Dotson Creek Road Landslide_Revision Final_SPECS - signed.pdf

SPECIAL CONDITIONS AND TECHNICAL SPECIFICATIONS

FOR

DOTSON CREEK ROAD LANDSLIDE PROJECT

WISE COUNTY, VIRGINIA

PREPARED BY:

COMMONWEALTH OF VIRGINIA

DEPARTMENT OF ENERGY

MINED LAND REPURPOSING

ABANDONED MINE LAND SECTION

May 29, 2024

Table of Contents

SPECIAL CONDITIONS

TECHNICAL SPECIFICATIONS

1. MOBILIZATION

2. SITE PREPARATION

3. AGGREGATE

4. SILT FENCE

5. STRAW BALE BARRIER

6. EXCAVATION

7. RIPRAP BUTTRESS

8. EROSION CONTROL BLANKET

9. RIPRAP BACKFILL

10. HYDRAULIC HAMMER

11. CULVERT

12. PRE-CAST ENDWALL

13. UNDERDRAIN

14. STONE-LINED DITCH

15. ASPHALT REPAIR

16. SURVEYS

17. REVEGETATION

18. TRAFFIC CONTROL

19. CLEAN UP AND REPAIR OF DAMAGE

20. QUALITY CONTROL

21. SAFETY PRECAUTIONS

22. FUGITIVE DUST CONTROL

APPENDIX A

SPECIAL CONDITIONS

Section 1.

All of the following parts considered as a whole shall comprise the complete specifications. They are complementary and anything called for by one and not the others shall be considered binding as though called for by all.

1.1 Bid Package (General Clauses, General Conditions, Notice and Instructions to Bidders, etc.).

1.2 Special Conditions (Pages 3 - 6) and Construction Specifications (Pages 7 – 35)

1.3 Construction Drawings (Sheets 1 - 13)

Section 2. DEFINITIONS

2.1 The word “Agency” shall mean the Commonwealth of Virginia, Department of Energy, Mined Land Repurposing.

2.2 Where the word “Contract” is used, it shall be understood to refer either to a purchase order placed by the Agency and accepted by the Contractor together with this specification and all other documents referred to in such purchase order; or to a formal contract executed by the Agency and the Contractor, together with this specification and other documents referred to in such formal contract.

2.3 The word “Contractor” means the person, firm, or corporation named as such in the contract and includes the plural number and the feminine gender when such are named in the contract as the Contractor.

2.4 The word “Subcontractor” means only those having a direct contract with the Contractor and it includes one who furnishes material worked to a special design but does not include one who merely furnishes material not so worked.

2.5 Where the word “Work” is used, it shall be understood to mean and include any and all labor, supervision, services, materials, machinery, equipment, tools, supplies and facilities called for by, and to complete, the Contract.

2.6 “Project Inspector” means a representative of the Agency and includes one who inspects the work and assesses compliance with the plans and specifications.

Section 3. SCOPE OF WORK

3.1 The work to be performed under the terms of this Specification consists of the reclamation of a landslide, directly under VA

Route 645, caused by drainage from a pre-law underground mine. Secondary work consists of disposal of all excess material, and revegetation where needed on the site known as DOTSON CREEK ROAD LANDSLIDE PROJECT in WISE COUNTY, Virginia, for the Commonwealth of Virginia.

3.2 The intent of this Specification is to prescribe the complete work to be performed. The specification is written to permit and direct the work to be conducted by the selected Contractor. If there are any contradictions between the Specifications and Drawings, the Contractor shall bring these facts to the attention of the Agency and obtain the Agency’s decision as to the true meaning and intention.

3.2.1 The Contractor remains responsible for timely identifying any conflicts as may be found to the attention of the agency.

3.2.2 In the absence of a formal written response from the agency, or in the event the Contractor fails to bring such to the attention of the agency, the Contractor is responsible to ensure compliance with the most stringent requirement.

Section 4. TIME SCHEDULE

4.1 The Work shall be executed with sufficient personnel, equipment and material to complete the work in a period of 45 calendar days.

Section 5. WORK BY CONTRACTOR

The Contractor shall:

5.1 Furnish all supervision, labor, materials, tools and equipment necessary to perform all work. The work shall consist principally of the following:

5.1.1 Install, maintain, and remove all temporary traffic control signs, barricades, and barriers.

5.1.2 Excavate loose and unstable material from the landslide; stabilize with riprap stone layers.

5.1.3 Haul/grade excavated material within the designated disposal area.

5.1.4 Grade/stabilize bank slope above Dotson Creek Road.

5.1.5 Maintain site drainage during and after construction.

5.1.6 Install and maintain erosion and sediment control through the project.

5.1.7 Revegetate all disturbed areas.

5.2 Be responsible for receiving, unloading, storing, protecting and handling all materials and equipment furnished by the Contractor or the Agency for the execution of all work under this Specification.

5.3 Be responsible for demurrage or claims incurred because of negligence in expediting the unloading of materials or equipment.

5.4 Replace any defective material furnished by the Contractor or any defective work performed by the Contractor’s forces at the

Contractor’s own expense.

5.5 Furnish to the Agency for approval before start of work, a Schedule of Work and procedure for construction of the work covered by the contract.

5.6 Be responsible for scheduling, expediting, directing, inspecting and coordinating the work so as to complete the work in the time agreed upon. The Contractor shall immediately notify the Agency of any impending problems, which could delay the completion of the work.

5.7 Before starting the work, contact the Agency for proper clearance and be governed by the Agency’s instructions.

5.8 Be responsible for locating, relocating and protecting from damage existing underground and overhead utilities when such utilities are clearly visible. Be responsible for verifying the location of all utilities, pipes, etc. before initiating the work.

