McDowell_EWP_Specs_5_8_13.pdf

NRCS- 03/13

McDowell County WV- EWP Structure Removal

Statement of Work

WV EWP Structure Removal Demolition and Restoration

McDowell County, WV

The work to be accomplished under this contract consists of the demolition of five (5) residential properties located in McDowell County in southern West Virginia in and around the town of Welch. The structures are to be removed in their entirety, stream bank protection is to be installed and the disturbed areas are to be graded and seeded to provide positive drainage and vegetative cover.

Work shall consist of placing 840 tons of 9 to 28 inches rock riprap, and 85 cubic yards of gabion baskets. The quantity for general demolition removal is estimated to be 300 tons. No measurement will be made for site grading and seeding or for mobilization and demobilization.

These items will be paid as lump sum.

NRCS- 03/13

Construction and Material Specification List

WV EWP Structural Removal McDowell County, WV

No.

Date

1/09

Title

CONSTRUCTION SPECIFICATIONS

Pollution Control 6 5/01 Seeding, Sprigging, and Mulching 8 5/01 Mobilization & Demobilization 11 5/01 Removal of Water 61 1/09 Rock Riprap 64 1/09 Gabions and Gabion Mattresses

95 5/01 Geotextile 400 7/11 Site Demolition

MATERIAL SPECIFICATIONS

11/05

Rock for Riprap

592 5/01 Geotextile

Chapter 2 National Standard Construction Specifications Part 642 National Engineering Handbook

Construction Specification 5—Pollution Control

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.

2. Material All 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 sediment fences trap sediment from areas of limited runoff. Sediment filters shall be properly anchored to prevent erosion under or around them. 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.

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 section 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 completion of construction activities, facilities shall be disposed of without causing pollution as specified in section 8 of this specification.

(210-VI-NEH, January 2009) 5–1

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 specification, 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 compensation 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 prorating 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.

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.

(210-VI-NEH, January 5-2

NRCS- 05/13

McDowell County WV- EWP Structure Removal 5-3

8. Items of work and construction details

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

a. Subsidiary Item, Pollution Control

(1) The contractor shall exercise precaution throughout the duration of the Contract to prevent the pollution of rivers and streams. Chemicals, fuels, lubricants, raw sewage, and other harmful wastes shall not be discharged into or alongside any river, stream, or natural or man-made waterway leading thereto. Materials identified as chemical pollutants in Section 4 of this Specification shall be removed from the site and disposed of in compliance with applicable state and federal regulations. Any chemical pollutant spills shall be reported to the State Center for Pollution, Toxic Chemical and Oil Spills hotline at 1-(800)-642-3074.

(2) This item shall consist of furnishing, installing, maintaining, and removing silt fence as approved by the engineer. The silt fence shall be commercial grade and installed per manufacturer’s recommendations.

(3) Silt fence shall be installed as required to achieve the intent of these specifications.

(4) The contractor shall prepare and maintain on site a Groundwater Protection Plan that complies with West Virginia’s Division of Environmental Protection Legislative Rule, Title 47, Series 58, Groundwater Protection Rule.

(5) The contractor shall schedule clearing and grubbing operations in a manner which will minimize the amount of erodible surface soil exposed at any time. Areas shall not be cleared and grubbed until immediately prior to actual need or use of the area.

(6) Pollution control measures shall be installed in a timely manner to protect against erosion from areas to be exposed by excavation and fill operations.

(7) Equipment shall not be operated in live streams except as may be required to construct stream bank stabilization measures and temporary structures located in live streams.

Frequent fording of live streams with construction equipment will not be permitted.

Temporary bridges, culverts, or other structures shall be installed wherever an appreciable number of stream crossings are necessary.

(8) Protective cover shall be applied to disturbed areas as soon as work has been completed in the area, and/or whenever work in the disturbed area will be delayed or stopped more than five (5) continuous days. Areas to be provided with protective cover will be staked and/or flagged in the field by the engineer. Protective cover shall be applied to disturbed areas by mulching with straw. Materials and workmanship for providing protective cover shall be in accordance with Construction Specification 6, Seeding, Sprigging and Mulching. Straw mulch shall be applied uniformly to disturbed areas at the rate of 2 tons per acre.

