Attachment_B_PMC_Demolition_Specifications_PMC_Lincoln_County.pdf

Oriel.Velez Typewritten Text

ATTACHMENT B

Oriel.Velez Typewritten Text

PLANT MATERIAL CENTER

DEMOLITION & SITE CLEARING

Description of Major Items of Work:

Demolition of 3 buildings and site clearing consisting of approximately:

900 Cubic Yards of Common Excavation 500 Cubic Yards of Earthfill 1,300 Square Yards Topsoil

0.5 Acres of Temporary Seeding, Seeding and Mulching

0.5 Acres, Clearing and Grubbing

Pollution Control Demolition

PLANT MATERIAL CENTER

DEMOLITION & SITE CLEARING

Number TITLE

2. Clearing and Grubbing

3. Structure Removal

5. Pollution Control

6. Seeding, Sprigging, and Mulching

8. Mobilization and Demobilization

21. Excavation

23. Earthfill

26. Salvaging & Spreading Topsoil

232. Aggregate Surfacing

716. Silt Fence

NRCS - NEH Part 642 – 5/2001 2-1

CONSTRUCTION SPECIFICATION

2. CLEARING AND GRUBBING

1. SCOPE

The work shall consist of the clearing and grubbing and disposal of trees, snags, logs, 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.

NRCS - NEH Part 642 - 05/01 2-2

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

For items of work for which specific lump sum prices are established in the contract, payment for clearing and grubbing will be 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 completion of the work.

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 of this specification.

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. Bid Item 2, Clearing and Grubbing

(1) This item shall consist of clearing and grubbing the packing shed area, horse barn area, oil shed area and borrow area within the limits indicated on the drawings. The borrow area may or may not be required and is dependent upon the actual earthwork cut and fill quantities. The Contracting Officer Representative shall determine if the borrow site is required.

(2) All material shall be removed from the site.

(3) Payment will be made as the work proceeds after presentation of invoices by the Contractor showing his own clearing and grubbing costs and evidence of the charges of subcontractors, and others, for clearing work performed by them. If the total of such payment is less than the contract lump sum, the unpaid balance will be included in the first invoice following completion of the contract item. Total payment will be the lump sum contract price regardless of actual costs to the Contractor.

PMC Demolition NRCS-Missouri (2-3) 03/15

UCONSTRUCTION SPECIFICATION

U3. STRUCTURE REMOVAL

1. USCOPE

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

2. UMARKING

Method 1—Each structure or structure part to be removed will be marked with stakes, flags, paint, or other suitable method.

Method 2—The area boundaries from which structures must be removed will be marked using stakes, flags, paint, or other suitable method. Structures to remain undisturbed or to be salvaged will be designated by special markings.

3. UREMOVAL

Method 1—All structures designated for removal in the contract shall be removed to the specified extent and depth.

Method 2—Within the areas so marked, all visible and buried structures identified shall be removed to the specified extent and depth.

4. USALVAGE

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

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

5. UDISPOSAL OF REFUSE MATERIALS

Refuse materials resulting from structure removal shall be disposed of in a manner and at locations shown on the drawings or as specified in Section 7 or in an acceptable manner and at locations approved by the Contracting Officer. Disposal by burning shall be in accordance with local rules and regulations.

6. UMEASUREMENT AND PAYMENT

Method 1—For items of work for which specific unit prices are established by the contract, payment for the removal of each structure unit, except fences, is made at the contract unit price. Fences removed or removed and salvaged are measured to the nearest

NRCS-NEH Part 642 – 5/2001 3-1 linear foot. Payment for fence removal or removal and salvage is made at the contract unit prices for each type and size of fence.

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

Method 2—For items of work for which specific lump sum prices are established by the contract, payment for structure removal is made at the contract lump sum price.

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

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 as a contract line item number in the bid schedule, is included in the payment for the item of work to which it is made subsidiary. Such items and items to which they are made subsidiary are identified in section 7 of this specification.

