Warm_Spring_Special_Project_Specifications.pdf

Warm Spring Special Project Specifications

Special Project Specifications are applicable to the following bid items and are included in their entirety in this section. Within these Special Project Specifications, standard specifications are referenced. This reference is not intended to exclude other sections of the standard specifications. All general and standard specifications not referenced are still applicable.

SPS Preface

Delete all but the first paragraph and add the following:

The Forest Service, US Department of Agriculture has adopted FP-03 for construction of National Forest System

Roads.

SPS 101 - Terms, Format, and Definitions

101.01 Meaning of Terms

Delete all references to the TAR (Transportation Acquisition Regulations) in the specifications.

Delete all references to the FAR (Federal Acquisition Regulations) in the specifications.

101.03 Abbreviations.

Add the following to (a) Acronyms:

AFPA

MSHA

NIST

NESC

WCLIB

American Forest and Paper Association

Mine Safety and Health Administration

National Institute of Standards and Technology

National Electrical Safety Code

West Coast Lumber Inspection Bureau

Add the following to (b) SI symbols:

Mp Milepost

Ppm Part Per Million

101.04 Definitions.

Delete the following definitions and substitute the following:

Bid Schedule--The Schedule of Items.

Contractor--The individual or legal entity contracting with the Government for performance of prescribed work. In a timber sale contract, the contractor is the “purchaser”.

Culvert--No definition.

Right-of-Way--A general term denoting (1) the privilege to pass over land in some particular line (including easement, lease, permit, or license to occupy, use, or traverse public or private lands), or (2) Real property necessary for the project, including roadway, buffer areas, access, and drainage areas.

Add the following:

Adjustment in Contract Price--“Equitable adjustment,” as used in the Federal Acquisition Regulations, or

“construction cost adjustment,” as used in the Timber Sale Contract, as applicable.

Change--“Change” means “change order” as used in the Federal Acquisition Regulations, or “design change” as used in the Timber Sale Contract.

Design Quantity--“Design quantity” is a Forest Service method of measurement from the FS-96 Forest Service

Specifications for the Construction of Roads and Bridges. Under these FP specifications this term is replaced by the term “Contract Quantities”.

Forest Service--The United States of America, acting through the Forest Service, U.S. Department of Agriculture.

Schedule of Items--A schedule in the contract that contains a listing and description of construction items, quantities, units of measure, unit price, and amount.

Utilization Standards--The minimum size and percent soundness of trees described in the specifications to determine merchantable timber.

SPS 102 Bid, Award, and Execution of Contract

Delete Section 102 in its entirety.

SPS 104 - Control of Work

Delete subsections 104.01, 104.02, and 104.04.

Delete Subsection 104.03.

SPS 109 Measurement & Payment

Section 109, Measurement & Payment (Subsection 109.1)

Estimated bid quantities required for this project are shown on Sheet 2 of the Drawings. Estimated quantities are approximate and are to be used only as a basis for estimating the probable cost of the work and for the purpose of comparing the bids submitted for the work. Actual work done may differ from the estimated quantities. All estimated excavation quantities are in bank quantities prior to excavation.

Work required by the contract will be paid based on the Pay Unit (U.S. Standard English measure) as designated in the Schedule of Items.

Section 109 Measurement and Payment

Delete the following entire subsections:

109.06 Pricing of Adjustments.

109.07 Eliminated Work.

109.08 Progress Payments.

109.09 Final Payment.

Section 109.02 Measurement Terms and Definitions.

(b) Contract quantity.

Contract quantities will be adjusted only when there are errors in the original design of 15% or more.

Change the following:

“(b) Cubic yard” to “(c) Cubic yard”.

Add the following Subsection:

109.10 Methods of Measurement

One of the following methods of measurement for determining final payment is designated in the Schedule of Items for each pay item:

(a) Designed Quantities (DQ). These quantities denote the final number of units to be paid for under the terms of the contract. They are based upon the original design data available prior to advertising the project. Original design data include the preliminary survey information, design assumptions, calculations, drawings, and the presentation in the contract. Designed Quantities are replaced by and synonymous with Contract Quantities (CQ) in these specifications. Changes in the number of units designated in the Schedule of Items may be authorized under any of the following conditions:

(1) Changes in the work authorized by the CO.

(2) A determination by the CO that errors exist in the original design that cause a pay item quantity to change by 15 percent or more.

(3) A written request submitted to the CO showing evidence of errors in the original design that cause the quantity of a pay item to change by 15 percent or more. The evidence must be verifiable and consist of calculations, drawings, or other data that show how the designed quantity is in error.

(b) Actual Quantities (AQ). These quantities are determined from measurements of completed work.

(c) Lump Sum Quantities (LSQ). These quantities denote one complete unit of work as required by or described in the contract, including necessary materials, equipment, and labor to complete the job.

SPS 152 CONSTRUCTION STAKING AND SURVEYING

Section 152.03 Surveying and Staking Requirements

(m) The Forest Service will furnish all primary control and establish control coordinates for locating the principal components of the work with a suitable number of benchmarks adjacent to the work. The Contractor shall develop and make all detailed surveys needed for construction of the work involved. The Contractor shall be held responsible for the preservation of all primary and other control coordinate stakes. If control stakes are destroyed or disturbed by the Contractor, the cost for replacing them will be deducted from the payment for the work.

