Statement of Work MOD/MODE/US Bypass Canal Repairs

Statement of Work

Yuma Area Office – MOD/MODE/US Bypass

Canal Repairs

1. BACKGROUND

The MOD (Main Outlet Drain), MODE (Main Outlet Drain Extension), and US Bypass canals located in Yuma, Arizona convey agricultural drainage flows from farmland to the Cienega de

Santa Clara in Mexico. The Bureau of Reclamation (BOR) is responsible for maintaining the integrity of the existing structures and conveyance system including inlets and diversions, gates, siphons, and linings. The existing system has been in continuous service and is showing signs of concrete deterioration and breakage along the canal at the concrete panels. Maintenance is required to prevent total failure of the canals.

2. LOCATION

Reclamation currently operates and maintains ground water drainage wells and associated water conveyance systems in and around Yuma County. Existing facilities impacted by the project are shown on the Canal Repairs Location Map, Drawing No. 423-303-60177.

3. SITE CONDITIONS

The weather in Yuma County is typical of the desert southwest. Annual highs and lows range from about 120 to 30 degrees Fahrenheit, with intraday variations of up to 50 degrees. Late fall and winter temperatures are generally mild with a slight possibility of freezing during the late winter months. Strong winds and dust storms are possible throughout the year but are generally experienced during the spring months. Thunderstorms and flash floods are also possible during the “monsoon” season which generally occurs during the late summer months (August and

September). Rain is also possible during the late winter and early spring months. Average yearly rainfall for the Yuma area is approximately 3 inches.

Reclamation’s MOD, MODE, and US Bypass canals are accessible from existing public roads and government maintained roads. Overhead and underground utilities may be present near to, parallel, or across existing reclamation drainage facilities. In addition to utilities, there are drainage wells, associated discharge lines, and miscellaneous farm equipment crossings. A portion of the work area is near the US/Mexico international border barrier wall. Coordination is needed to prevent any interference between projects.

4. OBJECTIVE

Establish a contract for the replacement and repair of concrete canal panels for the MOD, MODE, and US Bypass canals as specified in this Statement of Work and associated drawings.

The proposed work will include, but not limited to, saw cutting, demolition, vegetation removal, legal disposal of demolished materials and debris, earthwork for canal lining panels, optional dewatering, optional placement of erosion control-slurry fill behind panels, replacement of concrete lining panels including groove and expansion joints, and crack sealing, and optional additional quantities.

5. WORK COMPONENTS

The work generally comprises the components listed below, with majority of physical works to be executed during the planned outage of the MOD, MODE, and US Bypass canals.

A. Bonding and Insurance.

B. Preparatory work includes submittal documents required in Table 01 33 00A, e.g.

Construction Plan and Safety Program.

C. Mobilization and demobilization.

D. Provide all plans, labor, equipment, and materials necessary for Traffic Control.

E. Remove, haul, and dispose of existing sediment, vegetation, unsuitable materials, concrete, and mechanical components resulting from check structure demolition.

F. Saw cut, remove, and dispose of exiting damaged areas of approximately 3” thick canal lining panels to be replaced with new concrete panels.

G. Furnish, place, and compact, backfill material for the placement of new concrete canal panel lining or repairs.

H. Furnish and place new 3 ½” thick 3,000 PSI concrete for concrete canal lining repairs within canal prism.

I. Furnish and install concrete groove joints.

J. Furnish and install required Type 1 and Type 2 expansion joints.

K. Furnish and apply crack sealant to preserve concrete panels.

L. Conduct testing for backfill material and new concrete for canal panel lining repairs.

M. Provide all labor, equipment, and materials necessary to build cofferdams preventing water from entering the repair areas. Use water pumps as necessary to prevent overtopping. Contractors shall remove and dispose of materials.

N. Optional; design, install, operate, maintain, and monitor water removal facilities where groundwater may oversaturate subgrade materials.

O. Optional; furnish and place erosion control-slurry fill (CLSM) behind panels.

The specific work tasks and locations are included in Section 8 below, Appendix 1, and Drawing

No. 423-303-60177. The contractor is obligated to prepare a Construction Plan, Safety Program, and Traffic Control Plan, and all other submittals required prior to notice to proceed, in advance of field work, as part of ‘B’ above. Work inside the canal may be completed during the canal outage dates, meanwhile preparatory, mobilization, cleanup, and other work outside of the canal may be completed outside of the canal outage dates.

6. PERFORMANCE PERIOD

Performance period for the work will be for 120 calendar days from the date of when the contract award is issued to the Contractor. The MOD, MODE, and US Bypass canal outages are scheduled from April 6, 2026 through April 22, 2026 concurrently. Lockout/tagout will be removed and canals will be reopened April 23, 2026. Typical drawdown period is 2 days before the contractor may start working within the canals.

