Attachement 1 Specs.pdf

NS 411 RD EWP

NOWATA COUNTY

December 2025

Specifications Index

Construction Specifications

004 Channel Clearing and Shaping 007 Construction Surveys 008 Mobilization and Demobilization 061 Rock Riprap 094 Contractor Quality Contractor

Material Specifications

523 Rock for Riprap 521 Aggregates for Drainfill and Filters

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210 H 642 CS 4 (June 2024) 1

Construction Specification 4 — Channel Clearing and Shaping

Title 210 - Engineering Part 642 – Specifications for Construction Contracts Subpart B – National Construction Specifications June 2024

A. Scope

1. 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.

B. Protection of Existing Vegetation

1. Protect trees and other vegetation designated to remain undisturbed from damage throughout the duration of the construction period. Any damages resulting from the contractor’s operations or neglect must be repaired by the contractor.

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

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

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

5. All roots 1 inch or larger in diameter that are cut, broken, or otherwise severed during channel shaping must have the ends smoothly cut perpendicular to the root. Roots exposed during channel shaping operations must be covered with moist soil as soon as possible to prevent them from drying out.

C. Marking

1. The limits of the areas to be cleared and shaped are marked by stakes, flags, paint, tree markings, or other suitable methods or as specified in Section H of this specification or will be shown on the drawings. Trees to remain standing, undisturbed, and uninjured are designated by special markings.

D. Clearing

1. Trees and other vegetation marked for clearing must be cut off as near the ground surface as conventional tools and equipment normally permit. All trees not

210 H 642 CS 4 (June 2024) 2 marked for preservation and all snags, logs, brush, shrubs, stumps, and rubbish must be cleared from within the area limits identified.

E. Disposal

1. Dispose of all woody material, vegetation, and rubbish resulting from clearing from designated areas at the locations and in a manner shown on the drawings or as specified in Section H of this specification.

F. Shaping

1. Shape the channel bottom and side slopes as shown on the drawings. The resulting shaped channel surface must be reasonably smooth. Remove and dispose material excavated during the channel-shaping operation from the channel as specified in Section H of this specification.

G. Measurement and Payment

1. Method 1. For items of work for which specific unit prices are established by the contract, the designated cleared and shaped area is measured and area is determined to the nearest 0.1 acre. Payment for clearing and shaping is made at the contract unit price for the item and constitutes 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.

2. 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 constitutes 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.

3. Method 3. For items of work for which specific unit prices are established by the contract, the cleared and shaped areas is measured, and area is determined to the nearest 0.1 acre. The designated cleared and shaped areas 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 constitutes 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.

4. 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 constitutes 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.

5. All Methods. The following provisions apply to all methods of measurement and payment. Compensation for any item of work described in the contract but not listed in the bid schedule is included in the payment for the item of work to which

210 H 642 CS 4 (June 2024) 3 it is made subsidiary. Such items and items to which they have been made subsidiary are identified in Section H of this specification.

H. Items of Work and Construction Details

NRCS – 12/2025

OK – NS 411 RD EWP 4-4

8. Items of Work and Construction Details

Disposal of timber and all other debris is the responsibility of the Nowata 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 by the Contracting Officer Representative (COR) or by the Government Inspector as directed by the COR.

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

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

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 1, Mobilization.

210 H 642 CS 7 (June 2024) 1

Construction Specification 7 — Construction Surveys

Title 210 – Engineering Part 642 –Specifications for Construction Contracts Subpart B – National Construction Specifications June 2024

A. Scope

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

B. Equipment and Material

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

2. Necessary materials include field notebooks, stakes, templates, platforms, equipment, spikes, steel pins, tools, and all other items necessary to perform the work specified.

C. Quality of Work

1. All work must follow recognized professional practice and the standards of the industry unless otherwise specified in Section I of this specification. Perform the work to the accuracy and detail appropriate for the type of job. Notes, sketches, and other data must be complete, neatly recorded, legible, reproducible, and organized to facilitate ease in review for job documentation. Survey equipment that requires little or no manual recording of field data must have survey information documented as outlined in Section I of this specification.

