Attachment 4_FSSS Specifications.pdf

Park Lake Dam Rehabilitation Helena-Lewis and Clark National Forest

FOREST SERVICE

SUPPLEMENTAL SPECIFICATIONS

PARK LAKE DAM REHABILITATION

SECTION 13, TOWNSHIP 8 NORTH, RANGE 5 WEST

46.444272 N, 112.171952 W

JUNE 2024

HELENA-LEWIS AND CLARK NATIONAL FOREST

HELENA RANGER DISTRICT

Chris J. Brown 06/27/24

Expires 6/30/2026

SUPPLEMENTAL SPECIFICATION LIST OF APPENDICES

APPENDIX A – Geotechnical Data APPENDIX B – Obliteration Details

Forest Service Supplemental

Specification No.

SUPPLEMENTAL SPECIFICATION TITLE

TABLE OF CONTENTS

Preface FSSS 101 Terms, Format, and Definitions FSSS 102 Bid, Award, and Execution of Contract FSSS 103 Scope of Work FSSS 104 Control of Work FSSS 105 Control of Material FSSS 106 Acceptance of Work FSSS 107 Legal Relations and Responsibility to the Public FSSS 108 Prosecution and Progress FSSS 109 Measurement and Payment FSSS 151 Mobilization FSSS 152 Construction Survey and Staking FSSS 153 Contractor Quality Control FSSS 155 Schedules for Construction Contracts FSSS 156 Public Traffic FSSS 157 Soil Erosion and Sediment Control FSSS 201 Clearing and Grubbing FSSS 204 Excavation and Embankment FSSS 211 Roadway Obliteration FSSS 251 Riprap FSSS 262 Compaction Grouting FSSS 604 Manholes, Inlets, and Catch Basins FSSS 619 Fences, Gates, and Cattle Guards FSSS 624 Topsoil FSSS 625 Turf Establishment FSSS 626 Plants, Trees, Shrubs, Vines, and Groundcovers FSSS 630 Control of Water FSSS 640 Outlet FSSS 704 Soil FSSS 705 Rock

Preface

Delete all but the first paragraph and add the following:

The Forest Service, US Department of Agriculture has adopted FP-14 for construction of this project.

101 – Terms, Format, and Definitions

Add the following paragraph to Subsection 101.01:

101.01 Meaning of Terms

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

Add the following to Subsection 101.03:

101.03 Abbreviations

(a) Acronyms.

AGAR — Agriculture Acquisition Regulations

AFPA — American Forest and Paper Association

FSAR — Forest Service Acquisition Regulations

MSHA — Mine Safety and Health Administration

NESC — National Electrical Safety Code

WCLIB — West Coast Lumber Inspection Bureau

(f) Miscellaneous unit abbreviations.

MP — milepost location ppm — parts per million volume

STA — station location

Make the following changes to Subsection 101.04:

101.04 Definitions

Delete these definitions and replace with the following:

Bid Schedule — The Schedule of Items.

Bridge — A structure, including supports, erected over a depression or an obstruction such as water along a road, a trail, or a railway and having a deck for carrying traffic or other loads.

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 — Any structure with a bottom, regardless of fill depth, depth of invert burial, or presence of horizontal driving surface, or any bottomless (natural channel) structure with footings that will not have wheel loads in direct contact with the top of the structure.

Drawings — (Public Works Contracts) Design sheets or fabrication, erection, or construction details submitted to the CO by the Contractor according to FAR Clause 52.236-21 Specifications and Drawings for Construction.

Also refers to submissions and submittals.

Notice to Proceed — (Public Works Contracts) Written notice to the Contractor to begin the contract work.

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.

Solicitation— (Public Works Contracts) The complete assembly of documents (whether attached or incorporated by reference) furnished to prospective bidders.

Add the following definitions:

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.

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

Neat Line — A line defining the proposed or specified limits of an excavation or structure.

Pioneer Road — Temporary construction access built along the route of the project.

Purchaser — The individual, partnership, joint venture, or corporation contracting with the Government under the terms of a Timber Sale Contract and acting independently or through agents, employees, or subcontractors.

Protected Streamcourse — A drainage shown on the plans or timber sale area map that requires designated mitigation measures.

Road Order — An order affecting and controlling traffic on roads under Forest Service jurisdiction. Road Orders are issued by a designated Forest Officer under the authorities of 36 CFR, part 260.

Shop Drawings — (Timber and Stewardship Contracts) Referred to as “Drawings” in FP-14, include drawings, diagrams, layouts, schematics, descriptive literature, illustrations, lists or tables, performance and test data, and similar materials furnished by Purchaser to explain in detail specific portions of the work required by the contract.

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

Add Figure 101-1—Illustration of road structure terms:

Figure 101-1—Illustration of road structure terms.

102 – Bid, Award, and Execution of Contract

Delete Section 102 in its entirety.

