O RRanchWRP_ConstructionSpecifications_REV2016.pdf

O & R RANCH WRP PROJECT

POTTAWATOMIE COUNTY 2016

SPECIFICATION INDEX

CONSTRUCTION SPECIFICATIONS

07-CONSTRUCTION SURVEYS

11-REMOVAL OF WATER

32-STRUCTURE CONCRETE

52-STEEL PIPE

81-METAL FABRICATION

200-MOBILIZATION

201-CLEARING

202-DEBRIS AND/OR STRUCTURE REMOVAL

211-EXCAVATION

212-EARTHFILL

226-TOPSOIL

244-CORRUGATED POLYETHYLENE TUBING

271-BERMUDAGRASS MULCH SOD

275-SEEDING

280-PLANTING TEMPORARY COVER CROP

MATERIAL SPECIFICATIONS

FIBER REINFORCED CONCRETE

522-AGGREGATES FOR PORTLAND CEMENT

531-PORTLAND CEMENT

532-SUPPLEMENTARY CEMENTITIOUS MATERIALS

533-CHEMICAL ADMIXTURES FOR CONCRETE

534-CONCRETE CURING COMPOUND

554-STEEL PIPE

571-SLIDE GATES

581-METAL

582-GALVANIZING

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(210-VI-NEH, January 2009) 7-1

Construction Specification 7—Construction Surveys

1. Scope The work consists of performing all surveys, measurements, and computations required by this specification.

2. Equipment and material Equipment for construction surveys shall be of a quality and condition to provide the required accuracy. The equipment shall be maintained in good working order and in proper adjustment at all times. Records of repairs, calibration tests, accuracy checks, and adjustments shall be maintained and be available for inspection by the engineer. Equipment shall be checked, tested, and adjusted as necessary in conformance with manufacturer's recommendations.

Material is field notebooks, stakes, templates, platforms, equipment, spikes, steel pins, tools, and all other items necessary to perform the work specified.

3. Quality of work All work shall follow recognized professional practice and the standards of the industry unless otherwise specified in section 9 of this specification. The work shall be performed to the accuracy and detail appropriate for the type of job. Notes, sketches, and other data shall be complete, recorded neatly, legible, reproducible and organized to facilitate ease in review and allow reproduction of copies for job documentation. Survey equipment that requires little or no manual recording of field data shall have survey information documented as outlined in section 9 of this specification.

All computations shall be mathematically correct and shall include information to identify the bid item, date, and who performed, checked, and approved the computations. Computations shall be legible, complete, and clearly document the source of all information used including assumptions and measurements collected.

If a computer program is used to perform the computations, the contractor shall provide the engineer with the software identification, vendor's name, version number, and other pertinent data before beginning survey activities.

Computer generated computations shall show all input data including values assigned and assumptions made.

The elevations of permanent and temporary bench marks shall be determined and recorded to the nearest 0.01 foot.

Differential leveling and transit traverses shall be of such precision that the error of vertical closure in feet shall not exceed plus or minus 0.1 times the square root of the traverse distance in miles. Linear measurements shall be accurate to within 1 foot in 5,000 feet, unless otherwise specified in section 9 of this specification. The angular error of closure for transit traverses shall not exceed 1 minute times the square root of the number of angles turned.

The minimum requirements for placing slope stakes shall be at 100-foot stations for tangents, as little as 25 feet for sharp curves, breaks in the original ground surface and at any other intermediate stations necessary to ensure accurate location for construction layout and measurement. Slope stakes and cross sections shall be perpendicular to the centerline. Significant breaks in grade shall be determined for cross sections. Distances shall be measured horizontally and recorded to the nearest 0.1 foot. Side shots for interim construction stakes may be taken with a hand level.

Unless otherwise specified in section 9 of this specification, measurements for stationing and establishing the location of structures shall be made to the nearest 0.1 foot.

Elevations for concrete work, pipes, and mechanical equipment shall be determined and recorded to the nearest 0.01 foot. Elevations for earth work shall be determined and recorded to the nearest 0.1 foot.

4. Primary control The baselines and bench marks for primary control, necessary to establish lines and grades needed for construction, are shown on the drawings and have been located on the job site.

