P03 12FPC322Q0011 Attachment 1 Construction Specifications.pdf

PEAVINE CREEK - N CR 3300 STREAMBANK STABILIZATION

GARVIN COUNTY

NOVEMBER 2021

Specifications Index

Construction Specifications

4 Channel Clearing and Shaping 6 Seeding, Sprigging, and Mulching 7 Construction Surveys 8 Mobilization and Demobilization 61 Rock Riprap

Material Specifications

Aggregates for Drainfill and Filters Rock Riprap

(210-VI-NEH, May 2001)

Construction Specification 4—Channel Clearing and Shaping

1. Scope The work consists of clearing designated areas by the removal and disposal of trees, logs, stumps, shrubs, brush, and rubbish, and the shaping of the channel.

2. Protection of existing vegetation Trees and other vegetation designated to remain undisturbed shall be protected from damage throughout the duration of the construction period. Any damages resulting from the contractor's operations or ne-glect shall be repaired by the contractor.

Earthfill, stockpiling of materials, vehicle or equipment parking, and excessive foot or vehicle traffic shall not be allowed within the drip line of vegetation designated to remain in place. Vegetation damaged by any of these or similar actions shall be replaced with viable vegetation of the same species, similar condition, and like size unless otherwise approved by the contracting officer.

Any cuts, skins, scrapes, or bruises to the bark of the vegetation shall be carefully trimmed and local nursery accepted procedures used to seal damaged bark.

Any limbs or branches 0.5 inch or larger in diameter that are broken, severed, or otherwise seriously damaged during construction shall be cut off at the base of the damaged limb or branch flush with the adjacent limb or tree trunk.

All roots 1 inch or larger in diameter that are cut, broken, or otherwise severed during channel shaping shall have the end smoothly cut perpendicular to the root. Roots exposed during channel shaping opera-tions shall be covered with moist soil as soon as possible to prevent roots from drying out.

3. Marking The limits of the area(s) to be cleared and shaped are marked by stakes, flags, paint, tree markings, or other suitable methods or as specified in section 8 of this specification, or they will be shown on the drawings. Trees to remain standing, undisturbed, and uninjured are designated by special markings.

4. Clearing Trees and other vegetation marked for clearing shall be cut off as near the ground surface as conven-tional tools and equipment normally permit. All trees not marked for preservation and all snags, logs, brush, shrubs, stumps, and rubbish shall be cleared from within the area limits identified.

5. Disposal All woody material, vegetation, and rubbish resulting from clearing from designated areas shall be dis-posed of at the locations and in a manner shown on the drawings, or as specified in section 8 of this specification.

6. Shaping The channel bottom and side slopes shall be shaped as shown on the drawings. The resulting shaped channel surface shall be reasonably smooth. Material excavated during the channel shaping operation shall be removed from the channel and disposed of as specified in section 8 of this specification.

4–1

7. Measurement and payment

Method 1—For items of work for which specific unit prices are established by the contract, the desig-nated cleared and shaped area is measured and the area determined to the nearest 0.1 acre. Payment for clearing and shaping is made at the contract unit price for the item and shall constitute full compensa-tion for all labor, equipment, tools, applicable permits and associated fees for burning and disposal of refuse, and all other items necessary and incidental to the satisfactory completion of the work.

Method 2—For items of work for which specific unit prices are established by the contract, the length of the cleared and shaped channel designated is measured to the nearest 100 feet. Payment for clearing and shaping is made at the contract unit price for the item and shall constitute full compensation for all labor, equipment, tools, applicable permits and associated fees for burning and disposal of refuse, and all other items necessary and incidental to the satisfactory performance of the work.

Method 3—For items of work for which specific unit prices are established by the contract, the cleared and shaped area(s) is measured and the area determined to the nearest 0.1 acre. The designated cleared and shaped area(s) is determined from the measured width at representative sections and the distance between the sections. Payment for clearing and shaping is made at the contract unit price for the item and shall constitute full compensation for all labor, equipment, tools, applicable permits and associated fees for burning and disposal of refuse, and all other items necessary and incidental to the satisfactory completion of the work.

