S01 Attachment 1 Specifications.pdf

ARS WOODWARD

EMBANKMENT

REHABILITATION

SPECIFICATION

PACKAGE

WOODWARD COUNTY,

OK

OKLAHOMA NRCS

August 2020

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ARS Woodward Rehabilitation August 2020

APPLICABLE SPECIFICATIONS

Construction Specifications

Site Preparation 2 Clearing and Grubbing 3 Structure Removal 5 Pollution Control 6 Seeding, Sprigging, and Mulching 7 Construction Surveys 8 Mobilization and Demobilization

Foundation Work 10 Water for Construction 11 Removal of Water

Earthwork 21 Excavation 23 Earthfill 24 Drainfill 26 Salvaging and Spreading Topsoil 27 Diversions and Waterways

Concrete and Reinforcement 31 Concrete for Major Structures 34 Steel Reinforcement 36 Roller Compacted Concrete

Pipe Conduits and Drains 41 Reinforced Concrete Pressure Pipe Conduits 45 Plastic (PVC, PE, HDPE, ABS) Pipe Conduits and Drains 52 Steel Pipe 54 Boring and Jacking

Riprap and Slope Protection 61 Rock Riprap

Water Control and Gates and Valves 71 Water Control Gates

Miscellaneous Structural Work 81 Metal Fabrication and Installation

Miscellaneous Construction 85 Slip-Lining 91 Chain Link Fence 92 Field Fences 94 Contractor Quality Control 95 Geotextile 99 Conduit Abandonment 230 Irrigation Pipeline, Plastic Pipeline 274 Soil Amendments (Gypsum)

ARS Woodward Rehabilitation August 2020

Material Specifications

Aggregates and Rock 521 Aggregates for Drainfill and Filters 522 Aggregates for Portland Cement Concrete 523 Rock for Riprap

Concrete Materials 531 Portland Cement 532 Supplementary Cementitious Materials 533 Chemical Admixtures for Concrete 534 Concrete Curing Compound 535 Preformed Expansion Joint Filler 536 Sealing Compound for Joints for Concrete and Concrete Pipe 539 Steel Reinforcement (for Concrete)

Non-Metal Pipe and Fittings 541 Reinforced Concrete Pressure Pipe 547 Plastic Pipe

Water Control Gates and Valves 554 Steel Pipe 571 Slide Gates

Miscellaneous Structural Materials 581 Metal 582 Galvanizing

Miscellaneous Construction Materials 591 Field Fencing Material 592 Geotextile

(210-VI-NEH, May 2001) 2–1

Construction Specification 2—Clearing and Grubbing

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

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

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

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

Any limbs or branches 0.5 inch or larger in diameter that are broken, severed, or otherwise seriously damaged during construction shall be cut off at the base of the damaged limb or branch flush with the adjacent limb or tree trunk. All roots 1-inch or larger in diameter that are cut, broken, or otherwise sev-ered during construction operations shall have the end smoothly cut perpendicular to the root. Roots exposed during excavation or other operations shall be covered with moist earth or backfilled as soon as possible to prevent the roots from drying out.

3. Marking The limits of the area(s) 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.

4. Clearing and grubbing All trees not marked for preservation and all snags, logs, brush, stumps, shrubs, rubbish, and similar materials shall be cleared 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 shall be grubbed out to a depth of at least 2 feet below subgrade for concrete structures and 1 foot below the ground surface at embank-ment sites and other designated areas.

5. Disposal All materials cleared and grubbed from the designated areas shall be disposed of at locations shown on the drawings or in a manner specified in section 7. The contractor is responsible for complying with all local rules and regulations and the payment of any and all fees that may result from disposal at locations away from the project site.

6. Measurement and payment Method 1—For items of work for which specific units prices are established in the contract, the cleared and grubbed area is measured to the nearest 0.1 acre. Payment for clearing and grubbing is made for the total area within the designated limits at the contract unit price. Such payment will constitute full com-pensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.