7. DEFINITIONS

Backfilling: The use of onsite or approved imported soil materials as necessary to bring the canal prism back into compliance and as designated in the Statement of Work. Mechanical compaction and quality control testing are required.

Common Fill: Approved, unclassified soil material with the characteristics required to compact to the soil density specified for the intended use and location.

Demolition: Breaking up and removing designated existing canal concrete lining, joints, structural concrete, and mechanical components. Includes removal of vegetation, stockpiling, and disposal.

Legal Disposal: The hauling/disposal of demolished concrete lining, joint material, structural concrete, mechanical components, construction debris, vegetation, and trash in accordance with state, county, and federal statutes.

Approved Concrete Source: Reclamation approved source of concrete for governmental work.

The only approved concrete suppliers in the Yuma Area are CEMEX and BLT.

Demolition Plan: Detailed written procedures for the removal and disposal of concrete canal lining materials, joint material, and mechanical components.

8. DESCRIPTION OF TASKS

Herein is provided a description of required activities comprising the work. Further details are found in Appendix 1, Drawings, and the Specifications.

Preparatory Work

Subtask 8.1- Assign Key Personnel and Qualified Staff

Project Manager (PM)- Aside from responsibility for planning & execution of the project overall, the Project Manager assigned by Contractor shall serve as focal point to coordinate with

Contracting Officer (CO)/Contracting Officer’s Representative (COR) and other stakeholders.

Onsite Safety Representative- Responsible for general oversight/compliance with OSHA/RSHS and shall remain onsite during construction activities. Alternate Safety Representative’s credentials shall be submitted and approved prior to overseeing onsite construction safety activities.

Construction Superintendent (CS)- Lead CS shall have prior experience for at least two similar projects. CS shall remain onsite during construction activities. Alternate CS’s credentials shall be submitted and approved prior to overseeing onsite construction activities.

The Contractor shall submit a list of key personnel including their responsibilities, training, and certifications as per Table 01 33 00A, to be approved by CO or COR.

Subtask 8.2- Prepare and implement Construction Plan (see below)

Subtask 8.3- Environmental. No specific stormwater or air quality permits are anticipated for this project. Best management practices are to be implemented during construction activities. If a burrowing owl is present in the proposed repair location, the location will be excluded from the contract scope, and the quantities will be deducted accordingly.

Subtask 8.4- Address Stakeholder Concerns. Affected parties include the Government (BOR), City of Yuma Public Works, Yuma County Water Users’ Association, Yuma Parks, Department of Homeland Security, City of San Luis, Bureau of Land Management, and other Federal

Agencies. The work sites are dispersed but include government roads, crossings, and an extensive area adjacent to the international border. The Government is obligated to continue water deliveries to Morellos Dam/Mexico despite diversion of MOD/MODE flows to the

Colorado River during the outage. PM is to prepare for and attend project coordination meetings: assume one with general stakeholders, one prior to outage, one midway through the outage, and one in field at conclusion. PM is to exhibit clear written/verbal communications throughout.

Subtask 8.5- Work Progress Documentation. Contractor designated field personnel shall attend weekly meetings to inform CO of recent progress & preview the upcoming week, discuss ongoing issues, etc. Contractor shall supply photographic records or video recordings/ live feeds to facilitate Government supervision. The contractor shall allow for adequate time in their work schedule for Government representatives to perform progress monitoring/checks periodically.

Such occurrences may not be construed as hindering or interrupting contractor activities or cause for delay claims. Supply to CO up-to-date tonnage of materials delivered to landfill (manifests) as per Specifications.

Subtask 8.6- Prepare/submit deliverables as listed in Table 01 33 00A.

Construction Plan

Prepare and implement Construction Plan. This shall be submitted by Contractor and approved by CO or COR prior to beginning site work; to include Construction Schedule (construction sequence and work schedule), personnel, certifications and evidence of training, equipment list/specs/ working condition (photos if applicable), quality control plan, a record of site baseline conditions in/adjacent to MOD/MODE/US Bypass canals, and demolition plan. The Contractor shall highlight specific methodologies to expedite construction and explain any planning of partial construction during two-week outage of MOD/MODE canals and four-week outage of US

Bypass canal with subsequent completion afterwards. A Safety Program, prepared individually, is to be attached.