Method 4—For items of work for which specific lump sum prices are established by the contract, the extent of clearing and shaping is not measured or determined for payment. Payment for clearing and shaping is made at the contract lump sum price for the item and shall constitute full compensation for all labor, equipment, tools, applicable permits and associated fees for burning and disposal of refuse, and all other items necessary and incidental to the satisfactory completion of the work.

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 items to which they have been made subsidiary are identified in section 8 of this specification.

4–2

NRCS – 11/2021 4 – 3

OK – Peavine Creek EWP

8. Items of Work and Construction Details

Disposal of timber and all other debris is the responsibility of the Garvin County Commissioners. The contractor shall remove and stockpile all debris as directed by the Contracting Officers Representative.

In Section 3, Marking, area will be marked with flagging by the Contracting Officer Representative.

In Section 5, Disposal, Disposal will be the responsibility of the Garvin County Commissioners.

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

a. Bid Item 4, Channel Shaping

(1) Dispose of and stabilize spoil material from clearing, grubbing, and channel excavation in a manner that will not interfere with the function of the channel.

Protect all disturbed areas around measures from erosion during construction.

(2) Shape the channel bottom and side slopes as shown on the drawings. The resulting shaped channel surface shall be reasonably smooth.

(3) The pay limits shall be the specified pay limits for excavation and the specified neat lines of the earthfill surface as staked in the field. The upper limit shall be the original ground surface as it existed before the start of construction operations.

(4) Payment for Channel Shaping within the specified limits is computed to the nearest cubic yard.

a. Subsidiary Item, Channel Clearing

(1) This item consists of the clearing and grubbing and stockpiling of trees, snags, logs, brush, shrubs, stumps and rubbish as needed within the work area to provide access and install planned measures.

(2) All trees within the excavation limits shall be cleared unless marked for retention by flagging. Vegetation beyond the limits required for excavation shall not be cleared.

(3) No separate payment will be made for Channel Clearing. Compensation for this item will be included in the payment for Bid Item 4, Channel Shaping.

NRCS – 09/2019 6 – 4

OK – LOOKEBA LAGOON GSS

Construction Specification 6—Seeding, Sprigging, and Mulching

1. Scope The work consists of preparing the area for treatment; furnishing and placing seed, sprigs, mulch, fertil-izer, inoculant, lime, and other soil amendments; and anchoring mulch in designated areas as specified.

2. Material Seed—All seed shall conform to the current rules and regulations of the state where it is being used and shall be from the latest crop available. It shall meet or exceed the standard for purity and germination listed in section 7.

Seed shall be labeled in accordance with the state laws and the U.S. Department of Agriculture rules and regulations under the Federal Seed Act in effect on the date of invitations for bids. Bag tag figures are evidence of purity and germination. No seed will be accepted with a test date of more than 9 months before the delivery date to the site.

Seed that has become wet, moldy, or otherwise damaged in transit or storage will not be accepted. The percent of noxious weed seed allowable shall be as defined in the current State laws relating to agricul-tural seeds. Each type of seed shall be delivered in separate sealed containers and fully tagged unless exception is granted in writing by the contracting officer.

Fertilizer—Unless otherwise specified, the fertilizer shall be a commercial grade fertilizer. It shall meet the standard for grade and quality specified by State law. Where fertilizer is furnished from bulk storage, the contractor shall furnish a supplier's certification of analysis and weight. When required by the con-tract, a representative sample of the fertilizer shall be furnished to the contracting officer for chemical analysis.

Inoculants—The inoculant for treating legume seeds shall be a pure culture of nitrogen-fixing bacteria prepared specifically for the species and shall not be used later than the date indicated on the container or as otherwise specified. A mixing medium, as recommended by the manufacturer, shall be used to bond the inoculant to the seed. Two times the amount of the inoculant recommended by the manufac-turer shall be used except four times the amount shall be used when seed is applied using a hydraulic seeder. Seed shall be sown within 24 hours of treatment and shall not remain in the hydraulic seeder longer than 4 hours.