(210-VI-NEH, May 2001)

Method 2—For items of work for which specific unit prices are established in the contract, the length of the cleared and grubbed area is measured to the nearest full station (100 feet) along the line designated on the drawing or identified in the specifications. Payment for clearing and grubbing is made for the total length within the designated limits at the contract unit price. Such payment will constitute full compensation for all labor, equipment, tools, and all other items necessary and incidental to the comple-tion of the work.

Method 3—For items of work for which specific unit prices are established in the contract, each tree, stump, and snag having a diameter of 4 inches or larger and each log having a diameter of 4 inches or larger and a length of 10 feet are measured before removal. The size of each tree and snag is determined by measuring its trunk at breast height above the natural ground surface. The size of each log is deter-mined by measuring the butt and by measuring its length from butt to tip. The size of each stump is measured at the top. Diameter is determined by dividing the measured circumference by 3.14.

Payment for clearing and grubbing of each tree, stump, and snag having a diameter of 4 inches or larger and each log having a diameter of 4 inches or larger and a length of 10 feet or larger is made at the con-tract unit price for its size designation as determined by the following schedule:

Measured diameter Size designation

(in) (in)

4 to 8 6

8 to 12 10

12 to 24 18

24 to 36 30

36 to 60 48

Over 60 60

The sum of such payments shall constitute full compensation for clearing and grubbing (including the clearing and grubbing of smaller trees, stumps, snags, logs, brush, shrubs, and roots), applicable permits and associated fees, and rubbish removal. Such payment shall constitute full compensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.

Method 4—For items of work for which specific lump sum prices are established in the contract, pay-ment for clearing and grubbing is made at the contract lump sum price. Such payment shall constitute full compensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.

All Methods—The following provisions apply to all methods of measurement and payment. Compensa-tion for any item of work described in the contract, but not listed in the bid schedule 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 7.

7. Items of work and construction details

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OK – ARS WOODWARD

7. Items of work and construction details

Burning to dispose of timber shall be accomplished at such times and manner as to minimize the annoyance or discomfort of the inhabitants of the area. All precautions necessary to prevent burning of areas adjacent to the normal pool shall be used.

Open burning shall be in accordance with the Oklahoma Administrative Code (OAC) Open Burning Rule 252:100-13.

All materials cleared from the designated areas shall be burned, buried, or salvaged and become the property of the contractor.

Material shall not be buried at the following locations:

(a) Within the area bounded by 40 feet downstream of the downstream toe and 150 feet upstream of the upstream toe of the embankment.

(b) Within the auxiliary spillway area.

(c) Within 50 feet of the constructed outlet channel.

Buried material shall have a minimum earthfill cover of not less than 2 feet. The cover shall be placed in two lifts with each lift compacted by traversing the entire surface with one tread track of the material placement equipment. The top lift shall be mounded at least 6 inches higher than the surrounding undisturbed area to prevent unsightly depressions after settlement. The finished surface of the disposal area shall be uniformly graded to drain freely to prevent ponding of water.

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

a. Bid Item 1, Clearing and Grubbing

(1) This item consists of the clearing and grubbing and disposal of trees, snags, logs, brush, shrubs, stumps and rubbish for the areas herein described: (a) the areas bounded by a line forty (40) feet outside the lines of the embankment, (b) the base of all earthfills, (c) the embankment slopes, (d) borrow areas, and (e) the area in the outlet channel between the embankment and highway fence, including spoil areas.

(2) This item also consists of removing existing timber piles located within the work limits.

(3) The designated limits shall be the actual area marked as specified in Section 3 of this specification.

(4) In Section 6, Measurement and Payment, Method 4 will apply.

NRCS-11/17 2-4

Construction Specification 3—Structure Removal

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

2. Marking Method 1—Each structure or structure part to be removed will be marked with stakes, flags, paint, or other suitable method.

Method 2—The area boundaries from which structures must be removed will be marked using stakes, flags, paint, or other suitable method. Structures to remain undisturbed or to be salvaged will be desig-nated by special markings.

3. Removal Method 1—All structures designated for removal in the contract shall be removed to the specified ex-tent and depth.

Method 2—Within the areas so marked, all visible and buried structures identified shall be removed to the specified extent and depth.

