W912PP20R0004 Amendment 0001.pdf

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 items 8 and 15, and returning or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT 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 your 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.

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

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE

2. AMENDMENT/MODIFICATION NO. 3. EFFECTIVE DATE 4. REQUISITION/PURCHASE REQ. NO. 5. PROJECT NO. (If applicable)

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

STANDARD FORM 30 (REV. 10-83)

Prescribed by GSA FAR (48 CFR) 53.243

FACILITY CODE

9A. AMENDMENT OF SOLICITATION

NO.

9B. DATED (SEE ITEM 11)

10A. MODIFICATION OF CONTRACT/ORDER NO.

10B. DATED (SEE ITEM 13)

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers is extended, is not extended.

12. ACCOUNTING AND APPROPRIATION DATA (If required) copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

13. THIS ITEM ONLY APPLIES TO MODIFICATION OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

CHECK ONE A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT ORDER NO.

IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

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

15C. DATE SIGNED

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

16C. DATE SIGNED

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

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

PAGE OF PAGES

6. ISSUED BY CODE

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

CODE

15B. CONTRACTOR/OFFEROR

(Signature of person authorized to sign)

16B. UNITED STATES OF AMERICA

(Signature of Contracting Officer)

NSN 7540-01-152-8070

Previous edition unusable

W912PP20R0004

AMENDMENT No. 0001

2. SPECIFICATIONS: Delete the following listed pages and substitute the pages attached hereto. On the revised pages, for convenience, changes are emphasized by STRIKETHROUGH for deletions and UNDERLINE for additions from the previous issue. All portions of the revised (or new) pages shall apply whether or not changes have been indicated.

Delete Page Insert Page

VOLUME I VOLUME I

TABLE OF CONTENTS, page 3 TABLE OF CONTENTS, page 3 (Page 5 of VOL I Sol. and Specs.)

STANDARD FORM 1442, page 1 STANDARD FORM 1442, page 1 (Page 7 of VOL I Sol. and Specs.)

00 20 00 – INSTRUCTIONS FOR PROCUREMENT, 00 20 00 – INSTRUCTIONS FOR

page 7 of 126 (Page 22 of VOL I Sol. PROCUREMENT, page 7 of 126 and Specs)

00 21 00 – INSTRUCTIONS, page 15 of 126 00 21 00 – INSTRUCTIONS, (Page 30 of VOL I Sol. and Specs) page 15 of 126

01 14 00 – WORK RESTRICTIONS, pages 1-2 01 14 00 – WORK RESTRICTIONS, (Pages 157-158 of VOL I Sol. and Specs.) pages 1-2

VOLUME II VOLUME II

TABLE OF CONTENTS, page 3 TABLE OF CONTENTS, page 3 (Page 5 of VOL II REFERENCES)

N/A REFERENCE G - COOLIDGE DAM

OUTLET WORKS CYLINDER GATES

AND HIGH PRESSURE SLIDE GATES

INSPECTION AND EVALUATION

FINAL REPORT EXCERPT AND

APPENDIX B, Pages 10-14 and Appendix B (32 pages); Insert after REFERENCE F (2)

3. DRAWING CHANGES: The following drawings have been revised and the sequence number changed to indicate such revision:

G-001 G-001

////////LAST ITEM////////

Coolidge Dam Outlet Works Rehab San Carlos Indian Reservation, AZ

TOC -3

W912PP20R0004

RTA

DIVISION 16 – ELECTRICAL

16050 General Electrical Requirements Appendix A-Raceway/Cable Schedule Appendix B-Raceway Schedule Appendix C-Cable Routing Schedule

16110 Raceways and Fittings 16120 Wires and Cables 16140 Wiring Devices 16400 Panelboards 16450 Grounding 16490 Enclosed Power Disconnect Switches 16500 Lighting Systems 16701 Gate Local Control Panel 16702 Remote Control Station 16705 Surveillance System 16710 Intrusion Alarm System 16720 Fire Detection System 16800 Fiber Optic Cable Network

Volume II

REFERENCES

Reference A OM Manual – CD Penstocks_1986 Reference B Preliminary Guard and Regulating Gate Operating Procedures Reference C Service Manual for Guard & Regulating Gates Reference D Coolidge Dam - O&M Manual Reference E Coolidge - Bridge Load Capacity Report Final 11-05-19 Reference F (1) 1985 CD Penstock & SY Rehab EXCERPT – Ground

Investigation 1985 at Penstocks Reference F (2) CD Construction Report 1987

END OF CONTENTS

RReeffeerreennccee

RReeffeerreennccee DDrraawwiinnggss ((11))

COOLIDGE DAM OUTLET WORKS REHABILITATION, Project, San Carlos Indian Reservation, Gila and Pinal Counties, Arizona

This requirement is an Unrestricted (open to both large and small businesses) Low est Priced Technically Acceptable (LPTA) acquisition.

Magnitude of construction is betw een $10,000,000 - $25,000,000.

Proposals must be submitted in accordance w ith the requirements in Sect 00 22 16. Proposals are due at the time specif ied in Block 13. See Section 00 21 00 for information pertaining to the pre-proposal conference and site visit. For technical questions, see Section 00 20 00 pertaining to ProjNet. As this is not a sealed bid, offers w ill not be opened publicly. Please allow sufficient time for turning in your proposal.

This requirement may be cancelled, delayed or revised at any time during the solicitation process and is subject to the availability of funds.

KAREN K IRVING 505-342-3356

NOTE: In sealed bid solicitations "offer" and "offeror" mean "bid" and "bidder".