Lime and other soil amendments—Lime shall consist of standard ground agriculture limestone, or ap-proved equivalent. Standard ground agriculture limestone is defined as ground limestone meeting cur-rent requirements of the State Department of Agriculture. Other soil amendments shall meet quality criteria and application requirements specified in section 7.

Mulch tackifiers—Asphalt emulsion tackifiers shall conform to the requirements of ASTM D 977, Specification for Emulsified Asphalt. The emulsified asphalt may be rapid setting, medium setting, or slow setting. Nonasphaltic tackifiers required because of environmental considerations shall be as speci-fied in section 7.

Straw mulch material—Straw mulch shall consist of wheat, barley, oat or rye straw, hay, grass cut from native grasses, or other plants as specified in section 7. The mulch material shall be air-dry, reason-ably light in color, and shall not be musty, moldy, caked, or otherwise of low quality. The use of mulch that contains noxious weeds is not permitted. The contractor shall provide a method satisfactory to the contracting officer for determining weight of mulch furnished.

6–1

Other mulch materials—Mulching materials, such as wood cellulose fiber mulch, mulch tackifiers, syn-thetic fiber mulch, netting, and mesh, are other mulching materials that may be required for specialized locations and conditions. These materials, when specified, must be accompanied by the manufacturer's recommendations for methods of application.

3. Seeding mixtures, sod, sprigs, and dates of planting The application rate per acre for seed mixtures, sprigs, or sod and date of seeding or planting shall be as shown on the plans or as specified in section 7.

4. Seedbed preparation and treatment Areas to be treated shall be dressed to a smooth, firm surface. On sites where equipment can operate on slopes safely, the seedbed shall be adequately loosened (4 to 6 inches deep) and smoothed. Depending on soil and moisture conditions, disking or cultipacking, or both, may be necessary to properly prepare a seedbed. Where equipment cannot operate safely, the seedbed shall be prepared by hand methods by scarifying to provide a roughened soil surface so that broadcast seed will remain in place.

If seeding is to be accomplished immediately following construction operations, seedbed preparation may not be required except on a compacted, polished, or freshly cut soil surface.

Rocks larger than 6 inches in diameter, trash, weeds, and other debris that will interfere with seeding or maintenance operations shall be removed or disposed of as specified in section 7.

Seedbed preparation shall be discontinued when soil moisture conditions are not suitable for the prepa-ration of a satisfactory seedbed as determined by the contracting officer's technical representative

(COTR).

5. Seeding, sprigging, fertilizing, mulching, and stabilizing All seeding or sprigging operations shall be performed in such a manner that the seed or sprigs are ap-plied in the specified quantities uniformly in the designated areas. The method and rate of seed applica-tion shall be as specified in section 7. Unless otherwise specified, seeding or sprigging shall be accom-plished within 2 days after final grading is completed and approved.

Fertilizer, lime, and other soil amendments shall be applied as specified in section 7. When specified, the fertilizer and soil amendments shall be thoroughly incorporated into the soil immediately following surface application.

The rate, amount, and kind of mulching or mesh shall be as specified in section 7. Mulches shall be ap-plied uniformly to the designated areas. They shall be applied to areas seeded not later than 2 working days after seeding has been performed. Straw mulch material shall be stabilized within 24 hours of appli-cation using a mulch crimper or equivalent anchoring tool or by a suitable tackifier. When the mulch crimper or equivalent anchoring tool is used, it shall have straight blades and be the type manufactured expressly for and capable of firmly punching the mulch into the soil. Where the equipment can be safely operated, it shall be operated on the contour. Hand methods shall be used where equipment cannot safely operate to perform the work required.

The tackifier shall be applied uniformly over the mulch material at the specified rate, or it shall be in-jected into the mulch material as it is being applied. Mesh or netting stabilizing materials shall be applied smoothly, but loosely on the designated areas. The edges of these materials shall be buried or securely anchored using spikes or staples as specified in section 7.

