Attachment_1_Construction_Specs.pdf

'°'NRCS

Natural Resources Conservation Service United States Department of Agriculture

MODNR EWPP-FPE Restoration NRCS Office, 1100 Morton Parkway Chillicothe, MO 64601 (660)646-6220

CONSTRUCTION

SPECIFICATIONS

Covering construction of proposed works of improvement for the Emergency Watershed Protection

Program Floodplain Easement (EWPP-FPE) for the following site:

Missouri Department of Natural Resources Pershing State Park: Located approximately 2 miles west of Laclede, Missouri Sections 10, 11 & 15 Township 57 N Range 21 W

Specifications referred to herein shall form part of these Construction and Material Specifications and contractor should exercise special care to refer to them in request for quotations, in orders, and in subcontracts. Materials so specified shall conform to the technical requirements of the respective specifications referred to.

INDEX OF CONSTRUCTION SPECIFICATIONS

2 ................ Clearing and Grubbing 5 ................ Pollution and Erosion Control 6 ................ Seeding, Sprigging and Mulching

7 ................ Construction Surveys 8 ................ Mobilization and Demobilization

21 ................ Excavation

23 ................ Earthfill 94 . . . . . . . . . . ... Contractor Quality Control

Attachment 1

Chapter 2 National Standard Construction Specifications Part 642 National Engineering Handbook

(210-VI-NEH, May 2001) 2-1

Construction Specification 2—Clearing and Grubbing

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

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

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

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

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

3. Marking The limits of the area(s) to be cleared and grubbed will be marked by stakes, flags, tree markings, or other suitable methods. Trees to be left standing and uninjured will be designated by special markings placed on the trunk about 6 feet above the ground surface.

4. Clearing and grubbing All trees not marked for preservation and all snags, logs, brush, stumps, shrubs, rubbish, and similar materials shall be cleared from within the limits of the designated areas. Unless otherwise specified, all stumps, roots, and root clusters that have a diameter of 1 inch or larger shall be grubbed out to a depth of at least 2 feet below subgrade for concrete structures and 1 foot below the ground surface at embankment sites and other designated areas.

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

6. Measurement and payment Method 1—For items of work for which specific units prices are established in the contract, the cleared and grubbed area is measured to the nearest 0.1 acre. Payment for clearing and grubbing is made for the total area within the designated limits at the contract unit price. Such payment

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

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

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

The size of each stump is measured at the top. Diameter is determined by dividing the measured circumference by 3.14.

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

Measured diameter Size designation

(in) (in)

4 to 8 6 8 to 12 10 12 to 24 18 24 to 36 30 36 to 60 48 Over 60 60

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

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

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

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

(210-VI-NEH, May 2001) 2-3

Missouri Department of Natural Resources EWPP-FPE Enhancements NRCS-Missouri 002-4 01/2017

7. ITEM OF WORK AND CONSTRUCTION DETAILS

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

a. Subsidiary Item, Clearing and Grubbing

(1) This item shall consist of site preparation work consisting of clearing and grubbing at locations shown on the drawings. Stripping or Clearing and Grubbing shall not be done until the area is needed in the construction operations.

(2) Location of disposal areas for cleared and grubbed materials shall be approximately as shown on the drawings. Specific locations will be marked or flagged at the site by NRCS.

(3) Material shall be piled or windrowed in borrow ditches adjacent to existing levees or in other locations designated by the Engineer. Following placement, material shall be covered with a minimum of 2 feet of dozer compacted earthfill.

(3) No separate payment will be made for this item. Compensation for Clearing and Grubbing will be included in the appropriate Earthfill and Excavation Bid Items.

Chapter 2 National Standard Construction Specification Part 642 National Engineering Handbook

(210-VI-NEH, January 2014) 5–1

Construction Specification 5—Pollution Control

1. Scope The work consists of installing measures or performing work to control erosion and minimize the production of sediment and other pollutants to water and air from construction activities.

