Attachment_1-_Specifications_Phillips_Reservoirs_Repair.pdf

Technical Specifications for

2026 Phillips Reservoirs

BUREAU OF LAND MANAGEMENT

Malta Field Office

501 South Second Street East Malta, Montana 59538

April 2026

THIS PAGE IS INTENTIONALLY LEFT BLANK

PROJECT SPECIFICATIONS

INDEX

DIVISION 1 – GENERAL REQUIREMENTS

Section 01009 ……………………………………. General Information and Requirements

DIVISION 2 – SITE WORK

Section 02231 ………………….…………………. Clearing and Grubbing

Section 02275 ………………….…………………. Riprap

Section 02300 ………………….…………………. Earthwork

Section 02350……………….……………………… Erosion Control Mat

Section 02910……………….……………………… Restoration and Topsoiling

Work Data Sheet

2026 Phillips Reservoirs GENERAL INFORMATION AND REQUIREMENTS

04/24/2026 01009-1

DIVISION 1 – GENERAL REQUIREMENTS SECTION 01009 – GENERAL

INFORMATION AND REQUIREMENTS

PART 1 - GENERAL

1.01 SUMMARY:

A. Description of Work: Furnish labor, equipment, supplies, and materials to repair two reservoirs in south Phillips County, Montana.

1. Flintstone Reservoir: Repair the dam embankment and reconstruct the spillway.

• Dam embankment: Remove trees and other woody vegetation from the upstream slope, repair erosion on the upstream slope, and raise crest to a uniform elevation.

• Spillway: Remove and stockpile existing scattered riprap, remove and dispose of existing geotextile fabric. Reconstruct the spillway and armor with erosion control mat. Build riprap apron with stockpiled riprap.

2. Hump Reservoir: Repair erosion on the upstream slope of the dam embankment.

B. Project Location: Work under this contract is in Phillips County, State of Montana. The work locations are shown in the drawings.

C. Work Data Sheet: Designates the type and quantity of work required at each project location.

D. Drawings: Designate the details of work required.

1.02 DEFINITIONS:

A. Approvals: Approval of the submittals is an indication that the Contractor’s submittals have been reviewed and that there are no objections, except as noted. Approval of deviations shall apply only to those deviations or omissions from the requirements of the drawings and specifications brought to the Government’s attention in writing. Any work done, or materials provided prior to approval shall be at the Contractor’s own risk and will not be eligible for payment until approval is obtained.

1.03 SUBMITTALS:

A. Scope: Submittals include:

1. The Contractor’s work schedule.

2. Manufacturer’s literature and installation instructions for erosion control mat.

3. Perennial seed mix.

B. Requirements: Allow at least 10 working days for review. Submittals shall be delivered to the

04/24/2026 01009-2

Contracting Officer or appointed Contracting Officer’s Representative.

1.04 QUALITY ASSURANCE:

A. Codes and Standards: The work shall comply with codes and standards applicable to each type of work and as listed in the individual sections of these specifications. This Contract incorporates materials, applications, and tests by reference, with the same force and effect as when they were given in full text.

B. Conflict: Where a conflict occurs between reference documents and project specifications, the project specifications shall govern.

1.05 DELIVERY, STORAGE, AND HANDLING:

A. Delivery: The Contractor shall protect products incorporated into the work from damage while in transit to the site.

B. Handling: The Contractor shall load and unload products in such a manner that protects them from damage until installation on the project.

1.06 PROJECT/SITE CONDITIONS:

A. Access to the Work:

1. The work site is accessed by U.S. Highway, County Roads, and BLM Roads. Any public or private roads including bridges, cattle guards, gates and culverts, or any off-road travel areas damaged in any way by the Contractor’s operations shall be restored by the Contractor, at the Contractor’s expense, to the same condition existing prior to the commencement of work.

2. Access to the work shall be provided by and at the Contractor's expense.

3. The Contractor shall obtain approval from the Government prior to making improvements to access roads across lands under the jurisdiction of the Bureau of Land Management.

B. Environmental Considerations:

1. The aesthetic values of the site and surrounding area are of prime importance. The Contractor shall take all care necessary to preserve all plant life and other natural features. No surface damage outside the staked area shall occur. Any surface damage outside the staked area shall be corrected by the Contractor at his expense. Any damage to existing State, County, or local roads, used to transport materials to the project, shall be corrected by the Contractor at his expense.

2. No waste fluids from equipment (such as fuel, oil, grease, or antifreeze) shall be drained

04/24/2026 01009-3 or spilled on the ground. All waste fluids shall be captured and disposed of properly offsite. If a waste fluid is accidentally spilled on the ground, the Contractor shall excavate the spill area to a depth of 12 inches below the contaminated material, remove excavated material from the worksite, and dispose of it legally offsite, at the Contractor's expense.

3. All the Contractor's vehicles and equipment shall be washed before mobilizing on the site to prevent the spread of noxious weeds.

1.07 SEQUENCING AND SCHEDULING:

A. Permitted Work Period: Work on this project can only occur after July 15th and up to November 30th during any calendar year to accommodate wildlife concerns in the vicinity. No construction will be allowed between December 1st and July 15th to accommodate large game animal winter range and nesting bird habitat.

B. Climatic Conditions: No work required under this section will be allowed when materials are frozen or excessively wet.

C. Work Schedule: The schedule shall be submitted at the pre-work conference. When requested, submit an updated schedule within 3 calendar days. As a minimum, the estimated start and completion dates shall be shown in the schedule.

