S01 Attachement 2- Construction Specifications.pdf

5–1(210–VI–NEH, January 2014)

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 main-tained 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.

Construction Specification 5—Pollution Control

5–2 (210–VI–NEH, January 2014)

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 sec-tion 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 comple-tion 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 speci-fication, 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 compensa-tion 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 pro-rating 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.

5–3(210–VI–NEH, January 2014)

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. Items of work and construction details

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

1. Work item 002 shall consist of all work and materials necessary for the installation of all temporary erosion and sedimentation control practices.

a. Compost Filter Sock is required to be installed beyond the work area (as specified in the Plan View drawing) before construction begins. Installation shall occur so to contain all runoff from disturbed areas. The filter sock shall be 12-inches diameter and installed as per manufacturer requirements. 2,285 feet of filter sock is to be installed as shown on construction drawings. Alternatives to compost filter sock can be considered with NRCS inspector approval.

b. Disturbed areas shall not be left unseeded for more than 21 days. See specification 6 ‘Items of Work’ for temporary seeding information.

c. Contractor shall remove the filter sock from the construction site upon establishment of permanent seeding. This can be accomplished the following year after seeding and during maintenance mowing.

d. Payment for this shall be as per Method 1 and upon removal of all temporary erosion and sedimentation control practices, and completion of all other work items.

(210-VI-NEH, January 2014) 5–4

(210-VI-NEH, Amend. 2, Sept. 2018) 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 must conform to the current rules and regulations of the State where it is being used and must be from the latest crop available. It must meet or exceed the standard for purity and germination listed in section 7.

Seed must be labeled in accordance with State laws and 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 may be accepted with a test date of more than 9 months before the date of delivery 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 must be as defined in the current State laws relating to agricultural seeds. Each type of seed must be delivered in separate sealed containers and fully tagged unless an exception is granted in writing by the contracting officer.

Fertilizer—Unless otherwise specified, the fertilizer must be a commercial-grade fertilizer. It must meet the standard for grade and quality specified by State law. Where fertilizer is furnished from bulk storage, the contractor must furnish a supplier’s certification of analysis and weight. When required by the contract, a representative sample of the fertilizer must be furnished to the contracting officer for chemical analysis.

Inoculants—The inoculant for treating legume seeds must be a pure culture of nitrogen-fixing bacteria prepared specifically for the species and must not be used later than the date indicated on the container or as otherwise specified. A mixing medium, as recommended by the manufacturer, must be used to bond the inoculant to the seed. Two times the amount of the inoculant recommended by the manufacturer must be used, except that four times the amount must be used when seed is applied using a hydraulic seeder. Seed must be sown within 24 hours of treatment and must not remain in the hydraulic seeder longer than 4 hours.

Lime and other soil amendments—Lime must 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 must meet quality criteria and application requirements specified in section 7.

Mulch tackifiers—Asphalt emulsion tackifiers must conform to the requirements of ASTM D977, Specification for Emulsified Asphalt. The emulsified asphalt may be rapid setting, medium setting, or slow setting. Nonasphaltic tackifiers required because of environmental considerations must be as specified in section 7.

Straw mulch material—Straw mulch must 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 must be air-dry, reasonably light in color, and must not be musty, moldy, caked, or otherwise of low quality. The use of mulch that contains noxious weeds is not permitted. The contractor must 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 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 must be as shown on the plans or as specified in section 7.

6–2 (210-VI-NEH, Amend. 2, Sept. 2018)

4. Seedbed preparation and treatment Areas to be treated must be dressed to a smooth, firm surface. On sites where equipment can operate on slopes safely, the seedbed must 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 must 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 must be removed or disposed of as specified in section 7.

Seedbed preparation must be discontinued when soil moisture conditions are not suitable for the preparation of a satisfactory seedbed as determined by the responsible engineer.

5. Seeding, sprigging, fertilizing, mulching, and stabilizing All seeding or sprigging operations must 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 must be as specified in section 7. Unless otherwise specified, seeding or sprigging must be accomplished within 2 days after final grading is completed and approved.

