Attachment_13_Tom_Way.pdf

1 32 1.3 CY $ $

2 81 1 LS $ XXXXX $

3 200 1 LS $ XXXXX $

4 211 302 CY $ $

5 211 414 CY $ $

6 212 293 CY $ $

7 251 86 LF $ $

8 270 0.3 AC $ $

9 271 0.3 AC $ $

10 275 0.5 AC $ $

11 32 1.2 CY $ $

12 81 1 LS $ XXXXX $

13 200 1 LS $ XXXXX $

14 211 157 CY $ $

15 212 262 CY $ $

16 251 27 LF $ $

17 270 0.3 AC $ $

18 271 0.5 AC $ $

19 275 0.4 AC $ $

Earthfill - Wetland Embankment

Earthfill - Wetland Embankment

Vegetation - Bermudagrass Sprigging

TOM WAY - WRP

TILLMAN COUNTY, FEBRUARY 2010

Estimated Quantity Unit

Unit Price

Total BidSpec.

Supplies or Service

Bid Schedule

DescriptionItem No.

Structural Concrete

Vegetation - Bermudagrass Sprigging

Screw Gate - 12"

Corrugated Metal Pipe Conduit-12" ID

Excavation - Channel

TOTAL - SFWC #2

Excavation - Core Trench

Vegetation-Native Grass Vegetation-Bermudagrass Mulch Sod

Mobilization and Demobilization

Structural Concrete

Vegetation-Bermudagrass Mulch Sod

SFWC #1

Excavation - Core Trench

OFFERER

SFWC #2

Mobilization and Demobilization

Total of all structures

TOTAL - SFWC #1

DUNS #

Screw Gate - 8"

Vegetation-Native Grass

DATE

TAX ID #

Corrugated Metal Pipe Conduit-8" ID

TOM WAY - WRP

TILLMAN COUNTY, FEBRUARY 2010

Specifications Index

Construction Specifications

Concrete /Screw Gate 32 Structural Concrete 34 Steel Reinforcement 81 Metal Fabrication and Installation

Site Preparation 200 Mobilization and Demobilization

Earthwork 211 Excavation 212 Earthfill

Conduits and Drains 251 Corrugated Metal Pipe Conduit

Vegetation 270 Bermudagrass Sprigging 271 Bermudagrass Mulch Sod 275 Seeding 276 Hay Mulch

Material Specifications

Concrete and Components 539 Steel Reinforcement (for Concrete)

Metal Pipe and Components 551 Coated Corrugated Steel Pipe 581 Metal

32–1(210–VI–NEH, January 2009)

1. Scope The work shall consist of furnishing, forming, placing, finishing, and curing portland cement concrete as required to build the structures described in section 24 of this specification.

2. Material Aggregates shall conform to the requirements of Material Specification 522, Aggregates for Portland Cement Con-crete, unless otherwise specified. The grading of coarse aggregates shall be as specified in section 24.

Portland cement shall conform to the requirements of Material Specification 531, Portland Cement, for the speci-fied type.

Fly ash shall conform to the requirements of Material Specification 532, Supplementary Cementitious Materials.

Air-entraining admixtures shall conform to the requirements of Material Specification 533, Chemical Admixtures for Concrete. If air-entraining cement is used, any additional air-entraining admixture shall be of the same type as that in the cement.

Water reducing and/or retarding admixtures shall conform to the requirements of Material Specification 533, Chemical Admixtures for Concrete.

Curing compound shall conform to the requirements of Material Specification 534, Concrete Curing Compound.

Preformed expansion joint filler shall conform to the requirements of Material Specification 535, Preformed Expansion Joint Filler.

Waterstops shall conform to the requirements of Material Specifications 537, Nonmetallic Waterstops, and 538, Metal Waterstops, for the specified kinds.

Water used in mixing and curing concrete shall be clean and free from injurious amounts of oil, salt, acid, alkali, organic matter, or other deleterious substances.

3. Class of concrete Concrete for structure concrete shall be classified as follows:

Class of concrete

Maximum net water content (gal/bag)

Minimum cement content (bags/yd3)

3000M 6 5.5

4000M 6 6

Construction Specification 32—Structure Concrete

32–2 (210–VI–NEH, January 2009)

4. Air content and consistency Unless otherwise specified, the slump shall be 3 to 5 inches. If air entrainment is specified, the air content, by vol-ume, shall be 4 to 7 percent of the volume of the concrete. When specified, directed, or approved by the engineer, a water-reducing, set-retarding, or other admixture shall be used. High range, water reducing agents (superplasticiz-ers) may be used to increase workability, reduce water content, and control concrete temperature in hot weather.

The maximum slump after adding high range water reducing agents shall be 7.5 inches.

5. Design of the concrete mix The proportions of the aggregates shall be such as to produce a concrete mixture that works readily into the cor-ners and angles of the forms and around reinforcement when consolidated, but does not segregate or exude free water during consolidation.

Fly ash may be used as a partial substitution for portland cement in an amount of no more than 25 percent (by weight) of the cement in the concrete mix, unless otherwise specified.

The maximum water to cement ratio shall be 0.5 unless otherwise specified. When more than one cementitious material is used, the maximum water to cementitious materials ratio shall be 0.5 unless otherwise specified.

