A2 Attachment 3 Stabilization MATOC_Sample Project_TSpecs_02NOV2022.pdf

Solicitation No. W912P522R0001 Task Order Sample

US Army Corps Of Engineers Nashville District

Stabilization MATOC Sample Project

Tennessee River Basin & Cumberland River Basin

TN, KY, AL, MS, VA, NC, GA

Technical Specifications - Phase II Sample Project

November 2022

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Stabilization MATOC Tennessee and Cumberland River Basins W912P522R0001 Task Order (Sample Project) TN, KY, AL, MS, VA, NC, GA

PROJECT TABLE OF CONTENTS

DI VI SI ON 01 - GENERAL REQUI REMENTS

01 11 00 Task Order (Sample Project) SUMMARY OF WORK

DI VI SI ON 31 - EARTHWORK

31 32 19.13 GEOGRID SOIL STABILIZATION

31 32 39 BIOENGINEERING PRACTICES FOR STREAM BANK AND SHORELINE

STABILIZATION

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PROJECT TABLE OF CONTENTS Page 1

PROJECT TABLE OF CONTENTS Page 2

SECTION TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

SECTION 01 11 00

Task Order (Sample Project) SUMMARY OF WORK

PART 1 GENERAL

1.1 SAMPLE PROJECT FOR EVALUATION OF DESIGN/BUILD CAPABILITIES

1.1.1 Sample Project Items Provided to the Contractor

1.2 GENERAL SCOPE OF WORK

1.2.1 STATION 1+50 TO 11+00

1.2.2 STATION 11+00 TO 16+50

1.3 WORK COVERED BY CONTRACT DOCUMENTS

1.3.1 Project Description

PART 2 PRODUCTS

PART 3 EXECUTION

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SECTION 01 11 00 Page 1

SECTION 01 11 00 Page 2

SECTION 01 11 00

Task Order (Sample Project) SUMMARY OF WORK

PART 1 GENERAL

1.1 SAMPLE PROJECT FOR EVALUATION OF DESIGN/BUILD CAPABILITIES

Provide a 100% design for streambank stabilization of an unidentified river segment. Design is to include drawings, quantities/bid schedule, and cost estimate. Design will be used by Government for evaluation of offerors in the Phase II selection. This design is for evaluation purposes only and will not be constructed. Complete design under the assumption that all staging and mobilization must be completed by and confined to barge/floating plant.

1.1.1 Sample Project Items Provided to the Contractor

Along with this document, the Contractor has been provided photos of the site, a plan view drawing that shows extent of project, work limits, and existing contours, cross sections of the existing surface in need of stabilization, and a bid schedule template. Contractor has been provided the plan view of the site in both CAD and PDF formats. Cross sections are only provided in CAD format.

Unless specifically noted otherwise in this SUMMARY OF WORK, all requirements of the base MATOC contract shall apply to this Sample Project. The requirements of this document, the Items Provided, and the Base MATOC will be use to fully design the streambank stabilization sample project to include drawings, quantities/bid schedule, and cost estimate which will be used for evaluation for Phase II selection.

1.2 GENERAL SCOPE OF WORK

Approximately 1,500 linear feet of streambank is to be armored along the right descending bank of the channel. The purpose of this armoring is to provide a cost-effective means to prevent the failure of the adjacent roadway, utilities and buildings due to ongoing erosion. The preferred solution is as follows:

1.2.1 STATION 1+50 TO 11+00

Armoring should typically be placed between Elevations 380’ (top) and Elevation 350’ (bottom), keying in the riprap at the toe (key should stop at Elevation 350'). However, where the existing bank slope is over-steepened, the riprap should not be keyed in at the bottom but extended all the way down to Elevation 320’ – 330’ (or bedrock outcrops where present). Note that armoring will not be able to be extended up to Elevation 380' at Station 9+50 due to the old bridge abutment. Riprap layer thickness is to be at least 2’, and the top stone size is 16”. Well graded riprap should not be placed steeper than 2H:1V and should include geotextile drainage layer between the armoring and the loose alluvial soils on the existing surface. Additional consideration is necessary to ensure near the top of the slope that geotextile is implemented such that runoff is not able to erode a path behind the geosynthetic causing a loss of contact between the filter and the armoring. The geotextile should be

SECTION 01 11 00 Page 3 terminated at Elevation 350’ due to constraints with the river elevation.

