4_faithspecs.pdf

UNITED STATES DEPARTMENT OF THE INTERIOR

OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT

Three Parkway Center Pittsburgh, Pennsylvania 15220

Faith Coal Company, 2283087 Reclamation Project

TN-17-004

Table of Contents

I. SCOPE OF PROJECT

General Information Project Locations Page 2 Proposed Work Page 2 Underground Utilities and Other Obstructions Page 2 Easements and Work Area Page 2 Safety Page 3

II. TECHNICAL SPECIFICATIONS (TS)

TS NO. 1.0 MOBILIZATION Page 3

TS NO. 2.0 DEMOBILIZATION Page 3

TS NO. 3.0 SITE PREPARATION Page 4

TS NO. 4.0 POND DEWATERING AND TREATMENT Page 7

TS NO. 5.0 WATER DIVERSION Page 8

TS NO. 6.0 MATERIAL EXCAVATION, REGRADING AND TREATMENT BASIN Page 8

TS NO. 7.0 DRAINAGE CONTROLS Page 11

TS NO. 8.0 MINE OPENING AND SHAFT CLOSURE Page 13

TS NO. 9.0 REVEGETATION Page14

TS NO. 10.0 TREE PLANTING Page17

TECHNICAL SPECIFICATIONS

FAITH COAL COMPANY 2283087 PROJECT

PROJECT NUMBER: TN-17-004

SEQUATCHIE COUNTY, TENNESSEE

I. SCOPE OF PROJECT

General Information:

Project Locations:

This project site consists of an underground mine that is discharging low PH off-site into a nearby stream. In addition, settlement of backfill around the one of two backfilled openings has exposed a small opening that would allow a person to access the underground mine. Also, a depression exists near the slumped backfill that may have been an air shaft at one time. Finally, an existing sediment pond that is no longer used needs to be modified to drain water within it out and improve the outlet channel. The site was permitted by the Faith Coal Company to as an underground mine operation under Permit 2283087. It is located on the Daus Quadrangle at Latitude 350 17’ 56”N, Longitude 850 28’ 1.5”W.

Proposed Work:

The majority of the work to be performed under this contract consists of the following:

• The mobilization and demobilization of the contractor’s men, equipment and materials.

• Site preparation, including access road construction, clearing and grubbing and erosion and sediment control installation and maintenance.

• The removal of an existing sediment/treatment pond.

• The placement of drainage channels, excavation/grading and construction of a treatment basin.

• Grade and fill in partially open mine opening and shaft.

• The revegetation of all disturbed areas, including tree planting.

Underground Utilities and Other Obstructions

The Contractor shall locate any water, sewage, electric, gas or other utilities and shall take necessary measures to protect these utilities from any damage. The Contractor shall coordinate any utility relocation with the appropriate company, and such coordination shall be the responsibility of the Contractor. Any portion of a utility system damaged by the Contractor's failure to adequately protect them shall be replaced by the Contractor at no cost to the Office of Surface Mining and Enforcement (OSMRE). The toll free number to have utilities located is through the Tennessee One Call System at 811.

Easements and Work Area

The Contractor shall confine project operations to the properties for which the Office of Surface Mining Reclamation and Enforcement (OSMRE) has received written authorization for right-of-entry from the landowner(s). The Contractor shall consult the Contracting Officer’s Representative (COR) if he/she is uncertain about where access has been obtained. As an agent of OSMRE, the Contractor is forbidden to use other properties where OSMRE has not received written permission, and the Contractor shall be solely liable for its actions if he/she trespasses onto properties where consents for right-of-entry have not been obtained. During the course of the work, the site shall be neatly maintained and free of litter and other non-organic debris, with site cleanup performed daily.

Safety

The Contractor, subcontractors, and their employees shall abide by all safety rules applicable at the site of the work and shall comply with all Federal, State, OSHA, and municipal laws, ordinances, orders, codes, rules, regulations, etc. The Contractor shall furnish employees, including those of subcontractors, with MSHA approved safety equipment, devices, and enforce compliance in their use consistent with accepted practices and applicable rules. Specifically, HARD HATS AND STEEL- TIPPED SHOES shall be worn by all workmen, supervisors, inspectors, and visitors while on the project site.

II. SPECIFICATIONS

1.0 MOBILIZATION

1.1 Scope

The work shall consist of the mobilization of the Contractor's forces and materials necessary for performing the work required under the contract. It shall include transportation of personnel and operating supplies and equipment to each of the sites proposed for construction under this contract. The cost for all necessary bonds and insurance is included under this item.

Mobilization shall also consist of delivering to the site and assembling in working order all necessary equipment, materials, and supplies. Prior to the commencement of work, the Contractor's equipment shall be subject to approval of the COR. Equipment shall be maintained in first-class operating condition at all times. Mobilization shall include the storage of all materials and supplies

Finally, Mobilization will also include supplying drinking water, toilet facilities, trash-cans and other preparatory work at the site.

1.2 Measurement and Payment

Measurement and payment for Mobilization shall be at the lump sum amount indicated in the bid schedule. Mobilization shall not exceed 20% of the total bid price. Payment for Mobilization shall constitute full payment for work described herein and shall include the Mobilization required to complete the work as specified in all areas proposed for reclamation under this contract.

2.0 DEMOBILIZATION

2.1 Scope

This specification covers final cleanup, restoration, and demobilization from the reclamation site.

