C04 12FPC326B0016 Attachment 3 Kalispel Dike Repair_Construction and Material Specs.pdf

NRCS CONSTRUCTION & MATERIAL

SPECIFICATIONS

FOR

KALISPEL TRIBE DIKE REPAIR

USDA-NRCS WASHINGTON

Spokane Valley, Washington

June 2026

Table of Contents Construction Specification 2 — Clearing and Grubbing Construction Specification 3 — Structure Removal Construction Specification 5 — Pollution Control Construction Specification 6 — Seeding, Sprigging, and Mulching Construction Specification 8 — Mobilization and Demobilization Construction Specification 10 — Water for Construction Construction Specification 11 — Removal of Water Construction Specification 21 — Excavation Construction Specification 23 — Earthfill Construction Specification 26 — Topsoiling Construction Specification 51 — Corrugated Metal Pipe Construction Specification 61 — Rock Riprap Construction Specification 81 — Metal Fabrication and Installation Construction Specification 82 — Painting Metalwork Construction Specification 94 — Contractor Quality Control Construction Specification 95 — Geotextile Material Specification 523—Rock for Riprap Material Specification 551—Coated Corrugated Steel Pipe Material Specification 581—Metal Material Specification 592—Geotextile

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Construction Specification 2 — Clearing and Grubbing Title 210 – Engineering Part 642 – Specifications for Construction Contracts Subpart B – National Construction Specifications June 2024 A. Scope

1. The work consists of clearing and grubbing and disposal of trees, snags, logs, brush, stumps, shrubs, and rubbish from the designated areas.

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, vehicular parking, and excessive foot or vehicular 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. All roots 1 inch or larger in diameter that are cut, broken, or otherwise severed during construction operations must have the ends smoothly cut perpendicular to the root. Roots exposed during excavation or other operations must be covered with moist earth or backfilled as soon as possible to prevent the roots from drying out.

C. Marking

1. The limits of the areas to be cleared and grubbed will be marked by stakes, flags, tree markings, or other suitable methods. Trees to be left standing and uninjured will be designated by special markings placed on the trunk about 6 feet above the ground surface.

D. Clearing and Grubbing

1. Clear all trees not marked for preservation and all snags, logs, brush, stumps, shrubs, rubbish, and similar materials from within the limits of the designated areas. Unless otherwise specified, all stumps, roots, and root clusters that have a diameter of 1 inch or larger must be grubbed out to a depth of at least 2 feet below the subgrade for concrete structures and 1 foot below the ground surface at embankment sites and other designated areas.

E. Disposal

1. Dispose of all materials cleared and grubbed from the designated areas at locations shown on the drawings or in a manner specified in Section G. The contractor is responsible for complying with all local rules and regulations and the payment of any fees that may result from disposal at locations away from the project site.

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F. Measurement and Payment

1. 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 will be included in the payment for the item of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in Section G.

G. Items of Work and Construction Details Items of work to be performed in conformance with this specification and construction details are:

a. Subsidiary to Bid Item 7, Excavation, Common

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Construction Specification 3 — Structure Removal Title 210 – Engineering Part 642 – Specifications for Construction Contracts Subpart B – National Construction Specifications June 2024

A. Scope

1. The work consists of the removal, salvage, and disposal of structures (including fences) from the designated areas.

B. Marking

1. Method 1. Each structure or structure part to be removed will be marked with stakes, flags, paint, or other suitable methods.

C. Removal

1. Method 1. Remove all structures designated for removal in the contract to the specified extent and depth.

D. Salvage

1. Structures or structure parts that are designated to be salvaged must be carefully removed and neatly placed in the specified or approved storage location. Salvaged structures that are capable of being disassembled must be dismantled into individual members or sections. Such structures must be neatly and systematically matchmarked with paint before disassembly. Mark all connectors and other parts to indicate their proper location within the structure and fasten to the appropriate structural member or packed in suitable containers.