The following BioPreferred® product categories are applicable to this specification: — mulch and compost materials erosion control materials fertilizers dust suppressants agricultural spray adjuvants

2. Material

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

3. Erosion and sediment control measures and works

The measures and works shall include, but are not limited to, the following:

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

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

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

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

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

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

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

Waterways—Waterways for the safe disposal of runoff from fields, diversions, and other structures or measures. These works are temporary and shall be removed and the area restored to its original condition when they are no longer required or when permanent measures are installed.

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

5–2 (210-VI-NEH, January 2014)

4. Chemical pollution The contractor shall provide watertight tanks or barrels or construct a sump sealed with plastic sheets to collect and temporarily contain chemical pollutants, such as drained lubricating or transmission fluids, grease, soaps, concrete mixer washwater, or asphalt, produced as a by-product of the construction activities. Pollutants shall be disposed of in accordance with appropriate state and Federal regulations. At the completion of the construction work, tanks, barrels, and sumps shall be removed and the area restored to its original condition as specified in section 8 of this specification. Sump removal shall be conducted without causing pollution.

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

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

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

All public access or haul roads used by the contractor during construction of the project shall be sprinkled or otherwise treated to fully suppress dust. All dust control methods shall ensure safe construction operations at all times. If chemical dust suppressants are applied, the material shall be a commercially available product specifically designed for dust suppression and the application shall follow manufacturer's requirements and recommendations. A copy of the product data sheet and manufacturer's recommended application procedures shall be provided to the engineer 5 working days before the first application.

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

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

Method 2—For items of work for which lump sum prices are established in the contract, payment is made as the work proceeds and supported by invoices presented by the contractor that reflect actual costs. If the total of all progress payments is less than the lump sum contract price for this item, the balance remaining for this item will be included in the final contract payment. Payment of the lump sum contract price will constitute full compensation for completion of the work.

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

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

NRCS-Missouri 005-3 1/2017

8. ITEMS OF WORK AND CONSTRUCTION DETAILS

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

a) Bid Item 2, Pollution & Erosion Control

1) This item shall consist of scheduling work, installing measures and performing work as needed to control erosion and minimize the production of sediment and other pollutants to the water and air during construction operations.

These temporary pollution control provisions contained herein shall be coordinated with other temporary and permanent pollution control features specified elsewhere in the contract or by state and local laws to assure effective pollution control.

2) Stripping or clearing and grubbing shall not be done until the area is needed in the construction operations.

3) All state and local laws governing pollution shall be followed.

4) The construction site shall be maintained in a clean and safe condition during construction operations.

5) Trash barrels shall be provided and utilized at the site. Trash shall be regularly collected and disposed of properly.

6) No sanitary facilities are available on site. The contractor shall erect and maintain a portable sanitary facility, such as a Port-a-Jon, for the duration of the project. The work site is several miles from the closest public restroom.

The sanitary facility(s) must be dismantled and removed from the site upon completion of the construction work. The waste from the sanitary facility must be removed from it and disposed of offsite at the timing and in the manner permitted by law.

7) All waste oil, chemicals, sewage and contaminated soil caused, generated or created by, the contractor shall be removed from the site and disposed of in approved landfills.

8) Segments of work shall be completed and protected with permanent vegetation as rapidly as is consistent with good construction methods.

9) Earth stockpiles shall be located where runoff and erosion can be controlled in such a manner to minimize the production of sediment and other pollutants to the water during construction operations.

NRCS-Missouri 005-4 1/2017

10) A site-specific Storm water Pollution Prevention Plan (SWPPP) has been developed for the site(s) in this contract. The SWPPP contains information detailing how the Contractor is to control sediment originating from the disturbed areas during construction. Details and locations of best management practices (BMP’s) such as diversions, sediment traps and silt fences are included, if applicable. The SWPPP shall be part of this contract.

At all times from the commencement of work until the work is completed, the Contractor shall have a copy of the SWPPP readily available at the project site.

The Contractor shall notify each subcontractor or entity performing work at the site of the existence of the SWPPP. The Contractor shall ensure proper actions or precautions are taken while on the site to minimize the potential for erosion and to prevent damaging any BMP’s.