The quality control plan will address (but is not limited to) the following: the materials hauled to recycling location(s) and/or landfill, handling of any liquids drained from the MOD/MODE/US

Bypass, site security, preventing damage to existing infrastructure, and general cleanliness during work. The demolition plan shall detail the intended methodology of removing only concrete panels indicated in Appendix 1, while minimizing both the potential for damage to adjacent existing infrastructure and the volume of earthen base disturbed beneath it. A description of stockpiling methods and hauling to disposal locations is also needed.

Government supervision of the project includes only the amount necessary to provide confidence that the technical requirements of the work conform to the established methods, procedures, and regulations outlined in the submitted Construction Plan. Supervision can be continuous or periodic in nature, depending on contract performance. In the event the Contractor fails or refuses to promptly comply with all Federal, State, and Local Safety and Health laws, regulation, codes and standards, the CO may issue and order to suspend all or any part of the work. Failure of the CO or COR to order discontinuance of any or all of the Contractor’s operations shall not relieve the Contractor of the responsibility for the safety of personnel and property.

Mobilization/Demobilization

Thorough preparation is needed to maximize progress during the limited outage. Labor, materials, and equipment must be onsite prior to the designated outage. Personnel shall be oriented in the need to minimize impacts to BOR operations, Border Patrol, or BLM when in those areas.

Subtask 8.7- Assemble personnel, equipment, and materials needed for the work in accordance with the approved Construction Plan. Maintain equipment in continuous working order. The

Contractor may use the MOD/MODE/US Bypass service road on both sides of the canal as a laydown and staging area, providing at least one lane is maintained open. The area must be properly secured from intruders due to safety concerns. A joint visit of Contractor and

Government personnel will be conducted to characterize baseline conditions, to include lists, descriptions, measurements, photos, etc.

Subtask 8.8- Civil Sitework. Erect temporary fencing to secure the Contractor’s equipment laydown areas where needed, to include signage. Make temporary provisions to keep work areas dry. Designate stockpile areas and provide erosion protection methods (silt fence, straw wattle, etc.) as needed. Establish planned routes to accommodate movements of materials within designated work areas and disposal sites and means to prevent mess. Supply porta-potty & refuse bins on site for Contractor personnel. Establish security measures to prevent unauthorized personnel from accessing the site and bring awareness to particular issues such as night work, potential for theft, or vandalism. Various means such as barricades, delineators, fencing should be employed to establish pathways for workers to perform tasks and prevent contact with the public.

Subtask 8.9- Temporary Utilities. Electric, water, lighting, communications. Provide temporary electrical hookup if desired & furnish generators for power loads throughout work areas.

Provide sufficient fuel or power recharge capacity as applies. Provide temporary water supply for work areas and dust control along access routes via tanker transport if needed. Furnish/install external yard lighting to allow 24/7 operations if proposed in Construction Plan. Plan a communication strategy to allow personnel to continuously maintain contact along entire work area; assemble equipment to do so.

Subtask 8.10- Furnish Equipment Onsite. Contractor must submit details of the actual equipment and materials to be used in the work, to be approved prior by COR. Provide equipment for construction, as well as any pumps, hoses, brushes, racks, to maintain dry work areas, clean equipment, and a tidy site.

Subtask 8.11- Cofferdams. Temporary cofferdams may be necessary to complete the concrete repairs under safe working conditions. San Luis water treatment plant must continue draining at the southern border where a weir creates water backup into the US Bypass canal and does not fully drain. If necessary, the contractor is responsible for materials, construction, removal, and disposal of the temporary cofferdam.

Subtask 8.12- Dewatering. Groundwater may oversaturate the subgrade preventing proper soil compaction and canal lining construction. If necessary, dewatering operations shall be conducted in accordance with Specification Section 31 03 33 Removal of Water From Excavation.

Subtask 8.13- Demobilization. Remove all equipment, unused materials, and clean up the site.

Repair any damaged existing infrastructure returning it to baseline condition or better. Remove dirt plugs without damaging any infrastructure and haul with any final debris to landfill.

Subtask 8.14- Protect in place. Infrastructure must be protected in place to prevent damage caused from construction activities. Contractor is responsible for calling Arizona 811 to locate and monitor existing utilities.

Subtask 8.15- Field Verification of Quantities. One day after the US Bypass canal outage has started, the Contractor and Government will meet to field verify the panel repair quantities. In some cases, the damaged panel is narrower, wider, longer, and/or shorter than estimated. If the quantities exceed the awarded price schedule quantities, the Government will provide an updated

Appendix promptly after the measurements, and the Contractor will expedite a price proposal of additional quantities within 2 days of measurements. Only with written approval by the CO, pending modification, may the Contractor proceed with additional quantities. This occurrence will repeat for the MOD/MODE canal outage. Contractor shall track quantities daily and notify the CO or COR of any foreseen overages than the quantities agreed.

