Wet Walnut 53 construction specifications.pdf

KS-NRCS NEH 642 - 5/01 3-1

Construction Specification 3—Structure Removal

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

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

3. Removal All structures designated for removal in the contract shall be removed to the specified extent and depth.

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

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

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

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

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

Compensation for any item of work described in the contract, but not listed as a contract line item number in the bid schedule, is included in the payment for the item of work to which it is made subsidiary. Such items and items to which they are made subsidiary are identified in section 7 of this specification.

NRCS - November 13, 2009 3-2 KS – Wet Walnut Creek Watershed, FRD No. 53

7. Items of work and construction details

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

a. Subsidiary Item - Structure Removal

(1) This item consists of removing the fences in the construction area as shown on the drawings, or as approved by the engineer.

(2) The extent of fence removal shall be the minimum amount necessary to accomplish the other required work items. Removal shall also be accomplished in a manner that minimizes the adverse effect on remaining fence.

(3) Existing steel line posts from the fence materials removed may be salvaged and re-used in the new fence if they are not bent or otherwise damaged during removal.

(4) Where practical, wood posts shall be preserved from damage and removal.

(5) Refuse material shall be disposed of in the approved local county landfill.

(6) No separate payment will be made for Structure Removal. Compensation for

Structure Removal will be included in the payment for Special Area Fences (Barbed Wire).

KS-NRCS NEH 642 - 5/01 5-1

Construction Specification 5—Pollution Control

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.

KS-NRCS NEH 642 - 5/01 5-2

4. Chemical pollution The contractor shall provide watertight tanks or barrels or construct a sump sealed with plastic sheets to dispose of 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. At the completion of the construction work, 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.

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 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.

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.

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8. Items of work and construction details

a. Bid Item 1 - Pollution Control Measures

(1) This item shall consist of providing a sanitary toilet facility for the job site, the collection and disposal of chemical pollutants, and the installation and maintenance of structural measures required for control of sediment pollution including silt fence barriers and straw bale barriers.

(2) Chemical Pollution Control

(a) All waste and/or used oils and grease shall be caught in containers suitable for the storage and transportation of such pollutants. All materials shall be transported to a commercial chemical disposal facility capable of either recycling or disposing of the pollutants. The manifest(s) for all chemical pollutants and other materials removed from the site shall be, upon request, made available to the Contracting Officer or the Contracting Officer's Representative. The manifest(s) shall include the date of transport, destination, description of materials transported, name of the recipient recycling facility or recipient disposal facility.

Soil materials contaminated by chemical pollutants shall be disposed of with the pollutant materials. With prior approval from the engineer and after consultation with the Kansas Department of Health and Environment, contaminated soil materials may instead be buried in the designated downstream waste area(s), spread out to no more than 6 inches deep, disked to mix into soil, and covered with not less than 12 inches of topsoil.

(b) At the completion of construction, all sanitary facilities shall be removed from the site. Any materials contaminated by the sanitary facilities, their installation, operation, or removal shall immediately be removed and disposed of in accordance with all federal, state, and local regulations.

(c) An earthen dike will be constructed and maintained around all fuel storage tanks.

The height of the dike will be as needed to contain the stored fuel without overtopping.

(d) All areas disturbed by pollution cleanup operations shall be restored to as nearly original conditions as practicable.

(3) Structural Sediment Barriers

(a) Structural sediment control measures shall be in place prior to beginning operations when practical. Temporary earthen dikes may be installed at the end of the workday in locations where no other measures exist.

(b) Silt fence barriers or straw bale barriers shall be installed where sediment barriers are indicated on the drawings. The Engineer may identify additional locations requiring these control measures during the course of construction. All materials

NRCS - November 13, 2009 5-4 used for constructing silt fence barriers and straw bale barriers shall be approved by the Engineer prior to installation.

(c) All structural sediment control measures shall be maintained until no longer needed. Such maintenance shall include clean out of accumulated sediment and debris, repair or replacement of embankments or outlet pipes, and maintenance of vegetation or mulch. Sediment shall be removed from barriers when accumulated sediment depth exceeds one-third of the fence height.

(d) Sediment and debris removed from the structures shall be buried or placed in the designated waste areas in accordance with Item 10e, Disposal of Waste Material, in Construction Specification 21 - Excavation.