The Contractor shall stake all clearing limits, access and haul road locations, staging areas, culvert locations, excavation limits, excavation and fill surfaces needed for quantity calculations (if any), drainage and diversion ditches, and all other features of the work and receive approval from the CO before proceeding with the work on these items. The Contractor’s surveyor must be a Professional Land Surveyor in the State of Montana. The Forest

Service will furnish electronic files in Comma Separated Value (CSV) format or any other mutually agreeable format showing clearing limits, haul roads, staging areas, excavation and fill surfaces and any other features necessary to complete the work.

The Contractor’s surveyor shall survey the subgrade surface of the repository prior to placement of tailings and shall survey the final tailings surface. The Contractor shall supply survey data to the Forest Service including electronic files in Comma Separated Value (CSV) format or other mutually agreeable format of the survey surfaces.

Maintain a set of the contract drawings depicting as-built conditions. Maintain these drawings in current condition, and make them available for review. Indicate all variations from contract drawings in red on the drawings. Upon completion of the contract work, submit as-built drawings to the CO.

Section 152.06 Payment

Delete this section in its entirety and replace with the following:

Staking and surveying by the Contractor is considered incidental to other work items and no separate measurement or payment for this item will be made.

1.0 MOBILIZATION

The following Standard Specifications apply to this item:

Section 151 Mobilization

Work for this item shall also include the demobilization of the Contractor’s equipment, personnel and materials from the site on project completion.

2.0 GENERAL CONSTRUCTION REQUIREMENTS

The following Standard Specifications apply to this item:

Section 201 Clearing and Grubbing

Section 203 Removal of Structures & Obstructions

Section 157 Soil Erosion Control

Section 204 Excavation and Embankment

2.1 Composite Road Construction

Section 204, Excavation and Embankment (Subsection 204.01)

The Contractor shall upgrade Forest Road 4016 from the tailings site to the Repository road so that haul truck traffic can efficiently pass, either by the construction of turnouts, widening of the road, or both. This section of road shall be watered, bladed and maintained as necessary during the project. If the Contractor plans to use water from Warm

Springs Creek, Contractor shall coordinate the location, method, and usage per day with the CO.

The Contractor shall construct an access road from Forest Road 4016 to the repository site as shown on the

Drawings. An unimproved road to the site currently exists. The exact road location will be determined by the CO upon consultation with the Contractor. The access roads shall connect the repository, borrow areas, and soil stockpile areas. The Contractor shall ensure the roads are wide enough to safely travel with the largest piece of equipment to be utilized for the work. The trunks and roots of various old growth trees in the construction areas will be protected during the construction of the access roads. The Forest Service will mark the trees prior to construction.

Work includes excavating and grading. The Contractor may also need to provide drainage structures and base course aggregate, depending on site conditions.

The Contractor shall construct access roads for the tailings removal. Access road locations shall be determined by the CO with consultation of the Contractor. The access road to the south side of the T3 area shall require a creek crossing. A temporary culvert shall be used for the crossing. The Contractor may also need to provide drainage structures and base course aggregate, depending on site conditions. It is possible that wetland areas will be encountered after tailings removal that will affect the location of roads. The Contractor may wish to consider the use of geogrids or geofabrics to ensure the stability of haul roads in wet areas while minimizing roadfill material.

On completion of project, Contractor shall remove all fill and regrade all access roads constructed or improved for this project except that all improvements to Forest Road 4016 or as designated by the CO will be left in place.

Material removed from roads may be placed in the repository or hauled off-site to an appropriate landfill.

2.2 Clearing and Grubbing

Section 201, Clearing and Grubbing (Subsection 201.01)

This work consists of clearing and grubbing with the clearing limits designated on the plans and as approved on-site by the CO.

Section 201, Clearing and Grubbing (Subsection 201.03)

Merchantable timber shall be defined as having a minimum 4-inch top, 9 feet in length, and 1/3 sound. Logs shall be decked at a location determined by the CO.

Section 201, Clearing and Grubbing (Subsection 201.04a)

Fell all trees within the clearing area to minimize damage to merchantable timber and to remaining trees outside the clearing limits. Buck all logs to allow removal of merchantable pieces. Leave trees identified as remaining will be marked by the CO.

Section 201 Clearing and Grubbing (Subsection 201.06)

All merchantable timber will be cut to specified dimensions and deck in areas designated by the CO for future sale by the Forest Service.

Section 203 Removal of Structures and Obstructions (Subsection 203.05)

Place all non-merchantable slash from the repository and removal areas in piles located at sites determined by the

CO. Place piles so if future burning occurs the burn process will not damage remaining trees. Keep piles reasonably free from dirt and rocks. Cut all non-merchantable logs into lengths less than twenty feet prior to piling.