11) All pollution control measures and works shall be adequately maintained in a functional condition as long as needed during the construction operation.

During construction, the Government will make regular inspections of all pollution and erosion control practices. The Government’s Representative (GR) will immediately notify the contracting agency of any deficiencies found as a result of the inspection. The contractor will be notified of and shall correct these deficiencies within seven (7) calendar days after such notification. Except as designated by the GR or otherwise shown on the drawings, all temporary measures shall be removed and the site restored to as nearly original conditions as practicable.

12) Measurement and Payment shall be by Method 3.

13) Compensation for all pollution control work items except vegetative establishment shall be included in payment for Bid Item 2, Pollution & Erosion Control.

Compensation for vegetative establishment required by the SWPPP is included in Seeding and Mulching, Bid Items 7, 8 and 9, Construction Specification 6. No separate payment will be made for vegetative establishment.

(210-VI-NEH, January 2014) 6–1

Construction Specification 6—Seeding, Sprigging, and Mulching

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

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

— mulch and compost materials

— erosion control materials

— fertilizers

— agricultural spray adjuvants

2. Material Seed—All seed 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 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.

6–2 (210-VI-NEH, January 2014)

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

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

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

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

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

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

The rate, amount, and kind of mulching or mesh shall be as specified in section 7. Mulches shall be applied uniformly to the designated areas. They shall be applied to areas seeded not later than 2 working days after seeding has been performed. Straw mulch material shall be stabilized within 24 hours of application using a mulch crimper or equivalent anchoring tool or by a suitable tackifier.

When the mulch crimper or equivalent anchoring tool is used, it shall have straight blades and be the type manufactured expressly for and capable of firmly punching the mulch into the soil. Where the equipment can be safely operated, it shall be operated on the contour. Hand methods shall be used where equipment cannot safely operate to perform the work required.

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

The contractor shall maintain the mesh or netting areas until all work under the contract has been completed and accepted.

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

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

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

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

(210-VI-NEH, January 2014) 6–3

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

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

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

All Methods—The following provisions apply to all methods of measurement and payment. Compensation for any item of work described in the contract, but not listed in the bid schedule is included in the payment for the item of work to which it is made subsidiary. Such items and the item(s) to which they are made subsidiary are identified in section 7.

NRCS-Missouri 6-4 1/2017

7. ITEM OF WORK AND CONSTRUCTION DETAILS

Material certifications are required for these items. Item of work to be performed in conformance with this specification and the construction details therefore are:

A. Bid Item 7 Seeding & Mulching

(1) This item shall consist of all work and materials needed to seed and mulch the designated area.

(2) The area to be seeded and mulched shall include:

a) All Dikes (Dike #3 & Dike #4) & Floodways (Dike #3 Floodway &

Floodway #6)

(3) Ground agricultural limestone will be applied at a rate of 1000 lbs./acre of effective neutralizing material.

(4) Fertilizer furnishing the following minimum amounts of available plant food per acre shall be applied. Fertilizer shall be applied uniformly over the designated seeding areas.

Dikes, floodways and disturbed areas as determined by Engineer Nitrogen (N) ............................................................... 60 pounds Phosphate (P205) ....................................................... 90 pounds Potash (K20) .............................................................. 90 pounds

(5) Incorporate lime and fertilizer with 2 passes of a harrow followed by 1 pass of a cultipacker. Areas not accessible to field machinery shall be prepared by hand.

All gullies and rills shall be filled and smoothed prior to application of lime and fertilizer.

(6) PLS is pure live seed. Pure live seed percentages in bulk seed is equal to the percent of purity times the percent of germination as shown on the seed tag. Seed shall be furnished in amounts that equal or exceed the following rates per acre:

Pure Live Seed

Species Rate (lbs. per ac.)

Tall Fescue 30.0

Seeding Dates March 1 through May 15 August 16 through October 15

(7) Apply seed uniformly at a depth of ⅛ to ¼ inch with drill or cultipacker type seeder or broadcast seed uniformly and cover ⅛ to ¼ inch deep with a cultipacker, harrow, or similar tool. Seeding operation shall be performed immediately after seedbed preparation, if seeding dates permit.

