6-FP-14_Challis_Bridge_Site_Maintenance.pdf

Special Contract Requirements Idaho Falls District, ID

CHALLIS BRIDGE SITE MAINTENANCE Bureau of Land Management

7/31/2024 1

SPECIAL CONTRACT REQUIREMENTS

FOR THE CONSTRUCTION OF THE

CHALLIS BRIDGE SITE MAINTENANCE

PROJECT

Description of Work

The work to be done under this contract includes all labor, supervision, transportation, equipment, tools, supplies, materials and incidentals necessary to perform maintenance/improvements of Bureau of Land

Management (BLM) Challis Bridge Recreational Site Road and Parking Areas to specified dimensions.

Includes loading, hauling, placing, shaping, watering, and compaction of Contractor furnished aggregate material, the replacement of (1) existing culvert with new Contractor furnished culvert, and installation of cable concrete block mats on a designated section of the road. Mobilization, traffic signing, site preparation, watering, grading, compaction, and finish work are all the responsibility of the contractor.

There has been one mobilization allocated for this project. The Contractor shall be responsible for all costs associated with additional mobilizations. Any damage to project site assets caused by travel back and forth to the project site and on-site work must be repaired at the contractor expense.

Project Location

See attached maps. The project site is located approximately 3.3 miles Southeast of Challis, Idaho.

Leaving Challis, travel South on US-93 S for 3 miles. .55 miles past the US-93/ID-75 intersection turn left into the Challis Bridge Recreational Site. Lat: 44.469426º Long: -114.201263º

Performance Period

All work; Sept 23, 2024, to August 16, 2025. 312 Calendar Days from Notice to Proceed (NTP).

Local conditions (weather conditions, road conditions, etc.) that may affect work are included in the performance period. Contractor shall coordinate work hours with the COR/CO 48 hours in advance of beginning work.

Special Contract Requirements IDAHO FALLS DISTRICT, ID

CURLEW ROAD MAINTENANCE 2020 Bureau of Land Management

Applicable Standard Specifications

The General Requirements (Division 100) and the applicable sections of Divisions 150 through 700 of the Federal Highway Administration’s "Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects, FP-14, U.S. Customary Units" of the U.S. Department of Transportation, Federal Highway Administration apply to this project as modified by these Special Contract

Requirements and Contract Clauses contained in the contract. Unless otherwise noted, all reference headings in these Special Contract Requirements refer to divisions, sections, subsections, articles or paragraphs of the Standard Specifications, FP-14. The Contractor shall keep a copy of FP-14 on site during all construction for this project.

The FP-14 is a separately published book by the Federal Lands Highway. To download FP-14 or to obtain a hard copy, visit:

http://flh.fhwa.dot.gov/resources/pse/specs/fp-14.htm

Specific Project Supplemental Specifications

Preface

Section 101 - Terms, Format, and Definitions

Section 102 – Bid, Award, and Execution of Contract

Section 103 – Scope of Work

Section 104 – Control of Work

Section 105 – Control of Material

Section 106 – Acceptance of Work

Section 107 – Legal Relations and Responsibility to the Public

Section 108 – Prosecution and Progress

Section 109 – Measurement and Payment

Section 156 – Public Traffic

Section 203 – Removal of Structures and Obstructions

Section 204 – Excavation and Embankment

Section 207 – Earthwork Geosynthetics

Section 209 – Structure Excavation and Backfill

Section 301 – Untreated Aggregate Courses

Section 303 – Reconditioning

Section 601 – Minor Concrete Structures

Section 602 – Culverts and Drains

Section 703 – Aggregate

Section 704 – Soil

Section 707 – Metal Pipe

Section 708 – Plastic Pipe

Section 714 – Geosynthetic Material

Section 725 – Miscellaneous Material http://flh.fhwa.dot.gov/resources/pse/specs/fp-14.htm

PREFACE

Delete the Preface and substitute the following:

These Standard Specifications for the Construction of Roads and Bridges on Federal Highway Projects are issued primarily for constructing roads and bridges on Federal Highway projects under the direct administration of the Bureau of Land Management. These specifications are cited as "FP-14" indicating

"Federal Project" Standard Specifications issued in 2014 and contain both United States Customary and

Metric units of measure.