Scatter slash from tailings excavation area T3 and T4 in disturbed area as directed by the CO

2.3 Reconstruct Unnamed Tributary to Warm Springs Creek.

The stream channel and structure locations as shown on drawings shall be staked by the CO after the existing tailings have been removed. The stream channel shall be excavated to one foot below the approximate finished grade of the stream. Type III Stream channel substrate from an approved off-site location shall then be placed in the channel to the final grade as shown on the drawings. Each side of the channel shall be lined with 8-inch coconut fiber log. Topsoil shall be placed against the log so that it is approximately even with the top of the log and the native material.

A portion of the reconstructed tributary will cross the tailings impacted area. Water in the tributary, if present, shall be piped across the impacted area of T3 or on the boundary between T3 and T2 until the removal is complete and the new channel can be completed. Flow in the tributary, if present, is expected to be small. If an access road is constructed across the tributary, appropriate measures shall be taken to protect either the temporary pipe or the reconstructed channel.

Incidental to this item, the Contractor shall divert the tributary into the reconstructed channel. The diversion shall be done in such a way that the existing channel (upstream of the reconstructed channel) flows readily into the reconstructed channel.

2.4 Straw Bales

Section157, Soil Erosion Control (Subsection 157.05)

Construct filter barriers using straw bales as necessary at locations of concentrated flows as Designated by the CO to control sediment from runoff. Straw bales shall be certified weed free with the weed free tag attached and placed as illustrated on Drawings.

Section 157, Soil Erosion Control (Subsection 157.15)

Measurement for this item shall consist of counting the Actual Quantity of full size (approx. 42” x14” x 16”) straw bales completed and approved. Do not count replacement bales.

2.5 Silt Fence

Section 157, Soil Erosion Control (Subsection 157.05)

Construct filter barriers from silt fence as necessary for overland or sheet flow at locations designated by the CO and installed as illustrated on Drawings to control sediment from runoff.

Measurement for this item shall consist of measuring the Actual Quantity of silt fence completed and accepted.

Measurement shall be taped along silt fence from post to post.

3.0 REPOSITORY

The following Forest Service Specifications apply to this Section:

Section 153 Contractor Quality Control

Section 204 Excavation and Embankment

Section 624 Topsoil

Section 714 Geotextile and Geocomposite Drain Material

3.1 Excavate Repository, Screen, and Stockpile Soil

The Contractor shall excavate the repository for the deposition of tailings from the Warm Springs Tailings in accordance with requirements SHOWN ON THE DRAWINGS.

This work item includes excavation of soils from the designated repository, screening, and stockpiling of the excavated soils for later use on the repository cover and at the mine site. Excavated material containing boulders shall be screened with a 6-inch grizzly with clear square openings. Topsoil, other surface material, decomposed granite, and boulders shall be stockpiled separately. The repository area is located approximately 1 mile west of the tailings area.

The Contractor shall place excavated material from the repository in the designated stockpile areas, where shown on the Drawings using side casting and end dumping.

3.2 Drain Gravel Runout Apron

Excavate drain gravel runout apron as shown on the plans. The runout apron shall be 5.5 feet wide and 1 foot deep and shall be constructed around the entire repository. The GCL shall extend over the apron 1.5 feet and the drainage layer with filter fabric shall cover the entire apron.

As part of this bid item, the entire runout apron shall be filled with ¾-inch minus gravel. Gravel shall conform to the gradation listed in Standard Specifications Section 704.09 except that maximum size shall be ¾ inches.

Incidental to this item, 6-inch perforated pipe shall be placed in the drain gravel runout apron along the south side of the repository as shown on the Drawings. Where this pipe leaves the drain gravel runout apron, the pipe shall consist of 6-inch non-perforated pipe. These pipes shall drain to the sediment catch basins as shown on the drawings. Pipes shall be placed so that there is positive drainage. All drain pipes shall conform to Standard

Specifications section 706.08 (d).

3.3 Geosynthetic Clay Liner (GCL)

Section 714, Geotextile and Geocomposite Drain Material (Subsection 714.04)

The Contractor shall furnish a Geosynthetic Clay Liner (GCL) to be placed over the tailings repository. The

Contractor shall place the GCL in accordance with requirements shown on the drawings and as described in

Subsection 207.04 of the standard specifications. Payment shall be for actual area covered with the liner.

Additional material will be necessary for overlaps etc. but will not be paid.

The uppermost 12-inch lift in the repository will consist of fine grained tailings to prevent damage to the GCL.

Preparation of the uppermost lift will include removal of roots, organic matter, rocks, and all other material/debris with a nominal diameter of 3/4 inch or greater and grading and rolling to match the lines and grades indicated on the drawings. The Contractor shall confer with the CO to determine the source of material for the final lift. Preparation of the final lift of waste material will be accomplished under Bid Item 4.1.

This work item includes constructing the liner system that will overlay the compacted wastes in the repository.

Details of the liner system are shown in the drawings. The GCL shall be placed directly over the prepared and compacted wastes. Placement of GCL shall be in accordance with manufacturer’s specifications in a manner that keeps the material free of wrinkles and folds.

GCL Specifications

The active ingredient of the GCL shall be natural sodium bentonite. The bentonite shall be encapsulated between two polypropylene geotextiles.

