Construction Specs.pdf

NRCS - April 2011 250-1 KS – Dale Schmidt WRP, McPherson County

Construction Specification 250—Mobilization and Demobilization

1. Scope 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. This includes 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. Measurement and payment 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.

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 4 of this specification.

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

Bid Item 1 - Mobilization and Demobilization

(1) This item shall consist 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.

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

(3) All roads, culverts, bridges, sidewalks, parking lots, fences, structures, etc., shall be protected from damage during the contract period. Road surfaces shall be protected from damages by equipment.

(4) Access shall be as shown on the drawings. If alternate routes are obtained by the contractor, they must be approved by the engineer or the inspector prior to use. All access routes shall be restored by the contractor to a condition equal to or better than the condition prior to the commencement of work under this contract.

(5) The contractor will ensure that the Contracting Officer has notified the Kansas

Division of Water Resources prior to starting any work on the site.

(6) Payment for mobilization and demobilization will be made at the contract lump sum price for the item and will constitute full compensation for all labor, equipment, tools, and other items necessary and incidental to the completion of the work.

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Construction Specification 251—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:

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.

Other—Additional protection measures shall be as specified in section 8 of this specification or as required by federal, state, or local government.

4. Chemical pollution The contractor shall provide watertight tanks or barrels to dispose of chemical pollutants such as drained lubricating or transmission fluids.

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 woody vegetation shall adhere to state and local regulations concerning open burning. Fire prevention measures shall be taken to prevent the start or spreading of wildfires that may result from project activities.

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, unless directed differently by the engineer.

7. Measurement and payment 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.

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

Subsidiary Item - Pollution Control Measures

(1) This item shall consist of providing a sanitary toilet facility for the job site; collecting and disposing of chemical pollutants; installing sediment control filters as shown on the plans; and performing all construction activities in a manner that will minimize water pollution, air pollution, and soil erosion.

(2) No separate payment will be made for Pollution Control Measures. Compensation for this item will be included in the payment for Earthfill, Dike and Ramp Spillways.

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Construction Specification 253—Seeding and Mulching

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

2. Material Seed— Seed labeling, quality, and seed testing shall be in accordance with Kansas Seed Law. For Kansas Seed Law, the germination test is valid for nine (9) months after the end of the month the test was made so long as the seed remains in Kansas. Federal Seed Law pertains to seed shipped across state lines and the germination test is valid for five (5) months after the end of the month the test was made.

For seed purchased during the valid period of the germination test, the analysis report may be considered current for the full seeding period in effect at the time of purchase. For example, if seed is purchased March 1 and the germination test date expires March 31, the analysis report may be considered current if the seed is planted by May 15. If the seed is to be planted during a later seeding season, a new germination test shall be performed.

Mulch material—Mulch shall consist of cut grass or wheat, barley, oat, or rye straw as specified in section 6. The mulch material shall be air-dry, 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 for determining weight of mulch furnished.

3. 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 tilled to a depth of 3 inches 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.

All debris, such as rocks larger than 6 inches in diameter, trash, weeds, and other objects that will interfere with seeding or maintenance operations, shall be removed or disposed of as specified in section 6.

4. Seeding, mulching, stabilizing and dates of planting All seeding operations shall be performed in such a manner that the seed is applied in the specified quantities uniformly in the designated areas. The method and rate of seed application and the approved planting dates shall be as specified in section 6.

The rate, amount, and kind of mulching shall be as specified in section 6. 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. Mulch materials shall be stabilized within 24 hours of application using a mulch crimper or equivalent anchoring tool or by an asphalt

NRCS – April 2011 253-2 emulsion product. 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.

5. Measurement and payment For items of work for which specific unit prices are established in the contract, each area treated will be measured as specified in section 6 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.

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.

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 6.

6. Items of work and construction details

Bid Item 2 - Seeding and Mulching

(1) This item consists of preparing the seedbed and placing seed and mulch to approximate limits shown on the plans or as staked in the field.

(2) The seeding operation shall be completed within 2 days after final grading is completed and approved. Mulching shall be completed as required in Section 5.

(3) 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 double disc or coulter furrow openers with depth bands and press wheels spaced not more than 12 inches apart.

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.

(4) Mulch materials shall consist of hay or straw. All mulch shall be visually inspected and approved prior to application. The mulch shall be applied at a rate of 2 tons per acre if it will be anchored by hand methods or specialized equipment attachments to press the mulch into the soil a minimum of 2 inches. The application rate can be reduced to 1 ton per acre if it will be anchored by an asphalt emulsion at the rate of 300 gallons per acre.