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

The rate, amount, and kind of mulching or mesh must be as specified in section 7. Mulches must be applied uniformly to the designated areas. They must be applied to areas seeded not later than 2 working days after seeding has been performed. Straw mulch material must 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 must 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 must be operated on the contour. Hand methods must be used where equipment cannot safely operate to perform the work required.

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

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

Maintenance must consist of the repair of areas damaged by water erosion, wind, fire, or other causes. Such areas must be repaired to reestablish the intended condition and to the design lines and grades required by the contract. The areas must 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 is 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, Amend. 2, Sept. 2018) 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 constitutes 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 are determined as specified in section 7. Payment of the lump sum contract price constitutes 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 7.

7. Items of work and construction details

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

1. Item of work 003 shall consist of all work and materials necessary to install all permanent and temporary seeding for the project.

a) Mow field areas (~12.6 acres) and apply two herbicide burndown treatments as per Job Sheet PA 327 – IR Sheet.

b) Apply the following permanent seed mix to spoil areas and proposed north-field swale.

Install double matted erosion control fabric on the proposed north-field swale, as per manufactures recommendations after seeding.

Tall Fescue 40 lbs/acre Red Fine Fescue 10lbs/acre

Perennial Ryegrass 25lbs/acre Cereal Grain 1 bushel/acre

c) Temporary seeding must be done on all remaining disturbed areas. Seeding shall be done immediately after completion of the pothole excavation and spoil area placement, as per the directions below:

a. Area to be seeded shall be measured by the contractor.

b. After finished grading, Cereal Rye shall be applied with a broadcast seeder or drilled.

Ponding areas will not need to be temporary seeded (~0.6 ac). The following rates shall be followed:

Cereal Rye 50 bushel/acre

c. Area shall be mulched with straw (3 ton/acre) following temporary seeding.

d) Permanent seeding of the area around the potholes shall be as per Job Sheet PA327 – Wetland Sedge Mix. A 15’ wide area around the perimeter of the pothole shall be seeded with this mix.

e) Permanent seeding of the herbicide treated area shall be as per Job Sheets PA327 – North Field Plant Mix “A” and South Field Plant Mix “B” respectively.

f) All permanent seeding is to be drilled during the dormant season (between December - March) when soil temperatures are below 40 degrees. A fluffy seed box style drill is to be used (ex. Traux, Great Plains, etc).

*All seeding is to be used upon availability and any substitutions must be approved by NRCS inspector prior to selection and planting.

g) Temporary and permanent seeding and mulching of the disturbed areas (pothole berm, spoil area, access lanes, etc) shall be done immediately after excavation is completed. Disturbed areas shall not be left unseeded for more than 21 days. Permanent seeding (items d & e) shall be done between December - March as noted in the PA327 Job Sheets.

(210-VI-NEH, Amend. 2 Spt. 2018) 6-4

h) Contractor to provide invoices or tags for all seedings for final verification. Invoices/tags to designate plant species and number/amount.

i) Payment for this work item will be lump sum upon completion of all seeding, mulching, and all other work items as per method 2.

a. Maintenance tasks performed within year 1 are part of bid item 003. Maintenance tasks include mowing the site 2 times, controlling noxious weeds and other invasive species by spot spraying, and re-vegetating bare areas. 10% of the bid amount for item 003 will be held until year 1 maintenance tasks are performed. See Job Sheets PA327 – Conservation Cover and items of work noted for bid item 010 and 011.

2. Item of work 004 shall consist of all work and materials necessary to install and maintain all tree and Shrub plantings through the first year of planting.

a) Tree and Shrub Preparation shall be as per Job Sheets PA612 and not as per section 4 (Seedbed preparation and treatment). Shrubs and Trees establishment shall be as per their respective PA612 job sheets (not as per section 5). Tree and Shrub planting shall take place when the ground is free of heavy frost till the end of April.

b) Trees and Shrubs to be mulch and watered in.

c) Trees and shrubs must come from within a 75 miles radius of the site. Written justification must be provided to and approved by the COR in order to go beyond this distance.

d) Year 1 maintenance of trees and shrubs shall be as per Job Sheets PA612. Year 1 is the growing season after which trees and shrubs are planted.

e) The contractor is to maintain no more than 30% mortality of tree and shrubs. Contractor will not be held to extenuating circumstances such as extreme drought or flooding.

f) Payment for this work item will be lump sum upon completion of all tree/shrub establishment as per method 2.

a. Maintenance tasks performed within year 1 are part of bid item 004. 10% of the bid amount for item 004 will be held until year 1 maintenance tasks are performed.

