A1_IDIQ_SOW,_26_pages.pdf

140R3019B0002 Attachment (1): IDIQ Statement of Work/Specifications

SECTION C - STATEMENT OF WORK

STATEMENT OF WORK/SPECIFICATIONS

CANAL LINING REPAIR AND REPLACEMENT, IDIQ

1. INTRODUCTION:

The proposed project will establish a multiple-year IDIQ contract for the repair or replacement of canal lining, structures (including concrete demolition and patching), and the removal of structures as needed.

2. BACKGROUND:

The Salinity Canal located in the Yuma, Wellton-Mohawk convey agricultural drainage flows from farmland to the Colorado River and its tributaries or to the Bypass Drain in Mexico. Uses and long-term maintenance and operation of the conveyance systems have changed since their construction in the 1970’s. Re-evaluation and redesign of certain features are needed for in-place maintenance and operational changes that are necessary to meet salinity and groundwater drainage management requirements.

Reclamation is responsible for maintaining the integrity of the existing structures and conveyance system including siphons, inlets and diversions, gates, and linings. The existing systems have been in continuous service in excess of 20 years and are showing signs of moderate to severe concrete deterioration and spalling at gate structures and siphons. There are also areas of severe cracking and heaving of the concrete canal lining.

Several of the radial gate structures no longer function and need to be removed. Their primary function was to backup water in the drain during high flow events on the Colorado or Gila Rivers and keep the concrete lining from floating. This function is now being completed by removable steel bulk heads that conform to the canal prism.

Anchor points have been placed approximately every 2,500 feet along the canal length. Because of the salinity issue, long outages to repair canal linings, siphons, and gated structures are becoming more difficult to accomplish. Unless there is excess flow in the river to dilute the saline drainage water, discharging the water to the river for extended periods of time is no longer practical or an acceptable practice. Repairs and inspections must be accomplished in shorter construction periods or alternative methods utilized to keep flows in the salinity canals while work is being completed.

Older areas of the canal system are showing signs of sulfate attack especially at gate and control structures. This sulfate intrusion into the concrete drastically reduces the strength and durability of the concrete and will eventually lead to failure if not addressed.

Based on recommendations from a local area ground water management study, Reclamation is also looking into enlarging various drainage outlet channels to meet new operational requirements associated with the updated groundwater management system and strategy.

3. OBJECTIVE:

The proposed work will include any required saw cutting, demolition, removal of designated lining or concrete structures, legal disposal of demolished materials, earthwork for new concrete lining repair and canal replacement, designated lining replacement, concrete lining expansion joint construction and installation, removing of old joint sealant and furnishing and installing new approved sealant, also removing damaged concrete and furnishing and installing patch repair to structures. The work will also include the removal of damaged safety ladders and furnishing and installing new safety ladders.

4. LOCATION:

MOD, MODE, and Bypass Drain Levee Roads, in Yuma, Arizona. Location of existing facilities is shown on the accompanying Drainage Facility Map, Drawing Number 423-303- 1567.

5. PERIOD OF PERFORMANCE:

Each individual task order will specify a performance period for the work covered under the task order.

6. SITE CONDITIONS:

Reclamation drainage facilities are accessible from existing public roads and government maintenance roads. There are portions of Reclamation facilities adjacent to the border with Mexico that may be difficult to access due to loose sandy material that may not support wheeled equipment or vehicle traffic and will require coordination with the Border Patrol.

Any work required in southern Yuma County adjacent to the Mexican border may require additional site security. Past contracts in the area have experienced theft and vandalism.

The weather in Yuma County is typical of the desert southwest. Summer highs can reach 120 degrees Fahrenheit, with lows into the low 80’s at night. There can be as much as a 50 degree difference in temperature over the course of a 24 hour period. 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. Thunder storms 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 rainfall for the Yuma area is approximately 3 inches.

Overhead and underground utilities may be present near to, paralleling, or crossing existing Reclamation drainage facilities. In addition to utilities, there are drainage wells and the associated discharge lines and miscellaneous farm equipment crossings.

In the event that unidentified utilities are encountered, work will stop until the Contracting Officer’s Representative (COR) has been contacted and the utility can be identified. The Contractor will not resume work until authorized by the Contracting Officer (CO).

7. REQUIREMENTS DEFINITIONS:

Backfilling: The use of onsite soil materials or approved imported soil materials as necessary to fill excavations as designated in the Statement of Work (SOW) or as outlined on the individual delivery order.