Work will also include clearing and grubbing of existing trees and debris.

Bare areas above the repair are to be seeded. The area to be armored extends from Station 1+50 to 16+50. End protection will be required at both the upstream and downstream limits. Note that any utilities such as the box culvert near Station 12+00 are not to be blocked by riprap or to have geotextile placed beneath.

1.2.2 STATION 11+00 TO 16+50

This reach will deviate from the criteria above as follows: Between Elevation 370' and 380', bank should be repaired by means of bio-engineered fill instead of riprap armoring. Proposed design should convey fill geometry, planting layout, and if applicable, filters, additional stabilization components, and/or etc. Assume that any excavated fine soil will be unsuitable for the bio-engineered fill. Shrub/tree planting layout should be a grid with spacing equal to 8 linear feet/64 square feet.

1.3 WORK COVERED BY CONTRACT DOCUMENTS

1.3.1 Project Description

The work includes bank stabilization, bioengineering, and incidental related work. The Contractor is to provide a 100% design to the government based on the requirements herein and using the CAD data provided in the sheet submitted with this RFP. No additional survey efforts or site investigations are necessary for the design or evaluation. The following has been provided by the Government:

Drawings:

1) STABILIZATION MATOC_SAMPLE PROJECT_SITE PLAN_SHEET

2) Existing Cross Section Sheets (1 of 4)

3) Existing Cross Section Sheets (2 of 4)

4) Existing Cross Section Sheets (3 of 4)

5) Existing Cross Section Sheets (4 of 4)

PDFs:

1) Photos

2) STABILIZATION MATOC_SAMPLE PROJECT_SITE PLAN_SHEET-Plot-000

Spreadsheets:

1) Sample Project Bid Schedule

PART 2 PRODUCTS

Not used.

PART 3 EXECUTION

Not used.

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SECTION 01 11 00 Page 4

SECTION TABLE OF CONTENTS

DIVISION 31 - EARTHWORK

SECTION 31 32 19.13

GEOGRID SOIL STABILIZATION

PART 1 GENERAL

1.1 REFERENCES

1.2 SUBMITTALS

1.3 QUALITY ASSURANCE

1.4 DELIVERY, STORAGE, AND HANDLING

1.4.1 Handling

1.4.2 Storage

PART 2 PRODUCTS

2.1 GEOGRID REINFORCEMENT

2.1.1 Geogrid Reinforcement Properties

2.1.2 Allowable Strength

2.2 SPLICES

PART 3 EXECUTION

3.1 INSTALLATION

3.1.1 Surface Preparation

3.1.2 Placement

3.1.3 Overlaps and Fasteners

3.1.4 Splices

3.1.5 Penetrations

3.1.6 Stacked Geogrid Layers

3.2 COVER SOIL PLACEMENT

3.3 OVERSIGHT

3.4 PROTECTION AND BACKFILLING

SECTION 31 32 19.13 Page 1

SECTION 31 32 19.13 Page 2

SECTION 31 32 19.13

GEOGRID SOIL STABILIZATION

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM D4355/D4355M (2014) Deterioration of Geotextiles from Exposure to Light, Moisture and Heat in a Xenon-Arc Type Apparatus

ASTM 5262 (2021) Standard Test Method for Determining the Unconfined Tension Creep and Creep Rupture Behavior of Planar Geosynthetics Used for Reinforcement Purposes

ASTM D6706 (2021) Standard Test Method for Measuring Geosynthetic Pullout Resistance in Soil

ASTM INTERNATIONAL (ASTM)

GSI GRI GC4a (1991) Determination of the Long-Term Design Strength of Stiff Geogrids

GSI GRI GC4b (1991) Determination of the Long-Term Design Strength of Flexible Geogrids

1.2 SUBMITTALS

Government approval is required for submittals with a "G" classification.

Submittals not having a "G" classification are for information only.

Submit the following in accordance with Section 01 33 00 SUBMITTAL

PROCEDURES:

SD-02 Shop Drawings

Installation; G

Typical Geogrid layout plan, with sequencing and construction procedures, a minimum of 30 days prior to geogrid placement.

