B08__A22_PreBid_Site_Visit_Overview_and_Field_Review.pdf

CRIP MAIN

CANAL CHECK

STRUCTURES

Solicitation: 140A1626R0005

Pre-Bid Meeting

01/28/2026

These slides summarize the pre-bid meeting discussions for the subject solicitation.

AGENDA

8:30 to 10:00 Project Overview by BIA/DOWL

Introductions

Administrative Procedures (by BIA CO)

Project Overview (by DOWL)

General Q&A

10:00 to 1:00 On-site Field Review

MC185 and MC270 sites (~60 min. total)

MC420 site (~60 min. total)

Lat. 73-36 site (~60 min. total)

1:00 to 2:00 End of Meeting and Additional Q&A

Jeff Olsson (DOWL) briefly outlined the agenda for the pre-proposal meeting. Slides 1 through 19 of this presentation were presented during the “project overview” portion of the meeting. Subsequent slides were briefly discussed on-site at each of the project sites.

TRIBAL EMPLOYMENT RIGHTS OFFICE (TERO)

TERO Director Theo De La Rosa Email: theo.delarosa@crit-nsn.gov Phone: (928) 669-1380 Alt.: (928) 669-1390

Address: 26600 Mohave Road Parker, AZ 85344 https://crit-nsn.gov/crittero/

The TERO Director was not in attendance at the meeting. Interested parties are encouraged to contact the TERO Office for more information on requirements that apply to this project and to individual contractors/subcontractors.

ADMINISTRATIVE PROCEDURES &

BIDDING PROCESS

Sections L and M present the bid/proposal procedures

Bid addenda process

Procedures for questions

• Verbal Q&A is non-binding

• Use the Q&A form in the solicitation

• BIA responses shortly after due date(s)

Solicitation deadline indicated on SAM.gov

Disclaimers

• Dry-up

• Schedules

BIA presented this brief overview of the administrative procedures specific to this solicitation.

• All questions MUST be submitted in writing and on the Q&A form. All verbal Q&A is non-binding.

• Prospective bidders should review Sections L and M in particular for more detailed information on project-specification proposal information and how BIA will review these proposals.

• Anyone can submit questions through the proper channels and on the proper form.

• The word “dry-up” is used to refer to the annual period each January during which BIA draws down the canals for maintenance. “Dry” is perhaps a misnomer in that most of the canals are not truly dry during this period; there is no active flow, but some retain standing water and saturated soil conditions.

• Schedules noted herein are informational, intended to convey the project team’s expectations regarding how the work would/could be sequenced and to illustrate sequencing the Engineer expects would be used to complete the work.

ADMINISTRATIVE PROCEDURES &

BIDDING PROCESS

This is a rebid of a Spring 2025 project under the solicitation number 140A1624R0015

The previous solicitation was an Indian Small Business Economic Enterprise (ISBEE) Set-Aside

Not awarded due to pricing exceeding the available funding

Rebidding as an open solicitation

Earlier Q&A is still available on SAM.gov

Estimated magnitude construction cost for the project is provided on SAM.gov

This project is a rebid of the solicitation that bid last fall. This slide summarizes reasons the project was not awarded and is being rebid.

PROJECT OVERVIEW

CLIN 1: MC 185 & MC 270 Check Rehabilitation

CLIN 2: MC 420 Radial Gate Design

CLIN 3: MC 420 Check Replacement

CLIN 4: MC 420 Electrical Transmission and Distribution Modifications

CLIN 5: Lat. 73-36 Check 1 Replacement

Main Canal Check 185

Main Canal Check 270

Lateral 73-36 Check 1

Main Canal Check 420

This slide shows the four projects that have been bundled together by BIA for bidding and construction purposes:

• MC185 and MC270 – These sites will be rehabilitated on their current footprint and as such no permanent ROW modifications are required. CRIT approved a resolution in

2023 granting a temporary construction easement (TCE) to facilitate construction of these features.

• MC420 – This site is in worse condition than the two upstream sites and has the least remaining service life; replacement (i.e., not rehabilitation) is required for this site.