Before the concrete is placed, the contractor shall furnish the contracting officer, for approval, a statement of the materials and mix proportions (including admixtures, if any) intended for use. The statement shall include evi-dence satisfactory to the contracting officer that the materials and proportions will produce concrete conforming to this specification. The materials and proportions so stated shall constitute the "job mix." After a job mix has been approved, neither the source, character, or grading of the aggregates nor the type or brand of cement or admixture shall be changed without prior notice to the contracting officer. If such changes are necessary, no concrete contain-ing such new or altered material shall be placed until the contracting officer has approved a revised job mix.

6. Inspection and testing The engineer shall have free entry to the plant and equipment furnishing concrete under the contract. Proper facili-ties shall be provided for the engineer to inspect materials, equipment, and processes and to obtain samples of the concrete. All tests and inspections will be conducted so as not to interfere unnecessarily with manufacture and delivery of the concrete.

7. Handling and measurement of material Materials shall be stockpiled and batched by methods that prevent segregation or contamination of aggregates and ensure accurate proportioning of the ingredients of the mix. Except as otherwise provided in section 8, cement and aggregates shall be measured as follows:

Cement shall be measured by weight or in bags of 94 pounds each. When cement is measured in bags, no fraction of a bag shall be used unless weighed.

Aggregates shall be measured by weight. Mix proportions shall be based on saturated, surface-dry weight. The batch weight of each aggregate shall be the required saturated, surface-dry weight plus the weight of surface mois-ture it contains.

Water shall be measured, by volume or by weight, to an accuracy within 1 percent of the total quantity of water required for the batch.

Admixtures shall be measured within a limit of accuracy of 3 percent.

8. Mixers and mixing Concrete shall be uniform and thoroughly mixed when delivered to the work site. Variations in slump of more than 1 inch within a batch are considered evidence of inadequate mixing and shall be corrected by increasing mixing time or other acceptable alternative.

32–3(210–VI–NEH, January 2009)

For stationary mixers, the mixing time after all cement and aggregates are in the mixer drum shall be not less than

1.5 minutes. When concrete is mixed in a truck mixer, the number of revolutions of the drum or blades at mixing speed shall be not less than 70 nor more than l00.

Unless otherwise specified, volumetric batching and continuous mixing at the construction site are permitted. To produce concrete meeting the specified proportioning and uniformity requirements, the batching and mixing equip-ment shall conform to the requirements of ASTM Specification C 685 and shall be demonstrated by tests with the job mix before the concrete is placed. Concrete made by this method shall be produced, inspected, and certified in conformance with sections 6, 7, 8, 13, and 14 of ASTM Specification C 685.

No mixing water in excess of the amount called for by the job mix shall be added to the concrete during mixing or hauling or after arrival at the delivery point.

9. Forms Forms shall be of wood, plywood, steel, or other approved material and shall be mortar tight. The forms and as-sociated falsework shall be substantial and unyielding and shall be constructed so that the finished concrete will conform to the specified dimensions and contours. Form surfaces shall be smooth and free from holes, dents, sags, or other irregularities. Forms shall be coated with a nonstaining form release agent before being set into place.

Metal ties or anchorages within the forms shall be equipped with cones, she-bolts or other devices that permit their removal to a depth of at least 1 inch without injury to the concrete. Ties designed to break off below the surface of the concrete shall not be used without cones.

All edges that will be exposed to view when the structure is completed shall be chamfered, unless finished with molding tools as specified in Section l8.

10. Preparation of forms and subgrade Prior to placement of concrete, the forms and subgrade shall be free of chips, sawdust, debris, water, ice, snow, extraneous oil, mortar, or other harmful substances or coatings and the temperature of all surfaces to be in contact with the new concrete shall be not be less than 40 degrees Fahrenheit. Any oil on the reinforcing steel or other surfaces required to be bonded to the concrete shall be removed. Rock surfaces shall be cleaned by air-water cut-ting, wet sandblasting, or wire brush scrubbing, as necessary, and shall be wetted immediately before placement of concrete. The earth surface shall be firm and damp. Placement of concrete on mud, dried earth, or uncompacted fill or frozen subgrade is not permitted.

Items to be embedded in the concrete shall be positioned accurately and anchored firmly.

Weepholes in walls or slabs shall be formed with nonferrous material.

11. Conveying Concrete shall be delivered to the site and discharged into the forms within l-1/2 hours after the introduction of the cement to the aggregates. In hot weather or under conditions contributing to quick stiffening of the concrete, the time between the introduction of the cement to the aggregates and discharge shall not exceed 45 minutes.

The engineer may allow a longer time, provided the setting time of the concrete is increased a corresponding amount by the addition of an approved set-retarding admixture. In any case, concrete shall be conveyed from the mixer to the forms as rapidly as practicable by methods that prevent segregation of the aggregates and assure no loss of mortar occurs.

32–4 (210-VI-NEH, January 2009)

12. Placing Concrete shall not be placed until the subgrade, forms, steel reinforcement, and embedded items have been in-spected and approved. No concrete shall be placed except in the presence of the engineer. The contractor shall give reasonable notice to the engineer each time concrete is to be placed. Such notice shall provide sufficient time for the engineer to inspect the subgrade, forms, steel reinforcement, and other preparations for compliance with the specifications. Other preparations include, but are not limited to, the concrete mixing plant; delivery equipment system; placing, finishing, and curing equipment and system; schedule of work; workforce; and heating or cooling facilities, if applicable. Deficiencies are to be corrected before concrete is delivered for placing.