NRCS-Missouri 6-5 1/2017

(8) At all other times, all operations will be performed except sowing the seed.

Overseeding will be done during the next seeding period as seeding dates permit.

Increase seeding rates by 50% for overseeding with broadcast seeder only. Notill drilled rates remain standard. There will be no tillage during overseeding operation. Vegetation shall be killed with a chemical burn down consisting of glyphosate and surfactant according to manufacture’s label.

(9) Mulch shall be small grain straw or grass hay relatively free of weed seed. The mulch shall be applied uniformly over the designated area at a rate of 1.5 tons per acre. Anchor mulch with: (1) mulch tacker into the top one [1] inch of soil, or (2) wood cellulose fibertack or a water dispersible mulch tacker following manufacturer's recommendations, or (3) commercial mulch nets or excelsior blankets. Only Option (2) or (3) shall be permitted in areas that are hydro-seeded.

(10) Insofar as practical, all operations shall be performed on the contour.

(11) Payment shall be made by Method 1. This payment will constitute full compensation for the completion of the work.

B. Bid Item 8 Seeding

(1) This item shall consist of all work and materials needed to seed the designated area.

(2) The area to be seeded shall include:

b) Spoil Berms (N, N1, N2, O, P, Q, R, S, T & U)

(4) Incorporate lime with 2 passes of a harrow followed by 1 pass of a cultipacker.

Areas not accessible to field machinery shall be prepared by hand. All gullies and rills shall be filled and smoothed prior to application of lime.

(5) Prairie Cord Grass (Spartina pectinata) 1 gallon containers, with approximately 220 plants per container. Planted at a rate of 108 one gallon containers/AC see Table 1 for spacing.

Planting Dates March 1 through May 15 October 1 through November 15

(6) Prairie Cord Grass (Spartina pectinata) shall be planted in the same year that it is propagated.

(7) When planting Prairie Cord Grass the hole shall be just larger than the container.

Remove plant from container when planting.

(8) Prairie Cord Grass shall be dipped into water, planted according to suppliers recommendation, then watered with at least 1 gallon of water after planting.

(9) Insofar as practical, all operations shall be performed on the contour.

NRCS-Missouri 6-6 1/2017

(10) Payment shall be made by Method 1. This payment will constitute full

C. Bid Item 9 Seeding & Mulching

(1) This item shall consist of all work and materials needed to seed and mulch the designated area.

(2) The area to be seeded and mulched shall include:

c) Spoil Berm B1 & D1

(4) Fertilizer furnishing the following minimum amounts of available plant food per acre shall be applied. Fertilizer shall be applied uniformly over the designated seeding areas.

Dikes, floodways and disturbed areas as determined by Engineer Nitrogen (N) ............................................................... 60 pounds Phosphate (P205) ....................................................... 90 pounds Potash (K20) .............................................................. 90 pounds

(5) Incorporate lime and fertilizer with 2 passes of a harrow followed by 1 pass of a cultipacker. Areas not accessible to field machinery shall be prepared by hand.

All gullies and rills shall be filled and smoothed prior to application of lime and fertilizer.

(6) PLS is pure live seed. Pure live seed percentages in bulk seed is equal to the percent of purity times the percent of germination as shown on the seed tag. Seed shall be Missouri Native Species (Yellow Tag) variety. Seed shall be furnished in amounts that equal or exceed the following rates per acre:

Pure Live Seed

Species Rate (lbs. per ac.)

Virginia Wildrye 20.0

Seeding Dates March 1 through May 15 August 16 through October 15

(7) Apply seed uniformly at a depth of ⅛ to ¼ inch with drill or cultipacker type seeder or broadcast seed uniformly and cover ⅛ to ¼ inch deep with a cultipacker, harrow, or similar tool. Seeding operation shall be performed immediately after seedbed preparation, if seeding dates permit.

(8) At all other times, all operations will be performed except sowing the seed.

Overseeding will be done during the next seeding period as seeding dates permit.