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

Canal Embankment: A raised ridge or platform of compacted earth used to confine and support an irrigation canal or waterway.

Porous Fill: ASTM C 33 fine aggregate grading with a maximum of 3 percent by weight passing ASTM D 1140 (1997), Number 200 sieve, or coarse aggregate Size 57, 67, or 77. Soil materials shall be free of debris, roots, wood, scrap material, vegetation, refuse, soft unsound particles, deleterious, or objectionable materials. Unless noted otherwise, the maximum particle size shall be one-half the lift thickness at the intended location.

Demolition: Removing and breaking up of designated canal lining, control structures, and other designated improvements within the project limits as described on the designated delivery order or any accompanying drawings. Demolition work shall apply to all structures and improvements whether on, above or below the ground surface.

Legal Disposal: The removal of demolished lining, structural concrete, patching and miscellaneous demolition and construction debris and trash and in accordance with state, county, and federal statutes. Reclamation will designate locations for the disposal unreinforced concrete canal lining. Disposal of unreinforced concrete canal lining from work under the issued Task Orders.

Approved Concrete Source: Contractor must submit to Reclamation concrete source with concrete mix design for approval for governmental work. The following concrete suppliers have been approved by Reclamation and are located in the Yuma Area they are CEMEX Materials and BLT.

Demolition Plan: Detailed written procedures for the removal and disposal of canal lining materials, water control structures, and miscellaneous designated items.

Patch Repair Material Epoxy Resin: The epoxy resin shall meet the requirements of specifications ASTM C 881 for a type 1, grade 2, class B or C or a type 3, grade 2, class B or C epoxy system. In addition it shall be a 100 percent solid system, and no unreactive diluents.

Wetting agents, or volatile solvents shall be incorporated.

8. PROJECT DESCRIPTION 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.

Completely remove the indicated concrete lining, reinforced concrete control structure, or other designated facility. Provide neat saw cuts at the limits of the lining removal as indicated. Saw cut along straight lines, full-depth. Break out and dispose the remainder of the concrete lining or structures. Remove the existing bedding and debris required to establish or re-establish the canal prism.

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. At the contractor’s option, non-reinforced concrete canal lining and structural concrete with reinforcing removed can be transported and stockpiled at the locations designated on the individual delivery order for future processing into gravel base.

During demolition and disposal activities, prevent the spread of dust and debris. The contractor will avoid the creation of a nuisance in the surrounding area in compliance with state and local statutes.

9. DESCRIPTION OF WORK:

1. Bonding and Insurance

2. Mobilization and Preparatory Work.

3. Provide all of the plans, labor, equipment, and materials necessary for Traffic Control per Task Order.

4. Provide all of the labor, equipment, and materials necessary for construction surveys per

Task Order.

5. Remove, haul, and stockpile existing material and debris that are inside the canal as indicated in the Task Order.

6. Saw cut, remove, and dispose of existing damaged areas of canal panel to be replaced with new 3” concrete as indicated in the Task Order.

7. Remove and properly dispose of the existing 3” thick unreinforced concrete canal lining panels to replace with new concrete canal panel as indicated in the Task Order.

8. Furnish, place, and compact, backfill material for the placement of new concrete canal panel lining repairs as indicated in the Task Order.

9. Furnish dewatering for localized nuisance water as indicated in the Task Order.

10. Furnish, install, and operate well points for lowering water table for construction as indicated in the Task Order.

11. Conduct testing for backfill material and new concrete for repairs and canal panel lining repair as indicated in the Task Order.

12. Furnish and install required concrete groove and expansion joints per indicated in the

Task Order.

13. Furnish and place new 3½” thick concrete panels for concrete canal lining within canal prism as indicated in the Task Order.

14. Furnish and place new 3½” thick concrete for repaired areas on canal lining panels as indicated in the Task Order.

15. Remove and dispose of existing damaged Safety Ladders as indicated in the Task Order.

16. Furnish and install Safety Ladders as indicated in the Task Order.

17. Saw cut, chip and remove concrete as required on canal structures, including sandblast, clean, reinforcing (as required) and coat rebar, as indicated in the Task Order.

18. Prepare concrete surfaces and patch spalled areas with epoxy concrete patching materials as indicated in the Task Order.

19. Remove, haul, and stockpile existing canal structures as indicated in the Task Order.

20. Furnish As-built drawings as indicated in the Task Order.

The contractor shall supply all utilities which includes but not limited to water, electric, and fuel for the work designated in the task order. Government will assist the contractor in locating a possible water source, but it will be the responsibility of the contractor to make arrangements to provide it.