103 – Scope of Work

Delete all but subsection 103.01 Intent of Contract and add the following:

This contract involves rehabilitation of Park Lake Dam. The project includes the following elements:

Remove the entirety of the dam down to elevation 6,340 feet NAVD 1988 at the maximum section in the valley and to the natural valley elevation along each dam abutment;

Stockpile the excavated dam embankment material onsite in windrows to dry the material and for the purposes of dam reconstruction;

Remove all unacceptable material such as unsuitable soils, large boulders and rocks, and remnants of the original wooden headwall and culvert;

Stabilize the foundation for seismic/liquefaction potential using compaction grouting within a 25-foot vertical section of the foundation to elevation 6,325 feet NAVD 1988;

Incorporate a 25-foot deep cutoff trench in the dam foundation constructed using compaction grouting for the purposes of seepage control and prevention of piping with an invert elevation in the valley center at 6,325 feet NAVD 1988;

Reconstruct the dam in-kind with a homogeneous embankment using stockpiled dam embankment material and additional suitable borrow material; Note this material with have to be blended onsite to create a homogeneous mix for final dam reconstruction;

Incorporate chimney/toe drain internal drainage system in the embankment and foundation to control embankment through seepage and foundation under seepage with the toe drain invert elevation to be just below elevation 6,339 feet NAVD 1988; Chimney/toe drain includes a dual-stage filter including washed concrete sand and gravel;

Raise the dam crest to elevation 6,373.5 feet NAVD 1988 to provide additional freeboard;

Raise the dam entrance road embankment/saddle dike to elevation 6,372 feet NAVD 1988;

Flatten the dam entrance road embankment/saddle dike downstream slope to 2.5 to 3:1 slope;

Armor the upstream dam with riprap erosion protection;

Armor the upstream road embankment/saddle dike with riprap erosion protection;

Add a passive gravel drain system and rock buttress on the road embankment/saddle dike to safely collect seepage and ensure slope stability; and, Replace existing piezometers and add new piezometers at the main dam and along the saddle dike, as well as add reservoir stage measurement capability.

Install two 25-foot-wide gates and one 16-foot-wide gate.

Construct turnaround for 24-foot-long travel trailer.

104 – Control of Work

Delete Subsections 104.01, 104.02, and 104.04.

Add the following subsection:

104.06 Use of Roads by Contractor

The Contractor is authorized to use roads under the jurisdiction of the Forest Service for all activities necessary to complete this contract when such use will not damage the roads or National Forest resources and when traffic can be accommodated safely. Commensurate with use, maintain all unpaved roads under the jurisdiction of the Forest Service.

Add the following subsection:

104.07 Restoration by Contractor

All areas disturbed by the Contractor’s operations including, but not limited to, access roads, staging areas, stockpiles, haul roads, loading operations, and disposal operations shall be ripped and restored by grading to the original contours and seeded, unless otherwise designated. During the course of the work, the Contractor shall periodically, or as directed by the CO, remove and dispose of all surplus construction materials and debris and keep the project area and public right-of-way reasonably clean. Upon completion of the work, the Contractor shall remove all temporary construction facilities, debris, and unused materials, leaving the project sites in a neat and clean condition. All debris shall be disposed of off-site in a State-licensed landfill.

105 – Control of Material

105.01 Source of Supply and Quality Requirements

Add the following:

All materials incorporated into the project shall be certified noxious weed seed free, either through visual inspection or commercial certification.

Contractor is responsible for providing the CO with any soil testing data required (e.g. standard proctor tests, gradation tests) in a timely manner so as not to delay the work.

105.02 Material Sources

105.02(a) Government-provided sources

Add the following:

Use all suitable material from the project site unless otherwise designated. Borrow sites and waste sites for excess and unsuitable material are shown in the plans.

Select Borrow. Most of the select borrow will come from the excavation of the existing dam. Additional select borrow required for the project shall come from Borrow Areas A and B shown in the Borrow and Staging Plan in the Drawings or from more distant borrow areas made available by the USFS. Prior to salvaging the material, topsoil shall be stripped from the existing dam embankment and temporarily stockpiled adjacent to the borrow area. Select borrow shall meet material classification requirements in Subsection 704.07.

105.02(c) Contractor-located sources

Add the following:

Any borrow site shall be free of noxious weeds. Prior to any borrow site development or use of materials, the borrow site shall be inspected and approved by the CO.

105.05 Use of Material Found in the Work

Delete 105.05 (a) and (b) and the last sentence of the second paragraph and substitute the following:

Materials produced or processed from Government lands in excess of the quantities required for performance of this Contract are the property of the Government. The Government is not obligated to make reimbursement for the cost of producing these materials.

106 – Acceptance of Work

Delete Subsection 106.01 and replace with the following:

106.01 Conformity with Contract Requirements

Follow the requirements of FAR Clause 52.246-12 Inspection of Construction.

References to standard test methods of AASHTO, ASTM, GSA, and other recognized standard authorities refer to the methods in effect on the date of solicitation for bids.

Perform all work to the lines, grades, cross-sections, dimensions, and processes or material requirements shown on the plans or specified in the contract.

Incorporate manufactured materials into the work according to the manufacturer’s recommendations or to these specifications, whichever is stricter.

Plan dimensions and contract specification values are the values to be strived for and complied with as the design values from which any deviations are allowed. Perform work and provide material that is uniform in character and reasonably close to the prescribed value or within the specified tolerance range. The purpose of a tolerance range is to accommodate occasional minor variations from the median zone that are unavoidable for practical reasons.