2.2 Site Clean-Up

The Contractor is expected to properly dispose of all trash, garbage and other objectionable materials on a daily basis. After all construction work is complete and prior to final payment, all disturbed areas shall be cleaned and left in a condition approved by the COR. All unused material shall be removed from the site or otherwise disposed of. Any bare areas shall be seeded and treated in accordance with the applicable specification.

2.3 Restoration

The project site area and other areas disturbed by the Contractor shall be returned to the preconstruction conditions by the Contractor at no expense to the OSMRE.

2.4 Demobilization

Demobilization shall consist of the removal of all equipment, materials, supplies, and incidentals from the work area. This work includes the daily cleanup and removal of all waste material generated by the Contractor's activities.

2.5 Measurement and Payment

Measurement and payment for Demobilization shall be at the lump sum amount indicated in the bid schedule. Such payment shall constitute full compensation for all work performed as described above. Demobilization shall not exceed 10% of the total bid price and shall include the demobilization required to complete the work as outlined at all the sites proposed for reclamation under this contract.

3.0 SITE PREPARATION and EROSION CONTROL

3.1 Scope

This work shall consist of clearing, grubbing, and/or stripping of vegetation necessary to perform the work specified, sediment control during the project and relocation (if needed) and protection of all utilities. Site preparation shall include the construction, maintenance and reclamation of access roads, remedial drainage measures, and the preparation of any area to receive fill.

Roadways requiring use by the contractor and which may have to be used by the public shall be left in a passable condition for a two-wheel drive vehicle at all times. Erosion/sediment control is also included under this item.

3.2 Site Access

General access to the proposed project site will be outlined at the pre-bid meeting. Any alternate access roads proposed by the contractor shall be approved by the COR before construction. All access roadways upgraded and/or constructed by the contractor shall be performed in a manner which will allow for safe, unobstructed passage by persons working at the site and to others which may require access to or through the site. At the completion of the project, all access roads shall be returned to its pre-construction condition or better. The access will be off Layman Road.

At the point of entry from the road towards the mine opening work area a temporary culvert may have to be placed as well as some road stone to insure that impact on the public road is minimal.

In addition a road will need to be placed to access the area of the pond.

At the completion of the work any access roads constructed/reopened by the contractor for the purpose of completing the work at the site shall be regraded and/or returned to the approximate original contour. Any temporary channel/ditch crossings shall be removed.

3.3 Temporary Drainage

This item includes any temporary drainage ditches or pumping facilities necessary to complete the work, or to divert water away from all work areas. All temporary ditches and other erosion and sediment control measures shall be maintained in serviceable condition until such time as they are no longer needed.

3.4 Temporary Mine Drainage Crossing

There is one possibly two crossings that are to be installed to access the mine opening area and to allow routing of the drainage from the mine to be temporarily moved until the proposed channel system and basin are in place. Stone used for construction of the crossing will be as described in Section 7.2.1 of these specifications. The contractor shall prepare a flat surface to place the pipe then surround the pipe with rock to two feet above the pipe’s crown. From there soil can then be placed to bring the crossing up to the grade needed. See detail on Plan Sheet D1. The pipe used for the crossings shall be a minimum of 24 inches in diameter and shall have full flow capacity. Once the crossing is no longer needed the pipe and stone shall be removed.

3.5 Sediment Control Measures

Sediment runoff shall be controlled by the placement of straw bales, sumps, rock checks, and or silt fences, at the time of construction. Wood Excelsior Wattles shall be placed on disturbed areas as needed after regrading work is completed. All sediment control structures shall be properly maintained during construction. If damaged, destroyed or if they become clogged with sediment, the selected sediment control shall be immediately repaired or replaced at the Contractor's expense. The contractor shall take any necessary steps to prevent erosion or silting of water courses at any time while completing any phase of this project

Straw Bales: Each straw bale shall be secured to the ground with a minimum of two (2) each, 2" x 2" x 4' wooden stakes driven a minimum of one foot into ground. Standard three (3) foot bales shall be overlapped a minimum of 6 inches and be embedded one foot into the ground.

Silt Fence: Silt fence shall be installed as per the manufacturer’s recommendations. At a minimum a six inch deep trench shall be dug where the fence is to be placed and the bottom 6 inches of the fabric will be buried in the trench. The trench shall then be backfilled and compacted. This is to insure surface water goes through the fence fabric and not around or under it.

Silt fence shall at a minimum meet the following parameters.

• Minimum 24 inch width

• 1-1/2" x 1-1/2" (Nominal) hardwood stakes

• Stakes spaced every 6' (6' centers)

• 11 stakes per 100' fabric

• Grab Tensile Strength- ASTM D-4632 = 125 lbs.

• Puncture – ASTM D-4833 = 60 pounds

• Flow Rate/ Permittivity- ASTM D-4491 = 30 gpm/sq.ft

All of the sediment control structures shall be properly maintained during construction. During the useful life of any silt check, each shall be maintained in sound condition and any silt accumulations that threaten the proper functioning of the checks shall be removed. The contractor shall take any necessary steps to prevent erosion or silting of water courses or the surrounding farm fields at any time while completing any phase of this project. After the usefulness of the silt check has ended, it shall be removed and disposed of and the accumulated silt either removed or dressed in place, as determined necessary by the COR, and the entire area seeded and protected. If any problems develop, the contractor shall be responsible to take immediate corrective action to insure installed sediment controls are properly functioning.