When designated in a contract, the FP-14 becomes part of the contract and binding upon all parties to the contract. Construction contracts of the Bureau of Land Management are also governed by the following regulations:

● Federal Acquisition Regulation (FAR), Title 48, Code of Federal Regulations, Chapter 1

The FAR regulations are not included in the FP-14. A complete copy of the FAR is available from the

Superintendent of Documents, Congressional Sales Office, U.S. Government Printing Office, Washington, DC 20402.

U.S. Customary units of measure are used in the FP-14 as provided in the November 25, 2008 Memorandum from Jeffrey F. Paniati entitled Update on Metric Use Requirements for FHWA Documents. Metric units are noted in parentheses following the U.S. Customary Units. The references to Metric or Metric units apply only when the project or portion of the project expressly calls for Metric units of measure.

DIVISION 100

GENERAL REQUIREMENTS

Section 101. – TERMS, FORMAT AND DEFINITIONS

101.01 Meaning of Terms. Add the following:

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

101.03 Abbreviations. Add the following to (a) Acronyms:

AA

AAN

AAR

ABA

ACPA

ADA

AFPA

AI

AIA

ARA

AREA

ASCE

ASCII

ASLA

BLM

FTMS

GSA

IEEE

MIL

MSHA

NESC

NFPA

PCA

SAE

USFS

USGS

USPS

WCLIB

WWPI

Aluminum Association

American Association of Nurserymen

Association of American Railroad

Architectural Barriers Act

American Concrete Pavement Association

Americans with Disabilities Act

American Forest and Paper Association

Asphalt Institute

American Institute of Architects

American Railway Association

American Railway Engineering Association

American Society of Civil Engineers

American Standard Code for Information Interchange

American Society of Landscape Architects

Bureau of Land Management

Federal Test Method Standard

General Services Administration

Institute of Electrical and Electronic Engineers

Military Specifications

Mine Safety and Health Administration

National Electrical Safety Code

National Forest Products Association

Portland Cement Association

Society of Automotive Engineers

United States Forest Service

United States Geological Survey

United States Postal Service

West Coast Lumber Inspection Bureau

Western Wood Preservers Institute

Add the following to (b) U.S. Customary unit abbreviations and symbols:

hr mp ppm

Hour

Milepost

Part Per Million

101.04 Definitions. Delete the definitions for the following terms:

Bid

Bidder

Modify the following definitions as follows:

Contract Time – Delete this definition and substitute the following:

Period of Performance (POP) – The specified time allowed for completion of contract work.

Notice to Proceed – Delete this definition and substitute the following:

Notice to Proceed – Written notice from the Contracting Officer to the Contractor to begin the contract work.

Add the following:

Maximum Particle Size – The smallest sieve opening through which all particles in the material will pass.

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.

Protected Streamcourse – A drainage shown on the plans that requires designated mitigation measures.

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.

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

Section 102. – BID, AWARD, AND EXECUTION OF CONTRACT

Delete this section in its entirety.

Section 103. – SCOPE OF WORK

103.02 Disputes. Delete in its entirety.

103.03 Value Engineering. Delete in its entirety.

103.04 Contractor Records. Delete in its entirety.

103.05 Partnering. Delete in its entirety.

Section 104. – CONTROL OF WORK

104.01 Authority of the Contracting Officer (CO). Delete in its entirety.

104.02 Authority of Inspectors. Delete in its entirety.

104.03 Specifications and Drawings.

(c) As-built drawings. Modify the first sentence to read as follows: Use one set of Contractor-provided plans exclusively for as-built drawings.