When standard manufactured items are specified (such as fence, wire, plates, rolled shapes, pipe conduits, etc., that are identified by gauge, unit mass, section dimensions, etc.), the identification will be nominal masses or dimensions. Unless specific contract tolerances are noted, established manufacturing tolerances will be accepted.

The Government may inspect, sample, or test all work at any time before final acceptance of the project. When the Government tests work, copies of test reports are furnished to the Contractor upon request. Government tests may or may not be performed at the work site. If Contractor testing and inspection is verified by the Government, the Contractor’s results may be used by the Government to evaluate work for acceptance. Do not rely on the availability of Government test results for process control.

Acceptable work conforming to the contract will be paid for at the contract unit bid price. Four methods of determining conformity and accepting work are described in Subsections 106.02 to 106.05 inclusive. The primary method of acceptance is specified in each Section of work. However, work may be rejected at any time it is found by any of the methods not to comply with the contract.

Remove, repair, or replace work that does not conform to the contract, or to prevailing industry standards where no specific contract requirements are noted. Removing, repairing, or replacing work; providing temporary traffic control; and any other related work to accomplish conformity will be at no cost to the Government.

(a) Disputing Government test results. If the accuracy of Government test results is disputed, promptly inform the CO. If the dispute is unresolved after reasonable steps are taken to resolve the dispute, further evaluation may be obtained by written request. Include a narrative describing the dispute and a proposed resolution protocol that addresses the following:

1) Sampling method;

2) Number of samples;

3) Sample transport;

4) Test procedures;

5) Testing laboratories;

6) Reporting;

7) Estimated time and costs; and

8) Validation process.

If the evaluation requires additional sampling or testing be performed, mutually agree with the Government on witnessing procedures and on sampling and testing by a third-party laboratory. Use a third-party laboratory accredited by the AASHTO accreditation program. Provide proof of the laboratory’s accreditation for the test procedures to be used. Do not use the same laboratory that produced the disputed Government test results or that produced the test results used as a basis for the dispute.

The CO will review the proposed resolution protocol and may modify it before final approval and execution.

The Government will use the approved resolution protocol test results to determine the validity of the disputed testing. If the Government test results are validated, the Contractor will be responsible for all costs associated with developing and performing the resolution protocol. If the Government test results are not validated, the Government will be responsible for all costs associated with developing and performing the resolution protocol.

If the validity of the Government test results cannot be determined, the Contractor and Government will equally share all costs associated with developing and carrying out the resolution protocol.

(b) Alternatives to removing and replacing non-conforming work. As an alternative to removal and replacement, the Contractor may submit a written request to:

1) Have the work accepted at a reduced price; or

2) Be given permission to perform corrective measures to bring the work into conformity.

The request must contain supporting rationale and documentation. Include references or data justifying the proposal based on an evaluation of test results, effect on service life, value of material or work, quality, aesthetics, and other tangible engineering basis. The CO will determine disposition of the nonconforming work.

Delete Subsection 106.02 and replace with the following:

106.02 Visual Inspection

Acceptance is based on visual inspection of the work for compliance with the specific contract requirements.

Use prevailing industry standards in the absence of specific contract requirements or tolerances.

107 – Legal Relations and Responsibility to the Public

107.05 Responsibility for Damage Claims

Delete the entire subsection.

107.10 Environmental Protection

Add the following:

Design and locate equipment repair shops, stationary refueling sites, or other facilities to minimize the potential and impacts of hazardous material spills on Government land.

Before beginning any work, submit a Hazardous Spill Plan. List actions to be taken in the event of a spill.

Incorporate preventive measures to be taken, such as the location of mobile refueling facilities, storage and handling of hazardous materials, and similar information. Immediately notify the CO of all hazardous material spills. Provide a written narrative report form no later than 24 hours after the initial report and include the following:

Description of the item spilled (including identity, quantity, manifest number, and other identifying information).

Whether amount spilled is EPA or state reportable, and if so whether it was reported, and to whom.

Exact time and location of spill including a description of the area involved.

Containment procedures.

Summary of any communications the Contractor had with news media, Federal, state and local regulatory agencies and officials, or Forest Service officials.

Description of clean-up procedures employed or to be employed at the site including final disposition and disposal location of spill residue.

When available provide copies of all spill-related clean-up and closure documentation and correspondence from regulatory agencies.

The Contractor is solely responsible for all spills or leaks that occur during the performance of this contract.

Clean up spills or leaks to the satisfaction of the CO and in a manner that complies with Federal, state, and local laws and regulations.

107.11 Protection of Forests, Parks, and Public Lands

Add the following:

Before mobilizing equipment, submit a fire plan for approval by the CO. Provide details for equipment and procedures. Acceptance of the fire plan by the CO does not relieve Contractor from implementing the fire plan.

108 – Prosecution and Progress

Delete Section 108 in its entirety.

109 – Measurement and Payment

109.02 Measurement Terms and Definitions

(b) Contract quantity (CQ).

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

Items to be measured by contract quantities will be designated on the Schedule of Items.

Add the following definition:

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

Items to be measured by actual quantities will be designated on the Schedule of Items.

(t) 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. They will not be measured individually. Items to be measured by lump sum quantities will be designated on the Schedule of Items.

Delete the following subsections: 109.06, 109.07, 109.08, and 109.09.