10. EXISTING FACILITIES TO BE REMOVED:

Saw concrete along straight lines to a depth of not less than 2 inches. Make each cut in walls perpendicular to the face and in alignment with the cut in the opposite face. Break out the remainder of the concrete provided that the broken area is concealed in the finished work, and the remaining concrete is sound. At locations where the broken face cannot be concealed, grind smooth or saw cut entirely through the concrete.

All materials removed, shall become the property of the Contractor and shall be removed from Government property. Title to materials resulting from demolition is vested in the Contractor upon approval by the Contracting Officer of the Contractor's demolition and removal procedures, and authorization by the Contracting Officer to begin demolition.

The disposal of waste materials and rubbish shall be in accordance with applicable Federal, State, and local laws and regulations, with applicable requirements of Reclamation's publication "Reclamation Safety and Health Standards- 2012 Edition" and with the requirements of this paragraph. Contractor shall keep records on and provide totals to Reclamation on the amount of waste disposed of and materials that are recycled.

The Contractor shall keep work and storage areas free from accumulations of waste materials and rubbish, and before completing the work, shall remove all rubbish and other like materials, which are not a part of the permanent work.

Waste materials known or found to be hazardous shall be disposed of in approved treatment or disposal facilities. Hazardous wastes shall be recycled whenever possible. Contractor shall submit a copy of the hazardous waste manifest for hazardous materials that are transported to an approved treatment facility, an approved disposal facility, or an approved recycle center.

Waste materials including, but not restricted to, refuse, garbage, sanitary wastes, industrial wastes, and oil and other petroleum products, shall be disposed of by the Contractor.

Waste materials to be disposed of by removal from the construction area shall be removed prior to completion of the work under these specifications. All materials removed shall become the property of the Contractor.

11. PROTECTION OF EXISTING FACILITIES:

In performing work on the various bridges, the Contractor shall take all necessary precautions to safeguard the existing installations. The Contractor shall obtain the locations of embedded conduit, piping, cable, and other embedded items before performing any drilling, chipping or cutting of concrete, and shall protect adjacent installations during its construction operations.

The Contractor shall furnish, install and maintain adequate protection as needed to safeguard personnel and existing facilities from harm due to the Contractor's operations. Such protection shall be subject to approval of the Contracting Officer.

All protective installations shall be arranged so as to permit operation of the existing facilities by the Government while work under these specifications is in progress. The Contractor shall remove all protective installations which it has provided after they have served their purpose.

The materials furnished by the Contractor to provide protection shall remain the property of the Contractor, and after removal, shall be transported from the worksite.

The Contractor shall repair, at the Contractor's expense, any damage to existing bridges or bridge appurtenances due to the Contractor's operations or the Contractor's failure to provide proper protection; or at the option of the Contracting Officer, any such damage may be repaired by the Government, and the Contractor will be back charged for the cost thereof.

12. CONSTRUCTION SURVEY:

The work under this section shall consist of furnishing all materials, personnel, equipment, and incidentals necessary to perform the required surveying, staking, and verification of the accuracy existing Government provided control points. Included in this work shall be all calculations required for the satisfactory completion of projects, including grade and drain, overlay, safety, landscape, rest areas, structures, surfacing projects, or combinations thereof, in conformance with the plans and these specifications. The work shall include establishing and marking as-built elevations on right-of-way markers, bridges, and culverts. The work shall be done under the direction of a registered professional engineer or a registered land surveyor employed by the contractor. The crew chief shall be National Institute for Certification in Engineering Technologies (NICET) Certified Level III or a registered professional land surveyor. A minimum of 50 percent of the survey crew shall be NICET Certified Level II or possess at least a Land Surveyor-In-Training certificate. All right-of-way monuments and lines shall be established by a registered land surveyor employed by the contractor.

When utility adjustments are a part of the contract, the contractor shall perform all layout work and set all control points, stakes, and references necessary for carrying out all such adjustments.

The contractor shall provide qualified personnel and necessary equipment to survey, stake, calculate, and record data for the control of work. Resumes demonstrating the required experience shall be submitted to the COR for approval prior to starting any survey.

13. DEMOLITION AND REMOVAL OF STRUCTURES:

Remove and transport construction debris and rubbish in a manner that will prevent spillage on public roadways and adjacent areas. Clean up spillage from streets and adjacent areas.