5.9 Confine all workers to the construction area.

5.10 Provide drinking water and containers.

5.11 Provide watchmen, safety barricades, lights, signs and other items necessary for layout and installation of the work.

5.12 Furnish all labor, stakes, templates and tools and perform all field surveying and engineering to establish construction quantities and the lines and grades necessary for layout and installation of the work.

5.13 Be completely familiar with the location and accessibility of various construction and storage sites to determine the best material and equipment handling methods for the orderly completion of the work.

5.14 Have on the work site during construction a competent superintendent, duly authorized to represent and act for the Contractor in all matters pertaining to the work covered by this Specification.

5.15 Not perform any additional or temporary work for the Agency’s account unless on specified written orders, signed by the

Agency’s authorized representative and Contractor and only in the amounts of the various types of work specified in said orders.

5.16 Work in close cooperation with the Agency and others engaged in the project so that the work will be completed with dispatch and in an orderly manner.

5.17 Continuously maintain adequate weather and fire protection of the Contractor’s work from damage and shall protect property from damage or loss arising in connection with this contract. The Contractor shall make good any such damage or loss.

5.18 Comply with the provisions of the “Occupational Safety and Health Act of 1970, Public Law 91-596”, 29 CFR and 30 CFR;

and the Safety Codes Commission of the Commonwealth of Virginia, issued by the Department of Labor and Industry under

Title 40.1 of the Code of Virginia (1950), as amended. The Contractor shall be held liable to the Agency for any health and/or safety infractions, on the Contractor’s part, which cause the Agency or surface owner to receive a citation and/or fine from any local, state or federal agency. Actual costs involved will require satisfaction, by the Contractor, to the Agency or surface owner.

5.19 Maintain the site of work in an orderly manner. The Contractor shall provide personnel and supervision to continuously clean up the construction area under this jurisdiction. Should the Contractor refuse or fail to clean up or remove debris when requested by the Agency, it is understood that the Agency may employ others to do this work, and without further authority withhold the cost thereof from any payment due the Contractor.

5.20 Dispose of all debris and waste resulting from work at a disposal site approved by the Agency. The Contractor shall comply with all Department of Environmental Quality requirements concerning the use, handling, and disposal of petroleum products, working in or near streams and wetlands, burning or releasing emissions into the air, and disposal of solid waste and hazardous or toxic waste. The Contractor shall not put or spill any materials into any drainage system that would pollute area streams or waterways. The Contractor shall be liable for any pollution caused directly or indirectly by the Contractor’s employees or those of any subcontractors.

5.21 Furnish all special apparatus, welding machines, air compressors, hoisting equipment, tools, implements, cartage, scaffolding, ladders, planks, acetylene gas, oxygen gas, expendable materials, temporary light and heat, construction materials, shims, and all other materials that may be required for the proper completion of the work.

5.22 Furnish electrical power, gas, compressed air, and any other utilities required for use during construction. The Contractor shall remove all temporary wiring, switches, lights, piping, and connections to service facilities used during construction.

Such connections shall not be made without approval of the Agency.

5.23 Provide temporary supports as may be required during construction including those necessary to ensure the stability of the proposed excavation or working under mine roofs.

5.24 Not be permitted to drive any crawler type equipment or rollers on any paved roads except on rubber tire floats or similar vehicles. The Contractor shall protect pavement when it is necessary to move such type equipment across any paved roadway.

5.25 Not be permitted to keep within buildings or structures any stock of gasoline, kerosene, diesel fuel or similar flammable material. Any such flammables shall be stored in areas arranged by the Contractor, in a manner approved by the Agency and in compliance with the Department of Environmental Quality’s AST Regulations.

5.26 Be responsible for shoring as required to prevent damage to any adjacent structures, utilities or property.

5.27 Repair to the satisfaction of the Agency, at the Contractor’s own expense, any damage to adjacent structures, utilities or property.

5.28 Allow and provide the Agency access to the work for inspection whenever it is in preparation or progress, and provide proper facilities for such access and inspection.

5.29 The drawings and specifications illustrate the general character and scope of the work. Any additional detail and other information deemed necessary by the Agency will be furnished to the Contractor when and as required by the work.

5.30 Where the word “similar” appears on the drawings, it shall be interpreted in its general sense and not as meaning identical, and all details shall be worked out in relation to their location and their connection with other parts of the work.

5.31 The specifications are divided into several parts for convenience only, since the entire specifications must be considered as a whole. The divisions of the specifications are not intended to control the Contractor in dividing the work among subcontractors or to limit the work performed by any trade. The Contractor shall be responsible for the coordination of the trades, subcontractors, and venders engaged upon this work.

5.32 The Contractor shall verify measurements or dimensions shown on the drawings at the site. Where there are discrepancies, the Agency shall be consulted.

5.33 The Contractor shall maintain at the site one copy of all drawings, specifications, addenda, change orders and other modifications, in good order and marked to record all changes made during construction.

5.34 Before performing any excavation, contact Miss Utility, (800) 810-7197, to confirm the location of any below ground utility lines in the work area. The affected utility companies will mark the location of the underground lines within 48 hours after being notified. If the work is to continue more than 15 days, they will return to remark the utility lines as requested. Further details about the Miss Utility program and its requirements are available at the website www.missutilityofvirginia.com.

5.35 The Contractor shall comply with all regulations governing storm water discharges from construction activities. The contractor shall implement an erosion and sediment control plan throughout the duration of construction activities.

5.36 The Contractor shall certify that all materials meet the requirements of these specifications and governing authorities.

5.37 The Contractor shall comply with permits issued by the Army Corps of Engineers and any other permits required to complete construction for this project.