10. THE GOVERNMENT REQUIRES PERFORMANCE OF THE WORK DESCRIBED IN THESE DOCUMENTS

NEGOTIATED (RFP)

(IFB)

X

CALL:

B. TELEPHONE NO. (Include area code) (NO COLLECT CALLS)

See Item 7

2. TYPE OF SOLICITATION

SEALED BID

3. DATE ISSUED

9. FOR INFORMATION A. NAME

SOLICITATION

NSN 7540-01-155-3212 1442-101 STANDARD FORM 1442 (REV. 4-85)

Prescribed by GSA FAR (48 CFR) 53.236-1(e)

11. The Contractor shall begin performance w ithin _______10 calendar days and complete it w ithin ________630 calendar days after receiving aw ard, X notice to proceed. This performance period is X mandatory, negotiable. (See _________________________007300

12 A. THE CONTRACTOR MUST FURNISH ANY REQUIRED PERFORMANCE AND PAYMENT BONDS?

(If "YES," indicate within how many calendar days after award in Item 12B.)

X YES NO

13. ADDITIONAL SOLICITATION REQUIREMENTS:

A. Sealed offers in original and __________ copies to perform the w ork required are due at the place specif ied in Item 8 by ___________ local time ______________ (date). If this is a sealed bid solicitation, offers must be publicly opened at that time.

shall be marked to show the offeror's name and address, the solicitation number, and the date and time of fers are due.

B. An offer guarantee X is, is not required.

C. All offers are subject to the (1) w ork requirements, and (2) other provisions and clauses incorporated in the solicitation in full text or by reference.

D. Offers providing less than _______60 calendar days for Government acceptance after the date offers are due w ill not be considered and w ill be rejected.

SOLICITATION, OFFER,

AND AWARD

(Construction, Alteration, or Repair)

1. SOLICITATION NO.

IMPORTANT - The "offer" section on the reverse must be fully completed by offeror.

4. CONTRACT NO.

7. ISSUED BY CODE

US ARMY ENGINEER DISTRICT, ALBUQUERQUE

4101 JEFFERSON PLAZA NE

ALBUQUERQUE NM 87109-3435

W912PP

PAGE OF PAGES

CODE

(Title, identifying no., date):

12B. CALENDAR DAYS

(hour) Sealed envelopes containing offers

5. REQUISITION/PURCHASE REQUEST NO. 6. PROJECT NO.

8. ADDRESS OFFER TO (If Other Than Item 7)

505-342-3496FAX:TEL: TEL: FAX:

W912PP20R0004 1 OF 12

3 JUL 2020

CONTRACTING OFFICER AUTHORITY

The Contracting Officer who signs this contract will be the primary Contracting Officer for this contract. However, any Contracting Officer assigned to the Albuquerque District, contracting within his or her authority, may take formal action on this contract when a contract action needs to be taken and the primary Contracting Officer is unavailable.

NAICS CODE AND SMALL BUSINESS SIZE STANDARD

The North American Industry Classification System (NAICS) code for this acquisition is 237990. The small business size standard is: the average annual receipts of the concern and its affiliates for the preceding three fiscal years must not exceed $39.5 million.

The small business size standard for a concern which submits an offer in its own name, other than on a construction or service contract, but which proposes to furnish a product which it did not itself manufacture, is 500 employees.

ESTIMATED CONSTRUCTION COST (FAR 36.204)

The estimated magnitude of construction for this project is between $10,000,000.00 and $25,000,000.00.

INSTRUCTIONS FOR SUBMISSION OF THE PRICE PROPOSAL

The offeror shall submit to the Government a price proposal broken out by line item in the format indicated on the Proposal Schedule in Section 001000 of this solicitation. A cost-element breakdown, in sufficient detail for the Government to perform a cost analysis, shall be attached for each proposed line item and must reflect any specific requirements established by the Contracting Officer. Supporting breakdowns must be furnished for each cost element, consistent with the offeror's cost accounting system, and shall include basic elements of cost such as direct labor, materials, equipment, and subcontracted items. Indirect costs, including markups, for field overhead, general and administrative expenses, gross receipt taxes or other taxes, bond rate, profit, and any other applicable costs shall also be provided.

WHO MAY SUBMIT PROPOSALS

Any legally organized Offeror may submit a proposal.

Firms submitting a proposal as a joint venture (JV) must ensure the following requirements are met:

a. Obtain a Tax Identification Number (TIN) for the joint venture.

b. Prepare the Section 004500, Representations and Certifications as a joint venture (e.g., providing the TIN for the JV)

c. Register in the System for Award Management (SAM) formerly Central Contractor Registration

(CCR) as a joint venture in which a unique CAGE Code will be obtained. See FAR Clause 52.204-7, System for Award Management and DFARS Clause 252.204-7004; Alternate A, System for Award Management for further information in Section 007000.

d. Provide a copy of the JV agreement in the proposal submission.

SYSTEM FOR AWARD MANAGEMENT (SAM) REGISTRATION

https://www.sam.gov/portal/public/SAM/, is current per FAR 52.204-13, System for Award Management Registration (July 2013). (This clause is included in Section 007000 of this RFP.)

a. Performance and Payment Bonds. Within ten (10) calendar days after contract award, and prior to contract performance, the Contractor shall furnish two bonds, a Performance Bond (Standard Form 25) and a Payment Bond (Standard Form 25-A), each with good and sufficient surety or

(1)

(a) Protests, as defined in section 33.101 of the Federal Acquisition Regulation, that are filed directly with an agency, and copies of any protests that are filed with the Government Accountability Office (GAO), shall be served on the Contracting Officer (addressed as follows) by obtaining written and dated acknowledgment of receipt from

USACE

Contracting Division (Attn: Contracting Officer) 4101 Jefferson Plaza NE Albuquerque, NM 87109

(b) The copy of any protest shall be received in the office designated above within one day of filing a protest with the GAO.