151 – Mobilization

Description

Add the following to the end of the last sentence:

151.01 This work also includes cleaning of all equipment used at the project site. Clean all construction equipment prior to entry on the project site and prior to leaving the project site. Wash the sides, tops, and undercarriages of all construction equipment. Remove all seeds, plants, plant fragments, dirt, and debris from the construction equipment. Clean truck beds and dump boxes hauling to the project site prior to entering the work area and prior to leaving the project site. Only equipment inspected by the Forest Service will be allowed to operate within the project area. All subsequent move-ins of equipment to the project area will be treated in the same manner as the initial move-in. This requirement does not apply to cars, pickup trucks, and other vehicles that regularly travel between the construction site and areas off the National Forest. Equipment will be considered free of soil, seed, and other such debris when a visual inspection does not disclose such material.

Disassembly of equipment, components or the need for specialized inspection tools is not required. Notify the CO in writing at least 72 hours before moving any construction equipment either onto or off of the National Forest. Notification will include an agreed upon location where the equipment will be available for inspection by the Forest Service. Inspection will be required after every cleaning. It is the Contractor’s responsibility to ensure any subcontractor trucks comply with the decontamination protocols.

The project schedule and period of performance shall be per the Contract Documents. It is the responsibility of the Contractor to schedule delivery of materials, equipment and all necessary supplies to the site, to ensure that work can be substantially completed within the specified contract time.

152 – Construction Survey and Staking

152.04 General

Add the following:

The Contractor is responsible for providing all staking or re-setting of disturbed stakes.

(a) Personnel.

Add the following:

Conduct all construction staking under the direction of a licensed professional engineer or land surveyor who is closely associated and familiar with construction staking.

152.05 Survey and Staking Requirements

Add the following after (l) Miscellaneous survey and staking.

(m) Measurement surveys. Perform all measurement surveys essential for determining payment quantities. Perform measurement surveys in conformance with the tolerances established in Table 152-1.

(n) Riprap slope tolerance. Horizontal tolerance for the riprap slopes shall be +/- 1.0 feet. Final elevations shall be +/- 0.1 feet of those shown on the Drawings. Surface elevations of rock materials will be measured at the average surface height, which is defined as the elevation midway between the lowest and highest points of the exposed rock on the surface. No rock shall deviate more than 0.5 feet from the average surface elevation.

153 – Contractor Quality Control

Delete Subsection 153.09 and add the following.

153.09. Project Submittals

At a minimum, the contractor shall provide project submittals to the CO as shown on the Submittal Log below.

Submittal requirements are listed in the Standard Specifications, Supplemental Specifications, and Drawings.

Submittal Log

Item No.

Incidental to

Pay Item(s) Description of Submittal

Type of Submittal

Requirement found in Specification No.

/Drawings

Additional Specification References

1 15101 Fire Safety and Mitigation Plan Plan FSSS 107.11

2 15101 Weed Free Equipment Material

Certification

FSSS 151

3 15101 Weed Free Material Source Certification

Material Certification

FSSS 105 FSSS 151

4 15101 Hazardous Spill Plan Plan FSSS 107.10

5 15101 Contractor Quality Control Plan Plan FP-14 153.03 FP-14 552.09

6 15101 Erosion Control Plan Plan FSSS 157.03

7 25101 Stone/Rock Salvage Plan Plan FSSS 251, FSSS 211 FSSS 705

25101, 25102, 25103

Riprap, Class 2 Material

Certification

FSSS 251, FSSS 705

26201- 26208

Compaction Grouting (Seismic Retrofit and Hydraulic Barrier)

Plans FSSS 262

10 60401 24” Standard Riser Inlet Material

Certification

FSSS 604

11 64001 6” Dia. Dual-Wall HDPE Perforated Drain Pipe

Material Certification

FSSS 640.02

12 64002 6” Dia. Dual-Wall HDPE Solid Drain Pipe

Material Certification

FSSS 640.02

70401, 70402, 70403

Filter/Bedding Gravel Layers M1, M2, and M3

Material Certification

FSSS 251, FSSS

640.02, FSSS 704.09

FSSS 105.02

14 20404 Select Borrow used as Embankment Fill

Material Certifiation

FSSS 204.11, FSSS

704.07

FSSS 105.02

Submittal Log

Item No.

Incidental to

Pay Item(s) Description of Submittal

Type of Submittal

Requirement found in Specification No.

/Drawings

Additional Specification References

15 30102 Road Surface Aggregate Material

Certification

FP-14 301

16 630 Control of Water Plan FSSS 630

17 61902 16-foot Gate Material

Certification

FSSS 619

18 61903 25-foot Gate Material

Certification

FSSS 619

Measurement and Payment

153.10 Do not measure Contractor Quality Control for payment. See Subsection 109.05.

155 – Schedules for Construction Contracts

Delete Section 155 in its entirety.

156 – Public Traffic

Delete all subsections in their entirety and replace with the following:

Description

156.01

This work consists of controlling and protecting public traffic adjacent to the project.

Material

156.02

Conform to the MUTCD and the following Sections and Subsections:

Permanent Traffic Control 633 Traffic Signing and Marking Material 718 Concrete Barriers and Precast Guardwalls 618 Temporary Plastic Fence 710.11

Construction Requirements

156.03 Qualifications

Accommodate traffic according to the requirements set forth below, MUTCD, and Section 635.