Rock Checks: Rock checks can be placed where needed within water courses. These checks as used for sediment control shall be comprised of Tennessee Class A-1 stone that will be three (3) feet high and three (3) feet wide at the top.

The maximum height of the checks shall be 3.0 feet and shall go completely across the water course where placed. The center of the check dam must be at least 6 inches lower than the outer edges. High flows must go over the center of the checks, not around the edges.

Wood Wattles: At the completion of the project, wood excelsior wattles shall be installed on the regraded slopes where designated by the COR.

Wood filled wattles shall be installed end to end and staked parallel to the contour (perpendicular to the direction of flow). The areas where they will be placed will be determined once regrading work is completed.

• The wattles must be placed in a trench dug in to a depth of 3 to 5 inches below existing ground and properly staked to prevent movement and floating during storm

• Wattles shall be secured to the ground by wooden stakes spaced every four lineal feet along the length of the wattle. Stakes shall be driven through the center of the wattle and into the ground a minimum of 10", with two- three inches projecting above the top of the wattle.

• A stake shall be placed within two feet of the end of each wattle. The installation process may be expedited by using a metal rod to create pilot holes for the wooden stakes.

When joining two wattles, tightly abut both ends or overlap the wattles approximately six inches. If wattles are joined together by abutting the ends, tie the ends together using twine or plastic locking ties. Ends of the wattles shall be turned up the slope, so as to retain water and prevent its release from the end of the wattle.

• Wattles shall be standard 12-inch diameter by 10/15 foot long machine curled wood excelsior wrapped in a tubular encasement of heavy duty biodegradable knitted netting.

3.6 Clearing and Grubbing/Garbage Removal

3.6.1 Tree and Brush Disposal

Prior to site disturbance trees that are not be cut down or removed will be flagged. This area is considered a potential bat habitat and certain trees could have endangered and threatened bats roosting in them during the day. Any tree that is marked that may have to be disturbed to accomplish work cannot be removed unless permission is granted by OSM. Any un-flagged trees, stumps, brush, roots or other organic materials shall be removed from excavation and fill areas and placed at an approved, on-site stockpile location.

All cleared material shall be disposed of in a manner as described below.

Windrowing: Areas used to windrow vegetative material shall be cleared to accommodate the windrow(s). Material shall be placed outside the cut and fill areas in neat compacted windrows laid approximately parallel with the toe line of the slopes. The top of the rows shall not extend higher than 6 feet. All material in the windrow shall be matted down with construction equipment to form a compact and uniform pile. Windrows shall have 20 foot minimum length breaks at least every 150 feet. Windrows shall not be placed against existing trees.

Piling and Burning: Cleared material can be piled and burned if a burning permit for forest areas is obtained from the Tennessee Department of Agriculture, Division of Forestry. (423-346- 6655) The Contractor shall also be responsible for determining and complying with local ordinances regarding burning materials. Piles shall be constructed so burning does not damage surrounding vegetation. Burning of the combustible material will not be permitted on or near coal refuse, mine portals or within close proximity to coal seams or utilities. If burning is incomplete, the remaining material shall be repiled and burned completely to ash.

3.6.2 Garbage Disposal

All mining and non-mining related items, whether currently exposed or exposed during construction, including metal and plastic piping, general garbage, tires, construction materials, heavy equipment, trash, concrete, building materials, etc., shall be completely removed from the site and disposed of at an approved, licensed landfill. Landfill tickets shall be required to indicate proof of proper disposal. The contractor is responsible for removing and disposing of all mining related materials that are uncovered prior to any backfilling work.

3.7 Measurement and Payment

3.7.1 Site Preparation- The method of measurement and basis on payment for Site Preparation shall be on a lump sum basis, as indicated by the bid schedule for Site Preparation and shall include full compensation for all items described within this section, including sediment control measures, and temporary crossings, except for the Wood Wattles. The total price shall not exceed 20% of the total bid amount.

3.7.2 Wood Wattles- The method of measurement and basis of payment for Wood Wattles shall be per linear foot, properly installed. Said linear foot price shall include full compensation for all materials and proper installation. Only wood wattles placed in approved, final regraded areas shall be considered for payment under this item.

3.7.3 Payment for any other required items outlined in this section shall be considered incidental to the contract.

4.0 POND DEWATERING AND WATER TREATMENT

4.1 Scope

This work consists of the dewatering of one existing sediment pond and associated water treatment in the manner outlined herein. Refer to Plan drawing S1 for approximate location of the Pond.

4.2 Materials

None specified.

4.3 Construction Methods

4.3.1 The existing sediment/treatment pond requiring controlled dewatering is shown on the plans. At a minimum, the contractor shall field test any discharge, provide treatment to any discharge that exceed the water parameters shown below. Field testing shall be completed by the contractor at the dewatering location every four hours. If at any time when the water quality exceeds parameters listed, siphoning and pumping shall be immediately suspended until such time as corrective measures are taken. Water treatment shall meet or exceed the following criteria:

PH 6.0-9.0

Total iron 1.0 mg/l maximum Total manganese 2.0 mg/l maximum Total suspended solids 70 mg/l maximum Testing rate (field) every 4 hours minimum

4.3.2 The contractor shall dewater the sediment pond by pumping/siphoning. No controlled breaching to dewater the pond will be allowed. Dewatering and adherence to water quality parameters and testing, as shown in Section 4.3.1, shall continue until the pond is dewatered and embankment regrading as shown on Plan Sheet X1 and channel installation is completed as described in Sections 5.0 and 6.0. If required by existing site conditions, pumping/siphoning may have to continue to keep the proposed fill areas free of water until proper material placement is completed. Dewatering and regrading operations shall be immediately suspended and corrective measures shall be implemented if at any time water quality parameters are exceeded.