(e) All structural sediment pollution control measures shall be removed at the completion of the phase of work for which they are used. Such removal shall be at the approval of the Engineer.

(4) Measurement and payment will be as specified in Section 7.

KS-NRCS NEH 642 - 5/01 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. 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

KS-NRCS NEH 642 - 5/01 6-2

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).

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

KS-NRCS NEH 642 - 5/01 6-3

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 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.

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 - November 13, 2009 6-4

7. Items of work and construction details

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

Bid Item 2 - Seeding and Mulching

(1) This item consists of preparing the seedbed and placing seed and mulch to the approximate limits of the areas shown on the drawings. Measurement and payment will be as specified in section 6.

(2) The seeding operation shall be done within 7 days after final grading is completed and may be done in any month of the year except October.

(3) All equipment used on the slopes shall operate on or near the level contour of the slopes.

If necessary, a cable or some other means shall be used to prevent rutting of slopes during all seeding and mulching operations.

(4) Weeds shall be removed from the seeding area if they will interfere with any operation in the seeding process.

(5) All accessible areas shall be sown with a grass drill. The seed shall be placed 1/4 to 3/4 inch deep. The drill shall be equipped with coulter openers and depth bands spaced not more than 12 inches apart. All areas seeded with a drill shall be packed with a corrugated roller or similar equipment unless the drill is equipped with packer wheels.

Small, inaccessible areas or wet areas may be broadcast seeded. Broadcast areas shall be lightly harrowed or raked the same day the seed is spread.

(6) Mulch materials shall consist of good quality prairie (native) hay. For this site, there are

6.1 acres that will require 2 tons per acre of prairie hay. If mulch is applied on or after July 15, current year hay cutting shall be used. If mulch is applied before July 15, hay shall be no older than the previous year’s cutting. All mulch hay shall be visually inspected and approved by the inspector prior to application. The mulch shall be applied at a rate of 2 tons per acre. The mulch shall be anchored by using a straight, serrated disc weighted to press the mulch into the soil a minimum of 2 inches. Spacing between discs shall not exceed 12 inches. No area shall be mulched that cannot be anchored in the same day's operation. Weight tickets on each load of mulch shall be delivered to the inspector prior to the application. All areas seeded shall be mulched.

(7) Seed mixtures will vary for different sections of the disturbed area. The approximate area where each seeding mixture is used is shown on the drawings. Mixture #2 will be applied to the upstream vegetated wave berm only. Mixture #1 will be applied to all other disturbed areas. Seed mixtures shall be as follows:

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Mixture #1

Pounds per Acre Species in "Pure Live Seed" (PLS)

Achenbach smooth brome, Bromus inermis 1.6 Lovington blue grama, Bouteloua gracilis 0.3 El Reno sideoats grama, Bouteloua curtipendula 3.0 Barton western wheatgrass, Agropyron smithii 4.0 Blackwell switchgrass, Panicum virgatum 1.2 Texoka or Improved buffalograss, Buchloe dactyloides 1.5

Total Rate (PLS LBS.) 11.6

Mixture #2 (Vegetated Wave Berm)

Pounds per Acre Species in "Pure Live Seed" (PLS)

Kanlow switchgrass, Panicum virgatum 1.8 Blackwell switchgrass, Panicum virgatum 0.6 Texoka or Improved buffalograss, Buchloe dactyloides 1.5 El Reno sideoats grama, Bouteloua curpendula 1.2 Barton western wheatgrass, Agropyron smithi 6.0 Cheyenne indian grass, Sorghastrum nutans 0.6

Total Rate (PLS LBS.) 11.7

KS-NRCS NEH 642 - 5/01 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.

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4. Items of work and construction details

Bid Item 3 - Mobilization and Demobilization

(1) This item consists of mobilization and demobilization of the contractor's forces and equipment necessary for the completion of the work.

(2) Transportation of any materials incorporated into the permanent works shall not be considered a mobilization item.

(3) The contractor will ensure that the Contracting Officer has notified the Kansas Division of Water Resources prior to starting any work on the site.

KS-NRCS NEH 642 - 5/01 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 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.

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8. Items of work and construction details

Subsidiary Item - Water

(1) This item consists of watering the various fill materials and haul roads necessary for the construction of the earthfill items.