Increase seeding rates by 50% for overseeding with broadcast seeder only. Notill drilled rates remain standard. There will be no tillage during overseeding

NRCS-Missouri 6-7 1/2017 operation. Vegetation shall be killed with a chemical burn down consisting of glyphosate and surfactant according to manufacture’s label.

(9) Mulch shall be small grain straw or grass hay relatively free of weed seed. The mulch shall be applied uniformly over the designated area at a rate of 1.5 tons per acre. Anchor mulch with: (1) mulch tacker into the top one [1] inch of soil, or (2) wood cellulose fibertack or a water dispersible mulch tacker following manufacturer's recommendations, or (3) commercial mulch nets or excelsior blankets. Only Option (2) or (3) shall be permitted in areas that are hydro-seeded.

(10) Insofar as practical, all operations shall be performed on the contour.

(11) Payment shall be made by Method 1. This payment will constitute full

Chapter 2 National Standard Construction Specifications Part 642 National Engineering Handbook

(210-VI-NEH, January 2009)

7–1

Construction Specification 7—Construction Surveys

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

2. Equipment and material Equipment for construction surveys shall be of a quality and condition to provide the required accuracy. The equipment shall be maintained in good working order and in proper adjustment at all times. Records of repairs, calibration tests, accuracy checks, and adjustments shall be maintained and be available for inspection by the engineer. Equipment shall be checked, tested, and adjusted as necessary in conformance with manufacturer's recommendations.

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

3. Quality of work All work shall follow recognized professional practice and the standards of the industry unless otherwise specified in section 9 of this specification. The work shall be performed to the accuracy and detail appropriate for the type of job.

Notes, sketches, and other data shall be complete, recorded neatly, legible, reproducible and organized to facilitate ease in review and allow reproduction of copies for job documentation. Survey equipment that requires little or no manual recording of field data shall have survey information documented as outlined in section 9 of this specification.

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

If a computer program is used to perform the computations, the contractor shall provide the engineer with the software identification, vendor's name, version number, and other pertinent data before beginning survey activities. Computer generated computations shall show all input data including values assigned and assumptions made.

The elevations of permanent and temporary bench marks shall be determined and recorded to the nearest 0.01 foot.

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

The minimum requirements for placing slope stakes shall be at 100-foot stations for tangents, as little as 25 feet for sharp curves, breaks in the original ground surface and at any other intermediate stations necessary to ensure accurate location for construction layout and measurement. Slope stakes and cross sections shall be perpendicular to the centerline.

Significant breaks in grade shall be determined for cross sections. Distances shall be measured horizontally and recorded to the nearest 0.1 foot. Side shots for interim construction stakes may be taken with a hand level.

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

Elevations for concrete work, pipes, and mechanical equipment shall be determined and recorded to the nearest 0.01 foot. Elevations for earth work shall be determined and recorded to the nearest 0.1 foot.

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

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

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

Method 1—Contractor performed surveys shall include:

• checking and any supplemental or interim staking

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

• other surveys as described in section 9 of this specification

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

• establishing line and grade for all work

• setting slope stakes for all work

• checking and any supplemental or interim staking

• establishing final grade stakes

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

• other surveys as described in section 9 of this specification

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

• establishing line and grade for all work

• setting slope stakes for all work

• checking and any supplemental or interim staking

• establishing final grade stakes

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

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

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

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

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

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

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

7. Records All survey data shall be recorded in fully identified standard hard-bound engineering survey field notebooks with consecutively numbered pages. All field notes and printed data shall include the purpose or description of the work, the date the work was performed, weather data, sketches, and the personnel who performed and checked the work.

Electronically generated survey data and computations shall be bound, page numbered, and cross referenced in a bound field notebook containing the index for all survey activities. All work shall follow recognized professional practice.

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

Complete documentation of computations and supporting data for progress payments shall be submitted to the engineer with each invoice for payment as specified in section 9 of the specification. When the contractor is required to conduct initial and final surveys as outlined in section 5, Construction Surveys, notes shall be provided as soon as possible after completion to the engineer for the purpose of determining final payment quantities.