The bentonite shall be continuously adhered to both geotextiles to ensure that the bentonite will not be displaced during handling, transportation, storage and installation.

The bentonite and geotextiles used to manufacture the GCL shall have the following properties:

TABLE 1: GCL PHYSICAL PROPERTIES

Material Property Test Method Test Frequency, ft , (m

) Required Values

Bentonite Swell Index ASTM D 5890 1 per 50 tons 24 mL/2g min.

Bentonite Fluid Loss ASTM D 5891 1 per 50 tons 18 mL max.

Bentonite Mass/ Area ASTM D 5993 40,000 ft

(4000 m

) 0.75 lb/ft

(3.6 kg/m

GCL Grab Strength ASTM D 4632 200,000 ft (20,000 m

) 90 lbs (400 N)

GCL Peel Strength ASTM D 4632 40,000 ft (4000 m

) 15 lbs (65 N)

GCL Index Flux ASTM D 5887 Weekly 1 x 10 -8 m /m

/sec

GCL Permeability ASTM D 5084 Weekly 5 x 10 -9 cm/s

GCL Hydrated Internal Shear

Strength ASTM D 5321 Periodic 500 psf (24 kPa) typical

The bentonite sealing compound or bentonite granules used to seal penetrations and make repairs shall be made of the same natural sodium bentonite as the GCL and shall be as recommended by the GCL manufacturer.

The GCL shall be Bentomat ST as manufactured by CETCO, 1350 West Shure Drive, Arlington Heights, IL 60004

(phone 1 800.527.9948) or approved equivalent.

Submittals

A. Submit the following to the CO, for written approval, at least seven (7) days prior to GCL installation.

1. Manufacturer’s specifications for GCL, which includes properties contained in Table1.

2. GCL panel layout plan.

B. Submit the following as installation proceeds:

1. Upper waste lift surface acceptance (the Contractor shall notify the CO at least 24 hours in advance for written approval and acceptance of the surface of the uppermost lift of waste in the repository), for the area that will be covered directly by the GCL.

Defects and Repairs

1. Repair all flaws or damaged areas by placing a patch of the same material extending at least 1 foot beyond the flaw or damaged area.

2. Treat seams of damaged areas according to manufacturer’s specifications.

Overlaps

1. Overlap GCL to the manufacturers match line.

2. Install the GCL panels so that seams are oriented up and down steeper slopes, not along slopes.

3. Apply granular bentonite to overlap areas. After the overlying panel is placed, its edge shall be pulled back to expose the overlap zone. Any soil or debris present in the overlap zone shall be removed. A fillet of granular bentonite shall then be poured in a continuous manner along the overlap as per the manufacturer’s specifications.

4. The GCL shall extend from the repository onto the surrounding native soils a minimum of 2 feet.

3.4 Drainage Material With Filter Fabric

Section 714, Geotextile and Geocomposite Drain Material (Subsection 714.05)

The Contractor shall place the HDPE drainage material and filter fabric over the GCL in accordance with requirements shown on the Drawings and as described in Subsection 207.04.

The HDPE drainage net (geonet) shall be an integrally formed polyethylene structure. It shall have uniform channels, open area, and thickness to ensure uniform flow throughout the surface. It shall have low compressibility under high loadings to maintain a high transmissivity under a range of loading conditions. The drainage net shall be resistant to ultraviolet degradation. The drainage net shall comply with the following minimum properties:

Drainage Net Physical Properties

Tested Property Test Method Minimum Average Values

Transmissivity ASTM D 4716-99 1 x 10 -3 m /sec

Thickness ASTM D 5199 200 mil (5 mm)

Density ASTM D 1505 0.94 g/cm

Tensile Strength ASTM D 5035 32 lb/in

Carbon Black Content ASTM D 1603 2.0 %

The geotextile filter fabric shall be a non-woven, needle-punched geotextile fabricated form polypropylene or polyester resin. Physical properties shall be as follows:

Geotextile Physical Properties (Minimum Average Values)

Tested Property Test Method Minimum average Values

Apparent Opening Size ASTM D 4751 0.212 mm (70, US std Sieve)

Thickness ASTM D 5199 70 mil (2 mm)

Mass Per Unit Area ASTM D 5261 6 oz/sy (200 g/m

Water Flow Rate ASTM D 4491 110 gal/min/ft (4480 l/min/m

Permeability ASTM D 4491 0.24 cm/sec

Puncture ASTM D 4833 85 lbs (378 N)

Trapezoid Tear ASTM D 4533 70 lbs (310 N)

Grab Tensile Strength ASTM D 4632 150 lbs (710 N)

Grab Elongation ASTM D 4632 50 %

Mullen Burst ASTM D 3786 330 psi (2275 kPa)

UV Resistance @ 500 hrs ASTM D 4355 70 % retained

The Contractor shall utilize a geocomposite material that includes the drainage net and filter fabric, rather than layering separate materials. The geotextile fabric shall be bonded to the drainage net in a manner that does not impede the function of either component of the lining system. Payment shall be for actual area covered with the liner. Additional material will be necessary for overlaps etc.