Removed concrete lining materials can be reused, and or stockpiled at the designated locations for future processing into gravel base.

During demolition and disposal activities, prevent the spread of dust and debris. The contractor shall avoid the creation of a dust nuisance in the surrounding area in compliance with Federal, state, and local statutes.

The work under this section shall consist of the removal, wholly or in part, and satisfactory disposal of all structures and obstructions within the right-of-way which have not been designated on the Task Order, except for those structures and obstructions which are to be removed and disposed of under other items of work in the contract. The work shall also include salvaging of designated materials and backfilling the resulting cavities.

Existing structures, and other existing improvements that are to become an integral part of the planned improvements shall remain, even though they are not specifically noted.

Materials removed and not designated to be salvaged or incorporated into the work shall become the property of the contractor.

Items designated to be salvaged shall be carefully stockpiled or stored by the contractor at locations as directed by the CO.

Items that are to be salvaged or reused in the new construction and are damaged or destroyed as a result of the contractor's operations shall be repaired or replaced by the contractor at no additional cost to the Government.

Holes, cavities, trenches and depressions resulting from the removal of structures or obstructions (except in areas to be excavated) shall be backfilled with suitable material which shall be compacted to a density of not less than 95 percent of the maximum dry density of a Standard or Modified Proctor as determined in accordance with the requirements of the applicable test methods noted on the task order or as directed and approved by the CO.

14. EXCAVATION AND FILL:

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

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 or provide other means to prevent wind-blown dust.

Excavate to the elevations and dimensions indicated in the individual delivery order or on any accompanying drawings. Reuse excavated materials that meet the requirements as defined above in definitions. Keep excavations free from standing water. Excavate soil disturbed or weakened by Contractor’s operations and soils softened or made unsuitable for subsequent construction due to exposure to weather. Refill with common or porous fill and compact as specified on the delivery order or shown on any accompanying drawings.

Excavate pipe trenches for pipelines, delivery installations, and pipeline accessories to lines, grades, and dimensions as detailed on the individual delivery order.

Finish bottom of trench accurately to the lines and grades as detailed on the individual delivery order. Perform excavation in the dry.

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 or porous fill brought in from offsite 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 THP 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 Contracting Officer.

Prior to any backfill operations, remove all concrete formwork and any trash or debris from the excavations. Fill and backfill to contours, elevations, and dimensions indicated. Compact each lift before placing overlaying lift.

Common fill shall be placed in 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 both.

Backfill and fill material shall be placed in 6 inch lifts. Place backfill material adjacent to structures as the structural elements are completed and accepted. Backfill against concrete only when approved. Place and compact material to avoid loading upon or against the structure.

Backfill of pipe trenches shall be completed as rapidly as construction, testing, and acceptance of work permits. Place and compact backfill under structures in 6 inch lifts to top of trench and in 6 inch lifts to one foot over pipe outside structures.

Except as noted otherwise in this SOW provide bedding for buried piping in accordance with AWWA C600 (1999), Type 4, except as noted below. Backfill to top of pipe shall be compacted to 95 percent of ASTM D 698 (1991) maximum density. Provide ASTM D 2321 (1989; Rev.

1995) materials as follows:

Class I: Angular, 0.25 to 1.5 inches, graded stone.

Class II: Coarse sands and gravels with a maximum particle size of 1.5 inches, including various graded sands and gravels containing small percentages of fines, generally granular and noncohesive, either wet or dry. Soil types GW, GP, SW, and SP are included in this class as specified in ASTM D 2487 (1998).

Finish grades as indicated within one-tenth of one foot. For existing grades that will remain but which were disturbed by the Contractor’s operations, grade as directed.

Protect newly graded areas from traffic, erosion, and settlements that may occur. Repair or re-establish damage grades, elevations, or slopes.

Remove from Government property surplus or other soil material not required or suitable for filling or backfilling, and brush, refuse, stumps, roots, and timber.

Compacted materials may be tested to determine compliance with specified requirements.

The compaction tests will be made by the Government or its’ representative using specified test procedures or USBR test procedures described in the Bureau of Reclamation Earth Manual.

15. CANAL EMBANKMENTS:

Obtain materials from required excavation or use borrow material. The maximum dimensions of stones placed in embankments to be compacted shall not exceed 5 inches. Remove stones and indurated material larger than 5 inches prior to compacting operations.