The concrete shall be deposited as closely as possible to its final position in the forms. It shall be worked into the corners and angles of the forms and around all reinforcement and embedded items in a manner to prevent segre-gation of aggregates or excessive laitance. Formed concrete shall be placed in horizontal layers not more than 20 inches thick. Concrete shall not be dropped more than 5 feet vertically unless suitable equipment is used to prevent segregation. When high range water reducing agents are used, the concrete shall not be allowed to drop more than 10 feet. Hoppers and chutes, pipes, or "elephant trunks" shall be used as necessary to prevent segregation and the splashing of mortar on the forms and reinforcing steel above the layer being placed.

Immediately after the concrete is placed in the forms, it shall be consolidated by spading, hand tamping, or vibra-tion as necessary to ensure a smooth surface and dense concrete. Each layer shall be consolidated to ensure mono-lithic bond with the preceding layer. If the surface of a layer of concrete in place sets to the degree that it will not flow and merge with the succeeding layer when spaded or vibrated, the contractor shall discontinue placing con-crete and shall make a construction joint according to the procedure specified in section 13.

If placing is discontinued when an incomplete horizontal layer is in place, the unfinished end of the layer shall be formed by a vertical bulkhead.

13. Construction joints Construction joints shall be made at the locations shown on the drawings. If construction joints are needed that are not shown on the drawings, they shall be placed in locations approved by the engineer.

Where a feather edge would be produced at a construction joint, as in the top surface of a sloping wall, an insert form shall be used so that the resulting edge thickness on either side of the joint is not less than 6 inches.

In walls and columns, as each lift is completed, the top surface shall be immediately and carefully protected from any condition that might adversely affect the hardening of the concrete.

Steel tying and form construction adjacent to concrete in place shall not be started until the concrete has cured at least 12 hours. Before new concrete is deposited on or against concrete that has hardened, the forms shall be retightened. New concrete shall not be placed until the hardened concrete has cured at least 12 hours.

The surface of construction joints shall be cleaned of all unsatisfactory concrete, laitance, coatings, or debris by washing and scrubbing with a wire brush or wire broom or by other means approved by the engineer. The surface shall be kept moist for at least 1 hour before the new concrete is placed.

32–5(210-VI-NEH, January 2009)

14. Expansion and contraction joints Expansion and contraction joints shall be made only at locations shown on the drawings.

Exposed concrete edges at expansion and contraction joints shall be carefully tooled or chamfered, and the joints shall be free of mortar and concrete. Joint filler shall be left exposed for its full length with clean and true edges.

Preformed expansion joint filler shall be held firmly in the correct position as the concrete is placed.

When open joints are specified, they shall be constructed by the insertion and subsequent removal of a wooden strip, metal plate, or other suitable template in such a manner that the corners of the concrete are not chipped or broken. The edges of open joints shall be finished with an edging tool before the joint strips are removed.

15. Waterstops Waterstops shall be held firmly in the correct position as the concrete is placed. Joints in metal waterstops shall be soldered, brazed, or welded. Joints in rubber or plastic waterstops shall be cemented, welded, or vulcanized as recommended by the manufacturer.

16. Removal of forms Forms shall not be removed without the approval of the engineer. Forms shall be removed in such a way as to pre-vent damage to the concrete. Supports shall be removed in a manner that permits the concrete to take the stresses of its own weight uniformly and gradually.

17. Finishing formed surfaces Immediately after the forms are removed:

a. All fins and irregular projections shall be removed from exposed surfaces.

b. The holes produced on all surfaces by the removal of form ties, cone-bolts, and she-bolts shall be cleaned, wetted, and filled with a dry-pack mortar. The mortar will consist of one part portland cement, three parts sand that will pass a No. 16 sieve, and just sufficient water to produce a consistency such that the filling is at the point of becoming rubbery when the material is solidly packed.

18. Finishing unformed surfaces All exposed surfaces of the concrete shall be accurately screeded to grade and then float finished, unless specified otherwise.

Excessive floating or troweling of surfaces while the concrete is soft is not permitted.

Adding dry cement or water to the surface of the screeded concrete to expedite finishing is not allowed.

Joints and edges on unformed surfaces that will be exposed to view shall be chamfered or finished with molding tools.

19. Curing Concrete shall be prevented from drying for a curing period of at least 7 days after it is placed. Exposed surfaces shall be kept continuously moist for the entire period, or until curing compound is applied as specified below.

Moisture shall be maintained by sprinkling, flooding, or fog spraying, or by covering with continuously moistened canvas, cloth mats, straw, sand, or other approved material. Wood forms left in place during the curing period shall be kept continuously wet. A formed surface shall be thoroughly wetted immediately after forms are removed and

32–6 (210-VI-NEH, January 2009) shall be kept wet until patching and repairs are completed. Water or covering shall be applied in such a way that the concrete surface is not eroded or otherwise damaged.

Concrete, except at construction joints, may be coated with the approved curing compound instead of continued application of moisture, except as otherwise specified in section 24. The compound shall be sprayed on the moist concrete surface as soon as free water has disappeared, but shall not be applied to any surface until patching, re-pairs, and finishing of that surface are completed. The compound shall be applied at a uniform rate of not less than 1 gallon per 175 square feet of surface and shall form a continuous adherent membrane over the entire surface.