1.08 PROTECTION OF EXISTING UTILITIES:

A. The Contractor is solely responsible for locating all existing underground utility installations in advance of excavating or trenching, by contacting 811, 1-800-424-5555, or Montana811.org.

The Contractor is responsible for the cost of the repair and any personal damages caused by damage to any underground utilities.

1.09 SOIL CONDITIONS:

A. The following design criteria would be included with this action:

1. Construction activities shall not be performed during periods when the soil is too wet to adequately support equipment/vehicles. If equipment/vehicles create ruts more than three inches deep, operations must cease as the soil will be deemed too wet to adequately support equipment/vehicles.

2. Where soils are disturbed and topsoil is present, topsoil shall be stripped, separated from subsoil/parent material, and stockpiled for use in reclamation.

1.10 MOBILIZATION:

A. Mobilization consists of the preparatory work and operations performed by the Contractor, including, but not limited to, those necessary for the movement of personnel, equipment, supplies, 04/24/2026 01009-4 and incidentals to the project site; for the establishment of facilities necessary for all work on the project; for premium on bonds and insurance for the Contract; for mobilization costs for subcontracted work; and for other work and operations which must be performed or costs incurred prior to beginning work on the various items on the project site.

1.11 LIVESTOCK:

Livestock may be present in the area during construction. If livestock become a hinderance to the work, contractor shall notify the Government, and the Government will remediate the issue.

PART 2 - PRODUCTS - NONE

PART 3 - EXECUTION

3.01 PROJECT MEETINGS:

A. Pre-Work Conference:

1. Notification: A pre-work conference will be held prior to the start of work. The Contractor will be notified in advance of meeting time, date, and place. The purpose will be to review required work, project drawings and specifications, construction schedules, payroll and payments, and administrative provisions of the Contract.

2. Attendance: The Contractor, subcontractors, and the people responsible for coordination of the work are required to be present at the meeting.

3. Presentation: The Contractor shall be prepared to summarize and explain procedures planned for the project and to present any required pre-construction submittals requested in the specifications.

4. If the Contractor chooses to use materials not specifically outline in the contract, they are required to provide submittal details of those materials or methods proposed to be used in construction.

B. Progress Meetings:

1. Location: Meetings shall be held at the project site weekly, or as determined by the Government.

2. Notification: Meetings may be called by either the Government or the Contractor. The request shall state who should attend and include an agenda.

C. Final Inspection:

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1. Location: Meeting shall be held at the project site, or as determined by the Government.

2. Notification: The Contractor shall notify the Government, in writing, at least 5 working days before the completion date so the Government can schedule final inspection.

3. Attendance: The Contractor shall require the superintendent to be present during this inspection.

3.02 PERMITS:

A. Obtain all permits necessary for the completion of the work. Any costs associated with these permits are included as part of the Contractor’s price as incidental costs.

3.03 WORK LAYOUT:

A. Requirements: The government will set construction stakes and monuments to give the Contractor measurements, lines, and grades necessary for the work executed under the Contract.

Survey stakes, baseline monuments, or benchmarks disturbed or removed during construction shall be reset by the Contractor at the Contractor’s expense.

3.04 CLEAN-UP AND DISPOSAL OF DEBRIS:

A. Waste Removal: The Contractor shall always keep the premises free from accumulation of waste materials or rubbish caused by his employees or work. At the completion of the work, the Contractor shall remove all such materials from the work site. The Government may remove all such materials and charge the cost of to the Contractor, if the site is left untidy.

B. Requirements: Items of debris to be removed from the site, but not designated as salvageable items for the Government, shall become the property of the Contractor. Transport and disposal of materials offsite in a legal manner and payment of disposal fees required is the responsibility of the Contractor. Burying waste materials, other than waste rock or gravel, or burning materials resulting from demolition or any construction operations is not permitted on the site.

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PART 4 - MEASUREMENT AND PAYMENT

4.01 METHOD OF MEASUREMENT

A. Units: The work described in this section under Part 1 - GENERAL, 1.10 MOBILIZATION will be measured and paid for by Lump Sum of Mobilization. Progress payments will be made as follows:

1. When 5% of the original contract amount is earned from other bid items, 50% of the amount bid for mobilization or 5% of the original contract amount, whichever is lesser, will be paid.

2. When 40% of the original contact amount is earned from other bid items, 100% of the amount bid for mobilization or 10% of the original contract amount, whichever is lesser, will be paid.

3. Upon completion of work for the project, payment of the amount bid for mobilization more than 10% of the original contract amount will be paid.

4. The total sum of all payments for this item shall not exceed the original contract amount bid for mobilization, although the contractor may have shut down the work on the project or moved equipment away from the project and then back again.

All other work described in this section will not be measured for payment.

4.02 BASIS OF PAYMENT

A. Payment:

1. Prices and payment will be full compensation for the work described in the Mobilization portion of this section.

2. No direct payment for any other work described under this section will be made.

Consideration for these other items shall be included in the bid price for other scheduled items of the Contract.

Payment for Mobilization will be made under:

Pay Item Pay Unit 01009(1) Mobilization Lump Sum

END OF SECTION 01009

2026 Phillips Reservoirs CLEARING AND GRUBBING 04/28/2026 02231-1

DIVISION 2 – SITEWORK SECTION 02231 – CLEARING AND GRUBBING

1.01 SUMMARY:

A. Section Includes: Clearing and removal of all trees, shrubs, all other woody vegetation, and grubbing of stumps, roots, and debris; disposal of unutilized materials; and other incidental work related to preparing the site for later use.

