HYLTON Portal Project SPECS Final_Signed.pdf

SPECIAL CONDITIONS AND TECHNICAL SPECIFICATIONS

FOR

HYLTON PORTALS PROJECT

Located off SR753 @ 6819 CEDAR CROFT RD.

WISE, VA

WISE COUNTY, VIRGINIA

PREPARED BY:

COMMONWEALTH OF VIRGINIA

DEPARTMENT OF ENERGY

MINED LAND REPURPOSING

ABANDONED MINE LAND SECTION

February 23, 2024

Table of Contents

SPECIAL CONDITIONS

TECHNICAL SPECIFICATIONS

1. MOBILIZATION

2. SITE PREPARATION

3. SILT FENCE / STRAW BALES

4. ACCESS ROAD

5. PUMPING

6. AGGREGATE

7. MINE PORTAL CLOSURES

8. DRAINAGE DITCHES

9. BACKFILL OF POND AREA

10. CMP REMOVAL & HDPE INSTALL / DEBRIS REMOVAL

11. REVEGETATION

12. SURVEYS

13. CLEAN UP AND REPAIR OF DAMAGE

14. SAFETY PRECAUTIONS

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 - 7) and Construction Specifications (Pages 8-27)

1.3 Construction Drawings (Sheets 1-4).

Section 2. DEFINITIONS

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

Section.

2.2 The word “Inspector” shall mean any personnel employed by or representing the Agency.

2.3 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.

2.4 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.

2.5 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.

2.6 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.

Section 3. SCOPE OF WORK

3.1 The work performed under the terms of this Specification consists of the removal of a hazardous water body, the permanent closure of multiple, inundated mine portals according to these plans and specifications, and the revegetation of all disturbed areas on the site known as HYLTON PORTALS Project for the Commonwealth of Virginia. It shall also include modifications to the drainage pattern to ensure adequate positive drainage in conjunction with existing drainage structures and downstream areas. The job site is located off SR 753 (Wheatley Rd.) along a private driveway, called Cedar Croft Drive, near the northeastern section of WISE, Virginia.

3.2 The intent of this Specification is to prescribe the complete work of the project. The specification permits and directs the work 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 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 90 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 erosion and sediment control measures, if necessary.

5.1.2 Install a short, temporary access road to reach the portals. The proposed length is very short and close to public road.

5.1.3 Replace the existing 18” CMP downstream of the portal area with TWO HDPE N-12 Dual Wall culverts.

5.1.4 Pump any standing water away from the portals through the one of the pipes under the nearby driveway.

5.1.5 Remove all trash, debris, abandoned items, and organic materials from the portal face-up (pond) area.

5.1.6 Close two, inundated open mine portals with stone backfill and install one wet seal pipe with design end treatments.

5.1.7 Install one designed rock ditch to receive drainage from the wet seal portal with a riser pipe.

5.1.8 Install all designed drainage ditches flowing to the newly installed HDPEs under the adjacent driveway as necessary to carry surface runoff outside the limits of disturbance.

5.1.9 Remove the temporary access road and revegetate all disturbed areas.

5.1.10 Remove all temporary erosion and sediment control measures.

5.1.11 Schedule / notify the agency of any and all CRITICAL phases of work for verification and documentation.

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 to complete the work in the agreed upon time. 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 coal mine roofs.

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

http://www.missutilityofvirginia.com/

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.

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 10% 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 all quality control, clearing, grubbing, site access, and general site preparation work on all areas within the Limits of Disturbance as directed by the Project Inspector / Project Manager. Specifically, but not limited to, this work must include the removal and disposal of debris items (tires, appliances, organics, etc.) within the pond and portal footprint.

2.B PROCEDURE

Materials which are cleared, grubbed, stripped or otherwise included as part of this work may be disposed on-site and off-site at the landfill. Do not leave any windrows of brush. Material disposed on-site shall be evenly and neatly distributed as approved by the Project Inspector.

Any trees with 4” or larger diameter needing removal shall be cut into 2-feet segments and given to the property owner for firewood. The Project Inspector will specify the exact disposal location of the firewood.

2.C MEASUREMENT AND PAYMENT

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

2.C.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, such as disposal fees, necessary to complete the work.

