S01 Atch. 1 Specifications.pdf

Beaver Creek Dam (NRCS PA-433) Rehabilitation Project

Chester County, Pennsylvania

Specifications

Prepared for:

United States Department of Agriculture Natural Resources Conservation Service

Harrisburg, Pennsylvania

Prepared by:

Gannett Fleming, Inc.

Harrisburg, Pennsylvania

December 2020

BEAVER CREEK DAM (PA-433)

CONSTRUCTION SPECIFICATIONS

NO. TITLE Page 3 Structure Removal 3-1 5 Pollution Control 5-1 6 Seeding, Sprigging, and Mulching 6-1 7 Construction Surveys 7-1 8 Mobilization and Demobilization 8-1 9 Traffic Control 9-1 10 Water for Construction 10-1 11 Removal of Water 11-1 21 Excavation 21-1 23 Earthfill 23-1 24 Drainfill 24-1 26 Topsoiling 26-1 27 Diversions and Waterways 27-1 31 Concrete for Major Structures 31-1 34 Steel Reinforcement 34-1 36 Roller Compacted Concrete 36-1 45 Plastic Pipe 45-1 61 Rock Riprap 61-1 63 Treatment of Rock Surfaces 63-1 71 Water Control Gates 71-1 81 Metal Fabrication and Installation 81-1 94 Contractor Quality Control 94-1 95 Geotextile 95-1 96 Field Office 96-1 402 Stainless Steel Conduit 402-1 405 Instrumentation 405-1 407 Precast Concrete Endwalls 407-1

(210-VI-NEH, January 2009) 3-1

Construction Specification 3—Structure Removal

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

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

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

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

6. Measurement and payment 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 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, (210-VI-NEH, January 2009) 3-2 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.

11/23/2020 10:41 AM

Beaver Creek Dam 3-3

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

a. Bid Item 1, Structure Removal

(1) This item shall consist of the demolition and partial removal of the existing riser structure and removal of appurtenances from the existing riser structure. All concrete rubble and debris from the existing riser structure shall be considered Earthfill, Random, Class C, subject to Item 7.a.(3) and disposed of in the on-site spoil pile. All appurtenances including, but not necessarily limited to, mechanical equipment, gates, operators, railings, grating, ladders, etc.

shall be disposed of offsite.

(2) This item does not include temporary removal and replacement of fencing to facilitate access to the site for construction, which is considered incidental to the completion of the work and shall be performed at the Contractor’s expense.

(3) The disposal of all materials shall be performed in a lawful and environmentally acceptable manner that does not violate local rules and regulations.

(4) Concrete demolition material disposed of in the on-site spoil pile must be free of rebar and clean of grease, oil, or other deleterious matter. Concrete must be crushed or so broken as to satisfy the gradation requirements specified elsewhere in the Contract Documents for the type of fill indicated.

(5) The Contractor shall install measures and take the necessary precautions to prevent debris from falling into the bottom of the existing riser structure or from entering the existing principal spillway conduit.

(6) Section 2 does not apply.

(7) Method 1 of Section 3 shall apply. The limits of demolition for the existing riser are as shown on the drawings. All existing metals and other appurtenant features shall be removed from the existing riser.

(8) Method 2 of Section 6 shall apply. Payment will be made as the work proceeds. Progress payment amounts will be determined based on an on-site agreement, between the Contractor and the COR, on the estimated percentage of the total work completed during the payment period. If the total of all progress payments is less than the contract lump sum price for this item, the unpaid balance will be included in the final payment for this item. Total payment will be the lump sum contract price for this item, regardless of actual cost to the Contractor.

(210-VI-NEH, January 2014) 5-1

Construction Specification 5—Pollution Control

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

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

— mulch and compost materials

— erosion control materials

— fertilizers

— dust suppressants

— agricultural spray adjuvants

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

3. Erosion and sediment control measures and works The measures and works shall include, but are not limited to, the following:

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

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

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

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

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

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

Sediment filters—Straw bale filters or geotextile silt fences trap sediment from areas of limited runoff.

Sediment filters shall be properly anchored to prevent erosion under or around them. Silt fences shall be installed and maintained in accordance with ASTM D6462. These filters are temporary and shall be removed and the area restored to its original condition when they are no longer required or when permanent measures are installed.