Perform work in a manner that ensures safety and convenience of the public.

Submit traffic control plan at least 30 days prior to intended use. Perform no work that interferes or conflicts with traffic until a traffic control plan has been approved by the CO.

The Contractor shall erect warning signs on roads in advance of the project area where operations may interfere with public use of the road due to contractor traffic. All road barricades, warning signs, lights, temporary signals, flagmen, and pilot car operators and equipment, and other protective devices, shall conform with Part VI of the Manual on Uniform Traffic Control Devices for Streets and Highways, published by the Federal Highway Administration and applicable safety codes.

156.04 Accommodating Traffic During Work

Install and maintain temporary traffic control devices adjacent to and within the project as required by the approved traffic control plan and the MUTCD. Install and maintain traffic control devices as follows:

(a) Furnish and install traffic control devices before the start of construction operations.

(b) Install only those traffic control devices needed for each stage or phase.

(c) Relocate temporary traffic control devices as necessary.

(d) Remove devices that no longer apply to the existing condition

(e) Immediately replace any device that is lost, stolen, destroyed, or inoperative.

(f) Keep temporary traffic control devices clean.

(g) Remove all temporary traffic control devices upon contract completion or when approved.

(h) When required, use flaggers certified by the American Traffic Safety Services Association, the National Safety Council, the International Municipal Signal Association, a state agency, or other acceptable organization. Perform the work described under MUTCD Part 6. Use type III, VII, VIII, or IX retroreflective sheeting on flagger paddles. Do not use flags. Flaggers must wear high visibility safety apparel as required by MUTCD 6E.02.

156.10 Acceptance

Public traffic work will be evaluated under Subsection 106.02.

Measurement and Payment

156.11

Do not measure Public Traffic for payment. Payment for contract work is provided indirectly. See Subsection 109.05.

157 – Soil Erosion and Sediment Control

Materials

157.02 Materials

Add the following:

Provide bales, wattles, logs and rolls from a certified noxious weed free source.

Construction Requirements

157.04 General

Delete the first two paragraphs and replace with the following:

Submit an Erosion Control Plan detailing permanent and temporary control measures to minimize erosion and sedimentation during and after construction in accordance with the plans and storm water permits. Do not modify the type, size, or location of any control or practice without approval by the CO. Submit the Erosion Control Plan proposal at least 14 days before operations begin to the CO for approval.

Reflect in the Erosion Control Plan special concerns and measures necessary to protect resources and government improvements. Include:

a) The construction activities and sequence of implementation relating to specific erosion control measures.

b) The location and type of permanent controls to be implemented during construction.

c) The location and type of temporary controls to be implemented during construction.

d) Description of the monitoring plan and construction activities and sequence of implementation relating to specific erosion control measures.

Add the following to the third paragraph:

Upon completion of construction at the site, remove all temporary erosion control devices, dewatering materials and equipment from Government property.

157.11 Waterway and Slope Protection and Stabilization

Add the following:

Stockpiled materials are to be fully covered with tarps or approved equal if they are left exposed for extended periods of time, particularly during spring or wet weather, per Forest Service requirements and the CO. Soil stockpiles shall be located away from waterways and shall have erosion control measures implemented. Short-term (1 day or less) stockpiling near waterways is allowable with erosion control measures in place.

Measurement

157.17

Do not measure soil erosion and sediment control for payment. This item is incidental to other items in the contract.

201 – Clearing and Grubbing

201.01 Description

Delete Subsection 201.01 and replace with the following.

This work consists of light to moderate clearing and grubbing required to perform the work shown on the Drawings. This includes removing timber, brush, stumps and roots within the construction disturbance limits.

This work also includes salvage of soil, sod, and plant materials for reclamation (to the extent practical) and construction, as well as disposal of existing unusable woody debris and brush piles as required to complete the work shown on the Drawings. Additional clearing and grubbing to expand staging areas outside of disturbance limits and borrow area may be performed as approved by the CO but are not a part of this work item and are incidental to the bid items.

201.06 Disposal

Delete subsection 201.06 and replace with the following.

Merchantable timber belongs to the Government and shall be stored at an off-site decking location as approved by the CO. Provide temporary stockpiles of woody debris, brush, and stumps within the construction disturbance limits and adjacent to the disturbed areas. Dispose of debris not used for construction and reclamation by evenly spreading along disturbed slopes and as directed by the CO. Exact areas for debris disposal to be approved by the CO prior to placement of debris.

204 – Excavation and Embankment

204.01

Add the following:

(a) Dam excavation, engineering embankment construction, and saddle dike construction. This work consists of excavation of the existing dam embankment as shown in plans and using select material salvaged from the excavations as embankment fill. If material generated from the excavations is not sufficient either in quantity or quality for the embankment fill, a borrow source as shown on the Drawings may be used for embankment fill. This work also includes miscellaneous grading, earthwork, and compaction required for the construction of engineered embankments. Engineered embankments associated with the dam construction are to be constructed and compacted to the highest level as outlined in 204.11. Fresh borrow fill will also need to be mixed onsite with existing salvaged dam embankment material to make a homogeneous mix for use in dam construction.