Curing compound shall be thoroughly mixed before applying and continuously agitated during application. Curing compound shall not be applied to a surface requiring bond to subsequently placed concrete, such as construction joints, shear plates, reinforcing steel, and other embedded items. If the membrane is damaged during the curing period, the damaged area shall be resprayed at the rate of application specified above. Any surface covered by the membrane shall not be trafficked unless protected from wear.

20. Removal and replacement or repair When concrete is honeycombed, damaged, or otherwise defective, the contractor shall remove and replace the structure or structural member containing the defective concrete or, where feasible, correct or repair the defective parts. The contracting officer determines the required extent of removal, replacement, or repair. Before starting re-pair work, the contractor shall obtain the contracting officer's approval of the plan for repairs. The contractor shall perform all repair work in the presence of the engineer.

21. Concreting in cold weather Concrete shall not be mixed nor placed when the daily minimum atmospheric temperature is less than 40 degrees Fahrenheit unless facilities are provided to prevent the concrete from freezing. The use of accelerators or anti-freeze compounds is not allowed.

22. Concreting in hot weather The contractor shall apply effective means to maintain the temperature of the concrete below 90 degrees Fahren-heit during mixing, conveying, and placing.

23. Measurement and payment For items of work for which specific unit prices are established in the contract, concrete is measured to the neat lines shown on the drawings and the volume of concrete is computed to the nearest 0.l cubic yard. Measurement of concrete placed against the sides of an excavation without using intervening forms is made only to the neatness or pay limits shown on the drawings. No deduction in volume is made for chamfers, rounded or beveled edges, or for any void or embedded item that is less than 5 cubic feet in volume.

Payment for each item of structure concrete is made at the contract unit price or the contract lump sum; whichever is applicable for that item. Such payment constitutes full compensation for all labor, material, equipment, transpor-tation, tools, forms, falsework, bracing, and all other items necessary and incidental to the completion of the work except items listed for payment elsewhere in the contract. Compensation for any item of work described in the contract, but not listed in the bid schedule, is included in the payment for the item of work to which it is made sub-sidiary. Such items and the items to which they are made subsidiary are identified in section 24 of this specification.

24. Items of work and construction details

NRCS-OKLA 32-7 February 2010 Tom Way - WRP Tillman County

24. ITEMS OF WORK AND CONSTRUCTION DETAILS

Items of work to be performed in conformance with this specification and the construction details are:

a. Bid Items 1, and 11, Structural Concrete

(1) This item consists of the furnishing, forming, placing, finishing and curing of concrete as required to complete the anchors for SFWC #1 and #2 as shown in the drawings.

(2) All concrete shall be Class 3000M.

(3) Curing compound shall be white pigmented.

(4) Materials used for reinforcement steel shall be #4 steel bars and must conform to

Construction Specification - 34 Steel Reinforcement.

(5) Measurement and Payment shall be as specified in Section 23 of this specification.

(6) Items of work subsidiary to this bid item are:

(a) Steel Reinforcement – Construction Specification 34

34–1(210–VI–NEH, January 2009)

1. Scope The work shall consist of furnishing and placing steel reinforcement for reinforced concrete or pneumatically ap-plied mortar.

2. Material Steel reinforcement shall conform to the requirements of Material Specification 539, Steel Reinforcement (for con-crete). Before reinforcement is placed, the surface of the bars and fabric and any metal supports shall be cleaned to remove any loose, flaky rust, mill scale, oil, grease, or other undesirable coatings or foreign substances. Epoxy-coated steel reinforcement shall be free of surface damage. After placement, the reinforcement shall be maintained in a clean and serviceable condition until it is completely embedded within the concrete.

3. Bar schedule, lists and diagrams Any supplemental bar schedules, bar lists or bar-bending diagrams required in section 10 of this specification to accomplish the fabrication and placement of steel reinforcement shall be provided by the contractor. Before rein-forcement is placed, the contractor shall furnish four copies of any such lists or diagrams to the contracting officer for approval. Acceptance of the reinforcement is not based on approval of these lists or diagrams, but on inspec-tion of the steel reinforcement after it has been placed, tied, and supported and is ready to receive concrete.

4. Bending Reinforcement shall be cut and bent in compliance with the requirements of the American Concrete Institute Standard 315. Bars shall not be bent or straightened in a manner that will injure or weaken the material. Bars with kinks, cracks, or improper bends will be rejected.

5. Splicing bar reinforcement Method 1—Splices of reinforcement shall be made only at locations shown on the drawings and provided by the steel schedule. Placement of bars at the lap splice locations shown, when not in contact, shall not be farther apart than one-fifth the shown lap length and in any case no greater than 6 inches.

Method 2—Splices of reinforcement shall be limited to those locations shown on the drawings. Splice lengths shall be determined before fabrication and meet the requirements of ACI Standard 318, Building Code Require-ments for Reinforced Concrete, based upon design information in section 10 of this specification. Bar placement drawings and schedules shall be provided for approval before fabrication. The drawings shall show all splice loca-tions, layouts, and lap dimensions.

6. Splicing welded wire reinforcement Unless otherwise specified, welded wire reinforcement shall be spliced in the following manner:

End-to-end—Adjacent sections shall be spliced end-to-end (longitudinal lap) by overlapping a minimum of one full mesh plus 2 inches plus the length of the two end overhangs. The splice length is measured from the end of the longitudinal wires in one piece of fabric to the end of the longitudinal wire in the lapped piece of fabric.