6–2

The contractor shall maintain the mesh or netting areas until all work under the contract has been com-pleted and accepted. Maintenance shall consist of the repair of areas damaged by water erosion, wind, fire, or other causes. Such areas shall be repaired to reestablish the intended condition and to the design lines and grades required by the contract. The areas shall be refertilized, reseeded, and remulched before the new application of the mesh or netting.

6. Measurement and payment Method 1—For items of work for which specific unit prices are established in the contract, each area treated is measured as specified in section 7 and the area calculated to the nearest 0.1 acre. Payment for treatment is made at the contract unit price for the designated treatment, which will constitute full com-pensation for completion of the work.

When specified as an item of work, mesh or netting is measured to the nearest square yard of surface area covered and accepted. Payment is made at the contract unit price and will constitute full compensa-tion for completion of the work.

Method 2—For items of work for which specific lump sum prices are established in the contract, the quantity of work will not be measured for payment. Payment for this item is made at the contract lump sum price for the item and will constitute full compensation for the completion of the work.

Method 3—For items of work for which lump sum prices are established in the contract, payment is made as the work proceeds. Progress payments will be determined as specified in section 7. Payment of the lump sum contract price will constitute full compensation for completion of the work.

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 item(s) to which they are made subsidiary are identified in section 7.

7. Items of work and construction details

6–3

6-4 (210-VI-NEH, May 2001)

(This page intentionally left blank.)

NRCS – 11/2021 6 – 5

OK – Peavine Creek – N CR 3300 EWP

7. 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 5, Mulch Sodding, Bermudagrass

(1) This item consists of site preparation, furnishing, fertilizing, and planting bermudagrass (Cynodon) Mulch Sod on all disturbed areas including ingress/egress roads, areas where concentrated flow is expected, and finished cut slopes, earthfill slopes and waste areas as directed by the Contracting Officer’s Representative (COR).

(2) Mulch Sod shall consist of a mixture of fertile, loamy textured topsoil (<70% sand) and root divisions (rhizomes) of locally adapted bermudagrass varieties.

(a) The bermudagrass roots need to be deep, thick, and vigorous. At least 70% of the plants in the sod need to be bermudagrass with no invasive species.

(b) The proportion of soil in the mix shall be adequate to protect the grass roots from drying after planting.

(3) Mulch sod is available on site in the immediate area of work. Topsoil salvaged according to construction specification 26 should provide adequate mulch sod to cover the disturbed areas.

(4) The contractor shall notify the COR of alternate sources of mulch sod if needed, and secure approval of the sources prior to harvest and delivery to the job site. The contractor shall provide the COR free access to the source for the purpose of inspection.

(a) Make sure the soil is moist, not overly wet or dry before harvesting.

(b) Prior to harvest, top growth greater than two inches shall be removed.

(c) Disk in two directions to cut the sod and mix well with moist topsoil 4 to 8 inches deep

(d) Keep the mulch sod moist until spread on the site. Apply mulch sod on site within 30 hours of harvest.

(5) Planting dates shall be anytime the soil is not frozen and when adequate moisture (to a depth of 4 inches) is present for establishment.

(6) Site Preparation - Prior to Mulch sodding, the area shall be prepared by any method which will result in a clean, friable, firm seedbed.

NRCS – 09/2019 6 – 6

OK – LOOKEBA LAGOON GSS

(a) Tillage will be at a minimum depth of 4 inches

(b) Rills and gullies will be filled or tilled if needed to ensure site is level and smooth prior to spreading the sod mulch.

(7) Fertilizers shall be a 1-1-1 ratio in a slow release pelleted form and uniformly mixed. Labeling or analysis records shall be in accordance with the Oklahoma Fertilizer Law. Where fertilizer is furnished from bulk storage, the contractor shall furnish a supplier's certification of analysis and weight.

(a) Fertilizer shall be uniformly applied at a rate of 40 pounds nitrogen, 40 pounds phosphate (P2O5), and 40 pounds potash (K2O) per acre.