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

(210-VI-NEH, January 2014) 5-2

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.

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.

(210-VI-NEH, January 2014) 5-3

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.

11/23/2020 11:18 AM

Beaver Creek Dam 5-4

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

a. Pollution Control, General Requirements

(1) General Requirements apply to all proceeding Bid and Subsidiary Items.

(2) Take precautions in conduct of operations as necessary to avoid contaminating water in adjacent watercourse or impoundments such as lakes, reservoirs, etc. Do not discharge pollutants such as chemicals, fuels, lubricants, bitumens, raw sewage, and other harmful waste into or along side of rivers, streams, impoundments or into natural or made-made channels leading to them. Do not discharge water used during work on the Project that has become contaminated, into rivers, streams, or impoundments.

(3) Comply with applicable regulations of the Commonwealth of Pennsylvania Department of Environmental Protection and any other statutes relating to prevention and abatement of pollution.

(4) Comply with all permits issued to CCWRA by regulatory agencies.

(5) Conduct all earthwork, moving of equipment, water control of excavations or other operations likely to create silting, so as to minimize pollution of rivers, streams, and impoundments. Do not deposit excavated material in or so near to rivers, streams, or impoundments that it will be washed away by high water or runoff.

(6) Pollution control measures shall be installed, stabilized, and functional prior to the start of earth disturbance activities within the tributary area to those facilities.

(7) Equipment shall not be operated in live streams except as may be required to construct channel changes and temporary or permanent structures located in live streams. Frequent fording of live streams with construction equipment will not be permitted.

Temporary bridges, culverts, or other structures shall be installed wherever an appreciable number (more than once a day) of stream crossings are necessary.

(8) Protective cover shall be applied to disturbed areas as soon as work has been completed in the area, and/or whenever work in the disturbed area will be delayed or stopped more than 4 continuous days. Protective cover shall be applied to disturbed areas by mulching with straw or by seeding and mulching with straw. Materials and workmanship for providing protective cover shall be in accordance with Construction Specification 6, Seeding, Sprigging and Mulching.

In areas that are excessively rough or steep, as determined by the COR, seedbed preparation shall consist of applying fertilizer then tracking up and down the slope with crawler equipment. In areas too wet for crawler equipment to operate, as determined by the COR, no seedbed preparation shall be required.

Seed mixtures for protective cover shall be Type I or Type II. The type of mixture used for temporary seeding shall depend on the dates that the seed is sown. Type I seed mixture shall be sown between April 1 and September 30 for temporary seeding. Type II seed mixture

Beaver Creek Dam 5-5 shall be sown between October 1 and December 31 for temporary seeding. If temporary stabilization measures are required between January 1 and March 31, apply straw mulch without seeding at a rate of three tons per acre until the allowable seeding dates at which time seed shall be applied. Anchor straw mulch with a non-asphaltic type mulch binder.

Type I seed mixture shall consist of Johnstone Tall Fescue sown at the rate of 50 pounds per acre and Redtop sown at the rate of 3 pounds per acre. Seed purity for Johnstone, tall fescue shall be 95 percent minimum and the germination rate shall be 85 percent minimum. Seed purity for Redtop shall be 90 percent minimum and the germination rate shall be 85 percent minimum.

Type II seed mixture shall consist of cereal rye sown at the rate of 120 pounds per acre. Seed purity shall be 95 percent minimum and the germination rate shall be 80 percent minimum.

Fertilizer having an analysis of 10-20-20 shall be applied at the rate of 500 pounds per acre to all areas to be seeded with Type I seed mixture.

Fertilizer having an analysis of 10-10-10 shall be applied at the rate of 400 pounds per acre to all areas to be seeded with Type II seed mixture.

Straw mulch shall be applied uniformly to disturbed areas that have been seeded at the rate of 2 tons per acre and to disturbed areas that are not seeded at the rate of 3 tons per acre.

Straw mulch will be anchored by applying a non-asphaltic mulch binder consisting of free flowing silicate powders with hydrophilic polymer additives. Apply to the straw mulch cover according to the manufacturer's recommendations.

The Contractor shall submit in writing to the COR a request for approval of the selected non-asphaltic type mulch binder. The request shall include sufficient descriptive information (manufacturer's specifications) to allow a determination of acceptability and suitability to be made.