(9) No separate payment will be made for Pollution Control. Compensation for this item will be made under Bid Item 2, Rock Riprap, Construction Specification 61; Bid Item 3, Gabion Baskets, Construction Specification 64; Bid Item 4, General Demolition Removal;

and Bid Item 5, Construction Rubble Disposal and Site Grading. Const. Specification 400.

(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.

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.

(210-VI-NEH, May 2001) 6-2

Mulch tackifiers—Asphalt emulsion tackifiers shall conform to the requirements of ASTM D 977, Specification for Emulsified Asphalt. The emulsified asphalt may be rapid setting, medium setting, or slow setting.

Nonasphaltic tackifiers required because of environmental considerations shall be as 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-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).

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

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.

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.

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

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.

McDowell County WV- EWP Structure Removal 6-5

7. Items of Work and Construction Details

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

a. Subsidiary Item, Seeding and Mulching

(1) This item shall consist of seeding and mulching to permanent cover all disturbed areas within the limits of the demolition sites.

(2) No permanent seeding shall be done between October 1 and December 1 unless otherwise approved by the Contracting Officer.

(3) The approved lines and grades for permanent seeding at the time of permanent seeding shall be maintained during and after the seeding and mulching operation. Any area that has been damaged or had part or all of the seeding material removed by any means shall be repaired before acceptance will be made. The area to be repaired shall be filled and/or graded as needed to bring it back to neat lines, fertilized, seedbed prepared, and then seeded and mulched at the specified rates.

(4) Lime shall be applied at an application rate of 2 tons per acre.

(5) The following minimum amounts of fertilizer shall be applied per acre prior to seeding:

(a) Nitrogen (N) 40 lb

Phosphoric Acid (P2O5) 80 lb Potash (K2O) 80 lb

(b) The required application can be achieved by applying fertilizer having an analysis of 10-

20-20 at the rate of 400 pounds per acre or 9 pounds per 1000 square feet.

(6) Seedbed Preparation.

(a) Lime and fertilizer shall be applied prior to final seedbed preparation.

(b) Seeding shall be accomplished immediately after achieving final grade. Seedbed preparation shall only be required on compacted, polished, or freshly cut soil surfaces. Where special seedbed preparation is required, the hardened soil shall be loosened to a depth of 1½ inches; either by equipment or manual methods.

(7) Seed.

(a) Each seed species shall comply with the West Virginia Department of Agriculture’s standards for purity and germination. The seed mixtures and application rates are:

Seed Rate,lb/ac.

Bluegrass 8 Kentucky 31 Tall Fescue 10 Annual Ryegrass 15 Red Fescue 5 Perennial Ryegrass 5

McDowell County WV- EWP Structure Removal 6-6

(b) When seeding is performed between April 15-August 1 or December 1-March 1, the specified rates of seed per acre shall be increased by 50 percent.

(8) Mulch material shall be wheat, oat or rye straw only. Mulch shall be applied uniformly over all seeded areas at the specified rate per acre. Application shall be within 24 hours after seeding. A mechanical blower may be used to apply the mulch. Application rates and material requirements shall be in accordance with the following table:

Time Period vs. Mulching Requirements for

Revegetation of Construction Sites

Time Period

Application tons/acre

March 1 – April 15 August 1 – October 1

April 15 – August 1

2.5

October 1 – December 1

2.0

December 1 – March 1

2.5

(9) No separate payment will be made for Seeding and Mulching. Compensation for this item will be made under Bid Item 5, Construction Rubble Disposal and Site Grading, Construction Specification 400.

(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.

McDowell County WV- EWP Structure Removal 8-2

4. Items of Work and Construction Details

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

a. Bid Item 1, Mobilization and Demobilization

(1) This item shall consist of the mobilization and demobilization of all work forces, materials, and equipment necessary to complete the work at all sites under this contract.

(2) The contractor shall contact MISS Utility before work on each site begins. The contractor shall provide the MISS Utility conformation number for the site to the engineer before commencement of the work.