(End of provision)

The clauses at 52.236-2, Differing Site Conditions, and 52.236-3, Site Investigations and Conditions Affecting the Work, will be included in any contract awarded as a result of this solicitation. Accordingly, offerors or quoters are urged and expected to inspect the site where the work will be performed.

An organized site visit has been scheduled for , 2020 at 10:00am.

(c) Participants will meet at the lower side of the dam in the center dome.

Directions to the dam site:

(Lat. N 33o 1 . W 110o 3

LOCATION AND ROUTE TO DAMSITE:

Coolidge Dam is located on the Gila River, approx. 14 miles south/southeast of San Carlos, Arizona; and approx. 22 miles southeast of Globe, Arizona. It impounds San Carlos Lake.

Access from Globe AZ: Take AZ State Route 70 east approx. 17 miles, turn south on AZ State Route 170/Tribal Route 3 (access road is on the North side of AZ State Route 70 by US Post Office and Bashas Supermarket), approx.

13 miles to Damsite.

Access from Safford, Arizona: Travelwest on AZ State Route 70 approx. 60 miles, turn south on AZ State Route 170/Tribal Route 3 (access road is on the North side of AZ State Route 70 by US Post Office and Bashas Supermarket), approx. 13 miles to Damsite.

(d) Offerors are cautioned that nothing said or done at the pre-proposal conference or site visit will qualify or modify the terms of the solicitation document. The only instrument that shall qualify or modify the solicitation document is a formal amendment, in writing, per FAR 15.206.

Please send the list of names of attendees to karen.k.irving@usace.army.mil by NOON 5 June 2020.

(End of provision)

(1)

All visitors will have their temperatures checked before admittance by local authority.(1)

NO QUESTIONS WILL BE ANSWERED AT THE SITE VISIT. ALL

QUESTIONS MUST BE SUBMITTED VIA PROJNET IN ACCORDANCE WITH THE RFP.

A teleconference will be held PRIOR - June 8, 2020 10:00am. (1) Teleconference Call-In Number: 1-866-724-1155 Teleconference Participant code: 48934057

SECTION 01 14 00

WORK RESTRICTIONS

Coolidge Dam Outlet Works Rehab

01 14 00 -1

GENERAL

SECTION INCLUDES

This section covers the restrictions for sequencing the work and maintenance of irrigation and river flows.

GENERAL PROJECT RESTRICTIONS

Location, construction, operation, maintenance, and removal of construction facilities on Tribal land will be subject to approval of the COR or BIA Representative.

Housing for construction personnel will not be permitted at jobsite, except temporary housing for guards or watchmen as approved by the COR or BIA Representative.

WORKS RESTRICTIONS AND CONSTRAINTS

A. The Contractor shall perform on-site construction activities during one continuous period of time from start through commissioning of the two outlets. It is expected that long-term procurements (such as the butterfly valves and slide gate hydraulic power units) will be ordered in advance of the start of on-site construction and will be delivered on-site strategically during the established construction time frame. Multiple starts and stops to construction activities shall not be permitted unless approved in advance by the Government

B. Only one of the two low level outlet conduits can be taken out of service at a time. Project requires near-continuous releases downstream.

C. Contractor will have access to only one low level outlet at a time.

D. All work in the first low level outlet shall be completed by the Contractor and accepted by the

Government before access is granted to the second tower.

E. Contractor will not have access to first tower after acceptance of work unless approved by the Government.

F. The reservoir will not be drained for this work. Water level in the towers and will match water level in reservoir. Dewatering of the outlet tower will not be permitted.

G. The Government will be responsible for operation of the low level guard and regulating gates unless otherwise approved by the Government. Contractor shall provide a minimum of 3 days’ notice for these services and the approximate duration of time for which the services are required.

H. Refer to Paragraph 1.15 for outage request requirements.

SECTION 01 14 00

WORK RESTRICTIONS

Coolidge Dam Outlet Works Rehab

01 14 00 -2

I. The roadway over the dam can only be taken out of service for short intervals of time as dictated by the Government. Road closure shall only be considered as a last resort and will only be permitted if approved by the Government on a case by case basis.

J. Acceptable laydown areas, available to the Contractor are limited to those specified herein.

1.04 OUTAGE REQUIREMENTS

A. RSN 01146-1 Outage Request; Contractor shall submit Outage Request for any disruptions which affect the normal operation of the facility which shall include:

1. Area where work will be performed

2. Outline procedures for accomplishing the work including specific safety precautions to be taken, type and location of barricades, warning signs, and protective grounds and devices to be used.

3. Commencement time of work

4. Duration of work

5. Number of personnel and their classification

6. Description of equipment to be used

7. Information indicating that the required materials are on site or data indicating shipping dates of materials not on site.

B. Conditions

1. Schedule and coordinate outages with the Government

2. No specific request for an outage will be considered unless the Government has reasonable assurances that materials and equipment required for work will be on site and Contractor will be prepared to perform work on date and during period of time requested for specific outage. When work cannot be performed during an approved outage period, notify the Government that outage is not required.

3. Show construction outages greater than 4 hours in the construction schedule.

4. Work shall be coordinated with project operations. Outage scheduling will depend upon operating conditions. Government reserves right to schedule outages for any period during 24-hour day, any day of week. Contractor will be informed of type of outages available and restrictions prior to start of construction. Contractor’s request for outages, scheduling of work, delivery of materials on site, and submittal of drawings and data as required, will be governed by allowable time and outage periods available.