Traffic Control

Submitted Traffic Control Plan must meet all federal, state, and local requirements and shall be designed by the Contractor. Traffic Control Plan shall be accepted prior to notice to proceed.

Traffic control must meet the requirements of the Federal Highway Administration, Department of Transportation’s Manual on Uniform Traffic Control Devices, latest edition.

The Contractor shall provide cones, delineators, concrete safety barriers, barricades, flasher lights, danger signals, signs, and other temporary traffic control devices as required to protect work and public safety. Flaggers and guards must also be provided as required to prevent accidents and damage to injury to passing traffic. Work shall not begin along public or private roads until proper traffic control devices for warning, channeling, and protecting motorists are in place with approved traffic plan.

Traffic flow maintenance and construction operations shall be designed to minimize obstructions and inconvenience to the public.

An unobstructed, smooth, and dustless passageway shall be constructed to allow for proper traffic operations through construction operations.

Roads that are closed to traffic shall be protected with effective barricades and warning signs.

Barricades and obstructions shall be illuminated from sunset to sunrise. Traffic control devices shall be removed when no longer in use.

Demolition

The Contractor shall perform all removal and disposal operations in a manner so as not to cause damage to existing structures and/or canal lining to remain in place without negative impact.

Completely remove the indicated concrete panels, expansion joint, damaged mechanical components, and debris at those panels. Transport applicable materials to recycling facilities.

Provide neat saw cuts at the limits of the panel removal as described in Appendix 1. Saw cut along straight lines to full depth. Carefully break out and haul the remainder of the concrete lining. Remove sediment present, existing lining, and debris as required to gain access, or to establish/re-establish the canal prism.

Remove any vegetation present in lining sections to be repaired, and at edge between existing and new lining, including root systems to a depth of 8 inches. Remove vegetation present

(normally clinging) upon ladders to be cleaned or replaced, cutting any embedded roots systems shear with concrete lining surface.

Remove and transport construction debris and rubbish in a manner that will prevent spillage on public roadways, levees, and adjacent areas. Clean up spillage from streets, levees, and adjacent areas if it occurs. Concrete and sediment material may be temporarily stockpiled on one O&M road while work is being conducted in the immediate area. The O&M road that is being used for stockpile shall be closed according to the Traffic Control requirements and allow access for emergency vehicle to work area. One O&M road shall remain open for access during construction. Temporary stockpiles shall be removed and properly disposed of after the work has been completed. Quantities of all excavated material will be measured per ton (dry weight);

estimated per dump truck and/or survey of stockpiles. Assume 1 CY of riprap/concrete/sediment weighs 2 tons.

During demolition and disposal activities, prevent the spread of dust and debris. The contractor will avoid the creation of a nuisance dust in the surrounding area in compliance with state and local statutes. Only sediment and debris within the specified repair areas are to be removed and disposed of by the Contractor, not the entire span of the canals.

Excavation and Fill

The Contract shall contact Arizona 811 prior to excavation.

The Contractor shall protect existing structures, utilities, and other adjacent facilities from damage caused by settlement, lateral movement, undermining, washout, and other hazards created by earthwork operations.

The Contractor shall not operate metal-tracked equipment directly over paved roads or concrete sidewalks. Use ground protection mats or hauling trailer to prevent damage to structures.

The Contractor shall provide erosion control measures to prevent erosion or displacement of soils and discharge of soil-bearing water runoff or airborne dust to adjacent properties.

Stockpile excavated materials acceptable for backfill and fill soil materials, including acceptable borrow materials away from excavations. Stockpile soil materials without intermixing. Place, grade, and shape stockpiles to drain surface water. Cover to prevent wind-blown dust.

Excavate existing material as per Statement of Work (SOW), Appendix 1, and Drawings. Reuse excavated materials that meet the requirements of the SOW. Keep excavations free from standing water and control the soil moisture to mitigate dust. Excavate soil disturbed or weakened by Contractor’s operations and soils softened or made unsuitable for subsequent construction due to exposure to weather or groundwater. Backfill with common fill and compact as specified on the delivery order or shown on any accompanying drawings.

Contractor shall identify unsuitable materials areas. Over-excavation of unsuitable materials shall not exceed more than 24 inches depth. Government approval shall be obtained prior to any over-excavation.

When foundation material is over-excavated beyond specified or directed lines, fill the over-excavation with backfill materials and compact per the requirements of this SOW. If foundation material is over-excavated by being disturbed or loosened during excavation, compact material in place or remove and replace with backfill material and compact in accordance with this SOW.

