Lion Lake Dam and PlaformFSSS.pdf

Lion Lake Dam Rehabilitation Project Flathead National Forest

FOREST SERVICE

SUPPLEMENTAL SPECIFICATIONS

LION LAKE DAM

REHABILITATION PROJECT

SECTION 16, TOWNSHIP 30 NORTH, RANGE 19 WEST

48.368970 N, 114.032164 W

JANUARY 13, 2021

HUNGRY HORSE RANGER DISTRICT

FLATHEAD NATIONAL FOREST

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 203 Removal of Structures and Obstructions FSSS 204 Excavation and Embankment FSSS 251 Riprap FSSS 619 Fences, Gates, Cattle Guards and Bollard Posts FSSS 624 Topsoil FSSS 625 Turf Establishment FSSS 630 Control of Water FSSS 640 Outlet Works

FSSS 641

FSSS 645

Sliplining of Upstream Outlet Pipe Slide Gates & Appurtenances

FSSS 650

FSSS 655

FSSS 704

Handling and Removal of Potentially Hydrocarbon-Impacted Soils Concrete Tower Exterior Treatment Soil

FSSS 705 Rock

SUPPLEMENTAL SPECIFICATION LIST OF APPENDICES

APPENDIX A – Location Map for Boreholes on South Dam Embankment

APPENDIX B – Borehole Logs

APPENDIX C – Laboratory Testing Data from Boreholes

APPENDIX D – 1947 Design Plans for Lion Lake Dam

APPENDIX E – Analytical Requirements for Hydrocarbon-Impacted Soil Testing

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 National Forest System Roads for 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 the Lion Lake south dam and raising the embankment on the north dam.

The south dam rehabilitation includes the following elements:

• Upstream Embankment Slope o Re-contour and smooth o Add riprap for wave action erosion protection

• Outlet Shaft/Spillway Structure o Core a weir into the wall o Replace vertical slide gate o Add new upstream vertical slide gate o Rehabilitate exposed concrete surfaces o Rehabilitate existing handrail

• Outlet Pipe o Replace downstream outlet pipe o Remove and dispose of concrete retaining structure at the downstream end of the outlet pipe o Add rock riprap erosion control downstream of the outlet pipe o Slipline upstream outlet pipe

• Embankment Crest o Raise the embankment crest o Shift the centerline of the embankment crest downstream

• Downstream Embankment o Rebuild embankment fill o Add toe drain and chimney drain o Flatten downstream embankment slope

• Parking Lot o Patch and repair existing damaged areas o Add slurry seal coat

The north dam rehabilitation includes the following elements:

• Embankment Crest o Raise the embankment crest to same elevation as south dam

104 - Control of Work

Delete Subsections 104.01, 104.02, and 104.04.

Add the following subsection:

104.06 Boundaries of the Construction Areas

The Contractor shall mark the boundaries of the construction areas. The Contractor shall develop and make any detailed surveys needed for construction of the work involved. The Contractor shall be held responsible for the preservation of all primary and other control markings established in accordance with Section 152. If control markings are destroyed or disturbed by the Contractor, the Contractor shall replace them at no cost to the Government.

The Contractor shall stake all disturbance limits, and all other features of the work and receive approval from the CO before proceeding with the work on these items. Staking and surveying by the Contractor will be as specified in Section 152.

The Contractor is allowed to close the south dam recreation area while the area is under construction. The Contractor is also allowed to close the immediate vicinity of the north dam embankment during construction, but the north dam recreation area and loop road are to remain open to the public. The contractor is required to submit a traffic control plan for managing traffic around the borrow area, construction sites, and the main highway (Flathead County Route 516) linking the borrow area and construction sites as detailed in Section 156.

Add the following subsection:

104.07 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 as required within.

Add the following subsection:

104.08 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 (i.e. standard proctor tests, gradation tests) in a timely manner, bring the material on-site, so as not to hold up the work.

105.02 Material Sources

105.02(a) Government-provided sources

Add the following:

Select Borrow Select borrow required for the project shall be mined from the designated borrow area at coordinates (in decimal degrees) 48.372194, -114.035733. The designated borrow area is show on the Drawings Sheet 4 and is located on the cut slope side of North Lion Lake Road (NFSR #5311), near the junction of the loop road to the North Lion Lake Recreation Area and NFSR #5311. Alternate or additional borrow areas north of NF-5311 may be developed with approval of the CO. Prior to mining the material, topsoil shall be stripped from the designated borrow area and temporarily stockpiled adjacent to the borrow area. After all mineral material mining and hauling is completed, the desginated borrow area shall be reclaimed by spreading the conserved topsoil back over the newly created slopes of the borrow area. The floor of the borrow area shall be gently sloped to allow run-off to drain to the existing roadside ditch. This work requires vegetation be re-established on the cut slopes of the designated borrow area, according to Section 625.