3. SILT FENCE / STRAW BALES

3.A SCOPE

This item shall consist of furnishing, maintaining, and removing temporary silt fence as directed by the Inspector. Straw bales shall be strategically placed upstream at pipe inlets to prevent blockage of drainage structures. Silt fence and straw bale barriers shall be maintained as necessary to prevent siltation from entering the stream.

3.B MATERIALS

3.B.i Silt Fence:

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

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.

3.B.ii Straw Bales-Barrier:

As needed, and appointed by the Project Inspector / Project Manager, straw bale-barriers shall be installed at critical drain ways during construction to aid the Silt Fence filter fabric (Terra Tex SD-F made by Hanes Geo Components, or equivalent); see the DETAILS drawing sheet of the plans for exact layout. Standard square straw bales (approximately 18”x14”x36”) shall be either wire-bound or string tied. Wooden stakes (2”x2”x36”) or standard “T” or “U” steel posts shall be used to anchor.

3.C INSTALLATION

Silt fence shall be placed at all necessary locations to prevent erosion and as approved by the 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.

Straw bales shall be placed at strategic inlet points to prevent the closure of drainage structures or used as an “in-stream” barrier to flowing sediment.

3.D MAINTENANCE

Silt fences shall maintain functionality in sound condition and accumulations of silt removed each day. Following the usefulness of each structure, it shall be removed. Straw bales-barriers shall be replaced as needed due to bale deterioration to prevent the closure of drainage structures.

3.E MEASUREMENT AND PAYMENT

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

3.E.ii Payment: Payment for SILT FENCE shall be based upon the Linear Feet accepted and approved of each item 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.

3.E.iii Measurement: STRAW BALES shall be measured on an EACH bale basis for the number of bales actually installed, maintained, removed, and accepted by the Agency.

3.E.iv Payment: Payment for STRAW BALES shall be based upon EACH bale accepted and approved of each item 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.

4. ACCESS ROAD

4.A SCOPE

This item shall consist of all necessary grading of the slope to create an ACCESS ROAD approximately sixteen (16) feet in width to gain access to the seam mine bench within the ponded area from the adjacent driveway. It shall include the temporary placement of stone for establishing temporary construction access to the areas of the mine portals according to the location and details on the Drawings and Specifications. Any resurfacing of existing roads used as access (or otherwise impacted) shall be accommodated as well and payment shall be per Section 6 – AGGREGATE.

4.B MATERIAL

4.B.i VDOT Class 1 Riprap as specified in Section 204 and 414 of the VDOT Road and Bridge Specifications. See SECTION 6 - AGGREGATE for information regarding the aggregate to be used as temporary access materials.

4.B.ii VDOT #57 as specified in Section 205 of the VDOT Road and Bridge Specifications. See SECTION 6 - AGGREGATE for information regarding the aggregate to be used as temporary access under the Access Road.

4.C PROCEDURE

To leave the existing road surface, carefully place material to establish access to the portal area. If ponding occurs, the removed CMP from SECTION 10 – CMP REPLACEMENT can be used as a drainage culvert in the low area. Install the temporary access road to the mine bench with minimal disturbance, as necessary. Also, remove any forest litter and trash from the area in the pathway of the proposed roadbed. Place the layers of stone and grade the area as smooth as possible into the adjacent ground while promoting positive drainage away from the roadbed. Upon completion of portal closure activities, remove all stone, blend into adjacent areas and revegetate all disturbed area in accordance with SECTION 11 –

REVEGETATION.

4.D MEASUREMENT AND PAYMENT

4.D.i Measurement: Measurement for ACCESS ROAD shall be on a per job basis for all work accepted and approved by the Agency.

4.D.ii Payment: Payment for ACCESS ROAD shall be based upon the Lump Sum amount 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 all VDOT #57 aggregate used shall be included in SECTION 6 - AGGREGATE.

Payment for the necessary revegetation of the disturbed area associated with the ACCESS ROAD shall be covered by the acreage listed in Section 11 REVEGETATION.