1.02 DEFINITIONS:

A. Clearing: Clearing shall consist of the felling, trimming, and cutting of trees, shrubs, and other woody vegetation into sections and satisfactory disposal and removal, including down timber, snags, brush, and rubbish occurring in the areas to be cleared.

B. Grubbing: Grubbing shall consist of the removal and disposal of below-surface stumps, roots larger than 1-inch in diameter, and matted roots from the designated grubbing areas.

1.03 PROJECT/SITE CONDITIONS:

A. Work Limits: Area to be cleared and grubbed will be the entire upstream slope of the dam embankment at Flintstone Reservoir.

B. Burning of Slash: Shall not be permitted.

C. Landscape Preservation: Protect vegetation outside the work limits from injury. Existing trees and shrubs beyond the dam embankment shall not be disturbed or damaged.

PART 2 - PRODUCTS – NONE

PART 3 - EXECUTION

3.01 CLEARING:

A. Requirements: Clear trees, stumps, roots, brush, and other vegetation in the areas to be graded.

Perform all clearing in a safe, prudent, and lawful manner and only within the construction limits indicated on the drawings and staked in the field.

3.02 GRUBBING:

A. Requirements: Material to be grubbed shall be removed to a depth of not less than 18 inches below the original surface level of the ground in areas indicated as construction areas under this

2026 Phillips Reservoirs CLEARING AND GRUBBING 04/28/2026 02231-2 contract. Depressions made by grubbing shall be filled with approved material and compacted to make the surface conform with the original adjacent surface of the ground.

3.03 TOPSOIL REUSE:

A. Do not use topsoil removed by stripping for backfill or constructing embankments.

3.04 DISPOSAL:

A. Requirements: Dispose of all trees onsite in a slash pile at no additional cost to the Government.

Locations of slash piles are to be approved by the Contracting Officer. Trees will have their limbs removed and will be cut into 5 foot or shorter sections. Burning will not be permitted.

PART 4 - PAYMENT – NONE

PART 4: MEASUREMENT AND PAYMENT

4.01 METHOD OF MEASUREMENT

A. Units: The work described in this section will not be measured for payment.

4.02 BASIS OF PAYMENT

A. Payment: No direct payment for the work described under this section will be made.

Consideration for this item will be included in the bid price for 02910(1) Site Clearing and Restoration.

END OF SECTION 02231

2026 Phillips Reservoirs RIPRAP 04/27/2026 02275-1

DIVISION 2 – SITEWORK SECTION 02275 - RIPRAP

PART 4 - GENERAL

4.02 SUMMARY:

A. Section Includes: Stockpiling and reusing of on-site riprap. Removal and disposal of on-site geotextile fabric.

4.03 DEFINITIONS:

A. Riprap: Existing on-site riprap consists of glacial rock/field stone ranging in size from 6 inches to 36 inches or greater in diameter.

4.04 LOCATIONS:

A. Riprap: Existing on-site riprap is located within, along the sides of, and below the existing headcut spillway at Flintstone Reservoir.

B. Geotextile Fabric: Existing on-site geotextile fabric is located within and along the sides of the existing headcut spillway at Flintstone Reservoir.

PART 5 - PRODUCTS -NONE

PART 6 - EXECUTION

6.02 STOCKPILE RIPRAP:

A. Gather and stockpile riprap to be reused at the downstream end of the rebuilt spillway.

1. Scalp soil, fines, and debris from riprap prior to stockpiling by means of a rock bucket, grizzly deck, or trommel screen.

6.03 PLACING

A. Subgrade Preparation:

1. Excavate, fill, or grade foundation soils in accordance with Section 02300 so riprap limits are as indicated on the contract drawings or as directed by the Government.

B. Erosion-control riprap rock need not be hand-placed or compacted but shall be handled and dumped to avoid material segregation. Riprap shall be placed with an average depth as specified on the contract drawings. Riprap shall be placed consistently and evenly.

2026 Phillips Reservoirs RIPRAP 04/27/2026 02275-2

C. Dump and smooth by moving rocks into position so that material, when in place, is stable.

D. Leave no unfilled spaces within slope protection.

E. Any unused riprap remaining after spillway is completed is the property of the Government and shall be stockpiled on site at a location specified by the Government.

6.04 REMOVAL AND DISPOSAL OF GEOTEXTILE FABRIC:

A. Remove and dispose of all geotextile fabric material, both buried and exposed, located within the extents of the spillway.

B. The removed geotextile fabric material shall become the property of the Contractor. Transport and dispose of the material offsite in a legal manner. Payment of disposal fees is the responsibility of the Contractor.

C. Burying or burning of waste materials resulting from demolition or any construction operation is not permitted on site.

PART 4: MEASUREMENT AND PAYMENT

4.01 METHOD OF MEASUREMENT:

A. Units: The work described in this section will be measured for payment by Lump Sum of existing on-site riprap to be salvaged, scalped, stockpiled, and installed, and existing on-site geotextile fabric to be removed and disposed of off-site.

4.02 BASIS OF PAYMENT:

D. Payment: Prices and payment will be full compensation for the work described in this section.

Payment will be made under:

Pay Item: Pay Unit:

02275(1) Riprap Lump Sum

END OF SECTION 02275

2026 Phillips Reservoirs EARTHWORK 04/27/2026 02300-1

DIVISION 2 - SITEWORK SECTION 02300 – EARTHWORK

PART 1 - GENERAL

1.01 SUMMARY:

A. Description of Work: Excavation and embankment repair at two existing reservoir locations, with excavated material being used for embankment and spillway repair as shown on the drawings and in the Work Data Sheet.