(b) The fertilizer shall be incorporated into the soil prior to planting or by the planting equipment provided it is not applied in such a manner as to be in direct contact with the sprigs.

(8) Sod Mulch will be spread in the following manner:

(a) Within 24 hours of site preparation. The soil at the time of planting shall be moist and not frozen. If planting cannot be accomplished when adequate moisture is available (moisture cannot be detected to a depth of 4”), areas to be planted shall be moistened to a depth of 2 inches prior to sprigging and immediately following.

(b) The sod mulch mixture shall be uniformly spread over the area to be treated at a minimum depth of 3 inches.

(c) After planting, the area shall be lightly packed with a flexible rolling-type soil packer or cultipacker to firm the soil around the roots and left in a smooth condition.

(9) No separate payment will be made for Construction Surveys. Compensation for this item will be included in the payment for Bid Item 2, Riprap Installed.

7–1(210–VI–NEH, January 2009)

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 equip-ment shall be maintained in good working order and in proper adjustment at all times. Records of repairs, calibra-tion 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 recommenda-tions.

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 an-gular 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 loca-tion of structures shall be made to the nearest 0.1 foot.

Construction Specification 7—Construction Surveys

7–2 (210–VI–NEH, January 2009)

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 construc-tion, are shown on the drawings and have been located on the job site.

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 engi-neer'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.

7–3(210–VI–NEH, January 2009)

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.

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 ref-erenced 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 re-cords 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 en-gineer 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 evi-dence 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 docu-mentation 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 hav-ing 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.

9. Items of work and construction details

(210–VI–NEH, January 2009)

NRCS – 11/2021 7-5

9. Items of work and construction details

The construction staking as described in section 6 (Clearing and Grubbing and excavation and fill) of this specification will be provided by the Contracting Officer.

a. Subsidiary Item, Construction Surveys

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

(2) In Section 5, Construction Surveys, Method 1 will apply. After initial staking is completed by NRCS, the contractor assumes all responsibility for maintaining all stakes, hubs, reference points, etc., and shall replace them if they are destroyed.

(3) Slopes of channel side slopes and grade shall be checked for conformance to designated line and grade at vertical intervals not to exceed five feet or horizontal intervals of 50 feet.

(4) The contractor shall always have on site the appropriate equipment and trained personnel to perform this work.

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

Compensation for this item will be included in the payment for Bid Item 1, Mobilization.

NRCS – 11/2021 7-5

Construction Specification 8—Mobilization and Demobilization

1. Scope The work consists of the mobilization and demobilization of the contractor's forces and equipment nec-essary for performing the work required under the contract. It does not include mobilization and demo-bilization for specific items of work for which payment is provided elsewhere in the contract. Mobiliza-tion will not be considered as work in fulfilling the contract requirements for commencement of work.

2. Equipment and material Mobilization shall include all activities and associated costs for transportation of contractor's personnel, equipment, and operating supplies to the site; establishment of offices, buildings, and other necessary general facilities for the contractor's operations at the site; premiums paid for performance and payment bonds including coinsurance and reinsurance agreements as applicable; and other items specified in section 4 of this specification.

Demobilization shall include all activities and costs for transportation of personnel, equipment, and supplies not required or included in the contract from the site; including the disassembly, removal, and site cleanup of offices, buildings, and other facilities assembled on the site specifically for this contract.

This work includes mobilization and demobilization required by the contract at the time of award. If additional mobilization and demobilization activities and costs are required during the performance of the contract as a result of changed, deleted, or added items of work for which the contractor is entitled to an adjustment in contract price, compensation for such costs will be included in the price adjustment for the item or items of work changed or added.

3. Payment Payment will be made as the work proceeds, after presentation of paid invoices 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 price, 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 compen-sation for completion of the work.

Payment will not be made under this item for the purchase costs of materials having a residual value, the purchase costs of materials to be incorporated in the project, or the purchase costs of operating sup-plies.