4. Salvage Structures or structure parts that are designated to be salvaged shall be carefully removed and neatly placed in the specified or approved storage location. Salvaged structures that are capable of being disas-sembled shall be dismantled into individual members or sections. Such structures shall be neatly and systematically match marked with paint before disassembly. All connectors and other parts shall be marked to indicate their proper location within the structure and shall be fastened to the appropriate structural member or packed in suitable containers.

Material from fences designated to be salvaged shall be placed outside the work area on the property on which the fence was originally located. Fence wire shall be rolled into uniform rolls of suitable size and neatly piled with other salvaged materials. Posts and rails shall be neatly stacked.

5. Disposal of refuse materials Refuse materials resulting from structure removal shall be disposed of in a manner and at locations specified in section 7 of this specification or in an acceptable manner and at locations approved by the contracting officer. Disposal by burning shall be in accordance with local rules and regulations.

6. Measurement and payment Method 1—For items of work for which specific unit prices are established by the contract, payment for the removal of each structure unit, except fences, is made at the contract unit price. Fences removed or removed and salvaged are measured to the nearest linear foot. Payment for fence removal or removal and salvage is made at the contract unit prices for each type and size of fence.

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

Method 2—For items of work for which specific lump sum prices are established by the contract, pay-ment for structure removal is made at the contract lump sum price.

3–1

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

All Methods—The following provisions apply to all methods of measurement and payment. Compensa-tion for any item of work described in the contract, but not listed 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 7 of this specification.

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7. Items of work and construction details

Buried material shall have a minimum earthfill cover of not less than 2 feet. The cover shall be placed in two lifts with each lift compacted by traversing the entire surface with one tread track of the material placement equipment. The top lift shall be mounded at least 6 inches higher than the surrounding undisturbed area to prevent unsightly depressions after settlement. The finished surface of the disposal area shall be uniformly graded to prevent ponding of water.

a. Bid Item 2, Structure Removal

(1) This item consists of removal of the existing principal spillway inlet, inlet trash guard, specified segments of the conduit, power lines/poles to the existing pump, the existing container for pump and any associated appurtenances

(2) This item also consists of removing the concrete auxiliary spillway structure and the existing concrete inside dike.

(3) In Section 2, Marking, Method 1 will apply.

(4) In Section 3, Removal, Method 1 will apply

(5) All material removed, except for the concrete from the auxiliary spillway, shall be burned, buried in the designated waste area, or salvaged and become the property of the contractor.

(6) The concrete from the auxiliary spillway shall become the property of the contractor and removed from the site.

(7) In Section 6, Measurement and Payment, Method 2 will apply.

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

(a) Fence Removal – Construction Specification 3,

(b) Excavation, Common, P.S. and Drain Pipe Abandonment – Construction Specification 21, and

(c) Earthfill, P.S. and Drain Pipe Abandonment – Construction Specification

23.

b. Subsidiary Item, Fence Removal

(1) This item consists of the removal of existing fences and fence remnants marked by Method 1 as specified in Section 2 of this specification as necessary to prosecute work.

(2) In Section 3, Removal, Method 1 will apply.

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(3) All material removed shall be burned, buried, or salvaged and become the property of the contractor.

(4) No separate payment will be made for fence removal. Compensation for this item will be included in the payment for Bid Item 2, Structure Removal.

c. Subsidiary Item, Wave Berm Riprap and Bedding Removal

(1) This item consists of removing the riprap and bedding on the wave berm where the existing principal spillway and drain pipe will be grouted and where the new principal spillway conduit will be bored and jacked.

(2) The existing wave berm riprap and bedding shall not be removed beyond the excavation limits shown on the drawings

(3) All wave berm riprap and bedding removed shall be wasted in the areas shown on the drawings.

(4) No separate payment will be made for Wave Berm Riprap and Bedding Removal.

Compensation for this item will be included in the payment for Bid Item 22, Wave Berm Riprap.

5–1(210–VI–NEH, January 2014)

1. Scope 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.

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

— mulch and compost materials

— erosion control materials

— fertilizers

— dust suppressants

— agricultural spray adjuvants

2. Material Silt fence shall conform to the requirement of Materials Specification 592, Geotextile. All other material furnished shall meet the requirements of the material specifications listed in section 8 of this specification.