(d) Submittals. Add this section:

1. Daily Logs.

2. Section 207 – Geotextile Production Certification.

3. Section 301 – Aggregate Gradation Test Results.

4. Section 301 – Surface Course Plasticity Index Test Results

5. Section 601 – Minor Concrete Structures

6. Section 602 – Culvert & Band Production Certifications.

7. Section 616 – Articulating Concrete Block System Manufacturer’s certificates, shop drawings

8. Section 725 – Manufacturer’s certificates, shop drawings, hydraulic testing results.

104.04 Coordination of Contract Documents. Delete in its entirety.

And Replace with the Following:

The only staking which will be performed by the Government is to indicate sections where work is to begin and where work is to end. All other required staking shall be the responsibility of the Contractor.

Segments shown on the map indicate areas where work may be performed.

Section 105. – CONTROL OF MATERIAL

105.01 Source of Supply and Quality Requirements. - Delete in its entirety.

105.02(a) Government-provided sources. Delete in its entirety.

105.02(b) Government-provided sources. Delete in its entirety:

105.03 Government-provided sources. Delete in its entirety.

105.05 Use of Material Found in the Work. Delete in its entirety.

105.06 Material Source Restoration. Delete in its entirety.

Section 106. – ACCEPTANCE OF WORK

106.05 Statistical Evaluation of Work and Determination of Pay Factor. Delete in its entirety, including all references to Statistical Evaluation. All references to Section 106.05 shall be replaced with references to Section 106.04 Measured or Tested Conformance.

Section 107. – LEGAL RELATIONS AND RESPONSIBILITY TO THE PUBLIC

107.01 Laws to be Observed. Delete in its entirety.

107.02 Protection and Restoration of Property and Landscape. Delete in its entirety.

107.03 Bulletin Board. Delete in its entirety.

107.05 Responsibility for Damage Claims. Delete in its entirety.

107.06 Contractor’s Responsibility for Work. Delete in its entirety.

107.09 Legal Relationship of the Parties. Delete in its entirety.

107.10 Environmental Protection.

(e) Project Specific Environmental Protection. Add this section:

Prior to mobilizing equipment to the site, all mechanical equipment and vehicles shall be cleaned of all vegetation (stems, leaves, seeds, and all other vegetative parts) in order to minimize the transport of invasive plant species.

Section 108. – PROSECUTION AND PROGRESS

Delete this section in its entirety.

Section 109. – MEASUREMENT AND PAYMENT

109.03 Weighing Procedures and Devices. Delete in its entirety.

109.06 Pricing of Adjustments. Delete in its entirety.

109.07 Eliminated Work. Delete in its entirety.

109.08 Progress Payments. Delete in its entirety.

109.09 Final Payment. Delete in its entirety.

Section 156. – PUBLIC TRAFFIC

Replace Section 156 in its entirety with the following:

Description

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

See FAR Clause 52.236-13 Accident Prevention.

Material

156.02 Conform to the following Section:

Temporary traffic control ………………………………………………… 635

Construction Requirements

156.03 Accommodating Traffic During Work. Perform work in a manner that ensures the safety and convenience of the public and protects the residents and property adjacent to the project. Accommodate public vehicle and foot traffic access to the recreational site. Contractor shall submit a construction schedule with requested road closure dates for approval by the Contracting Officer.

156.04 Maintaining Roadways During Work. Maintain roadways as follows:

(a) Maintain intersections with trails, roads, streets, businesses, parking lots, residences, garages, farms, and other features;

(b) Snow removal to facilitate the work is the Contractor’s responsibility.

(c) Maintain a dust-free traveled way such that visibility and air quality are not affected, and a hazardous condition is not created;

(d) Remove accumulations of soil and other material from traveled way;

(e) Do not allow water to pond on the traveled way; and

(f) Maintain the roadway, detours, and diversions in a safe and acceptable condition.

If corrective action is requested and the corrective action is not taken immediately, the condition may be corrected, and the cost of the corrective action deducted from monies due the Contractor.

156.05 Maintaining Roadways During Non-Work Periods. Maintain recreation site access and traffic control for public traffic at the end of each workday and during periods when work is not in progress.

156.06 Nighttime Operations. Perform construction operations during the hours of daylight (one-half hour after sunrise to one-half hour before sunset).

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

Traffic control devices and services will be evaluated under Section 635.

Measurement and Payment.