Maintenance tasks are as per the PA612 job sheets and items of work noted for bid item 010 and 011.

3. Item of work 010 shall consist of maintenance of permanent seeding and tree/shrub plantings for the second-year growing season after planting.

a) Items that include maintenance activities include all permanently seeded areas and all tree & shrub plantings.

b) Refer to Job Sheets PA327 and PA612 for year 2 maintenance requirements. Year 1 in Job Sheet is considered the first year of planting.

(210-VI-NEH, Amend. 2 Spt. 2018) 6-5

c) Maintenance shall include mowing the permanently seeded area twice per year during the growing season. This shall include weed whacking around tree tubes and shrub protection fence. Mowing schedule shall depend on timing of Spring and growth of competing weeds.

Typically, the first mowing shall occur late April/May and the second mowing late June/July.

d) Contractor is responsible for mowing to a height of 6 inches, and mowed biomass shall remain on site.

e) Payment for this work item will be lump sum upon completion of mowings as per method 2.

4. Item of work 011 shall consist of maintenance of permanent seeding and tree/shrub plantings for the third-year growing season after planting.

a) Area to be included in maintenance includes all permanently seeded areas and all tree & shrub plantings.

b) Refer to Job Sheets PA327 and PA612 for year 3 maintenance requirements. Year 1 in job sheet is considered time of planting.

c) Maintenance shall include mowing the permanently seeded area twice per year during the growing season. This shall include weed whacking around tree tubes and shrub protection fence. Mowing schedule shall depend on timing of Spring and growth of competing weeds.

Typically, the first mowing shall occur late April/May and the second mowing late June/July.

d) Contractor is responsible for mowing to a height of 6 inches, and mowed biomass shall remain on site.

e) Payment for this work item will be lump sum upon completion of mowings as per method 2.

(210-VI-NEH, Amend. 2 Spt. 2018) 6-6

(210-VI-NEH, May 2001)

Construction Specification 8—Mobilization and Demobilization

1. Scope The work consists of the mobilization and demobilization of the contractor's forces and equipment nec-essary for performing the work required under the contract. It does not include mobilization and demo-bilization for specific items of work for which payment is provided elsewhere in the contract. Mobiliza-tion will not be considered as work in fulfilling the contract requirements for commencement of work.

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

Demobilization shall include all activities and costs for transportation of personnel, equipment, and supplies not required or included in the contract from the site; including the disassembly, removal, and site cleanup of offices, buildings, and other facilities assembled on the site specifically for this contract.

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

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

Payment of the lump sum contract price for mobilization and demobilization will constitute full compen-sation 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 sup-plies.

4. Items of work and construction details

8–1

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

1. Item of work 001 shall include obtaining all work to move equipment and supplies onto and from the site. It is the contractor’s responsibility to comply with all local, state, and federal requirements related to the completion of this work.

a) This item shall also include constructing, maintaining, and removing any access roads which are needed to construct and inspect the project. The contractor is responsible for staying within the construction limits and regrading all access areas to original (or better) condition upon departure. The contractor is also responsible for repairing any areas outside of the construction limits back to original conditions which may have been damaged by the contractor during access, including area outside of the NRCS easement.

b) Contractor is responsible for immediately removing any mud or debris deposited on roads because of construction traffic leaving or entering the easement location.

c) Necessary clearing of access areas shall be the minimum deemed necessary in order to safely move machinery to the work locations. This may include the felling of trees and removal of stumps within the construction limits. Any removed materials shall be piled along either side of the lane.

d) Contractor is responsible for preparing the site as per Construction Specification 6

e) The contractor shall remove from the site and properly dispose of all waste materials. This includes but is not limited to plant containers, tags, removed drain tile, and E&S controls (following permanent seed establishment).

f) The contractor shall comply with PA Act 167 requirements and all of its provisions before performing any excavation. Identified utility locations shall be marked in the field by the utility company responding to the PA One Call.

g) The contractor is responsible for meeting any and all utility setback and crossing requirements. This includes above and below ground utilities. The contractor shall coordinate with the utility company owner when crossing utility lines to access the construction site.

h) Payment for this work item will be lump sum upon successful completion and removal of all equipment and materials from the site.