Section 6. WORK BY AGENCY

The Agency will:

6.1 Furnish the site in an “as is” condition.

6.2 Provide limited area, not necessarily adjacent to the site, for storage purposes and for the Contractor’s offices, change houses, sanitary stations, and tool and storage sheds. The Contractor shall make and maintain access to the facilities.

6.3 Furnish all design and detail drawings necessary to complete the specified work. One set of Plans and Specifications will be sold to interested bidders. Additional sets of Plans and Specifications will be issued to the selected Contractor as needed.

6.4 Designate in the field the manner in which the work is to be performed, as conditions warrant, if not detailed in the Specifications or shown on the Drawings.

6.5 Inspect the work during its progress. No work will be considered completed until approved by the Agency.

6.6 Obtain right of entry.

http://www.missutilityofvirginia.com/

TECHNICAL SPECIFICATIONS

FOR

1. MOBILIZATION

1.A SCOPE

This item shall consist of the mobilization and demobilization of the Contractor’s forces and equipment necessary for performing the work required to complete the Contract.

1.B PROCEDURE

1.B.i It shall include the purchase of contract bonds (if applicable), eVA fees, insurance, transportation of personnel, equipment and operating supplies to the site, and other preparatory work at the site. It shall also include making necessary repairs to any access roads.

1.B.ii It shall not include mobilization for any specific item of work for which payment for mobilization is provided elsewhere in the Contract.

1.B.iii This item covers mobilization for work required by the Contract at the time of award. If additional mobilization costs are incurred during performance of the contract as a result of changed 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 items of work changed or added.

1.C MEASUREMENT AND PAYMENT

1.C.i Measurement: Measurement for MOBILIZATION shall be Lump Sum for the job as shown in the project Scope of

Work.

1.C.ii Payment: Total payment for MOBILIZATION shall not exceed 5% of the Base Bid amount. Exceeding this limit may be basis for rejection of the bid as non-responsive. The Base Bid amount shall be the total of all sub-items on the Bid Schedule, less the amount for Mobilization.

Payment for MOBILIZATION shall be the Lump Sum amount listed on the Bid Schedule and shall constitute full compensation for all labor, equipment, materials and incidentals necessary to complete the work.

Payment for MOBILIZATION shall be made on the basis of 50% of the Lump Sum amount on the first invoice submitted and the remaining 50% on the final invoice.

2. SITE PREPARATION

2.A SCOPE

This item shall include quality control, all clearing, grubbing, site access, and general site preparation work on any areas affected by the project. The work shall consist of the grubbing and disposal of trees, tree stumps, brush, snags, logs, and debris as directed by the Project Inspector.

2.B MATERIAL

2.B.i Coarse Aggregate: VDOT No. 57 Stone as specified in Section 203 of the VDOT Road and Bridge Specifications to be used as needed for road bedding material to transport equipment and material to access the project site.

2.B.ii Coarse Base Aggregate: VDOT No. 1 Stone as specified in Section 203 of the VDOT Road and Bridge Specifications to be used as needed for road bedding material to transport equipment and material to access the project site.

2.C CLEARING/ GRUB WORK

Remove all materials that are cleared, grubbed, stripped or otherwise included as part of this work from the site to an approved landfill. Site preparation shall be strictly limited to the areas shown on the drawings, unless otherwise directed by the Project Inspector. The Contractor shall incorporate any adjacent areas reasonably necessary to perform the work when directed to do so by the Project Inspector.

2.D ACCESS ROADS

2.D.i Alignment: The Drawings show the approximate routes of the construction access roads (existing and proposed). In general, these routes have been chosen over existing trails or alignments that normally display good drainage. These routes have also been selected to minimize the length of road that must be constructed. Care must be exercised to avoid disturbance to the historically, archeologically or environmentally significant features associated with the site;

these include old roadbeds, spoil piles, building foundations, rubble, structures, mounds and wetlands.

During access road construction, the Contractor shall select the route that results in the removal of the fewest trees possible. No trees larger than 12 inches in diameter shall be damaged or cut without permission from the Agency.

All access road routes must be walked with the Project Inspector prior to construction and trees that must be removed shall be flagged prior to the walk.

2.D.ii Construction: Access roads shall be graded to remove humps, ridges and holes and shall be ditched to convey storm runoff away from roads. At locations where a road crosses a drainage swale, coarse aggregate base material shall be used to stabilize the soft area. Temporary culvert pipe (Culverts 2 and 4) shall be placed along the swale and covered with coarse aggregate to promote/maintain drainage and minimize erosion.

2.D.iii Maintenance: Access roads shall be maintained at all times during construction. Areas that show excessive rutting shall be graded and additional stone shall be placed as directed by the Project Inspector. Roads shall be maintained to prevent excessive amounts of mud and debris from being picked up by construction vehicles and deposited on surrounding public streets. Alternate clean coarse aggregate sizes may be used at the discretion of the Project Inspector to grade and maintain access routes based on unforeseen circumstances.

2.E MEASUREMENT AND PAYMENT

2.E.i Measurement: Measurement for SITE PREPARATION shall be on a per job basis for all work accepted and approved by the Agency.

2.E.ii Payment: SITE PREPARATION shall be based upon the Lump Sum amount on the Bid Schedule. Payment as specified shall be full compensation for all labor, materials, equipment and incidentals necessary to complete the work. Payment for the AGGREGATE used in the SITE PREPARATION shall be included in Spec No. 3 – AGGREGATE and the actual quantity accepted and approved by the Agency. Payment for the AGGREGATE shall be full compensation for all material necessary to complete the work.