Construct canal embankments to top widths and side slopes as shown on the or as detailed on the individual delivery order. To provide an allowance for settlement, build embankment to heights as directed above those as outlined in the individual delivery order. Place, moisten, and compact all materials in embankments to 95% of the ASTM D 698- 91 density. Where existing soil is to wet for compaction, the Contractor shall remove all wet soil or a minimum of 12 inches into the slope of the bank.

Materials for embankments shall be suitable materials, as determined by the COR. All material for embankment for canals shall meet the requirements of common fill and shall contain no rock or stones larger than 3″. If approved by the Contracting Officer and suitable material is available from areas adjacent to the proposed work.

Construction of canal embankments shall be such that the materials used will result in an acceptable gradation and provide for impermeability and stability when compacted. The maximum dimension of rock or stone placed in canal embankments shall not exceed 3″. Rocks (larger than 3″), trash, and vegetation shall be removed prior to compacting operations.

Where the original ground surface is below the grade of the canal and where compacted fill below the bottom of the canal is required, place fill material as embankment. Where the original ground surface is below the base of a structure or where sloping concrete walls or slabs extend above the original ground surface and it is possible to construct the walls or slabs directly on an earthen foundation without the use of intervening formwork, construct compacted embankments to the lines and grades as shown to form a suitable foundation for designed concrete work.

16. EXCAVATION FOR STRUCTURES:

The Contractor shall excavate to the indicated elevations and dimensions within a tolerance of plus or minus one-inch. Excavation shall be extended a sufficient distance from structures for placing and removing concrete form work, installing services and other construction and/or inspections.

The excavation shall not be disturbed. Re-compacting of the subgrade shall be required if the excavation is disturbed. The Contractor shall excavate to final grade and shall trim the excavations to the required lines and grades leaving a solid base to receive concrete or the precast structure.

17. COMPACTION:

Place backfill and fill materials in layers not more than 8 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 1557-00.

Under concrete canal lining and concrete transition structure extensions, compact the top 12 inches below subgrade and each layer of backfill or fill at 95% 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.

18. CONCRETE:

Materials:

Portland cement shall be Type II, Low Alkali or Type 5, and meet the requirements of ASTM C 150-04a. Cement shall meet equivalent alkalis requirements of ASTM C 150-04a, Table 2 and false-set requirements of Table 4.

Pozzolan shall meet the requirements of ASTM C 618-05, except, Sulfur trioxide for Class F, maximum: 4.0 percent.

Loss on ignition, maximum: 2.5 percent.

Test for effectiveness in controlling alkali-silica reaction under optional physical requirements in Table 2 of ASTM C 618-05. Use low-alkali cement for test.

Water shall meet the requirements of ASTM C 1602/1602M-05, including optional requirements of Table 2. Sand shall meet the requirements of ASTM C 33-03.

Coarse aggregate shall meet the requirements of ASTM C 33-03, gradings 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 260-01. 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 494-05, Type A, D, F, or G or ASTM C 1017-03, Type I or II. Do not use chemical admixtures which contain more than 1/10 of 1 percent chloride by weight.

Reinforcing bars shall conform to ASTM 615 grade 60.

Curing compound shall meet the requirements of ASTM C 309-03.

Polyethylene film shall meet the requirements of ASTM C 171-03 and be a minimum of 4 mils thick. Use white or clear in the summer and black in the winter.

Reinforcing steel for structures shall meet the requirements of ASTM A 615-05a, Grade 60 or ASTM A 996-05a, Type A, Grade 60.

Approved concrete design mixes to provide normal weight concrete with the following properties:

Concrete for structures require a 28 day compressive strength of 4,000 psi, with a slump range of 1 to 4- inches. Concrete water-cement ratio of 0.45 (by weight) maximum and an air entrainment of 5% plus or minus 1.5%.

Concrete for canal linings requires a 28 day compressive strength of 3,000 psi, with a slump range of 1 to 3- inches. Concrete water-cement ration of 0.45 (by weight) maximum and an air entrainment of 5% plus or minus 1.5%.

Design mix for the minimum cementitious materials contents listed in Table 1B below. Pozzolan is an acceptable partial replacement for cement and if used, replace 20 percent, by weight, cement. It should also be noted, currently there are on two Reclamation approved concrete suppliers in Yuma, BLT Companies (928-726-0435) and CEMEX Materials (928-343-4100).

Table 1B

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 4 to 6 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.

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

Batch tickets shall be delivered to the project COR or an approved alternate as designated by the Contracting Officer.