Coolidge Dam Outlet Works Rehab

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W912PP20R0004

RTA

DIVISION 16 – ELECTRICAL

16050 General Electrical Requirements Appendix A-Raceway/Cable Schedule Appendix B-Raceway Schedule Appendix C-Cable Routing Schedule

16110 Raceways and Fittings 16120 Wires and Cables 16140 Wiring Devices 16400 Panelboards 16450 Grounding 16490 Enclosed Power Disconnect Switches 16500 Lighting Systems 16701 Gate Local Control Panel 16702 Remote Control Station 16705 Surveillance System 16710 Intrusion Alarm System 16720 Fire Detection System 16800 Fiber Optic Cable Network

Volume II

REFERENCES

Reference A OM Manual – CD Penstocks_1986 Reference B Preliminary Guard and Regulating Gate Operating Procedures Reference C Service Manual for Guard & Regulating Gates Reference D Coolidge Dam - O&M Manual Reference E Coolidge - Bridge Load Capacity Report Final 11-05-19 Reference F (1) 1985 CD Penstock & SY Rehab EXCERPT – Ground

Investigation 1985 at Penstocks Reference F (2) CD Construction Report 1987

END OF CONTENTS

RReeffeerreennccee

RReeffeerreennccee DDrraawwiinnggss ((11))

COOLIDGE DAM OUTLET

WORKS REHABILITATION

REFERENCE G - COOLIDGE DAM OUTLET WORKS CYLINDER

GATES AND HIGH PRESSURE SLIDE GATES INSPECTION AND

EVALUATION FINAL REPORT EXCERPT AND APPENDIX B

Coolidge Dam Outlet Works

Cylinder Gates and High Pressure Slide Gates Inspection/Evaluation FINAL

Coolidge Dam – Outlet Works Page 10

During the second inspection in June, the West Cylinder Gate was operated to allow dewatering of the conduit for inspection of the liner and the readily accessible portions of the high pressure slide gates. The East Cylinder Gate was not operated and therefore the east conduit was not inspected.

The inspection was performed to develop an updated assessment of the condition of the LLO gate systems and the needs, extent and challenges associated with the upcoming rehabilitation.

The inspection included discussions with plant operation staff regarding operations, maintenance and past problems with the gate systems were also performed.

The inspection included the following:

Cursory inspection of cylinder gates and cylinder gate hoists.

Visual inspection of the East HPU and West HPU for high pressure slide gates.

Visual inspection of the high pressure slide gate cylinders.

Operational observation of all four high pressure slide gates; one set of regulating and guard gate on east and west side.

Underwater ROV inspection of the base of the outlet towers from within the towers.

Underwater diver inspection of the base of the outlet towers on the exterior and the surrounding area immediately adjacent to the intake openings.

Hydrographic survey of the reservoir floor in the vicinity of the outlet towers.

No field measurements were made during the inspection. Similarly, as-built field verification of the HPU was not performed. Catalog cuts and the O & M manual have been relied upon as accurate in this instance.

The underwater portion of the inspections was performed by Associated Underwater Services (AUS) of Spokane, WA. A remote operated vehicle (ROV) was used for the underwater inspection inside the two towers instead of divers due to the severe access restrictions. Divers performed the inspections on the exterior of each of the towers. AUS also performed the hydrographic survey work at the site as further described below. Refer to Appendix B for the inspection report and survey data as prepared by AUS.

5.1.2 Inspection Plan

Inspection plans were provided for both inspections. The plans are included herein as Appendix A. In general, the inspections were performed in accordance with the plans with alterations as needed to suit operational and access restrictions.

5.1.3 Inspection Limitations

The following inspection limitations for the subject inspections are noted below.

The cylinder gate structures were not inspected as part of this work. The results of the 2004 climbing inspection had previously determined these gates to be in poor condition.

The inspection report prepared by the USBR was relied upon for assessment of their condition and ultimate rehabilitation/removal.

Coolidge Dam – Outlet Works Page 11

Neither the East nor West Cylinder Gates were operated in the presence of the Engineers. The East gate was not moved at all during the inspection and has been locked out. The West Cylinder Gate was operated prior to the MWH field visit to dewater the West LLO Works conduit.

Since the East Cylinder Gate was inoperable, inspection of the East LLO conduit and gates could not be performed.

MWH inspectors did not witness operation of the East Tower high pressure slide gates.

The visibility of the water was generally limited to less than 18 in. inside the tower for the underwater inspection. This was often further reduced when silt was stirred from the bottom. This limited the ROV inspection significantly. The visibility on the exterior was slightly better.

5.2 Inspection Findings - Hydrographic Survey at Dam and Intakes

A hydrographic survey of the reservoir floor immediately upstream of the dam and around the two outlet towers was performed on June 13, 2014 by AUS. The survey utilized a multi-beam sonar and GPS positioning system. Refer to Appendix B for the survey. The survey was referenced to the published water surface at the time of the survey as described in Section 1.4.

The reservoir floor was generally flat at approximately El 2386 to El 2388 immediately upstream of the dam. A minor depression of as much as 4 ft. was observed upstream of the West Tower.

There was no significant depression upstream of the East Tower.

The survey, in the immediate vicinity of each tower, identified abrupt decreases in water depth on the South, West, and to a lesser extent, East sides of each tower. The underwater inspection of the tower exteriors confirmed this to generally the result of large buildups of debris, consisting of gunite slabs (from the dam face surfacing), mud and timber debris. This will be further discussed in the following section.

5.3 Inspection Findings - Intake Trashracks and Debris Buildup

The trashracks covering the 8 intakes into each tower, each approximately 8.5 ft. wide by 10 ft.

high, were inspected from the outside of the tower by divers. Approximately 2 to 3 of the trashracks were also inspected from the inside of the tower with the ROV.