(3) Prior to construction the contractor shall verify that all utilities have been disconnected at each site.

(4) The Contractor may use a portable sign for public notice and for posting documents as required by the permits and this contract. Signage may be prepared to accommodate frequent revisions for use at multiple demolition sites.

(5) The contractor is responsible for preparing and obtaining a Groundwater Protection Plan

(GPP) that complies with the West Virginia’s Division of Environmental Protection Legislative Rule, Title 47, Series 58, Groundwater Protection Rule.

(210-VI-NEH, May 2001 11-1

Construction Specification 11—Removal of Water

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

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

The contractor shall furnish the contracting officer, in writing, a proposed plan for diverting surface water before beginning any construction activities for which a diversion is required, unless waived in section 8 of this specification. Acceptance of this plan or the waiving of the plan requirement will not relieve the contractor of the responsibilities related to this activity during the process of completing the work as specified.

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

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

The contractor shall furnish the contracting officer, in writing, a proposed plan for dewatering before commencing with any construction activity for which dewatering may be required, unless waived in section 8 of this specification. Acceptance of this plan or the waiving of the plan requirement will not relieve the contractor of the responsibilities for completing the specified work.

4. Dewatering borrow areas The contractor shall maintain all borrow areas free of surface water or otherwise provide for timely and effective removal of surface and subsurface water that accumulates within the borrow area, unless waived in section 8 of this specification. Borrow material shall be processed as necessary to achieve proper and uniform moisture content at the time of placement.

If pumping to dewater borrow areas is included as a bid item of work in the bid schedule, each pump discharge pipe shall be equipped with a water meter. The meter shall be such that the measured quantity of water is accurate within 3 percent of the true quantity. The contractor shall

(210-VI-NEH, May 2001)

11-2 provide necessary support to perform accuracy tests of the water meter when requested by the contracting officer.

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

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

6. Removal of temporary works When temporary works are no longer needed, the contractor shall remove and return the area to a condition similar to that which existed before construction. Areas where temporary works were located shall be graded for sightly appearance with no obstruction to natural surface waterflows or the proper functioning and access to the works of improvement installed. The contractor shall exercise extreme care during the removal stages to minimize the loss of soil sediment and debris that was trapped during construction.

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

Method 1—Items of work listed in the bid schedule for removal of water, diverting surface water, and dewatering construction sites and borrow areas are paid for at the contract lump sum prices. Such payment will constitute full compensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.

Method 2—Items of work listed in the bid schedule for removal of water, diverting surface water, dewatering construction sites, and dewatering borrow areas are paid for at the contract lump sum prices. Such payment will constitute full compensation for furnishing, installing, operating, and maintaining the necessary trenches, drains, sumps, pumps, and piping and for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work. The exception is that additional payment for pumping to dewater borrow areas and the removal of water will be made as described in the following paragraph.

If pumping to dewater borrow areas is a contract bid item, payment is made at the contract unit price, which shall be the price per 1,000 gallons shown in the bid schedule. Such payment will constitute full compensation for pumping only. Compensation for equipment and preparation and for other costs associated with pumping is included in the lump sum payment for removal of water or the lump sum payment for dewatering the borrow areas. Payment is made only for pumping that is necessary to dewater borrow areas that cannot be effectively drained by gravity or that must have the water table lowered to be usable as a suitable borrow source. Pumping for other purposes will not be included for payment under this item.

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

Compensation for any item of work described in the contract, but not listed in the bid schedule is included in the payment for the contract line item to which it is made subsidiary. Such items andthe items to which they are made subsidiary are identified in section 8 of this specification.

McDowell County WV- EWP Structure Removal 11-3

Items of work to be performed according to this specification and the construction details are:

a. Subsidiary Item, Removal of Water

(1) This item shall consist of all work necessary to divert surface waters and dewater the work areas as required to perform the work.

(2) Submittal of written plans for diverting surface water and dewatering the site are not required.