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

3. If a computer program is used to perform the computations, the contractor must provide the engineer with the software identification, vendor’s name, version number, and other pertinent data before beginning survey activities. Computer-generated computations must show all input data, including values assigned and assumptions made.

210 H 642 CS 7 (June 2024) 2

4. Determine and record the elevations of permanent and temporary benchmarks to the nearest 0.01 foot. Differential leveling and transit traverses must be of such precision that the error of vertical closure in feet must not exceed plus or minus

0.1 times the square root of the traverse distance in miles. Linear measurements must be accurate to within 1 foot in 5,000 feet unless otherwise specified in Section I of this specification. The angular error of closure for transit traverses must not exceed 1 minute times the square root of the number of angles turned.

5. The minimum requirements for placing slope stakes must be at 100-foot stations for tangents and 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 must be perpendicular to the centerline. Significant breaks in grade must be determined for cross-sections. Distances must be measured horizontally and recorded to the nearest 0.1 foot. Side shots for interim construction stakes may be taken with a hand level.

6. Unless otherwise specified in Section I of this specification, measurements for stationing and establishing the location of structures must be made to the nearest

0.1 foot.

7. Elevations for concrete work, pipes, and mechanical equipment must be determined and recorded to the nearest 0.01 foot. Elevations for earthwork must be determined and recorded to the nearest 0.1 foot.

D. Primary Control

1. The baselines and benchmarks for primary control necessary to establish lines and grades needed for construction are shown on the drawings and have been located on the jobsite.

2. These baselines and benchmarks must be used as the origin of all surveys, layouts, and measurements to establish construction lines and grades. The contractor must 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.

E. Construction Surveys

1. All Methods. Before starting work that requires contractor-performed surveys, the contractor must submit in writing for the engineer’s review the names, qualifications, and experiences of the individuals to be assigned to the survey tasks.

2. Method 1. Contractor-performed surveys must include:

a. Checking and any supplemental or interim staking

b. Performing quantity surveys, measurements, and computations for progress payment

c. Other surveys as described in Section I of this specification

210 H 642 CS 7 (June 2024) 3

3. Method 2. Contractor-performed surveys must consist of all work necessary for:

a. Establishing line and grade for all work

b. Setting slope stakes for all work

c. Checking and any supplemental or interim staking

d. Establishing final grade stakes

e. Performing quantity surveys, measurements, and computations for progress payment

f. Other surveys as described in Section I of this specification

4. Method 3. Contractor-performed surveys must consist of all work necessary for:

a. Establishing line and grade for all work

b. Setting slope stakes for all work

c. Checking and any supplemental or interim staking

d. Establishing final grade stakes

e. Performing quantity surveys, measurements, and computations for progress payments

f. Performing initial and final surveys for determinations of final quantities

g. Other surveys as described in Section I of this specification.

F. Staking

1. Complete the construction staking required for the item before work on any item starts. Complete construction staking as follows or as otherwise specified in Section I of this specification:

a. Clearing and Grubbing. The boundary of the areas to be cleared and grubbed must 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.

b. Excavation and Fill. Place slope stakes at the intersection of the specified slopes and ground line. Slope stakes and the reference stakes for slopes must 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 are outlined in Section C, Quality of Work.

c. Structures. Place centerline and offset reference line stakes for location, alignment, and elevation for all structures.

G. Records

1. Record all survey data in properly labeled, standard, hardbound engineering survey field notebooks with consecutively numbered pages. All field notes and printed data must 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 must be bound with numbered pages and cross-referenced in a bound field notebook containing the index for all survey activities. All work must follow recognized professional practices.

210 H 642 CS 7 (June 2024) 4

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

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

H. Payment

1. 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.

2. 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.

3. 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 I of this specification.

I. Items of Work and Construction Details

OK – NS 411 RD EWP 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.

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 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.

210 H 642 CS 8 (June 2024) 1

Construction Specification 8 — Mobilization and Demobilization

Title 210 – Engineering Part 642 – Specifications for Construction Contracts Subpart B – National Construction Specifications June 2024

A. Scope

1. The work consists of the mobilization and demobilization of the contractor’s forces and equipment necessary for performing the work required under the contract. It does not include mobilization and demobilization for specific items of work for which payment is provided elsewhere in the contract. Mobilization will not be considered as work in fulfilling the contract requirements for commencement of work.