156.11 Do not measure controlling and protecting public traffic for payment. See Subsection 109.05.

Measure temporary traffic control under Section 635.

Section 203. – REMOVAL OF STRUCTURES AND OBSTRUCTIONS

Replace Section 156 in its entirety with the following:

203.01 This work consists of salvaging, removing, and disposing or (1) existing 18-inch x 30-foot corrugated metal culvert pipe and all accessories.

203.02 Material. Conform to the following Section and Subsection:

Backfill material.........................................................704.03

203.04 Removing Material. Completely remove existing corrugated metal culvert pipe and all accessories within the roadway to permit installation of new construction. Use methods required to complete the work within limitations of governing regulations.

203.05 Disposal of Material. After removal of the existing culvert pipe demolition waste becomes property of the Contract. Legally dispose of removed culvert pipe and waste materials including trash and debris off Government property.

Measurement – THIS SUBSECTION NEEDS TO UPDATED TO APPLY FOR SECTION 203

204.16 Delete this subsection in its entirety and replace with the following:

Do not measure removal of structures and obstructions work under this Section directly for payment.

Measurement for work specified under this Section shall be incidental to the Section ordering the work.

Payment

204.17 Delete this subsection in its entirety and replace with the following:

The accepted quantities will be incidental to the contract price per unit of measurement for the pay items listed in the bid schedule associated with the Section 602. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05.

Section 204. – EXCAVATION AND EMBANKMENT

204.03 Material. Delete in its entirety and replace with the following:

204.03 Material. Conform to the following Subsections:

Water ……………………………………………725.01(c)

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

(a) Subgrade Compaction. While grading roadway to specified dimensions scarify materials to a minimum of 6 inches below original grade. Adjust the moisture content of existing materials to a moisture content suitable for compaction. Compact each layer of material fill width with one of the following and until there is no visible evidence of further consolidation:

(1) Four roller passes of a vibratory roller having a minimum dynamic force of 40,000 pounds

(180 kilonewtons) impact per vibration and a minimum frequency of 1000 vibrations per minute;

(2) Eight roller passes of a 20-ton (20-metric ton) compression-type roller; or

(3) Eight roller passes of a vibratory roller having a minimum dynamic force of 30,000 pounds

(130 kilonewtons) impact per vibration and a minimum frequency of 1000 vibrations per minute.

(b) Aggregate Compaction. Place material by end dumping or belly dumping to the minimum depth needed for operation of spreading equipment. Adjust the moisture content of existing materials to a moisture content suitable for compaction. Compact each layer of material fill width with one of the following and until there is no visible evidence of further consolidation:

(4) Four roller passes of a vibratory roller having a minimum dynamic force of 40,000 pounds

(180 kilonewtons) impact per vibration and a minimum frequency of 1000 vibrations per minute;

(5) Eight roller passes of a 20-ton (20-metric ton) compression-type roller; or

(6) Eight roller passes of a vibratory roller having a minimum dynamic force of 30,000 pounds

(130 kilonewtons) impact per vibration and a minimum frequency of 1000 vibrations per minute.

Measurement

204.16 Delete this subsection in its entirety and replace with the following:

Do not measure excavation and embankment work under this Section directly for payment. Measurement for work specified under this Section shall be incidental to the Section ordering the work.

Payment

204.17 Delete this subsection in its entirety and replace with the following:

The accepted quantities will be incidental to the contract price per unit of measurement for the pay items listed in the bid schedule associated with the Sections ordering the work. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05.

Section 207. – EARTHWORK GEOSYNTHETICS

207.01 Description. Delete in its entirety and replace with the following:

207.01 This work consists of furnishing and installing geotextile in a separation application under articulating concrete block system.

Geosynthetics are designated according to the tables in Section 714.

207.02 Material. Delete in its entirety and replace with the following:

207.02 Material. Conform to the following Section and Subsection:

Geotextile……………………………………………714.01

207.08 Measurement. Delete the first sentence and replace with the following:

Do not measure work under this Section directly for payment. Measurement for work specified under this

Section shall be incidental to Section 616.

