WRP Dyer_Lake Specs Combined03092012.pdf

SpecList_Dyer_Co_WRP03092012.DOC Page 1 of 2

SPECIFICATION LIST

DYER COUNTY WETLAND RESERVE PROGRAM

DYER COUNTY, TENNESSEE

March 9, 2012

This specification covers the construction of three Wetland Reserve Program Sites in Dyer County, Tennessee and one Wetland Reserve Program Site in Lake County, Tennessee.

SPECIFICATION

NUMBER DESCRIPTION

CONSTRUCTION SPECIFICATIONS

2 Clearing and Grubbing

6 Seeding, Sprigging, and Mulching

8 Mobilization and Demobilization

10 Water for Construction

21 Excavation

23 Earthfill

32 Structure Concrete

34 Steel Reinforcement

51 Corrugated Metal Pipe

61 Rock Riprap

81 Metal Fabrication and Installation

83 Timber Fabrication and Installation

95 Geotextile

MATERIAL SPECIFICATIONS

522 Aggregates for Portland Cement Concrete

523 Rock for Riprap

Specification List Continued Dyer County Wetland Reserve Program Dyer County, Tennessee

SpecList_Dyer_Co_WRP03092012.DOC Page 2 of 2

531 Portland Cement

532 Mineral Admixtures for Concrete

533 Chemical Admixtures for Concrete

539 Steel Reinforcement for Concrete

552 Aluminum Corrugated Pipe

581 Metal

584 Structural Timber and Lumber

585 Wood Preservatives and Treatment

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

Any limbs or branches 0.5 inch or larger in diameter that are broken, severed, or otherwise seriously damaged during construction shall be cut off at the base of the damaged limb or branch flush with the adjacent limb or tree trunk. All roots 1-inch or larger in diameter that are cut, broken, or otherwise severed during 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 embankment 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

(210-VI-NEH, May 2001) (2-2) will constitute full compensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.

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 completion 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 determined 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 contract 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, payment 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.

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 7.

NRCS - Tennessee (2-3) Dyer and Lake Counties Wetland Reserve Program August 3, 2011

7. Items of work and construction details

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

a.

Clearing and Grubbing.

(1) This item includes all work described herein that is required to breach the levees in Dyer County WRP’s listed in this contract. This item consists of the clearing and grubbing required in order for levees to be breached. The work shall consist of removing and disposing of the trees, brush, stumps, roots, snags, logs, shrubs, leaves, vines, debris, trash, shingles, roofing materials, and rubbish in the area where the levee will be breached. Clearing and grubbing shall be completed prior to excavation and placing of spoil material.

(2) The Contractor shall clear and grub areas only within the work limit lines where necessary to perform the required work. The work limit lines will be marked in the field by Engineer or his/her representative. Care shall be taken not to damage any tree that is not designated for removal. Any vegetation and trees that are damaged that are outside of the work limit lines shall be removed and disposed of only if concurred by the Engineer and in a manner that is acceptable to the Engineer.

(3) In Section 5, Disposal, The Contractor shall dispose of all wood waste materials by burning. All precautions necessary to prevent the burning of areas adjacent to the work area shall be used. When conditions exist, such as high winds, extremely dry conditions, or climatic conditions that create heavy concentrations of smoke, burning will not be allowed. All burning shall be performed in conformance with all existing state and local laws. Burning will be allowed on the project sites at locations specified on the drawings or as approved in the field by the Engineer or his/her representative. Burn locations shall be chosen to protect existing vegetation, crops, the environment, property, and the public.

The Contractor shall keep sufficient labor and equipment in the immediate vicinity of his open burning operations that are capable of quickly containing and extinguishing any wildfires that may occur. The Contractor shall continuously watch all open burning operations until all fires have burned out or have been extinguished by water or covered by soil.

All excavation and earthfill related to the disposal operation shall be considered incidental to and subsidiary to clearing and grubbing.

(4) Open burning (see definition of “open burning” below) shall conform to the following conditions:

A. Appropriate permits shall be obtained before burning. Burn permits are normally required from the TN Division of Forestry from Oct 15 through May 15. Additional permit requirements may be imposed as conditions warrant.

B. Open burning locations shall be greater than two hundred feet (200’) from a

NRCS - Tennessee (2-4) Dyer and Lake Counties building.