B. Equipment and Material

1. Mobilization includes 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 D of this specification.

2. Demobilization includes 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.

3. 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.

C. Payment

1. 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 compensation for completion of the work.

210 H 642 CS 8 (June 2024) 2

2. 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 supplies.

D. Items of Work and Construction Details

OK – NS 411 RD EWP 8-3

4. 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 1, Mobilization

(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 contractor shall be responsible for identifying the location of utilities prior to construction activities and shall notify the OKIE811 System. Notice shall be given no less than forty-eight

(48) hours, excluding the date of notification, Saturdays, Sundays and legal holidays, prior to the commencement of the work. Notice shall expire fourteen (14) calendar days from the excavation start date. No excavation may continue after the fourteenth day unless subsequent notice has been submitted pursuant to notice requirements. If any unidentified utilities are encountered after work is initiated, the contractor shall discontinue work and notify the contracting officer immediately.

(3) 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.

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

(5) The entire job site shall be considered a hardhat area. All people, 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.

OK – NS 411 RD EWP 8-4

(6) 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 included in the Special Provision.

(7) This item shall also 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.

(8) This item shall also 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.

(9) This item also consists of stabilizing, maintaining, and restoring the ingress-egress road. The ingress-egress road shall be restored back to a condition “as-good-as” or better than it was prior to the start of construction.

(10) 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.

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

(a) Channel Clearing and Shaping - Construction Specification

(b) Construction Surveys - Construction Specification 7

(c) Contractor Quality Control – Construction Specification 94

210 H 642 CS 61 (June 2024) 1

Construction Specification 61 — Rock Riprap Title 210 – Engineering Part 642 – Specifications for Construction Contracts Subpart B – National Construction Specifications June 2024

A. Scope

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

B. Material

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

2. At least 30 days before rock is delivered from other than designated sources, the contractor must designate in writing 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 must provide the responsible engineer free access to the source for the purpose of obtaining samples for testing.

The size and grading of the rock must be as specified in section H.

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

4. 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 given in figure 61-1:

Figure 61-1 Typical riprap size/weight relationship 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

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

210 H 642 CS 61 (June 2024) 2

6. Filter or bedding aggregates, when required, must conform to Material Specification 521, Aggregates for Drainfill and Filters, unless otherwise specified.

Geotextiles must conform to Material Specification 592, Geotextile.

C. Subgrade preparation

1. The subgrade surface on which the rock riprap, filter, bedding, or geotextile is to be placed must be cut or filled and graded to the lines and grades shown on the drawings. When fill to subgrade lines is required, it must consist of approved material and conform to the requirements of the specified class of earthfill.

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

D. Equipment-placed rock riprap

1. The rock riprap must be placed by equipment on the surface and to the depth specified. It must 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 must be delivered and placed in a manner that ensures the riprap in place is reasonably 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.

2. Rock riprap must 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.

E. Hand-placed rock riprap

1. The rock riprap must be placed by hand on the surface and to the depth specified.

It must be securely bedded with the larger rocks firmly in contact one to another without bridging. Spaces between the larger rocks must be filled with smaller rocks and spalls. Smaller rocks must not be grouped as a substitute for larger rock.

Flat slab rock must be laid on its vertical edge except where it is laid like paving stone and the thickness of the rock equals the specified depth of the riprap course.

F. Filter or bedding

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

G. Measurement and payment

1. Method 1.

a. 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

210 H 642 CS 61 (June 2024) 3 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 must furnish to the responsible engineer a statement-of-delivery ticket showing the weight to the nearest 0.1 ton.

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

2. Method 2.

a. 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 must 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 must furnish to the responsible engineer a statement-of-delivery ticket showing the weight to the nearest 0.1 ton.

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

3. Method 3.

a. 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.

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

4. Method 4.

a. 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.

b. 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.

5. Method 5.

a. 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 must furnish to the responsible

210 H 642 CS 61 (June 2024) 4 engineer a statement-of-delivery ticket showing the weight to the nearest 0.1 ton.

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

6. Method 6.

a. 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.

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

7. All methods.

a. 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 identified in section H.

b. 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.