SD-03 Product Data

Allowable Strength; G

SECTION 31 32 19.13 Page 3

Geogrid allowable strength calculated in accordance with GSI GRI GG4a or GSI GRI GG4b. The calculations shall itemize each reduction factor. Account for splice efficiency in the calculations. Provide calculations a minimum of 30 days prior to delivery of geogrid to the site.

Manufacturer; G

Summary of manufacturer's qualifications a minimum of 30 days prior to delivery of geogrid to the site. Manufacturer's quality control (QC) manual a minimum of 7 days prior to the delivery of geogrid to the site.

SD-04 Samples

Geogrid Reinforcement; G

One properly identified 24 by 24 inches minimum size geogrid sample with the fasteners proposed for use.

SD-06 Test Reports

Geogrid Reinforcement; G

Manufacturer's certified raw and roll material test reports including ultimate strength performed in accordance with ASTM D 6637 or ASTM D 4595 (modified). Test results not meeting the requirements in Table 1 or in the approved Manufacturer's Quality Control Manual will result in rejection of applicable rolls.

Provide certified test reports a minimum of 30 days prior to delivery of geogrid to the site.

Splices; G

Test data showing splice efficiency. Provide certified test results a minimum of 7 days prior to delivery of geogrid to the site.

SD-07 Certificates

Certificates of Compliance; G

An affidavit certifying raw and roll material test results submitted are accurate and that the reinforcement meets the requirements of the project specifications. The affidavit shall be signed by an official authorized to certify on behalf of the manufacturer. If the affidavit is dated before award of the contract and/or is not specific to the project, the supplier shall attach a statement certifying that the affidavit addressed to the wholesale company is representative of the material supplied. The documents shall include a statement confirming that all purchased resin used to produce reinforcement is virgin resin. Provide affidavit a minimum of 30 days prior to delivery of geogrid to the site.

1.3 QUALITY ASSURANCE

Submit a summary of the manufacturer's qualifications and 2 copies of the

SECTION 31 32 19.13 Page 4 manufacturer's quality control manual, as specified in the Submittals paragraph. The reinforcement manufacturer shall provide a qualified and experienced representative to be available on an as-needed basis during construction. The representative shall visit the site for consultation at least once during construction.

1.4 DELIVERY, STORAGE, AND HANDLING

The QC inspector shall be present during delivery and unloading of the geogrid. Ensure the geogrid has not been damaged during shipping, storage, or handling. Any found to be damaged shall be repaired or replaced. Accept delivery of material only after the required submittals have been approved. Each roll shall be labeled with the manufacturer's name, product identification, lot number, roll number, and roll dimensions. Store the rolls in a level and dry area. Protect the materials from damage and exposure following the guidelines presented in

ASTM D 4873.

1.4.1 Handling

Handle and unload geogrid rolls by hand, or with load carrying straps, a fork lift with a stinger bar, or an axial bar assembly. Geosynthetic rolls shall not be dragged, lifted by one end, lifted by cables or chains, or dropped to the ground.

1.4.2 Storage

Protect geogrid from deleterious materials, chemicals, sparks and flames, temperatures in excess of 160 degrees F, and any other environmental condition that may degrade the physical properties. If stored outdoors, the rolls shall be elevated from the ground surface. Protect geogrids, except for extruded grids, with an opaque waterproof cover.

PART 2 PRODUCTS

2.1 GEOGRID REINFORCEMENT

Provide a geogrid that is a geosynthetic manufactured for reinforcement applications and a regular network of integrally connected polymer tensile elements with aperture geometry sufficient to permit significant mechanical interlock with the surrounding soil, aggregate, or other fill materials. The geogrid structure shall be dimensionally stable and able to retain its geometry under manufacture, transport and installation. The geogrid shall be manufactured with 100 percent virgin resin consisting of polyethylene, polypropylene, polyester, or other approved material and with a maximum of 5 percent in-plant regrind material. Polyester resin shall have a minimum molecular weight of 25,000 and a carboxyl end group number less than 30. Polyethylene and polypropylene shall be stabilized with long term antioxidants. Submit Certificates of Compliance for the materials provided as specified in the Submittals paragraph.

2.1.1 Geogrid Reinforcement Properties

The reinforcement shown on the contract drawings shall meet the property requirements listed in Table 1. Reinforcement strength requirements represent minimum average roll values in the machine direction.