7-2 (210-VI-NEH, January 2009)

These baselines and bench marks shall be used as the origin of all surveys, layouts, and measurements to establish construction lines and grades. The contractor shall take all necessary precautions to prevent the loss or damage of primary control points. Any stakes or control points lost or damaged by construction activity will be reestablished by the contractor or at contractor expense.

5. Construction surveys Before work starts that requires contractor performed surveys, the contractor shall submit in writing for the engineer's review: the name, qualifications, and experience of the individuals to be assigned to the survey tasks.

Method 1—Contractor performed surveys shall include:

• checking and any supplemental or interim staking

• performing quantity surveys, measurements, and computations for progress payment

• other surveys as described in section 9 of this specification

Method 2—Contractor performed surveys shall consist of all work necessary for:

• establishing line and grade for all work

• setting slope stakes for all work

• checking and any supplemental or interim staking

• establishing final grade stakes

• performing quantity surveys, measurements, and computations for progress payment

• other surveys as described in section 9 of this specification

Method 3—Contractor performed surveys shall consist of all work necessary for:

• establishing line and grade for all work

• setting slope stakes for all work

• checking and any supplemental or interim staking

• establishing final grade stakes

• performing quantity surveys, measurements, and computations for progress payments

• performing original (initial) and final surveys for determinations of final quantities

• other surveys as described in section 9 of this specification.

6. Staking The construction staking required for the item shall be completed before work on any item starts. Construction staking shall be completed as follows or as otherwise specified in section 9 of this specification:

Clearing and grubbing—The boundary of the area(s) to be cleared and grubbed shall be staked or flagged at a maximum interval of 200 feet, closer if needed, to clearly mark the limits of work. When contractor staking is the basis for determining the area for final payment, all boundary stakes will be reviewed by the engineer before start of this work item.

Excavation and fill—Slope stakes shall be placed at the intersection of the specified slopes and ground line. Slope stakes and the reference stakes for slopes shall be marked with the stationing, required cut or fill, slope ratio, and horizontal distance from the centerline or other control line. The minimum requirements for placing slope stakes is outlined in section 3, Quality of work.

(210-VI-NEH, January 2009) 7-3

Structures—Centerline and offset reference line stakes for location, alignment, and elevation shall be placed for all structures.

7. Records All survey data shall be recorded in fully identified standard hard-bound engineering survey field notebooks with consecutively numbered pages. All field notes and printed data shall include the purpose or description of the work, the date the work was performed, weather data, sketches, and the personnel who performed and checked the work.

Electronically generated survey data and computations shall be bound, page numbered, and cross referenced in a bound field notebook containing the index for all survey activities. All work shall follow recognized professional practice.

The construction survey records shall be available at all times during the progress of the work for examination and use by the engineer and when requested, copies shall be made available. The original field notebooks and other records shall be provided to and become the property of the owner before final payment and acceptance of all work.

Complete documentation of computations and supporting data for progress payments shall be submitted to the engineer with each invoice for payment as specified in section 9 of the specification. When the contractor is required to conduct initial and final surveys as outlined in section 5, Construction Surveys, notes shall be provided as soon as possible after completion to the engineer for the purpose of determining final payment quantities.

8. Payment Method 1—For items of work for which lump sum prices are established in the contract, payment is made as the work proceeds, after presentation of correct and accurate invoices by the contractor showing related costs and evidence of the charges of suppliers, subcontractors, and others for supplies furnished and work performed. Invoices for the total amount of the contract price will not be accepted until all surveys are complete and required documentation has been determined complete. If the total of such payments is less than the lump sum contract price for this item, the unpaid balance will be included in the final contract payment. Payment of the lump sum contract price will constitute full compensation for completion of all work under the bid item.

Method 2—For items of work for which lump sum prices are established in the contract, payment is made as the work proceeds with progress payment amounts determined as a percentage of the total work planned as projected from the contractor's approved construction schedule. Payment of the lump sum contract price will constitute full compensation for completion of all work under this bid item.

All Methods—Payment will not be provided under this item for the purchase price of materials or equipment having a residual value.