3. Erosion and sediment control measures and works The measures and works shall include, but are not limited to, the following:

Staging of earthwork activities—The excavation and moving of soil materials shall be scheduled to minimize the size of areas disturbed and unprotected from erosion for the shortest reasonable time.

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

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

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

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

Sediment basins—Sediment basins collect, settle, and eliminate sediment from eroding areas from impacting properties and streams below the construction site(s). These basins are temporary and shall be removed and the area restored to its original condition when they are no longer required or when permanent measures are installed.

Sediment filters—Straw bale filters or geotextile silt fences trap sediment from areas of limited runoff. Sediment filters shall be properly anchored to prevent erosion under or around them. Silt fences shall be installed and main-tained in accordance with ASTM D6462. These filters are temporary and shall be removed and the area restored to its original condition when they are no longer required or when permanent measures are installed.

Waterways—Waterways for the safe disposal of runoff from fields, diversions, and other structures or measures.

These works are temporary and shall be removed and the area restored to its original condition when they are no longer required or when permanent measures are installed.

Construction Specification 5—Pollution Control

5–2 (210–VI–NEH, January 2014)

Other—Additional protection measures as specified in section 8 of this specification or required by Federal, State, or local government.

4. Chemical pollution The contractor shall 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 washwater, or asphalt, produced as a by-product of the construction activities. Pollutants shall be disposed of in accordance with appropriate state and Federal regulations. At the completion of the construction work, tanks, barrels, and sumps shall be removed and the area restored to its original condition as specified in sec-tion 8 of this specification. Sump removal shall be conducted without causing pollution.

Sanitary facilities, such as chemical toilets, or septic tanks shall not be located next to live streams, wells, or springs. They shall be located at a distance sufficient to prevent contamination of any water source. At the comple-tion of construction activities, facilities shall be disposed of without causing pollution as specified in section 8 of this specification.

5. Air pollution The burning of brush or slash and the disposal of other materials shall adhere to state and local regulations.

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

All public access or haul roads used by the contractor during construction of the project shall be sprinkled or otherwise treated to fully suppress dust. All dust control methods shall ensure safe construction operations at all times. If chemical dust suppressants are applied, the material shall be a commercially available product specifically designed for dust suppression and the application shall follow manufacturer's requirements and recommendations.

A copy of the product data sheet and manufacturer's recommended application procedures shall be provided to the engineer 5 working days before the first application.

6. Maintenance, removal, and restoration All pollution control measures and temporary works shall be adequately maintained in a functional condition for the duration of the construction period. All temporary measures shall be removed and the site restored to near original condition.

7. Measurement and payment Method 1—For items of work for which specific unit prices are established in the contract, each item is measured to the nearest unit applicable. Payment for each item is made at the contract unit price for that item. For water or chemical suppressant items used for dust control for which items of work are established in section 8 of this speci-fication, measurement for payment will not include water or chemical suppressants that are used inappropriately or excessive to need. Such payment will constitute full compensation for the completion of the work.

Method 2—For items of work for which lump sum prices are established in the contract, payment is made as the work proceeds and 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 compensa-tion for completion of the work.

Method 3—For items of work for which lump sum prices are established in the contract, payment will be prorated and provided in equal amounts on each monthly progress payment estimate. The number of months used for pro-rating shall be the number estimated to complete the work as outlined in the contractor's approved construction schedule. The final month's prorate amount will be provided with the final contract payment. Payment as described will constitute full compensation for completion of the work.

5–3(210–VI–NEH, January 2014)

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 8 of this specification.

8. Items of work and construction details

5–4 (210–VI–NEH, January 2014)

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OK –ARS WOODWARD

8. Items of work and construction details

The term “CO” in this document refers to the Contracting Officer or their approved designee(s).

The work limits identified by the drawing encompass an area larger than one (1) acre and construction site is subject to the permit requirements of Oklahoma Pollution Discharge Elimination System (OPDES) administered by the Oklahoma Department of Environmental Quality (ODEQ). Rules for the OPDES process relative to construction sites are contained in the General Permit OKR10 for storm water discharges from construction activities within the state of Oklahoma, September 13, 2012.