Forms, preparation for placing, and placing: Forms shall be sufficiently tight to prevent loss of mortar from the concrete and shall be maintained rigidly in position until the concrete has hardened sufficiently to prevent damage by form removal. All surfaces of foundations upon or against which concrete is to be placed shall be free from standing water, mud, and debris. Earth foundations shall be free from frost or ice when concrete is placed upon or against them. The surfaces of absorptive foundations against which concrete is to be placed shall be moistened thoroughly so that moisture will not be drawn from the freshly placed concrete. The surfaces of construction joints shall be clean, rough and loose of defective concrete, coatings, sand, curing compound, and other foreign material. The surfaces of the construction joints shall be wet sandblaster or bush hammered, washed thoroughly, and surface dried prior to placement of adjoining concrete. A mortar layer shall not be used on concrete construction joints.

The methods and equipment used for transporting concrete, and the time that elapses during transportation shall be such as will not cause appreciable segregation of concrete ingredients or slump loss in excess of 2 inches in the concrete as it is delivered to the work. Aluminum pipes and chutes shall not be used for placing of concrete or for the delivery of pumped concrete.

Retempering of the concrete will not be permitted. Any concrete which has become so stiff that proper placing cannot be assured shall not be used. The temperature of the concrete when it is being placed shall be not more than 90°F and not less than 50°F.

Formed concrete shall be placed in continuous, approximately horizontal layers, the depths of which should generally not exceed 20 inches. Concrete shall be vibrated until it has been consolidated to the maximum practicable density, is free from pockets of coarse aggregate, and closes snugly against all surfaces or forms and embedded materials.

Place steel reinforcing bars as shown on the on the plans supplied with the individual delivery order. Before reinforcement is placed, clean it of heavy, flaky rust, loose mill scale, dirt, grease or other foreign substances. Place and secure the steel reinforcement in position so that it will not be displaced during concrete placement.

Use forms to shape concrete to required lines.

Cure concrete with water, curing compound or polyethylene film.

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 CO.

Curing compound application: USBR CM.

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

Protect concrete against damage until final acceptance by the Government

19. CONCRETE CANAL LINING:

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

Unreinforced concrete canal lining shall be constructed in the canal prism as detailed on the delivery order. Concrete canal lining includes the concrete in unreinforced concrete transitions adjacent to any structures.

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.

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. The completed groove shall be sealed with elastomeric sealer as shown on the drawings.

Joints shall be constructed in unreinforced concrete canal lining as detailed on the task order. As a minimum, transverse groove joints shall be placed at spacings that vary, however the spacing shall not be less than 5 foot on center or greater than 12 foot on center. A minimum of one expansion joint will be placed in replaced lining sections and every 500 feet depending on the length of canal replacement. Locations of expansions will be detailed out on the individual delivery order.

Sealants for transverse groove joints and for expansion joints shall meet the requirements of ASTM C-920-05, Type M, Grade NS, with an appropriate primer for water emersion service.

Approved sealant will have the following salient characteristics:

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

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

Sealant shall be capable of ±50% joint movement.

Minimum shelf life of one year in original unopened container.

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

Curing Rate as determined by ASTM C-679-03

Tack-Free Time --- 5 to 8 Hours

Final Cure Time --- 3 Days

Tear strength as determined by ASTM D-624-00e1, minimum 40 lb./in.

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

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

Allow joint to dry.

Prime joint surfaces as recommended by sealant manufacturer for joint materials. Install in accordance with manufacturer’s instructions.

Place sealant to the depth shown on the delivery order or per the requirements of the Table C.

Table C

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

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

Remove defective or contaminated sealant. Re-clean joint and replace sealant. Remove excess sealant and soiling from adjacent surfaces.

20. EPOXY CONCRETE:

Epoxy Resin:

The epoxy resin shall meet the requirements of specifications ASTM C 881 for a type 1, grade 2, class B or C or a type 3, grade 2, class B or C epoxy system. In addition it shall be a 100 percent solid system, and no unreactive diluents. Wetting agents, or volatile solvents shall be incorporated.

Preparation of Epoxy Resin:

The epoxy resin is a two-component material which requires a combination of components and mixing prior to use. Once mixed, the material has a limited pot life and must be used immediately. The bonding system shall be prepared by adding the curing compound to the resin compound in proportions recommended by the manufacturer, followed by thorough mixing.

Since the working life of the mixture depends on the temperature (longer at lower temperatures, much shorter at higher temperatures), the quantity to be mixed at one time shall be applied and topped within approximately 30 minutes. The addition of thinner or dilutents to the resin mixture will not be permitted.