SECTION 31 32 19.13 Page 5

TABLE 1 - geogrid reinforcement properties

PROPERTY REQUIREMENT TEST DESIGNATION

Allowable Strength (Ta) at 5 percent strain

1500 lb/foot GSI GRI GC4a or GSI GRI GC4b

UV Resistance 70 percent after 500 hours ASTM D4355/D4355M

Coefficient of Interaction for Pullout

0.85 ASTM D6706

2.1.2 Allowable Strength

Allowable strength is based on reduction factors for installation damage, durability, and creep that are applicable to site specific conditions.

Determine reduction factors in accordance with the test procedures documented in GSI GRI GC4a or GSI GRI GC4b . The minimum reduction factor for durability shall be 1.1 for polyethylene and polypropylene geogrids and 1.15 for coated polyester geogrids. The minimum reduction factor for installation damage shall be 1.1 for all polymers. The reduction factor for creep shall be based on testing performed in accordance with ASTM 5262 at the strain specified in Table 1.

2.2 SPLICES

Splices shall consist of a standard method or device recommended by the manufacturer of the geogrid. Splices will not be allowed unless identified on the approved layout drawings. Splices shall be at least 75 percent efficient. Demonstrate the splice efficiency through tests performed in accordance with GSI GRI GC4a or GSI GRI GC4b . Splicing may consist of overlaps, fusion wedge welding, sewing, or bodkin connections. Splicing methods that are dependent on installer experience and skill level, such as hot air and torch-applied open flame, are not acceptable. Construct overlap splices by placing a minimum of 2 inches of soil between the layers of geogrid.

PART 3 EXECUTION

3.1 INSTALLATION

3.1.1 Surface Preparation

Immediately prior to placement of the geogrid, the surface on which the geogrid will be placed shall be free of rock and other material that could damage the geogrid or the underlying geosynthetics.

3.1.2 Placement

The direction of reinforcement shall be perpendicular to the shoreline.

Install the geogrid in accordance with the Manufacturer's recommendations.

Unroll the geogrid in the direction of reinforcement. After a layer of geogrid has been placed, use suitable means, that do not damage the underlying geosynthetics, to hold the geogrid flat and in place until cover soil can be placed. Geogrid damaged during placement and covering shall be removed and replaced at no additional cost to the Government.

SECTION 31 32 19.13 Page 6

3.1.3 Overlaps and Fasteners

Adjacent rolls of geogrid shall be positioned edge-to-edge and loosely fastened to maintain alignment during fill placement. Adjacent rolls shall not be overlapped. Use fastener type and spacing as recommended by the manufacturer and approved by the Contracting Officer. Metallic fasteners will not be allowed.

3.1.4 Splices

Limit splicing to only one splice per reinforcing strip and no two consecutive reinforcing strips shall include a splice. Splices in geogrid reinforcement shall be pulled and held taut during cover soil placement.

3.1.5 Penetrations

For small penetrations through geogrids, only transverse members of the geogrid shall be cut. The load-carrying longitudinal (machine direction) members shall be spread around the penetration. For larger penetrations, additional geogrid shall be placed on each side of the penetration and spliced to the adjacent geogrid to compensate for any longitudinal tensile members that must be cut.

3.1.6 Stacked Geogrid Layers

When geogrid layers are to be stacked, stagger roll ends and edges so that joints do not lie above one another.

3.2 COVER SOIL PLACEMENT

Cover geogrid with soil within 5 calendar days of acceptance. Keep the geogrid smooth and taut during placement of cover materials. Cover soil shall not be dropped onto the geogrid from a height greater than 3 feet.

The soil shall be pushed out over the geogrid in an upward tumbling motion. The initial loose soil lift thickness shall be 12 inches. Use equipment with ground pressures less than 7 psi to place the first lift over the geogrid. A minimum of 24 inches of soil shall be maintained between construction equipment with ground pressures greater than 7 psi and the geogrid. Equipment placing cover soil shall not stop abruptly, make sharp turns, spin their wheels, or travel at speeds exceeding 5 mph.

Additional cover soil material and placement requirements are described in Section 31 23 23 SOIL FILL.

3.3 OVERSIGHT

Make repairs by placing a patch of the geosynthetic drainage layer over the damaged area. Extend the patch a minimum of 2 feet beyond the edge of the damage. Use approved fasteners, spaced every 6 inches around the patch, to hold the patch in place. If more than 25 percent of the roll width is damaged, approval must be obtained to repair or replace the damaged roll.

