Attachment_1_-_Performance_Work_Statement.pdf

Navajo Dam Bypass Line Repair

Performance Work Statement (PWS)

1. INTRODUCTION & BACKGROUND

The domestic water supply line at Navajo Dam is exhibiting signs of failure and beginning to leak.

Several repairs to the line have been completed in recent history, however additional repair work is needed to keep it functional and reliable.

Approximately 1,000 feet downstream of the water line connection, there is a portion of 3-inch diameter galvanized steel pipe, two valves, and a strainer that connects the domestic water line to a 6-inch diameter penstock gate bypass water supply line. This section of piping and valves is old, exhibiting corrosion, and is believed to have wall thickness loss. It is a critical connection for the domestic water supply and needs to be replaced with new reliable components.

The domestic water supply line passes through a buried vault where it transitions from galvanized steel piping to polyvinylchloride (PVC) piping. The transition connection components are currently leaking.

The existing transition connection and associated vault piping need to be replaced with new reliable components. Including disconnecting and flanging off an existing unused supply line.

The piping is located within Navajo Dam at 1281 Hwy 511 Navajo Dam NM, 87419.

2. OBJECTIVE

The objective of this PWS is to remove and replace existing piping and components to repair the domestic water line.

Remove the following existing piping elements and replace new piping and components:

1) 3-inch pipe and associated valves that connect a 6-inch penstock gate bypass line to a domestic water line.

2) a leaking domestic water line connection between steel and plastic piping, and the associated steel piping and valve, which are in a vault near the penstock tunnel access structure.

Remove the following existing piping elements:

3) an unused alternate water supply line in the vault.

3. SCOPE & SERVICES TO BE PERFORMED

The scope of this effort includes all labor, materials, and equipment to be provided by the selected

Contractor to:

1) Replace the following system components, in-kind, at the bypass connection.

a. 3-inch Threaded Gate Valve

b. Y-Strainer (3-inch) and associated Gate Valve (1 ¼-inch)

c. 3-inch Pipe – approximately 3-feet

d. 3-inch 90-degree Elbow

e. 3-inch flanges and hardware

2) Replace the piping and components in the buried vault.

a. 3-inch Flanged Gate Valve

b. Piping – approximately 3-feet of steel and/or PVC piping as needed.

c. Transition Connection – a connection to transition between the steel piping and PVC piping.

d. 3-inch flanges and hardware

e. Disconnect Alternate Line – Disconnect and remove the alternate supply piping in the vault and close the alternate piping with a suitable flange.

3) Remove existing equipment, piping, valves, and components as needed to complete the work.

4. REQUIREMENTS

All components will be composed of galvanized steel with flanged or threaded connections able to withstand a minimum of 170 psi pressure. All required bolts and connectors will be supplied by the

Contractor. See Section 6, Material Requirements, for more information.

Component sizing will be confirmed by the Contractor following review of the site conditions and project needs with Reclamation staff prior to preparing submittals and/or shop drawings. Submittals will be required for approval by Reclamation for all system components listed in Section 3 and shall include, at a minimum, the Manufacturers’ names and product designations and specified product standards.

Removal and disposal of the existing bolts, equipment, and system components will be the responsibility of the Contractor. Determining where to disconnect and flange off the alternate line piping in the buried vault will be coordinated with Reclamation.

Adjust the pressure reducing valve to reduce the incoming pressure to a downstream pressure of 90 pounds-per-square-inch (psi).

Locate the 3-inch flanged gate valve, in the buried vault, within the new piping layout so that it has at least 12-inches of clearance from the upstream and downstream vault walls. Install supports, such as floor mount flange supports, to support the entire weight of the gate valve. The support, or supports, will transfer the valve weight load to the concrete floor of the vault with an anchored base plate.

Leak testing to industry standards including a minimum of two (2) hours of leak monitoring at full pressure will be required. The installation is required to have zero leaks. Any repairs or modifications to the new components found to be leaking will be the Contractor’s responsibility and at the Contractor’s cost. Following any repairs, a new test must be conducted and passed.

All work performed for this project shall be done in accordance with applicable federal, state, and local safety codes. The Contractor shall furnish a Safety Plan to Reclamation prior to work commencement and to employees assigned to task work. The Safety Plan, at a minimum, shall include requirements for use of protective clothing and a summary of safety and emergency procedures to be used in the event of an injury or other emergency. A good source of reference is Reclamation’s Safety and Health Standards.