Common fill brought in from off-site locations to be used as backfill shall contain less than 100 parts per million (ppm) of total petroleum hydrocarbons (TPH) and less than 1 ppm of the sum of

Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX). Provide borrow site testing for TPH and

BTEX from a composite sample of the material from the borrow site, with at least one test from each borrow site. Imported soil materials shall not be brought on site until tests have been approved by the COR.

Prior to any backfill operations, remove all demolished concrete lining, vegetation, and any debris from the excavations. Fill and backfill to build base to top of subgrade elevation to match adjacent panels. Compact each lift before placing overlaying lift. Sloped walls of concrete canals are at run: rise of 1.5:1.

Common fill shall be placed in maximum 6-inch (compacted depth) lifts. Compact areas not accessible to rollers or compactors with mechanical hand tampers. Aerate material excessively moistened to a satisfactory moisture content. Finish to a smooth surface by blading, rolling with a smooth roller, or another proposed/accepted means. Backfill against concrete only when approved. Place and compact material to avoid loading upon or against the structure.

Finish grades are typically to be the same as the existing adjacent panels. For existing grades that will remain, but which were disturbed by the Contractor’s operations, grade and compact as directed. Protect newly graded areas from traffic, erosion, and settlements that may occur.

Repair or re-establish damaged grades, elevations, or slopes.

Remove and adequately dispose other soil material not required or suitable for filling or backfilling, as well as brush, refuse, stumps, roots, and timber resulting from the work.

Section B Price Schedule CLIN 1005 is to remove, haul, and dispose of existing sediment, over-excavation, riprap, and debris inside the check structure demolition area. CLIN 1005 includes broken pieces of concrete canal lining in situ, as well as unsuitable materials/soils, metals, and cut vegetation. The contractor shall make their own calculations to verify quantities.

Section B Price Schedule CLIN 1006 is to saw cut, remove, and dispose of existing damaged areas of canal liner to be replaced with new 3 ½” concrete. CLIN 1006 is specific to intact concrete liner of the dimensions listed in SOW Appendix 1 ‘Intended Repair’ column.

Section B Price Schedule CLIN 1007 is to furnish, place, and compact backfill material for the placement of new concrete canal panel lining or repairs. CLIN 1007 lists the estimated quantity of new imported fill material to be furnished. However, CLIN 1007 covers the global preparation of subgrade for all new concrete liner construction, assumed to include scarification of existing reusable subgrade beneath removed panels to a depth of up to 12 inches, and compaction (as described below) of any reused and new imported common fill.

Compaction

Place backfill and fill materials in layers not more than 6 inches in loose depth for material compacted by heavy compaction equipment, and not more than 4 inches in loose depth for material compacted by hand-operated tampers.

Place backfill and fill materials evenly on all sides of structures to the required elevations. Place backfill and fill uniformly along the full length of each structure.

Compact soils to not less than the following percentages of minimum dry density according to

ASTM D 698.

-Under concrete canal lining and concrete transition structure extensions, compact the top 12 inches below subgrade and each layer of backfill or fill at 90% minimum dry density.

-Under other areas, compact the top 6 inches below subgrade and each layer of backfill or fill material at 90% minimum dry density.

Compacted materials shall be tested by the contractor to determine compliance with specified requirements. The Government or its representative using specified test procedures or

Reclamation test procedures described in the Bureau of Reclamation Earth Manual may conduct random compaction testing as to check conformance with requirements herein.

Controlled Low-Strength Material

Place CLSM or ‘grout slurry fill’, behind canal panels where voids are visible on the top edge of the MOD/MODE. Properties shall include flowability, self-leveling, and self-consolidating. Fill the voids behind the panels to match with existing adjacent grade. Refer to Specification Section

31 23 70.

Concrete

Materials:

Portland Cement shall be Type V (IL HS) or Type II/V, Low Alkali, and meet the requirements of ASTM C 150. Cement shall meet equivalent alkali requirements of ASTM C 150, Table 1 and early stiffening requirements of Table 4.

Pozzolan shall meet the requirements of ASTM C 618, except,

a. Sulfur trioxide for Class F, maximum: 4.0 percent.

b. Loss on ignition, maximum: 2.5 percent.

c. Test for effectiveness in controlling alkali-silica reaction under optional physical requirements in Table 3 of ASTM C 618. Use low-alkali cement for test.

Water shall meet the requirements of ASTM C 1602, including optional requirements of Table 2.

Sand shall meet the requirements of ASTM C 33.

Coarse aggregate shall meet the requirements of ASTM C 33, grading for either size No. 467

(1½ inch to No. 4) or size No. 57 (1 inch to No. 4).