The use of asphaltic mulch binders is prohibited.

b. Bid Item 2, Erosion and Sediment Control

(1) If the Contractor’s plan for Erosion and Sediment Control (ESC) differs from the approved plan as shown on the Drawings, the Contractor shall prepare and make application for a modification to the approved Erosion and Sediment Control (ESC) Plan Permit to the applicable reviewing agencies. Said ESC Plan shall also be submitted to the COR following the requirements of Section 8.a.(2).

(2) This bid item shall consist of furnishing, installing, maintaining, and removing erosion and control features in accordance with the approved ESC Plan Permit and all local, state, and federal regulations. Includes application of temporary fertilizer, temporary straw mulch, compost filter sock, temporary seeding, and mulching.

(3) Temporary fertilizer shall be applied to disturbed areas prior to seedbed preparation and seeding.

(4) The Contractor shall maintain a 0.5-ton stockpile of straw mulch material at or near the job site.

Beaver Creek Dam 5-6

(5) Method 3 of Section 7 will apply. Total payment will be the lump sum contract price for this Bid Item, regardless of actual cost to the Contractor.

c. Bid Item 3, Construction and Maintenance of Access Roads

(1) This Bid Item shall consist of constructing and maintaining existing and new access roads

(including haul roads) throughout their period of use. This item shall also include installing, maintaining and removing waterbar(s) as shown on the Drawings. This item includes installing, maintaining, and removing temporary wetland crossing(s) as shown on the Drawings. The Contractor shall submit for approval of the COR in writing and with drawings the location and details of the Contractor’s proposed access roads including any required clearing, excavation, and fill prior to construction of the access roads. This item includes any incidental clearing, grading, excavation, or fill required to construct viable access roads or to restore any access roads. This item includes constructing and maintaining the rock construction entrances and supplying and placing geotextile, rock or gravel used to surface the access roads and parking area at the field offices and staging and batch plant areas. Ensuring and maintaining the safety and adequacy of all access roads shall be the sole responsibility of the Contractor. The Contractor is advised that the access roads from/to the dam site and field office will require continuous maintenance. This item shall include furnishing, applying, and maintaining dust suppressant for the control of dust on the haul roads at locations and times approved by the COR.

(2) Upon completion of the Work, the Contractor shall remove all temporary access/haul roads and restore the site to its pre-construction condition. Permanent access roads shall receive a final surface treatment at the end of construction to ensure the grades and conditions specified on the Drawings and in the Construction Specifications are satisfied and will be subject to COR approval. Unless specifically identified as permanent on the Drawings, all access/haul roads shall be temporary.

(3) The Contractor shall submit to the COR for approval the information detailing dust suppressant that meets the requirements of this specification at least 10 days prior to applying dust suppressant on site. Calcium Chloride or petroleum products shall not be used as a dust suppressant unless otherwise approved by the COR. Dust suppressant shall have the following properties and shall meet the following requirements:

(a) Ecologically and Environmentally Safe (Safe for Humans and Animals)

(b) Vegetation Safe (Will not harm Plant Life)

(c) Non-regulated for Transportation

(d) Self-Penetrating and Self-Wetting Properties

(e) Ultraviolet Ray Resistant (Will not break down from sun)

(f) Non-Tracking and Non-Transferable (Will not stick to tires or objects)

(g) Non-Dissipating (Will not wash away with rain or water)

(h) Non-Corrosive & Safe for All Equipment

(i) Non-Volatile, Non-Flammable

(j) Non-Hazardous, Non-Toxic

(4) Drainage improvements and maintenance of the access roads throughout construction is the responsibility of the Contractor. The Contractor is responsible for keeping areas where access roads meet public roads clean and free from mud, sand, and gravel tracked from

Beaver Creek Dam 5-7 delivery trucks, construction vehicles and equipment, etc. The Contractor shall sweep roadways and hand clean public road surfaces as required immediately after contamination or as directed by the COR.

(5) Payment for any work that is required by this specification, and which is not measured for payment under another Bid Item, will be measured for payment under this Bid Item.

(6) Method 3 of Section 7 will apply. Total payment will be the lump sum contract price for this

Bid Item, regardless of actual cost to the Contractor.