3. AGGREGATE

3.A SCOPE

This item shall consist of the preparation, haulage, and placement of aggregate stone on the site.

3.B MATERIAL

3.B.i VDOT Class I Riprap as specified in Section 204 & 414 of the VDOT Road and Bridge Specifications.

3.B.ii VDOT Class A1 Riprap as specified in Section 204 and 414 of the VDOT Road and Bridge Specifications.

3.B.iii VDOT Gabion Stone as specified in Section 204 of the VDOT Road and Bridge Specifications.

3.B.iv VDOT No. 1 Stone as specified in Section 203 of the VDOT Road and Bridge Specifications.

3.B.v VDOT No. 57 Stone as specified in Section 203 of the VDOT Road and Bridge Specifications.

3.B.vi VDOT No. 21B Stone as specified in Section 208 of the VDOT Road and Bridge Specifications.

3.B.vii VDOT No. 26 Crusher Run as specified in Section 205 of the VDOT Road and Bridge Specifications.

3.C PROCEDURE

3.C.i Aggregate shall be transported and handled to prevent dirt and debris from entering the stone; and to prevent spalling and breakage of the stone.

3.C.ii Aggregate shall be placed according to Construction Drawings and as directed by the Project Inspector.

3.D MEASUREMENT AND PAYMENT

3.D.i Measurement: Measurement for AGGREGATE shall be on a per Ton basis for the type and amount of aggregate delivered and installed. Weight tickets shall be submitted as documentation for payment. Tickets shall include the total weight of the truck empty and loaded and the net stone weight, the name of the project, date, and type of stone.

3.D.ii Payment: Payment for AGGREGATE shall be on a Unit Cost basis for the type and amount of aggregate delivered and accepted by the Agency and the Unit Price listed on the Bid Schedule. Payment shall be full compensation for all labor, equipment, materials and incidentals required to perform the work.

4. SILT FENCE

4.A SCOPE

This item shall consist of furnishing, maintaining, and removing temporary silt fence as directed by the Project Inspector around the work area. Silt fence shall be maintained as necessary to prevent siltation from entering the streams.

4.B MATERIALS

All constituent elements of the silt fence shall conform to the notes and dimensions as shown on the Drawings.

4.B.i Silt Fence filter fabric shall be Terra Tex SD-F made by Hanes Geo Components or equivalent, and shall be specifically recommended for this purpose by the manufacturer and shall meet or exceed the following specifications:

U.V. Resistance (ASTM D-4355) 80% Grab Tensile (ASTM D-4632) 125 lbs Permittivity (ASTM D-4491) 0.1 sec-1 Flow Rate (ASTM D-4491) 8 gpm/ft2

4.B.ii Silt Fence posts shall be either timber stakes (2” x 2” min.) or pressed steel stakes set plumb and to sufficient depth to provide a sound anchor for the supporting wire fence and/or filter fabric.

4.C PROCEDURE

Silt Fence shall be placed at all necessary locations specified on the Construction Drawing and as approved by the Project Inspector. Vertical wood posts shall be protected by means of a metal cap or other device to prevent damage when hammers are used to drive the posts into the ground.

4.D MAINTENANCE

Silt fences shall be maintained in a functionally sound condition and accumulations of silt shall be promptly removed each day.

Following the usefulness of each structure, it shall be removed and disposed of in an approved location.

4.E MEASUREMENT AND PAYMENT

4.E.i Measurement: SILT FENCE shall be measured on a Linear Foot basis for the length of sediment control actually installed, maintained and removed.

4.E.ii Payment: Payment for SILT FENCE shall be based upon the Linear Feet accepted and approved by the Agency and the Unit Price listed in the Bid Schedule. Payment as specified shall be full compensation for all labor, materials, equipment and incidentals required to install, maintain and remove the items specified.

5. STRAW BALE BARRIER

5.A SCOPE

This item shall consist of furnishing, maintaining and removing temporary straw bale barriers as detailed on the Construction Drawings, and as directed by the Inspector around the work area. Straw bale barrier shall be maintained as necessary to prevent erosion from the project site.

5.B MATERIALS

5.B.i Standard square straw bales (approximately 18”x14”x36”) shall be either wire bound or string tied.

5.B.ii Wooden stakes (2”x2”x36”) or standard “T” or “U” steel posts shall be used to anchor down the bales.

5.C INSTALLATION

Straw bale barrier shall be placed according to the details and locations specified on the Construction drawings, and at any locations directed by the Project Inspector. Straw bales shall be installed so that bindings are oriented around the sides rather than along the tops and bottoms of the bales in order to prevent deterioration of the bindings. Vertical wood posts shall be protected by means of a metal cap or other device to prevent damage when hammers are used to drive the posts into the ground.

5.D MAINTENANCE

Straw bales shall be inspected immediately after each rainfall and at least daily during prolonged rainfall. Sediment deposits should be removed after each rainfall. They must be removed when the level of deposition reaches approximately one-half the height of the barrier. Necessary repairs to barriers or replacement bales shall be accomplished promptly.

5.E MEASUREMENT AND PAYMENT

5.E.i Measurement: STRAW BALE BARRIER shall be measured on a Linear Foot basis for the length of sediment control actually installed, maintained, removed, and accepted by the Agency.

5.E.ii Payment: Payment for STRAW BALE BARRIER shall be based upon the Linear Feet accepted and approved by the Agency and the Unit Price listed in the Bid Schedule for each pay item. Payment as specified shall be full compensation for all labor, materials, equipment, and incidentals required to install, maintain and remove the items specified.

6. EXCAVATION

6.A SCOPE

Work under this item consists of the excavation of loose, unstable material from the slide area, hauling, and grading of said material on the designated disposal area.