(210-VI-NEH, May 2001) 8-2

Construction Specification 21—Excavation

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

2. Classification Excavation is classified as common excavation, rock excavation, or unclassified excavation in accordance with the following definitions.

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

Rock excavation is defined as the excavation of all hard, compacted, or cemented materials that re-quire blasting or the use of ripping and excavating equipment larger than defined for common excava-tion. The excavation and removal of isolated boulders or rock fragments larger than 1 cubic yard en-countered in materials otherwise conforming to the definition of common excavation shall be classified as rock excavation. The presence of isolated boulders or rock fragments larger than 1 cubic yard is not in itself sufficient cause to change the classification of the surrounding material.

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

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

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

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

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

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

Blasting shall be done in a manner as to prevent damage to the work or unnecessary fracturing of the underlying rock materials and shall conform to any special requirements in section 10 of this specifica-tion. When specified in section 10, the contractor shall furnish the engineer, in writing, a blasting plan before blasting operations begin.

21–1

4. Use of excavated material 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 spe-cific 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 re-quired 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 the lines and limits shown on the drawings or specified herein required to meet safety requirements shall be the responsibility of the contractor in constructing and maintaining a safe and stable excavation.

7. Borrow excavation When the quantities of suitable material obtained from specified excavations are insufficient to con-struct the specified earthfills and earth backfills, additional material shall be obtained from the desig-nated borrow areas. The extent and depth of borrow pits within the limits of the designated borrow areas shall be as specified in section 10 or as approved by the engineer.

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

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

Concrete that will be permanently covered shall contain not less than five bags of cement per cubic yard.

The concrete shall be placed and cured as specified by the engineer.

Excavation in earth beyond the specified lines and grades shall be corrected by filling the resulting voids with approved, compacted earthfill. The exception to this is that if the earth is to become the subgrade for riprap, rockfill, sand or gravel bedding, or drainfill, the voids may be filled with material conforming to the specifications for the riprap, rockfill, bedding, or drainfill. Before correcting an overexcavation condition, the contractor shall review the planned corrective action with the engineer and obtain ap-proval of the corrective measures.

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9. Measurement and payment For items of work for which specific unit prices are established in the contract, the volume of each type and class of excavation within the specified pay limits is measured and computed to the nearest cubic yard by the method of average cross-sectional end areas or by methods outlined in section 10 of this specification. Regardless of quantities excavated, the measurement for payment is made to the specified pay limits except that excavation outside the specified lines and grades directed by the engineer to re-move 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 mea-surement 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 exca-vation 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 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 exca-vation 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 exca-vation 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 is made at the contract unit price for that type and class of excavation. Such payment will constitute full compensation for all labor, materials, equipment, and all other items necessary and incidental to the performance of the work except that extra payment for backfilling overexcavation will be made in accordance with the following provisions.

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Payment for backfilling overexcavation, as specified in section 8 of this specification, is made only if the excavation outside specified lines and grades is directed by the engineer to remove unsuitable material and if the unsuitable condition is not a result of the contractor's improper construction operations as determined by the engineer.

Compensation for any item of work described in the contract, but not listed in the bid schedule is in-cluded 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. Items of work and construction details

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10. Items of work to be performed in conformance with this specification and the

1. Item of work 005 shall consist of all work to perform 3,946 linear feet of Tile Search as shown on the drawings.

a) Includes searching for existing tile to a depth of 4 feet with a continues trench along the lengths shown on the drawings. If tile is found during the search, the inspector or COR is to be contacted to document the location of the tile and plan for a tile block, bid item 006 (if down slope of the potholes) or a tile extension, bid item 007 (if upslope of the potholes).

b) Section 9, Measurement and payment, is per method 1. Based on the length of tile search performed as noted on the design drawing. Payment includes all Excavation, Earthfill, Topsoil Spreading and final Seeding & Mulching of the disturbed area.