The steel trashracks all are securely mounted to the tower structure and the structural members consistently looked to be near full section with negligible section loss to the metal. Corrosion nodules were generally present at numerous locations indicating that any paint coating has failed, but section loss is considered minimal.

The trashracks were partially blocked with debris at both intakes as follows:

West Tower

Total Estimated Blockage: 50%-60%

North and Northeast Sides: Trashrack exposed 5 ft. to 7 ft. Blockage generally mud and timber debris.

East and Southeast Sides: Trashrack exposed approximately 4 ft. Blockage generally mud, timber debris and gunite slabs.

Coolidge Dam – Outlet Works Page 12

South Side: Trashrack exposed approximately 1 ft. Blockage generally timber debris and gunite slabs.

West and Southwest Sides: Trashrack exposed approximately 4 ft. Blockage generally mud, timber debris and gunite slabs.

Large buildup of gunite immediately adjacent to East, West and South sides of tower.

East Tower

Total Estimated Blockage: 60%-70%

North Side: Trashrack exposed 4 ft. Blockage generally mud and timber debris.

East Side: Trashrack exposed approximately 4 ft. Blockage generally mud, timber debris and gunite slabs.

South Side: Trashrack exposed approximately 2 ft. Blockage generally timber debris and gunite slabs.

West Side: Trashrack exposed approximately 2 ft. Blockage generally gunite slabs.

Large buildup of gunite immediately adjacent to East, West and South sides of tower.

Generally, the debris had accumulated against the upstream side of the trashracks but has not penetrated to the downstream side indicating the trashracks are secure and are generally performing their role. During the underwater inspection of the inside of the two towers, however, small debris, generally consisting of small sticks and broken pieces of gunite, were present on the floor. During the inspection of the West Tower, this debris, plus apparent slabs of flaked-off rust from the cylinder gate, covered the seal ring for the cylinder gate. The East Tower had a lesser accumulation of debris downstream on the racks and no buildup on the seal ring.

5.4 Inspection Findings – Outlet Towers and Cylinder Gates

5.4.1 General

The outlet towers and the cylinder gates were only given a cursory inspection to the extent that they could be accessed from the upper tower platform and with the ROV near the bottom.

Severe access limitations precluded a detailed inspection of the cylinder gates. As stated in Section 3.3., a detailed climbing inspection of the inside of the gate cylinder was performed in 2004 by the USBR. The findings of that inspection resulted in the decision to replace the cylinder gates due to their condition.

As part of the current work scope, previously published information on the past findings were reviewed. Those findings, combined with the 2014 inspection findings and discussions with operations staff have been used to confirm the past recommendation to replace the gates.

The 2014 underwater inspection of the inside of the towers was intended to focus on the condition of the embedded cast iron seal rings on which the cylinder gates seal as well as the condition of the concrete at the base of the tower.

Coolidge Dam – Outlet Works Page 13

5.4.2 Gate Embedded Parts and Internal Tower Condition at Intakes

The embedded parts for each cylinder gate are limited to the 8 ft. diameter cast iron seal ring, embedded in the concrete at the base of the tower at El. 2383. At both the East and West Towers, the ROV inspection verified this ring to be present, in general conformance with the shape indicated on available drawings and neither excessively corroded or eroded. A significant chamfer at the ID edge, estimated to be approximately 1.5 to 2 in., is present as shown on the available drawings. The extent of pitting and surface irregularities could not be measured with the ROV but visually it appears that the exposed ring surfaces can continue to be used as a sealing surface for the replacement gate. Minor grinding would likely provide an improved sealing surface for a rubber or metal seal. The concrete condition adjacent to the seal ring also appeared to be in acceptable condition.

The gate rollers appear to roll along the concrete face of the outlet tower. The ROV could not generally access the annular area outside the gate OD but where visible, the inner walls of the circular tower appeared smooth. The tower concrete surface condition of the 8 intakes from the trashracks to the tower ID, including the intermediate piers and center horizontal trashrack support beams all were judged to be in good condition.

Significant cracks as wide as ½ in. were observed throughout the base of the structure both inside the tower and outside the tower. This cracking was more evident at the East Tower but was present at both towers at several locations. Appendix B provides several photographs of the cracking identified.

The floor of the West Tower was covered with broken pieces of gunite, light timber debris and large flakes of corroded metal (apparently from the cylinder gate. The debris covered a significant portion of the seal ring. The East Tower, which had been passing water until immediately prior to the ROV inspection was clear of debris.

5.4.3 Conduit Venting

The original Outlet tower drawing (“Outlet Tower Details”, Dwg. A-IV-8) indicates that a 6 in.

diameter vent pipe, embedded in the tower wall, vents the vertical conduit shaft. The vent opening is apparently located 4 ft. below the cylinder gate seal ring as shown in Figure 4. The inspection could not locate the lower end of the vent by ROV inspection. BIA staff did confirm the presence of the vent from the top where it exits the inside tower wall at approximately El.

2535 at a gooseneck pipe. A weighted line was dropped into the vent to verify continuity.

A 10 in. filling line is present connecting the East and West conduits. The fill line enters each conduit at the crown, downstream of the bifurcation.

5.4.4 Cylinder Gates Structure

A detailed inspection of the internal portion of the two cylinder gates was performed by the USBR using a rope access climbing team in March, 2004. At that time the gates were concluded to be heavily corroded and in poor condition and were ordered locked out in the open position. Refer to Section 3.3 and Reference 2 for additional details of these inspection findings.