2. Material from fences designated to be salvaged must be placed outside the work area on the property that the fence was originally located. Fence wire must be rolled into uniform rolls of suitable size and neatly piled with other salvaged materials. Neatly stack posts and rails.

E. Disposal of Refuse Materials

1. Dispose of refuse materials resulting from structure removal in a manner and at locations specified in Section G of this specification or in an acceptable manner and at locations approved by the contracting officer. Disposal by burning must be in accordance with local rules and regulations.

F. Measurement and Payment

1. Method 2.

a. For items of work for which specific lump-sum prices are established by the contract, payment for structure removal is made at the contract lump-sum price.

b. Such payment will constitute full compensation for all labor, equipment, tools, applicable permits and associated fees for burning and disposal of refuse, and other items necessary and incidental to the completion of the work.

2. 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 as a contract line-item number 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 are made subsidiary are identified in Section G of this specification.

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G. Items of Work and Construction Details

a. Bid Item 6, Structure Removal

(1) This item must consist of the following:

a. Careful removal, and temporary storage, of the existing CMP pipeline and anti-seep collars.

b. Care must be taken during the removal and any request to replace material needs the approval of the COR.

c. Salvage, and reuse, of the Waterman Flap gate is required and any seal replacement is included in this bid item.

d. Temporary storage area will be determined in the field by the COR.

e. If the CMP cannot be salvaged, as determined by the COR, then the CMP becomes the property of the contractor for disposal.

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Construction Specification 5 — Pollution Control

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

A. Scope

1. The work consists of installing measures or performing work to control erosion and minimize the production of sediment and other pollutants to water and air from construction activities.

2. The following BioPreferred® product categories are applicable to this specification:

a. Mulch and compost materials

b. Erosion control materials

c. Fertilizers

d. Dust suppressants

e. Agricultural spray adjuvants

B. Material

1. Silt fence conform to the requirement of Materials Specification 592, Geotextile. All other material furnished meet the requirements of the material specifications listed in Section G of this specification.

2. Erosion and Sediment Control Measures and Works. The measures and works includes, but are not limited to, the following:

a. Staging of Earthwork Activities. Scheduling the excavation and moving of soil materials to minimize the size of areas disturbed and unprotected from erosion for the shortest reasonable time.

b. Seeding. Seeding to protect disturbed areas occur as soon as reasonably possible following completion of that earthwork activity.

c. Mulching. Mulching to provide temporary protection of the soil surface from erosion.

d. Diversions. Diversions to divert water from work areas and to collect water from work areas for treatment and safe disposition. These are temporary and must be removed and the area restored to its near-original condition when the diversions are no longer required or when permanent measures are installed.

e. Stream Crossings. Culverts or bridges where equipment must cross streams. These are temporary must and be removed and the area restored to its near-original condition when the crossings are no longer required or when permanent measures are installed.

f. Sediment Basins. Sediment basins for collecting, settling, and eliminating sediment from eroding areas that impact properties and streams below the construction sites. These basins are temporary and must be removed and the area restored to its original condition when they are no longer required or when permanent measures are installed.

g. Sediment Filters. Straw bale filters or geotextile sediment fences for trapping sediment from areas with limited runoff. Sediment filters must be properly anchored to prevent erosion under or around them. Silt fences must be installed and maintained in accordance with ASTM D6462. These filters are temporary and must be removed and the area restored to its original condition when they are no longer required or when permanent measures are installed.

h. Waterways. Waterways for the safe disposal of runoff from fields, diversions, and other structures or measures. These works are temporary and must be removed and the area

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restored to its original condition when they are no longer required or when permanent measures are installed.

i. Other. Additional protection measures as specified in Section G of this specification or required by the federal, state, or local government.

C. Chemical Pollution

1. The contractor must provide watertight tanks or barrels or construct a sump sealed with plastic sheets to collect and temporarily contain chemical pollutants, such as drained lubricating or transmission fluids, grease, soaps, concrete mixer wash water, or asphalt, produced as a by-product from the construction activities. Dispose of pollutants in accordance with appropriate state and federal regulations. At the completion of the construction work, remove tanks, barrels, and sumps and restore the area to its original condition as specified in Section H of this specification. Sump removal must be conducted without causing pollution.