Air-Entraining Admixture shall be the requirements of ASTM C 260. Use a neutralized vinsol resin formulation for air-entraining admixture used with ASTM C 494, Type F or G; and ASTM

C 1017, Type I or II chemical admixtures.

Chemical admixtures for concrete shall meet the requirements of ASTM C 494, Type A, D, F, or

G, S or ASTM C 1017, Type I or II. Do not use chemical admixtures which contain more than

1/10 of 1 percent chloride by weight.

Curing compound shall meet the requirements of ASTM C 309.

Polyethylene film shall meet the requirements of ASTM C 171 and be a minimum of 4 mils thick. Use white or clear in the summer and black in the winter.

Properties:

Compressive Strength: Approved concrete design mixes shall provide normal weight concrete with 28-day compressive strength of 3,000 psi. The Contractor shall be responsible to ensure concrete is set prior to water flowing through the canal. To ensure concrete is set, the last concrete placed will be required a minimum concrete strength of 500 psi on the final day before the outage ends.

Design mix for the minimum cementitious materials contents listed in Table A below. Pozzolan is an acceptable partial replacement for cement and if used, replace 20 percent of cement by weight. It should also be noted, currently there are only two Reclamation approved concrete suppliers in Yuma, BLT Companies (928-726-1951) and CEMEX (928-343-4150).

Table A

Nominal maximum size aggregate in concrete

(inches)

Minimum cementitious materials content without water-reducing admixture

(lb/yd3)

Minimum cementitious materials content with water-reducing admixture

(lb/yd3)

1-1/2 565 535

1 620 585

Air-entraining admixture: Use an amount that results in entrainment of 3.5 to 6.5 percent air, by volume, of concrete as discharged at placement.

Slump: Not exceeding 3 inches plus or minus 1 inch when placed, nor 5 inches when first mixed, unless a type 1 or 2 plasticizing chemical admixture is used to provide flowing concrete for an unusual placing condition, in which case provide concrete having a slump appropriate for placing conditions.

Placement:

Batching, mixing, and transporting of concrete shall be per the requirements of ASTM C 94-04a.

Copies of all batch tickets shall be submitted to project COR for record purposes.

Use forms to shape concrete to required lines.

Concrete temperature at placement: Between 50 degrees F and 90 degrees F.

Cure concrete with water, curing compound or polyethylene film.

1. For water cured concrete, keep concrete continuously moist for at least 14 days after being placed by sprinkling or spraying, or by other methods approved by the COR.

2. Curing compound application: Reclamation Construction Manual.

3. Polyethylene film: Keep concrete continuously moist for at least 14 days after placement.

The contractor shall be responsible to ensure concrete is set prior to water flowing through the canal.

Protect concrete against damage until final acceptance by the Government.

Concrete Canal Lining

Unreinforced concrete canal lining shall be constructed in the canal prism in the locations listed in Appendix 1. The size of panels varies in width and height, and the typical case is replacement by saw cutting at existing joints both horizontal (longitudinal) and vertical (transverse) between panels. In many cases the full panel requires replacement and at others the top 6 feet are removed and reconstructed. Concrete canal lining includes the concrete in unreinforced concrete transitions adjacent to any structures.

Prior to placing concrete canal lining, moisten the canal prism to prevent excessive water loss from the placed concrete.

No equipment travel over new lining will be allowed prior to the lining concrete having attained a 2,500 psi test result as determined by the Government.

Construction Joints:

When concrete canal lining placing operations are interrupted because of breakdown, or delayed by other causes, or where the Contractor elects to construct a joint, the edge of the fresh concrete lining shall be bulkheaded to a surface normal to the lining along transverse or longitudinal lines.

The fresh concrete shall then be placed against the existing concrete with a concrete bonding agent, ASTM C-881, Types I, Grade 2. Care shall be taken to keep surface clean and any loose concrete from earlier pour is to be removed prior.

Groove Joints:

Groove joints shall be constructed in unreinforced concrete canal lining. Longitudinal and transverse groove joints shall be placed at spacings that vary, however the spacing shall not be less than 6 feet nor greater than 12 feet on center. Generally, groove joints will match the pattern of existing adjacent panels. The completed groove shall be sealed with elastomeric sealer as shown on the drawings and described below.

Expansion Joints:

Expansion joints shall be constructed as per Drawing 423-303-60179. Expansion Joint Type 1 is required when a canal lining repairs spans across the width of the canal including left, bottom, and right panels. Expansion Joint Type II applies at the boundary between new and existing concrete panels.