The structures of the East and West Cylinder Gates were not re-inspected as part of the work due to access restrictions; however, the underwater ROV inspection did capture the gate condition near the bottom of each gate and a cursory inspection was also performed of the top portion of the gates, hoist support structures and dogging devices from the maintenance platform at the tower. Key findings were as follows:

Coolidge Dam – Outlet Works Page 14

The ROV inspection confirmed heavy corrosion near the bottom of the gate on the inside of the cylinder. Reinforcing ribs appeared heavily corroded throughout the lower portion of the structure. The bottom seal assembly was confirmed in place but was also heavily corroded and coated with oxidation.

The West LLO conduit, which was dewatered for inspection, had a buildup of large flakes of corrosion piled on the conduit invert as shown in Photograph 27. This clearly came from the ID of the cylinder gate. A 5 ft. length of corroded steel bar was also found at the conduit invert as shown in Photograph 28. This appeared to be a length of ladder which appears to have broken free from the ID of the cylinder gate.

Plates supporting the tie rods for the hydraulic cylinder were noticeably bent at the West cylinder. Refer to Photograph 6.

Cracks, previously found in the large steel dogging hooks by maintenance staff, were previously repaired with reinforcement plates, welded on to the structure. Refer to Photograph 7.

Paint coating has clearly failed throughout the structure and significant corrosion is clearly evident on the normally submerged portions of the gate.

5.4.5 Cylinder Gates Hydraulic Hoist System

The hydraulic piping, valves and other hydraulic equipment showed the signs of extensive oil leakage and spillage. Piping appears to be corroded and leaking, with oil drops evident along the entire length of the piping and at valve locations. There are not sufficient hydraulic pipe supports and the ones present are corroded. The HPU reservoir tank is corroded and there is no slight glass and breather filter to prevent moisture ingress. Oil spillage around the hydraulic pump and cylinder indicates that there are seal issues.

The hydraulic system is a low pressure system, and the hydraulic equipment and hydraulic circuit is outdated. Overall the condition of the HPU, hydraulic cylinder and hydraulic piping was found to be poor, and cannot be re-used without incurring high rehabilitation/replacement cost.

5.5 Inspection Findings - High Pressure Slide Gates

5.5.1 General

Operating problems encountered on the West set of high pressure outlet slide gates (Gates 1 and 3) and LOTO’s on the East set of gates (Gates 2 and 4) during the November 2013 prevented their operation. The high pressure outlet slide gates were all considered operational during the June 2014 inspection.

The West side guard gate (Gate 1) and the West side regulating gate (Gate 3) were inspected from within the dewatered conduit during the June 2014 inspection. MWH witnessed operation of the West set of gates as well. The East gates (Gates 2 and 4) could not be inspected from the inside of the conduit because the conduit could not be drained.

In general, the slide gates and their hydraulic hoists were found to be in fair condition. The gate operating system is very basic with several notable shortcomings in the design. Findings of the inspection are as identified below.

Coolidge Dam – Outlet Works

APPENDIX B

2014 AUS Underwater Inspection Report, Hydrographic Survey and

Inspection DVD’s

July 22, 2014

Michael J. Morgan Principle Engineer MWH Americas, Inc.

2353 130th Avenue N.E.

Suite 200 520 Corporate Center Bellevue, WA 98005

RE: COOLIDGE DAM OUTLET WORKS INSPECTION

Dear Mike, Associated Underwater Services (AUS) conducted an inspection of the Coolidge Dam for MWH, Americas, Inc. The dam is located at the southwest end of San Carlos Reservoir, approximately 22 miles SE of Globe, AZ. The inspection took place on June 11 – 13, 2014 and was comprised of three distinct but related activities;

ROV video inspection of the interior of the two intake towers, diver video inspection of the exterior of the two intake towers, and Multibeam Echosounder (MBES) bathymetric survey of the forebay. AUS was assisted and observed by MWH (yourself being the client representative) and Bureau of Indian Affairs (BIA) (who own and operate the dam) personnel during all phases of the inspection. The purpose of the inspection was to document the current condition of the two intake towers to support renovation efforts, i.e., the Coolidge Dam Outlet Works Rehabilitation Project.

Mobilization The AUS personnel and equipment were mobilized from the Spokane, WA (Diving personnel and equipment), Kenmore, WA (MBES and diving personnel), Southern CA (Surveyor and Project Manager) bases of operations.

The following AUS personnel were utilized:

Kerry Donohue Project Manager Casey Jones Dive Supervisor Ralph Balde Diver Devon Donohue Diver Brat Peterson Tender Rick Hollar ROV Technician and Hydrographic Engineer

The AUS crew arrived on Tuesday June 10, 2014 and checked into the Best Western Apache Gold Hotel. A pre-project meeting was held in the parking lot of the hotel in the morning of Wednesday June 11, 2014 with MWH, BIA, and AUS personnel were in attendance. Topics of discussion were introductions, project expectations, work flow, and general safety aspects of the project. Following the meeting, the entire assembly proceeded to the dam to begin the inspection activities.

Main Office:

3901 E Ferry Ave

Spokane, WA 99202

Ph: (509) 533.6500

Fax: (509) 533.6505

Branch Office:

6706 NE 175th St., Unit D

Kenmore, WA 98028

Ph: (425) 487.0329

Fax: (425) 487.0364

Associated Underwater Services, Inc.