105.02(b) 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.

108 - Prosecution and Progress

Delete Section 108 in its entirety.

109 - Measurement and Payment

109.02 Measurement Terms and Definitions

(b) Contract quantity.

Add the following:

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:

(q) 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.

(r) 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. 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. 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 onto 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.

The staging areas will be the parking areas to the northwest and southeast of the south dam embankment, as identified on the Drawings Sheet 4. The coordinates (in decimal degrees) of the northwest staging area are 48.369017, -114.033013. The coordinates (in decimal degrees) of the southeast staging area are 48.368825, -

114.031894. Coordinate with the CO prior to staging equipment and materials. Temporary traffic control and signage are also incidental to this item.

The project schedule and period of performance shall be per the Contract Documents.

New infestations of noxious weeds of concern to Forest Service and identified by either Contractor or Forest Service, on the Project Area or on the haul route, will be promptly reported to the other party. Contractor and Forest Service will agree on treatment methods to reduce or stop the spread of noxious weeds when new infestations are found.

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

1 151 Weed Free Material Source Certification

Material Certification FSSS 105 FSSS 151

2 151 Hazardous Spill Plan Plan FSSS 107.10 3 151 Contractor Quality Control Plan Plan FP-14 153.03 FP-14 552.09

4 151 Erosion Control Plan Plan FSSS 157.03

5 204 Filter Sand for Chimney Drain Material Certification FSSS 640

6 251 Filter Gravel under Wave Protection Riprap

Material Certification FSSS 703.03

7 204 Foundation Compaction Testing Test Results FSSS 204.11

8 204 Select Borrow Compaction Testing Test Results FSSS 204.11

9 251 Riprap, Class 1 Material Certification FSSS 251, FSSS 705

10 251 Riprap, Class 2 Material Certification FSSS 251, FSSS 705

11 302 Crushed Base Course Material Certification FP-14 302

12 302 Sub-Base Course Material Certification FP-14 302

13 403 Asphalt Materials Certification FP-14 403

14 410 Asphalt Slurry Seal Coat Materials Certification FP-14 410

15 601 Concrete Cradle Construction Plan FSSS 640

16 605 6 Inch HDPE Pipe Material Certification FSSS 640

Submittal Log

Item No.

Incidental to

Pay Item(s) Description of Submittal

Type of Submittal

Requirement found in Specification No.

/Drawings

Additional Specification References

17 625 Seed Certification Material Certification FSSS 625

18 630 Control of Water Plan FSSS 630

19 640 36 in RCP pressure pipe Material Certification FSSS 640

20 640 32 in HDPE Pipe Material Certification FSSS 641

21 640 Access Lids to Spillway Tower Plan & Design FSSS 640

22 640 Interior Tower Grate Plan & Design FSSS 640

23 640 Handrail Paint Material Certification FSSS 640.03

24 645 36-inch Slide Gate

Material Certification

& Shop Drawings

FSSS 645

25 640 Slipline Plan Plan FSSS 641

26 640 Cellular Grout Material Certification FSSS 641

27 640 Slide Gate Control Handle Design FSSS 640

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 and within 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 General. The Contractor shall submit a traffic control plan for acceptance by the CO before beginning project operations. 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. The contractor will be allowed to close National Forest System roads that access the two Lion Lake Project dams as discussed in Section 104.06.

All other roads used by the contractor shall be kept open to adequately accommodate public traffic during project work. The Contractor shall coordinate with the State for any traffic control required along Flathead County Route 516 (CO15516). Delays may not exceed 30 minutes at any one time followed by an open period of no less than 30 minutes. Accommodate public traffic on roads adjacent to and within the project until the project is accepted according to Subsection 106.07(b).

Submit traffic control plan at least 30 days prior to intended use. Perform no work that interferes or conflicts with traffic or existing access to the project dams 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.

As a minimum, it is anticipated that the following type and number of signs will be required:

156.04 Temporary Traffic Control. 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 conditions.

(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.

156.06 Acceptance. Public traffic work will be evaluated under Subsection 106.02.

Measurement and Payment

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

Location Designation Quantity

During haul of Select Borrow & Dam Embankment Waste

• On NFSR #5311, east of intersection w/ MT State RTE 15516 (paved road to

Hungry Horse Dam).