(7) Items of work subsidiary to this Bid Item include:

(a) Water for Access Roads, Construction Specification 10 – Water for Construction.

(b) Excavation, Construction and Maintenance of Access Roads, Unclassified, Construction

Specification 21 – Excavation.

(c) Earthfill, Construction and Maintenance of Access Roads, Construction Specification 23

– Earthfill.

(d) Type I Geotextile, Construction Specification 95 - Geotextile.

d. Subsidiary Bid Item, Pumped Water Filter Bags

(1) No separate payment will be made for installation, maintenance, and removal of pump water filter bags and associated intake/discharge hoses as shown on the Drawings.

(2) Payment for pumped water filter bags and associated intake/discharge hoses shall be included in Bid Item 13, Dewatering the Construction Site.

(210-VI-NEH, January 2014) 6–1

Construction Specification 6—Seeding, Sprigging, and Mulching

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

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

— mulch and compost materials

— erosion control materials

— fertilizers

— agricultural spray adjuvants

2. Material Seed—All seed shall conform to the current rules and regulations of the state where it is being used and shall be from the latest crop available. It shall meet or exceed the standard for purity and germination listed in section 7.

Seed shall be labeled in accordance with the state laws and the U.S. Department of Agriculture rules and regulations under the Federal Seed Act in effect on the date of invitations for bids. Bag tag figures are evidence of purity and germination. No seed will be accepted with a test date of more than 9 months before the delivery date to the site.

Seed that has become wet, moldy, or otherwise damaged in transit or storage will not be accepted. The percent of noxious weed seed allowable shall be as defined in the current State laws relating to agricultural seeds. Each type of seed shall be delivered in separate sealed containers and fully tagged unless exception is granted in writing by the contracting officer.

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

Inoculants—The inoculant for treating legume seeds shall be a pure culture of nitrogen-fixing bacteria prepared specifically for the species and shall not be used later than the date indicated on the container or as otherwise specified. A mixing medium, as recommended by the manufacturer, shall be used to bond the inoculant to the seed.

Two times the amount of the inoculant recommended by the manufacturer shall be used except four times the amount shall be used when seed is applied using a hydraulic seeder. Seed shall be sown within 24 hours of treatment and shall not remain in the hydraulic seeder longer than 4 hours.

Lime and other soil amendments—Lime shall consist of standard ground agriculture limestone, or approved equivalent. Standard ground agriculture limestone is defined as ground limestone meeting current requirements of the State Department of Agriculture. Other soil amendments shall meet quality criteria and application requirements specified in section 7.

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

Straw mulch material—Straw mulch shall consist of wheat, barley, oat or rye straw, hay, grass cut from native grasses, or other plants as specified in section 7. The mulch material shall be air-dry, reasonably light in color, and shall not be musty, moldy, caked, or otherwise of low quality. The use of mulch that contains noxious weeds is not permitted. The contractor shall provide a method satisfactory to the contracting officer for determining weight of mulch furnished.

(210-VI-NEH, January 2014) 6–2

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

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

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

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

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

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

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

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

The rate, amount, and kind of mulching or mesh shall be as specified in section 7. Mulches shall be applied uniformly to the designated areas. They shall be applied to areas seeded not later than 2 working days after seeding has been performed. Straw mulch material shall be stabilized within 24 hours of application using a mulch crimper or equivalent anchoring tool or by a suitable tackifier. When the mulch crimper or equivalent anchoring tool is used, it shall have straight blades and be the type manufactured expressly for and capable of firmly punching the mulch into the soil. Where the equipment can be safely operated, it shall be operated on the contour. Hand methods shall be used where equipment cannot safely operate to perform the work required.

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

The contractor shall maintain the mesh or netting areas until all work under the contract has been completed and accepted. Maintenance shall consist of the repair of areas damaged by water erosion, wind, fire, or other causes.

Such areas shall be repaired to reestablish the intended condition and to the design lines and grades required by the contract. The areas shall be refertilized, reseeded, and remulched before the new application of the mesh or netting.

(210-VI-NEH, January 2014) 6–3

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

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

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.

11/23/2020 12:27 PM

Beaver Creek Dam 6-4

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

a. Bid Item 4, Erosion Control Blanket for Steep Slopes

(1) This item shall consist of placing erosion control blanket as described in this specification, as shown on the Drawings or as determined by the COR.