This work also consists of removal of miscellaneous debris and unsuitable material encountered during excavation of the existing embankment. Excess material (if any) can be hauled and lightly compacted at the secondary borrow/disposal site shown on the drawings. Excess material berms can be lightly compacted using earth moving equipment with 1 to 3 passes using lifts of up to 12 inches.

Material

204.03

Add the following:

Engineered embankment fill shall consist of Select Borrow per Section 704.07.

Construction Requirements

204.07 Subexcavation

Add the following:

The existing embankment material shall be excavated as shown on the Drawings. The existing embankment material shall be stockpiled on-site and select material shall be re-used as embankment engineered fill per Section 704.

204.11 (c) Compaction

Add the following:

Equipment and operation. Compaction equipment shall be sheep’s foot type and of a size adequate to obtain compaction at 95% of the maximum dry density according to ASTM D698 Standard Proctor Compaction (See geotechnical testing information included in these specifications). The engineered embankment material is a lean to fat clay with more than 50% of the material finer than the #4 standard sieve. The material has an optimum moisture content of about 17%. Ensure that in-place moisture content of compacted embankment soils is ideally between 16 and 19% to achieve a ductile and lower permeability material. Maximum lift thickness is limited to 9 inches with material compacted down to 6 to 7 inches nominal thickness. Contractor can optimize the required number of compaction equipment passes to achieve satisfactory compaction through trials and confirmatory compaction testing.

Contractor shall demonstrate their combination of equipment, lift thickness, material types, and number of passes early in the compaction process for approval by the CO. Contractor is welcomed to submit alternate equipment and compaction processes for review and approval by the CO. The loose lift thickness of the material placed should be appropriate for the compaction equipment being utilized, and the maximum loose lift thickness shall be 9 inches. Large rocks and cobbles larger than 6 inches should be manually removed prior to compaction efforts.

The Contractor shall protect the embankment fill lifts from drying, freezing, or over-wetting during construction. Any areas that form shrinkage cracks or a hard crust should be scarified, watered, and recompacted before placing the next lift to ensure adequate bonding to subsequent lifts. If standing water or ponding occurs, the Contractor shall adequately dry the material before placing the next lift. Frozen materials or snow-contaminated materials shall not be used within the embankment, and areas to be filled should be protected from freezing. At the start of each new work day, the Contractor should scarify the working level to prepare for additional lifts.

204.14 Disposal of Unsuitable or Excess Material.

Modify the 1st paragraph to read:

Dispose of unsuitable or excess material in the designated disposal area as shown on the Drawings. Place unsuitable or excess material in a berm and compact with a few (1-3) passes of equipment.

Measurement

204.16

Measure the Section 204 items as listed in the bid schedule and in accordance with Subsection 109.02.

211 – Roadway Obliteration

211.01

Modify the first paragraph to read:

This work consists of obliterating or closing temporary haul roads and other areas outside the roadway prism.

See Obliteration Details included as Appendix B.

211.01 (b) Method 2

Modify the paragraph to read:

For the entire width of the existing road, scarify the road surface to a depth of 6- to 12-inches.

251 – Riprap

251.01

Add the following:

This work consists of importing, gathering, reclaiming and placing cobbles/boulders and furnishing and placing riprap at the locations as shown on the Drawings:

This work also includes the Stone/Rock Salvage Plan (no more than 1 page). The Stone/Rock Salvage Plan shall detail proposed collection areas, methods, access points, and estimated salvaged material quantities. The Stone/Rock Salvage Plan shall be submitted to the CO for approval at least 14 days prior to the beginning of salvaging stone/rock materials. It is estimated that salvaged stone and rock will not be sufficient in quantity, and some stone and rock will need to be imported to the site. If the Contractor determines that there is sufficient stone and rock available for salvage, the Contractor should inform the CO of such.

Material

251.02

Add the following:

Class 2 riprap shall meet the requirements of Section 705. Other gradations may be acceptable, as approved by the CO. Limited available Class 2 riprap shall be salvaged from Borrow Area C as approved by the CO, and any deficient quantity shall be imported. It is expected that the total salvageable onsite riprap will be 80% of the needed quantity.

Filter/bedding gravel shall meet the requirements of Section 704.09. Filter/bedding gravel shall be imported material unless salvageable material is on site and approved by the CO.

Construction Requirements

251.03

Add the following:

Class 2 riprap shall be bedded in 12 inches minimum of M2 (downstream) or M3 (upstream) filter/bedding gravel on the saddle dike and 9 inches minimum of M3 filter/bedding gravel (FSSS 704.09) as shown on the Drawings.

262 – Compaction Grouting

Add the following new Section 262 – Compaction Grouting.

Description

262.01 General

This work shall consist of injecting low mobility grout (compaction grouting) within the improvement zone in accordance with the project plans. There will be two different types of compaction grouting each with its own type of grout hole – Seismic Mitigation and Hydraulic Barrier.

Material

262.02 Seismic Mitigation Compaction Grouting

Contractor must develop a Compaction Grouting Plan for approval by the Contracting Officer. The plan must include the following items at a minimum:

(a) Proposed construction equipment list to be used for the project including grout mixer, pump plant, pressure gauges, and drilling equipment or other.

(b) Proposed method to monitor grouting pressures and ground surface heave.

(c) Proposed grout mix design.