In conformance with OPDES requirements, a Storm Water Pollution Prevention Plan (SWPPP) is required for this construction site. The Contractor shall provide the SWPPP according to ODEQ requirements. The SWPPP and permits will be provided to the CO prior to issuance of the Notice to Proceed. A copy of the approved SWPPP will be maintained at the construction site by the CO. OPDES also requires a Notice of Intent (NOI) and Notice of Termination (NOT) to be filed with ODEQ. The contractor shall submit a copy of the Notice of Termination (NOT) to the contracting officer during the same timeframe the NOT is submitted to ODEQ. If ODEQ doesn’t grant the termination of the permit, the contractor shall then contact the CO to initiate the process of transferring the operator of the permit from the contractor to the Oklahoma Conservation Commission.

In conformance with OPDES requirements, periodic joint inspections of the sediment control practices will be accomplished by the CO and the Contractor. Inspections will be conducted bi-weekly and within 24 hours of any rainfall event of more than 0.5 inches at the construction site.

After each inspection, a written report will be prepared and signed by the inspector which summarizes the status of inspected items. The report will (a) evaluate effectiveness, (b) identify maintenance needs and/or (c) recommend remedial corrective action and will be signed by the CO and the Contractor. Maintenance needs and/or remedial corrective action will be completed within 7 days of the inspection unless weather prohibits work.

a. Bid Item 3, Pollution Control

(1) This item consists of the Contractor preparing the Storm Water Pollution

Prevention Plan (SWPPP) prior to construction activities. The Contractor shall obtain the storm water construction general permit (OKR10) from the Oklahoma Department of Environmental Quality for storm water discharges.

(2) The Contractor shall provide the CO a copy of their SWPPP with the approved general permit prior to beginning any construction activities.

(3) The Contractor shall be responsible for permit requirements during construction.

(4) The Contractor shall be responsible to pay fines levied by the Oklahoma

Department of Environmental Quality which result from the Contractor not installing, maintaining, and/or repairing pollution prevention measures identified in the Contractor’s storm water pollution prevention plan.

(5) Sediment control measures shall be furnished, installed and maintained to limit

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the amount of sediment from ingress/egress roads, haul roads, parking areas, stock piles, earthfill and excavation activities, and other pollution sources created by the Contractor. This includes the final removal and restoration of each location.

(6) Chemical toilets used during construction shall be removed from the site and disposed of in conformance with state and local regulations.

(7) Sump pits with liners or containers shall be used during construction to collect fuel spills and storage of chemical pollutants, such as petroleum products. All containers, liners, and pollutants shall be removed from the site. The removal shall include materials used to line the pit and any soils contaminated. All pollutants, containers, and/or polluted soils shall be removed and disposed of in conformance with federal, state and local regulations. A written plan to satisfactorily collect and dispose of pollutants such as oil spills from equipment, fuel spills at refueling facilities, anti-freeze, and other chemical pollutants will be provided to the CO prior to the issuance of a notice to proceed.

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

(210-VI-NEH, Amend. 2, Sept. 2018) 6–1

Construction Specification 6—Seeding, Sprigging, and Mulching

1. Scope 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.

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

— Mulch and compost materials

— Erosion control materials

— Fertilizers

— Agricultural spray adjuvants

2. Material Seed—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 7.

Seed must be labeled in accordance with State laws and 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 may be accepted with a test date of more than 9 months before the date of delivery to the site.

Seed that has become wet, moldy, or otherwise damaged in transit or storage will not be accepted. The percent of noxious weed seed allowable 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.

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.

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, except that four times the amount must be used when seed is applied using a hydraulic seeder. Seed must be sown within 24 hours of treatment and must not remain in the hydraulic seeder longer than 4 hours.

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 meeting current requirements of the State department of agriculture.

Other soil amendments must meet quality criteria and application requirements specified in section 7.

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. Nonasphaltic tackifiers required because of environmental considerations must be as specified in section 7.

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 7. The mulch material must be air-dry, 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.

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.