1. Dewater as required to complete work.

1.02 SECTION REQUIREMENTS:

A. Unauthorized excavation consists of excavation below subgrade elevations or beyond indicated lines and dimensions without direction by Government. Unauthorized excavation, as well as remedial work directed by Government, shall be without additional compensation.

1.03 PROJECT/SITE CONDITIONS:

A. Final excavation lines will be determined by the Government in the field based on the conditions encountered and may not be the same as estimated excavation lines shown on the contract drawings.

PART 2 - PRODUCTS

2.01 MATERIALS:

A. Compaction Water: The Contractor may use water from the adjacent reservoir to achieve proper compaction of embankment.

B. Waste Material: Waste material is defined as brush, trees, stumps, frozen lumps, non-plastic silt, and oversized rocks. Oversized rocks are of such size and shape that will interfere with the uniform placement of earth fill materials in layers of specified thickness. Oversized rocks may be used as riprap.

C. Topsoil: Topsoil material is the material which will sustain plant growth and includes sod, roots, and other small vegetative matter which can be uniformly placed to a thickness of 3 inches without protruding from the finished grade.

D. Permeable Material: Sand, gravel, and rock.

E. Common Excavation: Materials to be removed from excavation, except igneous, metamorphic, and sedimentary rock which cannot be excavated without blasting, will be

04/27/2026 02300-2 considered common excavation. Common excavation includes rip-able material. Material shall be considered rip-able if the Contractor is able to rip material with a rear-mounted, heavy-duty, single-tooth, ripping attachment mounted on a crawler tractor having a power rating of at least 195 net horsepower.

F. Embankment: Embankment materials shall be free of topsoil and waste material.

Excavation required for embankment pay quantities shall be subject to the same material requirements as common excavation.

1. Embankment Material: Shall be obtained from common excavation, or from approved borrow areas. Material from excavation shall be used unless it contains ice or frozen earth, debris, high moisture content, or is specified in other sections to be replaced. Materials removed in clearing and grubbing shall not be used in backfill or embankment.

G. Muck Excavation: Any muck excavation that may be necessary to this project will be minor and is considered incidental to the excavation work.

PART 3 - EXECUTION

3.01 EXAMINATION:

A. Verify Conditions:

1. Prior to placing material in any section of the embankment, verify that the foundation for that portion has been cleared, stripped and water conditioned.

2. Scarify soil foundation areas so that the surface will bond and compact with the first layer of fill. Scarify by ripping and disking material 3 to 6 inches in depth, as determined by the Government, so that no smooth surfaces remain.

3. Condition the foundation surface and previous lift surfaces to uniform water content prior to placing fill. Pay particular attention to edges of fill against sloping ground and against abutment surfaces.

4. Do not allow water to accumulate on fill surfaces.

5. Do not place frozen materials, nor place fill on frozen ground.

6. Do not place fill below water.

7. No earthwork is allowed when materials are excessively wet.

3.02 EXCAVATION:

A. Clearing, Stripping, and Grubbing: The area to be excavated shall be:

1. Cleared and grubbed of waste material as per Section 02231 – CLEARING AND GRUBBING of these Specifications.

2. Stripped of topsoil, with topsoil deposited in stockpiles at designated locations. Strip the embankment foundation area, borrow areas and all areas to receive fill to a minimum

04/27/2026 02300-3 depth of 6 inches and as required to remove all organic soils, vegetative matter, roots, and other perishable, loose or objectionable material. Perform stripping operations in a man-ner to conserve all topsoil that contains organics.

B. Excavate: Excavate according to the lines and grades shown on the drawings, or written field clarifications.

C. Common excavation material will be measured in the original space occupied. This in-cludes:

1. Excavated material from designated borrow areas and cut spillway which is placed di-rectly in dam embankment and spillway.

2. Excavated material designated and placed to waste.

3. Excavated material which is suitable for placement in dam embankments but authorized to be placed in temporary stockpiles.

4. Excavated material placed directly for repairs to dam embankments are considered inci-dental to this contract and is not subject to separate payment.

D. Suitable excavated materials shall be placed directly in required embankments, or if author-ized, placed in temporary stockpiles, and later placed in the embankment. The Contractor shall use care not to disturb existing vegetation in natural spillways or sod watercourse areas below excavated spillways.

E. Required excavation lines shown on the drawings are the final or actual lines unless other-wise directed by the Government. Final quantities may be higher or lower than those esti-mated in the Bid Schedule.

F. Backfill unauthorized excavations, excessive soil excavations, and excavations for Contrac-tor convenience with approved materials as determined by the Government, at no additional cost to Government.

G. Take precautions to preserve, in a sound condition, the material below and beyond the lines of all excavations.

H. Perform operations so that the excavations will yield as much suitable material for construc-tion purposes as practicable.

I. Reuse, as much as is practicable, all suitable materials from required excavation in the per-manent construction.

J. Water-condition materials that are too dry for immediate compaction. Water conditioning is incidental to the work.

K. Level and trim waste piles to reasonably regular lines, and slope to drain. Finished slopes shall be no more than 3H:1V.

3.03 PREPARATION:

A. Water Control: Consists of dewatering the reservoir and other water control measures necessary to complete the Work in accordance with the Contract Documents. Includes all

04/27/2026 02300-4 design, equipment, facilities (including, but not limited to pumps, hoses, trenches, dikes, wells, sediment control), and operation required to maintain excavations and work areas free from water. This item also includes removal of dewatering facilities upon completion of construction. The Contractor is responsible for designing and maintaining all construction water control features to prevent damage to the Work. Water will be controlled on an as needed basis. Dewatering is considered incidental to the project and shall be included in the bid price of other items in the contract.