2. Item of work 006 shall consist of all work to install Tile Block’s for any tile line found during the search that is below the planned potholes.

a) Includes crushing, or removing, a minimum of 25 feet of the tile line that is identified. The open 25’ tile line trench should be backfilled with spoil material shall be compacted in 6” lifts.

b) Section 9, Measurement and payment, is to be modified to include a unit price payment for each tile block installed. Qualities noted in the bid schedule are an estimate. The number of tile blocks installed will be reimbursed at the unit price bid amount.

Payment includes all Excavation, Earthfill, Topsoil Spreading, and final Seeding & Mulching of the disturbed area.

3. Item of work 007 shall consist of all work to install Tile Extensions for tile line found during the search that are above the planned pothole excavation.

a) Consists of extending existing tile to the pothole excavation. Includes excavating a pipe trench with positive grade (see Construction Specification 45, Plastic Pipe for more details).

The contractor shall work with the NRCS inspector to determine a suitable outlet location.

b) Section 9, Measurement and payment for this item of work is to be modified to include a linear foot payment per the length of pipe trench installed. The linear foot quantity noted in the bid schedule is the estimated length needed to outlet 2 existing tile lines into excavated potholes. Payment includes all Excavation, Plastic Pipe, Earthfill, Topsoil Spreading, and final Seeding & Mulching of the disturbed area.

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4. Item of work 008 shall consist of all excavation work necessary to construct potholes, spoil areas, and ditch plug as shown on the construction drawings and as staked in the field.

a) Topsoil shall be removed from designated pothole areas and stockpiled within spoil locations shown on the construction drawings or acceptable to the onsite inspector.

Unsuitable material encountered during removal of topsoil will be disposed of at locations shown on the construction drawings. Spreading shall not be conducted when the ground or topsoil is frozen, excessively wet, or otherwise in a condition detrimental to uniform spreading operations.

Pothole finished grade elevations shall be as per the construction drawings (attachment 2). The total cut volume calculated for the creation of all the potholes is 4,821CY. A cut/fill table is included in the drawings.

b) Spoil material from the excavation of the potholes and shall be used as fill in the locations shown on the drawings. Spoil material shall be used to construct the ditch plug as specified in the drawings. Spoil areas shall be topsoiled and seeded. No material is anticipated to be trucked offsite.

c) Section 9, Measurement and payment for this work item is to be modified to include lump sum payment for the creation of the shallow potholes, and all associated spoil placement (including ditch plug). This line item also includes stripping and replacing all topsoil. The excavated area will be surveyed by the inspector to certify that the specified cut and fill volumes are as per the construction drawings prior to final reimbursement. The contractor shall perform their own quality control to ensure the required excavation depths are met.

(210-VI-NEH, May 2001) 21-6

(210-VI-NEH, May 2001) 26–1

Construction Specification 26—Topsoiling

1. Scope The work consists of furnishing and spreading topsoil to specified depths at locations shown on the drawings.

2. Quality of topsoil Topsoil shall consist of friable surface soil reasonably free of grass, roots, weeds, sticks, rocks, or other unsuitable material. Additional quality requirements, if any, are in section 7 of this specification.

3. Furnishing Method 1—Topsoil shall be salvaged from designated earth surfaces that will be disturbed by construc-tion activities. After designated sites have been cleared and grubbed, the topsoil shall be removed from the designated areas and stockpiled at locations shown on the drawings or acceptable to the engineer.

Unsuitable material encountered during removal of topsoil shall be disposed of at locations shown on the drawings or approved by the engineer, or it will be otherwise hauled and disposed of at locations removed from the construction site. The contractor is responsible for complying with all local rules and regulations and the payment of any and all fees that may result from the disposal at locations outside the construction work limits.