All seams shall be joined according to manufacturer’s specifications.

3.5 Excavate and Install Curtain Drain

Excavate and install the curtain drain as shown on the plans. The geocomposite drain material is designed to be installed in a narrow vertical trench without personnel having to enter the trench. Contractor shall plan excavating and installation methods for installation in this manner. Geocomposite drain material shall be placed in the repository side of the trench according to manufacturer’s recommendations using manufacturer recommended installation straps. Geocomposite drain shall be Eljen or approved equivalent with minimum flow capability of 15 gallons per minute per foot width and a waterproof backing. Strap stakes shall be used to hold the geocomposite drain material liner in place during filling of the trench. 6-inch perforated pipe shall be placed in the bottom of the trench. The drain pipe shall be installed so it has positive drainage with a minimum 2% slope. The curtain drain shall end as shown on the drawings.

As part of this bid item, 6-inch corrugated HDPE pipe shall extend from the end of the curtain drain collector pipes to the sediment catch basins. The pipe shall be bedded in 1 foot of drain rock. The drain rock shall be covered with non-woven geotextile to separate from the overlying native fill. All pipes shall conform to Standard Specifications section 706.08(d).

Non-woven geotextile shall meet the following requirements:

Tested Property Test Method Minimum average Values

Water Flow Rate ASTM D 4491 80 gal/min/ft (l/min/m

Grab Tensile Strength ASTM D 4632 150 lbs (710 N)

Mullen Burst ASTM D 3786 330 psi (2275 kPa)

Drain rock shall be 2-inch minus washed rock with less than 2% minus 200 sieve content.

Backfill the curtain drain trench with select native backfill. No particles larger than two inches shall be used adjacent to the curtain drain. No particles larger than six inches shall be used above the curtain drain. Backfill and compact in loose lifts not to exceed twelve inches. Compact using bucket mounted compactors or remotely operated vibrating steel-wheeled compactors. Make at least three passes with compaction equipment.

Backfill the portion of the trench above the non-perforated pipe and drain rock using select native backfill. No particles larger than six inches shall be used. Backfill and compact in loose lifts not to exceed twelve inches.

Compact using bucket mounted compactors or remotely operated vibrating steel wheeled compactors. Make at least three passes with compaction equipment.

3.6 Place and Grade Backfill

Section 204, Excavation and Embankment & Haul (Subsection 204.10)

The Contractor shall obtain backfill from the repository stockpile consisting of screened silty sandy material from repository excavation.

Backfill shall be placed to a minimum depth of 3.5 feet over the entire repository cover except that portion designated as temporary cover. Backfill over the temporary cover shall be to a depth of 12 inches. Backfill will be placed (dumped) on the edge of the repository and moved from the bottom up the slope of the repository using low-ground-pressure tracked equipment. A minimum of 12 inches of backfill shall be in place above the geotextiles before tracked equipment moves onto the repository.

3.7 Placing Topsoil

Section 624, Topsoiling (Subsection 624.02)

The Contractor shall make topsoil using excavated topsoil from the repository area and screened colluvial material from the repository excavation. Decomposed granite shall not be used to make topsoil.

The Contractor shall add compost to the topsoil/screened colluvium so that it meets the requirements specified in

Subsection 713.01. Topsoil/screened alluvium shall be thoroughly mixed with compost so as to appear uniformly colored. For purposed of estimating the amount of compost required to meet the requirements of Subsection 713.01

(a) 1 a. it should be assumed that there is no measurable organic matter present in the colluvial material. Compost shall be certified as weed free. Contractor shall submit the source of compost to the CO for inspection and approval prior to it being moved to the site.

Topsoil shall be placed over the backfill as shown on the drawings. Depth of the topsoil shall be 0.5 feet. , Disk or use other agricultural tilling equipment to loosen topsoil compacted by traffic from topsoil placement. Ripping is not an acceptable method of loosening. After placement of the topsoil, the surface shall be ready for seeding and mulching.

3.8 Ditch for Soil Erosion and Pollution Control

Section 157 Soil Erosion Control (Subsection 157.01)

Construct run-on diversion ditch, as shown on the drawings, to divert precipitation and snow melt runoff from the repository. The run-on diversion ditch shall have positive drainage so that no pooling of water can occur within the ditch.

Also included in this bid item, erosion control mat shall be placed in the bottom of the run-on diversion ditch, as shown on the drawings. Erosion control mat shall be Type 2 (a) or (b) in accordance with Subsection 713.13.

Erosion control mat shall be stapled to the ground using approximately 1 staple per square yard or per the manufacturer’s recommendation. Overlap mats according to manufacturer’s recommendations.

Section 204, Excavation and Embankment

Measure this item by the Actual Quantity of completed and approved Ditch. Measure the lineal length of ditch completed and approved along the ditch centerline. No separate measurement or payment is made for the erosion control mat.

3.9 Sediment Basin

Section 157 Soil Erosion Control (Subsection 157.01b)

Construct sediment catch basins, as shown on the drawings, at each end of the run-on diversion ditches. Provide and place riprap within the catch basin as shown on the drawings. Excavate and haul excavated soils as necessary to appropriate stockpiles.