(3) No separate payment will be made for Removal of Water. Compensation for this item will be included in the payment for Bid Item 2, Rock Riprap, Construction Specification 61;

Bid Item 3, Gabion Baskets, Construction Specifications 64; Bid Item 4, Construction Debris Disposal, and Bid Item 5, Construction Rubble Disposal and Site Grading, Construction Specification 400.

Construction Specification 61—Rock Riprap

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

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

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

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

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

Sieve size of rock

Approx. weight of rock

Weight of test pile

16 inches 300 pounds 6,000 pounds

11 inches 100 pounds 2,000 pounds

6 inches 15 pounds 300 pounds

When specified in Section 8 or when it is necessary to verify the gradation of the rock riprap, a particle size analysis shall be performed in accordance with ASTM D5519, Test Method A or B. The analysis shall be performed at the work site on a test pile of representative rock. The mass of the test pile shall be at least 20 times the mass of the largest rock in the pile.

The results of the test shall be compared to the gradation required for the project. Test pile results that do not meet the construction specifications shall be cause for the rock to be rejected. The test pile that meets contract requirements shall be left on the job site as a sample for visual comparison. The test pile shall be used as part of the last rock riprap to be placed.

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

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

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

(210-VI-NEH, January 2009) 61–1

4. Equipment-placed rock riprap The rock riprap shall be placed by equipment on the surface and to the depth specified. It shall be installed to the full course thickness in one operation and in such a manner as to avoid serious displacement of the underlying material. The rock for riprap shall be delivered and placed in a manner that ensures the riprap in place is reasonably homogeneous with the larger rocks uniformly distributed and firmly in contact one to another with the smaller rocks and spalls filling the voids between the larger rocks. Some hand placing may be required to provide a neat and uniform surface.

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

5. Hand placed rock riprap The rock riprap shall be placed by hand on the surface and to the depth specified. It shall be securely bedded with the larger rocks firmly in contact one to another without bridging. Spaces between the larger rocks shall be filled with smaller rocks and spalls.

Smaller rocks shall not be grouped as a substitute for larger rock. Flat slab rock shall be laid on its vertical edge except where it is laid like paving stone and the thickness of the rock equals the specified depth of the riprap course.

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

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

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

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

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

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

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

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

(210-VI-NEH, January 2009) 61-2

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

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

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

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

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

All methods—The following provision applies to all methods of measurement and payment. Compensation for any item of work described in the contract, but not listed in the bid schedule, is included in the payment for the item of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in section 8.

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

(210-VI-NEH, January 2009) 61–3

McDowell County WV- EWP Structure Removal 61-4

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

a. Bid Item 2 , Rock Riprap,

(1) This item shall consist of furnishing and installing rock riprap for the protection of the stream bank slope as shown on the drawings at the England, Evans, and Roberts sites.

(2) In Section 2, Material, Rock shall meet the requirements of Rock Type 1, Material Specification 523, or be from sources with current approval from the West Virginia Department of Transportation. The contractor shall provide a gradation test as specified with the material certification prior to delivery of riprap to the site.

(3) Change the statement in Section 2 that begins with "At least 30 days prior to delivery…" to read "At least 7 days prior to delivery…".

(4) Rock riprap shall be equipment placed.

(5) Rock riprap shall be well-graded between the nominal sizes of 9 and 28 inches. Well-graded shall mean that a broad range of rock particle sizes are represented and that substantial amounts of each rock particle size are included.

Not more than 15 percent of the rock particles by weight shall be smaller than 9 inches. Not more than 50 percent of the rock particles by weight shall be smaller than 18 inches. One hundred percent of the rock particles shall be smaller than 28 inches.

(6) Rock riprap shall be shaped to blend with existing ground at all ends of the work.

The riprap shall be tied in to existing natural features where possible, as determined by the Engineer. Riprap shall be keyed into the bank at the upstream and downstream ends of the riprap blanket as shown on the drawings. The key shall have a depth and a width equal to twice the thickness of the riprap blanket. The key side slopes shall be 1:1, and extend up the slope from the toe of the riprap blanket to the top of the riprap blanket.

(7) In Section 7, Measurement and payment, method 5 will apply.