C. The guidance in the brochure “Safe Debris Burning” from the Tennessee

Division of Forestry shall be followed.

D. Only wood waste (see definition of “wood waste below”) shall be burned.

Non-woody materials such as the following shall not be burned - tires and rubber products; vinyl siding and shingles; asphalt shingles and other asphalt roofing materials and demolition debris; building material; construction debris and mobile homes; plywood, oriented strand board and treated wood, including railroad ties; asbestos-containing materials, aerosol cans and food cans, copper wire and electrical wires, plastics and other synthetic materials;

paper products, cardboard and newspaper; household trash; leaves, branches and trees not grown on-site.

E. Priming materials used to facilitate such burning shall be limited to #1 or #2 grade fuel oils.

F. A traffic hazard shall not be caused by the air products generated by the fire.

G. No fire shall be ignited while any air pollution emergency episode is in effect in the area of the burn.

H. Compliance with all the requirements from any agency’s permit and with all other applicable requirements, ordinances, or restrictions is the Contractor’s responsibility and is mandatory.

I. Any debris and/or ashes left from burning operations shall be disposed of by burying at locations within the work limit line as approved by the Engineer.

All residue materials shall be buried at least two (2) feet below natural ground in a location that will NOT

J.

be under any structure or under any structural earthfill. Earthfill for disposal pits shall be compacted in a maximum of 12 inch lifts with two passes of the earthmoving equipment over the entire fill area to a height 6 inches above surrounding natural ground. All disturbed areas shall be smoothed, transitioned into natural ground, and left in a condition so that the areas can easily be traversed by motorized farm seeding equipment and sloped to drain toward the adjacent ground. .

K. A fire-proof zone shall be created around all burn piles of the width recommended by the TN Division of Forestry, but not less than 20 feet, The Contractor is solely liable and responsible for any and all damages and costs resulting from the burning operation and any resulting wildfire.

before burning is commenced.

“Open burning” is defined as the burning of any matter under such conditions that products of combustion are emitted directly into the open atmosphere without passing directly through a stack. Open burning includes, but is not limited to, fires located or burning in a pile on the ground, a barrel, a fire pit, or other semi-enclosure.

“Wood Waste” is defined for this contract as any product which has not lost its basic character as wood, such as bark, sawdust, chips and chemically untreated lumber whose “disposition” by open burning is to solely get rid of or destroy.

Plant life of an herbaceous nature, such as leaves, whether attached, fallen, and/or collected, evergreen needles, and grasses, will be allowed to be burned.

Additionally, manufactured lumber products, such as plywood, fiberboard, NRCS - Tennessee (2-5) Dyer and Lake Counties particleboard, and paneling, are not considered “wood waste”. Painted or artificially stained wood is not considered “wood waste”.

(5) In Section 5, Disposal, Any non-woody materials, including debris and rubbish, encountered or brought to the site by the Contractor or any Subcontractor shall be removed from the site and transported to a public landfill for disposal. The Contractor is responsible for all costs of disposal including tipping and other fees.

(6) In Section 6, Measurement and Payment, Clearing and Grubbing is subsidiary item to Excavation, Common, Levee Breach.

NRCS - Tennessee (2-6) Dyer and Lake Counties

THIS PAGE INTENTIONALLY LEFT BLANK

(210-VI-NEH, May 2001) (6-1)

Construction Specification 6—Seeding, Sprigging, and Mulching

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

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

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

Fertilizer—Unless otherwise specified, the fertilizer shall be a commercial grade fertilizer. It shall meet the standard for grade and quality specified by State law. Where fertilizer is furnished from bulk storage, the contractor shall furnish a supplier's certification of analysis and weight.

When required by the contract, a representative sample of the fertilizer shall be furnished to the contracting officer for chemical analysis.

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

Lime and other soil amendments—Lime shall consist of standard ground agriculture limestone, or approved equivalent. Standard ground agriculture limestone is defined as ground limestone meeting current requirements of the State Department of Agriculture. Other soil amendments shall meet quality criteria and application requirements specified in Section 7.

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

Straw mulch material—Straw mulch shall consist of wheat, barley, oat or rye straw, hay, grass cut from native grasses, or other plants as specified in Section 7. The mulch material shall be air-

(210-VI-NEH, May 2001) (6-2) dry, reasonably light in color, and shall not be musty, moldy, caked, or otherwise of low quality.