Section 157 Soil Erosion Control (Subsection 157.15)

Measurement of this item will consist of counting the Actual Quantity of Sediment Basins that are completed and accepted. No separate measurement or payment will be made for riprap, excavation or incidentals necessary for this item.

3.10 Temporary Overwinter Erosion Control Measures (Silt Fence)

Section 157, Soil Erosion Control (Subsection 157.05)

For all temporary soil sorting and stockpiling areas with soil remaining on project completion, doze or otherwise push up remaining soil into the smallest area possible. Isolate the entire perimeter of the remaining soil with silt fence where sheet flow occurs. Do not revegetate remaining stockpiled soil.

Measurement for this item shall consist of measuring the Actual Quantity of silt fence completed and accepted.

Measurement shall be taped along silt fence from post to post.

3.11 Temporary Overwinter Erosion Control Measures (Straw Bales)

Section157, Soil Erosion Control (Subsection 157.05)

For all temporary soil sorting and stockpiling areas with soil remaining on project completion, doze or otherwise push up remaining soil into the smallest possible area. Isolate the entire perimeter of the remaining soil by constructing filter barriers using straw bales as necessary at locations of concentrated flows to control sediment from runoff. Straw bales shall be certified weed free with the weed free tag attached and placed as illustrated on

Drawings. Do not revegetate remaining stockpiled soil.

Measurement for this item shall consist of counting the Actual Quantity of full size (approx. 42” x14” x 16”) straw bales completed and approved.

4.0 Tailings Excavation

The following Standard Specifications apply to this Section:

Section 624 Soil Erosion Control

4.1 Excavate Tailings, Load, Haul, and Place in Repository

The Contractor shall excavate all tailings and approximately 6-inches of underlying soil from the Warm Springs

Creek tailings areas T3 and T4, as shown on the drawings and staked by the CO. After completion of the excavation, the CO will take measurements using an X-ray Fluorescence (XRF) instrument that will be correlated to a number of collected samples for laboratory analysis to confirm that contamination has been removed. Upon successful analysis by the XRF, the CO shall give the contractor approval to backfill excavated areas. Tailings material excavated from the tailings area shall be loaded, hauled, and placed in the repository. Contractor shall take all precautions and measures to ensure that tailings are not spilled or otherwise lost from haul vehicles between the tailings areas and the repository. Precautions shall include the use of constructed access roads to prevent the accumulation of tailings on haul truck undercarriages and tires. Other measures shall include the sweeping or washing of tailings from haul truck side bars or tires. In the event of an accidental spill of tailings on access roads, Contractor shall immediately remove the spilled tailings and transport them to the repository and take steps to ensure that future spills will not occur.

Tailings material to be excavated consists of fine sand, elastic silt, and topsoil. The elastic silt has the consistency of clay and is expected to be approximately 60% of the excavated material. Wet tailings shall be temporarily stockpiled on site for drying prior to placement in the repository. Drying will continue until material can meet compaction requirements. Haul of tailings that results in visible dripping from haul trucks is not permitted.

Some areas within the tailings removal area are expected to be wetlands after the removal. Saturated soil conditions may be encountered at some locations.

Incidental to this item, all wood debris uncovered during tailings excavation shall be stockpiled at a location determined by the CO after the tailings have been removed. Wood debris will then be placed on the restored removal areas.

Incidental to this item, two decant towers located in the T3 area must be salvaged and relocated. These are historical features and will be placed at a location determined by the CO when they are removed.

Section 204, Excavation and Embankment (Subsection 204.11)

Delete Section 204.11 in its entirety and replace with the following:

The waste material shall be placed in 12-inch (maximum) loose lifts. Contractor shall conduct Compaction tests after placement in the repository consisting of 2 density tests per lift to confirm that waste material is compacted to

90% of maximum laboratory density. Compaction testing frequency may be altered by the CO. Contractor shall provide at least one Moisture-Density Proctor Curve per AASHTO T-99 for each type of material encountered.

Contractor shall test compaction using the methods of AASHTO T-310 or other approved test procedures at the frequencies noted above. Contractor shall use the methods of AASHTO T-224 to correct for coarse particles as needed. Contractor testing for compaction and Proctor Density curves shall be considered incidental to this item.

The CO may choose to independently verify the Contractor’s Compaction Testing. Material excavated from obliterated access roads shall be placed similarly to tailings. However, if the material contains geogrids or geofabrics, the geogrids and geofabrics must be scattered through as many lifts as possible and scattered within each lift.

The final lift shall be free of sticks, debris and rocks greater than ¾ inch to prevent damage to the GCL. Work includes preparing, grading, and rolling the upper lift of compacted waste to match the lines and grades specified on the drawings so that the surface is ready for placement of the GCL. No material containing geogrids or geofabrics may be placed in the final lift.