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

6–2 (210-VI-NEH, Amend. 2, Sept. 2018)

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

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

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

Seedbed preparation must be discontinued when soil moisture conditions are not suitable for the preparation of a satisfactory seedbed as determined by the responsible engineer.

5. Seeding, sprigging, fertilizing, mulching, and stabilizing All seeding or sprigging operations must be performed 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 7. Unless otherwise specified, seeding or sprigging must be accomplished within 2 days after final grading is completed and approved.

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

The rate, amount, and kind of mulching or mesh must be as specified in section 7. Mulches must be applied uniformly to the designated areas. They must be applied to areas seeded not later than 2 working days after seeding has been performed. Straw mulch material must be stabilized 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 the equipment can be safely operated, it must be operated on the contour. Hand methods must be used where equipment cannot safely operate to perform the work required.

The tackifier must be applied uniformly over the mulch material at the specified rate, or it must be injected into the mulch material as it is being applied. Mesh or netting stabilizing materials 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 7.

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 refertilized, reseeded, and remulched before the new application of the mesh or netting.

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

When specified as an item of work, mesh or netting is measured to the nearest square yard of surface area covered and accepted.

Payment is made at the contract unit price and will constitute full compensation for completion of the work.

(210-VI-NEH, Amend. 2, Sept. 2018) 6–3

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 constitutes full compensation for the completion of the work.

Method 3—For items of work for which lump-sum prices are established in the contract, payment is made as the work proceeds.

Progress payments are determined as specified in section 7. Payment of the lump sum contract price constitutes full compensation for completion of the work.

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 7.

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7. Items of Work and Construction Details

a. Bid Item 4, Hydro-Seeding and Hydro-Mulching

(1) This item consists of site preparation and furnishing materials including fertilizing, mulch, tackifiers and seeding the specified grass seed mixture on disturbed areas as identified on the drawings or in the approved pollution prevention plan or other disturbed areas as directed by the Contracting Officer

(CO).

(2) Seed shall meet state quality standards. All seed analyses will be conducted in accordance with the Oklahoma Seed Law and Rules which specify the kind and amount of weed seed permitted, the requirements for a current analysis report and labeling of all seed to show its purity, germination, date of last germination test, and weed content.

(3) Native grass seed mixture specifications

* Inoculants required as specified in Section 2 of this specification.

(4) Seeding dates are December 1 to June 1.

SPECIES (select species and variety) PLS per

Acre (lbs/ac) Adapted Varieties

Little Bluestem Cimarron 1 Big Bluestem Kaw 1.5 Indiangrass Cheyenne 1.5 Switchgrass Blackwell 1.5 Sideoats Grama El Reno, Haskell 3 Blue Grama Hachita 2 Buffalograss Texoka (unhulled), Bison 3 Sand Lovegrass Mason, Bend 0.2 Tall Dropseed n/a 0.2 Green Sprangletop n/a 3

LEGUMES*

Illinois bundleflower 0.2 partridge pea 0.2 roundhead lespedeza 0.2 prairie clover 0.2

NRCS – 11/17 6-6

(5) Site Preparation - Prior to hydro-seeding, the area to be seeded must be in a condition suitable for application of the mulch material. Due to the nature of this site, tillage will not be required unless:

(a) Excess weedy competition is present which will interfere with proper application of seed/mulch material ensuring good soil contact. Tillage and/or mowing may be needed.

(b) Rills and gullies are present which need to be smoothed prior to seeding.

(c) Topsoil that has been compacted by construction equipment.

(6) Mulch shall be 100% wood fiber or a 70/30 blend of wood fiber and recycled paper. Tackifier shall be applied at manufacturers’ recommended rates. The mulch and tackifier, and their applications rates, shall be approved by the CO prior to placement.

A minimum mulch rate of 3,000 lbs per acre will be used.

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

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

(b) The fertilizer will be applied at the same time as the hydro-seeding operation by incorporating the fertilizer into the slurry.

(8) Hydroseeding will be applied in one of the following manner:

(a) The preferred method is a One-step Application: Mulch, tackifier, fertilizer, seed, and water shall be blended to a homogenous slurry, and applied in a one-step application. Seed shall be added just prior to application to prevent seed swelling.