(2) The source and water rights for the quantity of water needed shall be the responsibility of the contractor.

(3) Water shall be added to the foundation or fill materials as required to meet the moisture requirements shown in the specifications for earthfill. The amount of water added shall provide a moisture content in the foundation or fill materials that is within the required range plus a reasonable amount to compensate for evaporation and other unavoidable losses.

(4) Borrow operations shall not start until any applied water has been absorbed uniformly by the soil. The length of absorption time shall be dependant on the amount of water applied but not less than 12 hours after the application has ceased.

The surfaces of the borrow area shall be maintained in a manner that shall prevent undue loss of moisture.

(5) Sources of earthfill materials which contain excessive moisture because of the addition of water under this specification shall not be abandoned in favor of other materials. Steps shall be taken by the contractor to reduce the moisture content of such materials.

(6) Water or other methods shall be used for dust abatement on the construction site to maintain proper visibility. Water used on haul roads for maintenance or dust control shall be properly applied to prevent slippery, muddy, or other hazardous conditions.

(7) No separate payment will be made for Water. Compensation for Water will be included in the payment for Earthfill, Wave Protection Berm; and Earthfill, Downstream Berm.

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

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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.

7. Measurement and payment 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 and the items to which they are made subsidiary are identified in section 8 of this specification.

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8. Items of work and construction details

Subsidiary Item - Removal of Water

(1) This item consists of the removal of water from the work site during construction.

(2) The contractor shall cooperate with the Wet Walnut Creek Watershed District to maintain the reservoir level sufficiently below the work area on the front slope of the dam during the contract period, to allow access to borrow and to complete the work on the front slope.

(3) Surface and ground water that has accumulated in the toe drain construction area shall be effectively removed in a timely manner as needed to provide good trafficability and to facilitate installation of drainfill and pipe.

(4) The dewatering plan shall be approved by the engineer prior to the start of any work.

(5) No separate payment will be made for Removal of Water. Compensation for

Removal of Water will be included in the payment for Earthfill, Wave Protection Slope; Earthfill, Downstream Berm; and Drainfill.

KS-NRCS NEH 642 - 5/01 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

KS-NRCS NEH 642 - 5/01 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 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.

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

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 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.

KS-NRCS NEH 642 - 5/01 21-3

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.

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.

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.

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10. Items of work and construction details All excavations shall be constructed to the lines and grades shown on the drawings or as directed by the engineer.

The use of excavated material shall be as specified in Section 4.

therefor are:

a. Subsidiary Item - Excavation, Borrow, Common

(1) This item shall consist of all common excavation required from the borrow areas for obtaining fill materials needed for construction of the permanent fill.

(2) The location of the borrow areas shall be as shown on the drawings, or as approved by the engineer. All borrow shall be excavated below elevation 2251.7

(3) All excavated slopes shall be 2:1 or flatter.

(4) All haul roads shall be constructed to accommodate the required hauling equipment.

When the need for two-way traffic exists, a safe passing width shall be provided. All haul roads shall be continuously maintained dust-free and graded to eliminate unsafe traveling conditions.

(5) No separate payment will be made for Excavation, Borrow, Common. Compensation for Excavation, Borrow, Common, will be included in the payment for Earthfill, Wave Protection Berm; and Earthfill, Downstream Berm.

b. Bid Item 4 - Excavation, Downstream Berm, Common

(1) This item shall consist of all common excavation which is required to prepare the downstream berm for the drain installation.

(2) Excavated materials shall be placed in the stockpile area shown on the drawings for later placement on the reconstructed berm. The top 12 inches of topsoil shall be salvaged and stockpiled separately.

(3) Measurement and payment will be as specified in Section 9.

(4) Payment will constitute compensation for related subsidiary item(s):

(a) Protection of Excavated Surfaces - Construction Specification 21

(b) Disposal of Waste Materials - Construction Specification 21

c. Subsidiary Item - Excavation, Structure, Common

(1) This item shall consist of the common excavation required for the installation of the toe drain and drain outlet works.

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(2) Excavated materials shall be placed in the stockpile area, or if unsuitable for direct placement in the earthfill, shall be placed in the waste area as directed by the engineer.

(3) No separate payment will be made for Excavation, Structure, Common.

Compensation for Excavation, Structure, Common, will be included in the…