Replacement is not feasible within the current footprint, and ROW modifications are required to facilitate construction on a new alignment adjacent the existing. ROW actions are complete.

• Lateral 73-36 Check 1 – This is a re-bid of an earlier solicitation by BIA. This had previously been considered an emergency repair. No permanent ROW needs at this site. A TCE was previously approved by CRIT through a Tribal resolution.

PRICING SCHEDULE STRUCTURE

Base Bid CLIN 5: Lat. 73-36 Check 1 Replacement

Bid Additive 1

CLIN 2: MC 420 Radial Gate Design

CLIN 3: MC 420 Check Replacement

CLIN 4: MC 420 Electrical Transmission and Distribution Modifications

Bid Additive 2 CLIN 1: MC 185 & MC 270 Check

Rehabilitation

Main Canal Check 185

Main Canal Check 270

Lateral 73-36 Check 1

Main Canal Check 420

• BIA would like to award the base bid and bid additives. The bid additives are included to allow BIA flexibility in awarding the contract.

• CLIN 2 includes the design of the MC420 radial gate. The fabrication and installation of this gate is included under CLIN 3.

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Existing Conditions Proposed Conditions

New Headworks

New Long-Crested Weir Check

Bank Improvements

Existing Check Structure with Integral Headworks

Cast-in-place Check

Precast Headgate

• This structure has been undermined several times and is in very poor condition.

• A new structure will be built slightly downstream of the current structure and a new headworks.

• A temporary check and bypass will be utilized to facilitate construction.

• We expect the bypass will be constructed in 2026 and activated in October during a period of low flow (CRIT/BIA may be able to accommodate a brief shutdown for the contractor to activate the bypass).

• The Lat. 73-36 check has a primary two-week dry-up period in Jan.

• A secondary one-week dry-up period occurs in Feb.

• We expect the headgate structure will be pre-cast and installed during the Jan. dry-up.

• The successful bidder will design and utilize their preferred cofferdam system.

• The plans include a design for the temporary check.

EXISTING FACILITY – CHECK 1

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Construct Temp. Check & Bypass Channel

Construct Permanent Check Structure

Construct Headworks and Resume Irrigation

1 2 3

New headworks constructed during dry-up

Activate bypass during October drawdown

The work sequence depicted on this slide differs slightly than that shown in the plans due to the changing schedule associated with rebidding. The Engineer believes this expected work sequence is a reasonable approach with a high likelihood of success. The Contractor may propose an alternate work sequence. Certain aspects of the work (e.g., cofferdam type, method, and timing) are the responsibility of the Contractor. Some aspects of the illustration were based on an alternate construction sequence, but the overall workflow is similar. The general expected workflow is:

• Phase 1: Construct the temporary bypass and check. Sheet pile walls isolates the construction of a bypass channel parallel to the 73-36 lateral. A bank raise upstream of the new check will be required. Some of the sheets are temporary and are intended to be removed when activating the bypass channel.

• Phase 2: The bypass is expected to be activated during the October 2026 drawdown in Sublateral 73-36. Water would then flow in the bypass while the new check is being constructed.

• The existing check and headworks demolition would also be completed at this time. Water would then flow in the bypass while the new check is being constructed.

• Phase 3: During the January 2026 dry-up (perhaps also including work during the February dry-up), the headworks would be replaced and the permanent check would be activated.

BASE BID – CLIN5

LAT. 73-36 KEY TAKEAWAYS

Activating bypass (Cofferdamming and CRIP Coordination)

Foundation dewatering (Isolate Seepage and Active Dewatering)

Demolish existing structure and install headworks (During 2-wk Period)

Bidders are encouraged to give significant attention to these items.

BID ADD. 1 – CLIN 2,3,&4

MC420 WORK RESTRICTIONS SUMMARY

Irrigation Restrictions and Dry-Up Schedule

Environmental Restrictions

Electrical Outage Window

Construction Limits

Construction Limits

Earthwork Borrow Area

Protect Culturally Significant Rock Outcrop

Protect Concrete Wasteway

• This site requires ROW modifications. CRIT and BIA have both approved the ROW authorizations for the project.

