacturer's mill test reports for bars.

Secant Pile Cutoff Wall

Revised 31 56 20 - 1

SECTION 31 56 20

SECANT PILE CUTOFF WALL

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Secant Pile Cutoff Wall:

1. Measurement: Length of primary piles and secondary piles.

a. The top of the pile shall be considered the top of the work platform.

b. The length of the pile shall be the difference between the top of work platform elevation as shown on the plans and the final bottom of shaft elevation as shown on the plans. Measurement shall be made to the nearest one-tenth of a linear foot.

c. Includes secant pile guides.

d. Includes concrete.

2. Payment: Unit price offered in the Price Schedule.

1.02 REFERENCE STANDARDS

A. American Petroleum Institute (API)

1. API 13A-10 (R2015) Drilling Fluid Materials, Eighteenth Edition

1.03 SUBMITTALS

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

B. RSN 31 56 20-1, Qualifications:

1. Onsite supervisor resume.

2. Equipment operator resume.

C. RSN 31 56 20-2, Secant Pile Cutoff Wall Plans:

1. Anticipated production rates, in linear feet per day.

2. Methods and equipment used to construct secant pile cutoff wall.

a. Proposed method of excavation, including equipment and sequence of constructing cutoff wall.

b. Plan for shaft continuity control and correction.

1) Methods and frequency of monitoring trench alignment and verticality.

Revised 31 56 20 - 2

c. Plans for measuring depth, horizontal alignment, vertical alignment, and elevation at the top of shafts.

d. Contingency plan for shaft excavation and casing installation at locations that cannot be completed to required depth.

e. Contingency plan for wall continuity and shaft verticality corrections.

f. Contingency plan for shaft excavation collapse.

3. Details of Guides:

a. Methods of constructing guides.

4. Drilling fluid loss contingency plan.

5. Methods and frequency of removing loose material from bottom of the shaft excavation.

6. Pumping equipment, capacity, and backup equipment.

7. Type of set retarders or other additives to be used and conditions under which they will be used.

8. Method of disposing of excavated materials.

9. Method of winter operation of tremie system, including protection of exposed concrete surfaces and prevention of freezing water in lines and pumps.

10. Proposed Drilled Shaft Logs:

a. Include for each shaft:

1) Shaft designation.

2) Starting date and time of concrete placement.

3) Difficulties during concrete placing and times and locations where this occurs.

4) Corrective actions taken.

5) Date and ending time of concrete placement.

6) Volume of concrete placed in each shaft.

7) The theoretical volume of shaft concrete used, (volume that would have been used if the excavation dimensions were neatline dimensions).

D. RSN 31 56 20-3, Drilled Shaft Installation Logs:

1. Completed shaft installation logs for each shaft including:

a. Proposed Drilled Shaft Logs as approved and;

b. As-built elevation of bottom.

c. Final centerline, top elevation, and variation of plumb around both axes.

d. Material type at shaft bottom.

Revised 31 56 20 - 3

1.04 QUALIFICATIONS

A. Onsite Supervisor:

1. Relevant direct supervisory experience in secant pile installations in projects of 2 feet diameter or more and projects of similar complexity, ground conditions, and duration.

B. Equipment Operator:

1. Relevant experience with secant pile drilling equipment in the installation of secant piles of 2 feet diameter or more in comparable size and ground conditions.

1.05 PROJECT CONDITIONS

A. Results of Subsurface Investigations: Section 53 20 00 - Geologic Investigations and Section 53 30 00 - Records of Geologic and Subsurface Investigations.

B. Zone 1 fill materials and naturally deposited Quaternary Glacial Till soils are anticipated in the cutoff wall alignment. Refer to Section 31 24 11 - Zone 1, Impervious Fill. The naturally deposited soils are estimated to consist of approximately 70 percent to 90 percent fines, (passing #200 sieve), and approximately 0 percent to 5 percent angular to sub-rounded gravel with liquid limits ranging from approximately 20 percent to 30 percent and plasticity indexes ranging from approximately 0 percent to 15 percent.

Cobbles and boulders were not found during the field exploration, but may be present in the naturally deposited soils. Strength characteristics and additional information regarding the naturally deposited soils are reported in Section 53 20 00 - Geologic Investigations.

PART 2 PRODUCTS

2.01 MATERIALS

A. Concrete:

1. In accordance with Section 03 30 00 - Cast-In-Place Concrete.

B. Casings:

1. Screw-joint connected.

2. Smooth, clean, watertight.

3. Able to withstand handling, driving, concrete, and surrounding earth pressures.

C. Drilling Fluid:

1. In accordance with API 13A.

Revised 31 56 20 - 4

PART 3 EXECUTION

3.01 EQUIPMENT

A. Shaft Installation Equipment:

1. Equipment shall be capable of operating and performing satisfactorily in freezing conditions.

a. Drilling equipment:

1) Capable of excavation and drilling depths and diameters shown on the drawings.

2) Shaft hole diameter shall be at least 2 feet.

3) High pressure air or water installation methods shall not be used.

b. Casing installation equipment:

1) Shall have the force and torque necessary to advance through entire embankment zone fill and naturally deposited soil.

2) Capable of penetrating sporadic cobbles and boulders.

3) Maintain specified installation tolerances.

B. Tremie Placement Equipment:

1. Tremie pipes: watertight, rigid pipe or tube of sufficient length, weight and diameter to discharge concrete at the bottom of excavation.

2. Tremie pipes shall not contain aluminum parts.

3. Pressurized tremie pipes directly connected to the concrete pump:

a. 5-inch minimum diameter.

4. The inside and outside surfaces of tremie pipes shall be clean and smooth to permit flow of concrete and allow unimpeded withdrawal during concrete placing.

5. Wall thickness of tremie shall be adequate to prevent crimping.

6. Tremie pipe shall not have…