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

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

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

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

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

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

Seedbed preparation shall be discontinued when soil moisture conditions are not suitable for the preparation of a satisfactory seedbed as determined by the contracting officer's technical representative (COTR).

5. Seeding, sprigging, fertilizing, mulching, and stabilizing All seeding or sprigging operations shall be performed in such a manner that the seed or sprigs are applied in the specified quantities uniformly in the designated areas. The method and rate of seed application shall be as specified in Section 7. Unless otherwise specified, seeding or sprigging shall be accomplished within 2 days after final grading is completed and approved.

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

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

(210-VI-NEH, May 2001) (6-3)

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

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

6. Measurement and payment Method 1—For items of work for which specific unit prices are established in the contract, each area treated is measured as specified in Section 7 and the area calculated to the nearest 0.1 acre.

Payment for treatment is made at the contract unit price for the designated treatment, which will constitute full 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.

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

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

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

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

NRCS - Tennessee (6-4) Dyer and Lake Counties Wetland Reserve Program March 9, 2012

7. Items of work and construction details

Bid Items 6, 12, 15, and 18, Seeding, Sprigging, and Mulching.

(1) This item consists of seedbed preparation, and application of seed to establish protective cover on all earthen slopes, all disturbed areas, all earthen ridges, and all earthen mounds that are not actively under construction. The Engineer or his representative will determine the extent of areas for application of protective cover, vegetation.

(2) All seed shall conform to the material requirements contained in the current

Tennessee Seed Law. No “Below Standard” seed will be accepted.

(3) In Section 3, Seeding Mixtures, Sod, Sprigs and Dates of Planting, The following per acre mixture shall be utilized according to the appropriate seeding dates:

(a) From September 1 through November 10, applicable areas shall be seeded with:

Twenty (20) pounds Kentucky 31 Tall Fescue Three (3) bushels Winter Wheat.

Two (2) pounds White Clover(Inoculant Required)

Kentucky 31 Tall Fescue, White Clover (Inoculant Required), and Winter Wheat to be used on bottom and side slopes of breached levee and new constructed levees. Winter wheat to be used on spoil piles.

Any seeding after this date to be determined by engineer or his/her representative.

(4) All seeding methods shall result in an even distribution of seed over the disturbed areas.

(5) In Section 6, Measurement and Payment. Method 1 will apply. Such payment will constitute full compensation for the work as indicated on the drawings.

(210-VI-NEH, May 2001) (8-1)

Construction Specification 8—Mobilization and Demobilization

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.

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

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

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

3. Payment Payment will be made as the work proceeds, after presentation of paid invoices or documentation of direct costs by the contractor showing specific mobilization and demobilization costs and supporting evidence of the charges of suppliers, subcontractors, and others. When the total of such payments is less than the lump sum contract price, the balance remaining will be included in the final contract payment. Payment of the lump sum contract price for mobilization and demobilization will constitute full compensation for completion of the work.

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

NRCS - Tennessee (8-2) Dyer and Lake Counties

4. Items of work and construction details

Bid Items 1, 7, 13, and 16, Mobilization and Demobilization.

(1) This item shall consist of the mobilization and demobilization of the Contractor's forces and equipment necessary to perform the work required under the contract.

(210-VI-NEH, May 2001) (10-1)

Construction Specification 10—Water for Construction

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

2. Facilities and equipment The contractor shall 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.

These facilities shall be equipped with accurate, work dedicated meters; tanks of known volume;

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

3. Dust abatement and haul road maintenance Water for dust abatement and haul road maintenance shall 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 shall 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 shall be as specified in Section 8 of this specification.

4. Earthfill, drainfill, and rockfill Water required for proper installation of earthfill, drainfill, and/or rockfill shall be used in the fill materials as specified in the applicable construction specification(s). Compensation for construction water used for earthfill, drainfill, and/or rockfill shall be as specified in Section 8 of this specification.

5. Concrete, mortar, and grout Water required in the mixing or curing of concrete, shotcrete, roller compacted concrete, or other Portland cement mortar or grout shall meet the requirements of the applicable construction specifications and shall 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.