B. Maintain exposed foundation surfaces in a moist condition (not saturated). Use watering equipment as necessary to maintain the water content of the foundation soils near optimum for compaction. Scarify or otherwise roughen all exposed temporary cut slopes to facilitate infiltration of water.

C. Scarify fill slopes and foundation surfaces equal to or flatter than 2.5H:1V (horizontal to vertical) so that the surface will bond and compact with the first layer of fill. Scarify by ripping and discing material 3 to 6 inches in depth, as determined by the Government, so that no smooth surfaces remain. Moisture condition as necessary to meet requirements of adjacent fill.

D. Condition the foundation surface and previous lift surfaces to a uniform water content prior to placing layers of fill.

E. Grade areas to receive fill to the lines and grades shown prior to fill placement.

3.04 PLACEMENT:

A. General: Construct dam embankments and spillways to the lines and grades shown on the drawings, subject to:

1. The use of suitable materials as specified in these specifications.

2. The construction of each lift in a continuous, approximately horizontal layer for the full length and width of the dam or spillway embankment. Lifts shall be placed parallel to the axis of the embankment.

3. Maintain lift surfaces in a moist and roughened condition.

B. Embankment:

1. Spread materials in uniform layers not to exceed 6 to 8 inches in loose thickness.

2. Travel of rubber-wheeled earth moving equipment shall be distributed evenly over the entire width of the embankment to obtain full and complete compaction of each layer.

a. Over compaction, which causes lenses to develop, should be avoided. Should lenses develop, the Contractor shall scarify these areas prior to placing the next lift of materials.

3. Watering: Distribute water uniformly throughout each lift of material as required to maintain moisture levels to achieve optimum compaction.

04/27/2026 02300-5

4. Permeable materials shall not be used in the embankment.

5. Successive loads of material shall be placed to produce a distribution of material throughout the embankment that is free from lenses, pockets, streaks, or layers of material differing substantially in texture or gradation from surrounding material.

C. Compaction: Compaction of embankment shall be accomplished with uniform distribution of rubber-wheeled earth moving equipment as described above to achieve 95% of maximum dry density.

D. Placement of Topsoil: After excavation and construction of the embankment is complete, the stockpiled topsoil shall be replaced as per Section 02910 -RESTORATION AND TOPSOILING of these Specifications.

3.04 FIELD QUALITY CONTROL:

L. Embankment Compaction: Compaction of embankment shall be achieved by routing equip-ment as described above. The Contractor will provide evenly distributed equipment passes over the entire width of embankment as required to obtain optimum uniform compaction.

PART 4 - MEASUREMENT AND PAYMENT

4.1 METHOD OF MEASUREMENT:

Units: The work described in this section will be measured and paid for by Cubic Yards of Com-mon Excavation and Embankment as computed by the average end area method, to the neat line quantities required by the contract drawings. No separate payment will be made for over excava-tion and backfill beyond the lines specified in the drawings, demolition excavation quantities and backfill quantities below the specified embankment subgrade excavation lines, dewatering the excavation, drying or wasting excavated material too wet for reuse, watering operations, clearing and grubbing, and topsoil removal and replacement.

4.2 BASIS OF PAYMENT:

Payment: Prices and payment will be full compensation for the work described in this section.

Payment will be made under:

Pay Item: Pay Unit:

02300(1) Common Excavation Cubic Yards 02300(2) Embankment Cubic Yards

END OF SECTION 02300

2026 Phillips Reservoirs EROSION CONTROL MAT 04/27/2026 02350-1

DIVISION 2 – SITEWORK SECTION 02350 - EROSION CONTROL MAT

PART 1 - GENERAL

1.01 WORK INCLUDED:

This work consists of furnishing and placing Erosion Control Mat, comprised of Tied Concrete Block Mat (TCBM), in accordance with this specification and conforming with the lines, grades, design, and dimensions shown on the Drawings.

Note: Topsoil layer and perennial seed mix shall be placed before installation of Erosion Control Mat.

1.02 SUBMITTALS:

A. TCBM manufacturer’s specifications that include at a minimum, properties as found in Table

02350-1:

Table 02350-1

TCBM Minimum Requirements & Characteristics Property Test Method Requirement

Percentage Open Area (POA) N/A 30% min.

Geogrid Tensile Strength ASTM D6637 2055 lbs./ft biaxial strength

Shear Tolerance ASTM D6460 24 lbs./sf Min.

Velocity Tolerance ASTM D6460 30 ft/sec Min.

Block Size N/A 6.5” x 6.5” x 2.25” Material Weight N/A 10 bs./sf

B. TCBM submittal shall include manufacturer's test results for the properties listed in Table

02350-1.

C. Manufacturer information:

1. Name and address.

2. Evidence of manufacturer experience.

3. Descriptive documentation of the manufacturer’s quality control program.

D. Submit Shop Drawings that show mat sizes, orientations, and square feet of TCBM.

04/27/2026 02350-2

PART 2 - PRODUCTS

2.01 MATERIALS:

A. TCBM Erosion Control Mat shall conform to the following standards:

1. Blocks: Blocks shall be manufactured with concrete conforming to the cement requirements of ASTM C150 and to the aggregate requirements of ASTM C33. Blocks shall have a minimum weight of 3 lbs. per block and placed no further than 2 in. apart.

Material weight per square foot shall not exceed 10 lbs. Concrete block size: 6.5” x 6.5” x 2.25” with 1.5” spacing between the blocks. Blocks shall have a 2.25” profile, a flat-top pyramid shape, and a coarse finish without protrusions. Concrete shall have a minimum compressive strength requirement of Table 02350-2 and certified by a third party.