5. PUMPING

5.A SCOPE

This item shall consist of the PUMPING of any ponded water that is immediately in front of the inundated mine portals, if necessary. Due to the abandonment of the mine, neither the depth nor volume of water is certain; during infrequent seasons of drought, the water is completely absent. However, great care should be taken to monitor the drawdown of the pool and continual pumping may be necessary during construction of the proposed portal closures and vertical wet seal / ventilation pipe installation. Since the work involves the draining of a flooded mine, the water shall be tested to determine if it needs to be treated before being released into the receiving stream. The mine water shall be tested for pH, iron, and manganese. If the pH is below 6.0, the iron above 6.0 ppm, or the manganese above 4.0 ppm, the water must be treated. The treatment plan shall be a temporary requirement for the volume of water that is impounded in the mine works. When the project work is completed or the mine is drained, the treatment structures shall be removed. The general treatment plan shall contain the adjustment of pH to within the range of 6.0 to 9.0 and a settling basin to collect the precipitant.

5.B PROCEDURE

The portals shall be prepared for closure by cleaning up the site, removing any soil, rock, and clearing debris that may have fallen in front of the portals. Rock falls and debris within the portal shall only be removed to the extent necessary to install pipes and as required to install the closures. Material that is blocking the intentional flow of water from the mine shall be removed. It is envisioned that this will be accomplished by means of a backhoe, or similar equipment, reaching into the opening and pulling out the material. Personnel shall not be allowed under the hanging roof of the mine to perform any work.

The clean-up shall remove material from rib to rib and as far out in front to install the closure and allow drainage from the mine via the proposed wet seals.

Construction of the mine portal closures is to be conducted in a safe manner using proper equipment for the work being performed. Spotters will be used to control work such that all material is prevented from rolling, slipping, or sliding down slope. Also, it is anticipated that there is a maximum of two (2) portals; one portal shall receive a modified wet seal, with a varmint guard, to allow release of hydrostatic pressure, if necessary. See Section 7.B.iii for wet seal information.

The PUMPING shall commence as soon as the Project Inspector grants permission, and the access road has been completed for access to the portals. The Contractor shall work as quickly and safely as possible to minimize the number of total days the portals are rendered open and to minimize availability for access from persons or wildlife.

5.C MEASUREMENT AND PAYMENT:

5.C.i Measurement: The PUMPING shall be on a per job basis for all incidentals and time, labor, and equipment necessary to complete the removal of water from the portal area.

5.C.ii Payment: The payment for PUMPING shall be on a LUMP SUM basis. Payment as specified shall be full compensation for all labor, materials, equipment and incidentals required to complete the work (removal of ponded water at portals). The final lump sum fee of the PUMPING is subject to approval of the Project Inspector / Project Manager and the line item in the bid schedule as it represents the maximum allowable dollar amount published at the time of this contract.

6. AGGREGATE

6.A SCOPE

This item shall consist of the preparation, haulage, and placement of aggregate stone on the site for access as well as for closure of the portals, blending to armor ditches, and road surfacing as needed.

6.B MATERIAL

6.B.i VDOT No. 57 Stone as specified in Section 203 of the VDOT Road and Bridge Specifications shall be used as access road bedding. See SECTION 2 – SITE PREPARATION.

6.B.ii VDOT No. 21B Stone as specified in Section 208 of the VDOT Road and Bridge Specifications shall be used as access road bedding. See SECTION 2 & SECTION 4.

6.B.iii VDOT Gabion Stone as specified in Section 204 of the VDOT Road and Bridge Specifications shall be used as fill material to close the mine portal and blended as necessary in ditches. See SECTION 7 – MINE PORTAL CLOSURES.

6.B.iv VDOT Class 1 Riprap as specified in Section 204 and 414 of the VDOT Road and Bridge Specifications shall be used for the construction of access road and to close the mine portals. See SECTION 7 – MINE PORTAL

CLOSURES.

6.C PROCEDURE

6.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.

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

6.D MEASUREMENT AND PAYMENT

6.D.i Measurement: Measurement for AGGREGATE shall be on a per TONS 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.

6.D.ii Payment: Payment for the four types of AGGREGATE shall be on a TONS 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.

7. MINE PORTAL CLOSURES

7.A SCOPE

This specification covers the construction activities, equipment, and accessories necessary to safely, and properly, close all mine portals within the project area as per the Drawings and Specifications. See the Mine Closures typical details and wet seal information on Drawing Sheet #4. Due to the periodic inundation of the portals, the exact quantity is unknown but based on old works-mapping, 2 (two) portals are suspected to exist.