Sealants:

Sealants for groove and expansion joints shall meet the requirements of ASTM C-920, Type M, Grade NS, with an appropriate primer for water emersion service. Approved sealant will have the following salient characteristics:

1. Sealant shall be a 2-part polyurethane-based elastomeric sealant.

2. Sealant shall be self-leveling and suitable for both horizontal and vertical applications.

3. Sealant shall be capable of ±50% joint movement.

4. Minimum shelf life of one year in original unopened container.

5. Minimum Service Range of -20° to 170° F.

6. Curing Rate as determined by ASTM C-679.

a. Tack-Free Time --- 5 to 8 Hours

b. Final Cure Time --- 3 Days

7. Tear strength as determined by ASTM D-624, minimum 40 lb./in.

Joint filler installation steps are as follows:

1. Clean and prepare joint in accordance with sealant manufacturer’s instructions.

2. Remove mortar, laitance, dust, coatings, curing compounds, petroleum products, corrosion, and other foreign material.

3. Allow joint to dry.

4. Prime joint surfaces as recommended by sealant manufacturer for joint materials.

5. Install in accordance with manufacturer’s instructions.

6. Add backing rod for joints greater than 1”, e.g. Expansion Joint Type 1.

7. Place and tool to smooth joints free of air pockets, embedded foreign material, ridges, and sags.

8. Remove defective or contaminated sealant. Re-clean joint and replace sealant.

9. Remove excess sealant and soiling from adjacent surfaces.

The acceptable ranges for joint width and sealant depth are in Table B.

Table B

Type of Joint Joint Width Sealant Depth

Joints in porous materials

(concrete, masonry, stone, etc.) and between porous materials and nonporous materials

1/4 to 3/8 inch Equal to joint width

3/8 to 3/4 inch 3/8 inch

3/4 inch or greater 1/2 inch

Other joints All widths 50 percent of joint width or

1/4 inch, whichever is greater

Expansion joint filler used beneath joint sealant layer, where used, shall be as per ASTM D1751.

9. MISCELLANEOUS REQUIREMENTS

Safety and Health

Subtask 9.1- Prepare Safety Program and Job Hazard Analysis (JHA) List as per RSHS. Submit all site-specific documents in draft for review/acceptance/approval prior to any onsite work. The

Contractor is responsible for adhering to all applicable rules, regulations, and laws relating to safety and health of personnel, including environmental quality control. This applies to all aspects of the Contractor’s operations including mobilization/demobilization.

The Contractor shall develop and submit a Safety Program, written and implemented for the proposed cleaning, demolition, and construction operation as per Table 01 33 00A (List of

Submittals). The Contractor’s submitted Safety Program and JHA shall identify, evaluate, and control safety and health hazards, and will be reviewed and approved by the CO, prior to start of any onsite work. All site workers shall be familiar with both and shall be given training on their contents. The Contractor shall document all training of all site workers. Standards of approval will be determined by compliance with all OSHA regulations.

Onsite work shall not begin until the COR has reviewed the Safety Program and JHA in final form and determined that all are accepted before proceeding with onsite work.

Subtask 9.2- Implement Safety Program. Work shall be performed in compliance with the clauses in FAR 52.236-13 - Accident Prevention, WBR 1452.223-81- Safety and Health, with

RSHS, OSHA, local safety programs, referenced safety and health standards, and the accepted program/plans.

Specialist personnel and reporting shall be in accordance with Specification 01 35 30

Contractor’s Onsite Safety Personnel. The Onsite Safety Representative shall be responsible for general oversight/compliance with OSHA/RSHS. Onsite Safety Representative leads preparation and implementation of the above-referenced documents ensuring conformance of Contractor personnel to the same. Onsite Safety Representative shall maintain on site proof of all training.

When safety or health violations are called to the Contractor’s attention by the CO or authorized representative, the Contractor shall immediately correct the condition. Such notice, either orally or in writing, when served on the Contractor or the Contractor’s designated onsite representative will be deemed sufficient. Oral notices will be confirmed to the Contractor in writing by the CO.

Specific signs, barricades, and flagmen requirements are detailed in OSHA and the American

National Standards Institute’s "Manual on Uniform Traffic Control Devices for Streets and

Highways" (ANSI D6.1).

Roads subject to interference by the work shall be kept open or suitable detours shall be provided and maintained by the Contractor. The Contractor shall provide, erect, and maintain all necessary barricades, suitable and sufficient flasher lights, flag persons, danger signals and signs, and shall take all necessary precautions for the protection of the work and safety of the public.

Roads closed to traffic shall be protected by effective barricades, warning, and detour signs. All barricades and obstructions shall be illuminated at night and all lights shall be kept on from sunset until sunrise.