• Work restrictions are included in the specs.

• Clearing and grubbing has to be completed during a specific time-frame to avoid the bird breeding season – refer to the environmental specifications.

• There is an electrical outage window.

• The new electrical transmission lines can be activated during this window with a brief outage or activated “hot”.

• Preliminary pole foundations have been designed. Final foundation designs will be based on the Contractor’s shop drawings and pole reactions provided through submittals. This may necessitate the need for a foundation size adjustment. Refer to the pricing schedule which shows how size adjustments will be handled.

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Transmission Line

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Realignment

Canal Realignment

• The final cut/fill for the project is expected to be a net balance; however, not every construction phase will balance. For example, we expect there will be a shortage during Phase 1 construction; to accommodate this, the drawings identify a temporary borrow area. Final excavations during Phase 3 would then be needed to restore this borrow area to pre-disturbance conditions; however, note that the Phase 3 available fill is on the opposite side of the canal from the temporary borrow area.

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Construct New Canal Alignment and Check Structure

Tie Into New Alignment During Dry-Up

Resume Irrigation and Remove Existing Canal1 2 3

• The transmission line will need to be realigned prior to canal work.

• Canal realignment will include the three phases detailed above.

BID ADD. 2 – CLIN1

MC185

KEY WORK ELEMENTS

Radial Gate Replacement

Radial Gate Hoist Equipment

Owner-Furnished Lateral Gates

Selective Demolition

Concrete and Steel Repairs

Walkways and Handrails

Instrumentation and Control Building

Safety Features, Fencing, Signage

Access Road Improvements

Stop Logs

• CRIP has a two-week (generally 14 calendar days) dry-up period in January of each year for routine O&M. Various activities (e.g., final gate measurements) will need to be performed by the successful proposer during this dry-up period. The canal will likely take a few days for the water level to draw down.

• DOWL has identified activities in the plans that could take place prior to the dry-up period. However, the called-out activities may not be inclusive and may be adjusted based on Contractor preference. It will be important to the successful performance of the contract to do as much as possible outside of the very limited dry-up window.

• Unless indicated otherwise through addendum, bidders should assume a two-week dry-up period for bidding purposes; however, BIA and CRIT are reviewing the potential for an extended dry-up to better accommodate this project. Bidders are encouraged to submit a question if they feel completion within the two-week dry-up is infeasible.

• The lateral gates at MC185 are owner-furnished and the actuators require modification (e.g., a motor swap); however, the successful bidder is not obligated to use the owner-furnished equipment.

• Field measurements of the radial gate and associated anchorage (which will be reused) will need to be taken by the successful proposer during the January dry-up period (expected Jan. 2027).

• The structure will need to be pressure-washed during the dry-up period to facilitate crack mapping.

• The successful bidder would need to coordinate with the CRIT building inspector prior to bringing the control building online.

• The radial gates are electrically actuated and automated. Multi-turn style actuators are not allowed for any of the radial gate hoist equipment of the project.

• The lateral slide gates are electrically actuated.

• A set of guides/rails will be installed at each MC site with one set of stop logs that can be used at all the sites. The bulkhead elements could be installed via crane if/when they are needed; these are not part of the

BIA’s typical/annual O&M.

BID ADD. 2– CLIN1

MC270

KEY WORK ELEMENTS

Radial Gate Replacement

Radial Gate Hoist Equipment

Contractor-Furnished Lateral Gates

Selective Demolition

Concrete and Steel Repairs

Walkways and Handrails

Instrumentation and Control Building

Safety Features, Fencing, Signage

Access Road Improvements

Stop Logs Shared With MC 185

Expected Work Sequence Shared with MC 185

• The elements of the MC270 site are very similar to the MC185 site. The main difference between the sites is that the lateral gates for MC270 are CONTRACTOR-furnished.

• Field measurements of the structure will need to be taken during the 2027 dry-up period for the gate design.

• The existing anchorage will be re-used.