(5) The seed mixture shall be as follows for the designated area. The actual acres to be seeded will be determined from the staked area after final grading is completed.

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Pounds per Acre Species in "Pure Live Seed" (PLS) Kaw Big Bluestem, 1.2 Lovington Blue Grama 0.45 Cimarron Little Bluestem 1.2 Cheyenne Indiangrass 1.2 El Reno Sideoats Grama 2.4 Blackwell switchgrass, 1.8

(6) The area to be seeded will be measured using a handheld Global Positioning System

(GPS) device or similar equipment and payment will be made at the contract unit price for Seeding and Mulching. Payment will constitute full compensation for Seeding and Mulching.

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Construction Specification 254—Earthfill

The work shall consist of the construction of all earthfill structures and earth backfills required by the drawings and specifications.

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

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

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

Fill material shall be free of sod, brush, roots, trash, or other objectionable material. Rock particles larger than 6 inches shall be removed prior to compaction of the fill.

3. Foundation preparation The earth foundation surface shall (after stripping and before placing the first layer of earthfill) be graded to remove surface irregularities, be scarified and moisture-conditioned to a minimum depth of 2 inches to facilitate compaction and a good bond with the earthfill. The moisture content of the foundation materials at the time of compaction shall be the same as the earthfill to be placed on the foundation.

No embankment material shall be placed upon the earth surfaces of excavations, foundation preparation, or previous embankment when such surfaces have dried sufficiently to form shrinkage cracks. Such earth surfaces being readied for embankment shall have all loose, hard, dry, and cracked material removed and then scarified and moisture conditioned to a minimum depth of 2 inches.

4. Placement Earthfill shall not be placed upon a frozen surface nor shall snow, ice, or frozen material be incorporated into the earthfill matrix.

Earthfill shall be placed in approximately horizontal layers starting at the lowest point in the foundation. The earthfill materials shall be placed in nearly horizontal layers not exceeding 9 inches before compaction or as shown on the drawings. Materials placed by dumping in piles or windrows shall be spread uniformly to not more than the specified thickness before being compacted.

Unless otherwise specified in Section 7, machine compaction shall be accomplished by the controlled movement of hauling and spreading equipment over the fill area. Every point on the surface of each lift shall be traversed by not less than one tread track of the equipment.

Hand compaction shall be required in areas inaccessible to heavy equipment. The hand-compacted fill shall be compacted by hand tamping or manually directed power tampers or plate

NRCS - April 2011 254-2 vibrators. The backfill shall consist of clay material (CL or SC) free of stones larger than 2 inches. The fill shall be placed in layers not more than 4 inches thick before compaction. Such protective measures as necessary shall be taken to ensure that the fill does not dry sufficiently to form cracks after placement.

5. Control of moisture content The moisture content of the fill material shall be such that the required compaction can be obtained. Material that is too wet shall be dried to meet this requirement, and material that is too dry shall have water added and mixed until the requirement is met. Adequate moisture will be maintained in the fill material such that when a ball of material is formed by hand it will easily maintain its shape and act as a uniform pliable mass. Tracks from the earthmoving equipment should not exceed one-half of the compacted fill layer depth. The top surface of the preceding layer of fill shall have adequate moisture to permit suitable bonding with the next layer of fill prior to the placement of additional fill.

6. Measurement and payment 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 will be made at the contract lump sum price and will constitute full compensation for completion of the work.

For items of work for which specific hourly rate prices are established in the contract, the volume of earthfill will not be measured for payment. Payment for this item will be made for the total hours of equipment time at the contract hourly rate price and will constitute full compensation for completion of the work.

For items of work for which specific unit prices are established in the contract, the volume of earthfill is determined from the design dimensions as staked in the field and computed to the nearest cubic yard by the method of average cross sectional end areas. The design dimensions shall be the measured surface of the foundation prior to the stripping of vegetation and the specified neat lines of the constructed surface unless otherwise specified in section 7. No deduction in volume will be made for embedded items such as (but not limited to) conduits and water control structures.

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

7. Items of work and construction details

a. Bid Item 3 - Earthfill, Dike and Ramp Spillways

(1) This item shall consist of the construction of the earthfill required for the new dike, the north ramp spillway, and the west ramp spillway as shown on the drawings, including the ramp along the ingress/egress route. The completed work shall conform to the lines, grades, and elevations shown on the drawings or as staked in the field.