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 item to which they are made subsidiary are identified in section 9 of this specification.

7-4 (210-VI-NEH, January 2009)

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NRCS – 05/14

OK – O&R Ranch WRP 7-5

9. ITEMS OF WORK AND CONSTRUCTION DETAILS

The primary control as shown in Section 4 and the staking as described in Section 6 will be provided by the government.

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

a. Subsidiary Item, Construction Surveys

(1) This item consists of the performing surveys necessary to establish location, line, and grade for all structures, and to maintain construction control.

(2) Construction Surveys will be by Method 1.

(3) Contractor survey shall also consist of:

(a) Re-staking any original government layout or references that are removed or destroyed.

(4) The government will do the following construction survey duties:

(a) Perform original (initial) staking survey operations

(b) Perform quantity surveys, measurements, and computations for progress payments

(c) Perform final survey operations

(5) No separate payment will be made for Construction Surveys.

Compensation will be included in the payment for Bid Items, 18 Inch Steel Pipe, Access Road #1, Access Road #2, HDPE with Inline Water Control Structures, Wetland Embankments, and Excavated Swales, as the case may be.

NRCS – 05/14

OK – O&R Ranch WRP 7-6

(210-VI-NEH, May 2001)

Construction Specification 11—Removal of Water

1. Scope The work consists of the removal of surface water and ground water as necessary to perform the con-struction required by the contract in accordance with the specifications. It shall include: (1) construct-ing, installing, building, and maintaining all necessary temporary water containment facilities, channels, and diversions; (2) furnishing, installing, and operating all necessary pumps, piping, and other facilities and equipment; and (3) removing all such temporary works and equipment after their intended function is no longer required.

2. Diverting surface water The contractor shall install, maintain, and operate all cofferdams, channels, flumes, sumps, and all other temporary diversion and protective works needed to divert streamflow and other surface water through or around the construction site. Control of surface water shall be continuous during the period that damage to construction work could occur. Unless otherwise specified and/or approved, the diversion outlet shall be into the same drainageway that the water would have reached before being diverted.

The contractor shall furnish the contracting officer, in writing, a proposed plan for diverting surface water before beginning any construction activities for which a diversion is required, unless waived in section 8 of this specification. Acceptance of this plan or the waiving of the plan requirement will not relieve the contractor of the responsibilities related to this activity during the process of completing the work as specified.

3. Dewatering the construction site Foundations, cutoff trenches, and all other parts of the construction site shall be dewatered and kept free of standing water and muddy conditions as necessary for the proper execution of the work. The contractor shall furnish, install, operate, and maintain all drains, sumps, pumps, casings, well points, and all other equipment required to properly dewater the site as specified. Dewatering systems that cause a loss of soil fines from the foundation areas will not be permitted.

The contractor shall furnish the contracting officer, in writing, a proposed plan for dewatering before commencing with any construction activity for which dewatering may be required, unless waived in section 8 of this specification. Acceptance of this plan or the waiving of the plan requirement will not relieve the contractor of the responsibilities for completing the specified work.

4. Dewatering borrow areas The contractor shall maintain all borrow areas free of surface water or otherwise provide for timely and effective removal of surface and subsurface water that accumulates within the borrow area, unless waived in section 8 of this specification. Borrow material shall be processed as necessary to achieve proper and uniform moisture content at the time of placement.

If pumping to dewater borrow areas is included as a bid item of work in the bid schedule, each pump discharge pipe shall be equipped with a water meter. The meter shall be such that the measured quantity of water is accurate within 3 percent of the true quantity. The contractor shall provide necessary support to perform accuracy tests of the water meter when requested by the contracting officer.

5. Erosion and pollution control Removal of water from the construction site, including the borrow areas, shall be accomplished so that erosion and the transporting of sediment and other pollutants are minimized. Dewatering activities shall be accomplished in a manner that the water table water quality is not altered. Pollution control activities

11–1

(210-VI-NEH, May 2001) shall not conflict with the requirements of Construction Specification 5, Pollution Control, if it is a part of this contract.