4. Items of work and construction details

8–1

NRCS – 11/2021 8-

4. Items of work and construction details

a. Bid Item, Mobilization and Demobilization

(1) 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) The entire job site shall be considered a hardhat area. All persons including operators inside an enclosed cab are required to wear a hardhat properly labeled with a minimum certification of ANSI Z89.1 1997 Class G or E Type I or II and less than five years old. Signs at least 3 feet by 4 feet in size with red letters at least 6 inches high and a white background shall be erected at all access points. The signs shall read

“CONSTRUCTION AREA - HARDHATS REQUIRED BEYOND

THIS POINT”. Variances to the exact signage requirements listed above may be approved by the Government.

(3) The contractor shall comply with Occupational Safety and

Health Administration (OSHA), Part 1926, Construction Standards and Interpretations in effect on the date of issuance of the invitation for bids. (Copies may be obtained from Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402.)

In addition to the above OSHA requirements, the contractor shall comply with provisions in the NRCS Supplement to OSHA Parts 1910 and 1926 (See Attachment B to this Item of Work).

(4) The contractor shall provide a job coordinator to be always available on each site while work is in progress. The job coordinator shall coordinate the delivery and stockpile of materials, direct the contractor’s work operations, and coordinate activities with the Government and project sponsors. The job coordinator shall have a cellular telephone or other suitable method of communication at the job site to coordinate activities with the quarry, truckers, personnel, and emergency services, if needed. (If the contractor chooses to work on multiple sites concurrently, a job coordinator is required for each site.) The job coordinator will NOT operate equipment.

(1) This item shall include providing an individual on the work crew who has a current first aid certificate from the Mine Safety and Health Administration, American Red Cross, or other state-approved organization.

(2) This item shall include providing one moisture-proof, dust-tight, 16-unit American Red Cross approved first aid kit for every 25 employees. These first aid kits must be located in accessible, well-identified locations at the job site and be replenished as contents are used or become ineffective or outdated.

(3) This item shall include providing a chemical toilet (port-a-potty) on each job site.

(4) To minimize the establishment of the Imported Fire Ant, Solenopsis invicta, Federal Regulation 7 CFR 301.81 and Oklahoma Administrative Rule OAC 35:30-13-3 have established a quarantine to regulate the movement of soil, hay or straw, plants with soil attached (including grass sod), and soil-moving equipment. All soil-moving equipment shall be properly washed and/or otherwise cleaned of all soil material before mobilizing to and demobilizing from the job site(s).

Equipment cleaning is not required for site-to-site mobilization within a County on contracts which contain more than one job site. The movement of other regulated articles listed above may require an authenticated certificate or permit.

(5) 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 Government officer immediately.

(6) 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.

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

(a.) Construction Surveys – Construction Specification 7

61–1(210–VI–NEH, January 2014)

The work shall consist of the construction of rock riprap revetments and blankets, including filter or bedding where specified.

2. Material Rock riprap shall conform to the requirements of Material Specification 523, Rock for Riprap, or if so specified, shall be obtained from designated sources. It shall be free from dirt, clay, sand, rock fines, and other material not meeting the required gradation limits.

At least 30 days before rock is delivered from other than designated sources, the contractor shall designate in writ-ing the source from which rock material will be obtained and provide information satisfactory to the contracting officer that the material meets contract requirements. The contractor shall provide the contracting officer's techni-cal representative (COTR) free access to the source for the purpose of obtaining samples for testing. The size and grading of the rock shall be as specified in section 8.

Rock from approved sources shall be excavated, selected, and processed to meet the specified quality and grading requirements at the time the rock is installed.