4.3.3 Any on-site or off-site damages caused by improper dewatering shall be the sole responsibility of the contractor.

4.4 Measurement and Payment

4.4.1 Pond Dewatering and Water Treatment: The method of measurement and basis of payment for “Pond Dewatering and Water Treatment” shall be per the lump sum price bid, properly completed. Said lump sum price shall be considered full compensation for all labor, equipment, pumping, testing, treatment and materials necessary to complete the work.

4.4.2 Payment for any other required items outlined in this section shall be considered incidental to the contract.

5.0 WATER DIVERSION

5.1 Scope

Initial work will include construction of a dike/bypass system to route current drainage passing through the area around the proposed disturbance near the mine openings and proposed channels. Once the water diversion system is in place and working properly, excavation for the drainage channels and treatment basin placement shall commence.

5.2 Description of Work

Prior to any excavation activities the contractor shall set up a drainage by pass system that will route the drainage emanating from the mine around the planned construction areas. This can be accomplished with sand bag dikes, pumps, siphons, pipes or other method that will keep water temporarily away from the work areas.

The construction of the access road and the rerouting of water will need to be done in conjunction with each other. Sediment controls as described in Section 3.5 will be placed in areas within the system as needed to insure offsite impacts to the receiving stream is kept to a minimum.

5.3 Measurement and Payment

The method of measurement and basis of payment for “Water Diversion” shall be per the lump sum price bid, properly completed. Said lump sum price shall be considered full compensation for all labor, equipment, piping, sandbags, and other materials necessary to complete the work.

Payment for any other required items outlined in this section shall be considered incidental to the contract.

6.0 MATERIAL EXCAVATION, PLACEMENT AND TREATMENT BASIN CONSTRUCTION

6.1 Scope

This work consists of the general site grading; excavation; regrading the existing embankment at the pond; and construction of the treatment bed in the manner outlined herein and as shown on Plan Sheet Drawings S1, S2 and X1. The work in this section shall also include any associated diversion channel excavation outlined in Section 5.0, and areas outside the proposed fill areas to obtain proper drainage and to complete the final regrading of all disturbed areas in the manner outlined herein.

Excavation of proposed drainage channels shall be measured and paid for as described in Section 7.

6.2 Classification of Excavation and Fill

The excavation proposed in this section shall be unclassified. It is anticipated that the majority of material to be removed will consist of a mixture of loose, unconsolidated soil and rock; and coal spoil materials. Blasting will not be permitted on this project.

6.3 Materials

6.3.1 Filter Fabric: The filter fabric used to underlay the pond liner shall meet or exceed the following parameters:

Non-Woven Filter Fabric: Non-woven, Needle Punched, Geotextile used between the rock blanket drain and soil shall meet or exceed the following characteristics:

PROPERTIES TEST REQUIREMENT

Weight ASTM D5261 10 oz./Sq.

Grab Tensile Strength ASTM D-4632 250 lbs. Min.

Mullen Burst Strength ASTM D-3786 500 psi min.

Trapezoidal Tear Strength ASTM D-4533 100 lbs. Min.

Permeability ASTM D-4491 1.2/sec max.

CBR Puncture Resistance ASTM D-6241 700 lbs. Min.

6.3.2 Basin Liner: Shall be comprised of a minimum 45 mil thick synthetic rubber Ethylene

Propylene Diene Monomer (EPDM) liner equivalent to Firestone Pondgard that meets or exceed the following parameters.

6.3.3 Fill Material- Fill material shall consist of available, on-site soil and rock material free of vegetative matter, garbage, metal and plastic piping, construction materials, heavy equipment, trash, concrete, building materials and mining debris. The fill material shall be obtained from the existing excavation areas or other approved, on-site locations.

6.3.4 AASHTO No. 67 Stone: Shall be clean AASHTO No. 67 (1 inch minus) durable limestone. It shall meet the soundness requirements outlined in Section 709.03, TDOT 2015 Standard Specifications for Roads and Bridges.

6.4 Construction Methods

6.4.1 Before performing the work described in this section, all areas shall be cleared and grubbed in accordance with Section 3.6 and erosion and sediment control installed in accordance with Section 3.5.

6.4.2 The embankment associated with the existing pond shall be removed to within one foot

(1’) of the bottom elevation of the pond. It is estimated that the pond could be as much as 3-4 feet deep. Excavated material shall be placed in a configuration within the dewatered limits of the pond in a manner which will route any drainage toward the proposed outlets.

Fill material placed within the limits of the pond shall be placed in 24-inch lifts (2 Feet) and compacted with a minimum of four (4) passes of a D-6 dozer or equal.

6.4.3 During excavation, the contractor shall attempt to locate and remove any previously installed drainage structures. If these structures are located at a lower elevation than the approved final grade of the embankment, each structure shall be uncovered and removed.

Approved fill material shall be placed in the excavation area in eight-inch (8”) lifts, with each lifts

Property Test Method Minimum ASTM Performance Specific Gravity Unit Weight Thickness (min. ave.)