2. Sanitary facilities, such as chemical toilets, and septic tanks must not be located next to live streams, wells, or springs. They must be located at a distance sufficient to prevent contamination of any water source. At the completion of construction activities, facilities must be disposed of without causing pollution as specified in Section H of this specification.

D. Air Pollution

1. The burning of brush or slash and the disposal of other materials must adhere to state and local regulations.

2. Fire prevention measures must be taken to prevent the start or spreading of wildfires that may result from project activities. Firebreaks or guards must be constructed and maintained at locations shown on the drawings.

3. All public access or haul roads used by the contractor during construction of the project must be sprinkled or otherwise treated to fully suppress dust. All dust control methods must ensure safe construction operations at all times. If chemical dust suppressants are applied, the material must be a commercially available product specifically designed for dust suppression, and the application must follow the manufacturer’s requirements and recommendations. A copy of the product data sheet and manufacturer’s recommended application procedures must be provided to the engineer 5 working days before the first application.

E. Maintenance, Removal, and Restoration

1. All pollution-control measures and temporary works must be adequately maintained in a functional condition for the duration of the construction period. Remove all temporary measures and restore the site to near-original condition.

F. Measurement and Payment

1. Method 2. For items of work for which lump-sum prices are established in the contract, payment is made as the work proceeds and is supported by invoices presented by the contractor that reflect actual costs. If the total of all progress payments is less than the lump-sum contract price for this item, the balance remaining for this item will be included in the final contract payment. Payment of the lump-sum contract price will constitute full compensation for completion of the work.

2. All Methods. The following provisions apply to all methods of measurement and payment.

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

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a. Subsidiary to Bid Item 1, Mobilization and Demobilization

b. Bid Item 4, Soil Erosion and Pollution Control

a. Staging area near Cusick Meadows Road will have a perimeter of silt fence, with opening for access, installed to a 6-inch depth to accommodate all vehicles, length determined by the contractor.

b. Staging area near Cusick Meadows Road will have a spill prevention plan, submitted 14 days prior to mobilization.

c. Staging area near Cusick Meadows will have a fuel/oil spill kit capable of addressing any spills from the equipment used in construction. This must be addressed in the spill prevention plan.

d. Staging area near the dike construction area will have a silt fence installed to 6-inch depth and will accommodate all on-site vehicles. Will have drive in access point at highest level.

e. Staging area near the dike construction will need a spill kit similar to what is listed in the spill prevention plan for the staging area near Cusick Meadows Road. This must be addressed in the Spill Prevention Plan.

f. Demobilization will include removal of all silt fence, restoration to natural soil levels and seeded per specification 6.

g. Sediment fences must consist of a woven Geotextile conforming to Materials Specification 592, Class II with AOS no larger than the #30 sieve. The installed height of the fence must be approximately 30-inches with at least 6-inches anchored in the ground. Sediment must be removed from the fence whenever its depth exceeds one-third the height of the fence above ground.

(2) Additional Pollution Control Measures

a) The installer must develop Best Management Practices (BMP) to comply with all federal, state, and local construction stormwater quality rules for the construction site.

b) The BMP must consist of, but not limited to:

c) Temporary stockpiles of backfill material, borrow material, and all other materials must be stored in a location where it will not be subject to erosion from concentrated flow.

d) Site disturbance must be limited to the minimum amount of which is required to construct the projects works. No damage or removal of vegetation outside of this area must be allowed.

e) All accumulated sediment that has left the perimeter of the project must be retrieved.

f) Equipment tracks of the final pass over the completed earthworks must be perpendicular to the slope.