7.B MATERIALS

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

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

7.B.iii Wet Seal: to be included in the cost to seal the portals

a) A Wet Seal is proposed in one of the portals AND is subject to be located in the field-determined lowest elevation of the two in the set of coal mine-entries.

b) The wet seal shall utilize at least a 6” SDR11 pipe installed projecting into the portal at the bottom in the lowest of the mine portals within the set / group. Reference the typical wet seal drawing on Sheet 4.

c) For mine drainage, a 6-inch diameter 6” SDR11 pipe with dimensions necessary to extend 1-foot beyond where the stone is pushed inside the mine and extended 1 foot beyond the toe of the stone on the outside of the opening and be approximately 6 inches off the floor of the mine. Typically, the amount of fill material and the angle of the slopes dictates that a minimum of at least a 20’-joint of PVC pipe be used for the wet seal drain. Finally, the pipe must be installed with elbows, angles, extensions to project to the surface drain.

7.C PROCEDURE

7.C.i The Contractor shall plan and conduct the work in and around portals in a safe manner taking PRECAUTIONS to provide for the testing for methane, carbon monoxide (black damp) or oxygen. If a collapsed portal is to be day-lighted, particular attention shall be given to the danger of bad air flowing from the mine. One portal, unless otherwise directed by the Project Inspector, shall be equipped with drain pipes to allow water discharge in the lowest portal.

Because the work potentially involves the draining of a flooded mine, the water shall be tested to determine if it needs to be treated before being released into the receiving stream. The mine water shall be tested for pH, iron and manganese. If the pH is below 6.0, the iron above 6.0 ppm or the manganese above 4.0 ppm, the water must be treated.

The treatment plan shall be a temporary requirement for the volume of water that is impounded in the mine works.

When the project work is completed or the mine is drained, the treatment structures shall be removed. The general treatment plan shall contain the adjustment of pH to within the range of 6.0 to 9.0 and a settling basin to collect the precipitant.

The portals shall be prepared for closure by cleaning up the site. Soil, rock, and debris that have fallen in front of the portal shall be removed. Rock falls and debris within the portal shall only be removed to the extent necessary to install pipes and as required to install the closures. Material that is blocking the flow of water from the mine shall be removed.

It is envisioned that this will be accomplished by means of a backhoe reaching into the opening and pulling out the material. Personnel shall not be under the roof of the mine to perform any work. The clean-up shall remove material from rib to rib and as far out in front to install the closure and allow drainage from the mine.

Construction of the mine portal closures is to be conducted in a safe manner using proper equipment for the work being performed. Spotters will be used to control work such that all material is prevented from rolling, slipping, or sliding down slope.

7.C.ii Portal Closure: Gabion Backfill

To minimize wasted stone tumbling into the mine opening Class 1 Riprap will be placed to act as a barricade for the gabion stone backfill. Place riprap stones directly within the mine opening up to the mine roof.

Gabion rock shall be filled against the riprap barricade. Fill material is to be placed to maximum extent possible over the top of the opening with the material adjacent to the portal and sloped toward the mine bench at a stable angle. The fill material shall be placed in 2’ lifts and compacted as possible with the excavator due to limited room.

All material from excavation of the portal area shall be blended into the adjacent areas and revegetated. Slopes shall be stable and approved by the Project Inspector before seeding of the area.

Abrupt surface transitions, pockets, protrusions, windrows or undrained areas shall be eliminated, unless approved to be left by the Agency. Large stones or debris identified as detrimental to seeding shall be removed and disposed of as directed by the Inspector.

Pipe shall be installed in one of the gabion portal closures to facilitate drainage (see 7.B.iii Wet Seals). Prior to closure, the Contractor shall install the pipe(s) as designated and in the manner shown on the Drawings, unless otherwise directed by the Agency. Substitution of pipe shall require approval from the Agency prior to use.

Typically, 20 linear feet-joints of 6-inch diameter SDR-11 pipe is used for drains installed near the bottom of the entry beneath the stone. Note: the 90-degree elbow flanges used for coupling the SDR-11 pipe shall be mechanically fused for a permanent connection.