6. Removal of temporary works When temporary works are no longer needed, the contractor shall remove and return the area to a condi-tion similar to that which existed before construction. Areas where temporary works were located shall be graded for sightly appearance with no obstruction to natural surface waterflows or the proper func-tioning and access to the works of improvement installed. The contractor shall exercise extreme care during the removal stages to minimize the loss of soil sediment and debris that was trapped during con-struction.

Pipes, casings, and any other material used to dewater the site shall be removed from temporary wells.

The wells shall be filled to ground level with clean gravel or other suitable material approved by the contracting officer. The contractor shall exercise extreme care to prevent pollution of the ground water by these actions.

7. Measurement and payment Method 1—Items of work listed in the bid schedule for removal of water, diverting surface water, and dewatering construction sites and borrow areas are paid for at the contract lump sum prices. Such pay-ment will constitute full compensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.

Method 2—Items of work listed in the bid schedule for removal of water, diverting surface water, dewa-tering construction sites, and dewatering borrow areas are paid for at the contract lump sum prices.

Such payment will constitute full compensation for furnishing, installing, operating, and maintaining the necessary trenches, drains, sumps, pumps, and piping and for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work. The exception is that additional payment for pumping to dewater borrow areas and the removal of water will be made as described in the follow-ing paragraph.

If pumping to dewater borrow areas is a contract bid item, payment is made at the contract unit price, which shall be the price per 1,000 gallons shown in the bid schedule. Such payment will constitute full compensation for pumping only. Compensation for equipment and preparation and for other costs asso-ciated with pumping is included in the lump sum payment for removal of water or the lump sum pay-ment for dewatering the borrow areas. Payment is made only for pumping that is necessary to dewater borrow areas that cannot be effectively drained by gravity or that must have the water table lowered to be usable as a suitable borrow source. Pumping for other purposes will not be included for payment under this item.

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 contract line item to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in section 8 of this specification.

8. Items of work and construction details

11–2

NRCS-04/16 11-3

OK - O&R Ranch WRP

8. ITEMS OF WORK AND CONSTRUCTION DETAILS

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

a. Bid Item, Removal of Water

(1) This item consists of dewatering/diverting the surface water and ground water as necessary to perform the construction required by the contract in accordance with the specifications.

(2) A written plan for dewatering/diverting the surface water and ground water is required to be reviewed and approved by the Contracting Officer’s Representative prior to the beginning of work on this item.

(3) In Section 7, Measurement and Payment, Method 1 will apply.

NRCS-04/16 11-4

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 – 03/14 32-7

OK – O&R Ranch WRP

24. Items of work and construction details

Cement for all concrete work shall be Type I. Coarse aggregate shall be Size No. 57, Table 2, ASTM C-33, unless otherwise approved by the Engineer.

Items of work to be performed in conformance with this specification and the

a. Subsidiary Item, Concrete

(1) This item consists of furnishing and installing the concrete required for the footings and pads described in the drawings including but not limited to the pad for the trash guards for the Inline Water Control Structure and 18” Water Control Structure Gate.

(2) The concrete shall be Class 3000M.

(3) No separate payment will be made for Concrete. Compensation for this item will be included in the payment for Bid Item, 18” Water Control Structure Gate; Bid Items, HDPE with Inline Water Control Structures, as the case may be.

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Construction Specification 52—Steel Pipe

1. Scope The work shall consist of furnishing and installing steel pipe complete with lining, coating, fittings, and appurtenances.

2. Material Steel pipe and fittings shall conform to the requirements of Material Specification 554, Steel Pipe.

Unless otherwise specified, special fittings and appurtenances shall be of the same material as the pipe.

Welding electrodes shall conform to the requirements of Material Specification 581, Metal.

Coating and lining materials shall conform to the requirements of the following:

• AWWA C203, Standard for Coal-Tar Protective Coatings and Linings for Steel Water Pipelines - Enamel and Tape - Hot-Applied

• AWWA C209, Standard for Cold-Applied Tape Coatings for the Exterior of Special Sections, Con-nections, and Fittings for Steel Water Pipelines

• AWWA C214, Standard for Tape Coating Systems for the Exterior of Steel Water Pipelines and as specified below:

• Shop coating material shall conform to the requirements of AWWA Standard C203 and AWWA Standard C214 and as specified in section 12 of this specification.