Based on a specific gravity of 2.65 (typical of limestone and dolomite) and assuming the individual rock is shaped midway between a sphere and a cube, typical size/weight relationships are:

Sieve size of rock

Approx. weight of rock

Weight of test pile

16 inches 300 pounds 6,000 pounds

11 inches 100 pounds 2,000 pounds

6 inches 15 pounds 300 pounds

When specified in Section 8 or when it is necessary to verify the gradation of the rock riprap, a particle size analysis shall be performed in accordance with ASTM D5519, Test Method A or B. The analysis shall be performed at the work site on a test pile of representative rock. The mass of the test pile shall be at least 20 times the mass of the largest rock in the pile The results of the test shall be compared to the gradation required for the project. Test pile results that do not meet the construction specifications shall be cause for the rock to be rejected. The test pile that meets contract requirements shall be left on the job site as a sample for visual comparison. The test pile shall be used as part of the last rock riprap to be placed.

Filter or bedding aggregates when required shall conform to Material Specification 521, Aggregates for Drainfill and Filters, unless otherwise specified. Geotextiles shall conform to Material Specification 592, Geotextile.

3. Subgrade preparation The subgrade surface on which the rock riprap, filter, bedding, or geotextile is to be placed shall be cut or filled and graded to the lines and grades shown on the drawings. When fill to subgrade lines is required, it shall consist of ap-proved material and shall conform to the requirements of the specified class of earthfill.

Rock riprap, filter, bedding, or geotextile shall not be placed until the foundation preparation is completed and the subgrade surface has been inspected and approved.

4. Equipment-placed rock riprap The rock riprap shall be placed by equipment on the surface and to the depth specified. It shall be installed to the full course thickness in one operation and in such a manner as to avoid serious displacement of the underlying material. The rock for riprap shall be delivered and placed in a manner that ensures the riprap in place is reason-

Construction Specification 61—Rock Riprap

61–2 (210–VI–NEH, January 2014) ably homogeneous with the larger rocks uniformly distributed and firmly in contact one to another with the smaller rocks and spalls filling the voids between the larger rocks. Some hand placing may be required to provide a neat and uniform surface.

Rock riprap shall be placed in a manner to prevent damage to structures. Hand placing is required as necessary to prevent damage to any new and existing structures.

5. Hand placed rock riprap The rock riprap shall be placed by hand on the surface and to the depth specified. It shall be securely bedded with the larger rocks firmly in contact one to another without bridging. Spaces between the larger rocks shall be filled with smaller rocks and spalls. Smaller rocks shall not be grouped as a substitute for larger rock. Flat slab rock shall be laid on its vertical edge except where it is laid like paving stone and the thickness of the rock equals the speci-fied depth of the riprap course.

6. Filter or bedding When the contract specifies filter, bedding, or geotextile beneath the rock riprap, the designated material shall be placed on the prepared subgrade surface as specified. Compaction of filter or bedding aggregate is not required, but the surface of such material shall be finished reasonably smooth and free of mounds, dips, or windrows.

7. Measurement and payment Method 1—For items of work for which specific unit prices are established in the contract, the quantity of each type of rock riprap placed within the specified limits is computed to the nearest ton by actual weight. The volume of each type of filter or bedding aggregate is measured within the specified limits and computed to the nearest cubic yard by the method of average cross-sectional end areas. For each load of rock riprap placed as specified, the contractor shall furnish to the COTR a statement-of-delivery ticket showing the weight to the nearest 0.1 ton.

Payment is made at the contract unit price for each type of rock riprap, filter, or bedding. Such payment is consid-ered full compensation for completion of the work.

Method 2—For items of work for which specific unit prices are established in the contract, the quantity of each type of rock riprap placed within the specified limits is computed to the nearest 0.1 ton by actual weight. The quantity of each type of filter or bedding aggregate delivered and placed within the specified limits is computed to the nearest 0.1 ton. For each load of rock riprap placed as specified, the contractor shall furnish to the engineer a statement-of-delivery ticket showing the weight to the nearest 0.1 ton. For each load of filter or bedding aggregate, the contractor shall furnish to the COTR a statement-of-delivery ticket showing the weight to the nearest 0.1 ton.

Payment is made at the contract unit price for each type of rock riprap, filter, or bedding. Such payment is consid-ered full compensation for completion of the work.

Method 3—For items of work for which specific unit prices are established by the contract, the volume of each type of rock riprap and filter or bedding aggregate is measured within the specified limits and computed to the nearest cubic yard by the method of average cross-sectional end areas.