Method 2—Topsoil shall be furnished from an offsite source designated by the contractor. The engineer shall be granted access to the source for inspection and acceptance before delivery to the site. Test results and samples shall be provided when specified in section 7 of this specification.

4. Stockpiling Stockpiles of topsoil shall not conflict with the requirements of Construction Specification 5, Pollution Control, when made a part of this contract.

5. Spreading Method 1—Spreading shall not be conducted when the ground or topsoil is frozen, excessively wet, or otherwise in a condition detrimental to uniform spreading operations. Surfaces designated to receive a topsoil application shall be lightly scarified just before the spreading operation.

Following the spreading operation, the topsoil surface shall be left reasonably smooth and without ruts or surface irregularities that could contribute to concentrated waterflow downslope.

Method 2—Spreading shall not be performed when the ground or topsoil is frozen, excessively wet, or otherwise in a condition detrimental to uniform spreading operations. Surfaces designated to receive a topsoil application shall be lightly scarified just before the spreading operation. Where compacted earthfills are designated to be topsoiled, the topsoil shall be placed concurrently with the earthfill and shall be bonded to the compacted fill with the compacting equipment.

Following the spreading operation, the topsoil surface shall be left reasonably smooth and without ruts or surface irregularities that could contribute to concentrated waterflow downslope.

6. Measurement and payment Method 1—The total surface covered by topsoil is measured and the area(s) computed to the nearest square yard. Payment for furnishing and placing topsoil is made at the contract unit price.

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Method 2—The total surface covered by topsoil, except the surface area of embankments, levees, dikes, and other earthfills not included for payment, is measured and the area(s) computed to the nearest square yard.

Payment for topsoil spread on the surface of embankments, levees, dikes, and other earthfills is included in the measurement and payment for that item of earthfill where topsoil application occurred.

Method 3—For items of work for which specific unit prices are established in the contract, the volume of topsoil furnished and spread is computed to the nearest cubic yard by the method of average cross-sectional end areas from surveys of the excavated topsoil stockpile or, if not stockpiled, cross-sectional surveys of the borrow area(s). Payment for furnishing and spreading topsoil is made at the contract unit price.

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

All payment methods—Payment will constitute full compensation for all labor, equipment, material, and all other items necessary and incidental to the completion of the work. This includes excavating, stockpiling, hauling, spreading, and the wasting of unsuitable excavated material.

7. Items of work and construction details

7. Items of work to be performed in conformance with this specification and the

1. Subsidiary item to CS-21, Excavation – Bid item 005, 006, 007, and 008.

a) This item shall consist of all topsoiling work necessary to construct the potholes and tile exploration related work. The work shall include topsoil removal and replacement.

b) In Section 3, Furnishing, method 1 will apply. Topsoil shall be removed from all areas involving construction and/or rehabilitation to a min depth of 6” or to a depth required until mineral soils are exposed.

c) In Section 5, Spreading, method 2 will apply. Design elevations and depths shall be achieved with excavation. Replaced topsoil is accounted for in the pothole dimensions shown in the design drawings. Topsoil shall be stripped only in those areas that are excavation or spoil mounds. After construction, the topsoil shall be replaced onto areas from which it was removed.

d) No separate payment will be made for topsoiling, compensation will be included in payment for Bid Item 005, 006, 007, and 008 Excavation.

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45–1(210-VI-NEH, January 2009)

The work consists of furnishing and installing plastic pipe (except corrugated polyethylene pipe) and the necessary fittings and appurtenances as shown on the drawings or as specified herein.

2. Material Pipe, fittings, and gaskets shall conform to the requirements of Material Specification 547, Plastic Pipe, and as specified in section 14 of this specification or as shown on the drawings.

Perforated pipe shall conform to the requirements of Material Specification 547, Plastic Pipe, and as specified in section 14 of this specification or as shown on the drawings.

Unless otherwise specified, concrete shall conform to the requirements of Construction Specification 32, Structure Concrete, and section 8 of this specification.

Unless otherwise specified, earth backfill shall conform to the requirements of Construction Specification 23, Earthfill.

Unless otherwise specified, drainfill…