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Construction Specification 6 — Seeding, Sprigging, and Mulching

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

A. Scope

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

2. The following BioPreferred® product categories are applicable to this specification:

a. Mulch and compost materials

b. Erosion control materials

c. Fertilizers

d. Agricultural spray adjuvants

B. Material

1. Seed.

a. All seed must conform to the current rules and regulations of the state where it is being used and must be from the latest crop available. It must meet or exceed the standard for purity and germination listed in Section G.

b. Seed must 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.

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

2. Fertilizer. Unless otherwise specified, the fertilizer must be a commercial-grade fertilizer. It must meet the standard for grade and quality specified by state law. Where fertilizer is furnished from bulk storage, the contractor must furnish a supplier’s certification of analysis and weight. When required by the contract, a representative sample of the fertilizer must be furnished to the contracting officer for chemical analysis.

3. Inoculants. The inoculant for treating legume seeds must be a pure culture of nitrogen-fixing bacteria prepared specifically for the species and must not be used later than the date indicated on the container or as otherwise specified. A mixing medium, as recommended by the manufacturer, must be used to bond the inoculant to the seed. Two times the amount of the inoculant recommended by the manufacturer must be used (unless seed is applied using a hydraulic seeder;

then four times the amount must be used). Seed must be sown within 24 hours of treatment and must not remain in the hydraulic seeder longer than 4 hours.

4. Lime and Other Soil Amendments. Lime must consist of standard ground agriculture limestone or approved equivalent. Standard ground agriculture limestone is defined as ground limestone

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meeting current requirements of the state’s Department of Agriculture. Other soil amendments must meet quality criteria and application requirements specified in Section G.

5. Mulch Tackifiers. Asphalt emulsion tackifiers must conform to the requirements of ASTM D977, Specification for Emulsified Asphalt. The emulsified asphalt may be rapid setting, medium setting, or slow setting. Non-asphaltic tackifiers required because of environmental considerations must be as specified in Section G.

6. Straw Mulch Material. Straw mulch must consist of wheat, barley, oat or rye straw, hay, grass cut from native grasses, or other plants as specified in Section G. The mulch material must be air-dried reasonably light in color and must not be musty, moldy, caked, or otherwise of low quality.

The use of mulch that contains noxious weeds is not permitted. The contractor must provide a method satisfactory to the contracting officer for determining weight of mulch furnished.

7. Other Mulch Materials. Mulching materials, such as wood cellulose fiber mulch, mulch tackifiers, synthetic fiber mulch, netting, and mesh may be required for specialized locations and conditions. These materials, when specified, must be accompanied by the manufacturer’s recommendations for methods of application.

C. Seeding Mixtures, Sod, Sprigs, and Dates of Planting

1. The application rate per acre for seed mixtures, sprigs, or sod and the date of seeding or planting must be as shown on the plans or as specified in Section G.

D. Seedbed Preparation and Treatment

1. Dress areas to be treated to a smooth, firm surface. On sites where equipment can operate on slopes safely, adequately loosen and smooth the seedbed (4 to 6 inches deep). Depending on soil and moisture conditions, disking, cultipacking, or both, may be necessary to properly prepare a seedbed. Where equipment cannot operate safely, prepare the seedbed by methods like scarifying, providing a roughened soil surface by hand so that broadcast seed will remain in place.

2. 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.

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

4. Discontinue seedbed preparation when soil moisture conditions are not suitable for the preparation of a satisfactory seedbed as determined by the responsible engineer.

E. Seeding, Sprigging, Fertilizing, Mulching, and Stabilizing

1. Perform all seeding or sprigging operations in such a manner that the seed or sprigs are applied in the specified quantities uniformly in the designated areas. The method and rate of seed application must be as specified in Section G. Unless otherwise specified, seeding or sprigging must be accomplished within 2 days after final grading is completed and approved.

2. Apply fertilizer, lime, and other soil amendments as specified in Section G. When specified, the fertilizer and soil amendments must be thoroughly incorporated into the soil immediately following surface application.