Break Strength Break Elongation Tear Resistance Puncture Resistance

ASTM D 792

ASTM D751

ASTM D5199

ASTM D882

ASTM D882

ASTM D1004

ASTM D4833

1.1 .28 .045 500% compacted with a minimum of three (3) passes of a “wacker” type ram or equal.

6.4.4 Material excavated for lowering the pond embankment, constructing the treatment basin shall be placed in level fill lifts, extending the entire width and length of the areas proposed to receive fill. Lift thicknesses are outlined in Section 6.4.2. Each lift shall be properly compacted before the next lift is placed. In-place material not meeting these specifications will be rejected and shall be removed and/or reworked as described in section 6.4.2.

If it is determined by the COR that compaction requirements are not being followed as described above, the Contractor shall be required to conduct in-place compaction tests to determine if 90% standard proctor is being achieved. The Contractor shall be responsible for all costs associated with the tests.

6.5 Treatment Basin:

A treatment basin as described within and shown on the plan sheets shall be placed in the location as shown on Sheet S1. The basin will be excavated to a depth of four feet. Material removed to construct the basin shall be used for the embankment and or placed in the fill areas as shown on Sheet S2. The cross sectional view of the basin is as shown on Plan Sheet X1. Approximate dimensions will be 50 by 60 feet with a ten foot wide embankment at the top with 2 to 1 side slopes.

The bottom of the basin will be smoothed with all sharp objects including stones, roots or mining debris removed. Once smoothed and compacted a layer of Non-woven Filter fabric, as described in section 6.3.1 shall be placed on the bottom of the constructed basin and go a minimum of three feet up each side. The fabric will be pinned in place and have a minimum 6 inch overlap at all joints. Once the fabric is placed a liner as described in Section 6.3.2 shall be placed on top of the fabric. It will be installed and anchored in place per manufacturer’s recommendation. Care shall be taken to prevent any tears or rips of the liner while being installed. Any damage shall be repaired prior to placing anything on top of the liner. All joints shall be sealed with materials supplied by the manufacturer for use specifically for joint sealing of the liner and applied as recommended by the manufacturer.

After the liner is in place and anchored a six inch layer of AASHTO No. 67 limestone (1 inch minus), meeting the requirements listed in Section 6.3.4, shall be placed six inches thick on top of the liner.

The contractor shall use extreme caution when placing this initial layer of stone to prevent the liner from being punctured. Any tears or punctures of the liner caused by the contractor’s being negligent in placing the stone shall be repaired at the contractor’s expense. The stone shall be level so a uniform 6 inch cover of the bottom and sides of the liner is achieved.

Once the No. 67 stone is placed rock as described in Section 7.2.2 shall be placed.

6.6 Site Maintenance

Excavating and grading activities shall be performed so as to protect existing structures, utilities, trees, plants and other features designated to remain intact. During construction, the intermediate fill benches and cut areas shall be graded to avoid ponding surface water and to promote drainage away from excavations.

At the close of each day’s work, or when work is to be stopped for a period of time, the entire surface of the compacted fill shall be sealed by grading. If, after a prolonged rainfall, the top surface of the fill area is too wet and plastic to work properly, the top material shall be removed to expose firm material before fill placement resumes.

6.7 Measurement and Payment

6.7.1- Excavation: The method of measurement and basis on payment for Excavation/Grading and Basin construction all be on a lump sum basis, as indicated by the bid schedule and shall include full compensation for all items described within this section. Said unit price shall include excavation, backfilling, site regrading, materials, equipment, labor and any incidentals necessary to complete the work as described.

All excavation and backfilling required for the construction of ditches, or any other work shall be considered incidental to construction of the respective item and the cost for the same shall be included in the cost for that item.

6.7.2 Non-Woven Filter Fabric: Non-Woven filter fabric shall be measured per square yard installed, measured and accepted. This payment as specified in the bid schedule shall constitute full payment for all equipment, labor and materials needed to complete the work.

6.7.3 Basin Liner: Synthetic Rubber Ethylene Propylene Diene Monomer liner shall be measured per square yard installed, measured and accepted. This payment as specified in the bid schedule shall constitute full payment for all equipment, labor and materials needed to complete the work.

6.7.4 AASHTO No. 67 Limestone: No. 67 stone used within the basin shall be measured and paid to the nearest tenth of a ton of rock placed. The Contractor shall furnish certified weight slips to verify quantities claimed. Payment shall constitute full compensation for all materials, labor, equipment, tools and accessories required to complete the work in an acceptable manner.

7.0 DRAINAGE CONTORLS

7.1 Scope

The work included in this section consists of the installations of rock lined drainage channels and a rock check dam at the approximate locations and to the dimensions shown on the plans, and/or as outlined herein.

7.2 Materials

7.2.1 Machined Riprap (Class A-1) shall vary in size from 2 inches to 1.25 feet (15 inches) with no more than 20% by weight being less than 4 inches. The rock shall be limestone and meet the soundness requirements outlined in Section 709.03, TDOT 2015 Standard Specifications for Roads and Bridges. This stone shall be used for Channel #2; reconstructed spillway for the existing pond, and rock check dam.

7.2.2 Machined Riprap (Class A-3) shall vary in size from 2 to 6 inches with no more than 20% by weight being less than 4 inches. The rock shall be limestone and meet the soundness requirements outlined in Section 709.03, TDOT 2015 Standard Specifications for Roads and Bridges. This stone shall be used for Channel #1 and the treatment basin/bed.