NRCS – NEH Part 642 – 5/2001 3-2 details therefore are:

Bid Item 3 Asbestos Abatement & Bid Item 4 - 6, Demolition

(1) This item shall consist of removing the following items in the construction area as shown on the drawings:

a) Bid Item 5 Packing Shed

• The trees located within the grading limits.

• The earth anchors including the concrete tie-back. There are a total of 32 earth anchors and 16 concrete tie-backs.

• Stone wall approximately 4’ tall and 115’ in length shall be removed.

The stone material shall be removed from the site.

• The entire structure including the roof, wood frame walls, concrete block walls, concrete slab, concrete footings, internal supports, and any other miscellaneous building items.

b) Bid Item 3 and Bid Item 4 Horse Barn

• The entire structure including the asbestos shingles, roof, walls, concrete slab, concrete footings, internal supports, and any other miscellaneous building items.

• A section of the pavement shall be removed as shown on the drawings. A full depth saw-cut shall be made prior to the pavement removal. Any damage incurred to the existing pavement shall be repaired at the Contractor’s expense.

c) Bid Item 6 Oil Shed

• The entire structure including the roof, walls, aggregate base rock and any other miscellaneous building items.

d) Subsidiary Item Utility Lines

• All abandoned utility lines shall be removed from the site encountered within the work area as approved by the Contracting Officer Representative.

• The Contractor shall verify the location of all utilities prior to the construction operations.

(2) The following items shall be salvaged and stockpiled at a location specified by the Contracting Officer Representative:

• The two large steel girders located within the packing shed.

NRCS-Missouri (3-3) 03/15

(3) All materials shall be removed from the site.

(4) Payment shall be at the contract lump sum price.

NRCS-Missouri (3-4) 03/15

NRCS-NEH 642-1/2009 5-1

5. POLLUTION CONTROL

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

2. MATERIAL

All material furnished shall meet the requirements of the material specifications listed in section 8 of this specification.

3. EROSION AND SEDIMENT CONTROL MEASURES AND WORKS

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

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

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

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

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

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

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

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

Waterways—Waterways for the safe disposal of runoff from fields, diversions, and other structures or measures. These works are temporary and shall be removed and the area

NRCS-NEH 642-1/2009 5-2

restored to its original condition when they are no longer required or when permanent measures are installed.

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

4. CHEMICAL POLLUTION

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

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

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.

NRCS-NEH 642-1/2009 5-3

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.

8. ITEM OF WORK AND CONSTRUCTION DETAILS

details therefore are:

a. Bid Item 12, Pollution Control

(1) This item shall consist of scheduling of 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) All waste oil, other chemicals, sewage and soils contaminated by such pollutants shall be removed from the site and disposed of in approved landfills. This pertains to pollution caused or created by contractor.

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

(8) 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.

(9) The contractor shall follow the Storm Water Pollution Prevention Plan or as otherwise approved by the Contracting Officer Representative.

(10) Straw or grass hay bale filters, if needed, shall be constructed as shown on drawings.

(11) Payment shall be by Method 2.

(12) Silt fences shall meet the requirements of Construction Specification 716 and shall be installed as shown on the drawings. Silt fences may be needed at other locations as determined by the Contractor's erosion control plan or as directed by the Contracting Officer’s Representative.

Structure LO-1 Little Otter Creek Watershed NRCS-Missouri (5-4) 07/08

NRCS-NEH Part 642-5/2001 6-1

6. SEEDING, SPRIGGING AND MULCHING

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

2. MATERIALS

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 will be evidence of purity and germination. No seed will be accepted with a test date of more than nine (9) months prior to 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. The fertilizer 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 Engineer 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 by use of a hydraulic seeder. Seed shall be sown within twenty-four (24) hours of treatment and shall not remain in the hydraulic seeder longer than four (4) hours.

Lime and other Soil Amendments - Lime shall consist of Standard Ground Agriculture Limestone, or approved equivalent. Standard Ground Agriculture Limestone is defined as ground limestone meeting current requirements of the State Department of Agriculture.

Other soil amendments shall meet quality criteria and application requirements specified in Section 7.