(d) Proposed compaction grouting layout.

(e) Proposed initial grout pressures and grout take to be employed.

The Contractor will develop the final grouting plan and mix design in accordance with the following design criteria:

(a) The grout mix should have a coarse fraction with a maximum particle size of 3/8 inch.

(b) Maximum grout slump should be 1.5 inches.

(c) Compaction grouting should be focused from elevation 6,325 feet to 6,340 feet NAVD 1988 which is the target area of loose soils.

(d) Standard cement grouting can occur from elevation 6,340 feet to top of work bench elevation of 6,350 feet.

(e) Grouting should be performed from the bottom up starting at elevation 6,325 feet NAVD 1988.

(f) Grouting should occur in 1 foot intervals starting at the bottom elevation of 6,325 feet and working up to elevation 6,340 feet.

(g) Maximum grout take should be limited to 10 cubic feet per foot but is expected to be less than 5 cubic feet per foot at most hole locations.

(h) Maximum grouting pressure should be limited to 800 psi from elevation 6,325 to 6,330 feet.

(i) Maximum grouting pressure should be limited to 600 psi from elevation 6,330 to 6,340 feet.

(j) Maximum portion of cement in the grout mix should be limited to 15% by volume for each grout hole.

(k) The required acceptance criteria will be a raw Standard Penetration Test (SPT) blow count of 18 after compaction grouting.

(l) Eight SPT core boreholes shall be installed in the designated treatment area to elevation 6,320 feet NAVD 1988 as part of the pre-grouting program to identify average pre-construction soil relative density and SPT blow count.

(m) Up to eight SPT core boreholes shall be installed in the treatment area to elevation 6,320 feet NAVD 1988 as part of the post-grouting program to identify post-construction soil relative density and SPT blow count.

(n) Additional secondary compaction grout holes shall be installed in areas where the SPT blow count of 18 (acceptance criteria) is not met. Secondary compaction grout holes shall be installed at four to six feet spacing as needed by the Contractor to meet acceptance criteria.

262.03 Hydraulic Barrier Compaction Grouting

Contractor must develop a Hydraulic Barrier Grouting Plan for approval by the Contracting Officer. The plan must include the following items at a minimum:

(a) Proposed construction equipment list to be used for the project including grout mixer, pump plant, pressure gauges, and drilling equipment or other.

(b) Proposed method to monitor grouting pressures and ground surface heave.

(c) Proposed grout mix design to develop a soil-grout column with a hydraulic conductivity goal of less than 1 X 10-6 cm/sec.

(d) Proposed grouting layout.

(e) Proposed initial grout pressures and grout take to be employed.

The Contractor will develop the final grouting plan and mix design in accordance with the following design criteria:

(a) The grout mix should have a coarse fraction with a maximum particle size of 3/8 inch.

(b) Maximum grout slump should be 1.5 inches.

(c) Grouting should be focused from elevation 6,325 feet to 6,340 feet NAVD 1988 which is the target area for the foundation cutoff barrier.

(d) Standard cement grouting can occur from elevation 6,340 feet to top of work bench elevation of 6,350 feet or higher towards the dam abutments.

(e) Grouting should be performed from the bottom up starting at elevation 6,325 feet NAVD 1988.

(f) Grouting should occur in 1 foot intervals starting at the bottom elevation of 6,325 and working up to elevation 6,340 feet.

(g) Maximum grout take should be limited to 5 cubic feet per foot but is expected to be less than 2 cubic feet per foot at most hole locations.

(h) Maximum grouting pressure should be limited to 400 psi from elevation 6,325 to 6,330 feet.

(i) Maximum grouting pressure should be limited to 200 psi from elevation 6,330 to 6,340 feet.

(j) Maximum grouting pressure should be limited to 150 psi from elevation 6,340 to 6,350 feet or within 10 feet of work platform surface top.

(k) The required acceptance criteria will be based upon collection of undisturbed soil samples in 5 core boreholes to be located at the center of 5 grouted holes along the barrier centerline in five test sections. Undisturbed Shelby tube samples shall be collected from elevation 6,326 to 6,329 feet NAVD 88 or as close vertically to that elevation zone as practical. Undisturbed soil samples will be tested using a falling head hydraulic conductivity test using a flexible-walled permeameter per ASTM D5084. The acceptance criteria for the maximum hydraulic conductivity is a value less than 1 X 10-6 cm/sec. After acceptance drilling, boring shall be grouted closed using neat cement grout.

(l) In acceptance boreholes where the hydraulic conductivity is greater than the acceptance value, secondary borings will be installed on a line north of the line being tested. Three overlapping holes shall be installed to the north of each failing test location.

Measurement

262.04

Measure the Section 262 pay items listed in the bid schedule according to Subsection 109.02 and the following as applicable:

(a) The compaction grouting for Seismic Mitigation will consist of Primary Borings (25 feet total boring depth with 10 feet overburden) and Secondary Borings (25 feet total boring depth with 10 feet overburden).

(b) The compaction grouting for Hydraulic Barrier will consist of Shallow Borings (25 feet total boring depth with 10 feet overburden), Mid-Level Borings (30 feet total boring depth with 10 feet overburden), and Deep Borings (35 feet total boring depth with 10 feet overburden).