3.4 PROTECTION AND BACKFILLING

Keep a QC Representative present at all times during geogrid installation.

SECTION 31 32 19.13 Page 7

SECTION 31 32 19.13 Page 8

SECTION TABLE OF CONTENTS

DIVISION 31 - EARTHWORK

SECTION 31 32 39

BIOENGINEERING PRACTICES FOR STREAM BANK AND SHORELINE STABILIZATION

PART 1 GENERAL

1.1 SUMMARY

1.2 MEASUREMENT AND PAYMENT

1.2.1 Binder

1.3 SUBMITTALS

1.4 QUALITY ASSURANCE

1.4.1 Regulatory Compliance

1.4.2 Pre-Installation Conference

1.4.3 Substitutions

1.4.4 Qualifications

1.4.4.1 Installer's Qualification

1.4.4.2 Personnel Qualifications

1.5 DELIVERY, STORAGE, AND HANDLING

1.5.1 Vegetation

1.5.2 Earth Materials

1.6 PROJECT/SITE CONDITIONS

1.6.1 Existing Site Conditions

1.7 SEQUENCING AND SCHEDULING

PART 2 PRODUCTS

2.1 BINDERS

2.2 TOPSOIL

2.3 EROSION CONTROL ITEMS

2.3.1 Erosion Control Blanket

2.3.2 Coir Blankets

2.4 SEED

2.5 STAPLES

2.6 SYNTHETIC GRID AND SHEET SYSTEMS

2.7 CRUSHED ROCK, GRAVEL, SAND, STONE, RIPRAP, and BACKFILL

PART 3 EXECUTION

3.1 SITE VERIFICATION OF CONDITIONS

3.2 SITE PREPARATION

3.2.1 Temporary Construction Facilities

3.2.2 Erosion and Sediment Control

3.3 FIRE PREVENTION

3.4 SANITATION

3.5 TIME OF PLANTING

3.6 BIOENGINEERED STRUCTURES

3.6.1 Common Structures

3.6.1.1 Permanent Seeding

3.6.1.2 Shrub/Tree Planting

3.6.1.3 Live Fascine

SECTION 31 32 39 Page 1

3.6.1.3.1 Horizontal Fascines

3.7 FIELD QUALITY CONTROL

3.8 CLEAN-UP

3.9 DOCUMENTATION

3.9.1 Final Project Report

SECTION 31 32 39 Page 2

SECTION 31 32 39

BIOENGINEERING PRACTICES FOR STREAM BANK AND SHORELINE STABILIZATION

PART 1 GENERAL

1.1 SUMMARY

The work by the Contractor consists of furnishing and installing bioengineered features and structures. Submit design, details, cross sections and profiles of site engineered structures to enhance shoreline stability within project limits and in areas outside the project limits where the soil surface is disturbed from work under this contract .

Include in this work all necessary evaluation, design, materials, labor, supervision, and equipment for installation of a complete system and after construction maintenance. Submit a list of all equipment and tools that will be used for the construction of the bioengineered structure. Include information on products used in equipment such as fuel, hydraulic fluids, and the like. Coordinate this section with the requirements of Section 31 11 00 CLEARING AND GRUBBING and 35 31 19 STONE PROTECTION and all other specifications or requirements as necessary.

1.2 MEASUREMENT AND PAYMENT

1.2.1 Binder

Measure the standard binder by the linear placed.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" or "S" classification. Submittals not having a "G" or "S" classification are for Contractor Quality Control approval. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Existing Site Conditions

Site Evaluation Plan

Permits and Regulations

Construction Work Sequence Schedule

Seed Establishment Period

SD-02 Shop Drawings

Vegetation; G

SD-03 Product Data

Materials; G

SECTION 31 32 39 Page 3

Stakes

Binders

Fertilizer

Harvesting and Soaking Records

Erosion Control Blanket; G

Summary of manufacturer's qualifications a minimum of 30 days prior to delivery of material to the site. Manufacturer's quality control (QC) manual a minimum of 7 days prior to the delivery of material to the site.

Coir Blanket; G

Summary of manufacturer's qualifications a minimum of 30 days prior to delivery of material to the site. Manufacturer's quality control (QC) manual a minimum of 7 days prior to the delivery of material to the site.