(2) Stockpiled topsoil from the stripping operation will be placed on the outer portion of earthfill structures as a part of each lift. Topsoil shall not be less than 6 inches or more than 2 feet thick measured vertically and shall be compacted concurrently with the earthfill.

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Material from the stripping operation that contains excessive amounts of organic matter shall not be used as earthfill or earth backfill material.

(3) Compaction will be obtained by the controlled travel of a sheepsfoot or wedgefoot roller. Fill will be placed in a maximum of 9-inch lifts, and each lift will be completely traversed with 3 passes of the roller. The roller shall be weighted such that the minimum roller pressure is 400 psi. Control of moisture content shall be as described in Section 5.

(4) The volume of Earthfill, Dike and Ramp Spillways will not be measured. The estimated quantity shown on the plans will be used as the pay quantity, and payment will be made at the contract unit price for Earthfill, Dike and Ramp Spillways.

(5) Payment will constitute compensation for the following related subsidiary items:

(a) Pollution Control Measures - Construction Specification 251

(b) Excavation, Common - Construction Specification 255

b. Subsidiary Item - Backfill, Pipe Trench

(1) This item shall consist of placing clay backfill for the Plastic Pipe, 12-Inch Diameter and the Water Level Control Structure, 12-Inch. The completed work shall be as shown on the drawings or as staked in the field.

(2) The initial backfill shall be hand compacted earthfill as shown on the drawings.

Manually directed power tampers or plate vibrators shall include only small hand-held or hand-directed compactors powered by compressed air, internal combustion engines, or electricity.

(3) The final trench backfill shall be machine placed earth backfill. For the length of trench under the existing dike, final backfill shall be conform to the compaction and moisture requirements as specified for Earthfill, Dike and Spillways. For the remaining length of final trench backfill, no compaction or moisture control shall be required beyond that resulting from the placement operation.

(4) No separate payment will be made for Backfill, Pipe Trench. Compensation for

Backfill, Pipe Trench, will be included in the payment for Plastic Pipe, 12-Inch Diameter.

c. Subsidiary Item - Earthfill, Access Berm

(1) This item shall consist of constructing the earthen access berm connecting the water level control structure to the left berm of the west ramp spillway, as described on the drawings or staked in the field.

(2) Compaction shall be accomplished by the controlled travel of the earthmoving equipment. Fill will be placed in a maximum of 9-inch lifts, and each lift will be completely traversed by the earthmoving equipment.

(3) No separate payment will be made for Earthfill, Access Berm. Compensation for

Earthfill, Access Berm, will be included in the payment for Water Level Control Structure, 12-Inch.

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Construction Specification 255 — Excavation

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

2. 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.

3. 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.

4. Borrow excavation When the quantities of suitable material obtained from specified excavations are insufficient to construct the specified earthfill structures and earth backfill, additional material shall be obtained from the designated borrow area or contractor supplied borrow areas.

5. Overexcavation 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.

6. Measurement For items of work for which specific unit prices are established in the contract, the volume of excavation is measured and computed to the nearest cubic yard by the method of average cross-sectional end areas or by methods outlined in section 7 of this specification. The measurement is made to the specified limits except that excavation outside the specified lines and grades directed by the engineer to remove unsuitable material is included.

The measurement 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.

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

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 will be made at the contract lump sum 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. Compensation for such items is identified in section 7 of this specification.

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7. 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 or his representative.

therefor are:

a. Bid Item 5 - Excavation, Existing Dike

(1) This item shall consist of removing the top portion of the existing dike to the elevation shown on the drawings, with the exception of the excavation required for the two spillways.

(2) Excavation of the existing dike shall not proceed until the new dike has been constructed to within one foot of the planned top elevation shown on the drawings.

(3) The final top elevation of the existing dike shall be no higher than the planned elevation shown on the drawings (1447.0), and shall be no lower than elevation 1445.6.

(4) Excavated materials may be deposited at the toe of the existing dike, on the side opposite the channel, as shown on the drawings, or they may be used as fill material for earthfill structures with the approval of the engineer. If placed at the toe of the existing dike, the materials shall be left in a neat and sightly condition and sloped to provide drainage, and compaction shall not be required beyond that resulting from the placing and spreading operation.

(5) The volume of Excavation, Existing Dike will not be measured. The estimated quantity shown on the plans will be used as the pay quantity and payment will be made at the contract unit price for Excavation, Existing Dike.