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

NRCS-NEH Part 642-5/2001 6-2

Straw Mulch Materials - 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 will not be permitted. The Contractor shall provide a method satisfactory to the Engineer for determining weight of mulch furnished.

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

3. SEEDING MIXTURES, SOD, SPRIGS AND DATES OF PLANTING

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

4. SEEDBED PREPARATION AND TREATMENT

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

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

Rocks larger than six (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 and/or sprigs are applied in the specified quantities uniformly on 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 two (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, and shall be applied to areas

NRCS-NEH Part 642-5/2001 6-3 seeded not later than two (2) working days after seeding has been performed. Straw mulch material shall be stabilized within twenty-four (24) hours of application by the use of 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. On sites 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 by injecting it into the mulch material as it is being applied. The mesh or netting stabilizing materials shall be applied smoothly but loosely on the designated areas.

The edges 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 re-establish the intended condition and to the design lines and grades required by the contract. The areas shall be refertilized, reseeded, and remulched prior to the new application of the mesh or netting.

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

When specified as an item of work, mesh or netting is measured to the nearest square yard of surface area covered and accepted. Payment is made at the contract unit price and will constitute full compensation for completion of the work.

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

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

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

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

a. Bid Item 13, Seeding and 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 all of the disturbed area around the packing shed and horse barn removal. The limits of the area will be marked on the ground by Contracting Officer Representative.

(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.

Dam and other disturbed areas as determined by Engineer Nitrogen (N) 60 pounds Phosphate (P205) 90 pounds Potash (K20) 90 pounds

Auxiliary Spillway and Wet Areas Nitrogen (N) 60 pounds Phosphate (P205) 90 pounds Potash (K20) 90 pounds

(5) Incorporate lime and fertilizer to a depth of at least 3" into the soil during preparation of seedbed. All gullies and rills shall be filled and smoothed prior to application of lime and fertilizer.

(6) The seedbed will be prepared with common farm tools such as disks, harrows, and cultipackers. Areas not accessible to field machinery shall be prepared by hand.

NRCS-Missouri (6-4) 03/15

(7) 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:

Dam, Berms, Auxiliary Spillway, Borrow Area, Parking Area, and Haul Road

Percent Pure Live Seed Species of Mix Rate (lbs. per ac.)

Tall Fescue 100% 24.0

Seeding Dates November 16 through June 30

Wet Areas (Includes areas that normally stay wet such as shoreline.)

Species Seeding Rates

Redtop 5 pounds (PLS)

Seed shall be sown from March 16 to June 1, August 1 to October 1, or as a dormant seeding from December 10 to March 15.

From JUNE 1 to AUGUST 1, Brome and Redtop mixtures may be seeded if:

1. There is adequate soil moisture at the time of planting, determined by the same method as for the minimum moisture content for the earthfill materials.

2. Seeding rates are increased by 50%.

(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. There will be no tillage during overseeding operation.

(9) 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.

(10) 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 two 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

NRCS-Missouri (6-5) 03/15 following manufacturer's recommendations, or (3) commercial mulch nets or excelsior blankets. Only Option (2) or (3) shall be permitted in the Articulated Concrete Block Mat area or other areas that are hydro-seeded.

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

(12) Payment for this item shall be by the lump sum amount.

NRCS-Missouri (6-6) 03/15

NRCS-NEH 642-5/2001 8-1

8. MOBILIZATION AND DEMOBILIZATION

The work consists of the mobilization and demobilization of the Contractor’s forces and equipment necessary for performing the work required under the contract.

It does not include mobilization and demobilization for specific items of work for which payment is provided elsewhere in the contract. Mobilization will not be considered as work in fulfilling the contract requirements for commencement of work.

2. EQUIPMENT AND MATERIALS

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

Demobilization shall include all activities and costs for transportation of personnel, equipment, and supplies not required or included in the contract from the site;

including the disassembly, removal and site clean up, of offices, buildings and other facilities assembled on the site specifically for this contract.