6.B MATERIAL

6.B.i VDOT Class I Riprap as specified in Section 204 & 414 of the VDOT Road and Bridge Specifications.

6.B.ii Temporary Drainpipes: 8” & 18” diameter corrugated, double-wall, flexible high-density polyethylene (HDPE) pipes meeting ASTM F2648 specification. An example being ADS N-12® WT IB PIPE or equivalent.

6.C CLASSIFICATION

6.C.i Excavation under this specification shall be classified as “common”. Materials to be removed will consist of loose earth, sediment, coal refuse, loose and fragmented sandstone material (variable in size), soft or disintegrated shales, and similar materials.

6.D PROCEDURE

6.D.i Preparatory Work: Slopes shall be cleared and grubbed of all vegetation and organic matter to allow removal of loose and unstable material. See Section 2 – Site Preparation for further details.

6.D.ii Material Removal: Material shall be removed down in the slide area to solid rock or residual soil, removing all loose and unstable material within the slide area to the satisfaction of the Agency. The excavation cut shall have a average slope of 1H:1V. Stair step the cut line 5’H:5’V (average) to maximize stability of the stone backfill.

Excavated material may be stockpiled upon approval of the Project Inspector, if such stockpiling is necessary to the coordination of work, or the material is too wet to permit proper disposal. Excavated material that is removed will be hauled and disposed of at the area designated by the Agency.

6.D.iii Material Disposal: The Contractor shall place the material in level, horizontal lifts, extending over the entire area being filled.

During construction, the top surface of the disposal area shall be sloped with a grade of not less than 2%, in order that the fill may freely drain toward the slopes. Sediment control shall be placed around the toe of the slopes.

The thickness of the layers before compaction shall not be more than 2 feet. No material placed in the fill area by dumping in piles or windrows shall be incorporated in a layer in that position, but shall be moved and spread by blading or similar approved methods.

All finished grading shall be pleasing in appearance with smooth grades and no abrupt changes or surface irregularities. All completed surfaces shall be tracked or otherwise roughened in preparation for revegetation.

Material placed in the Primary Disposal Area shall be graded to allow for continued use as hay and pasture land with no large rocks projecting out from the finished surface. Final surface grade shall be approved by the Project Inspector.

Each lift of material shall be compacted with at least 4 passes of a dozer that exhibits a minimum ground pressure of 9 psi. Approved equipment includes Caterpillar Model D-6D (maximum track width of 18”) and Model D-7G (maximum track width of 22”). Other compaction methods may be utilized if approved by the Project Inspector.

6.D.iv Temporary Drainage Control: The Contractor shall construct and maintain all necessary temporary channels, diversions, pipes or other means required to pursue excavation and work in a timely manner. The Contractor shall not constrict natural drainage nor impound water on the project unless specifically required by the Drawings and/or Specifications or approved by the Agency. This shall be considered incidental to this portion of the work, with no additional compensation to the Contractor.

6.E ACCESS ROADS

6.E.i Existing Roads: Maintain all existing roads used as access to the project site(s) in a condition passable to land owners, construction vehicles, and equipment at all times.

6.E.ii Temporary Roads: All temporary roads necessary for haul roads from the slide areas to the disposal areas shall be constructed following approval from the Project Inspector. Prior to beginning of temporary road construction, the Contractor shall walk the proposed road alignment with the Project Inspector. During construction, the Contractor shall exercise measures to ensure that disturbance is held to a minimum. Cut material shall not be cast over the hill and allowed to slide downhill, but shall be tracked repeatedly with a dozer to form a firm, stable bench. Any roads that are not remaining as part of the post mining land use shall be cross-barred and seeded. No separate payment for construction of any temporary road shall be made, as this is considered incidental to the work.

6.F MEASUREMENT AND PAYMENT

6.F.i Measurement: Measurement for EXCAVATION shall be on a cubic yard basis. Three surveys shall be performed to make an accurate measurement of the material removed from the slide area. During construction, yardage may be estimated using truck counts based upon a yardage per truck agreed to by the Contractor and Agency representative.

The 75% estimate shall be designated by the Project Inspector. Measurement for the yardage shall be in accordance with Section 16 – Surveys and will be based upon the yardage of material removed from the slide area. The Agency will not allow any estimates of cubic yards excavated once the total estimated amount becomes greater than 75% of the cubic yards on the bid schedule. The Contractor shall have a Professional Engineer calculate and send a certified engineering report showing the amount of material excavated with the Final Application of Payment. The Contractor shall deduct the estimated amounts paid prior to having the actual amount calculated by the final survey.

The calculated number can be used by the Contractor to submit an Application of Payment for that amount minus what was previously entered on prior Application of Payments. If the difference is negative, then the amount will be deducted from the final payment.

6.F.ii Payment: Payment for EXCAVATION shall be on a Unit Price basis for the cubic yards of material and the Unit Price listed on the Bid Schedule. Payment as specified shall constitute full compensation for all labor, materials, equipment and incidentals necessary to complete the work. Payment for Excavation will be considered complete upon submittal and review of the final surveying activities discussed in Section 16 - Surveys. Payment for all aggregate shall be included in Section 3 – Aggregate.

7. RIPRAP BUTTRESS

7.A SCOPE

This item covers placement and grading of riprap stone along the toe of the scarp area for supplemental stabilization of the slope. It includes the furnishing of all materials, labor and equipment needed to complete the item task.

7.B MATERIAL

7.B.i VDOT Class 1 Riprap as specified in Sections 204 and 414 of the VDOT Road and Bridge Specifications

7.C PROCEDURE

The RIPRAP BUTTRESS shall be placed at the discretion of and upon approval of the Agency based on field conditions and observed slope stability. The Contractor shall wait upon final approval from the Project Inspector before proceeding with RIPRAP BUTTRESS installation.