(6) Payment will constitute compensation for the following related subsidiary items:

(a) Removal of Existing Pipe - Construction Specification 255

b. Subsidiary Item – Excavation, Common

(1) This item shall consist of the excavation required for the construction of depression

1, depression 2, north ramp spillway, west ramp spillway, new dike core trench, and the drainage channel.

(2) Excavation of the ramp spillways through the existing dike shall not proceed until the new dike has been constructed to within one foot of the planned top elevation shown on the drawings.

(3) The depression areas shall be constructed in the locations shown on the plans or as staked in the field. The final bottom elevations of these items will be within 0.3’ of the planned elevation shown on the drawings, but at least 50% of the area will be at the planned elevation or lower. The depression areas shall be enlarged as directed by the engineer if additional borrow material is needed to build the earthfill structures.

(4) Excavated materials shall be used as fill material in earthfill structures shown on the drawings. Any surplus excavated materials shall be placed in the waste area shown

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(5) Any permanent fill placed in the waste area shall not exceed 3 feet of depth, and shall have side slopes of 10:1 (H:V) or flatter. The surfaces of waste area shall be left in a neat and sightly condition and sloped to provide drainage. Compaction of waste materials shall not be required.

(6) The volume of Excavation, Common will not be measured. Compensation for Excavation, Common will be included in the payment for Earthfill, Dike and Ramp Spillways.

c. Subsidiary Item - Excavation, Stripping

(1) This item shall consist of stripping the entire area to be occupied by earthfill in the dike and spillways to a depth of approximately 6 inches below the original ground surface, and stripping the depression area.

(2) Stripping shall be sufficient to remove topsoil, rubbish, organic matter, and other perishable and objectionable material not suitable for the foundation of the dike or as earthfill in the dike.

(3) The volume of Excavation, Stripping will not be measured. Compensation for

Excavation, Stripping, will be included in the payment for Earthfill, Dike and Ramp Spillways.

d. Subsidiary Item – Removal of Existing Pipe

(1) This item shall include removal of the existing pipe through the dike near Station

45+00.

(2) Disposal of the pipe shall be at an approved local landfill.

(3) Backfill of the resulting excavation shall conform to the compaction and moisture requirements as specified for Earthfill, Dike and Ramp Spillways.

(4) Removal of Existing Pipe will not be measured. Compensation for Removal of

Existing Pipe will be included in the payment for Excavation of Existing Dike as appropriate.

e. Subsidiary Item - Excavation, Structure, Common

(1) This item shall consist of the common excavation required for the installation of the

Plastic Pipe, 12-Inch Diameter, and the Water Level Control Structure, 12-Inch.

(2) Excavated materials shall be used for subsequent backfill if suitable, be used in other earthfill items, or 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 payment for Plastic Pipe, 12-Inch Diameter.

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Construction Specification 256—Plastic Pipe

The work consists of furnishing and installing plastic pipe conduits, water control structures, and the necessary fittings and appurtenances as shown on the drawings or as specified herein.

2. Material Plastic pipe conduits shall be manufactured from either Polyvinyl Chloride (PVC) materials or Polyethylene (PE) materials. The water control structure shall be a pre-fabricated, water tight structure constructed of PVC, fiberglass, or other suitable materials. All pipe, fittings, and gaskets shall conform to the requirements as specified in section 9 of this specification or as shown on the drawings.

3. Laying the pipe Plastic pipe conduits complete with fittings and other related appurtenances shall be installed to the lines and grades shown on the drawings or specified in section 9 of this specification. The pipe shall be installed so that there is no reversal of grade between joints unless otherwise shown on the drawings. The pipe foundation shall be excavated a minimum of 4 inches lower than the pipe grade shown on the drawings or staked in the field whenever bedrock, boulders, cobbles, or other material that may cause pipe damage is encountered at planned pipe grade. The pipe shall not be dropped or dumped on the bedding or into the pipe trench.

Just before placement, each pipe section shall be inspected to ensure that all foreign material is removed from inside the pipe. The pipe ends and the couplings shall be free of foreign material when assembled. At the completion of a work shift, all open ends of the pipeline shall be temporarily closed off using a suitable cover or plug.

4. Pipe embedment Earth bedding—The pipe shall be firmly and uniformly placed on compacted earthfill bedding or an inplace earth material capable of supporting the pipe without noticeable settlement. The earth material on which the pipe is placed shall be of uniform density to prevent differential settlement. Unless otherwise specified, a groove that closely conforms to the outside surface of the pipe shall be formed in the bedding. The depth of the groove shall be equal to or greater than

0.3 of the pipe diameter.