8. Payment Method 1—For items of work for which lump sum prices are established in the contract, payment is made as the work proceeds, after presentation of correct and accurate invoices by the contractor showing related costs and evidence of the charges of suppliers, subcontractors, and others for supplies furnished and work performed. Invoices for the total amount of the contract price will not be accepted until all surveys are complete and required documentation has been determined complete. If the total of such payments is less than the lump sum contract price for this item, the unpaid balance will be included in the final contract payment. Payment of the lump sum contract price will constitute full compensation for completion of all work under the bid item.

Method 2—For items of work for which lump sum prices are established in the contract, payment is made as the work proceeds with progress payment amounts determined as a percentage of the total work planned as projected from the contractor's approved construction schedule. Payment of the lump sum contract price will constitute full compensation for completion of all work under this bid item.

All Methods—Payment will not be provided under this item for the purchase price of materials or equipment having a residual value.

Compensation for any item of work described in the contract, but not listed in the bid schedule will be included in the payment for the item of work to which it is made subsidiary. Such items and the item to which they are made subsidiary are identified in section 9 of this specification.

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9. ITEM OF WORK AND CONSTRUCTION DETAILS

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

a. Bid Item 3, Construction Surveys

(1) Construction surveys are to be according to Method 2, except as detailed below:

a. Field Surveys and Staking to be made by government include:

i. The government will make original and final surveys to determine the quantity of work performed.

ii. The government will stake out slope stakes for all borrows and spoil berms for all four sites. Government slope staking for borrow and spoil berms will be flagged with different color flags distinguishing between cut and fill quantities per drawings.

iii. The government will establish Centerline alignment for all Floodways, and Berms for all four sites.

iv. The government will establish clearing and grubbing limits as identified for the site.

v. Completion of all government staking shall be a coordinated effort between the government and contractor in regards to timing of layout. Government staking shall be planned and performed to coincide with the stripping of vegetation and foundation preparation for each specific item of work. This coordinated effort shall be established and planned during the pre-construction meeting. The government staking shall be performed once. If government staking is destroyed by contractor, additional government staking will require contract modification.

b. Additional Primary Control will be established by the government to supplement Primary Control identified on the drawings. Additional Primary Control Locations will be located during the Pre-Construction Meeting or as approved by the COTR. This Control will be located in such a manner to assist with installation of Earthwork per drawings. No more than three (3) Additional Primary Control points will be established on the site per this item of work.

c. Construction surveys and staking to be made by the Contractor include:

i. Slope staking on all Floodways, and Berms for all four sites.

ii. Layout of the work surveys made from the baselines to locate the work as shown on the drawings and included in the specifications.

iii. Control Line and Elevation surveys to construct the work to the grades and elevations shown on the drawings and in the specifications.

iv. Checkout surveys shall be made of the Floodways, Spoil Berms and Berms (including excavation areas) for the site. The survey checkout will be recorded on survey sheets in standard engineering survey format.

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A copy of the survey shall be submitted to the government for inspection prior to requesting final survey by the government. The checkout survey shall contain complete documentation of the construction to verify compliance with the contract documents. A flag shall be set and left in place at each station checked on the centerline of all Berms and Floodways with the station plainly marked on the flag. A flag shall be set and left in place at each station checked along the catch points of all Spoil Berms. The checkout survey shall consist of the following minimum:

1. Crest of all Berms, Floodways, and Spoil Berms:

This shall include checking the elevation of the top on each end;

at each 200 foot station (ex. 2+00, 4+00). Elevation will be taken at each of the following locations:

1. Centerline Berms, Floodways, and Spoil Berms

2. Actual constructed edge of the top width (both upstream and downstream)

2. Embankments including Berms, Floodways, and Spoil Berms:

Cross sections of the embankment perpendicular to the centerline shall be taken every 400 ft along the alignment. If earthfill feature is less than 400 ft in length a minimum of 2 representative sections shall be taken. One additional Cross Section shall be taken on those earthfill features which contain a Water Control Structure, at the WCS centerline.

The cross sections…