• On MT State RTE 15516, south of intersection w/ NFSR #5311 “North Lion Lake” recreation area.

• On MT State RTE 15516, north of intersection w/ NFSR #5311 “North Lion Lake” recreation area.

• On MT State RTE 15516, south of intersection w/ “Lion Lake South Dam”.

• On MT State RTE 15516, north of intersection w/ “Lion Lake South Dam”.

“Haul Trucks Entering” (36” x 36”) Similar to

W21-3

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 7 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.

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 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 disposal of existing 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 all debris by evenly spreading along existing fill slopes northwest of the north dam between North Lion Lake Road and Flathead County Route 516, and as directed by the CO. Exact areas for debris disposal to be approved by the CO prior to placement of debris. Do not place woody debris on the north dam embankment or on its abutments. Do not place woody debris in channels or upstream of the dam.

203 – Removal of Structures and Obstructions

203.01 Description

Add the following:

This work consists of removing and disposing of the existing 36-inch RCP outlet pipe from its connection point at the existing outlet tower, down to where it connects with the concrete wingwall structure. This work also consists of removing the existing wingwall structure at the existing pipe outlet, as identified on the Drawings and the existing slide gate infrastructure as shown on the Drawings.

203.05 Disposing of Material

Modify this subsection as follows:

(a) Remove from project. Add the following:

All materials designated for removal become the property of the Contractor and are to be disposed of by removing from Forest Service Lands in accordance with all local, state and federal requirements.

(b) Burn. Delete this section.

(c) Bury. Delete this section.

204 – Excavation and Embankment

204.01 Add the following:

(a) Dam Excavation and Embankment. This work consists of excavation of portions of the existing south dam embankment approximately as shown in plans, replacing select borrow material salvaged from the excavation, and mining and importing select borrow from the designated borrow area as required to get the embankment dam up to design grade. Dam embankment excavation at the South embankment shall be conducted so that material is removed as a mass excavation – approximate extents of the excavation are shown on the grading plan. The contractor shall excavate down to competent bedrock as directed by the CO and remove any deleterious or overly wet materials within the excavation limits. Estimated construction surfaces are shown on the cross sections within the design plans. The work also includes importing select borrow material and raising the north embankment as outlined in the plans. This work also includes foundation earthwork and preparation, filter sand placement, pipe placement, and miscellaneous grading, earthwork, and compaction required for the embankment construction.

This work also consists of removal of miscellaneous debris and unsuitable material encountered during excavation of the existing south embankment. It is anticipated the contractor will have to remove most material in the regions where excessive seepage has been noted on the Drawings. The extents of material to be removed will be reviewed and approved by the CO as the work progresses. This work also consists of the salvaging and placement of native streambed gravel to fill the voids of the rock riprap pad at the downstream end of the outlet pipe.

This work also includes reclamation of the designated borrow area.

Material

204.03 Add the following:

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

Filter sand shall meet the requirements of Section 703.01.

Rock infill and riprap filter gravel shall meet the requirements of Section 703.03

Construction Requirements

204.07 Subexcavation

Add the following:

Portions of 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 fill per Section 704. Potentially hydrocarbon-impacted soils may be encountered during excavation of the south dam.

Refer to FSSS 650 for the action to be taken if hydrocarbon-impacted soils are encountered. The CO shall be allowed to witness the foundation conditions to ensure that the designated portions of the existing embankment fill have been removed down to native, competent bedrock, and that the existing foundation is a stable, dense material compacted per Subsection 204.11. If overly moist, soft, or otherwise unsuitable foundation material is encountered, that material should be over-excavated down to adequate foundation soils and the over-excavated material placed within the designated borrow area.

204.08 Borrow Excavation

Add the following:

Government-furnished select borrow will be required to supplement the excavated embankment soils as specified in Section 704. The designated borrow area is specified in Section 105.02. Prior to mining the material, topsoil shall be stripped from the designated borrow area and temporarily stockpiled adjacent to the borrow area. Blend finished side slopes of the borrow area at 3H:1V or flatter slopes. The floor of the borrow area shall be gently sloped to allow run-off to drain to the existing roadside ditch and proofrolled to ensure a dense, unyielding condition. Conserved topsoil as specified in Section 105.02 shall be replaced evenly on side slopes of the borrow area and slopes shall be hydroseeded as specified in Section 625. Do not stockpile woody debris or cleared and grubbed material within the borrow area.