H. Items of work and construction details

OK – NS 411 RD EWP 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 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

OK – NS 411 RD EWP 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. The Job Coordinator will also keep daily totals and running totals of all rock riprap delivered to the site.

(4) In Section 7, Measurement and Payment, Method 2 will apply.

b. Bid Item 3, Riprap Bedding, Installed

(1) This item consists of furnishing and placing riprap bedding to a 12” thickness on the slopes to the extent shown on the drawings and as described in this specification. The table below is the required gradation.

Riprap Bedding Gradation

DMAX = 6”

% SIEVE SIZE

100 6”

75 - 100 4”

60 - 92 3”

41 - 76 2”

17 - 49 1”

0 - 30 ½”

<5 #4

(2) Bedding will be placed on the slope as shown as work proceeds and covered with rock riprap at the conclusion of each workday.

(3) 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 bedding needed to complete the work is delivered to the site.

(4) The Job Coordinator will be responsible for taking weight delivery tickets and making copies available to the Government Inspector. The Job Coordinator will also keep daily totals and running totals of riprap bedding delivered to the site.

(5) In Section 7, Measurement and Payment, Method 2 will apply.

Title 210 – National Engineering Handbook

(210-642-H, 2nd Ed., Amend. 1, Apr 2022) 523-1

Part 642 – Specifications

Chapter 3 – National Standard Material Specifications

Material Specification 523—Rock for Riprap A. Scope

This specification covers the quality of rock to be used in the construction of rock riprap.

B. Quality

(1) Individual rock fragments must be dense, sound, and free from cracks, seams, and other defects conducive to accelerated weathering. Except as otherwise specified, the rock fragments must be angular to subrounded. The least dimension of an individual rock fragment must be not less than one-third the greatest dimension of the fragment. ASTM D4992 provides guidance on selecting rock from a source.

(2) Except as otherwise provided, the rock must be tested and must have the following properties:

(i) Rock type 1

• Bulk specific gravity (saturated surface-dry basis)—Not less than 2.5 when tested in accordance with ASTM D6473 on samples prepared as described for soundness testing.

• Absorption—Not more than 2 percent when tested in accordance with ASTM D6473 on samples prepared as described for soundness testing.

• Soundness—The weight loss in 5 cycles must not be more than 10 percent when sodium sulfate is used or more than 15 percent when magnesium sulfate is used.

(ii) Rock type 2

• Bulk specific gravity (saturated surface-dry basis)—Not less than 2.5 when tested in accordance with ASTM D6473 on samples prepared as described for soundness testing.

• Absorption—Not more than 2 percent when tested in accordance with ASTM D6473 on samples prepared as described for soundness testing.

• Soundness—The weight loss in 5 cycles must be not more than 20 percent when sodium sulfate is used or more than 25 percent when magnesium sulfate is used.

(iii) Rock type 3

• Bulk specific gravity (saturated surface-dry basis)—Not less than 2.3 when tested in accordance with ASTM D6473 on samples prepared as described for soundness testing.

• Absorption—Not more than 4 percent when tested in accordance with ASTM D6473 on samples prepared as described for soundness testing.

• Soundness—The weight loss in 5 cycles must be not more than 20 percent when sodium sulfate is used or more than 25 percent when magnesium sulfate is used.

C. Methods of Soundness Testing

(1) Rock cube soundness—

(i) The sodium or magnesium sulfate soundness test for all rock types (1, 2, or 3) must be performed on a test sample of 5,000 ± 300 grams of rock fragments, reasonably uniform in size and cubical in shape, and weighing, after sampling, about 100 grams each. They must be obtained from rock samples that are representative of the total rock mass, as noted in ASTM D4992, and that have been sawed into slabs as described in ASTM

523-2

D5121. The samples must further be reduced in size by sawing the slabs into cubical blocks. The thickness of the slabs and the size of the sawed fragments must be determined by the size of the available test apparatus and as necessary to provide, after sawing, the approximate 100-gram samples. The cubes must undergo five cycles of soundness testing in accordance with ASTM C88.

(ii) Internal defects may cause some of the cubes to break during the sawing process or during the initial soaking period. Do not test any of the cubes that break during this preparatory process. Such breakage, including an approximation of the percentage of cubes that break, must be noted in the test report.