207.09 Payment. Delete in its entirety and replace with the following:

The accepted quantities will be paid at the contract price per unit of measurement for the Section 616 pay item listed in the bid schedule. Payment will be full compensation for the work prescribed in this

Section. See Subsection 109.05 (b).

Section 209. – STRUCTURE EXCAVATION AND BACKFILL

209.01 Description. Delete in its entirety and replace with the following:

209.01 This work consists of bedding and backfill for the construction of the corrugated metal culvert pipe and articulating concrete block system.

209.02 Material. Delete in its entirety and replace with the following:

209.02 Material. Conform to the following Section and Subsection.

Backfill material ........................................................704.03

Bedding material .......................................................704.02

209.08 Bedding. Delete Subsection 209.08 (a) in its entirety and add the following:

(c) For Articulating Concrete Block System. Orient subgrade as shown in Section 301 Figure 1 –

Typical Cross Section. Install geotextile on subgrade as specified in Section 207. Place uncompacted bedding material over the geotextile and compact to a thickness of 6-inches according to Subsection

209.10.

209.10 Compacting. Delete this Subsection in its entirety and replace with the following:

Adjust the moisture content of the backfill material to a moisture content suitable for compaction.

Fill the voids around the rock in each layer with earth or other fine material. Compact each layer until there is no visible evidence of further consolidation.

Section 301. – UNTREATED AGGREGATE COURSES

301.03 General. Delete in its entirety and replace with the following:

Prepare the surface of roadbeds and (2) parking areas on which the aggregate course is placed according to

Section 303. Material to be placed shall be a Base (A or B) aggregate and Surface course aggregate as specified in Section 703. Rolling and watering is required. Water for this contract is not provided by the

Government. Base aggregate shall be placed to a compacted depth of 6 inches and surface course aggregate shall be placed to a compacted depth of 6 inches. Travel way widths shall match existing travel way widths with a minimum travel way of 14 feet, oriented as shown on Figure 1 – Typical Cross-Section.

Parking areas widths shall match existing parking area footprints.

Figure 1. – Typical Cross-Section

301.04 Mixing and Spreading. Delete the first sentence of the first paragraph and add the following:

Determine the adequate moisture content to obtain the necessary compaction results according to field trial. Obtain approval (of adequate moisture content) by the Contracting Officer prior to rolling. No other additives will be required.

301.05 Compacting. Delete and replace with the following:

Compact each layer full width. Roll from the sides to the center, parallel to the centerline of the road.

Along curbs, headers, walls, and all places not accessible to the roller, compact the material with approved tampers or compactors. Blade the surface of each layer during the compaction operations to remove irregularities and produce a smooth, even surface. Compact the aggregate using the following method as specified:

Aggregate Compaction. Operate rollers and compact as specified in Subsection 204.11(b).

Table 301-1 Modify as follows:

Remove all Sampling, Testing, and Acceptance Requirements rows except for the row under

Finished Product titled “Subbase, base, or surface course aggregate”.

Under the “Characteristic” column, add “conformance to typical drawing” to “Surface tolerance & grade”.

303 – RECONDITIONING

Replace Section 303 in its entirety with the following:

303.01 This work consists of reconditioning ditches, shoulders, roadbeds, and (2) parking areas within the Challis Bridge Recreation Site according to Figure 1 - Typical Cross-Section of Section 301. Work includes road reconditioning and reconditioning parking areas to create positive drainage. Work requires the use of a water tender and compaction equipment. Roadways and parking area locations are shown on the drawings.

303.02 Blading and Shaping. Prepare the surface as shown on Figure 1 – Typical Cross-Section. This includes conditioning or constructing ditches, crown, and furrow ditches into and adjacent to an existing road. Improvements shall be completed when adequate moisture is present or when adequate moisture is not present, a water tender shall be required to deliver water to the section of road requiring improvement. The Contractor shall apply enough water to the area being improved such that the material is at an optimum moisture content, suitable for compaction. A roller shall also be required for use on areas being improved. The road shall be improved to keep drainage functional (including ditch cleaning of branches, large rocks, and/or other water drainage blockers and cleaning of the culverts to remove branches, large rocks, and sediment greater than 2 inches in depth). End product shall be in compliance with the following:

a. Shall be constructed to the shape shown in the typical template.

b. Roads shall be improved to existing travel way width and a minimum travel way of 14’.

c. Shall be compacted with water and compactive effort in accordance with Subsection 303.04.