Inspection Activities The inspection activities proceeded as follows:

Wednesday June 11, 2014 o Installation of ROV Video Survey equipment o ROV Video Survey of West Intake Tower o ROV Video Survey of East Intake Tower o Disassembly of ROV Video Survey equipment o Set up of dive chamber o Set up of dive equipment onboard dive/survey vessel

Thursday June 12, 2014 o Diver Video Inspection of East Tower o Diver Video Inspection of West Tower o Removal of diver equipment from dive/survey vessel o Set up of RTK GPS base station on dam o Set up of MBES equipment onboard dive/survey vessel

Friday June 13, 2014 o MBES survey o Calibration of MBES equipment o Removal of MBES equipment from dive/survey vessel o Demobilization and exit project area

ROV Video Survey

The following equipment was used for the ROV Video Survey of the two intake towers:

SeaBotix LBV ROV w/Video Camera, Diver Audio System, and Diver DVD Audio/Video Recording System.

The SeaBotix LBV was selected for the ROV survey because its small size, light weight, and high maneuverability suited the operational constraints presented by the intake towers configurations.

The ROV Video Survey equipment was initially set up in the West Intake tower. While the equipment was being installed, MWH and BIA personnel made a visual inspection of the dewatered tunnel and low level outlet slide gates while the cylinder gate was in the closed position. Following the completion of the tunnel inspection, BIA operated the gates so that the tower was flooded but with no residual flow to facilitate the ROV survey. The West cylinder gate was raised to the open position and the lock out/tag out protocol was initiated for the West Intake Tower to prevent inadvertent operation of the gates during the survey.

The ROV was lowered into the intake tower on the umbilical by hand until it reached the surface of the water, some 100 ft from the top of the tower. From there, the ROV was flown by the ROV pilot using the control console at the top of the tower. Water visibility inside the tower was estimated at 12-18 inches. A video recording with audio annotations was recorded of the entire ROV dive. The ROV was maneuvered through the interior of the base of the tower while documenting the general condition of the structure with emphasis on the extent of concrete spalling and cracks, condition of gate sealing surface, condition of gate knife edge, and condition and blockage of trash racks. When the client representative was satisfied with the survey, the ROV was flown to the surface of the water and then raised to the top of the tower on the umbilical by hand.

The lock out/tag out protocol was released and operation of the West Intake Tower was returned to BIA control. The ROV equipment was disconnected, transported to the East Intake Tower, and re-installed at the top of that tower. The East cylinder gate was locked out in the raised position (it was not operated at any time during the inspection work). The downstream low level slide gates were closed to shut off the flow. The lock out/tag out protocol was initiated for the East Tower. The ROV survey of the East Intake Tower proceeded in the same manner as at the West Intake Tower. Water visibility inside the tower was estimated at 12-18 inches. Following recovery of the ROV, the lock out/tag out protocol was released and operation of the East Intake Tower was returned to BIA.

Diver Video Survey

The following equipment was used during the diver video survey:

Surface Supplied Dive Station, Emergency bailout air supply (at least 30cf) with valves and gauges, Knife for each diver, Watch for each diver, Pneumofathometer, Surface supplied diving equipment, Communications equipment (two way voice communications), First aid kit, Compressors with filters for breathing air, Direct source compressor with sufficient capacity to overcome any line loss or other losses and deliver a minimum 4.5cfm to each diver at the maximum diving depth, High pressure primary and reserve air back up, ABC fire extinguisher, Minimum of two 300' dive hoses, US Navy Dive manual, Emergency oxygen and Ambu bag, Dry suits, Ladder, Stokes litter, International Code Alpha Flag and recreational dive flags, Hot water machine, Decompression Chamber, Diver audio/video camera and DVD recording system, and 24’ Aluminum Dive/Survey Vessel.

The emergency dive package including a hyperbaric chamber was assembled and checked for proper operation on Wednesday June 11, 2014. The diver equipment was installed onboard the dive/survey vessel and checked for proper operation.

The Diver Video survey took place on Thursday June 12, 2014. The AUS dive team consisted of a diver supervisor, diver, standby diver, and tender. The dive team was accompanied on the dive/survey vessel by the client representative and a representative from BIA. The vessel proceeded to the East Intake Tower and the lock out/tag out protocol was initiated for the West Intake Tower to prevent inadvertent operation of the gates during the survey. The diver, equipped with a helmet-mounted underwater video camera began the survey while recording continuous video. The diver inspected each of the trash racks in turn noting the depth of the top of structure, top of trash rack, and forebay bottom. Any damage to the concrete or trash racks and nature of the debris at the trash racks was noted and documented. Water visibility on the exterior of the tower was approximately 3 ft. When the client representative was satisfied with the thoroughness of the survey, the diver returned to the dive/survey vessel and the dive end. The lock out/tag out protocol was released and control of the East Intake Tower was returned to BIA.

The vessel then proceeded to the West Intake Tower. The lock out/tag out protocol was initiated for the West Intake Tower to prevent inadvertent operation of the gates during the survey. The survey procedure for the West Intake Tower was identical to that of the East Intake Tower. Water visibility on the exterior of the tower was approximately 3 ft. When the dive was completed, the diver returned to the dive/survey vessel.

The lock out/tag out protocol was released and control of the West Intake Tower returned to BIA.

All work was performed in compliance with the AUS Safe Practices Manual, OSHA and the ADCI regulations as per specifications.

The dive vessel returned to the launch area and the dive equipment was removed from the vessel in preparation for the MBES survey. The emergency dive package was disassembled and prepared for transit.

Multibeam Echosounder Survey The following equipment was used for the survey:

Seatex 330 Positioning System consisting of o Trimble RTK/Differential Dual Antenna GPS Receiver, o Pacific Crest Radio Modem Receiver, o Seatex 5 Motion Sensor, Kongsberg EM 3002 MBES Processor and Transducer, Kongsberg Seafloor Information System Computer, Valeport Sound Velocity Probe, Hemisphere RTK GPS Base Station Receiver, Pacific Crest Radio Modem Transmitter, and Hypack Data Acquisition laptop computer 24 ft Aluminum Dive/Survey Vessel

The MBES equipment was installed on the dive/survey vessel following completion of the Diver Video survey on Thursday June 12, 2014. The installation and check out was not complete by the end of the day, so the survey was slated for the following day.