• Shop lining material shall conform to the requirements of AWWA Standard C203.

• Field coating and coating repair material shall conform to the requirements of AWWA Standard C203, AWWA Standard C209, AWWA Standard C214, and, as specified in Section 12 of this specifi-cation.

• Field lining material shall conform to the requirements of AWWA Standard C203 and as specified in section 12 of this specification.

3. Coating and lining Shop coating of pipe, specials, and fittings shall be in accordance with AWWA Standard C203, AWWA Standard C209, or AWWA Standard C214 and as specified in Section 12 of this specification.

Shop lining of pipe, specials, and fittings shall conform to the requirements of AWWA Standard C203.

4. Excavation Excavation shall be in accordance with Construction Specification 21 or as specified in section 12 of this specification.

5. Laying and bedding the pipe Pipe shall be installed to the line and grade shown on the drawings. Unless otherwise specified, the pipe shall be installed so that there are no reversals of grade between joints, and shall be installed in accor-dance with the manufacturer's recommendations. The pipe shall be firmly and uniformly bedded to the depth and in the manner specified on the drawings. An ample bell hole working area may be left at pipe joints to perform welding, coating, and other related activities. The bell hole area shall then be bedded, as specified, before backfill operations.

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The pipe shall be weighed down sufficiently to prevent its displacement from the bedding during place-ment of the backfill under the haunches.

6. Joints and connections Pipe joints shall conform to the details shown on the drawings and shall be sound and watertight at the pressures specified in section 12 of this specification.

Welded joints—Welding and welded joints shall conform to the welding procedure details and require-ments of AWWA Standard C206. Field welding shall be done in such a way as to avoid burning the pro-tective coating on the pipe except in the immediate vicinity of the weld.

Where welded field joints are used, they shall be single welded butt joints or lap welded slip joints, as shown on the drawings. Special closure lap joints shall be used as described in AWWA Standard C206.

Bell and spigot joints—The dimensions of bells and spigots shall be in accordance with the manufacturer's standard design dimensions and tolerances.

The pipe shall be laid with the bell oriented upstream. The spigot end shall be seated in the bell to a depth as recommended by the manufacturer. The spigot, when seated, shall compress the gasket radially in its annular recess to provide a positive seal. Joints with fish-mouthed gaskets will be taken apart and reseated with a new gasket.

Rubber gaskets shall meet the requirements of AWWA Standard C200.

Mechanical couplings—The ends of pipe to be connected with mechanical couplings shall be ma-chined to allow coupling the pipe sections without damaging or displacing the gaskets and to ensure uniform end separation of the pipes. Machined ends of the pipe that receive the coupling sleeves shall be free from dents, gouges, rust, or scale. The pipe and couplings shall be assembled with continuous rub-ber ring gaskets conforming to the dimensions and tolerances recommended by the pipe manufacturer.

Coupling followers shall be drawn up evenly to ensure uniform pressure on the gaskets.

Grooved and shouldered joints shall be furnished and installed in accordance with AWWA Standard C606.

Flanged joints—All steel ring flanges shall be fabricated in accordance with AWWA Standard C207.

Gaskets shall be either a neoprene cloth insert 1/16 or 1/8 inch thick or red rubber 1/16 inch thick. The gasket shall be full face where used between flat face flange surfaces. All flanged joints shall be made up tightly and shall not leak.

Fitting and coupling coatings—Compression couplings, mechanical couplings, and flanged fittings shall be shop coated with the AWWA Standard C203 coal tar enamel coating, as recommended by the coating manufacturer, or a factory-applied vinyl coating at least 12 mils thick and as specified in section 12 of this specification. All bolts furnished for flanges, couplings, and other types of bolted connections shall be stainless steel or low alloy steel and shall be field coated with a coal tar enamel or vinyl coating after installation.

7. Field lining, coating, wrapping, and repair Lining and coating or wrapping of field joints or connections and repair of damage to the wrap or coat-ing on pipe, couplings, fittings, and appurtenances shall be made in accordance with section 12 of this specification and one of the following methods:

Method 1—All field coating, lining, and repair shall be as specified in AWWA Standard C203.