Side-to-side—Adjacent sections shall be spliced side to side (transverse lap) a minimum of one full mesh plus 2 inches. The splice length shall be measured from the centerline of the first longitudinal wire in one piece of fabric to the centerline of the first longitudinal wire in the lapped piece of fabric.

Construction Specification 34—Steel Reinforcement

34–2 (210–VI–NEH, January 2009)

7. Placing Reinforcement shall be accurately placed and secured in position to prevent its displacement during the placement of concrete. Tack welding of bars is not permitted. Metal chairs, metal hangers, metal spacers, and concrete chairs may be used to support the reinforcement. Metal hangers, spacers, and ties shall be placed in such a manner that they are not exposed in the finished concrete surface. The legs of metal chairs or side form spacers that may be exposed on any face of slabs, walls, beams, or other concrete surfaces shall have a protective coating or finish. The coating or finish can be hot dip galvanizing, epoxy coating, plastic coating, or stainless steel. Metal chairs and spac-ers not fully covered by a protective coating or finish shall have a minimum cover of 0.75 inch of concrete over the unprotected metal part. The exception is that those with plastic coatings may have a minimum cover of 0.5 inch of concrete over the unprotected metal part. Precast concrete chairs shall be manufactured of the same class of con-crete as specified for the structure and shall have the tie wires securely anchored in the chair or a V-shaped groove at least 0.75 inch in depth molded into the upper surface to receive the steel bar at the point of support. Precast concrete chairs shall be clean and moist at the time concrete is placed.

High density or structural plastic rebar accessories designed to ensure maximum concrete bond may be substi-tuted for metal or concrete accessories in spacer applications as approved by the contracting officer. Exposure of plastic rebar accessories at the finished concrete surface shall be kept to a minimum. Plastic rebar accessories, when used, shall be staggered along adjacent parallel bars and shall be placed at intervals no closer than 12 inches.

Plastic rebar accessories shall not be used in concrete sections 6 inches or less in thickness.

Reinforcement shall not be placed until the prepared site has been inspected and approved. After placement of the reinforcement, concrete shall not be placed until the reinforcement has been inspected and approved by the con-tracting officer's technical representative (COTR).

8. Storage Steel reinforcement stored at the work site shall be placed on platforms, skids, or other supports. This is done so that contact with the ground is avoided and the material is protected from mechanical damage and/or corrosion.

9. Measurement and payment Method 1—For items of work for which specific unit prices are established in the contract, the weight of steel re-inforcement placed in the concrete in accordance with the drawings is determined to the nearest pound by compu-tation from the placing drawings. Measurement of hooks and bends is based on the requirements of ACI Standard

315. Computation of weights of reinforcement is based on the unit weights established in tables 34–1 and 34–2 of this specification. Computation of weights for welded wire reinforcement not shown in table 34–2 shall be based on ACI Standard 315. The area of welded wire reinforcement placed in the concrete in accordance with the drawings is determined to the nearest square foot by computation from the placing drawings with no allowance for required laps. The weight of steel reinforcing in extra splices or extra-length splices approved for the convenience of the contractor or the weight of supports and ties is not included in the measurement for payment.

Payment for furnishing and placing reinforcing steel is made at the contract unit price. Such payment constitutes full compensation for all labor, material, equipment, and all other items necessary and incidental to the completion of the work including preparing and furnishing bar schedules, lists, or diagrams; furnishing and attaching ties and supports; and furnishing, transporting, storing, cutting, bending, cleaning, and securing all reinforcements.

34–3(210–VI–NEH, January 2009)

Method 2—For items of work for which specific unit prices are established in the contract, the weight of bar rein-forcement placed in the concrete in accordance with the drawings is determined to the nearest pound by computa-tion from the placing drawings. Measurement of hooks and bends is based on the requirements of ACI Standard

315. Computation of weights of bar reinforcement is based on the unit weights established in table 34–1 of this specification. The weight of steel reinforcing in extra splices or extra length splices approved for the convenience of the contractor or the weight of supports and ties is not included in the measurement for payment.

The area of welded wire reinforcement placed in the concrete in accordance with the drawings is determined to the nearest square foot by computation from the placing drawings with no allowance for required laps.

Payment for furnishing and placing bar reinforcing steel is made at the contract unit price for bar reinforcement.

Payment for furnishing and placing welded wire reinforcing steel is made at the contract unit price for welded wire reinforcement. Such payment constitutes full compensation for all labor, material, equipment, and all other items necessary and incidental to the completion of the work including preparing and furnishing bar schedules, lists, or diagrams; furnishing and attaching ties and supports; and furnishing, transporting, cutting, bending, cleaning, and securing all reinforcement.

All Methods—The following provisions apply to all methods of measurement and payment. Compensation for any item of work described in the contract, but not listed in the bid schedule, is included in the payment for the item of work to which it is made subsidiary. Such items to which they are made subsidiary are identified in section 10 of this specification.

Table 34–1 Standard reinforcing bars

- - Bar size designations - - Weight (lb/ft)

English Metric

3 10 0.376

4 13 0.668

5 16 1.043

6 19 1.502

7 22 2.044

8 25 2.670

9 29 3.400

10 32 4.303

11 36 5.313

14 43 7.650

18 57 13.600

1/ The bar diameter (inches) equals the bar size number divided by eight. For example, the diameter of a #4 bar is 4÷8 = 0.5 inch.