Prior to construction of portal closures, the Contractor shall identify to the Inspector, the location(s) for temporary storage of Materials, if the closures cannot be constructed the same day the Materials are delivered. The Contractor shall secure approval from the Agency prior to storage of the materials if not stored immediately adjacent to the opening.

All areas disturbed by this work shall be revegetated in accordance with the SECTION 11 – REVEGETATION.

7.D MEASUREMENT AND PAYMENT

7.D.i Measurement: Measurement for MINE PORTAL CLOSURE shall be per Each closure installed and accepted by the

Agency.

7.D.ii Payment: Payment for MINE PORTAL CLOSURE shall be based upon the Unit Price per closure listed on the Bid

Schedule for each type of closure and the number of closures actually installed and accepted. Payment as specified shall be full compensation for all labor, equipment, designated materials (pipes, metal, etc.) and all incidentals necessary to complete the work. Payment for the AGGREGATE used in the portal closures shall be included in SECTION 6 – 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.

8. DRAINAGE DITCHES

8.A SCOPE

This item shall consist of all work and materials necessary to create, shape, and completely armor the proposed channels. It involves the excavation and forming of surface material to the required grade for construction of the designed ditches RL1 (rock lined), RL2, and GL1 (grass-lined) as shown on Sheet 3 of the plans. The combination of the three different-sized ditches will form the approximately 290 linear feet of channel in the area formerly ponded along the existing coal-mine portals. It will also include placement, compacting, and final grading of various aggregates and existing materials as described in the plans, and as directed by the Project Inspector, to ensure proper drainage to eliminate the hazardous water body. Preparation and compaction of the foundation is necessary to provide a uniform surface area for final placement of the either rock or vegetative liners as specified. Finally, one ditch shall be formed from the discharge spout of the wet seal to the intersection with GL1. This ditch does not require a minimum design and is only required to provide a non-erodible surface treatment on the slope of the backfill immediately beneath the pipe to the grass-lined ditch.

8.B PROCEDURE

The construction of the channel GL1 will begin at the most upstream point in the project limits to capture flows from existing RL2. The existing drainage structures will only require armoring as shown. The construction of the three designed channels, Ditches RL1 (100 l.f.), RL2 (10 l.f.), and GL1 (180 l.f.), shall replace the function of the reclaimed pond to direct flows to the newly installed HDPE pipes under the adjacent driveway.

RL1 and RL2 are EXISTING ditches which only need cleanout and minor shaping / grading to receive rock to prevent erosion. Ditch GL1, to be installed from the toe of the eastern pond bank, shall consist of a curved triangular ditch formed to capture runoff and the slope of the newly formed portal backfills. The GL1-ditch shall terminate at the sump installed at the inlet of the newly installed 18-inch HDPE road culverts. GL1 shall be a triangular-shaped ditch utilizing northern side slopes, ranging from a minimum of 3:1 to a maximum of 5:1 to blend into the existing ground and southern side slopes of 2:1 to match backfill grade.

8.C MATERIAL

8.C.i Ditch RL1 (rock-lined): VDOT #57 Stone and VDOT Gabion stone shall be used, when necessary, for backfill and armoring of deep gullies as well as the sump proposed for this work. It shall also be used to provide erosion control at the inlet of the 18”-HDPE under the driveway. The stone shall conform to stone as specified in the VDOT specifications for Coarse Aggregate found in Section 203 & 204 of the VDOT Road and Bridge Specifications. See SECTION 6 - AGGREGATE for payment for materials used to armor the existing ditch.

8.C.ii Ditch RL2 (rock-lined): 4. VDOT Class 1 Stone and VDOT Gabion stone shall be used, when necessary, for backfill and armoring of deep gullies at the existing discharges upslope at the edge of the yard / sidewalk. The stone shall conform to stone as specified in the VDOT specifications for Coarse Aggregate found in Section 203 & 204 of the VDOT Road and Bridge Specifications. See SECTION 6 - AGGREGATE for payment for materials used to armor the existing ditch.

8.C.iii Ditch GL1 (grass-lined): Grass mixtures appropriate for water flow and covered in SECTION 11-

REVEGETATION shall be used to line this low-velocity, gradual sloping ditch from the discharge of RL2 to the downstream encounter of sump at the newly installed HDPE culverts. See SECTION 11 - REVEGETATION for specifications and payment of seeding used to line this proposed ditch.