5. Backfill Initial backfill—Unless otherwise specified, initial backfill to 6 inches above the top of the conduit is required. Earth haunching and initial backfill material shall consist of soil material that is free of rocks, stones, or hard clods more than 1 inch in diameter. Coarse backfill material shall be the specified sand, gravel, crushed rock, or drainfill material.

Initial backfill shall be placed in two stages. In the first stage (haunching), backfill is placed to the pipe spring line (center of pipe). In the second stage, it is placed to 6 inches above the top of the pipe.

The first stage material shall be worked carefully under the haunches of the pipe to provide continuous support throughout the entire pipe length. The haunching backfill material shall be placed in layers that have a maximum thickness of about 6 inches and are compacted as specified

NRCS – April 2011 256-2 in section 9 of this specification or as shown on the drawings. During compaction operations, care shall be taken to ensure that the tamping or vibratory equipment does not come in contact with the pipe and the pipe is not deformed or displaced.

Final backfill—Final backfill shall consist of placing the remaining material required to complete the backfill from the top of the initial backfill to the ground surface, including mounding at the top of the trench. Final backfill material within 2 feet of the top of the pipe shall be free of debris or rocks larger than 3 inches nominal diameter. Coarse backfill material shall be the specified sand, gravel, crushed rock, or drainfill. Final backfill shall be placed in approximately uniform, compacted layers. Final backfill compaction requirements shall be as specified in section 14 of this specification or as shown on the drawings.

Vehicles or construction equipment shall not be allowed to cross the pipe until the minimum earth cover and required density as specified in section 9 of this specification has been obtained.

7. Joints Unless otherwise specified in section 9 of this specification or shown on the drawings, joints shall be either bell and spigot type with elastomeric gaskets, coupling type, solvent cement bell and spigot, or jointed by butt heat fusion. When a lubricant is required to facilitate joint assembly, it shall be a type having no deleterious affect on the gasket or pipe material.

Pipe joints shall be watertight at the pressures specified except where unsealed joints are indicated.

Pipe shall be installed and joined in accordance with the manufacturer's recommendations.

Laying deflections and joint fitting or stab depths shall be within the manufacturer's recommended tolerances.

8. Measurement and payment For items of work for which specific unit prices are established in the contract, the quantity of each kind, size, and class of pipe is determined to the nearest foot by measurement of the laid length along the crown centerline of the conduit. Payment for each kind, size, and class of pipe is made at the contract unit price for that kind, size, and class. Such payment constitutes full compensation for furnishing, transporting, and installing the pipe including excavation, shoring, backfill, bedding, thrust blocks, and all fittings, appurtenances, and other items necessary and incidental to the completion of the work. Payment for appurtenances listed separately in the bid schedule is made at the contract prices for those items.

Compensation for any items 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 items to which they are made subsidiary are identified in section 9 of this specification.

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9. Items of work and construction details

a. Bid Item 6 - Plastic Pipe, 12-Inch Diameter

(1) This item shall consist of furnishing and installing the plastic pipe for the water level control structure. It shall include the inlet bar guards, outlet animal guard, and all fittings and other items necessary and incidental to the installation as shown on the drawings.

(2) PVC pipe shall conform to ASTM D3034, SDR 35 or ASTM F949. PE Pipe shall be profile wall pipe and conform to ASTM F2648.

(3) The pipe joints shall be bell and spigot with an elastomeric gasket. They shall be considered water tight for pressures less than 10 psi.

(4) The inlet trash guard shall be equivalent to an Agri-Drain heavy duty bar guard and be attached to the pipe using a single u-bolt or similar methods. The outlet animal guard shall be a manufactured guard or sufficient bolts or bars through the pipe to prohibit animal movement into the pipe outlet.

(5) Measurement and payment shall be as specified in Section 8.

(6) Payment will constitute compensation for the following related subsidiary item(s):

(a) Excavation, Structure, Common - Construction Specification 255

(b) Backfill, Pipe Trench - Construction Specification 254

b. Bid Item 7 - Water Level Control Structure, 12-Inch

(1) This item shall consist of furnishing and installing the inline water level control structure. It shall include all fittings and other items necessary and incidental to the installation as shown on the drawings.

(2) The height of the inline water level control structure shall be 4 feet, and the inlet and outlet connectors shall be sized to connect to the 12-inch diameter drawdown pipe with flexible sewer couplers. The structure shall be installed with the invert elevation as shown on the drawings or staked in the field.