Application of Epoxy Resin Bond Coat for Surface Repairs: Immediately after the epoxy resin is mixed, it shall be applied to the prepared, dry existing concrete at a coverage of not more than 80 square feet per gallon, depending on surface conditions.

The area of coverage per gallon of agent depends on the roughness of the surface to be covered and may be considerably less than the maximum specified. The epoxy resin may be applied by any convenient, safe method such as a squeegee, brush, or roller, which will yield an effective coverage, except that spraying of the materials will be permitted only if an efficient airless spray is used and when the concrete surfaces to receive the agent are 70 degrees Fahrenheit or warmer, which spray shall be demonstrated as providing an adequate job with a minimum over spray prior to approval of its use. If spray application is used, the operator shall wear a compressed air-fed hood, and no other personnel shall be closer than 100 feet downwind of the operator when spraying is being performed.

The exposed steel shall be completely coated with epoxy resin at the time it is being applied to the concrete surfaces of the repair area.

The epoxy resin may be allowed to stiffen to a very tacky condition rather than a fluid condition before concrete is placed on steep sloping or vertical surfaces. In the event that the applied film cures beyond the tacky condition before the concrete is placed, a second bond coat shall be applied while the first bond coat is still tacky. If the bond coat has cured beyond the tacky state, it shall be completely removed by sandblasting, and proper cleanup, heating, and drying shall be accomplished, and a new bond coat applied.

21. PLACING AND FINISHING:

Use of epoxy bonded concrete in repairs requiring forming, such as on steeply sloped or vertical surfaces, will be permitted only when the forming required is such that the bond coat can be applied and the concrete properly placed within the time period necessary to ensure that the applied bond coat will still be fluid, or tacky where permitted.

Immediately after application of the epoxy bond coat, while the epoxy is still fluid, concrete shall be spread evenly to a level slightly above grade and compacted by vibrating, tamping, or both.

Vibrators shall not be permitted to penetrate through the fresh concrete to the level of the fluid epoxy bond coat.

The surfaces of epoxy-bonded concrete repairs shall be finished to the plane of the surfaces adjoining the repair area. The final finished surfaces shall match the texture of the surfaces adjoining the repair areas.

As soon as the epoxy-bonded concrete has hardened sufficiently to prevent damage, the surfaces shall be moistened by spraying lightly with water and then covering with sheet polyethylene, or by applying an approved curing compound. Sheet polyethylene, if used, shall be an airtight, non-staining, waterproof covering which will effectively prevent loss of moisture from the concrete by evaporation. Edges of the polyethylene shall be lapped and sealed. The water proof covering shall be left in place for no less than 7 days and 10 days if the water outage can be extended.

22. REINFORCEMENT:

Comply with Concrete Reinforcing Steel Institute’s recommended practice for placing reinforcing Bars, for details and methods of reinforcement placement and supports as specified.

Clean reinforcement of loose rust and mild scale, earth, and other materials that reduce or destroy bond with concrete. Reinforcing steel bar shall conform to the requirements of ASTM A 615-96a, grade 60.

23. CURING AND PROTECTION:

Per requirements per ACI 318- 1989.

24. PENETRATING SEALER AND HIGH BUILD MASTIC FOR CONCRETE:

The following products are recommended: Penetrating Sealers Devoe Pre Prime 167, and Wasser NeoTech 855, or an equal to that meets these standards. High build Mastic Devoe Devthane 359, and Wasser NeoMastic or equal to according to standards.

25. PENETRATING SEALER:

A high performance, two-component chemically cured 100% solids epoxy penetrating sealer, also theoretical coverage at 1.0 Mil Dry 1604 sq. ft./gal.

High Build Mastic:

A high build, high performance two- component chemically- cured aliphatic urethane gloss enamel for use in areas where maximum gloss & color retention are required.

1. Theoretical coverage at 1.0 Mil (25 microns), dry 962 sq. ft.

2. Recommended film thickness 4.0 – 6.0 mils (100-150 microns) dry – 6.7 – 10.00 mils (168 – 250 microns) wet. Direct to metal application requires a dry film thickness of 6 -6 mils (125 – 150 microns)

3. Performance testing data must meet ASTM D4060, D2794, D2485, B117, D 4585, D3359, D 1308, D 2247, and Persoz Pendulum Hardness.