8.D MEASUREMENT AND PAYMENT

8.D.i Measurement: Measurement for the various VDOT aggregates (Gabion, Class 1 RR, #21b, and #1 Stones) shall be on a per ton basis according to the unit price on the bid schedule. Weight tickets shall be submitted to the Project

Inspector 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. See Section 6 AGGREGATE for payment.

8.D.ii Measurement: Measurement for the three ditches, RL1, RL2, and GL1, will be on a linear foot basis of complete grading, forming and compacting of the foundations of the ditches or armored with aggregate for erosion control. It shall be on a per LINEAR FOOT basis for all ditches fully armored or installed and approved by the Agency. See the linear foot unit price listed in the Bid Schedule.

8.D.iii Payment: Payment for VDOT aggregates shall be the result of the unit price entered on the Bid Schedule for each ton of respective stone received, tons of stone installed, and accepted by the Agency. Payment as specified shall constitute full compensation for all labor, materials, equipment, and incidentals necessary to complete the work.

Tickets shall include the net stone weight, the name of the project, date, and type of aggregate used. See Section 6 AGGREGATE for payment.

8.D.iv Payment: Payment for the three ditches, RL1, RL2, and GL1, will be on a linear foot basis of completed ditches lined with Cable Concrete, anchors included, installed and accepted by the Agency. Payment as specified shall constitute full compensation for all labor, materials, equipment, and incidentals necessary to complete the work.

9. BACKFILL OF POND AREA

9.A SCOPE

Work under this item consists of the haulage and placement of suitable fill material*, approved by the Project Inspector /

Manager, to the limits determined by the required grade (1-2%), backfilling the entire highwall, and construction of designed ditches as shown on the drawings. The contractor shall evaluate the minimum volume of material needed, approximately 2,500 cubic yards, to eliminate the hazardous water body AND bring the elevations up to, but not greater than:

1) the inlet elevation of the newly installed HDPE culvert pipes,

2) the toe of the slope established to provide drainage of the modified wet seal, and

3) the outlet of existing ditch, RL2, at the eastern end of the former pond location.

*Suitable fill material may, in some instances, include layers of aggregate if deemed necessary and only the material readily available in the vicinity of the project and most suitable for the compaction and backfill of the pond to eliminate the hazardous water. Suitable material to be approved by the Project Inspector.

9.A.i CLASSIFICATION

All backfilling and regrade under this specification shall be classified as “common”. Materials to be placed will consist of only approved, suitable fill materials inspected and approved by the Project Inspector or Project Manager before placement.

No heavily saturated earth, sediment, coal refuse, loose or “trashy” materials with debris or organics shall be allowed in the fill area.

9.B PROCEDURE

9.B.i Material Removal: Material shall be excavated from the pond area to be segregated and stored for use as topsoil after subgrade elevations involving aggregate and approved backfill placement are complete. All finished grading shall be pleasing in appearance with smooth grades sloped in accordance with the plan drawings as well as free of any protruding rocks or large debris as approved by Project Inspector.

9.B.ii Material Disposal:

Lifts: The Contractor shall place the material in level, horizontal lifts, extending over the entire area being filled. During construction, the top surface of the fill area shall be sloped with a grade of not less than 1-2%, in order that the fill may freely drain toward the pipes. Sediment control shall be placed around the area as needed to protect streams and or drainage ways or structures but also as directed by the Project Inspector.

The thickness of the layers before compaction shall not be more than 4 feet. No material placed in the area by dumping in piles or windrows shall be incorporated in a layer in that position but shall instead be moved and spread by blading or similar approved methods. All finished grading shall be pleasing in appearance with smooth grades and sloped in accordance with the Construction Drawings. The best available soil material shall be applied as the last lift.

9.B.iii Compaction: the compaction methods must be utilized if approved by the Inspector.

Temporary Drainage Control: The Contractor shall construct and maintain all necessary temporary channels, diversions, pipes or other means required to pursue backfill operations and work in a timely manner per methods approved and in agreement with SECTION 3 SILT FENCE / STRAW BALES. 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 except what is already covered under the Access Road Section and bid item.