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

7. Measurement and payment Method 1—For water items for which specific unit prices are established in the contract, the volume of water furnished and used in accordance with the specifications will be measured to the nearest 1,000 gallons.

(210-VI-NEH, May 2001) (10-2)

Payment for water is made at the contract unit price. Such payment will constitute full compensation for the direct costs of water. All other costs necessary for applying water are subsidiary to the items of work they are associated.

Method 2—For water items for which specific unit prices are established in the contract, the volume of water furnished and used in accordance with the specifications will be measured to the nearest 1,000 gallons.

Payment for water and the cost associated with transportation, distribution, and application is made at the contract unit price. Such payment will constitute full compensation for completion of the work.

Method 3—For water items for which specific unit prices are established in the contract, the volume of water used in accordance with the specifications will be measured to the nearest 1,000 gallons.

Payment for water is made at the contract unit price. Such payment, excluding water cost, will constitute full compensation for completion of the work.

All methods—The following provisions apply to all methods of measurement and payment:

• The measurement for payment will include all water used except as noted in Sections 5, 6, and 8 of this specification. Measurement for payment will not include water that is used inappropriately or in excessive to need.

• 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.

NRCS - Tennessee (10-3) Dyer and Lake Counties

8. Items of work and construction details

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

Subsidiary Item, Reinforcement Steel, Concrete.

(1) This item consists of furnishing, transporting, measuring, and applying water as necessary for the earthfill.

(2) In Section 7, Measurement and Payment. No separate payment will be made for Water for Construction. Compensation for Water for Construction will be included in the payment for Bid Item 5, Earthfill, Class C, Pipe Replacement;

Bid Item 9, Earthfill Class C, Pipe Replacement; and Bid Item 18, Earthfill, Ditch Plug.

NRCS - Tennessee (10-4) Dyer and Lake Counties

210-VI-NEH, May 2001) (21-1)

Construction Specification 21—Excavation

The work shall consist of the excavation required by the drawings and specifications and disposal of the excavated materials.

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

Common excavation is defined as the excavation of all materials that can be excavated, transported, and unloaded using heavy ripping equipment and wheel tractor-scrapers with pusher tractors or that can be excavated and dumped into place or loaded onto hauling equipment by excavators having a rated capacity of one 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.

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 shall 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.

For the purpose of these classifications, the following definitions shall apply:

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 10.

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

Pusher tractor is a track type tractor having a power rating of at least 250 flywheel horsepower equipped with appropriate attachments.

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.

3. Blasting The transportation, handling, storage, and use of dynamite and other explosives shall be directed and supervised by a person(s) of proven experience and ability who is authorized and qualified to conduct blasting operations.

Blasting shall be done in a manner as to prevent damage to the work or unnecessary fracturing of the underlying rock materials and shall conform to any special requirements in section 10 of this

210-VI-NEH, May 2001) (21-2) specification. When specified in section 10, the contractor shall furnish the engineer, in writing, a blasting plan before blasting operations begin.

4. Use of excavated material Method 1—To the extent they are needed, all suitable material from the specified excavations shall 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 shall not waste or otherwise dispose of suitable excavated material.

Method 2—Suitable material from the specified excavations may be used in the construction of required earthfill or rockfill. The suitability of material for specific purposes is determined by the engineer.

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

Method 2—All surplus or unsuitable excavated materials are designated as waste and shall be disposed of by the contractor at sites of his own choosing away from the site of the work. The disposal shall be in an environmentally acceptable manner that does not violate local rules and regulations.

6. Excavation limits Excavations shall comply with OSHA Construction Industry Standards (29CFR Part 1926) Subpart P, Excavations, Trenching, and Shoring. All excavations shall be completed and maintained in a safe and stable condition throughout the total construction phase. Structure and trench excavations shall 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 required to meet safety requirements shall be the responsibility of the contractor in constructing and maintaining a safe and stable excavation.

7. Borrow excavation When the quantities of suitable material obtained from specified excavations are insufficient to construct the specified earthfills and earth backfills, additional material shall be obtained from the designated borrow areas. The extent and depth of borrow pits within the limits of the designated borrow areas shall be as specified in section 10 or as approved by the engineer.

Borrow pits shall be excavated and finally dressed to blend with the existing topography and sloped to prevent ponding and to provide drainage.