Payment is made at the contract unit price for each type of rock riprap, filter, or bedding. Such payment is consid-ered full compensation for completion of the work.

Method 4—For items of work for which specific unit prices are established by the contract, the volume of each type of rock riprap, including filter and bedding aggregate, is measured within the specified limits and computed to the nearest cubic yard by the method of average cross-sectional end areas.

61–3(210–VI–NEH, January 2014)

Payment is made at the contract unit price for each type of rock riprap, including filter and bedding. Such payment is considered full compensation for completion of the work.

Method 5—For items of work for which specific unit prices are established by the contract, the quantity of each type of rock riprap placed within the specified limits is computed to the nearest ton by actual weight. For each load of rock for riprap placed as specified, the contractor shall furnish to the COTR a statement-of-delivery ticket show-ing the weight to the nearest 0.1 ton.

Payment is made at the contract unit price for each type of rock riprap, and includes compensation for any ag-gregate or geotextile installed as specified for filter or bedding. Such payment is considered full compensation for completion of the work.

Method 6—For items of work for which specific unit prices are established by the contract, the volume of each type of rock riprap is measured within the specified limits and computed to the nearest cubic yard by the method of average cross-sectional end areas.

Payment is made at the contract unit price for each type of rock riprap, and includes compensation for any ag-gregate or geotextile installed as specified for filter or bedding. Such payment is considered full compensation for completion of the work.

All methods—The following provision applies 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 and the items to which they are made subsidiary are identi-fied in section 8.

No separate payment is made for testing the gradation of the test pile. Compensation for testing is included in the appropriate bid item for riprap.

8. Items of work and construction details

61–4 (210–VI–NEH, January 2014)

NRCS – 11/2021 61-5

8. Items of work and construction details

Riprap shall meet the requirements of Rock Type 3 of Material Specification 523, Section 2.

Riprap Bedding shall meet the requirements of Material Specification 521, Section 2.

All rock must be delivered to the site with end dump trailers unless other delivery methods are approved by the Government.

All rock may be equipment placed.

Loads that arrive on the job that appear to have a significant deviation from the specification, as determined by a cursory inspection by the Government, will be rejected and the supplier will remove the questionable material. If the material is unloaded on the site and the Government determines there is a significant deviation from the specification, the weight ticket will be noted as objectionable and can be handled one of two ways as determined by the supplier's Job Coordinator:

a. The supplier can reload the material and remove it from the job. No compensation will be made for the material.

b. The Government can note on the ticket that the material does not meet specifications, the reason it does not meet specifications in his opinion, and the weight of the questionable load will be reduced by 50%. The material will then be utilized in some form or fashion on the job.

The Sponsor will provide one front-end loader (w/operator) to assist with rock placement and assist with site smoothing, leveling, and stock-pile control. The Job Coordinator will be required to coordinate contractor activities with the Sponsor to allow for efficient management of the project. No additional equitable adjustment in contract price or performance time will be allowed due to failure of contractor to effectively coordinate such activity. Use of the sponsor's equipment by the contractor is not allowed.

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

a. Bid Item 2, Riprap, Installed

(1) This item consists of furnishing and placing rock riprap on the slopes to a 36” thickness and in footings to the extent shown on the drawings and as described in this specification. The table below is the required gradation.

Rock Riprap Gradation

DMAX = 36”

% Diameter, in. Size Range

MAX. 27 -36 1458 - 3457

85 24 – 33 949 - 2520

50 18 - 27 432 - 1458

10 14 - 24 221 - 949

<5 <14 Gravel/Sand/Dust

NRCS – 11/2021 61-6

(2) Quantities in the bid schedule are estimated quantities. The Job Coordinator shall coordinate activities with the Contracting Officers Representative to ensure that the proper quantity of riprap needed to complete the work is delivered to the site.

(3) The Job Coordinator will be responsible for taking weight delivery tickets and making copies available to the Government Inspector.