3. The rate, amount, and kind of mulching or mesh must be as specified in Section G. Apply mulches uniformly to the designated areas. They must be applied to areas seeded not later than 2 working days after seeding has been performed. Stabilize straw mulch material within 24 hours of application using a mulch crimper or equivalent anchoring tool or by a suitable tackifier. When the mulch crimper or equivalent anchoring tool is used, it must have straight blades and be the type manufactured expressly for and capable of firmly punching the mulch into the soil. Where

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the equipment can be safely operated, it must be operated on the contour. Use hand methods where equipment cannot safely operate to perform the work required.

4. Apply the tackifier uniformly over the mulch material at the specified rate or inject it into the mulch material as it is being applied. Stabilizing materials like mesh or netting must be applied smoothly but loosely on the designated areas. The edges of these materials must be buried or securely anchored using spikes or staples as specified in Section G.

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

F. Measurement and Payment

1. 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.

2. All Methods. The following provisions apply to all methods of measurement and payment.

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

a. Bid Item 14, Seeding and Mulching

1) This item must consist of all work necessary to complete the seeding of the restored emergency spillway, emergency spillway embankments, spoil areas and CRP restoration area (i.e. Access Road) and all other disturbed areas staked by the engineer.

2) The grass seed mixtures must be drilled immediately after topsoil placement or disking and shaping of the CRP access road area, unless approved otherwise by the

COR.

3) The areas to be seeded must be shaped (including removal of rocks, weeds and debris), smoothed, and firmed enough to permit uniform seeding at the specified depth.

4) Hard compacted areas must be loosened sufficiently to permit proper seeding. Tilled areas and areas too loose for proper seeding must be packed sufficiently to permit uniform seeding at the specified depth.

5) On small areas where it is not feasible to operate equipment (as approved by the engineer), rocks, weeds and debris must be removed, and the area smoothed and packed by hand to provide an adequate seedbed.

6) All seeded area must be drilled crosswise to the general slope.

7) The grass seed mixture must be drilled with a grass drill equipped with double disc furrow openers, depth bands, packer wheel, and seed box agitators. Seeding depth must be from ¼ to ¾ - inch below the ground surface.

8) The grass seed mixture must contain not less than the following amounts of Pure Live Seed (PLS) per acre and will be uniformly drilled. Small areas, which preclude (as approved by engineer) the use of a grass drill, will be broadcast seeded, followed

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by raking or harrowing to insure seeds are covered by soil.

9) Mulch at a rate of 1,000-1,500 lbs per acre. Mulch must be anchored using either a straight disk anchoring tool or track of bulldozer running perpendicular to the slope of the dike.

Dike Embankment Critical Area Planting Rate (PLS) Species Lb/acre Smooth Bromegrass 8.0 Intermediate Wheatgrass 10.0

WRP/Access Road – Re-Seeding Rate (PLS) Species Lb/acre Tall Wheatgrass 13.5 Intermediate Wheatgrass 10.0 Alfalfa 6.5 Sweet Clover 4.0

**Areas that have been seeded then disturbed by the contractor’s operation must be repaired, reseeded at the contractor’s expense.

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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.

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

a. Bid Item 1, Mobilization and Demobilization

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Construction Specification 10 — Water for Construction

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

A. Scope

1. The work consists of furnishing, transporting, measuring, and applying water as specified.

B. Facilities and Equipment

1. The contractor must install and maintain access and haul roads and furnish, operate, and maintain all pumps, meters, piping, tanks, storage, and other facilities required to load, transport, store, distribute, and use construction water as specified.

2. These facilities must be equipped with accurate, work-dedicated meters; tanks of known volume;

or other devices that provide a correct measurement of water supplied. Meters must be installed at the point of delivery into water-hauling equipment or application systems, such as sprinkler systems or flooding systems, as specified.

C. Dust Abatement and Haul Road Maintenance

1. Water for dust abatement and haul road maintenance must be applied to haul roads and other dust-producing areas as needed to prevent air pollution or excessive dust (which causes impaired vision on trafficked roads and in work areas) and to maintain the roads in good condition for safe and efficient operation during periods of use. Roads that may be jointly used with the public and by the contractor’s equipment must have dust abatement provisions acceptable to the public entity that has road maintenance responsibility. Compensation for water used for dust abatement and haul road maintenance must be as specified in Section H of this specification.