In the event the Contractor fails or refuses to promptly comply with all Federal, State, and Local safety and health laws, regulation, codes, and standards the CO may issue an order to suspend all or any part of the work. When satisfactory corrective action is taken, an order to resume work will be issued. The Contractor shall not be entitled to any extension of time, nor to any claim for damage or to additional costs by reason of either the directive or the suspension order. Failure of the CO to order discontinuance of any or all of the Contractor’s operations shall not relieve the

Contractor of the responsibility for the safety of personnel and property.

Field Quality Control

The Government will conduct field inspections and witness field tests specified in this section.

The Contractor shall perform field tests and provide labor, equipment, and incidentals required for testing. Be able to produce evidence, when required, that each item of work has been constructed properly in accordance with the drawings and statement of work.

Coordination of Work with Others

The Contractor will work in the presence of U.S. Border Patrol agents along the western edge of the construction work area. Agents in Government Identified Vehicles will need unimpeded travel access along Levee Road. For the construction area, there are travel lanes available on each side of the structure. At all times one lane for traffic must be available.

Many levee roads are traveled by local farmers who use large farm equipment. For the same reasons stated above, one lane for traffic must be available.

Contractor shall propose laydown areas for equipment to CO for approval, mindful of outside entities including those above and transit near West/East Wetlands public park.

Site Security

The site at the MOD/MODE/US Bypass canals includes fenced and unfenced areas.

For fenced areas, the Contractor shall restrict entrance of personnel and vehicles, including vehicles of subcontractors and suppliers, into project site and existing facilities. Entry shall be limited to the construction work area and all contractor and subcontractor employees must have proper identification. Suppliers and delivery vehicles must be escorted onsite by the

Contractor’s superintendent. Maintain daily sign-in sheet of all site employees. Suppliers and delivery vehicles must be escorted onsite by the Contractor’s superintendent.

The US Bypass work area is near or along the US-Mexico border and is prone to border activity, and in some cases could be dangerous. Report any suspicious activity, do not interfere with

Border Patrol operations, and take necessary precautions to keep employees safe. Access to the west side of US Bypass will require entry via lockable gates at each crossing bridge. Entry of contractor vehicles obligates immediate closure of gates behind. Access through such gates is strictly in coordination with and as authorized by DHS and BLM.

MOD Section J does not have fenced in staging area. Reclamation will arrange so that the

Contractor daisy chains their own lock to access fenced-in areas near Sections 23 and Section

BP-7, if desired.

Construction Work Areas are defined as areas where work is required under this contract. This includes designated access routes and any areas used by the Contractor for temporary field offices, service areas, storage areas, or parking areas.

All work is to be performed in areas that do not require access cards or keys to access the area.

Access cards and keys will not be issued for this contract.

Deliverables

The Contractor shall furnish all materials and perform all work required for furnishing submittals to the government, in accordance with Table 01 33 00A - List of Submittals found within the specifications and the requirements in the Statement of Work.

The Contractor shall send all submittals via email to COR and CO.

Biopreferred Program

The United States Department of Agriculture (USDA) designates certain biobased products for federal procurement and specifies minimum biobased content levels for those products. Any designated product that is being offered or supplied under this contract shall meet USDA

BioPreferred’s minimum biobased content level. Visit the BioPreferred website http://www.biopreferred.gov/BioPreferred/faces/pages/ProductCategories.xhtml for the complete list of designated products and the associated minimum biobased content level requirements.

Concrete Curing Agents and Concrete Repair Materials – Concrete Patching apply.

http://www.biopreferred.gov/BioPreferred/faces/pages/ProductCategories.xhtml

Acronyms

ASTM – American Society for Testing and Materials

BLM – Bureau of Land Management

BOR – Bureau of Reclamation

BTEX – Benzene, Toluene, Ethyl Benzene, and Xylene

CLIN – Contract Line Item Number

CLSM – Controlled Low Strength Material

CO – Contracting Officer

COR – Contractor Officer’s Representative

CS – Construction Superintendent

DHS – Department of Homeland Security

JHA – Job Hazard Analysis

MOD – Main Outlet Drain

MODE – Main Outlet Drain Extension

OSHA – Occupational Safety and Health Administration

PM – Project Manager

Ppm – parts per million

RSHS – Reclamation Safety and Health Standards

SOW – Statement of Work

TPH – total petroleum hydrocarbons

USDA – United States Department of Agriculture

10. REFERENCES

Reclamation Safety and Health Standards may be downloaded at https://www.usbr.gov/safety/rshs/index.html.

Guide to Concrete Repair may be downloaded at https://www.usbr.gov/tsc/techreferences/mands/manuals.html.

Appendix 1 – List of Repairs https://www.usbr.gov/safety/rshs/index.html https://www.usbr.gov/tsc/techreferences/mands/manuals.html