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

3. PAYMENT

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

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

4. ITEM OF WORK AND CONSTRUCTION DETAILS

details therefore are:

a. Bid Item 1, Mobilization

(1) This item shall consist of all mobilization and demobilization needed to perform all work.

(2) Ingress-egress road shall be maintained in condition suitable for normal two-wheel drive, light truck traffic. Any damage to existing roads and pavement shall be repaired to the pre-construction condition. No separate payment will be made for this item. Compensation for road and pavement repair shall be included in this bid item.

(3) Payment shall be at the contract lump sum price.

NRCS-Missouri (8-2) 03/15

NRCS-NEH Part 642 – 5/2001 21-1

21. EXCAVATION

l. SCOPE

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

2. CLASSIFICATION

Excavation will be classified as common excavation, rock excavation or unclassified excavation in accordance with the following definitions.

Common excavation is defined as the excavation of all materials that can be excavated, transported, and unloaded by the use of heavy ripping equipment and wheel tractor-scrapers with pusher tractors or that can be excavated and dumped into place or loaded onto hauling equipment by means of excavators having a rated capacity of one cubic yard or larger and equipped with attachments (such as shovel, bucket, backhoe, dragline or clam shell) appropriate to the material type, character, and nature of the materials.

Rock excavation is defined as the excavation of all hard, compacted or cemented materials that requires blasting or the use of ripping and excavating equipment larger than defined for common excavation. The excavation and removal of isolated boulders or rock fragments larger than one (1) cubic yard encountered in materials otherwise conforming to the definition of common excavation shall be classified as rock excavation. The presence of isolated boulders or rock fragments larger than one

(1) cubic yard will not in itself be sufficient cause to change the classification of the surrounding material.

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

Heavy ripping equipment is a rear-mounted, heavy duty, single-tooth, ripping attachment mounted on a track type tractor having a power rating of at least 250 flywheel horsepower unless otherwise specified in Section 10.

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

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

Unclassified excavation is defined as the evacuation of all materials encountered, including rock materials regardless of their nature or the manner in which they are removed.

NRCS-NEH Part 642 – 5/2001 21-2

3. BLASTING

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

Blasting shall be done in such a manner as to prevent damage to the work or unnecessary fracturing of the foundation and shall conform to any special requirements in Section 10 of this specification. When specified in Section 10, the Contractor shall furnish the Engineer in writing, a blasting plan prior to blasting operations.

4. USE OF EXCAVATED MATERIALS

Method 1—To the extent they are needed, all suitable material from the specified excavations shall be used in the construction of required permanent earthfill or rockfill. The suitability of material for specific purposes is determined by the engineer. The contractor shall not waste or otherwise dispose of suitable excavated material.

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

5. DISPOSAL OF WASTE MATERIALS

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

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

6. EXCAVATION LIMITS

Excavations shall comply with OSHA Construction Industry Standards (29CFR Part 1926) Subpart P, Excavations, Trenching, and Shoring. All excavations shall be completed and maintained in a safe and stable condition throughout the total construction phase. Structure and trench excavations shall be completed to the specified elevations and to the length and width required to safely install, adjust, and remove any forms, bracing, or supports necessary for the installation of the work.

Excavations outside of the lines and limits shown on the drawings or specified herein required to meet safety requirements shall be the responsibility of the Contractor in constructing and maintaining a safe and stable excavation.

7. BORROW EXCAVATION

When the quantities of suitable materials obtained from specified excavations are insufficient to construct the specified earthfills and earth backfills, additional

NRCS-NEH Part 642 – 5/2001 21-3 materials shall be obtained from the designated borrow areas. The extent and depth of borrow pits within the limits of the designated borrow areas shall be as specified in Section 10 or as approved by the Engineer.

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

8. OVER-EXCAVATION

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

Concrete that will be permanently covered shall contain not less than five (5) bags of cement per cubic yard. The concrete shall be placed and cured as specified by the Engineer.

Excavation in earth beyond the specified lines and grades shall be corrected by filling the resulting voids with approved compacted earthfill, except 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 over-excavation condition, the Contractor shall review the planned corrective action with the Engineer and obtain approval of the corrective measures.