303.03 Drainage. Grade the ditches to the typical sections (Figure 2) and construct new furrow ditches as directed by the Contracting Officer (CO).

303.04 Compaction. Compact the Subgrade of the travel way, shoulders, and parking areas with the following method as specified:

Subgrade Compaction. Operate rollers and compact as specified in Subsection 204.11(a).

Figure 2 - Typical Furrow Ditch

303.05 Acceptance. Road reconditioning work will be evaluated under Subsections 106.02 and 106.04.

Measurement

303.06 Measure the Section 303 pay items listed in the bid schedule according to Subsection 109.02.

Payment

303.06 The accepted quantities will be paid at the contract price per unit of measurement for the Section

303 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this

Section. See Subsection 109.05.

Section 601. — MINOR CONCRETE STRUCTURES

08/17/24–FP14

601.03 Composition (Concrete Mix Design).

Table 601-1, Composition of Minor Concrete. Under 28-day compressive strength, replace Specification with “4,000 pounds per square inch minimum”.

Measurement

601.08 Minor concrete work is incidental to Section 616 and not measured separately for payment.

Payment

601.09 The accepted quantities will be incidental to the contract price per unit of measurement for the

Section 616 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05.

602 – CULVERTS AND DRAINS

602.01 Description. Delete in its entirety and replace with the following:

602.01 This work consists of furnishing 14 gage – 30-inch corrugated metal culvert pipe. Fill material for the culvert shall be Contractor furnished surface aggregate for bedding and backfill.

602.02 Material. Conform to the following Section and Subsection.

Metal pipe .................................................................707.02

Gasket for metal pipe ................................................707.17

Plastic pipe ................................................................708.02(a)

Gasket for plastic pipe ..............................................708.08

602.03 General. Delete in its entirety and replace with the following:

602.03 General. Furnish culvert pipe conforming to AASHTO M36 and as specified:

Culvert ID CORR-METAL

Diameter (in) 30

Gage No. 14

Corrugation 2-1/2” x ½”

Load Rating H-20 Live Load

Perforated No

Drawings show location of the culvert pipe replacement. Determine final location, skew, length, elevations, and grade according to Section 152. Do not order culvert pipe material until the Contracting

Officer has accepted the final structure size, length and alignment.

Remove and dispose of existing culvert pipe according to Section 203.

Excavate and backfill according to Section 209.

Section 616. — ARTICULATED CONCRETE BLOCK PAVING

08/17/24–FP14

Replace Section 616 in its entirety with the following:

Description

616.01 This work consists of constructing articulating concrete block system on travelled way. System includes geotextile fabric, bedding, surface fill material and concrete grout.

Reinforced geotextile is designated according to Tables 714-5 and 714-6.

Material

616.02 Conform to the following Sections and Subsections:

Minor concrete

Surface course aggregate ...........................................703.05

Bedding material ........................................................704.02

Reinforcement geotextile

Construction Requirements

616.03 General. Excavate and backfill according to Section 209 unless otherwise noted. Place and compact bedding material with at least three passes of a lightweight mechanical tamper, roller, or vibratory system.

Geotextile fabric shall be installed under the placement of bedding course with a compacted thickness of

6-inches. Surface fill material shall be surface course aggregate.

Location of the articulating concrete block system installation shall be staked by the Government before start of work.

616.04 Articulating Concrete Block System. System shall be basis of design or approved equal.

Basis of design: Contech ArmorFlex Class 55 Closed Block or approved equal.

Physical Requirements: At the time of delivery to the work site, the units shall conform to the physical requirements prescribed in Table 1 below.