Slopes shall be cleared and grubbed of all vegetation and organic matter to allow removal of loose and unstable material. See Section 2 – Site Preparation for further details. Soil material shall be disposed of at the designated disposal area as directed by the Project Inspector. See Section 6.D.iii – Material Disposal for further details.

Riprap stone shall be placed to the grade(s) specified on the Construction Drawings. Riprap shall be placed in a manner that will produce a reasonably well-graded mass of rock with the minimum practicable percentage of voids. Riprap shall be placed to its full course thickness in one operation and in a manner to avoid displacing underlying material. Care should be exercised during stone placement to keep earth or sand from filling spaces between the stone. Larger stones shall be reasonably well distributed. Finished riprap shall be free from objectionable pockets of small stones and clusters of larger stones.

7.D MEASUREMENT AND PAYMENT

7.D.i Mesurement: RIPRAP BUTTRESS shall be measured on a per job basis for all the work accepted and approved by the Agency.

7.D.ii Payment: Payment for RIPRAP BUTTRESS shall be based upon the Lump Sum amount on the Bid Schedule.

Payment as specified shall be full compensation for all labor, materials, equipment and incidentals necessary to complete the work. Payment for all aggregate shall be included in Section 3 – Aggregate.

8. EROSION CONTROL BLANKET

8.A SCOPE

This item shall consist of the stabilization of the labeled scarp area by grading and installing Erosion Control Blanket according to specifications and as recommended by the manufacturer.

8.B MATERIALS

8.B.i Erosion Control Blanket as specified in Section 244.02.(l) [Rolled Erosion Control Products] of the VDOT Road and Bridge Specifications. Product shall meet or exceed the specifications of EC-2, Type 3. An example being American Excelsior Company® AEC Premier Coconut™ erosion control blankets or equivalent.

VDOT Road and Bridge Specs – Section 244

TABLE II-22C

Rolled Erosion Control Products (Std. EC-2) Property Type 1 Type 2 Type 3 Type 4 Test Method

Typical functional longevity1 (months) 12 12 24 36 N/A Typical tensile strength2 (lbs/ft) 50 75 100 125 ASTM D 4595

Maximum “C” Factor3 0.15 at 3V:1H

0.20 at 2H:1V

0.25 at 1.5H:1V

0.25 at 1H:1V

ASTM D6459 or other qualified independent test6

Minimum permissible shear stress4, 5 (lbs/ft2)

1.50 1.75 2.00 2.25 ASTM D6460 or other qualified independent test6

1 Obtain max “C” factor and allowable shear stress for mulch control nettings with the netting used in conjunction with pre-applied mulch material.

1 Functional longevities are for guidance only. Actual functional ongevities may vary based on site and climatic conditions 2 Minimum average roll values, machine direction.

3 ”C” factor calculated as ratio of soil loss from rolled erosion control product protected slope (tested at specified or greater gradient, v:h) to ratio of soil loss from unprotected (control) plot in large-scale testing. These performance test values should be supported by periodic bench scale testing under similar test conditions and failure criteria using Erosion Control Technology Council (ECTC) Test Method #2).

4 Minimum shear stress the rolled erosion control product (unvegetated) can sustain without physical damage or excess erosion (> 1/2-inch soil loss) during a 30-minute flow event in large-scale testing. These performance test values should be supported by periodic bench scale testing under similar test conditions and failure criteria using ECTC Test Method #3.

5 The permissible shear stress levels established for each performance category are based on historical experience with products characterized by Manning’s roughness coefficients in the range of 0.01 to 0.05.

6 Other large scale test methods determined acceptable by the Department.

8.C PREPARATION

Slopes to be stabilized shall be cleared and grubbed of all vegetation and organic matter to allow removal of loose and unstable material. See Section 2 – Site Preparation for further details.

Shape and grade the slope as directed and approved by the Project Inspector. Prepare a friable seedbed relatively free from clods and rocks more than 1 1 inches in diameter and any foreign material that will prevent uniform contact of the protective covering with the soil surface. Lime, fertilize, and seed in accordance with Spec No. 17 – Revegetation before laying the blanket.1

8.D PROCEDURE

Start laying the protective covering from the top of slope and unroll down-grade. Allow to lay loosely on soil - do not stretch.

Upslope ends of the protective covering should be buried in a anchor slot no less than 6-inches deep. Insert material in the trench according to the manufacture’s recommendations. Tamp earth firmly over the material.1

Staple the material at a minimum of every 12 inches across the top end. Edges of the material shall be stapled every 2.5 feet.

Where multiple widths are laid side by side, the adjacent edges shall be overlapped a minimum of 2 inches and stapled together. Staples shall be placed down the center, staggered with the edges at 2.5-foot intervals.1

At the point at which the material is discontinued, or at which time the protective covering meets a structure of some type, fold 4 inches of the material underneath and staple every 12 inches (max).1

1. Virginia Erosion and Sediment Control Handbook

8.E MEASUREMENT AND PAYMENT

8.E.i Measurement: EROSION CONTROL BLANKET shall be measured on a SQUARE YARD basis for the area of blanket actually installed, accepted, and approved by the Agency.

8.E.ii Payment: Payment for EROSION CONTROL BLANKET shall be based upon the Square Yards installed and the Unit Price listed in the Bid Schedule. Payment as specified shall be full compensation for all labor, materials, equipment and incidentals required to install the items specified.