4.2 Excavate Tailings Impacted Topsoil Adjacent to Creek in T4 Area

Section 204, Excavation, Embankment, & Haul (Subsection 204.01)

The Contractor shall excavate tailings impacted topsoil adjacent to the creek in the T4 area, as shown on the

Drawings. Areas where soil is to be removed will be staked by the CO. Soil removed adjacent to the creek during this excavation shall be loaded into trucks, hauled, and placed in the repository. The Contractor shall begin the excavation of topsoil 1 to 2 feet away from the bank, leaving the stream bank intact or shall place a coconut fiber log such that it will form the bank after reconstruction as well as form a barrier protecting the creek during construction.

Areas where cut banks occur shall require a coconut fiber log. The coconut fiber logs shall be sized and staked as shown on the drawings. Silt fence may be required at the cut bank locations to prevent excavated material from entering the creek. An estimated 120 feet of creek bank may need coconut fiber log reinforcement prior to tailings excavation and floodplain shaping. Live alders within the floodplain shall remain in place. The CO shall flag all alders that are to remain.

4.3 Place and Grade Backfill

Section 204, Excavation and Embankment (Subsection 204.06)

In conjunction with the removal of tailings and construction of the new reconstructed channel within T3, the

Contractor shall backfill the old stream channel in Tailings Area 3 to the grades shown on the Drawings after the new channel becomes operational. Backfill shall be smooth, uniform and shaped to the typical sections shown on the drawings. Contractor shall obtain material for the backfill first from surplus excavation remaining from excavation of the new channel in Tailings Area 3. If additional backfill is needed to reach the grades shown on the

Drawings, the Contractor shall obtain excess material from the repository stockpile not needed for repository construction. Any material excavated from the repository may be used as backfill, including boulders. Decomposed granite and boulders shall be placed at depth. The final 1.5 feet of backfill shall be sandy silt material.

5.0 Stream Channel Reconstruction

The following Forest Service Specifications apply to this Section:

Section 624 Topsoiling

5.1 Reconstruct Stream Channel in the T3 Area

The stream channel and structure locations shall be staked by the CO after excavation of tailings. The Contractor shall excavate topsoil in the area of the staked channel and stockpile the soil at a location determined by the

Contractor and CO.

After topsoil removal, the floodplain shall be excavated to its approximate finished grade with allowance for the placement of topsoil. The stream channel shall be excavated to one foot below the approximate finished grade of the stream as shown on the Drawings. Excavation shall be accomplished so that the final stream grade can be completed by the addition of the stream channel substrate.

Appropriate substrate shall be placed in the excavated stream channel to the final grade as shown on the drawings.

Stream water shall be introduced into the newly reconstructed channel in a controlled manner to avoid the introduction of sediment into the stream system below the reconstruction of the stream channel.

As part of this bid item, the Contractor shall excavate trenches for placement of the boulder drop structures.

Section 204, Excavation and Embankment (Subsection 204.16 (g))

Measurement of this item will consist of counting the Actual Quantity of reconstructed channel as measured along the reconstructed channel centerline. No separate measurement or payment will be made for gravel, riprap, excavation, haul or incidentals necessary for this item.

5.2 Construct Boulder Drop Structures

Construct boulder drop structures as shown on the drawings. Locations of the structures shall be staked by the CO.

Substrates to be used shall be Type I and Type II stone.

Section 203, Excavation, Embankment & Haul (Subsection 204.16(i)

Measurement of this item will consist of counting the Actual Quantity of Boulder Drop Structures completed and approved. No separate measurement or payment will be made for gravel, excavation, haul or incidentals necessary for this item.

5.3 Provide and Install Coconut Fiber Logs

Section 157, Soil Erosion Control (Subsection 157.01)

Coconut fiber logs shall be installed along the edge of the reconstructed stream channel as shown on the drawings.

Coconut fiber logs shall be 8-inches in diameter. Coconut fiber logs shall be staked using wooden stakes 2 x 4 x 30 inches tapering to a point and attached to the stakes according to manufacturer’s recommendations. Stakes shall be placed every 2 feet on the stream side of the log and every 8 feet on the floodplain side.

5.4 Regrade Tailings Removal Area

Section 204, Excavation and Embankment (Subsection 204.13 (c))

Regrade the tailings removal area after tailings removal and stream reconstruction as shown on the Drawings. The floodplain shall be graded to the final shape allowing for topsoil placement.

Item 5.5 Furnishing and Placing Topsoil

Section 624, Topsoiling (Subsection 624.02)

The Contractor shall obtain topsoil from an off-site source as approved by the CO.

Section 624, Topsoiling (Subsection 624.03)

Topsoil shall meet the requirements specified in Subsection 713.01. Contractor shall submit sample analyses for the source of topsoil showing compliance with 713.01 to the CO for inspection and approval prior to it being moved to the site.

Section 624, Topsoiling (Subsection 624.04)

Topsoil shall be spread to a depth of 8 inches along the banks of the reconstructed floodplain and to 6 inches in any other areas where the topsoil has been damaged. Excess topsoil shall be spread at the direction of the CO.