D. Earthfill, Drainfill, and Rockfill

1. Water required for proper installation of earthfill, drainfill, or rockfill must be used in the fill materials as specified in the applicable construction specification(s). Compensation for construction water used for earthfill, drainfill and rockfill must be as specified in Section H of this specification.

E. Concrete, Mortar, and Grout

1. Water required in the mixing or curing of concrete, shotcrete, roller-compacted concrete, or other

Portland cement mortar or grout must meet the requirements of the applicable construction specifications and must be used in conformance with those specifications. Payment for construction water used in these items is covered by the applicable concrete, mortar, or grout specification, or a combination of these.

F. Other Construction Requiring Water

1. Water required and used for other construction activities under this contract but not specifically covered by this specification must be considered subsidiary to the item(s) of work that requires its use.

G. Measurement and Payment

1. All Methods.

a. The following provisions apply to all methods of measurement and payment:

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b. The measurement for payment will include all water used except as noted in Sections E, F, and H of this specification. Measurement for payment will not include water that is used inappropriately or in excess of that needed to accomplish the specified task.

c. 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 of this specification.

H. Items of Work and Construction Details

a. Subsidiary to Bid item 10, Earthfill

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Construction Specification 11 — Removal of Water Tile 210 – Engineering Part 642 – Specifications for Construction Contracts Subpart B – National Construction Specifications June 2024

A. Scope

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

B. Diverting Surface Water

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

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

C. Dewatering the Construction Site

1. Foundations, cutoff trenches, and all other parts of the construction site must be dewatered and kept free of standing water and muddy conditions as necessary for the proper execution of the work. The contractor must furnish, install, operate, and maintain all drains, sumps, pumps, casings, well points, and all other equipment required to properly dewater the site as specified.

Dewatering systems that cause a loss of soil fines from the foundation areas will not be permitted.

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

D. Dewatering Borrow Areas

1. The contractor must maintain all borrow areas free of surface water or otherwise provide for timely and effective removal of surface and subsurface water that accumulates within the borrow area unless waived in Section H of this specification. Process borrow material as necessary to achieve proper and uniform moisture content at the time of placement.

2. If pumping to dewater borrow areas is included as a bid item of work in the bid schedule, equip each pump discharge pipe with a water meter. The meter must be such that the measured quantity

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of water is accurate within 3 percent of the true quantity. The contractor must provide necessary support to perform accuracy tests of the water meter when requested by the contracting officer.

E. Erosion and Pollution Control

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

Pollution control activities must not conflict with the requirements of Construction Specification 5, Pollution Control, if it is a part of this contract.

F. Removal of Temporary Works

1. When temporary works are no longer needed, the contractor must remove and return the area to a condition similar to that which existed before construction. Areas where temporary works were located must be graded for sightly appearance and proper functioning and access to the installed works of improvement and may not obstruct natural surface waterflows. The contractor must exercise extreme care during the removal stages to minimize the loss of soil sediment and debris that was trapped during construction.

2. Pipes, casings, and any other material used to dewater the site must be removed from temporary wells. Fill the wells to ground level with clean gravel or other suitable material approved by the contracting officer. The contractor must exercise extreme care to prevent pollution of the ground water by these actions.

G. Measurement and Payment

1. Method 1.

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

Such payment will constitute full compensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.

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

H. Items of Work and Construction Details Items of work to be performed in conformance with this specification and construction details are:

a. Bid Item 6, Removal of Water

1) This item consists of the following:

a. Creating a coffer dam on the WRP side (NE) of the construction area to separate water from the dike construction.

b. Providing a dewatering plan, per Section C of this specification.

c. Installation of a sheet pile wall to keep water from Callispell Creek impacting excavation, soil placement, and the overall reconstruction of the dike.

d. This item includes enough pumping plant power to remove water during the entire excavation and reconstruction of the dike.

e. No standing water will be allowed during the compaction of soil for the reconstruction of the dike.