9. RIPRAP BACKFILL

9.A SCOPE

This item covers the remediation of the landslide feature by the placement and grading of riprap stone and coarse aggregate in the excavated slide area. It includes the furnishing of all materials, labor and equipment needed to complete the item task.

9.B MATERIAL

9.B.i VDOT Class 1 Riprap as specified in Sections 204 and 414 of the VDOT Road and Bridge Specifications

9.B.ii VDOT Class A1 Riprap as specified in Sections 204 and 414 of the VDOT Road and Bridge Specifications

9.B.iii VDOT No. 1 Stone as specified in Section 203 of the VDOT Road and Bridge Specifications

9.B.iv Geotextile Fabric for use as Riprap Bedding Material as specified in Section 245.03(b) of the VDOT Road and Bridge

Specifications. Product shall comply with the following requirements:

Test Value Comment Apparent Opening Size, ASTM 4751 0.60 mm Max average roll value

Ultraviolet Stability (retained strength), ASTM 4355

50% After 500 hr of UV exposure

Grab Strength, ASTM D 4632 250 lb @ < 50% Elongation 150 lb @ ≥ 50% Elongation

Puncture Strength, ASTM D 6241 500 lb @ < 50% Elongation 300 lb @ ≥ 50% Elongation

An example product meeting the above requirements is US 250 Woven Geotextile, US Fabrics Inc.

9.C PROCEDURE

9.C.i Prep Work: Remove any remaining loose material and/or debris from the excavated cut face/foundation. Grade the cut foundation to drain toward the Underdrain pipe. Install geotextile fabric along the foundation and 5 feet up the sides.

9.C.ii Backfill: Riprap/coarse stone layers shall be placed to the grade(s) and thickness specified on the Construction Drawings. Stone shall be placed in a manner that will produce a reasonably well-graded mass of rock with the minimum practicable percentage of voids. Stone shall be placed to its full course thickness in one operation and in a manner to avoid displacing underlying material. Care should be exercised during stone placement to keep earth or sand from filling spaces between the stone. Larger stones shall be reasonably well distributed. Finished stone shall be free from objectionable pockets of small stones and clusters of larger stones.

Stone lifts shall be interlocked with at least 4 passes of tracked construction equipment. Approved equipment includes Caterpillar Model D-6D dozer (maximum track width of 18”) or Model 320B excavator (maximum track width of 24”). Other methods may be utilized if approved by the Project Inspector.

Onsite solid rock that is busted from HYDRAULIC HAMMER operation during EXCAVATION may be used as Class 1 or Class A1 riprap fill upon approval and at the discretion of the Project Inspector. Onsite stone shall be of equivalent size and quality of the specified riprap stone.

9.D MEASUREMENT AND PAYMENT

9.D.i Mesurement: RIPRAP BACKFILL shall be measured on a per job basis for all the work accepted and approved by the Agency.

9.D.ii Payment: Payment for RIPRAP BACKFILL shall be based upon the Lump Sum amount on the Bid Schedule.

Payment as specified shall be full compensation for all labor, materials, equipment and incidentals necessary to complete the work. Payment for all aggregate shall be included in Section 3 – Aggregate. No material payment shall be made for onsite riprap used in any application on the project.

10. HYDRAULIC HAMMER

10.A SCOPE

This item covers the furnishing of all labor, equipment, and material used for the operation of the hydraulic hammer used to break up any solid rock or oversized stone removed during EXCAVATION.

10.B EQUIPMENT

10.B.i Medium to heavy duty Hydraulic Hammer used for breaking up of oversized material. Hammer shall meet or exceed the following specifications:

Impact Energy (ft-lbf) Maximum Operating Pressure (psi)

Blows per minute Oil Flow Rate:

Min/Max (gal/min)

3000-4000 2150 - 2200 300-500 20/55

CAT H120S hammer is an example product that meets these specifications.

10.C PROCEDURE

Hydraulic Hammer shall be used to supplement EXCAVATION to achieve final grade and shape of the cut line as shown in the Cross Sections of the Construction Drawings. Operate the hammer using a carrier machine capable of maximizing the performance capabilities of the hammer at the direction and discretion of the Project Inspector.

10.D MEASUREMENT AND PAYMENT

10.D.i Measurement: Measurement for HYDRAULIC HAMMER shall be on a per HOUR basis for the hours of operation of all work accepted and approved by the Agency.

10.D.ii Payment: Payment for HYDRAULIC HAMMER shall be on a Unit Cost basis for the actual time of work performed and the Unit Price listed on the Bid Schedule. Payment shall be full compensation for all labor, equipment, materials and incidentals required to perform the work.

11. CULVERT

11.A SCOPE

This item covers the furnishing of all labor, equipment, and material for installation of permanent culvert pipes as shown on the Drawings.

11.B MATERIALS

11.B.i VDOT No. 21B Stone as specified in Section 203 of the VDOT Road and Bridge Specifications.

11.B.ii VDOT Class I Riprap as specified in Section 204 & 414 of the VDOT Road and Bridge Specifications.

11.B.iii Bell & Spigot Drainpipe: The culverts shall be 12” and 18” diameter corrugated, double-wall, flexible high-density polyethylene (HDPE) pipe meeting ASTM F2648 specification. An example being ADS N-12® WT IB PIPE or equivalent.

11.B.iv Plain End Drainpipe: The culvert shall be 36” diameter corrugated, double-wall, flexible high-density polyethylene (HDPE) pipe meeting ASTM F2306 specification. An example being ADS N-12® PLAIN END PIPE or equivalent.