• There is flexibility if the successful bidder wants to re-use the existing anchorage or cut it flush and extend the rods – refer to the drawings.

• Although Contractor’s detailed measurements are to be used for shop drawing development and final design, sufficient information is provided in the drawings for bidding purposes. The drawings document the overall gate bay width and require post-installed side rubbing plates and sill plate, providing suitable construction tolerance for fit-up.

• MC185 and MC270 will be completed during the same two-week dry-up period.

BID ADD. 2 – CLIN1

MC185/270 KEY CONSIDERATIONS

Annual January Main Canal dry-up (typically 2 weeks)

Contractor required to collect field measurements (expected during the January 2027 dry-up)

Radial gate: assemble and test hoist as a single assembly in shop, deliver to site prior to dry-up

Contractor should do as much as possible prior to irrigation dry-up

• Radial gate field measurements must be taken and submitted.

• The specs outline the requirements for substantial completion and commissioning at the close of the dry-up period. The gates need to be able to be operated manually and ready for programming.

• The Owner will be providing programming, which is expected to occur immediately after the dry-up period.

EXPECTED PROJECT SCHEDULE SUMMARY

202820272026

Q2Q1Q4Q3Q2Q1Q4Q3Q2Q1Event

Awards and Contracting

Lat. 73-36 Bypass and Check Construction

Lat 73-36 Headgate Replacement

MC 420 Electrical Transmission and Distribution

MC 420 Canal Realignment and New Check

MC 420 Gate Commissioning and Final Site Work

MC 185/270 Site Prep Work

MC 185/270 Radial Gate Replacement

MC 185/270 Final Site Work

Jan. 2027 MC Dry-up

Jan. 2028 MC Dry-up

Gate Measurements

Temp Check & Bypass Perm. Check

Gate Shop Dwgs. & Fab.

Pole Shop Dwgs. & Fab.

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This schedule illustrated the general relationships between key activities, showing how we expect the work would be completed. The successful proposer may have alternate ideas; however, to be appropriate, any alternate work sequences or schedules need to consider the work restrictions (e.g., vegetation clearing windows, electrical outage periods, irrigation operations, and scheduled annual dry-up periods).

RECOMMENDED CONSTRUCTION

SCHEDULE MILESTONES

Base Bid o CLIN 5 - Lateral 73-36 o Temporary Bypass/Check ready to activate at the end of September 2026 o Headgate Substantial Completion by the end of the January 2027 MC dry-up period o Lat. 73-36 Check 1 Substantial Completion shortly after the January 2027 MC dry-up period

Bid Additive 1 o CLIN 3 - MC420 Check Replacement o Complete Phase 1 before the January 2028 MC dry-up o Construct Phase 2 during the January 2028 MC dry-up o Gate functional at the end of the January 2028 MC dry-up period o CLIN 4 - MC420 Electrical Transmission and Distribution Modifications o Perform clearing and grubbing activities and any electrical outages within the defined work restrictions o Elec. Transmission Realignment Substantial Completion: Preferred at the end of the electrical outage window (2/25/2027)

Bid Additive 2 o CLIN 1 - MC185 and MC270 Check Rehabilitation o Perform Contractor’s on-site measurements during the January 2027 dry-up period o Gates functional at the end of the January 2028 MC dry-up period o February 12, 2028: MC185 and MC270 Check Rehabilitation Substantial Completion

• The Engineer emphasized that these are “recommended” dates not “required” dates; prospective bidders may deviate from these dates if they feel it is beneficial to the overall project. However, if deviating from the recommended dates, bidders should outline the reasons for the deviations in their proposal narrative.

REMINDERS

Review Solicitation Sections L and M

Schedules shown in these slides are for illustration purposes only

Verbal Q&A is non-binding

All questions must be submitted in writing to the COR

Leaving from the parking lot to MC 185 Check site

• If you get separated from the group call:

Jeff Olsson

406-202-8436 (mobile)

Field logistics & Safety Reminder

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Beginning of slides covered on-site at the MC185 site. Not all of these slides were reviewed in detail during the field review.