(2) Permanent seeding shall be held in place with Erosion Control Matting at the following locations.

(a) All slopes 3H:1V and steeper.

(b) Other areas as specified on the Drawings.

(3) Install the Erosion Control Blanket in accordance with manufacturer’s recommendations or as shown on the Drawings with approval of the COR. Edges of adjacent rolls shall overlap 12 inches as shown on the Drawings.

(4) Erosion Control Blanket shall be a commercially prepared rolled erosion control product with a functional longevity of up to 24 months, consisting a machine-produced mat of 100 percent coconut fiber matrix (0.5 pounds per square yard). The blanket shall be covered on the top and bottom sides with 100% biodegradable woven natural organic fiber netting. Thread shall be biodegradable. The Erosion Control Blanket shall be able to withstand a shear stress of up to 2.35 pounds per square foot in an unvegetated condition and velocities of up to 10.0 feet per second in an unvegetated condition.

The thickness of the Erosion Control Blanket shall be 0.23 inches, the tensile strength shall be 206.4 pounds per foot, and the light penetration shall be 16.2 percent.

(5) Method 1 of Section 6 will apply. Payment will be measured to the nearest square yard.

b. Subsidiary Item, Seeding and Mulching

(1) This item shall consist of seeding and mulching to establish permanent cover over all disturbed areas within the construction limits shown on the Drawings. Temporary stabilization measures shall be as defined in CS 5, Temporary Seeding and Mulching.

(2) Disturbed areas shall be seeded to establish permanent cover after work has been completed in that area. No permanent seeding shall be done between October 1 and December 1.

(3) The approved lines and grades for permanent seeding, at the time of permanent seeding, shall be maintained during and after the seeding and mulching operation. Any area that has been damaged or had part or all of the seeding material removed, by any means, shall be repaired before acceptance will be made.

The area to be repaired shall be filled and/or graded as needed to bring it back to original elevation and grade, seedbed prepared, and then it shall be refertilized, limed, seeded, and mulched at the specified rates.

(4) Lime: The rate of application will be determined by soil test. The Contractor shall submit soil test results prepared by a certified laboratory to the COR one week prior to seeding. Lime shall be added to correct the pH to 6.5. The maximum amount of lime required will be 4 tons per acre.

(5) Fertilizer: The rate of application will be determined by soil test. The Contractor shall submit soil test results prepared by a certified laboratory to the COR one week prior to seeding. Use a slow-release nitrogen fertilizer as stipulated by the soil test:

Beaver Creek Dam 6-5

(6) Seedbed Preparation: Fertilizer and lime shall be applied prior to seedbed preparation. Equipment seedbed preparation shall be by one of the following methods:

• Scarifying across the slope to a minimum depth of 3 inches.

• Disking across the slope to a minimum depth of 3 inches.

• Grading and tracking up and down the slope with a crawler tractor.

Areas inaccessible to equipment shall be hand-tilled to a depth of 1-1/2 inches.

(7) Seed: All legume seeds shall be inoculated. Seed may be inoculated in the hydroseeder when this type of equipment is used.

All seed shall meet or exceed the following standards for purity, germination, and application rate:

Species Percent Purity

Percent Germination Rate/Acre1

Fawn Tall Fescue2 95 85 60 lbs

Triple Rye Grass 95 85 90 lbs

1. When seeding is performed between April 15 and August 1 the rates of seed per acre shown above shall be increased by 50 percent.

2. Tall Fescue shall be Johnstone or other endophyte-free variety.

(8) Mulch: Straw or hay mulch shall be applied uniformly over the area at the specified rate per acre. A non-asphaltic mulch binder consisting of a free-flowing silicate powder with hydrophilic polymer additives mixed in water shall be applied according to the manufacturer's recommendation.

The Contractor shall submit in writing to the COR a request for approval of the selected mulch binding agent. The request by the Contractor shall include sufficient descriptive information (manufacturer's specifications) to allow a determination of acceptability and suitability to be made.

The use of asphaltic mulch binders is prohibited.