204.10 Embankment Construction

Add the following:

The construction of each lift shall be in a continuous, approximately horizontal layer for the full length and width of the dam embankment. Embankment material shall be mixed and blended to provide a homogeneous section. Provide primary water conditioning, mixing, and blending in stockpiles if necessary. Distribute the fill in any given zone and lift such that it is free from lenses, pockets, streaks, or layers differing in material type or texture or gradation from the surrounding fill.

204.11 Compaction

Add the following:

Equipment and Operation. Compaction equipment will be of suitable type and size adequate to obtain the material in-place densities specified in an efficient process in the judgment of the CO. The combination of compaction equipment weight and energy shall achieve a dense unyielding soil condition with 4 to 6 passes over compatible lift thicknesses of between 4 and 9 inches and with moisture content within 3% of optimum. A ride-on vibratory roller with either smooth or padded drum is suggested, and it is also suggested that the contractor demonstrate that their combination of equipment, lift thickness, material types, and number of passes achieves the specified dry density early in the compaction process to expedite production and confidence in the results. Contractor is welcomed to submit alternate equipment for review and approval by the CO. Compaction equipment shall be operated in strict accordance with the manufacturer's instructions and recommendations.

Equipment shall be maintained in such condition that it will deliver the manufacturer's rated compactive effort.

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.

Provide hand-operated tampers equal to a Wacker model GVR100Y and lift thickness of no more than 5 inches for compacting against concrete surfaces and at locations where large compacting equipment cannot operate effectively. Compaction shall be performed in a way that ensures adjacent structures are not damaged during compaction. All materials shall be compacted to standards including in areas unsuitable for large equipment access. Additional compactive effort is anticipated in these areas.

Flathead National Forest

Dam Foundation Subgrade and Embankment Fill Requirements. The embankment foundation (native shale subgrade) shall be proof-rolled or compacted to a dense, unyielding condition to the satisfaction of the CO.

Compact all select borrow used as embankment fill in 9-inch thick (maximum) loose horizontal lifts to a minimum of 95% of the maximum dry density per AASHTO T-180 (modified Proctor). It may be necessary to adjust the moisture of the material to achieve the specified optimum moisture and compaction standard.

Additionally, each lift of select borrow used for the dam embankment shall be rolled for a minimum of 4 passes with a suitable compactor and lift thickness to achieve a dense unyielding condition and shall be tested for in-place density before placement of the next lift.

Seepage areas below toe and chimney drains shall be backfilled with filter sand and lightly compacted up to said drains to provide an outlet for the seepage.

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.

Density Testing and Inspection. The Contractor shall engage a qualified independent geotechnical engineering testing agency to perform field quality-control density tests. The CO will require the Contractor to measure the degree of compaction (field density) during embankment construction at the rate specified in the table below. Measurements will be based on optimum moisture contents and maximum density curves submitted prior to construction. Field or in-place density refers to the dry density expressed in pounds per cubic foot of a layer of compacted material in place at the site as determined by a sample representative of the compacted layer. Frequency of testing beyond the requirements outlined here is at the discretion of the CO. All compaction testing results shall be furnished to the CO within 48 hours.

Compacted materials shall also meet the performance specifications discussed previously and summarized in the table below.

Work Area Material & Density Required Required Testing Frequency Dam Foundation Native Shale Bedrock – proof rolled and compacted to a dense unyielding condition.

N/A; CO’s approval

Dam Embankment

Select Borrow – compacted with 6 passes/lift to a dense unyielding condition (95% max dry density at +/-3 % optimum moisture).

3 tests each lift

Structure Backfill Select Borrow – compacted to a dense unyielding condition (95% max dry density at +/-3 % optimum moisture)

3 tests each lift

Subdrains & Chimney Drains

Washed sand placed in 2’ lifts and lightly compacted with tracks or equipment bucket. Scarify between lifts.

N/A

Measurement

Add the following:

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

251 - Riprap

251.01 Add the following:

This work consists of gathering, reclaiming and placing large boulders and furnishing and placing riprap at the following locations as shown on the Drawings Sheets 5, 7, 8, 9, 14, and 15:

(1) Boulders shall be placed on the upstream face of the finished embankment for wave protection. If there are not enough boulders to protect the entire upstream face, boulders shall be prioritized for beach and water access areas, and Class 1 riprap shall be used as needed for remaining areas as approved by the CO.

(2) Class 2 riprap shall be placed at the erosion control pad at the discharge of the outlet pipe.

Riprap filter/bedding gravel is incidental to this pay item.