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Radial Gate

Weir Wall

Lateral 19R Gate

Lateral 19L Gate

Overflow Wasteway

MC 185

SITE OVERVIEW

LATERAL 19L

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MC 185 WORK RESTRICTIONS

Irrigation Restrictions and Dry-Up Schedule

Construction Limits

Environmental Restrictions

Construction Limits

Protect Pedestrian Bridge

Protect Concrete Wasteway

• The construction limits show the extent of the TCE approved by CRIT for the project. Work outside of these areas is not allowed.

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MC 185 STRUCTURE MODIFICATIONS

Selective demolition

Structural platforms, walkways, railings

Concrete restoration

Concrete weir wall

Stainless steel stoplogs and bulkhead slots

Brief overview of key structure modifications.

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MC 185 RADIAL GATE REPLACEMENT

Gate Hoist Assembly

1. Hoist base

2. Motor and gearing

3. Control panel

4. Cross shaft and wire rope drums

5. Grating and railings

Owner Witness Testing at fabrication shop

Erecting Engineer

Trunnion pins to fit existing anchor rods

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MC 185 LATERAL GATE REPLACEMENTS

Owner-furnished stainless steel slide gates

Lateral 19L Headgate Lateral 19R Headgate

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Safety Cable & Ladders

Bollards

Fencing, Signage, & Gates

Road Resurfacing and Widening

All existing fences will be removed and replaced in their entirety.

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Staff Gages

Water Level Sensors

Stilling Wells

New Control Building

Gate Instrumentation

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MC 185 ANTICIPATED WORK SEQUENCE

Phase 1: Prior to Main Canal Drawdown

Field Measurements (Jan. ‘27)

Selective Demolition

Radial Gate Procurement

Sensor Mounting and Installation

Control Building Installation

Staging and Preparation for Phase 2

All other work that can plausibly be completed before irrigation drawdown

Phase 2: During Main Canal Drawdown

Dewatering

Crack Mapping

Selective Demolition

Radial Gate and Lateral Gate Installation and Testing

Electrical Infrastructure

Structural Upgrades and Repairs

Safety Feature Installation

Concrete Weir Wall

Phase 3: After Main Canal Drawdown

Final Testing and Commissioning

Access Road Rehabilitation

Programming (by Owner) and Systems Integration

All Remaining Tasks

Site Rehabilitation and Demobilization

1 2 3

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MC 185 ANTICIPATED TIMELINE

20282027

Q2Q1Q4Q3Q2Q1Event

Field Measurements

Radial Gate Procurement and Fabrication

Site Preparatory Work

Gate Installation and Structure Modifications

Gate Commissioning

Final Site Work and Cleanup

Planned two-week irrigation shutoff in the CRIP Main Canal January 2027 and January 2028

Jan. 2027 Dry-up

Jan. 2028 Dry-up

Phase 1: Prior to Main Canal Drawdown

Phase 2: During Main Canal Drawdown

Phase 3: After Main Canal Drawdown

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RADIAL GATE PROCUREMENT FLOWCHART

Contractor Field Measurements (35 22 46-9)

Radial Gate Fabrication

Radial Gate Designer and Manufacturer Qualifications (35 22 46-1)

Radial Gate Approval Drawings and Data (35 22 46-2)

Wire Rope Prestressing Test Results (35 22 46-3)

Radial Gate Factory Acceptance Test Results (35 22 46-4)

Owner-witnessed Factory Acceptance Test Results (35 22 46-5)

Gate Handling and Installation Plan (35 22 46-6)

O&M Manuals and Post-Installation Documents (35 22 46-7 and 35 22 46-8)

Gate Hoist Assembly Fabrication

Ship Components to Site Gate Installation

Gate Commissioning and Testing

Training

Hoist Control Panel Product Data and Wiring Diagrams (40 63 13-1)

Hoist Control Panel Unwitnessed Factory Acceptance Test Results (40 63 13-2)

Hoist Control Panel Fabrication

Ship Panel to Hoist Assembly Shop

Owner’s Inspection of Materials

Notice of Award

Key Milestones

Radial Gate Submittals

Hoist Control Panel Submittals

LEGEND

FABRICATION SHOP(S)

PROJECT SITE

PANEL FACTORY

This flowchart illustrates project requirements. Emphasis on Contractor’s field measurements and Owner’s approval (e.g., gate hoist testing and gate inspection) of equipment.