TABLE 725-1

PHYSICAL REQUIREMENTS

Compressive Strength Net Area

Min. p.s.i (mPa)

Water Absorption

Max. lb/ft (kg/m

Avg. of 3 units Individual Unit Avg. of 3 units Individual Unit

4,000 (27.6) 3,500 (24.1) 9.1 (160) 11.7 (192)

Visual Inspection: All units shall be sound and free of defects that would interfere with either the proper placement of the unit or impair the performance of the system. Surface cracks incidental to the usual methods of manufacture, or surface chipping resulting from customary methods of handling in shipment and delivery, shall not be deemed grounds for rejection.

Cracks exceeding 0.25 inches (.635 cm) in width and/or 1.0 inch (2.54 cm) in depth shall be deemed grounds for rejection. Chipping resulting in a weight loss exceeding 10% of the average weight of a concrete unit shall be deemed grounds for rejection.

Blocks rejected prior to delivery from the point of manufacture shall be replaced at the manufacturer's expense. Blocks rejected at the job site shall be repaired with structural grout or replaced at the expense of the Contractor.

The articulating concrete block system shall have the following nominal characteristics:

STANDARD SIZES OF ARMORFLEX® BLOCKS

CLASS TYPE

MIN.

WEIGHT

(lbs)

BLOCK SIZE

OPEN

AREA %

Length

(in)

Width

(in)

Height*

(in)

55BAAH Closed 91 17.4 15.5 6.0 10

*Block height may vary based on local manufacture’s capabilities.

Characteristics of systems submitted as “equal to” basis of design product may not vary from these characteristics by more than 10%.

616.05 Subgrade & Bedding Preparation.

General: All subgrade preparation shall be performed in accordance with ASTM D 6884, Standard

Practice for Installation of Articulating Concrete Block (ACB) Revetment Systems, as updated and amended.

Grading: The travel way location that is staked for articulating concrete block installation shall be graded as shown in Section 301, Figure 1 – Typical Cross-Section. All grade deformities, roots, grade stakes, and stones which project normal to the local grade face must be re-graded or removed. No holes, "pockmarks", grade board teeth marks, footprints, or other voids greater than 1.0 inch in depth normal to the local grade face shall be permitted. No grooves or depressions greater than 0.5 inches in depth normal to the local grade face with a dimension exceeding 1.0 foot in any direction shall be permitted. Where such areas are evident, they shall be brought to grade by placing compacted homogeneous material. The grade and grade face shall be uniformly compacted, and the depth of layers, homogeneity of soil, and amount of compaction shall be as required by the Contracting Officer.

Geotextile fabric shall be placed on subgrade as specified in Section 207. Bedding course shall be placed on the geotextile fabric at a compacted thickness of 6-inches.

Excavation and preparation for anchor trenches, side trenches, and toe trenches or aprons shall be done in accordance with the Contech Armorflex Class 55 Small Standard Termination Details. Follow the Flank

Termination detail along the sides of the road and the Toe and Top Termination details at the beginning and end termini of the articulating concrete block system. The anchor trench hinge-point at the top of the slope shall be uniformly graded so that no dips or bumps greater than 0.5 inches over or under the local grade occur. The width of the anchor trench hinge-point shall also be graded uniformly to assure intimate contact between all articulating concrete blocks and the underlying grade at the hinge-point.

Inspection: Immediately prior to placing the filter fabric and articulating concrete blocks, the prepared subgrade shall be inspected by the Contracting Officer’s Representative. No fabric or blocks shall be placed thereon until that area has been approved by the Contracting Officer.

616.06 Placement of Articulating Concrete Blocks.

General: Articulating concrete block placement and preparation should be performed in accordance with

ASTM D 6884, Standard Practice for Installation of Articulating Concrete Block (ACB) Revetment

Systems, as amended and updated. Articulating concrete blocks, as specified in Part 2 of these

Specifications, shall be constructed at the location shown on the Contract Drawings and in accordance with Contech Armorflex Class 55 Small Standard Termination Details.

Placement: The articulating concrete blocks shall be placed on the filter fabric in such a manner as to produce a smooth plane surface in intimate contact with the filter fabric. No individual block within the plane of placed articulating concrete blocks shall protrude more than one-half inch or as otherwise specified by the Contracting Officer. To ensure that the articulating concrete blocks are flush and develop intimate contact with the subgrade, the blocks shall be "seated" with a roller or other means as approved by the Contracting Officer.