The MBES survey was conducted on Friday June 13, 2014. A RTK GPS base station with a radio modem transmitter was set up over a control monument (USACE #3) located on the dam near the top of the West Intake Tower. The MBES equipment was checked for proper operation and the dive/survey vessel proceeded from the launch area to the dam. A sound velocity profile was recorded and the data input into the MBES processing software. Four offset dam-parallel lines were surveyed across the face of the dam while recording sounding data. Then the vessel was maneuvered around the two intake towers to obtain sounding data between the towers and the dam. The sounding data was check to assure that the recorded data completely covered the area in front of the data. The vessel then proceeded away from the dam and sounding data were recorded along two lines for use in calibrating the offsets between the various sensors, i.e. GPS antenna, MBES transducer, and motion sensor.

The vessel returned to the launch area and the MBES equipment was removed from the vessel and repackaged from transit.

Deliverables The deliverables for the Coolidge Dam outlet works inspection include:

DVD video of the West Intake Tower ROV survey (submitted previously), DVD video of the East Intake Tower ROV survey (submitted previously), DVD video of the East Intake Tower diver survey (submitted with this report) DVD video of the West Intake Tower diver survey (submitted with this report), AutoCAD plan view drawing file presenting the results of the MBES survey (submitted with this report, ASCII file with thinned (one ft, minimum) MBES sounding data, and This letter report.

Summary of Results ROV Video Survey

A summary of the ROV Video Survey observations follow:

West Tower Concrete in generally good condition with little spalling;

Gate sealing surface covered by several inches of debris and not visible;

Gate knife edge in poor and heavily corroded condition;

Trash racks in good condition with limited rust but partially blocked by exterior debris; and Hydraulic oil, probably from gate control system, evident on water surface.

East Tower Concrete in generally good condition with little spalling;

Gate sealing surface exposed and in good condition, Gate knife edge in poor and heavily corroded condition;

Trash racks in good condition with limited rust but partially blocked by exterior debris;

Hydraulic oil, probably from gate control system, evident on water surface; and A scan of the vertical shaft, approximately 4 ft. below the cylinder gate sealing surface could not locate the 6 in. vent outlet shown on the original drawings.

Screen grab images from the ROV Video Survey are included with this report.

Diver Video Survey The elevation of the forebay still water level during the diver video survey was 2418.4 ft. A summary of the diver’s observations follows:

West Tower Inspection time: approximately 1 hr.

Depth of ledge above trash rack was 23 ft;

Depth of top of trash rack was 28 ft North and Northeast Side of Tower o Depth of forebay was 35 ft; trash rack exposed 5-7 ft; and o Debris comprised of mud and sticks.

East and Southeast Side of Tower o Depth of forebay was 32 ft; trash rack exposed 4 ft; and o Debris comprised of mud, sticks, and gunite.

South Side of Tower o Depth of forebay was 29 ft; trash rack exposed 1 ft; and o Debris comprised of sticks and gunite.

West and Southwest Side of Tower o Depth of forebay was 32 ft; trash rack exposed 4 ft;

o Debris comprised of mud, sticks, and gunite; and o Horizontal crack (maximum width 2 and 1/2 inches, average width 1/2 inch), 2 ft down from ledge.

Large stacked congregation of Gunite typically approximately 3 ft in diameter;

Trash racks securely bolted to face of tower;

Trash rack anchor bolts were exposed, undamaged, and appeared in good condition;

Trash rack bars were one half inch thick and 6 inched wide;

Rack bars had 3/8 inch corrosion nodules but had minimal section loss when scraped, and Except as noted above, cracks were less than 1/4 inch wide.

East Tower Inspection time: approximately 1 hr.

Depth of ledge above trash rack was 23 ft;

Depth of top of trash rack was 28 ft;

North Side of Tower o Depth of forebay was 32 ft; trash rack exposed 4 ft; and o Debris comprised of mud and sticks.

East Side of Tower o Depth of forebay was 32 ft; trash rack exposed 4 ft;

o Debris comprised of mud, sticks, and gunite; and o Vertical Cracks 1/2 wide between ledge and trash rack.

South Side of Tower o Depth of forebay was 30 ft; trash rack exposed 2 ft;

o Debris comprised of mud, sticks, and gunite; and o 8 inch diameter log outside but near trash rack.

West Side of Tower o Depth of forebay was 28-30 ft; trash rack exposed 2 ft; and o Debris comprised of gunite.

Large stacked congregation of Gunite typically approximately 3 ft in diameter;

Trash racks securely bolted to face of tower;

Bolts were exposed, undamaged, and appeared in good condition;

Trash rack bars were one half inch thick and 6 inched wide;

Rack bars had 3/8 inch corrosion nodules but had minimal section loss when scraped, and Except as noted above, cracks were less than 1/4 inch wide.

Multibeam Echosounder Survey The floor of the forebay is smooth with few obstructions, The elevation of the forebay is approximately 2389 ft and is slightly deeper near the dam face, A shallow depression, approximately 4 ft deep and 100 ft wide, exists around the West Intake

Tower, Debris has built up around the base of both towers near particularly on the southern side between the towers and the face of the dam (see diver’s observations above), The acoustic sounding data in the immediate vicinity of the intake towers were erratic as a result of the irregular…