Multi-turn actuators are not allowed—refer to the specific motor, gearing, etc. equipment indicated in the specifications. Programming will be by Owner after installation.

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MC 185 KEY TAKEAWAYS

Radial gate fabrication and testing requirements

Identify elements of work that can be completed prior to irrigation dry-up

Incorporating owner- and contractor-furnished equipment

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Beginning of slides covered on-site at the MC270 site. Not all of these slides were reviewed in detail during the on-site meeting.

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Radial Gate

Spillway

Lateral 27R Gate

Lateral 27L Gate

Overflow Wasteway

MC 270

SITE OVERVIEW

LATERAL 27R LATERAL 27L

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MC 270 KEY

WORK ELEMENTS

Radial Gate Replacement

Selective Demolition

Concrete and Steel Repairs

Walkways and Handrails

Contractor-Furnished Lateral Gates

Instrumentation, and Control Building

Safety Features, Fencing, Signage

Access Road Improvements

Stop Logs Shared With MC 185

Expected Work Sequence Shared with MC 185

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Beginning of slides covered on-site at the MC420 site. Not all of these slides were reviewed in detail during the on-site meeting.

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Existing MC420 Check Structure

Existing Transmission Line

New Canal Alignment

MC420 Replacement Structure

Temporary Borrow Area

MC 420 SITE OVERVIEW

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MC 420 WORK RESTRICTIONS

Dry-Up Schedule

Construction Limits

Environmental Restrictions

Construction Limits

Earthwork Borrow Area

Protect Concrete Wasteway

Protect Culturally Significant Rock Outcrop

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Construct New Canal Alignment and Check Structure (2027)

Tie Into New Alignment During 2028 Dry-Up

Resume Irrigation and Remove Existing Canal1 2 3

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MC 420 EXPECTED TIMELINE

202820272026

Q2Q1Q4Q3Q2Q1Q4Q3Q2Q1Event

Work Restrictions: Allowed Vegetative Clearing Window(s)

Work Restrictions: Allowed Transmission Outage Window

Electrical Pole Procurement and Fabrication

Construct Transmission and Distribution Revisions

Radial Gate Procurement and Fabrication

Construct Canal Realignment and New Check

Tie in Connection and Gate Commissioning

Final Site Work and Cleanup

Jan. 2028 Dry-up

CLIN 4

CLIN 2 and 3

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Concrete Canal Lining

Relocated Drain Ditch

New MC 420 Check Structure and Security Fencing

Canal Safety Features

Buried Drain Pipe

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MC 420: DRAIN REALIGNMENT

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MC 420 RADIAL GATE

Individual Contract Line Item

Gate Hoist Assembly

Owner-Witness Hoist Assembly Testing at Fabrication Shop

Owner’s Inspection of Radial Gate Before Shipping

Erecting Engineer and Commissioning

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Sensors and electrical system for gate controls and flow measurement

Additional instrumentation and controls at Lateral 42L

Electrical system for gate controls not associated with transmission realignment

PLC programming by Owner

MC 420 CONTROLS AND

INSTRUMENTATION

Control Building

Hoist Control Panel

Existing Electrical Distribution Pole

Stilling Wells

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MC 420 ELECTRICAL TRANSMISSION REALIGNMENT

Alignment

Work Sequencing

Foundation Payment Procedures

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MC 420 KEY TAKEAWAYS

New Canal Alignment Construction

Radial Gate Commissioning Before Phase 3

Electrical Transmission Realignment

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Beginning of slides covered on-site at the Lat. 73-36 site. Not all of these slides were reviewed in detail during the on-site meeting.

• Project Purpose: replacing infrastructure while minimizing interruptions in irrigation service.

• The new check will be an updated version of the existing long-crested weir, which maintains a relatively consistent upstream water level over a wide range of flow rates.