Epoxy Concrete:

Epoxy Resin: The epoxy resin shall meet the requirements of specifications ASTM C 881 for a type 1, grade 2, class B or C or a type 3, grade 2, class B or C epoxy system. In addition it shall be a 100 percent solid system, and no unreactive diluents. Wetting agents, or volatile solvents shall be incorporated.

Preparation of Epoxy Resin:

The epoxy resin is a two-component material which requires a combination of components and mixing prior to use. Once mixed, the material has a limited pot life and must be used immediately. The bonding system shall be prepared by adding the curing compound to the resin compound in proportions recommended by the manufacturer, followed by thorough mixing.

Since the working life of the mixture depends on the temperature (longer at lower temperatures, much shorter at higher temperatures), the quantity to be mixed at one time shall be applied and topped within approximately 30 minutes. The addition of thinner or diluents to the resin mixture will not be permitted.

Application of Epoxy Resin Bond Coat for Surface Repairs:

Immediately after the epoxy resin is mixed, it shall be applied to the prepared, dry existing concrete at a coverage of not more than 80 square feet per gallon, depending on surface conditions.

The area of coverage per gallon of agent depends on the roughness of the surface to be covered and may be considerably less than the maximum specified. The epoxy resin may be applied by any convenient, safe method such as a squeegee, brush, or roller, which will yield an effective coverage, except that spraying of the materials will be permitted only if an efficient airless spray is used and when the concrete surfaces to receive the agent are 70 degrees Fahrenheit or warmer, which spray shall be demonstrated as providing an adequate job with a minimum over spray prior to approval of its use. If spray application is used, the operator shall wear a compressed air-fed hood, and no other personnel shall be closer than 100 feet downwind of the operator when spraying is being performed.

The exposed steel shall be completely coated with epoxy resin at the time it is being applied to the concrete surfaces of the repair area.

The epoxy resin may be allowed to stiffen to a very tacky condition rather than a fluid condition before concrete is placed on steep sloping or vertical surfaces. In the event that the applied film cures beyond the tacky condition before the concrete is placed, a second bond coat shall be applied while the first bond coat is still tacky. If the bond coat has cured beyond the tacky state, it shall be completely removed by sandblasting, and proper cleanup, heating, and drying shall be accomplished, and a new bond coat applied.

Reinforcement:

Comply with Concrete Reinforcing Steel Institute’s recommended practice for placing reinforcing Bars, for details and methods of reinforcement placement and supports as specified.

Clean reinforcement of loose rust and mild scale, earth, and other materials that reduce or destroy bond with concrete. Reinforcing steel bar shall conform to the requirements of ASTM A 615-96a, grade 60.

Curing and Protection:

Per requirements per ACI 318- 1989.

26. SAFETY LADDER REQUIREMENTS:

Contractor shall follow the design for safety ladders which is called out on drawing 1292-303- 60170, any other design must be submitted and approved by the Government.

27. TRAFFIC CONTROL

Traffic control if required, 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.

Submitted traffic control plan must meet all federal, state and local requirements and shall be designed by the Contractor.

28. SAFETY AND HEALTH:

The Contractor shall develop and submit a Health and Safety Plan (HASP), written and implemented for the proposed clearing, grubbing, and demolition operation. The proposed HASP shall be submitted and approved per the requirements of Table 1A (List of Submittals) under the Deliverables section. The program shall identify, evaluate, and control safety and health hazards for clearing operation. The Contractor’s submitted HASP shall be reviewed and approved by the Contracting Officer (CO), and approved by the appropriate State agencies, prior to start of any onsite work. All site workers shall be familiar with the HASP and shall be given training on its contents. The Contractor shall document all training of all site workers in HASP plan. Standards of approval will be determined by compliance with all OSHA regulations.

The Contractor shall be cognizant of and ensure compliance with all requirements of the Bureau of Reclamation Safety and Health Standards, OSHA, and General Industry Safety Regulations.

Such responsibilities shall apply to the Contractor’s operation as well as any subcontractor operations. 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 on site representative will be deemed sufficient. Oral notices will be confirmed to the Contractor in writing by the CO within 7 calendar days.

The Contractor shall indemnify and hold the Government harmless for any and all losses, damages, or liability on account of personal injury, death, or property damage of any nature whatsoever and by whomsoever made, arising out of the activities of the Contractor, employees, subcontractors, or agents under the contract. Such indemnity shall include, but shall not be limited to, failure of the Contractor, employees, subcontractors, or agents to comply with the safety and health provisions contained in these specifications.

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…