Time Period vs. Mulching Requirements for Revegetation of Construction Sites

Time Period Suitability Mulch Material Rate/Acre March 1-April 15 or August 1-October 1

Best seeding periods Small grain straw 1 or hay 2

2 tons straw or 3 tons hay

April 15-August 1 High Risk Moisture stress likely

Small grain straw 1 2 ½ tons

October 1-Dec. 1 Do not seed Freeze damage to young seedlings

Dec. 1-March 1 Good seeding period.

Dormant seeding.

Small grain straw 1 2 ½ tons

1 Small grain straw shall consist of wheat, oat, or rye straw.

2 Hay shall consist of grass or grass-legume plants utilized for livestock forage.

(9) Seeded areas shall be watered within two days after seeding and mulching operations are completed and subsequently during the establishment period. Seeded areas on which growth has started shall be watered to a minimum depth of three (3) inches to assure continued growth. Watering shall be done in

Beaver Creek Dam 6-6 a manner that will provide uniform coverage that will not cause erosion due to application of excess quantities and will not damage finished surfaces by the watering equipment.

(10) No separate payment will be made for Seeding and Mulching. Compensation for this item will be included in the payment for Bid Item 17, Spreading Topsoil, Construction Specification 26 - Topsoiling.

(210-VI-NEH, January 2009) 7–1

Construction Specification 7—Construction Surveys

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

2. Equipment and material Equipment for construction surveys shall be of a quality and condition to provide the required accuracy.

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

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

3. Quality of work All work shall follow recognized professional practice and the standards of the industry unless otherwise specified in section 9 of this specification. The work shall be performed to the accuracy and detail appropriate for the type of job. Notes, sketches, and other data shall be complete, recorded neatly, legible, reproducible and organized to facilitate ease in review and allow reproduction of copies for job documentation. Survey equipment that requires little or no manual recording of field data shall have survey information documented as outlined in section 9 of this specification.

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

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

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

0.01 foot. Differential leveling and transit traverses shall be of such precision that the error of vertical closure in feet shall not exceed plus or minus 0.1 times the square root of the traverse distance in miles.

Linear measurements shall be accurate to within 1 foot in 5,000 feet, unless otherwise specified in section 9 of this specification. The angular error of closure for transit traverses shall not exceed 1 minute times the square root of the number of angles turned.

The minimum requirements for placing slope stakes shall be at 100-foot stations for tangents, as little as 25 feet for sharp curves, breaks in the original ground surface and at any other intermediate stations necessary to ensure accurate location for construction layout and measurement. Slope stakes and cross sections shall be perpendicular to the centerline. Significant breaks in grade shall be determined for cross sections. Distances shall be measured horizontally and recorded to the nearest 0.1 foot. Side shots for interim construction stakes may be taken with a hand level.

(210-VI-NEH, January 2009) 7–2

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

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

4. Primary control

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

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

5. Construction surveys

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

Method 1—Contractor performed surveys shall include:

• checking and any supplemental or interim staking

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

• other surveys as described in section 9 of this specification

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

• establishing line and grade for all work

• setting slope stakes for all work

• checking and any supplemental or interim staking

• establishing final grade stakes

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

• other surveys as described in section 9 of this specification

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

• establishing line and grade for all work

• setting slope stakes for all work

• checking and any supplemental or interim staking

• establishing final grade stakes

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

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

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

(210-VI-NEH, January 2009) 7–3

6. Staking

The construction staking required for the item shall be completed before work on any item starts.

Construction staking shall be completed as follows or as otherwise specified in section 9 of this specification:

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

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

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

7. Records

All survey data shall be recorded in fully identified standard hard-bound engineering survey field notebooks with consecutively numbered pages. All field notes and printed data shall include the purpose or description of the work, the date the work was performed, weather data, sketches, and the personnel who performed and checked the work. Electronically generated survey data and computations shall be bound, page numbered, and cross referenced in a bound field notebook containing the index for all survey activities. All work shall follow recognized professional practice.

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

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

8. Payment

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

Method 2—For items of work for which lump sum prices are established in the contract, payment is made as the work proceeds with progress payment amounts determined as a percentage of the total work

(210-VI-NEH, January 2009) 7–4 planned as projected from the contractor's approved construction schedule. Payment of the lump sum contract price will constitute full compensation for completion of all work under this bid item.

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

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

12/7/2020 5:03 PM

Beaver Creek Dam 7-5

9. Items of work and construction details

Items of work to be performed in…