8. Overexcavation Excavation in rock beyond the specified lines and grades shall be corrected by filling the resulting voids with portland cement concrete made of materials and mix proportions approved by the engineer. Concrete that will be exposed to the atmosphere when construction is completed shall meet the requirements of concrete selected for use under Construction Specification 31, Concrete for Major Structures, or 32, Structure Concrete, as appropriate.

Concrete that will be permanently covered shall contain not less than five bags of cement per

210-VI-NEH, May 2001) (21-3) cubic yard. The concrete shall be placed and cured as specified by the engineer.

Excavation in earth beyond the specified lines and grades shall be corrected by filling the resulting voids with approved, compacted earthfill. The exception to this is that if the earth is to 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 overexcavation condition, the contractor shall review the planned corrective action with the engineer and obtain approval of the corrective measures.

9. Measurement and payment For items of work for which specific unit prices are established in the contract, the volume of each type and class of excavation within the specified pay limits is measured and computed to the nearest cubic yard by the method of average cross-sectional end areas or by methods outlined in section 10 of this specification. Regardless of quantities excavated, the measurement for payment is made to the specified pay limits except that excavation outside the specified lines and grades directed by the engineer to remove unsuitable material is included. Excavation required because unsuitable conditions result from the contractor's improper construction operations, as determined by the engineer, is not included for measurement and payment.

Method 1—The pay limits shall be as designated on the drawings.

Method 2—The pay limits shall be defined as follows:

a. The upper limit shall be the original ground surface as it existed before the start of construction operations except that where excavation is performed within areas designated for previous excavation or earthfill, the upper limit shall be the modified ground surface resulting from the specified previous excavation or earthfill.

b. The lower and lateral limits shall be the neat lines and grades shown on the drawings.

Method 3—The pay limits shall be defined as follows:

a. The upper limit shall be the original ground surface as it existed before the start of construction operations except that where excavation is performed within areas designated for previous excavation or earthfill, the upper limit shall be the modified ground surface resulting from the specified previous excavation or earthfill.

b. The lower and lateral limits shall be the true surface of the completed excavation as directed by the engineer.

Method 4—The pay limits shall be defined as follows:

a. The upper limit shall be the original ground surface as it existed before the start of construction operations except that where excavation is performed within areas designated for previous excavation or earthfill, the upper limit shall be the modified ground surface resulting from the specified previous excavation or earthfill.

b. The lower limit shall be at the bottom surface of the proposed structure.

c. The lateral limits shall be 18 inches outside of the outside surface of the proposed structure or shall be vertical planes 18 inches outside of and parallel to the footings, whichever gives the larger pay quantity, except as provided in d below.

d. For trapezoidal channel linings or similar structures that are to be supported upon the sides of the excavation without intervening forms, the lateral limits shall be at the underside of the proposed lining or structure.

210-VI-NEH, May 2001) (21-4)

e. For the purposes of the definitions in b, c, and d, above, any specified bedding or drainfill directly beneath or beside the structure will be considered to be a part of the structure.

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

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 all other items necessary and incidental to the performance of the work except that extra payment for backfilling overexcavation will be made in accordance with the following provisions.

Payment for backfilling overexcavation, as specified in section 8 of this specification, is made only if the excavation outside specified lines and grades is directed by the engineer to remove unsuitable material and if the unsuitable condition is not a result of the contractor's improper construction operations as determined by the engineer.

Compensation for any item of work described in the contract, but not listed in the bid schedule is items to which they are made subsidiary are identified in section 10 of this specification.

NRCS - Tennessee (21-5) Dyer and Lake Counties

10. Items of Work and Construction Details are:

(a)

(1) This item consists of the excavation required to construct the shallow excavation as indicated on the drawings, or otherwise staked in the field. This item also consists of hauling, placement, and disposal of all excess and waste excavated materials as indicated on the drawings.

Bid Item 17, Excavation, Common Shallow Water

(2) All areas disturbed shall be left in a reasonably smooth manner. Areas outside of the excavation area shall be left smooth enough to allow for mechanical planting of trees in the winter.

(3) In Section 3, Blasting, Blasting will not be allowed.

(4) In Section 4, Use of Excavated Material, Method 2 will apply.