6.0 Other Reclamation Activities

The following Standard Specifications apply to this Section:

Section 211 Roadway Obliteration

Section 625 Turf Establishment

Section 622 Rental Equipment

Item 6.1 Treatment of Existing Road, Method 1

Section 211, Roadway Obliteration (Subsection 211.01)

All access roads constructed for the tailings removal shall be obliterated using Method 1 described below.

Temporary stream crossings shall be restored to match the surrounding floodplain and creek.

6.2 Site Revegetation

Section 625, Turf Establishment (Subsection 625.01)

Seed, fertilize, and mulch all disturbed areas according to the schedule on Table 6.1 and as shown on the drawings.

Large clumps, greater than 3 inches in diameter or compacted soil will be broken down by disking or similar means to ensure the greatest amount of surface area is available for planting. Rough, broken ground surface will ensure the highest efficacy of seed germination and plant establishment.

Revegetation zones in the tailings removal area will be staked by the CO prior to planting

Section 625, Turf Establishment (Subsection 625.06- Fertilizer)

Delete this section in its entirety and add the following:

The topsoil amendment shall be Biosol Mix or approved equivalent. Biosol Mix shall be applied topically using dry broadcasting method onto the surface of exposed soil at a rate of 1,800 pounds per acre. The Biosol Mix will be applied after seeding. Biosol Mix contains 7-2-3 Nitrogen-Potassium-Phosphorous ratio and is available from

Rocky Mountain Bio-Products (970) 926-1025.

Section 625, Turf Establishment (Subsection 625.03)

Delete the first sentence of this section and replace with the following:

Seeding and fertilizing shall be done within 7 days of final grading of any portion of the site.

Section 625, Turf Establishment (Subsection 625.04)

The entire area to be seeded shall be roughened to a depth of four inches using agricultural cultivating equipment such as disks or other tillage equipment. Roughening with rippers is not allowed.

Section 625, Turf Establishment (Subsection 625.07)

All seed shall meet the requirements of Section 713.04 of the standard specifications.

Apply seed mixture using Method b (Hydraulic Seeding) and at the rates and seed types shown on Table 6.1 below.

Inoculated legume seed shall be applied by broadcast seeding method at the rate specified in Table 6.1 below.

Seeding application shall be done as soon as possible after inoculating using Rhizobium bacterium

Section 625, Turf Establishment (Subsection 625.08)

Mulch shall be Montana certified weed free straw with the weed free certification attached.

Apply mulch uniformly at a rate of 2,000 pounds per acre after the seed and fertilizer have been applied. The mulch shall be spread evenly, free of large clumps. Mulch shall be crimped into the soil using a mechanical mulch tiller approved by the CO.

Table 6.1 Site Revegetation Schedule

Seed mix for Zone #1 (3.4 acres) Common Name Scientific name Stock type Application rate*

(lbs/ac)

Lupinus spp. mountain lupine Seed/Inoculated 4

Grass** 14

Slender wheatgrass Elymus trachycaulus ssp. seed trachycaulus

Tufted hairgrass Deschampsia cespitosa seed

Rough bentgrass Agrostis scabra seed

Canada wildrye Elymus canadensis seed

Mountain brome Bromus marginatus seed

Nurse Crop

Sterile wheat Triticum aestivum seed 200

*Application rate based on drill seeding method. Application rates will be doubled for broadcast seeding

**Species availability may affect seed mix composition. The application rate will be made up of a minimum of the four grass species listed with the same application rate used for each species

Seed mix for Zone #2 (7.6 acres) Common Name Scientific name Stock type Application rate*

(lbs/ac)

Lupinus spp. mountain lupine Seed/Inoculated 5

Grass** 16

Bluebunch wheatgrass Pseudoroegneria spicata seed

Western wheatgrass Pascopyrum smithii seed

Sandberg’s bluegrass Poa secunda seed

Rough bentgrass Agrostis scabra seed

Slender wheatgrass Elymus trachycaulus ssp.

trachycaulus seed

Canada wildrye Elymus canadensis seed

Bluebunch wheatgrass Pseudoroegneria spicata seed

Nurse Crop

Sterile wheat Triticum aestivum seed 300

*Application rate based on drill seeding method. Application rates will be doubled for broadcast seeding

**Species availability may affect seed mix composition. The application rate will be made up of a minimum of the four grass species listed with the same application rate used for each species

Item 6.3 Dozer, Fully Operated

Section 622, Rental Equipment (Subsection 622.01)

Contractor shall provide dozer with operator. Dozer shall be a minimum size equivalent to a Caterpillar D6 or equivalent with hydraulically operated blade and ROPS.

Item 6.4 Dump Truck, Fully Operated

Section 622, Rental Equipment Rental (Subsection 622.01)

Contractor shall provide dump truck with operator. The Dump Truck shall have a minimum load capacity of 10 cubic yards.

Item 6.5 Excavator With Thumb, Fully Operated

Contractor shall provide a tracked excavator with thumb with an operator. The excavator shall have a bucket capacity of at least one cubic yard.

Item 6.6 Grader, Fully Operated

Contractor shall provide a grader with operator for the purpose of blading roads during the project or other purposes as deemed necessary by the CO. The grader shall have a minimum 12-foot long moldboard with hydraulic controls.