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Method 2—All field wrapping and repair shall be as specified in AWWA Standard C209 with type I or II tape.

Method 3—All field wrapping and repair shall be as specified in AWWA Standard C214 and as specified in section 12 of this specification.

Surface preparation—Bare steel surfaces shall be prepared for coating by removing all grease and oil or other soluble contaminants with solvent commercial cleaners (wiping, dipping, or steam) or vapor degreasing. After degreasing, surfaces shall be cleaned with hand tools to remove all loose scale rust and other loose detrimental foreign matter.

On previously coated surfaces, all dirt, paper, and other foreign matter and loose coating shall be re-moved. Kraft paper, whitewash, or other surface protective layers shall be removed at least 12 inches on either side of the bare steel to be coated.

Welds shall be cleaned of all welding slag, splatter, and scale. Sharp edges or burrs that could puncture or cut the coating shall be removed by grinding or filing. All welds shall be allowed to cool before apply-ing primer or coatings.

Primer application—After surface preparation is complete, primer shall be thoroughly mixed and applied in strict adherence to manufacturer's instructions. The primer shall be permitted to dry to the consistency recommended by the manufacturer before applying the coating. No foreign matter shall come in contact with the primed surface before application of the coating. Application of primer to surfaces shall be limited to that amount of area that can be wrapped during the same workshift. Primed areas not wrapped during the same workshift shall be reprimed. Cold weather applications of primer shall be done in accordance with AWWA Standard C203.

Coating application—The specified coating shall be applied in accordance with the manufacturer's recommendations unless otherwise specified.

After assembly, all pipe joints shall be field wrapped in accordance with AWWA C209 or AWWA C214, as appropriate. Surface preparation and primer application to the ends of the pipe to be wrapped shall be as previously described in this specification. A tape or filler tape shall be cigarette wrapped over the annular ring of the joint. The pipe coating shall be primed 2 inches back from the coating cutback and two layers of tape shall be wrapped overlapping 2 inches of pipe coating on one side of the joint, extend-ing across the joint and overlapping 2 inches of coating on the other side of the joint. Coal tar enamel coating cutback edges shall be tapered back until 1 inch of coal tar is exposed on the taper before prim-ing and wrapping. Wraps shall be terminated on the underside of the pipe. Tape widths shall be 6 inches for pipe greater than 8 inches in diameter and 4 inches for pipe 2 to 8 inches in diameter.

Welded field joints of lined pipe shall be lined in accordance with AWWA Standard C203, section 4.3, or as specified in section 12 of this specification.

Repair and patching factory coatings—All loose or disbonded material shall be removed from the area of the "holiday." All points, burrs, or rough edges shall be smoothed to a feathered edge. The surface shall be cleaned and prepared as specified for joints, couplings, and fittings. The area to be cleaned and prepared shall be at least twice the size of the "holiday." The repair coating shall be worked onto the surface of the steel to leave no voids or wrinkles on the surface.

Coal tar enamel coatings shall be repaired in accordance with AWWA Standard C203, section 2.15. Tape coatings shall be repaired in accordance with AWWA Standard C214, Section 3.4, Coating Repair. The repair shall be made by wrapping tape around the circumference of the pipe.

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All damaged vinyl coat areas shall be cleaned and recoated in accordance with the manufacturer's rec-ommendation.

8. Handling the pipe The contractor shall furnish such equipment as is necessary to place the pipe without damaging the pipe or coating. Coated pipe shall be handled in the manner specified in AWWA Standard C203 or C214, as appropriate.

9. Pressure testing If pressure testing of the conduit is specified, it shall be performed as follows:

a. Placement of backfill before pressure testing shall be as specified in section 10 of this specifica-tion.

b. Before pressure testing, the pipeline shall be flushed and cleaned.

c. The pipeline shall not be pressure tested until concrete in the anchor and thrust blocks has at-tained the minimum specified compressive strength.

d. The total conduit or section of the conduit, to be tested shall be filled with clean water at the rate specified and tested at the pressure specified in section 12 of this specification.

e. The section of conduit being tested shall be allowed to stand full of water for at least 24 hours before the start of pressure…