(5) In Section 5, Disposal of Waste Materials, Method 1 will apply. All excavated materials shall be placed in areas designated on the drawings or otherwise designated by the Engineer. The spoil materials shall be placed in low mounds not to exceed three (3) feet above natural ground.

(6) The placement of spoil is not need to meet any compaction requirements or control of moisture. The contractor should leave spoil areas with side slopes as indicated in the drawings. The cost of placing spoil materials is Subsidiary to Bid Item 15 and 21, Shallow Excavation, Common.

(7) The shallow water areas shall meet the lines and grades on the drawings, or otherwise staked in the field. There shall be no excavations deeper than 3 feet from existing ground elevation. The finished grades along the bottom shall be within +/- 0.3 feet. The bottom and side slopes do NOT need to be left in a really smooth condition. Normal marks left behind by dozers and dirt pans will be tolerated.

(8) In Section 9, Measurement and Payment. Method 2 will apply. Such payment will constitute full compensation for the work as indicated on the drawings.

(b)

(1) This item consists of the excavation required for pipe replacement in existing levees for the restoration of wetland hydrology. Trees are to be cleared and grubbed over area where pipe replacement will occur. Tree and stumps are to be piled up and burned on site. After trees and stumps are burned, burned material is to be buried and a minimum of 2 feet soil material is to be placed over burned material. Material is to be excavated and placed in piles to be used as earthfill material. Levees shall be built back to elevations indicated on the drawings, or otherwise staked by Engineer or his/her

Bid Items 3 and 8, Excavation, Common, Pipe Replacement

NRCS - Tennessee (21-6) Dyer and Lake Counties representative. This item also consists of hauling, placement, and disposal of all excess and waste excavated materials as indicated on the drawings.

(2) All areas disturbed shall be left in a reasonably smooth manner. Areas outside of the excavation area shall be left smooth enough to allow for mechanical planting of trees in the winter.

(3) In Section 3, Blasting, Blasting will not be allowed.

(4) In Section 4, Use of Excavated Material, Method 2 will apply.

(5) In Section 5, Disposal of Waste Materials, Method 1 will apply. All excavated materials shall be placed in areas designated on the drawings or otherwise designated by the Engineer or by his/her representative. The spoil materials shall be placed in low mounds not to exceed three (3) feet.

(6) The placement of spoil is not need to meet any compaction requirements or control of moisture. The contractor should leave spoil areas with side slopes as indicated in the drawings. The cost of placing spoil materials is Subsidiary to Bid Item 3 and 8, Excavation, Common, Pipe Replacement.

(7) In Section 9, Measurement and Payment. Method 2 will apply. Such payment will constitute full compensation for the work as indicated on the drawings and for related Subsidiary Item, Clearing and Grubbing.

NRCS - Tennessee (21-7) Dyer and Lake Counties

(210-VI-NEH, May 2001) (23-1)

Construction Specification 23—Earthfill

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

Earthfill is composed of natural earth materials that can be placed and compacted by construction equipment operated in a conventional manner.

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.

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

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

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

3. Foundation preparation Foundations for earthfill shall be stripped to remove vegetation and other unsuitable material or shall be excavated as specified.

Except as otherwise specified, earth foundation surfaces shall be graded to remove surface irregularities and shall 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 shall be controlled as specified for the earthfill, and the surface material of the foundation shall be compacted and bonded with the first layer of earthfill as specified for subsequent layers of earthfill.

Earth abutment surfaces shall be free of loose, uncompacted earth in excess of 2 inches in depth normal to the slope and shall 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.

Rock foundation and abutment surfaces shall be cleared of all loose material by hand or other effective means and shall 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, shall 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.

(210-VI-NEH, May 2001) (23-2)

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

4. Placement Earthfill shall not be placed until the required excavation and foundation preparation have been completed and the foundation has been inspected and approved by the engineer. Earthfill shall not be placed upon a frozen surface nor shall snow, ice, or frozen material be incorporated in the earthfill matrix.

Earthfill shall be placed in approximately horizontal layers. The thickness of each layer before compaction shall not exceed the maximum thickness specified in Section 10 or shown on the drawings. Materials placed by dumping in piles or windrows shall be spread uniformly to not more than the specified thickness before being compacted.

Hand compacted earth backfill shall be placed in layers whose thickness before compaction does not exceed the maximum thickness specified for…