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Construction Specification 21 — Excavation

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

A. Scope

1. The work consists of the excavation required by the drawings and specifications, as well as the disposal of the excavated materials.

B. Classification

1. Excavation is classified as common excavation, rock excavation, or unclassified excavation in accordance with the following definitions.

2. Common excavation is defined as the excavation of all materials that (1) can be excavated, transported, and unloaded using heavy ripping equipment and wheel tractor-scrapers with pusher tractors or (2) can be excavated and dumped into place or loaded onto hauling equipment by excavators having a rated capacity of 1 cubic yard or larger and equipped with attachments (shovel, bucket, backhoe, dragline, or clam shell) appropriate to the material type, character, and nature of the materials.

3. Rock excavation is defined as the excavation of all hard, compacted, or cemented materials that require blasting or the use of ripping and excavating equipment larger than defined for common excavation. The excavation and removal of isolated boulders or rock fragments larger than 1 cubic yard encountered in materials otherwise conforming to the definition of common excavation must be classified as rock excavation. The presence of isolated boulders or rock fragments larger than 1 cubic yard is not in itself sufficient cause to change the classification of the surrounding material.

a. For the purpose of these classifications, the following definitions apply:

(1) Heavy ripping equipment is a rear-mounted, heavy-duty, single-tooth, ripping attachment mounted on a track-type tractor having a power rating of at least 250-flywheel horsepower, unless otherwise specified in Section J.

(2) A wheel tractor-scraper is a self-loading (not elevating) and unloading scraper having a struck-bowl capacity of at least 12 cubic yards.

(3) A pusher tractor is a track-type tractor having a power rating of at least 250-flywheel horsepower equipped with appropriate attachments.

4. Unclassified excavation is defined as the excavation of all materials encountered, including rock materials, regardless of their nature or the manner in which they are removed.

C. Blasting

1. The transportation, handling, storage, and use of dynamite and other explosives must be directed and supervised by someone of proven experience and ability who is authorized and qualified to conduct blasting operations.

2. Blasting must be done in a manner that prevents damage to the work or unnecessary fracturing of the underlying rock materials. It must conform to any special requirements in Section J of this specification. When specified in Section J, the contractor must furnish the engineer, in writing, a blasting plan before blasting operations begin.

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D. Use of Excavated Material

1. Method 1. To the extent they are needed, all suitable material from the specified excavations must be used in the construction of required permanent earthfill or rockfill. The suitability of material for specific purposes is determined by the engineer. The contractor must not waste or otherwise dispose of suitable excavated material.

E. Disposal of Waste Materials

1. Method 1. All surplus or unsuitable excavated materials are designated as waste and must be disposed of at the locations shown on the drawings.

F. Excavation Limits

1. Excavations must comply with the Occupational Safety and Health Administration Construction

Industry Standards Subpart P, Excavations, Trenching, and Shoring (29 CFR pt. 1926). All excavations must be completed and maintained in a safe and stable condition throughout the total construction phase. Structure and trench excavations must be completed to the specified elevations and to the length and width required to safely install, adjust, and remove any forms, bracing, or supports necessary for the installation of the work. Excavations outside the lines and limits shown on the drawings or specified herein are required to meet safety requirements and must be the responsibility of the contractor in constructing and maintaining a safe, stable excavation.

G. Borrow Excavation

1. When the quantities of suitable material obtained from specified excavations are insufficient to construct the specified earthfills and earth backfills, obtain additional material from the designated borrow areas. The extent and depth of borrow pits within the limits of the designated borrow areas are as specified in Section J or as approved by the engineer.

2. Borrow pits must be excavated and finally dressed to blend with the existing topography. They are sloped to prevent ponding and to provide drainage.

H. Over Excavation

1. Correct excavation in rock beyond the specified lines and grades by filling the resulting voids with Portland Cement concrete. Materials and mix proportions must be approved by the engineer.