SD-04 Samples

Soil; G

Excavated Sediments

SD-06 Test Reports

Material Testing

SD-07 Certificates

Installer's Qualification

Personnel Qualifications

Seed; G

Vegetation; G

Binders

SD-10 Operation and Maintenance Data

Maintenance Instructions

SD-11 Closeout Submittals

Maintenance Records

Final Project Report

1.4 QUALITY ASSURANCE

All Contractor and subcontractor personnel shall be fully qualified to perform the specified work and shall provide the Contracting Officer with

SECTION 31 32 39 Page 4 such documentation no less than 30 days before the notice to proceed.

Work shall not start until the Contracting Office is satisfied that the Contractor meets or exceeds all required qualifications. All Contractor records, documents, and work may be inspected by the Contracting Officer or designated representative at any time. Replace or repair immediately items not meeting quality requirements at no cost to the Government.

1.4.1 Regulatory Compliance

Perform the specified work in accordance with all applicable Federal, State, and local regulations.

1.4.2 Pre-Installation Conference

Coordinate and conduct meetings with the USACE and all subcontractors prior to the start of any work to ensure all work requirements are fully understood and will be performed. All of these meetings shall take place in the presence of the Contracting Officer.

1.4.3 Substitutions

Substitutions will not be allowed.

1.4.4 Qualifications

1.4.4.1 Installer's Qualification

Submit the installer's company name and address; training and experience and or certification. The installer shall be certified by the manufacturer for any special training and/or experience required for installation.

1.4.4.2 Personnel Qualifications

Submit a list of personnel working on the project including name, title, and statements of their current positions and previous experiences.

Selected personnel shall have been involved in bioengineering design and construction efforts similar to the proposed site work within the last 2 years.

1.5 DELIVERY, STORAGE, AND HANDLING

Submit a list of nonvegetative materials to be used in the construction of bioengineered feature or structure. Include manufacturer's literature regarding physical characteristics, limitations, and application or installation instructions. Store materials in designated areas as recommended by the manufacturer and that are protected from direct exposure to the elements, moisture, and any potential damage. Containers shall not be dropped from trucks. Material shall be free of defects that would void required performance or warranty. Deliver manufactured items in the manufacturer's original sealed containers and stored in a secure area.

Prior to delivery of materials, submit certificates of compliance attesting that materials meet the specified requirements. Certified copies of the material certificates shall include the following for items listed in this section:

a. Certification of recycled content or, SECTION 31 32 39 Page 5

b. Statement of recycled content.

c. Certification of origin including the name, address and telephone number of manufacturer.

d. Certification for binders showing EPA registered uses, toxicity levels, and application hazards.

1.5.1 Vegetation

Inspect vegetation cuttings, herbaceous plants, and clump plantings for species, size, health, and preparation. Reject diseased, improperly sized, and incorrect species. Specific requirements for storage and handling are provided below.

1.5.2 Earth Materials

Select fill, top soil, stone, rock, aggregate, and sand shall meet design specifications. Store excavated sediments and fill in well drained areas, separated from the ground by a non contaminating isolation barrier.

Material not meeting specifications or with contained physical or chemical contaminates shall be rejected.

1.6 PROJECT/SITE CONDITIONS

1.6.1 Existing Site Conditions

Submit a detailed description of the existing site conditions prior to construction work including but not limited to literary references, site visits, public or private reports, studies (engineering, ecological, environmental, etc.) and topographic or other maps. Submit two copies of this survey to the Contracting Officer 30 days before the start of work.

1.7 SEQUENCING AND SCHEDULING

Conduct all planting and seeding work during the period of plant dormancy, specifically, between November 1 and March 15 and in accordance with all Federal, State, and local requirements for in-stream or near stream construction. The construction sequence shall result in successful completion of the structure. Submit a construction work sequence schedule, detailing the work tasks and order of completion, to the Contracting Officer for approval a minimum of 30 days prior to the start of construction. Work shall not commence without the approval of the schedule and construction sequence by the Contracting Officer.

Construction shall not occur if climatic conditions threaten the survivability of plants or worker safety. Construction sequence schedule .