2/ The metric bar size has been rounded to a whole number that represents the approximate diameter of the bar in millime-ters.

Table 34–2 Rectangular welded wire reinforcement

- - - - - - - - - - Style designation 1/ - - - - - - - - - - Weight by W-number by steel wire gauge (former designation)

(lb/100 ft2)

6 × 6 – W1.4 × W1.4 6 × 6 – 10 × 10 21

6 × 6 – W2.1 × W2.1 6 × 6 – 8 × 8 30

6 × 6 – W2.9 × W2.9 6 × 6 – 6 × 6 42

6 × 6 – W4.0 × W4.0 6 × 6 – 4 × 4 58

4 × 4 – W1.4 × W1.4 4 × 4 – 10 × 10 31

4 × 4 – W2.1 × W2.1 4 × 4 – 8 × 8 44

4 × 4 – W2.9 × W2.9 4 × 4 – 6 × 6 62

4 × 4 – W4.0 × W4.0 4 × 4 – 4 × 4 85

4 × 12 – W2.1 × W0.9 2/ 4 × 12 – 8 × 12 25

4 × 12 – W2.5 × W1.1 2/ 4 × 12 – 7 × 11 31

1/ Style designation is defined in ACI Standard 315 of the American Concrete Institute.

2/ Welded smooth wire reinforcement with wires smaller than size W1.4 is manufactured from galvanized wire.

NRCS-OKLA 34-4 February 2010

10. ITEMS OF WORK AND CONSTRUCTION DETAILS

a. Subsidiary Item, Steel Reinforcement

(1) This item consists of furnishing and placing steel reinforcement material for the concrete to construct the anchor for SFWC #1 and #2 as shown in the drawings.

(2) No separate payment will be made for Steel Reinforcement. Compensation for this item will be included in the payment for Bid Items 1 and 11, Structural Concrete.

(210-VI-NEH, May 2001) 81–1

Construction Specification 81—Metal Fabrication and Installation

1. Scope The work consists of furnishing, fabricating, and erecting metalwork, including the metal parts and fasteners of the composite structures.

2. Material Unless otherwise specified, material shall conform to the requirements of Material Specification 581, Metal. Steel shall be structural quality unless otherwise specified. Castings shall be thoroughly cleaned and subjected to careful inspection before installation. Finished surfaces shall be smooth and true to assure proper fit. Galvanizing shall conform to the requirements of Material Specification 582, Galvaniz-ing.

3. Fabrication Fabrication of structural steel shall conform to the requirements of Specification for the Design, Fabri-cation and Erection of Structural Steel for Buildings (Riveted, Bolted and Arc-Welded Construction), American Institute of Steel Construction.

Fabrication of structural aluminum shall conform to the requirements in the Aluminum Design Manual available from The Aluminum Association.

4. Erection The frame of metal structures shall be installed true and plumb. Temporary bracing shall be placed wher-ever necessary to resist all loads to which the structure may be subjected, including those applied by the installation and operation of equipment. Such bracing shall be left in place as long as may be necessary for safety.

As erection progresses the work shall be securely bolted up, or welded, to resist all dead load, wind, and erection stresses. The contractor shall furnish such installation assisting bolts, nuts, and washers as may be required.

No riveting or welding shall be performed until the structure is stiffened and properly aligned.

Rivets driven in the field shall be heated and driven with the same care as those driven in the shop.

All field welding shall be performed in conformance to the requirements for shop fabrication except those that expressly apply to shop conditions only.

5. Protective coatings Items specified to be galvanized shall be completely fabricated for field assembly before the application of the zinc coatings. Galvanized items shall not be cut, welded, or drilled after the zinc coating is applied.

Items specified to be painted shall be painted in conformance to the requirements of Construction Speci-fication 82 for the specified paint systems.

(210-VI-NEH, May 2001)81–2

6. Measurement and payment Method 1—The work is not measured. Payment for metal fabrication and installation is made at the contract lump sum price in the contract. Such payment constitutes full compensation for all labor, equip-ment, material, and all other items necessary and incidental to the completion of the work including connectors and appurtenances, such as rivets, bolts, nuts, pins, studs, washers, hangers, and weld metal.

Method 2—The weight of metal installed complete in place shall be determined to the nearest pound.

Unless otherwise specified, the weight of metal shall be computed by the method specified in section 3 of the Code of Standard Practice for Steel Buildings and Bridges, American Institute of Steel Construc-tion, except that the following unit weights shall also be used, as appropriate, as the basis of computa-tion:

Material Unit weight (lb/ft3)

Aluminum alloy 173

Bronze or copper alloy 536

Iron, malleable 470

Iron, wrought 487

Payment for furnishing, fabricating, and installing metalwork is made at the contract unit price for the specified types of labor, material, equipment, and all other items necessary and incidental to the comple-tion of the work.

Method 3—The work is not measured. Payment for furnishing, fabricating, and installing each item of metalwork is made at the contract price for that item. Such payment constitutes full compensation for all labor, equipment, material, and all other items necessary and incidental to the completion of the work including connectors and appurtenances, such as rivets, bolts, nuts, pins, studs, washers, hangers, and weld metal.

All methods—The following provisions apply to all methods of measurement and payment. Compensa-tion for any item of work described in the contract, but not listed in the bid schedule, is included in the payment for the item of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in section 7 of this specification.