Payment

262.05

The accepted quantities will be paid at the contract price per unit of measurement for the Section 262 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.02.

604 – Manholes, Inlets, and Catch Basins

604.01

Modify to read:

This work consists of installing a Montana Public Works 24-inch standard riser inlet with a 6-inch v-notch weir on 12-inch outlet hole.

Material

604.02

Modify to read:

The manhole shall conform to Montana Public Works standards. The outlet and v-notch weir shall meet the requirements shown on the Drawings.

Construction Requirements

604.03 General

Delete subsection and replace with the following:

Excavate and backfill in accordance with the Drawings.

604.05, 604.06, 604.07, and 604.08

Delete subsections.

604.09 Acceptance

Delete subsection and replace with the following:

Material for precast concrete units will be evaluated under Subsections 106.02 and 106.03. Installation of precast concrete units will be evaluated under Subsections 106.02 and 106.03.

Measurement

604.10

Modify to read:

Measure the Section 619 items as listed in the bid schedule and in accordance with Subsection 109.02.

619 – Fences, Gates and Cattle Guards

Construction Requirements

619.03 Fences and Gates

Add the following.

Minimize disturbances to existing fences and gates as required to complete the work. Repair or replace any damaged fences or gates to the satisfaction of the CO.

Install three new gates – one 16-foot gate and two 25-foot gates. The locations and details for the gates are shown in the plan drawings.

Measurement

619.10

Measure the Section 619 items as listed in the bid schedule and in accordance with Subsection 109.02.

624 – Topsoil

624.01

Add the following:

This work includes stripping 6 inches of topsoil within disturbance areas (except where soils are saturated) and placement of salvaged topsoil on finished slopes to the lines, grades, and thicknesses shown on the Drawings.

Stripped topsoil shall be stockpiled in locations within the disturbance boundaries or in areas approved by the CO. Topsoil shall be placed to a minimum depth of 3 inches. Any excess topsoil shall be placed on top of one of the fill areas as designated by the CO.

625 – Turf Establishment

Delete all subsections in their entirety and replace with the following:

Description

625.01

Seed mix and its application will be government furnished.

626 – Plants. Trees, Shrubs, Vines, and Groundcovers

626.01

Delete this sentence and add the following:

This work is clump-planted vegetation which consists of excavating, transporting and re-planting trees, shrubs, vines, groundcovers, and other plants with machinery.

Material

626.02

Add the following:

Existing plant material will be made available within 500 feet of the project site for re-planting on the new embankment slopes, and channel bank. Do not excavate plant material unless the Contractor’s operations will permit re-planting within 2 hours.

Construction Requirements

626.03

Add the following:

The excavated plant shall have a sufficient root system and dirt clump to establish a healthy growing condition.

Payment

626.16

The accepted quantities will be paid at the contract price per unit of measurement for the Section 626 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.02.

630 – Control of Water

Add the following new Section 630 – Control of Water.

Description

630.01

Conform to the following:

The work covered by this section includes provisions to design, control, handle, and dispose of surface water and groundwater, and all other water that may be encountered, as required for performance of the work. This work also includes the Control of Water Plan. A Control of Water Plan shall be submitted to the CO at least 30 days prior to the beginning of construction. The Control of Water Plan shall describe all the aspects described in this specification and required by the CO.

The Contractor will always be responsible for the continuous control of water during the project and will provide adequate backup systems to accomplish control of water. Control of water includes the following aspects to facilitate embankment and outlet works construction:

(a) Diverting and/or temporarily impounding stream inflow away from work areas. Stream flow varies based on snowmelt and rainfall conditions;

(b) Dewatering excavated areas to allow placement of embankment fill in dry conditions; and

(c) Controlling all groundwater, surface water and storm water.

The USFS’ fish salvage shall be done through the dewatering in phases. The 30-day window prior to the start of dewatering will allow the USFS to salvage the majority of the fish, but 3-4 days while the reservoir is dewatered will be necessary to salvage the remaining fish. To accomplish this, the dewatering shall be done slowly over a few days.

Material

630.02

The Contractor will determine the materials required to meet these specifications.

Construction Requirements

630.03

Dewatering shall not adversely affect any downstream structures or property owners. Downstream property owners shall be notified by the Contractor prior to dewatering and as outlined in the Water Control Plan.

630.04

The Contractor will take measures to minimize sediment transport during stream diversion. The Contractor shall describe the proposed measures in the Control of Water Plan.

630.05

All materials used to divert stream flow will be removed from the project area and disposed of offsite upon completion of construction.

630.06

Contractor will provide a Control of Water Plan submittal associated with Work covered by this Specification, to include:

(a) Anticipated schedule of diversion and dewatering activities.

(b) Method for diverting and/or temporarily impounding stream inflow away from work areas. This includes controlling all groundwater, surface water, and storm water.

Measurement and Payment

630.07 Measurement

Measure Control of Water according to Subsection 109.02.

630.08 Payment

The accepted quantity, measured as provided in Subsection 109.02, will be paid at the contract price per unit of measurement for the Section 630 pay item shown in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05.

640 – Outlet Works

Add the following new Section 640 – Outlet Works.

Description

640.01 This work consists of furnishing and installing the 6-inch perforated and solid toe drain pipes and 24-inch standard riser inlet as shown in…