Table 02350-2

Concrete Compressive Strength Requirements Age Required Compressive Strength

7 – day 5000 psi 14 - day 6000 psi 28 - day 6900 psi

2. Polypropylene Bi-Axial Geogrid: The interlocking geogrid shall be an open knitted fabric composed of high tenacity, multifilament polypropylene yarns knitted and coated in tension with an acrylic based coating which is designed to resist degradation in environments with exposure to water and low pH (<4 pH) and high pH (>9 pH). Carbon black UV inhibitor shall be blended into the extruded yarns at a rate no less than 0.8% by weight. When combined with the revetment mat, this will yield a high tenacity, low elongating, and continuous filament polypropylene geogrid that is embedded within the base of the concrete blocks. Ensure the geogrid meets the requirements of Table 02350- 3.

04/27/2026 02350-3

Table 02350-3 Polypropylene Bi-Axial Geogrid Requirements

Property Test Requirement Mass/Unit Area ASTM D5261 6.5 oz/yd² Aperture Size Measured 1.4-inch x 1.4-inch

Ultimate Wide Width Tensile Strength (MD x CMD)

ASTM D6637 2,055 lb/ft

Elongation at Ultimate Tensile Strength (MD x CMD)

ASTM D6637 6%

Wide Width Tensile Strength @ 2% (MD x CMD)

ASTM D6637 822 lb/ft

Wide Width Tensile Strength @ 5% (MD x CMD)

ASTM D6637 1,640 lb/ft

Tensile Modulus @ 2% (MD x CMD)

ASTM D6637 41,100 lb/ft

Tensile Modulus @ 5% (MD x CMD)

ASTM D6637 32,800 lb/ft

3. Underlayment Materials:

- Triple Underlayment material shall be included within the rolls – System underlayment material is required to be packaged with the TCBM rolls to ensure proper installation.

- A four-layer system shall include 1) Concrete block mat, 2) Weave, 3) Turf Reinforcement Mat, and 4) Erosion Control Blanket. The underlayment materials shall be packaged within the roll of the TCBM.

- Weave: This is a woven, white polypropylene netting that provides added strength and support to the underlayment. See Table 02350-4.

Table 02350-4 Weave Requirements

Index Property Value GSM 118 g/m² (-3~ +3)

Density 62 x 24 Picks/10cm (+/- 2) Warp Strength ≥ 350 N/5cm

Warp Elongation 20% – 50% Weft Strength ≥ 280 N/5cm

Weft Elongation 20% - 50% Warp Shrinkage ≤ 7% Weft Shrinkage ≤ 9%

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- Turf Reinforcement Mat (TRM): A permanent non-degradable TRM, shall consist of 100% post-consumer recycled polyester (green or brown bottles) with 80% five-inch fibers or greater fiber length. It is of consistent thickness with fibers evenly distributed throughout the entire area of the TRM. The top and bottom of each TRM is covered with heavy duty polypropylene net. Fibers are tightly crimped and curled to allow fiber interlock, and to retain 95% memory of the original shape after loading by hydraulic events. Fibers have a specific gravity greater than 1.0; ensuring the blanket will not float during hydraulic events. TRM shall meet Federal Government Executive Order initiatives for use of products made from, or incorporating, recycled materials. TRM shall be manufactured in the U.S.A., and the fibers shall be made from 100% recycled post-consumer goods. See Table 02350-5.

Table 02350-5

TRM Requirements Index Property Test Method Value

Thickness ASTM D6525 0.294 in Light Penetration ASTM D6567 57%

Resiliency ASTM D6524 86% Mass per Unit Area ASTM D6566 0.50 lb/yd²

MD – Tensile Strength Max. ASTM D6818 295.2 lb/ft TD – Tensile Strength Max. ASTM D6818 194.4 lb/ft

MD – Elongation ASTM D6818 32.2% TD – Elongation ASTM D6818 40.8%

Swell ECTC Procedure 8% Water Absorption ASTM D1117/ECTC 33.8% Specific Gravity ASTM D792 1.21

UV Stability ASTM D4355 (1,000 hr) 80% minimum Porosity Calculated 97.5%

Bench-Scale Rain Splash ECTC Method 2 SLR = 5.86 @ 2 in/hr Bench-Scale Rain Splash ECTC Method 2 SLR = 5.00 @ 4 in/hr Bench-Scale Rain Splash ECTC Method 2 SLR = 6.33 @ 6 in/hr

Bench-Scale Shear ECTC Method 3 2.41 lb/ft² @ 0.5 in soil loss Germination Improvement ECTC Method 4 432%

SLR is the Soil Loss Ratio, as reported by NTPEP/AASHTO.

Bench-Scale index values should not be used for design purposes.

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- Erosion Control Blanket (ECB): ECB shall consist of a specific cut of naturally seed-free curled hardwood excelsior with 80% six-inch fibers or greater fiber length. It shall have consistent thickness with fibers evenly distributed throughout the entire area of the blanket. The top and bottom of each blanket shall be covered with degradable polyethylene netting. See Table 02350-6.