(3) The walls and floor of the inline water level control structure shall be constructed of polyvinyl chloride (PVC) with a minimum thickness of 1/2 inch. The structure shall have metal reinforced corners and a lockable top with grate. The joints at the edges and bottom of the structure shall be sealed with waterproof caulking.

(5) The stoplogs shall be constructed of 1/2 inch PVC and shall be constructed so that a seal is provided between individual stoplogs installed in the structure and between the stoplogs and the stoplog track. The stoplogs shall have stainless steel lifting hooks, and a handle shall be provided for use when installing or removing stoplogs.

An adequate number of stoplogs shall be provided to achieve approximately 40 inches of elevation difference from the bottom of the structure to the top of the stoplogs.

NRCS – April 2011 256-4

(6) Water control structures constructed of suitable materials and providing similar flow characteristics may be substituted with the approval of the Contracting Officer Technical Representative.

(7) The earth backfill adjacent to the inline water level control structure shall meet the requirements of Earthfill, Hand-Compacted.

(8) Measurement shall be as specified in Section 8. Payment for water level control structures shall be at the contract lump sum price for this item and will constitute full compensation for all labor, equipment, tools, and other items necessary and incidental to the completion of the work.

(6) Payment will constitute compensation for the following related subsidiary item(s):

(a) Earthfill, Access Berm - Construction Specification 254

NRCS –April 2011 267-1

Construction Specification 267—Chemical Weed Control

The work will consist of providing and applying a labeled residual herbicide to an area of land to be planted to a mix of native grasses and forbs or an area planted to containerized trees as required by the drawings, worksheets, and specifications. All work shall be completed in a skillful and workmanlike manner and the completed job shall present a professional appearance.

2. Location The location and application of the herbicide application shall be as specified on the drawings, worksheets or as staked in the field.

3. General Criteria All pest management methods must comply with federal, state, and local regulations. This includes management plans for invasive species, noxious weeds, and disease vectors. Compliance with the Food Quality Protections Act, Federal Insecticide, Fungicide and Rodenticide Act, Worker Protection Standard and Interim Endangered Species Protection Program is required. All restrictions and requirements listed on the product label will be adhered to. A safety plan for individuals exposed to chemicals will be in place including telephone numbers for emergency treatment centers. Signs will be posted around sites that have been treated as required by the herbicide label. Properly dispose of excess herbicide and herbicide containers. Application equipment shall be calibrated according to KSU Extension and/or manufacturer recommendations. Worn nozzles, cracked hoses or other faulty equipment will be replaced before application.

4. Herbicide Products, Rates, and Application Methods The selected herbicide(s) shall be labeled for the intended use, rate of application and method of application. The selected herbicide shall be based on the recommendations found in Kansas State University Extension publication 2010 Chemical Weed Control, SRP-1027 or as specified in section 6.

5. Measurement and payment For items of work for which specific unit prices are established in the contract, each area treated will be measured as specified in section 6 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.

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.

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 6.

NRCS –April 2011 267-2

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

Bid Item 8 - Chemical Weed Control

(1) This item of work includes providing the selected herbicides and the application of the selected herbicides according to product label on the area shown on the drawings or as staked in the field.

(2) Application will be by broadcast spray with approved application equipment. The equipment shall be made available for inspection prior to application at the discretion of the inspector.

(3) The selected herbicide will be as shown below. The use of product names is for informational purposes only and is not an endorsement.

a. The herbicide shall contain imazapic equivalent to the herbicide product commonly known as

Plateau as described in the 2010 Chemical Weed Control, SRP-1027. The rate of herbicide application shall be equivalent to or equal to 4.0 ounces per acre of Plateau. Adjuvants will be added to the herbicide mix as recommended by the product(s) label.

(4) At least 5 - 7 gallons of water per acre will be used as the herbicide carrier.

(5) The herbicide application of Journey on winter wheat will occur after complete cover has been accomplished. The acceptable application dates shall be November 10 – 20 and April 1 – 15 to insure the wheat is actively growing. The herbicide application of Plateau will occur within 5 days after seeding.

(6) The area to be sprayed will be as measured on the maps and drawings or be measured as staked in the field using a handheld Global Positioning System (GPS) device or similar equipment.

Payment for the area to be sprayed will be based on the design quantity for Seeding Upland Wildlife Habitat and will be made at the contract unit price for Chemical Weed Control. Payment will constitute full compensation for labor, equipment, tools, and all other items necessary and incidental to the completion of this item of work.