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73-36 Check 1

73-36-7 Headworks

Temporary Bypass

Check 1 Replacement

LAT. 73-36 SITE

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LAT. 73-36 BACKGROUND INFORMATION

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LAT. 73-36 WORK RESTRICTIONS

Dry-Up Schedule

Construction Limits

Environmental Restrictions

Construction Limits

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EXISTING FACILITY – CHECK 1

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Construct Temp. Check & Bypass Channel

Construct Permanent Check Structure

Construct Headworks and Resume Irrigation

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Activate bypass during Lat. 73-36 October drawdown

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LAT. 73-36 EXPECTED TIMELINE

20272026

Q2Q1Q4Q3Q2Q1Event

Construct Temporary Check and Bypass

Fabricate Headgate and Precast Elements

Demolish Existing Check and Install Headgate

Install Cofferdams

Construct Permanent Check Structure

Final Site Grading and Cleanup

Annual two-week irrigation shutoff in Main Canal and Sublateral 73-36 January of each year

Additional one-week Lateral 73 shutdown in February of each year

Limited drawdown / low flow in Sublateral 73-36 early October

Exact shutdown dates vary by year

Jan. 2027 Dry-up

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N

A Typical Section Bypass Channel

A

The borrow source for the temporary bypass fill is the adjacent farm field.

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TEMPORARY CHECK CONSTRUCTION

Sheet Pile 1

Sheet Pile 2

Sheet Pile 3

A brief discussion on the design intent of the temporary check and bypass. Sheet Pile 1 and Sheet Pile 3 will be removed to activate the bypass channel. Sheet pile 2 is the temporary weir wall check that will stay in place for the duration that the bypass is active. The Contractor could propose an alternate sheet pile or bypass channel configuration.

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TEMPORARY CHECK CONSTRUCTION

Sheet Pile 1 Sheet Pile 2

Sheet Pile 2

Sheet Pile 2 manages the upstream water level after the bypass channel is activated. The Contractor can decide how to achieve the specified elevation and length (e.g., overdriving or cutting the sheet pile).

01/28/2026 CRIP MC Checks Field Review. Page 036 of 040

73-36 CHECK 1 CONSTRUCTION

The replacement check is a relatively simple concrete structure, primarily consisting of flatwork and vertical walls with a downstream riprap apron. The Contractor will blend in the canal side slopes with the existing canal.

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D

M O

E X

IS

T

IN

G

C H

E C

K

A N

D C

O N

S T

R U

C T

N E

W H

E A

D W

O R

K S

An expected excavation plan is shown on the left and the final grading plan is shown on the right. During the 2-week dry-up, the Contractor will demolish the existing structure and install the pipe, precast headwall, and precast outlet wall. The actual excavation approach will be the Contractor’s decision. Implicit to the design is the idea that the structure can be demolished and the new facility installed during the 2-week drawdown. Bidders are encouraged to review this sequence carefully when preparing their bids.

01/28/2026 CRIP MC Checks Field Review. Page 038 of 040

73-36-7 HEADWORKS CONSTRUCTION

Precast Headworks Fabricated in Three Pieces

B C

A

Embedded Wall Thimble

To improve constructability and allow for installation during the 2-week drawdown, Owner and Engineer selected a precast arrangement for the headwall. The headwall consists of three main precast elements and a concrete cutoff wall. Bidders attention was called to the wall thimble required for the headgate – this will take some coordination. Early development of gate shop drawings and precast design by Contractor and their suppliers is encouraged. The wall thimble is an embedded element requiring coordinated shop drawings and delivery of the wall thimble to the precast manufacturer. The outlet wall (not pictured in this presentation) is a similar precast element without a wall thimble.

01/28/2026 CRIP MC Checks Field Review. Page 039 of 040

LAT. 73-36 CHECK 1 KEY TAKEAWAYS

Activating bypass (Cofferdamming and CRIP Coordination)

Foundation dewatering (Isolate Seepage and Active Dewatering)

Demolish existing structure and install headworks (During 2-wk Period)

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