(iii) After the sample has been dried following completion of the final test cycle and washed to remove the sodium sulfate or magnesium sulfate, the loss of weight must be determined by subtracting from the original weight of the sample the final weight of all fragments that have not broken into three or more fragments.

(iv) The test report must show the percentage loss of the weight and the results of the qualitative examination.

(2) Rock slab soundness—

(i) When specified, the rock must also be tested in accordance with ASTM D5240.

Deterioration of more than 25 percent of the number of blocks must be cause for rejection of rock from this source. Rock must also meet the requirements for average percent weight loss stated below.

(ii) For projects located north of the Number 20 Freeze-Thaw Severity Index Isoline (fig.

523–1 below), unless otherwise specified, the average percent weight loss for Rock Type 1 must not exceed 20 percent when sodium sulfate is used or 25 percent when magnesium sulfate is used. For Rock Types 2 and 3, the average percent weight loss must not exceed 25 percent for sodium sulfate soundness or 30 percent for magnesium sulfate soundness.

(iii) For projects located south of the Number 20 Freeze-Thaw Severity Index Isoline, unless otherwise specified, the average percent weight loss for Rock Type 1 must not exceed 30 percent when sodium sulfate is used or 38 percent when magnesium sulfate is used.

For Rock Types 2 and 3, the average percent weight loss must not exceed 38 percent for sodium sulfate soundness or 45 percent for magnesium sulfate soundness.

523-3

Figure 523–1 Isoline Map of the Freeze-Thaw Severity Index for Contiguous 48 United States (map is from ASTM D5312)

D. Field Durability Inspection

(1) Rock that fails to meet the material requirements stated above (if specified), may be accepted only if similar rock from the same source has been demonstrated to be sound after 5 years or more of service under conditions of weather, wetting and drying, and erosive forces similar to those anticipated for the rock to be installed under this specification.

(2) A rock source may be rejected if the rock from that source deteriorates in less than 5 years under similar use and exposure conditions expected for the rock to be installed under this specification, even though it meets the testing requirements stated above.

(3) Deterioration is defined as the loss of more than one-quarter of the original rock volume, or severe cracking that would cause a block to split. Measurements of deterioration are taken from linear or surface area particle counts to determine the percentage of deteriorated blocks.

Deterioration of more than 25 percent of the pieces must be cause for rejection of rock from the source.

E. Grading

The rock must conform to the specified grading limits after it has been placed within the matrix of the rock riprap. Grading tests must be performed, as necessary, according to ASTM D5519, Method A, B, or C, as applicable.

(210-642-H, 2nd Ed., Feb 2022) 521-1

Part 642 – Specifications

Chapter 3 – National Standard Material Specifications

Material Specification 521—Aggregates for Drainfill and Filters

A. Scope

This specification covers the quality of mineral aggregates for the construction of drainfill and filters.

B. Quality

(1) Drainfill and filter aggregates shall be sand, gravel, or crushed stone or mixtures thereof.

Aggregates shall be composed of clean, hard, durable, mineral particles free from organic matter, clay balls, soft particles, or other substances that would interfere with the free-draining properties of the aggregates.

(2) Coarse aggregate may be crushed limestone or other material that has limestone particles included. Aggregates from crushed limestone shall be thoroughly washed and screened to remove limestone dust, limestone fines, and fine soil particles. Limestone shall not be used for fine aggregates except in combination with other material, such that not more than 5 percent of the portion finer than the No. 4 sieve shall be limestone.

(3) Aggregates shall be tested for soundness according to ASTM C88 and shall have a weighted average loss in 5 cycles of not more than 12 percent when sodium sulfate is used or 18 percent when magnesium sulfate is used.

C. Grading

Drainfill and filter aggregates shall conform to the specified grading limits after being placed or after being compacted when compaction is specified. Grading shall be determined by ASTM C136. The percentage of material finer than the No. 200 sieve shall be determined by the method in ASTM C117.

D. Storing and Handling

Drainfill and filter aggregates shall be stored and handled by methods that prevent segregation of particle sizes or contamination by mixing with other material.