(b) If a Two-step Application is used, mix the seed, fertilizer and enough fiber mulch to visually meter the application rate and uniformity. Immediately after the seeding application, apply the fiber mulch and tackifier slurry uniformly over the seeded area at the rates specified in Item (6) above.

(c) In Section 6, Measurement and Payment, Method 1will apply.

NRCS – 11/17 6-7

(d)

b. Bid Item 5, Hay Mulch

(1) This item consists of furnishing, placing and anchoring hay mulch on all the areas disturbed by construction activities.

(2) Hay mulch shall be free of noxious weed seeds and other invasive pests and shall consist of native prairie, weeping lovegrass, introduced bluestem, or fescue. Hay mulch should have been harvested at a time when stems are available.

(3) Mulch shall be applied in a reasonably continuous unbroken cover of uniform thickness at a rate of not less than 1 lb/sq. yd. (approximately 2 1/2 tons). Area of coverage shall be a minimum of 80% of the soil surface covered.

(4) Timing of Mulching Operation

(a) Mulch shall be applied after planting operations if construction is completed during time frame for establishing permanent vegetation. If construction is completed outside the timeframe for establishing vegetation, mulch shall be applied to provide for erosion control.

(b) Mulch will be anchored into the soil to a minimum depth of 2 inches by pinning, crimping, or other methods approved by the contracting officer.

Anchoring shall be done on the approximate contour at a spacing of no more than 8 inches and set to run straight. The operation shall be such that approximately 50% of the mulch material remains on the soil surface after anchoring. The mulch shall be anchored within the same day as spreading.

(5) Measurement and payment will be by Method 1.

NRCS – 11/17 6-8

7–1(210–VI–NEH, January 2009)

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

2. Equipment and material Equipment for construction surveys shall be of a quality and condition to provide the required accuracy. The equip-ment shall be maintained in good working order and in proper adjustment at all times. Records of repairs, calibra-tion tests, accuracy checks, and adjustments shall be maintained and be available for inspection by the engineer.

Equipment shall be checked, tested, and adjusted as necessary in conformance with manufacturer's recommenda-tions.

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

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

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

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

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

The elevations of permanent and temporary bench marks shall be determined and recorded to the nearest 0.01 foot. Differential leveling and transit traverses shall be of such precision that the error of vertical closure in feet shall not exceed plus or minus 0.1 times the square root of the traverse distance in miles. Linear measurements shall be accurate to within 1 foot in 5,000 feet, unless otherwise specified in section 9 of this specification. The an-gular error of closure for transit traverses shall not exceed 1 minute times the square root of the number of angles turned.

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

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

Construction Specification 7—Construction Surveys

7–2 (210–VI–NEH, January 2009)

Elevations for concrete work, pipes, and mechanical equipment shall be determined and recorded to the nearest

0.01 foot. Elevations for earth work shall be determined and recorded to the nearest 0.1 foot.

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

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

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

Method 1—Contractor performed surveys shall include:

• checking and any supplemental or interim staking

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

• other surveys as described in section 9 of this specification

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

• establishing line and grade for all work

• setting slope stakes for all work

• checking and any supplemental or interim staking

• establishing final grade stakes

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

• other surveys as described in section 9 of this specification

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

• establishing line and grade for all work

• setting slope stakes for all work

• checking and any supplemental or interim staking

• establishing final grade stakes

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

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

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

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

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

7–3(210–VI–NEH, January 2009)

Excavation and fill—Slope stakes shall be placed at the intersection of the specified slopes and ground line.

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

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

7. Records All survey data shall be recorded in fully identified standard hard-bound engineering survey field notebooks with consecutively numbered pages. All field notes and printed data shall include the purpose or description of the work, the date the work was performed, weather data, sketches, and the personnel who performed and checked the work. Electronically generated survey data and computations shall be bound, page numbered, and cross ref-erenced in a bound field notebook containing the index for all survey activities. All work shall follow recognized professional practice.

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

Complete documentation of computations and supporting data for progress payments shall be submitted to the en-gineer with each invoice for payment as specified in section 9 of the specification.