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

(a) Pollution Control, Construction Specification 5,

(b) Removal of Water, Construction Specification 11,

(c) Geotextile, Construction Specification 95.

Construction Specification 64—Gabions and Gabion Mattresses

The work consists of furnishing, assembling, and installing rock filled wire mesh gabions and gabion mattresses. Gabions are at least 12 inches high. Gabion mattresses are no more than 12 inches high.

Gabions and gabion mattresses shall consist of rectangular wire mesh formed containers filled with rock. The wire coating shall be as specified in section 7.

Twisted-mesh—Nonraveling, double twisted, hexagonal wire mesh consisting of two wires twisted together in two 180-degree turns.

Twisted-mesh, fasteners, and stiffeners shall conform to the requirements of ASTM A975.

Welded-mesh—Welded mesh with a uniform square or rectangular pattern and a resistance weld at each intersection. Welded-mesh and stiffeners shall conform to the requirements of ASTM A974 with the exception that welded-mesh may be delivered in component form, either rolled or stacked, for assembly at the job site.

Spiral binders are the standard fastener for welded-mesh gabions and gabion mattresses. Spiral binders shall conform to the requirements of ASTM A974. Alternate fasteners for use with welded-mesh gabions and gabion mattresses, such as ring fasteners or lacing wire, shall be formed from wire meeting the same quality and coating thickness requirements as specified for the gabions and gabion mattresses. Ring fasteners shall be made of stainless steel. Standard fasteners and alternate fasteners must provide the minimum strength per lineal foot that is specified in ASTM A974 for gabions and gabion mattresses.

Rock—Rock shall conform to the quality requirements in Material Specification 523, Rock for Riprap, unless otherwise specified in Section 7. At least 85 percent of the rock particles, by weight, shall be within the predominant rock size range.

Gabion basket or mattress height

Predominant rock size (in)

Minimum rock dimension (in)

Maximum rock dimension (in)

12-, 18-, or 36-inch basket 4 to 8 4 8

6-, 9-, or 12-inch mattress 3 to 6 3 6

At least 30 days before delivery to the site, the contractor shall submit in writing the source from which the rock will be obtained, test data, and other information needed to document that the rock meets the requirements of this specification. The contractor shall provide the engineer free access to the source for the purpose of obtaining samples for testing.

Bedding or filter material—Bedding or filter material, when specified, shall meet the gradation shown on the plans, or as specified in section 7, and the requirements of Material Specification 521, Aggregates for Drainfill and Filters. Geotextile, when specified, shall conform to the requirements specified in section 7 and those of Material Specification 592, Geotextile.

3. Foundation preparation

The foundation on which the gabions and gabion mattresses are to be placed shall be cut or filled and graded to the lines and grades shown on the drawings. Surface irregularities, loose material, vegetation, and all foreign matter shall be removed from the foundation.

When fill is required, it shall consist of material conforming to the requirements specified in Section 7. Fill shall be compacted as specified in Section 7. Gabions, gabion mattresses, and bedding or geotextiles shall not be placed until the foundation meets the requirements of this specification.

(210-VI-NEH, January 2009) 64–1

Compaction of bedding or filter material is required as specified in section 7. The surface of the finished material shall be to grade and free of mounds, dips, or windrows. Geotextile shall be installed in accordance with the requirements of Construction Specification 95.

4. Assembly and placement

Where a gabion or gabion mattress unit must be modified, welded-mesh panels may be cut to fit. Twisted-mesh panels may be folded and neatly wired but shall not be cut.

Assembly—Use lacing wire for the assembly and placement of twisted-mesh panels. Wrap the lacing wire with alternating single and double half-hitches at 4- to 6-inch intervals and secure by tying a double half hitch at each end. Use spiral or ring type fasteners for the assembly and placement of welded-mesh panels. Where spiral fasteners are used, crimp the ends to secure the spirals in place. Where ring type fasteners are used, install the fasteners at a maximum spacing of 6 inches.

Interior diaphragms are required where any dimension exceeds 3 feet. Use the same type fasteners and fastening procedures to install interior diaphragms and lids as used in the panel assembly.

Placement—Place the gabions or gabion…