Table 02350-6

ECB Requirements Index Property Test Method Value

Thickness ASTM D6525 0.418 in Light Penetration ASTM D6567 34.6%

Resiliency ASTM D6524 64% Mass per Unit Area ASTM D6475 0.57 lb/yd²

MD – Tensile Strength Max. ASTM D6818 127.0 lb/ft TD – Tensile Strength Max. ASTM D6818 50.9 lb/ft

MD – Elongation ASTM D6818 28.64% TD – Elongation ASTM D6818 29.84%

Swell ECTC Procedure 89% Water Absorption ASTM D1117/ECTC 199%

Bench-Scale Rain Splash ECTC Method 2 SLR = 6.84 @ 2 in/hr Bench-Scale Rain Splash ECTC Method 2 SLR = 7.19 @ 4 in/hr Bench-Scale Rain Splash ECTC Method 2 SLR = 7.56 @ 6 in/hr

Bench-Scale Shear ECTC Method 3 2.6 lb/ft² @ 0.5 in soil loss Germination Improvement ECTC Method 4 645%

Weight is based on dry a fiber weight basis at time of manufacture. Baseline moisture content of Great Lakes Aspen excelsior is 22%.

SLR is the Soil Loss Ratio, as reported by NTPEP/AASHTO.

Bench-Scale index values should not be used for design purposes.

4. Cover the TCBM or otherwise protect it during periods of storage to protect against degradation of the backing material as recommended by the manufacturer.

5. Mats will be rolled for shipment and packaged with lifting straps. Upon delivery, rolls may be left exposed for up to 30 days. If exposure exceeds 30 days, cover or tarp the rolls to minimize UV exposure.

6. All mats are to be inspected upon delivery. Assure that all units are sound and free of defects that would interfere with the proper placing of the unit or impair the strength or performance of the construction.

7. Chipping or missing concrete resulting in a weight loss exceeding 15% of the average weight of a concrete unit is grounds for rejection by the Government. Replace, repair, or patch the damaged areas per the manufacturer's recommendations.

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2.02 PERFORMANCE:

A. Full-Scale laboratory testing performed by an independent 3rd party testing facility with associated engineered calculations certifying the hydraulic capacity of the TCBM meets the following requirements:

Test Tested Value Bed Slope Soil

Classification Limiting Value

ASTM 6460 Shear Stress Tolerance

30% Sandy Loam

(USDA)

24 lb./ft²

ASTM 6460 Velocity Tolerance

20% Loam

(USDA)

30 t/sec

2.03 PRODUCTS:

A. Acceptable product for TCBM shall be Flexamat Plus or approved equal.

2.04 ALTERNATIVE PRODUCTS:

A. Such products shall be pre-approved by the CO prior to bid date. Alternative product packages must be submitted to the CO a minimum of 15 days prior to bid date. Submittal packages for alternate products must include, as a minimum, the following:

a. Alternate Product Properties: Product must be comprised of materials as detailed in Part 2: PRODUCTS: 2.01 MATERIALS of this specification, including both in composition, underlayment layers, and performance requirements.

b. Full-Scale laboratory testing performed by an independent 3rd party testing facility with associated engineered calculations certifying the hydraulic capacity of the proposed TCBM meets the performance requirements listed in Part 2:

PRODUCTS: 2.02 PERFORMANCE of this specification.

c. A list of 15 comparable projects in terms of project size, application, and material dimensions in the United States, where the results of the specific alternative material’s use can be verified and reviewed for system integrity and sustained after a minimum of 10 years of service life.

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PART 3 - EXECUTION

3.01 AREAS TO RECEIVE SPILLWAY SLOPE PROTECTION

A. Place TCBM erosion control mats as indicated in these Specifications, on the Contract

Drawings, and staked in the field. Replace topsoil and distribute perennial seed mix prior to installation of the erosion control mats.

3.02 EQUIPMENT

A. Provide the proper equipment to place the mat that will not damage the material and minimize disturbance of topsoil.

3.03 PLACING

A. Subgrade Preparation and Construction:

1. Excavate, fill, and grade foundation soils in accordance with Section 02300. TCBM limits are as indicated on the Contract Drawings or as directed by the Government.

2. All subgrade surfaces prepared for placement of erosion control mats shall be smooth and free of all rocks, stones, sticks, roots, and other protrusions or debris of any kind that would prevent intimate contact between the block and the subgrade. No individual block shall be raised more than ¾ inch above the adjoining blocks.

3. The prepared surface shall provide a firm unyielding foundation for the mats with no sharp or abrupt breaks in the grade. The subgrade shall be graded into a trapezoidal shape as shown in the Contact Drawings.

4. Place topsoil layer uniformly over all subgrade surfaces that will receive erosion control mats.

5. Uniformly distribute perennial seed mix onto the prepared topsoil subgrade before installation of the erosion control mat.

6. Provide a minimum of 18-inch-deep concrete mat embedment anchor trench at all edges exposed to concentrated flows, or as required by manufacturer. Provide a minimum of 12-inch-deep concrete mat embedment anchor trench at all exterior edges, or as required by manufacturer. All anchor trenches shall be backfilled with cohesive soils and firmly compacted. See Drawings for further installation specifications.

7. Areas that require mat seams parallel to concentrated flows are required to install mats with interlocking geogrid and underlayment extension on the long edge for overlapping and anchoring the adjacent mat. Extensions shall be comprised of the mat’s interlocking geogrid and all three layers of the TCBM underlayment system.

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8. Provide fastening or anchoring as recommended by the manufacturer or the Government for the site conditions. See manufacturer requirements for anchoring and fastening instructions.

B. Install erosion control mats according to manufacturer’s specified installation details.

PART 4: MEASUREMENT AND PAYMENT

4.1 METHOD OF MEASUREMENT:

A. Units: The work described in this section will be measured for payment by Square Yards of

TCBM.