11.C PROCEDURE

11.C.i Trench excavation for CULVERT shall be completed to a sufficient length and width to allow for forms, bracing and supports, if necessary to prevent sidewall collapse. The Contractor shall furnish and place such supports, should they be required by subsurface conditions, depth, inclement weather, etc., and subsequently remove such support material. Excavation beyond the required lines and grades shall be corrected at the Contractor’s expense by filling any resulting voids with compacted soil or compacted VDOT No. 26 stone (crusher run).

Excavate the trench according the Detail Construction Drawings, removing the existing culverts identified in the Construction Drawings in the process. Existing culverts shall be disposed of at an approved landfill. Following excavation of the trench, the trench bottom shall be hand worked to a smooth and even surface, free of depressions or high spots, with a uniform gradient conforming to the notations on the Drawings. Spread and compact a minimum 3” layer of VDOT No. 21B stone along the bottom of the trench. Lay the HDPE pipe along the stone layer.

Bell and Spigot pipe segments shall be connected with the “bell” on the upslope end of the pipe. Plain end pipe shall be connected with coupling bands covering at least two full corrugations on each end of the pipe. All fittings and/or couplings shall conform to ASTM 2306 standard specification.

Fill and compact the excavated soil back into the trench. Armor culvert outlet with riprap stone as specified in Construction Drawings. See Construction Drawings, Sheet 12, Culvert Schedule for details. Revegetate any disturbed ground as specified in Section 17 – Revegetation.

11.D MEASUREMENT AND PAYMENT

11.D.i Measurement: Measurement for CULVERT shall be on the basis of linear foot of the trench bottom where drain pipe is installed and accepted by the Agency.

11.D.ii Payment: CULVERT shall be on a Unit Cost basis for the actual length and pipe size installed along the trench bottom and the Unit Price listed on the Bid Schedule. Payment shall be full compensation for all labor, equipment, materials, and incidentals required to perform the work. Payment for all aggregate shall be included in Section 3

– AGGREGATE.

12. PRE-CAST ENDWALL

12.A SCOPE

This item shall consist of providing materials and labor necessary for the installation of pre-cast concrete headwalls.

12.B MATERIAL

12.B.i Precast Endwall for pipe culverts as specified in Section 3021 of the VDOT Road and Bridge Specifications, and as detailed in Section 101.02 of the VDOT Road and Bridge Standards.

12.B.ii VDOT No. 26 Crusher Run as specified in Section 205 of the VDOT Road and Bridge Specifications.

12.B.iii VDOT No. 57 Stone as specified in Section 203 of the VDOT Road and Bridge Specifications.

12.B.iv Hydraulic Cement Mortar as specified in Section 218 of the VDOT Road and Bridge Specifications.

12.C PROCEDURE

Conduct general soil exploration of the foundation directly below placement of the endwall. Exploration shall extend to a depth equal to ½ inch per foot of fill height or 8 inches, whichever is greater. The Contractor shall report the findings of the foundation exploration to Virginia Energy and VDOT for approval to proceed with structure placement. Unsuitable material shall be removed to the project disposal area and replaced.1

Bedding material shall be No. 26 Crusher Run aggregate except where standing or running water is present. If standing or running water is present, bedding material shall be aggregate No. 57 to a depth as directed by the Project Inspector with a 4-inch cap of No. 26 aggregate. Bedding shall be lightly and uniformly compacted.

The invert of the inlet endwall shall be placed level with the ditch bottom, preventing any pooling or standing water. Attach culvert pipe to the Endwall using mortar as recommended by the manufacturer and detailed in Section 101.02 of the VDOT Road and Bridge Standards. Endwall shall be sized according to Standard Detail EW-1PC, PRECAST ENDWALL FOR PIPE CULVERTS, as detailed in the Construction Drawings.

12.D MAINTENANCE

If any drainage structure that the contractor has installed becomes damaged or clogged with sediment or debris during the span of the project, it shall be cleaned, repaired, or replaced by the contractor at no additional cost to the Agency.

12.E MEASUREMENT AND PAYMENT

12.E.i Measurement: PRE-CAST ENDWALL shall be measured per EACH installed and accepted by the Agency.

12.E.ii Payment: Payment for PRE-CAST ENDWALL shall be based upon the Unit Price listed on the Bid Schedule and the actual quantity installed and accepted. Payment shall be full compensation for all labor, equipment, materials, and incidentals required to perform the work. Payment for all aggregate shall be included in Section 3 –

AGGREGATE.

13. UNDERDRAIN

13.A SCOPE

This item shall consist of providing materials and labor necessary for the installation of underdrain and conducting necessary quality assurance measures to ensure positive drainage toward the resident stream as shown on the plan sheets.

13.B MATERIAL

13.B.i HDPE Pipe: Perforated 6” diameter corrugated, double-wall, flexible high-density polyethylene (HDPE) pipe.

The HDPE Pipe shall be high density polyethylene conforming with the minimum requirements of cell classification 424420C for 3- through 10-inch diameters, as defined and described in the latest version of ASTM D-3350, except that carbon black content should not exceed 4%. Fittings shall conform to AASHTO M252, AASHTO M294, or ASTM F2306. Bell and spigot connections shall utilize a spun-on or welded bell and valley or saddle gasket meeting the soil-tight joint performance requirements of AASHTO M252, AASHTO M294 or ASTM F2306. An example for this specification is ADS N-12® ST IB perforated pipe.

13.B.ii VDOT No. 21B Stone as specified in Section 208 of the VDOT Road and Bridge Specifications.

13.B.iii VDOT No. 57 Stone as specified in Section 203 of the VDOT Road and Bridge Specifications.

13.C PROCEDURE

Trench excavation for the underdrain shall be completed to a sufficient length and width to allow for forms, bracing and supports, if necessary to prevent sidewall collapse.