9. MEASUREMENT AND PAYMENT

For items of work for which specific unit prices are established in the contract, the volume of each type and class of excavation within the specified pay limits will be measured and computed to the nearest cubic yard by the method of average cross-sectional end areas or by methods outlined in Section 10 of this specification.

Regardless of quantities excavated, the measurement for payment will be made to the specified pay limits, except that excavation outside the specified lines and grades directed by the Engineer to remove unsuitable material is included. Excavation required because unsuitable conditions result from the Contractor's improper construction operations, as determined by the Engineer, is not included for measurement and payment.

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

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

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

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

NRCS-NEH Part 642 – 5/2001 21-4 drawings.

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

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

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

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

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

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

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

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

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

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

Payment for each type and class of excavation will be made at the contract unit price for that type and class of excavation. Such payment will constitute full compensation for all labor, materials, equipment, and all other items necessary and incidental to the performance of the work, except that extra payment for backfilling over-excavation will be made in accordance with the following provisions:

NRCS-NEH Part 642 – 5/2001 21-5

Payment for backfilling over-excavation, as specified in Section 8 of this specification, will be made only if the excavation outside specified lines and grades is directed by the Engineer to remove unsuitable material and if the unsuitable condition is not a result of the Contractor's improper construction operations as determined by the Engineer.

Compensation for any item of work described in the contract but not listed in the bid schedule 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 10 of this specification.

10. 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 7, Excavation, Common

(1) This item shall consist of common excavation below the footprint of the packing shed, horse barn and oil shed as shown on the drawings.

(2) The estimated depth of excavation is to be the elevation shown on the drawings. The actual depth will be determined by the Contracting Officer Representative after examination of the materials encountered.

(3) Payment for this item shall be by the lump sum amount.

b. Bid Item 10, Site Grading

(1) This item shall consist of grading the horse barn and oil shed site after demolition activities have been completed. The grading shall produce a final surface that blends with the existing contours. The site grading after the horse barn has been demolished shall be level at the specified elevation of the extents of the building foundation and then blending to existing elevations around the building. The maximum slope for the blending shall not exceed 4:1 (Horizontal: Vertical).

(2) Payment for this item shall be by the lump sum amount.

c. Subsidiary Item, Excavation, Borrow, Common

(1) This item shall consist of common excavation from the designated borrow areas to obtain fill material needed for construction of the permanent works.

(2) This excavation will be performed in a manner that will produce the minimum amount of soil erosion.

(3) No separate payment will be made for this item. Compensation for this excavation will be included in the payment for Earthfill.

d. Subsidiary Item, Excavation, Sediment Removal

(1) This item shall consist of the common excavation required to remove accumulated sediment from silt fence barriers and other pollution control devices.

(2) Deposits will be disposed of in areas designated by the Contracting Officer Representative.

e. Subsidiary Item, Excavation, Foundation, Common (Stripping)

(1) This item shall consist of removing topsoil and other unsuitable material from the parking shed area. Materials suitable for topsoil shall be stockpiled in the locations as shown on the drawings, or as marked in field by the Engineer.

(2) The stripping operation shall be performed in a manner that will produce a minimum amount of soil erosion.

NRCS-Missouri (21-6) 03/15

(3) The depth of the excavation required is estimated to be 1 foot.

(4) No separate payment will be made for this item. Compensation for this excavation will be included in the payment for Earthfill.

NRCS-Missouri (21-7) 03/15

NRCS-NEH Part 642 – 1/2009 23-1

23. EARTHFILL

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

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

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

2. MATERIALS

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

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

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

3. FOUNDATION PREPARATION

Foundations for earthfill shall be stripped to remove vegetation and other unsuitable materials or shall be excavated as specified.

Except as otherwise specified, earth foundation surfaces shall be graded to remove surface irregularities and shall be scarified parallel to the axis of the fill or otherwise acceptably scored and loosened to a minimum depth of two (2) inches.