Concrete that will be exposed to the atmosphere when construction is completed must meet the requirements of concrete selected for use under Construction Specification 31, Concrete for Major Structures, or 32, Structure Concrete, as appropriate.

2. Concrete that will be permanently covered must contain not less than five bags of cement per cubic yard. The concrete must be placed and cured as specified by the engineer.

3. Correct excavation in earth beyond the specified lines and grades by filling the resulting voids with approved compacted earthfill. The exception to this is that if the earth will become the subgrade for riprap, rockfill, sand or gravel bedding, or drainfill, the voids may be filled with material conforming to the specifications for the riprap, rockfill, bedding, or drainfill. Before correcting an over excavation condition, the contractor must review the planned corrective action with the engineer and obtain approval of the corrective measures.

I. Measurement and Payment

1. Method 1. The pay limits are as designated on the drawings.

2. All Methods. The following provisions apply to all methods of measurement and payment.

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

b. Payment for backfilling over excavation, as specified in Section H of this specification, is made only if the excavation outside specified lines and grades is directed by the engineer to remove unsuitable material and the unsuitable condition is not a result of the contractor’s improper construction operations as determined by the engineer.

c. 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 J of this specification.

J. Items of Work and Construction Details

a. Bid Item 7, Excavation Common

1) This item includes all excavation for the excavation of the dike to the lines a grades shown in the construction drawings.

2) If required, this item additionally includes excavation for the coffer dam.

3) Additional excavation information included in Construction Specification 51.

b. Bid Item 8, Borrow Excavation and Hauling

(1) This items includes all borrow excavation and hauling to the dike earthfill stockpile.

Location of the borrow site is noted on the construction drawings sheets 2 and 3.

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Construction Specification 23 — Earthfill

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

A. Scope

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

2. Earthfill is composed of natural earth materials that can be placed and compacted by construction equipment operated conventionally.

3. Earth backfill is composed of natural earth material placed and compacted in confined spaces or adjacent to structures (including pipes) by hand tamping, manually directed power tampers or vibrating plates, or their equivalent.

B. Material

1. All fill material must be obtained from required excavations and designated borrow areas. The selection, blending, routing, and disposition of material in the various fills must be subject to approval by the engineer.

2. Fill materials must contain no frozen soil, sod, brush, roots, or other perishable material. Rock particles larger than the maximum size specified for each type of fill must be removed prior to compaction of the fill.

3. The types of material used in the various fills must be as listed and described in the specifications and drawings.

C. Foundation preparation

1. Foundations for earthfill must be stripped to remove vegetation and other unsuitable material or must be excavated as specified.

2. Except as otherwise specified, earth foundation surfaces must be graded to remove surface irregularities and must be scarified parallel to the axis of the fill or otherwise acceptably scored and loosened to a minimum depth of 2 inches. The moisture content of the loosened material must be controlled as specified for the earthfill and the surface material of the foundation must be compacted and bonded with the first layer of earthfill as specified for subsequent layers of earthfill.

3. Earth abutment surfaces must be free of loose, uncompacted earth in excess of 2 inches in depth normal to the slope and must be at such a moisture content that the earthfill can be compacted against them to produce a good bond between the fill and the abutments.

4. Rock foundation and abutment surfaces must be cleared of all loose material by hand or other effective means and must be free of standing water when fill is placed upon them. Occasional rock outcrops in earth foundations for earthfill, except in dams and other structures designed to restrain the movement of water, must not require special treatment if they do not interfere with compaction of the foundation and initial layers of the fill or the bond between the foundation and the fill.

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5. Foundation and abutment surfaces must be no steeper than one horizontal to one vertical unless otherwise specified. Test pits or other cavities must be filled with compacted earthfill conforming to the specifications for the earthfill to be placed upon the foundation.

D. Placement

1. Earthfill must not be placed until the required excavation and foundation preparation have been completed and the foundation has been inspected and approved by…