9.C ACCESS ROADS

9.C.i Existing Roads: Maintain all existing roads used as access to the project site(s) in a condition passable to residents, construction vehicles and equipment at all times. The Contractor must provide access for residents affected by any temporary road closing. The Project Inspector must approve all temporary road closings. Any roads that are not remaining as part of the project proposal shall be removed or cross-barred and seeded. Cedar Croft Road is a permanent driveway as shown on the Site Map. Any permanent roads not pointed out on the plans may be designated as such by the Project Manager or Project Inspector.

9.C.ii Temporary Roads: All temporary roads necessary for haul roads from the disturbed areas to the disposal areas shall be constructed following approval from the Inspector. Prior to beginning of temporary road construction*, the Contractor shall walk the proposed road alignment with the Inspector. During construction, the Contractor shall exercise measures to ensure that disturbance is held to a minimum. 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. No additional payment for construction of any temporary road shall be made, as this is considered incidental to this portion of the work, except what is already covered under the Access Road Section and bid item.

*See SECTION 4 for Access Road details, measurement, and payment.

9.D MEASUREMENT AND PAYMENT

9.D.i Measurement: Measurement for BACKFILL OF POND AREA shall be on a per job basis for the material removed, transported, and placed in accordance with the lines and grades shown on the Construction Drawings.

9.D.ii Payment: Payment for BACKFILL OF POND AREA shall be the Lump Sum price listed in the Bid Schedule. Payment as specified shall be full compensation for all labor, materials, equipment and incidentals necessary to complete the work.

10. CMP REMOVAL & HDPE INSTALL / DEBRIS REMOVAL

10.A SCOPE

This item shall consist of removing debris and sediment from the existing pond, storing the soil component, and replacing the existing 18-inch diameter CMP at the pond outlet with two NEW 18-inch diameter HDPE N-12 pipes. Cleanout the area upstream and any adjacent areas immediately downstream as necessary for flow; the existing CMP is located downstream of the main project site under the driveway for the Josey residence. This debris removal shall consist of ensuring positive drainage / stream flow through the proposed pipes. Finally, create a small sump at the inlet of the newly installed pipes for future sediment control. If necessary, the sump shall be lined with small aggregate determined by the Project Inspector. Any excess material generated by trenching or sump creation shall be placed within the backfill of the pond near the inlet end or stockpiled for use as topsoil.

10.B PROCEDURE

The existing 18-inch diameter CMP pipe shall be replaced by HDPE prior to any backfill, regrading, or disturbance activities.

The area shall be cleaned out and cleared of all sediment and current rock deposits currently blocking the water flow. All material removed from the pipe area shall be blended into the immediate adjacent areas, primarily on the top layer of graded slopes of the former pond location and revegetated. As the pipe is located nearby, the removal should not involve loading or hauling. The contractor should utilize the appropriately sized equipment and/or hand tools for the task and exercise caution when approaching depth of buried waterlines suspected to be within the trench area.

10.C MEASUREMENT AND PAYMENT

10.C.i Measurement: Measurement for CMP REPLACEMENT & HDPE INSTALL / DEBRIS REMOVAL shall be on a

LUMP SUM basis for all work accepted and approved by the Agency.

10.C.ii Payment: Payment for CMP REPLACEMENT & HDPE INSTALL / DEBRIS REMOVAL shall be based upon the LUMP SUM amount designated on the Bid Schedule. Payment as specified shall be full compensation for all labor, materials, equipment and incidentals necessary to complete the pipe replacement work.

11. REVEGETATION

11.A SCOPE

This item covers the furnishing of all labor, equipment, and material for preparing the seedbed, liming, fertilizing, tilling, seeding and mulching on the designated areas. Designated areas encompass all areas and access roads within the project limits. It is anticipated that the number of acres shall be less than 1 acre(s) or less but shall include the disturbed area associated with the access road of Section 4.

11.B CERTIFICATION

The Contractor shall certify that all seed, soil amendments and mulch to be used in vegetation operations meet the requirements of these specifications and governing authorities.

11.C MATERIALS

11.C.i Lime: Lime material shall be ground agricultural limestone and shall conform to the minimum Calcium Carbonate Equivalent (C.C.E.) guaranteed by the supplier and approved by the Project Inspector.

a) Application: Lime shall be applied as directed by the Project Inspector prior to final grading (tracking) for incorporation into the soil.

b) Lime Rate: Lime shall be spread at two…