7. Items of work and construction details

NRCS-OKLA 81-3 February 2010

7. ITEMS OF WORK AND CONSTRUCTION DETAILS

a. Bid Items 2 and 12, Screw Gate

(1) This item consists of furnishing, fabricating, and installing the screw gates and associated components for the water control structures to the sizes and dimensions shown on the drawings.

(2) Screw gate frame, assembly bolts and stem shall be made of stainless steel.

(3) Screw gates shall be installed according to the drawings and the manufacturer’s recommendations.

(4) Measurement and Payment will be by Method 3

b. Subsidiary Item, Debris Guard

(1) This item consists of furnishing, fabricating, and installing the trash guard for the inlet of the water control structures to the sizes and dimensions shown on the drawings.

(2) The trash guard shall be made from materials as specified in the drawings.

(3) No separate payment will be made for Debris Guard. Compensation will be included in the payment for Bid Items 7 and 16, Corrugated Metal Pipe

CONSTRUCTION SPECIFICATION

200. MOBILIZATION/DEMOBILIZATION

1. SCOPE

The work shall consist of the mobilization and demobilization of the contractor's forces and equipment necessary for performing the work required under the contract.

2. WORK ITEMS

Mobilization/demobilization shall consist of the following:

a. Premiums paid for performance and payment bonds, including coinsurance and reinsurance agreements.

b. Transportation of personnel and equipment to and from the site.

c. Establishment and disassembly/removal of offices, buildings, storage facilities, sanitary facilities, utility service, and other necessary facilities at the site not covered in specific bid items.

d. Establishment of ingress-egress routes not covered in specific bid items.

e. Other items as specified in Section 4 of this specification.

3. MEASUREMENT AND PAYMENT

For items of work for which specific lump sum prices are established in the contract, the quantity of mobilization will not be measured for payment.

Progress payments will be made only to the extent supported by invoice. If the total of such payments is less than the contract lump sum for mobilization, the unpaid balance will be included in the final contract payment. Total payment will be the lump sum contract price for mobilization, regardless of actual cost to the contractor.

Payment will not be made under this item for the purchase costs of materials having a residual value.

Payment of the lump sum contract price for mobilization will constitute full compensation for all labor, materials, equipment, and all other items necessary and incidental to completion of the work.

Compensation for any item of work described in the contract but not listed in the bid schedule will be included in the payment for the item of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in Section 4 of this specification

NRCS-1/06 200-1

OKLAHOMA

NRCS-OKLA 200-2 February 2010

4. ITEMS OF WORK AND CONSTRUCTION DETAILS

a) Bid Items 3 & 13, Mobilization and Demobilization

(1) This item consists of the mobilization and demobilization of the contractor's forces and equipment necessary for performing the work required under this contract.

(2) This item also consists of stabilizing, maintaining, and restoring the ingress-egress road. The ingress-egress road shall be restored back to a condition “as-good-as” or better than it was prior to the start of construction. Before any equipment, supplies, personnel, or any other items required for the execution of work is moved on the project area, there will be a mutual agreement between the Contracting Officer’s Technical Representative and the contractor pertaining to ingress-egress, parking area, and headquarters of the contractor on the site.

(3) The contractor shall be responsible for identifying the location of utilities prior to construction activities and shall notify the Oklahoma One-Call System at least 48 hours prior to starting work at the project site. If any unidentified utilities are encountered after work is initiated, the contractor shall discontinue work and notify the contracting officer immediately.

(4) This item shall also include the securing of any bonds or payment protection, and payment for such, as required by the Contracting Officer under the terms of this contract.

(5) Payment will be made as the work proceeds, after presentation of paid invoices and/or documentation of direct costs by the Contractor showing specific mobilization and demobilization costs and supporting evidence of the charges of suppliers, subcontractors, and others. When the total of such payments is less than the lump sum contract, the balance remaining will be included in the final contract payment. Payment of the lump sum contract price for mobilization and demobilization will constitute full compensation for the completion of the work.

(6) Due to the Oklahoma Administrative Rule OAC 35: 30-13-3 and the Federal

Regulation 7 CFR 301.81 quarantine for imported fire ants, Solenopsis invicta, all soil moving equipment shall be properly washed and/or otherwise sanitized to remove any and all soil material from the equipment, before mobilizing to the job site(s) and demobilizing from the job site(s).

211. EXCAVATION

The work shall consist of the excavation required by the drawings and specifications and disposal of the excavated materials.

2. CLASSIFICATION

Excavation shall include all materials encountered regardless of their nature or the manner in which they are removed.

3. BLASTING

The transportation, handling, storage, and use of dynamite and other explosives shall be directed and supervised by a person of proven experience and ability in blasting operations.

Blasting shall be done in such a way as to prevent damage to the work or unnecessary fracturing of the foundation and shall conform to any special requirements in Section 11 of this specification.

4. USE OF EXCAVATED MATERIALS

To the extent they are needed, all suitable materials from the specified excavations shall be used in the construction of required permanent earthfill or rockfill. The suitability of materials for specific purposes will be determined by the contracting officer representative. The contractor shall not waste or otherwise dispose of suitable excavated materials.

5. DISPOSAL OF WASTE MATERIALS

All surplus or unsuitable excavated materials will be designated as waste and shall be disposed of at the locations shown on the drawings.