4.2 BASIS OF PAYMENT:

A. Payment: Prices and payment will be full compensation for the work described in this section. Payment will be made under:

02350(1) Erosion Control Mat Square Yards

END OF SECTION 02350

2026 Phillips Reservoirs RESTORATION AND TOPSOILING 04/28/2026 02910-1

DIVISION 2 – SITEWORK SECTION 02910 - RESTORATION AND TOPSOILING

1.01 WORK INCLUDED:

A. Stripping and stockpiling of topsoil.

B. Spreading and grading of topsoil in preparation for seeding.

C. Seeding.

D. Cleanup of Area.

1.02 SUBMITTALS:

A. Submit seed mix documentation including the following: Certification of Weed Free status;

Seed mix composition; Percentage of Pure Live Seed (PLS).

PART 2 - PRODUCTS

2.01 TOPSOIL:

Strip topsoil from within the limits of disturbance to a depth of 6 inches or as shown on the Contract Drawings. Remove all construction debris.

2.02 SEED:

A. Seed: Fresh, clean, dry, new-crop seed complying with Associate of Official Seed Analysts (AOSA) “Rules for Testing Seeds” for purity and germination tolerances. Must be certified weed free.

B. Quality, State Certified: State-certified seed of grass species as listed below for solar exposure.

C. See Table 02910-1: Seed Mix.

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Table 02910-1: Seed Mix

SCIENTIFIC

NAME

COMMON

NAME

VARIETY1 %

COMP

Drilled Seeding rate

Broadcast Seeding rate

GRASSES:

Pascopyrum smithii

Western wheatgrass

Rosana 40% 9.6 PLS lbs./acre

19.2 PLS

lbs./acre

Disticlis spicata Inland Saltgrass VNS2 10% 2.0 PLS lbs./acre

4.0 PLS

lbs./acre

Spartina pectinata

Prairie Cordgrass Red River 20% 3.6 PLS lbs./acre

7.2 PLS

lbs./acre

Calamovilfa longifolia

Prairie Sandreed

Goshen 20% 3.2 PLS lbs./acre

6.4 PLS

lbs./acre

FORBS:

Achillea millefolium

Western yarrow Great Northern

10% 0.1 PLS

lbs./acre

0.2 PLS

lbs./acre

TOTAL: 18.5 PLS

lbs./acre

37.0 PLS

lbs./acre

1 Other cultivars adapted to the area are acceptable.

2 Variety Not Specified

D. Suggested local vendor: First Creek Seeds located near Saco, MT; (406) 527-3334.

PART 3 - EXECUTION

3.01 STRIPPING:

Strip and stockpile all areas to be excavated for borrow and waste areas and all areas that are to receive fill.

3.02 PLACING TOPSOIL:

A. Placing topsoil layer:

1. Do not spread topsoil when the ground or topsoil is frozen, excessively wet, or otherwise in a condition detrimental to the Work. Replace the same 6 inches of topsoil that was previously stockpiled during the excavation. Lightly scarify designated surfaces prior to the spreading operation. After placement is completed, finish the topsoil surface to a uniform surface.

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3.03 SEEDING:

A. Sow seed with seed drill or spreader. Do not broadcast or drop seed when wind velocity exceeds 5 mph.

1. If seed drill method is used, seed at a shallow depth as per seed vendor recommendations.

2. If broadcast seeding method is used, evenly distribute seed by sowing equal quantities in two directions at right angles to each other. Note that broadcast seeding rate is twice that of drilling seed rate.

3. Do not use wet seed or seed that is moldy or otherwise damaged.

B. Seeding rate shall be as per Table 02910-1: Seed Mix.

C. Areas to be reseeded:

1. Under erosion control mats.

2. Borrow areas, disturbed areas, all newly built spillway and dam embankments, built-up and rebuilt dam crests, and all rebuilt dam embankments. Upstream dam embankments shall be reseeded only above spillway crest elevation.

3. Coordinate installation of TCBM erosion control mat with the Government to ensure proper placement and timing of topsoil and seed prior to mat installation.

3.04 CLEANUP OF AREA:

Upon completion of the Work, clear the entire project site of all debris. Finish ground surfaces to smooth, uniform slopes and present in a neat, workmanlike appearance. Repair any utilities, structures, landscaping, grass areas, etc. that were damaged due to negligence of the CONTRACTOR at the CONTRACTOR'S expense, and as directed by the Government.

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PART 4 - PAYMENT – NONE

PART 4: MEASUREMENT AND PAYMENT

4.01 METHOD OF MEASUREMENT

A. Units: The work described in this section will be measured for payment by Lump Sum.

4.02 BASIS OF PAYMENT

A. Payment: Prices and payment will be full compensation for the work described in this section.

Payment will be made under:

02910(1) Site Clearing and Restoration Lump Sum

END OF SECTION 02910

2026 Phillips Reservoir 04/28/2026 Page 1 WORK DATA SHEET

WORK DATA SHEET

2026 PHILLIPS RESERVOIRS

Government Estimated Excavation and Embankment Volumes:

Section 02300 – Earthwork Section 02350 – Erosion Control Mat

Reservoir

Flintstone

Hump

TOTAL:

Common Excavation (CY)

Embankment (CY)

Erosion Control Mat (SY)

TOTAL ESTIMATED COMMON EXCAVATION QUANTITY: 1750 CY

TOTAL ESTIMATED EMBANKMENT QUANTITY: 2150 CY

TOTAL ESTIMATED EROSION CONTROL MAT: 730 SY

TOTAL ESTIMATED ON-SITE RIPRAP AT FLINTSTONE TO REUSE: 45 CY

B. Requirements: Allow at least 10 working days for review. Submittals shall be delivered to the Contracting Officer or appointed Contracting Officer’s Representative.