Material

251.02 Add the following:

Boulders shall be reclaimed from the existing shoreline and site area. Boulders shall have a minimum diameter of 2.5 feet. An estimated 200 linear feet of qualified boulders are available for reuse based on aerial drone imagery. Contractor shall verify amount of qualified boulders before procuring Class 1 riprap.

Class 1 and Class 2 riprap shall meet the requirements of Section 705. Other gradations may be acceptable, as approved by the CO.

Filter/bedding gravel shall meet the requirements of Section 704.10. Required filter/bedding gravel quantity is estimated at 350 CY based on the following:

• 40% coverage of upstream dam face riprap area (Drawings Sheet 5) using boulder detail on Drawings Sheet 7, where the estimated cross-sectional area of gravel is taken as the average of the actual area shown on Sheet 7 and a conservative “boxed” area of the boulder section (Sheet 7), subtracting the boulders (estimated 3-ft average diameter).

• 60% coverage of upstream dam face riprap area (Drawings Sheet 5) using Class 1 riprap, with a depth of 1 foot of bedding gravel and an additional 1 foot of gravel on top of placed riprap per FSSS 215.03.

• Class 2 riprap area (Drawings Sheet 15) with a depth of 1 foot of bedding gravel and an additional 1 foot of gravel on top of placed riprap per FSSS 215.03.

Construction Requirements

251.03 Add the following:

Riprap and boulders shall be carefully placed to ensure adjacent structures are not damaged during construction.

Riprap and boulders shall be bedded in one foot minimum of riprap filter/bedding gravel (FSSS 704.10). Add 12 inches of filter/bedding gravel on top of finished Class 1 and Class 2 riprap to infill void spaces in placed riprap.

Boulders shall be placed in two or three rows parallel to the shore. Boulders within each row shall be tightly spaced. The horizontal distance between rows of boulders can be variable and field-fitted to the site to maintain an approximate 3H:1V overall. Additional filter/bedding gravel shall be placed roughly level between boulder rows at an elevation no lower than the top elevation of the lower row of boulders.

Elevations of boulders shall be as follows:

a) The top row of boulders should have a top elevation at least 3 feet above normal pool elevation, which means the top elevation of the top row of boulders must be at least 3469 feet. The top row of boulders shall be excavated into the embankment so that the top elevation protrudes at least slightly above the finished embankment slope.

b) For two adjacent rows of boulders, the bottom elevation of the upper row of boulders shall be a minimum of 12 inches below the top elevation of the lower row of boulders. In other words, the lower row of boulders must have a top elevation at least 12 inches higher than the upper row’s base elevation.

c) The lowest row of boulders should have a base elevation at least 2 feet below normal pool elevation, which means base elevation of the lower row of boulders must be 3464 feet or lower.

If only two rows of boulders are used, the boulders in the upper row must have a minimum diameter of 3 feet to meet the above criteria.

619 – Fences, Gates and Cattle Guards

Construction Requirements

619.03 Fences and Gates

Add the following.

Minimize disturbances to fences and gates as required to complete the work. Repair or replace any damaged fences or gates to the satisfaction of the CO. Disassemble the road traffic control gate located at the existing dam entrance prior to beginning earthwork operations. Stockpile the gate at the project site in a location approved by the CO. The gate shall be then placed at its original location at the end of construction at the discretion of the CO.

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 topsoil within disturbance areas 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 6 inches. Excess topsoil shall be placed within the designed borrow area.

625 – Turf Establishment

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

Description

625.01 This work consists of soil preparation, watering, fertilizing, seeding, and mulching. Fertilizing, seeding, and mulching are to be accomplished simultaneously using the hydraulic method.

Material

625.02 Conform to the following Subsections:

Agricultural limestone 713.02 Fertilizer 713.03 Mulch 713.05 Seed 713.04 Tackifiers 713.11 Water 725.01(b)

Construction Requirements

625.03 General. Apply turf establishment to prepared ground or any disturbed area between May 1 – June 15 and September 1 – October 15. Apply turf establishment to the areas shown on the plans or worklists within 10 days after completion of ground disturbing activities.

Seeded areas damaged by construction activities shall be reseeded within 10 days of the damage. Do not seed during windy weather or when the ground is excessively wet, frozen, or snow covered.

Assure that all seed and mulch used in the work conforms to the weed free requirements of Section 713.

625.04 Preparing Seedbed. Ensure that the surface soil is in a roughened condition favorable for germination and growth.

625.05 Fertilizing. Apply fertilizer in conjunction with seeding as specified in Section 625.06 by the use of hydraulic-type equipment capable of providing a uniform application using water as the carrying agent.

Apply fertilizer at the rate of 4.5 lbs…