7.2.3 Filter Fabric: The filter fabric used to underlay the drainage channels shall meet or exceed the following parameters:

Non-Woven Filter Fabric: Non-woven, Needle Punched, Geotextile used between the rock blanket drain and soil shall meet or exceed the following characteristics:

PROPERTIES TEST REQUIREMENT

Weight ASTM D5261 10 oz./Sq.yd.

Grab Tensile Strength ASTM D-4632 250 lbs. Min.

Mullen Burst Strength ASTM D-3786 500 psi min.

Trapezoidal Tear Strength ASTM D-4533 100 lbs. Min.

Permeability ASTM D-4491 1.2/sec max.

CBR Puncture Resistance ASTM D-6241 700 lbs. Min.

7.3 Channel Types

7.3.1 Channel # 1 Rock Lined (RL) - Will be a trapezoidal twenty (20)) foot wide flat bottom channel with 2 to 1 side slopes. The top width of channel will average 24 feet. The rock shall be 24 inches thick as shown on Plan Sheet D1 and lined with Class A-3 stone as described in Section 7.2.2. When placed, the riprap material shall be mechanically compacted in a manner which will eliminate voids and bridging within the stone. Filter fabric shall be placed prior to stone placement. Due to the width of this channel filter fabric will need to be overlapped somewhere along the width of the channel. Overlaps of two pieces of fabric shall be 6 inches.

7.3.2 Channel #2 RL Channel- Will be a trapezoidal five (5) foot wide flat bottom channel with 2 to 1 side slopes. The top width shall average11 feet in width. The rock shall be 18 inches thick as shown on Drawing D1 and lined with Class A-1 stone as described in Section 7.2.

When placed, the riprap material shall be mechanically compacted in a manner which will eliminate voids and bridging within the stone. Filter fabric shall be placed prior to stone placement.

7.3.3 Pond Spillway Channel- Will be a trapezoidal ten (10) foot wide flat bottom channel with 2 to 1 side slopes. The top width shall average 30 feet in width. The rock shall be 18 inches thick as shown on Drawing D1 and lined with Class A-1 stone as described in Section 7.2.

When placed, the riprap material shall be mechanically compacted in a manner which will eliminate voids and bridging within the stone.

7.3.4 Rock Check: A rock check dam shall be placed near the major water producing mine entry as shown on Sheet Plans S1 and 2. This check shall be comprised of Tennessee Class A-1 as described in Section 7.2.1. The check shall be constructed as shown on Plan Sheet D1. It will be three feet high and six (6) feet wide at the top. It will average 30 feet across but will at a minimum go completely across the water course and keyed into the surrounding slopes. The center of the check dam must be at least 6 inches lower than the outer edges.

High flows must go over the center of the checks, not around the edges. Prior to construction filter fabric as described in Section 7.2.3 shall be placed. The ground shall be cleared of any trees, large rocks or protruding roots prior to placing the fabric. Once the fabric is placed and secured rock shall be carefully placed on top of it.

7.4 Construction

7.4.1 The proposed rock lined drainage channels shall be constructed at the locations and to the dimensions shown on the plan drawings. The channels shall be lined with riprap in the general locations as indicated on the drawings. The subgrade for riprap shall be cleared and grubbed to remove all roots, vegetation, and debris and prepared to the lines and grades shown on the plans. As placed, the riprap material shall be mechanically compacted in a manner which will eliminate voids and bridging within the stone. Hand work may be required to correct irregularities. Excavation of all the channels shall be included under this item.

Materials generated to excavate the channel shall be placed immediately adjacent to the channels to create a berm. Filter fabric shall underlay all rock lined channels. Overlaps will be 6 inches and upstream fabric will go overtop the downstream section.

7.4.2 Any excess material generated by the work described in this section shall be placed in an approved on-site waste/fill area in a manner described in Section 7.0.

7.4.3 At the completion of the work, all disturbed areas shall be regraded in a manner as shown on the plans and revegetated in accordance with Section 8.0.

7.5 Measurement and Payment

7.5.1 Channel #1 Rock Lined (RL) Channel: The method of measurement and basis of payment for Channel # 1 RL Channel shall be per linear foot, properly installed. The price in the bid schedule shall include excavation of channel, filter fabric, transportation, materials, placement and any incidentals necessary to properly complete the work. Payment for this item will be made as indicated on the bid schedule. This payment shall be considered full compensation for all labor, pins, staples, equipment and materials necessary to complete the work.

7.5.2 Channel #2 RL Channel: The method of measurement and basis of payment for Channel # 2 Riprap Channel shall be per linear foot, properly installed. The price in the bid schedule shall include excavation of channel, filter fabric, transportation, materials, placement and any incidentals necessary to properly complete the work. Payment for this item will be made as indicated on the bid schedule. This payment shall be considered full compensation for all labor, pins, staples, equipment and materials necessary to complete the work.

7.5.3 Pond Spillway: The method of measurement and basis of payment for Pond Spillway Channel shall be per linear foot, properly installed. The price in the bid schedule shall include excavation of channel, transportation, materials, placement and any incidentals necessary to properly complete the work. Payment for this item will be made as indicated on the bid schedule. This payment shall be considered full compensation for all labor, pins, staples, equipment and materials necessary to complete the work.