6. BRACING AND SHORING

Excavated surfaces too steep to be safe and stable if unsupported shall be supported as necessary to safeguard the work and workmen, to prevent sliding or settling of the adjacent ground, and to avoid damaging existing improvements. The width of the excavation shall be increased if necessary to provide space for sheeting, bracing, shoring, and other supporting installations. The contractor shall furnish, place, and subsequently remove such supporting installations.

7. STRUCTURE AND TRENCH EXCAVATION

Structure or trench excavation shall be completed to the specified elevations and to sufficient length and width to include allowance for forms, bracing and supports, as necessary, before any concrete or earthfill is placed or any piles are driven within the limits of the excavation.

NRCS-1/06 211-1

8. BORROW EXCAVATION

When the quantities of suitable materials obtained from specified excavations are insufficient to construct the specified fills, additional materials shall be obtained from the designated borrow areas. The extent and depth of borrow pits within the limits of the designated borrow areas shall be as directed by the contracting officer’s representative.

Borrow pits shall be excavated and finally dressed in a manner to eliminate steep or unstable side slopes or other hazardous or unsightly conditions.

9. OVEREXCAVATION

Excavation in rock beyond the specified lines and grades shall be corrected by filling the resulting voids with portland cement concrete made of materials and mix proportions approved by the contracting officer representative. Concrete that will be exposed to the atmosphere when construction is completed shall contain not less than 6 sacks of cement per cubic yard of concrete.

Concrete that will be permanently covered shall contain not less than 4 1/2 sacks of cement per cubic yard. The concrete shall be placed and cured as specified by the contracting officer’s representative.

Excavation in earth beyond the specified lines and grades shall be corrected by filling the resulting voids with approved compacted earthfill, except that, if the earth is to become the subgrade for riprap, rockfill, sand or gravel bedding, or drainfill, the voids may be filled with material conforming to the specifications for the riprap, rockfill, bedding, or drainfill.

10. MEASUREMENT AND PAYMENT

For items of work for which specific unit prices are established in the contract, the volume of each type of excavation within the specified pay limits will be measured and computed to the nearest cubic yard by the method of average cross-sectional end areas. Regardless of quantities excavated, the measurement for payment will be made to the specified pay limits, except that excavation outside the specified lines and grades directed by the contracting officer representative to remove unsuitable material will be included. Excavation required because unsuitable conditions result from the contractor's improper construction operations, as determined by the contracting officer, will not be included for measurement and payment.

The pay limits shall be defined as follows:

a. The upper limit shall be the original ground surface as it existed prior to the start of construction operations except that where excavation is performed within areas designated for previous excavation or fill. In areas of previous excavation or fill, the upper limit shall be the modified ground surface resulting from the specified previous excavation or fill.

b. The lower and lateral limits shall be the neat lines and grades shown on the drawings.

Payment for each type of excavation will be made at the contract unit price for that type of excavation. Such payment will constitute full compensation for all labor, materials, equipment, and all other items necessary and incidental to the performance of the work, except that extra payment for backfilling overexcavation will be made in accordance with the following provisions:

NRCS-1/06 211-2

Payment for backfilling overexcavation, as specified in Section 9 of this specification, will be made only if the excavation outside specified lines and grades is directed by the contracting officer representative to remove unsuitable material and if the unsuitable condition is not a result of the contractor's improper construction operations as determined by the contracting officer.

Compensation for any item of work described in the contract but not listed in the bid schedule will be included in the payment for the item of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in Section 11 of this specification.

NRCS-1/06 211-3

NRCS-OKLA 211-4 February 2010

Tillman County

11. ITEMS OF WORK AND CONSTRUCTION DETAILS

a. Bid Items 4 and 14, Excavation – Core Trench

(1) This item consists of the excavation of the core trench and pipe foundation for

SFWC #1 and #2 as shown on the drawings.

(2) Foundation excavation and other parts of the construction site that are to be stripped and backfilled shall be dewatered and kept free of standing water.

(3) Measurement and payment shall be as specified in Section 10 of this specification.

b. Bid Item 5, Excavation – Channel

(1) This item consists of the excavation of the outlet channel as shown on the drawings for SFWC #1. The excavated material shall be used for the fill material of the SFWC #1 embankment permitting it is suitable as determined by the engineer. Excess excavated material shall be placed in the designated areas as specified in the drawings.

(2) Measurement and payment shall be as specified in Section 10 of this

c. Subsidiary Item, Excavation – Auxiliary Spillway

(1) This item consists of the excavation required to construct the auxiliary spillways.

Excavated material shall be used for the embankment fill.

(2) No separate payment will be made for Excavation – Auxiliary Spillway.

Compensation for this will be included in Bid Items 6 and 15 Earthfill.

212. EARTHFILL

The work consists of the construction of earth embankments and other earthfills required by the drawings and specifications.

2. MATERIALS

All fill materials shall be obtained from required excavations and designated borrow areas. The selection, blending, routing, and disposition of materials in the various fills shall be subject to approval by the contracting officer representative.

Fill materials shall be reasonably free of sod, brush, roots, frozen material, or other perishable materials. Except for rock fills, rock particles larger than 6-inch diameter for material place in 10-inch layers shall be removed prior to compaction of the fill.

Topsoil shall consist of friable surface soil reasonably free of grass, roots, weeds, sticks, stones, or other foreign materials.

The types of materials used in the various fills shall be as listed and described in the…