PART 2 PRODUCTS

2.1 BINDERS

Submit certification for binders showing EPA registered uses, toxicity levels, and application hazards. Prior to delivery of materials, submit certificates of compliance attesting that materials meet the specified requirements and certified copies of the material certificates. All binders shall be biodegradable and untreated hemp or coir rope or fasteners, which shall be able to withstand 2 years minimum exposure to the environment of placement without significant degradation in strength or quality. Steel or plastic binders or fasteners shall not be used.

SECTION 31 32 39 Page 6

2.2 TOPSOIL

Provide 4 inches of off-site topsoil at the surface of bioengineered area prior to seeding and planting to meet indicated finish grade. The upper layer of topsoil should not be compacted to allow growth of seeded grass and shrub/tree plantings. Remove debris and stones larger than 3/4 inch in any dimension remaining on the surface after finish grading. Correct irregularities in finish surfaces to eliminate depressions

2.3 EROSION CONTROL ITEMS

Provide erosion control products and sediment control structures or products. Install materials and structures according to manufacturer's recommendations based on actual site conditions and as shown in the drawings.

2.3.1 Erosion Control Blanket

Bioengineered soil areas shall be covered with a biodegradable, short-term, net straw fiber, erosion control blanket (S32 grade) designed to degrade within 12 months.

2.3.2 Coir Blankets

Alternatively, for segments of the soil fill designed at a 1.5H:1V slope, the areas shall be covered with a biodegradable, long-term, net coconut fiber, erosion control blanket (C32 grade) designed to degrade within 36 months.

2.4 SEED

Seed of the latest season's crop shall be provided in original sealed packages bearing the producer's guaranteed analysis for percentages of mixture, purity, germination, hard seed, weed seed content, and inert material. Labels shall be in conformance with AMS Seed Act and applicable State seed laws. Provide classification, botanical name, common name, percent pure live seed, minimum percent germination and hard seed, maximum percent weed seed content, and date tested. Submit the Seed Establishment Period calendar time for seed establishment. When there is more than one seed establishment period, describe the boundaries of the seeded area specific for each period. Temporary plantings shall be performed with annual ryegrass (Lotium multiflorum)at a density of 30 lbs./acre.

Temporary seeding shall occur within 48 hours after bioengineered areas have achieved final grading and shall be watered directly after seeding.

Permanent seed planting shall be performed with Roundstone, Mix 168, Southern Riparian Buffer shall be applied at 8 lbs/acre. Permanent seeding shall occur between 1 November and 15 March.

2.5 STAPLES

Do not use metal or plastic staples.

2.6 SYNTHETIC GRID AND SHEET SYSTEMS

Do not use synthetic grid and sheet systems.

SECTION 31 32 39 Page 7

2.7 CRUSHED ROCK, GRAVEL, SAND, STONE, RIPRAP, and BACKFILL

The quality of rock, gravel, sand, stone, riprap, and backfill shall be in accordance with requirements in Section 31 23 00.00 20 EXCAVATION AND FILL and Section 35 31 19 STONE PROTECTION. Materials not meeting specified requirements shall be rejected and immediately replaced by suitable material at no cost to the Government.

PART 3 EXECUTION

3.1 SITE VERIFICATION OF CONDITIONS

Coordinate, through the work schedule, the timing of land disturbing activities with the provision of erosion control measures. An erosion control plan will be required in accordance with applicable Federal, State, or local requirements. Perform erosion control operations under favorable weather conditions. When excessive moisture, frozen ground, or other unsatisfactory conditions prevail, stop the work as directed. When special conditions warrant a variance to earthwork operations, a revised construction schedule shall be submitted for approval. Bioengineering materials shall not be applied in adverse weather conditions, which could affect their performance. Complete all tasks necessary for the required submittals.

3.2 SITE PREPARATION

3.2.1 Temporary Construction Facilities

Identify any necessary access routes to the construction site prior to the start of work and show them on the drawings.

3.2.2 Erosion and Sediment Control

Install erosion and sediment control measures prior to active construction efforts to prevent erosion of soil and offsite releases of sediment.

3.3 FIRE PREVENTION

All efforts possible shall be taken to prevent fire at the work site and harvest area as a direct result of work efforts. Fire prevention or suppression equipment shall be provided to personnel at the work and harvest sites. All equipment shall be in compliance with applicable regulations and shall be kept in working condition at all times and within no more than 15 feet distant from the active work areas.