Anchor trenches and side trenches shall be backfilled and compacted flush with the top of the blocks. The integrity of a soil trench backfill must be maintained so as to ensure a surface that is flush with the top surface of the articulating concrete blocks for its entire service life. Toe trenches shall be backfilled in accordance with Contech Armorflex Class 55 Small Standard Termination Details. Backfilling and compaction of trenches shall be completed in a timely fashion. No more than 500 linear feet of placed articulating concrete blocks with non-completed anchor and/or toe trenches shall be permitted at any time.

Finishing: The cells or openings in the articulating concrete blocks shall be backfilled and compacted immediately with surface course aggregate as specified in Section 703 to assure there are no voids and so that compacted material extends from the filter fabric to one inch above the surface of the articulating concrete block. Backfilling and compaction shall be completed in a timely manner so that no more than

500 linear feet of exposed mats exist at any time.

616.07 Acceptance.

Articulating concrete block system will be evaluated under Subsections 106.02 and 106.03. The Contractor shall submit shop drawings, evidence of full-scale hydraulic testing in accordance with ASTM D-7277, and manufacturer’s certificates of compliance for the articulating concrete blocks and all components for Contracting Officer approval before fabrication.

Bedding material will be evaluated under Subsections 106.02 and 106.04.

Slope paving construction will be evaluated under Subsections 106.02 and 106.04.

Reinforcement geotextile will be evaluated under Section 207.

Excavation and backfill will be evaluated under Section 209.

Minor concrete will be evaluated under Section 601.

Measurement

616.08 Measure the Section 616 pay items listed in the bid schedule according to Subsection 109.02.

Payment

616.09 The accepted quantities will be paid at the contract price per unit of measurement for the Section

616 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this

Section. See Subsection 109.05.

714 – GEOSYNTHETIC MATERIAL

Replace Section 714 in its entirety with the following:

714.01 Geotextile.

The geotextile filter shall meet the minimum physical requirements listed in Table 714-1 of this

Section. Consultation with the manufacturer is recommended; the standard for sizing geotextile for these applications is AASHTO M-288, Permanent Erosion Control. Only non-woven geotextiles are acceptable.

The geotextile fiber shall consist of a long-chain synthetic polymer composed of at least 85 percent by weight of propylene, ethylene, ester, or amide. The edges of the geotextile shall be finished to prevent the outer fiber from pulling away from the geotextile.

The Contractor shall submit the manufacturer's certified test results showing actual test values obtained when the physical properties are tested for compliance with the specifications.

During all periods of shipment and storage, the filter fabric shall be protected from direct sunlight, UV radiation, and temperatures greater than 140°F. To the extent possible, the fabric shall be maintained wrapped in its protective covering. The geotextile shall not be exposed to sunlight or

UV radiation until the installation process begins.

At the time of installation, the filter fabric shall be rejected if it has been removed from its protective cover for over 72 hours or has defects, tears, punctures, flow deterioration, or damage incurred during manufacture, transportation or storage. With the acceptance of the Contracting

Officer, placing a filter fabric patch over the damaged area prior to placing the mats shall repair a torn or punctured section of fabric. The patch shall be large enough to overlap a minimum of three

(3) feet in all directions.

Table 714-1

Physical Requirements

Physical Property Test Procedure Minimum Value

Grab Tensile Strength

(Unaged Geotextile)

ASTM D4632

IAW AASHTO M288 Class

Breaking Elongation

(Unaged Geotextile)

ASTM D4632

50% max.

(in any principal direction)

Burst Strength ASTM D3786

Puncture Strength ASTM D4833

A.O.S., U.S. Std. Sieve ASTM D4751 #70 or Finer

Permittivity ASTM D4491 0.7

725 – MISCELLANEOUS MATERIAL

725.19 Articulating Concrete Block System. Furnish submittal with evidence of conformance with the following:

Articulating concrete block system ASTM D 6684