5. SUPPORTING INFORMATION

1) Period of Performance: October 1st, 2026 through November 30st, 2026. The intent is for repairs to be completed as soon as possible with a window provided for material procurement and staff scheduling.

2) Place of Performance: Work will occur at Navajo Dam, located at 1281 Hwy 511 Navajo Dam

NM, 87419. The work site is within a fenced and locked area that will require a Reclamation escort.

3) On-site work hours: The site will be available to Contractor personnel for work Monday through

Friday, 7:30am to 3:30pm.

4) Contractor Use Area: A portion of the parking area just outside of the penstock tunnel may be utilized by the Contractor for mobilization, demobilization, storage of materials and equipment and performing work. The portion and location of the parking lot utilized shall be coordinated with Reclamation staff prior to beginning work and activities shall not interfere with Government activities. The Contractor will assume full responsibility for protection and safekeeping of products stored on premises; however, the site is located within a fenced and locked area.

5) The Contractor shall supply restrooms for their staff’s use during the work.

6) The pressure in the domestic water line in the vault is believed to be approximately 90 psi.

7) The clear opening diameter of the manhole access into the buried vault is approximately 23-inches.

6. MATERIAL REQUIREMENTS

All materials are to have a minimum pressure rating of 170 psi at a water temperature of 100 degrees

Fahrenheit. Contractor to supply all nuts, studs, bolts, gaskets for flanged joints that are suitable for the installation and in accordance with ASME B16.5. Requirements for each system component are as follows:

a) 3-inch Class 125 Flanged Gate Valve

i. ASTM A126 Class B, cast iron valve body

ii. Class 125 flanges

iii. Manually operated

iv. Bonneted

v. Nonrising stem

b) 3-inch Class 125 Threaded Gate Valve

i. ASTM A126 Class B, cast iron

ii. Manually operated

iii. Bonneted

iv. Nonrising stem

c) 3-inch Class 125 Y Strainer and associated Ball Valve

i. ASTM A126 Grade B, cast iron strainer body

a) Stainless steel perforated screen

b) NPT threaded blow off plug

c) Ball Valve

i. MSS SP-110

ii. Steel or brass body

iii. Ball valve diameter to match strainer threaded blow off

iv. Full or regular port

v. Manually operated

vi. Threaded ends

vii. Threaded pipe nipple to connect ball valve to strainer blow off, diameter to match strainer threaded blow off.

a) ASTM A53

b) Std. wall

c) NPT Threading

d) 3-inch Threaded Pipe and Nipples

i. ASTM A53

j. Steel, galvanized

k. Std. wall

l. NPT threading

e) 3-inch Threaded 90-degree Elbow

i. Class 150

ii. Steel, galvanized

iii. NPT threading

f) Threaded Flanges

i. Dimensions and pressure ratings to match mating flange

g) 3-inch Class 150 Pressure Reducing Valve

i. ASTM A216-WCB cast steel or ASTM A536 cast iron valve body

d) Class 150 flanges

e) Pilot controlled, with pilot system strainer

f) Suitable for an inlet pressure of approximately 170 psi

g) Creates a steady outlet pressure.

i. Outlet pressure is adjustable from 60 to 120 psi

h) 4-inch PVC Piping

i. AWWA C900

ii. Pressure class: at least 150 psi (DR 27.5)

i) Gate Valve Support

i. Galvanized steel

ii. Flange plate base for anchoring to vault floor

7. WORK EXECUTION

a) Preparation: The gate valves on the penstock bypass pipe will be closed by Reclamation staff to allow for the work to occur “in the dry” the morning of the first day of work. The system will not be shutdown until all materials to complete the scope are available onsite to minimize down time.

Work should be scheduled early in the week to allow time for installation and testing without an outage required over a weekend.

b) Existing Component Removal: The contractor will be responsible for removal and disposal of all existing components. Care should be taken not to damage the existing equipment and connections that are to remain in place.

c) Installation: The Contractor will be responsible for installation of all new system components.

The system shall be ready for testing within 96 hours of initial shutdown.

d) System Testing: Following installation completion, gate valves on the penstock bypass pipe will be opened by Reclamation staff. The system will be tested for leaks at full pressure for a minimum of 2 hours. The installation is required to have zero leaks. Any repairs or modifications to the new components found to be leaking will be the Contractor’s responsibility and at the

Contractor’s cost. Following any repairs, a new test must be conducted and passed.

e) Site Restoration: Site cleanup to restore the work and staging areas to original or better condition will be the responsibility of the Contractor.