7.5.4 Rock Checks- The method of measurement and basis of payment for the Rock Check shall be paid for per the unit price bid, per ton, based on certified weight tickets. The price in the bid schedule shall include purchase, transportation, placement and any incidentals necessary to properly complete the work. Said per ton price shall include full compensation for all materials, including the filter fabric, and proper installation. Only rock check placed where indicated on the plan drawings will be paid by the ton. Any checks placed for sediment and erosion control by the contractor shall be measured and paid for as described in 3.7.1.

Payment for any other items outlined in this section shall be considered incidental to the contract. The Contractor shall make the measurements of all the constructed channels with the inspector.

8.0 MINE OPENING AND SHAFT BACKFILL

8.1 Scope

The work involves the placement of onsite soil and rock into the partially collapsed mine opening and the exploration and filling of a suspected mine shaft/mine feature at the approximate locations shown on Plan Sheet S1 and S2. The mine opening was previously filled in when the site was abandoned. Over the years the material placed at the rock and soil interface near the top of the backfill has settled exposing a hole that would allow a person to crawl into the mine.

Adjacent to this is a depression that seems to be in the shape of a shaft or other mine feature.

The ground surface is spongy and it is not known the extent of fill that was used to previously fill the hole.

8.2 Description of Work

8.2.1 Mine Opening: The contractor shall gain access to the top of the mine openings and shaft location via the least disruptive path that minimizes disturbance to existing trees. The path must be pre-approved prior to clearing it. An excavator or similar equipment will be trammed up to the area. Onsite soil and rock adjacent to the opening shall be used to fill the exposed area. This material will be placed and compacted in lifts with the bucket of the machine. The surrounding area will be blended in to the back fill to allow for a smooth transition between disturbed and undisturbed slopes.

8.2.2 Shaft Area: The contractor shall partially excavate out the depressed area to determine the make-up of the fill material. If a void is found the hole shall be filled with surrounding rock material and soil. The excavator shall stay back a minimum of 10 feet from the edge of the depression while exploration work is being done, Material placed into the area shall be compacted in lifts by the bucket of the excavator. Once fill has come up to the elevation of the surrounding surface a two foot mound of soil will be placed over the area and graded to provide a smooth transition to the surrounding area.

At the completion of the work, all disturbed areas shall be regraded in a manner as shown on the plans and revegetated in accordance with Section 9.0.

8.3 Measurement and Payment

The method of measurement and basis on payment for Mine Opening and Shaft Backfill shall be on a lump sum basis, as indicated by the bid schedule for Mine Opening and Shaft Backfill and shall include full compensation for all items described within this section, creating access, excavation of materials and placement and compaction.

9.0 REVEGETATION

9.1 Scope

This work will consist of furnishing all labor, equipment and materials for preparing the seedbed, seeding, soil amendments and their application and mulching as specified. All disturbed areas are to be revegetated in accordance with this specification. The soil amendments as described below shall be applied to all revegetated areas. The Contractor shall establish a complete and permanent vegetative cover sufficient to control erosion and shall maintain such cover for one year (two growing seasons). No additional payments will be made for reseeding or top dressing poorly vegetated areas, unless it is determined by the Government to be from natural causes beyond the control of the Contractor.

9.2 Materials

9.2.1 Lime: Agriculture ground limestone or its equivalent shall be used. The ground limestone shall meet the following requirements: contain sufficient calcium and magnesium carbonate and be equivalent to not less than 80 percent calcium carbonate and must be fine enough so that not less than 90 percent shall pass through a U.S.

Standard No. 10 sieve and not less than 35 percent shall pass through a U.S. Standard No. 50 sieve. Agricultural ground limestone shall be purchased from quarries approved by the Tennessee Department of Agriculture.

9.2.2 Fertilizer: The fertilizer shall be a commercial fertilizer containing the plant nutrients of nitrogen, available phosphoric acid and soluble potash. Bagged fertilizer shall display the following information on the bag or on a sticker or tag attached to the bag: Net Weight, Brand and Grade, Guaranteed Analysis, and Name and Address of Manufacturer. Bulk fertilizer shall be accompanied by a statement from the manufacturer that contains the same information required for the bagged fertilizer.

9.2.3 Seed: Seed shall be applied in accordance with Table 9.0 (in this section) with no alterations. All seed shall be Certified free of any Wild Onion, Giant Foxtail, Nodding Thistle, Johnson grass, and Canada Thistle seed and contain less than two percent other crop seed. The seed shall also comply with all Tennessee seed laws and regulations.

*PLS -Pure Live Seed is determined by multiplying the percent germination of the seed time’s percent purity. Dividing this product into the specified rate yields the application rate. For example, if the germination = 70% and the purity = 90%, for a specified rate of 100 lbs/ac (PLS), approximately 160 lbs/ac [100/(.70 x .90) = 100/.63 = 158.7] are required.

All seed shall be delivered in separate bags or packages according to species. The tags from each seed bag shall be given to the COR or the inspector at the site. These tags will be required for final payment. Premixed seed will be accepted only if accompanied by a certified receipt from the supplier verifying the mixture contained in the bags. All legume seed shall be treated with inoculant prior to seeding in accordance with Paragraph 9.2.5.