3.4 SANITATION

Provide adequate portable sanitation facilities for persons at the construction and harvest sites that are in compliance with all Federal, State, and local requirements.

3.5 TIME OF PLANTING

Temporary seeding and shrub/tree planting shall occur within 48 hours after bioengineered areas have achieved final grading. Permanent seeding shall occur between 1 November and 31 March.

SECTION 31 32 39 Page 8

3.6 BIOENGINEERED STRUCTURES

3.6.1 Common Structures

3.6.1.1 Permanent Seeding

Selected seed shall conform to all required regulations and requirements and all seeding shall be performed in accordance with Section 2.4 of this specification (31 32 19). Seed shall be placed before installation of erosion control mats or the application of other erosion control materials or products.

3.6.1.2 Shrub/Tree Planting

Spacing for the planting shall be in accordance with the Typical Planting section and schematic details provided in the Contract Drawings.

Shrub/tree plantings should consist of the following species: Black willow (Salix nigra), Witch hazel (Hamamelis virginica), Silky dogwood (Cornus amomum), Alnus serrulate (Smooth alder)

3.6.1.3 Live Fascine

3.6.1.3.1 Horizontal Fascines

Install all trenches parallel to the direction of the bank contours. All trenches shall be 18 inches wide and not more than 2 inches deeper than the diameter of the fascine bundles.

a. A key trench shall be excavated at the toe of the bioengineered soil fill, directly above top of the riprap at approximate elevation 641' feet above mean sea level, at the location shown on the drawings .

b. The fascine bundle shall be placed in the center of the trench with at least 2 inches of the bundle exposed above the top of the existing grade of the stream bank. The junction between the ends of adjacent fascine bundles in the same trench shall be offset side-by-side The fascine bundle shall be anchored in the trench with stakes that are at least 2 inches square at the top, 2.5 feet in length, and tapered from the top to the base. The stakes shall be driven vertically through the fascine until flush with the top of the bundle starting 1-foot from the end of each fascine and spaced every 4 feet thereafter. A terminal stake shall be driven one-foot from the end of the fascine regardless of spacing interval. Stakes shall not be driven through or within 6 inches of the binders. Live willow (Salix nigra) stakes shall be driven into the slope on the downhill side of the fascine bundle at an angle not to exceed 45 degree from vertical. The stakes shall be placed at the midpoint between the anchor stakes and shall contact the underside of the fascine, but shall not penetrate the fascine. At least3 inches of these downhill live stakes shall extend above the ground surface. Soil shall be placed and lightly tamped into place around the fascine and brushed into the voids in the fascine until only the top of the bundle is partially exposed. The top of the backfill shall slope towards the back of the fascine trench to prevent overtopping by runoff and to retain water and sediment.

3.7 FIELD QUALITY CONTROL

The work site shall be inspected by the Contracting Officer prior to final

SECTION 31 32 39 Page 9 acceptance of work. A punch list noting deficiencies shall be compiled by the Contracting Officer and provided to the Contractor. Perform, repair, adjust, align, or otherwise comply with the specified work on the punch list to the satisfaction of the Contracting Officer. Notify the Contracting Officer at least 14 days prior to the inspection that work shall be ready for inspection. Work will not be accepted until all punch list items are resolved and all work meets or exceeds contract requirements. Final acceptance of work shall not be provided by the Contracting Officer until all defects or deficiencies are corrected.

Final Acceptance shall occur only after all corrective actions and supplemental viable plantings are complete and the structure meets performance standards and all contract requirements.

3.8 CLEAN-UP

Excess material, debris, and waste materials shall be disposed of offsite at an approved landfill or recycling center. Adjacent paved areas shall be cleared. The site shall be restored to preexisting conditions to the extent reasonably possible and to the satisfaction of the Contracting Officer.

3.9 DOCUMENTATION

Establish and maintain documentation for bioengineering practices to record the desired information and to assure compliance with contract requirements, including, but not limited to, the following:

3.9.1 Final Project Report

The Final Project Report shall specify and summarize all construction activities and problems plus information included in the construction and maintenance records as submitted throughout the project. The report shall summarize the work rather than repeat the items in the individual reports.

SECTION 31 32 39 Page 10

2.2 SPLICES

1.7 SEQUENCING AND SCHEDULING