8. PERFORMANCE REQUIREMENTS & QUALITY

The Contractor’s performance will be reviewed by Reclamation staff using the attached Quality

Assurance Surveillance Plan.

Standards for and surveillance methods of the Contractor’s performance in the Quality Assurance

Surveillance Plan are also shown in the table below:

No. Description Timeframe Performance

Indicator

Acceptable

Quality

Levels (AQL)

Surveillance

Method

Provide Submittals:

Provide COR with submittals required by the

Performance Work

Statement

Within 10 days of contract award

Specifications

Submitted

Cut sheet and/or shop drawing

Submittals must provide enough detail for COR to determine if specifications are being met.

Document when performance exceeds the standard. If performance is below standard for a given period, require contractor to re-perform service at no additional cost to the government.

Notification and Work

Hours: Contractor must work specified hours and follow notification requirements.

Extent of contract

Communication with

Reclamation

Visitor logs and work reports Same as above

Complete Installations:

The contractor will install all required system components

Within 48 hours of system shutdown

Requirements and timeframe achieved

Leak testing passed per PWS Same as above

Use of Facility: Contractor must return the facility, including staging areas, to its original or better condition.

Extent of contract

Facility walkthrough with

Reclamation prior to leaving site

Facility left in its original or better condition

Same as above

Development of Safety

Plan: The Safety Plan, at a minimum, will include

Prior to site work

Report submitted Review plan Same as above

No. Description Timeframe Performance

Indicator

Acceptable

Quality

Levels (AQL)

Surveillance

Method requirements for use of protective clothing such as protective eye wear and footwear, gloves, etc. as well as a summary of safety and emergency procedures to be used in the event of an injury

9. DOCUMENTATION

The Contractor will be required to provide design documentation that demonstrates that the criteria in the

PWS have been met. Written plans and specifications, including cut sheets, sketches, job sheets, and drawings, shall meet standard criteria and comply with applicable laws and regulations.

Item

No.

Description Content Format Medium Delivery

Manufacturer’s

Product Data

PWS Section

3, 4, 6 PDF Electronic report

Delivered to COR one week before ordering

2 Shop Drawings PWS Section

3, 4, 6 PDF Electronic drawing

Delivered to COR one week before ordering

3 Safety Plan PWS Section

PDF or

Microsoft

Word

Electronic report 1 copy delivered to COR prior to construction start

10. GOVERNMENT FURNISHED MATERIALS

Not applicable.

11. REGULATIONS & POLICIES

Reclamation policies and procedures recognize that protecting the environment, ensuring safety, conducting proper maintenance, and efficient operations are all compatible goals. Such policies and procedures ensure that Reclamation facilities are operated and maintained in the best interest of the public.

The Contractor must comply with all applicable Federal, state and local laws. Reclamation staff will periodically make field site visits to review the progress made in the completion of tasks and provide instructions/comments on an as-needed basis and will review the safety practices of the Contractor.

12. RECLAMATION CONTACTS

a) Assigned CO: Tyler Spencer, Telephone: 801-524-3653, Email: tyler_spencer@ios.doi.gov

b) Assigned COR: Nathan Nakamoto, Telephone: 303-349-0591, Email: nnakamoto@usbr.gov

c) Technical Representative: Nathan Nakamoto, Telephone: 303-349-0591, Email:

nnakamoto@usbr.gov

d) Navajo Dam Facility Contact: Jerry Tensfield, Telephone: 505-632-3115, Email:

jtensfield@usbr.gov

13. FIGURES

Figure 1. View of bypass piping and 3-inch water line

Figure 2. View of 3-inch threaded gate valve to be replaced

Figure 3. View of 3-inch flanged strainer and threaded piping to be replaced

Figure 4. View of 3-inch flanged pressure reducing valve and threaded piping to be replaced

Figure 5. View of piping in the buried vault

Figure 6. View of piping in the buried vault

Remove and replace piping and valve.

Remove and flange off alternate line piping

Figure 7. View of existing 3-inch flanged valve and upstream wall penetration

Figure 8. View of steel to PVC connection and downstream wall penetration

Flanged connection with HDPE pipe

Threaded joint

4-inch PVC

Bell and spigot joint with fiberglass wrap repair

Figure 9. View of vault and access from ground level