9.2.4 Mulch: Unless otherwise specified, mulch shall consist of hay or straw on all areas.

Straw or hay mulch shall be air dry, reasonably light in color, and shall not be musty, moldy, caked, or otherwise of low quality. The use of mulch that contains noxious weeds will not be permitted.

The mulch shall be applied uniformly over all seeded areas at the rate of three (3) tons per acre.

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

Four (4) times the amount of inoculant recommended by the manufacturer shall be used when seeding is done hydraulically. Seed shall be sown within 24 hours of treatment and shall not remain in a hydraulic seeder longer than four (4) hours.

Table 9.0

SEED MIXTURES

SEEDING RATE

(lbs/ac PLS*)

Ladino or White Clover

Alsike Clover 9

Orchard grass

Timothy

Perennial Ryegrass

Switch Grass 5

Birdsfoot Trefoil

Lime 5 tons/acre

Fertilizer (10-20-10)

1,300 lbs./acre Mulch 3 tons/acre

9.3 Seedbed Preparation

Immediately following general grading, the areas to be seeded shall be dressed to a reasonably smooth and firm surface. Lime shall be applied uniformly at the rate off five (5) tons per acre.

Fertilizer shall be applied at a rate of 1300 lbs. /acre and shall have a grade of 10N-20P-10K, or approved equal. The lime and fertilizer shall be worked into the top three-four inches of soil by tracking, disking or other approved methods prior to seeding.

Seedbed preparation shall be suspended when soil conditions are not suitable for the preparation of a satisfactory seedbed. The COR shall make this determination.

9.4 Seeding

The specified mixtures of pure live seed (PLS) will be used on all disturbed areas using the seed rates shown on table 9.0.

All areas shall be seeded immediately following seedbed preparation. In the event the date does not concur with the seeding schedules specified, seeding shall be accomplished using any one of the specified rates or an equivalent rate designed to fit the site and weather conditions.

All seed shall be broadcast evenly over the area immediately following tilling using the cultipacker seeder, hydroseeder, or tractor-mounted cyclone seeder. The legume seeds shall be applied separately from all other seeds in all cases except when a hydroseeder is used. If a hydroseeder is used, the slurry pH shall not be allowed to drop below a pH of 5.0. In addition, the Contractor shall provide an accurate pH meter to monitor the slurry at all times.

9.5 Slope Protection Matting

Slope protection matting (SPM) shall be placed at a minimum on steep areas adjacent and within the scaled highwall areas and other areas where erosion potential is high.

The matting shall be comprised of medium term net erosion control blanket with functional longevity of up to 24 months. The blanket shall be covered on top and bottom with 100% biodegradable or photodegradable netting. All threading shall be photo or biodegradable. The matting shall at a minimum meet the following standards.

Permissible Maximum Flow Velocity Mass per Tensile Elongation Shear Stress Unit Area

2 lbs. /ft2 (96 Pa) 6ft/s (1.83 m/s) 8.8 oz. /yd2 30 %

Anchor trenches shall be placed at the top and bottom of the slope and shall be installed per manufacturer’s recommendations. U-shaped wire staples or metal geotextile pins shall be used to anchor blanket to the ground surface. Wire staples are to be a minimum thickness of 8 gauge (4.3 mm). Metal pins should be at least 0.20 in (5 mm) diameter steel with a 1 1/2 in (38

mm) steel washer at the head of the pin. Wire staples and metal pins shall be driven flush to the soil surface. All anchors shall be a minimum six (6) inches in length. At a minimum two (2) stakes per square yard will be placed to secure the matting and will be arranged as recommended by the manufacturer.

9.6 Measurement and Payment

9.6.1 Revegetation: The method of measurement and basis on payment for Revegetation shall be on a lump sum basis, as indicated by the bid schedule and shall include full compensation for all items described within this section, including seed bed preparation, seed, fertilizer, and mulch..

Said price shall be considered full compensation for all labor, equipment and materials necessary to complete the work.

9.6.2 Slope Protection Matting: SPM shall be measured to the nearest square yard of blanket placed and accepted. The SPM shall be paid at the cost per square yard as identified in the bid schedule. Payment for this item will be made as indicated on the bid schedule. This payment shall be considered full compensation for all labor, pins, staples, equipment and materials necessary to complete the work

10.0 TREE PLANTING

10.1 Description:

This work shall cover all operations incidental to the provision and planting of trees at areas designated by OSMRE. The work shall include, but not be limited to, purchase of trees;

delivery of trees to the site, planting of trees and all operations and materials incidental to the work.

The seedlings required for this project may be obtained at the Tennessee State Nursery. The

Contractor can contact the Nursery Manager at the State Nursery in Delano, TN, at phone number (423) 263-1626 for information. Also, can order online at http://www.tn.gov/agriculture/topic/ag-forests-seedlings . The contractor will be responsible for transporting the seedlings to the site. Note: Alternate tree suppliers may be required to complete the work as proposed.

10.2 Trees:

Trees shall be nursery stock of between 18” and 36” in height as measured above root zone.

The trees shall be a combination of the following species and number to be planted. OSMRE reserves the right to amend the species shown based on availability.

10.3 Care of Planting Stock:

Planting stock shall be picked up at a cooler or storage facility as needed for planting within two days of actual planting. Tree seedlings shall be protected from exposure to sun and drying during shipment, delivery to the planting site and handling at the project site. The seedlings shall be moistened and bundles remain unopened until ready to plant. All seedlings shall be planted within two days after picking up at a storage facility.