C.03.09-SPEC_AMND.pdf

The following modifications are made to the SCHEDULE OF PRICES, SECTION 01 11 00, SECTION 01 20 00 00, ATTACHEMENT A TO SECTION 01 33 00, and

SECTION 01 53 11.

SCHEDULE OF PRICES

a. ALL PAGES. Delete the Schedule of Prices in its entirety, and substitute therefor revised Schedule of Prices, AMEND 0001 dated 03 May 2024.

SECTION 01 11 00

b. ALL PAGES. Delete Section 01 11 00 in its entirety, and substitute therefor revised Section 01 11 00, AMEND 0001 dated 03 May 2024.

SECTION 01 20 00

c. PAGES 1, 2, AND 6. Delete Section 01 20 00 Pages 1, 2, and 6, and substitute therefor revised Section 01 20 00 Pages 1, 2, and 6, AMEND 0001 dated 03 May 2024.

ATTACHEMENT A TO SECTION 01 33 00

d. ALL PAGES. Delete Attachment A to Section 01 33 00 in its entirety, and substitute therefor revised Attachment A to Section 01 33 00, AMEND 0001 dated 03 May 2024.

SECTION 01 53 11

e. ALL PAGES. Delete Section 01 53 11 in its entirety, and substitute therefor revised Section 01 53 11, AMEND 0001 dated 03 May 2024.

ATTACHMENTS: Schedule of Prices; Section 01 11 00; Section 01 20 00

Pages 1, 2, and 6; Attachment A to Section 01 33 00, and

Section 01 53 11.

SOLICITATION NO.: W912DS24B0006

E3TRYLCK202201

SECTION TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

SECTION 01 11 00

SUMMARY OF WORK

PART 1 GENERAL

1.1 SUMMARY OF WORK

1.1.1 Base Bid

1.1.2 Option A

1.2 PROJECT LOCATION

PART 2 PRODUCTS

PART 3 EXECUTION

-- End of Section Table of Contents --

SECTION 01 11 00 Page 1 AMEND 0001

03 MAY 2024

SECTION 01 11 00

SUMMARY OF WORK

PART 1 GENERAL

1.1 SUMMARY OF WORK

1.1.1 Base Bid

The work includes, but is not limited to, placing and dewatering cofferdams, demolition, concrete work and underwater concrete, fabrications, painting, surveying, stoplogs, dive inspection and video inspection, and site restoration.

1.1.2 Option A

The work includes, but is not limited to, furnishing two cofferdams including all necessary design, submittals, fabrication, and transportation.

1.2 PROJECT LOCATION

The work is located at Hudson River, Troy, Rensselaer County, New York, and as indicated.

PART 2 PRODUCTS

Not Used

PART 3 EXECUTION

Not Used

-- End of Section --

SECTION 01 11 00 Page 2 AMEND 0001

03 MAY 2024

SECTION TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

SECTION 01 20 00

PRICE AND PAYMENT PROCEDURES

PART 1 GENERAL

1.1 JOB PAYMENT ITEMS

1.1.1 Mobilization and Demobilization

1.1.1.1 Payment

1.1.1.2 Unit of Measure

1.1.2 Survey

1.1.2.1 Payment

1.1.2.2 Unit of Measure

1.1.3 Diving

1.1.3.1 Payment

1.1.3.2 Unit of Measure

1.1.4 Cofferdam Work

1.1.4.1 Payment

1.1.4.2 Unit of Measure

1.1.5 Electrical Work

1.1.5.1 Payment

1.1.5.2 Unit of Measure

1.1.6 Recess Work

1.1.6.1 Payment

1.1.6.2 Unit of Measure

1.1.7 Protection Plate Fabrication

1.1.7.1 Payment

1.1.7.2 Unit of Measure

1.1.8 Lifting Beam Guide Block Installation

1.1.8.1 Payment

1.1.8.2 Unit of Measure

1.1.9 Stoplog Work

1.1.9.1 Payment

1.1.9.2 Unit of Measure

1.1.10 Trash Rack Work

1.1.10.1 Payment

1.1.10.2 Unit of Measure

1.1.11 Handrailing Replacement

1.1.11.1 Payment

1.1.11.2 Unit of Measure

1.1.12 Site Restoration

1.1.12.1 Payment

1.1.12.2 Unit of Measure

1.1.13 Furnish Cofferdams

1.1.13.1 Payment

1.1.13.2 Unit of Measure

1.2 UNIT PRICE PAYMENT ITEMS

1.2.1 Temporary Construction Facilities

1.2.1.1 Payment

1.2.1.2 Measurement

1.2.1.3 Unit of Measure

1.2.2 Stoplog Recess Concrete Removal

SECTION 01 20 00 Page 1 AMEND 0001

03 MAY 2024

1.2.2.1 Payment

1.2.2.2 Measurement

1.2.2.3 Unit of Measure

1.2.3 Stoplog Recess Concrete Placement

1.2.3.1 Payment

1.2.3.2 Measurement

1.2.3.3 Unit of Measure

PART 2 PRODUCTS

PART 3 EXECUTION

-- End of Section Table of Contents --

SECTION 01 20 00 Page 2 AMEND 0001

03 MAY 2024

1.1.10 Trash Rack Work

1.1.10.1 Payment

Payment for all costs associated with upstream trash racks, support beams, and embedded metals, including, but not limited to, concrete removal including embedded metals, concrete placement, fabricating trash rack grating, painting, installing support beams, and installing trash racks will be made for Item No. 0013, "Trash Rack Work."

1.1.10.2 Unit of Measure

Unit of measure: job.

1.1.11 Handrailing Replacement

1.1.11.1 Payment

Payment for all costs associated with handrailing, fabricating, packaging, delivering, and incidentals, including painting, will be made for Item No.

0014, "Handrailing Replacement."

1.1.11.2 Unit of Measure

Unit of measure: job.

1.1.12 Site Restoration

1.1.12.1 Payment

Payment for all costs associated with restoring the site and staging areas to original or better condition includes, but is not limited to, seeding and debris removal will be made for Item No. 0015, Site Restoration."

1.1.12.2 Unit of Measure

Unit of measure: job.

1.1.13 Furnish Cofferdams

1.1.13.1 Payment

Payment for all costs associated with furnishing two cofferdams, including but not limited to, design, fabrication, submittals, transport to and from site, and rental fees (if applicable) will be made for Item No. 101, Option A - Furnish Cofferdams."

1.1.13.2 Unit of Measure

Unit of measure: job.

1.2 UNIT PRICE PAYMENT ITEMS

Payment items for unit price payments will be made in the SCHEDULE OF PRICES and as specified. The unit price and payment made for each item will constitute full compensation for furnishing all plant, labor, materials, and equipment, and performing any associated quality control, environmental protection, meeting safety requirements, tests and reports, and for performing all work required for each unit price item.

SECTION 01 20 00 Page 6 AMEND 0001

03 MAY 2024

SUBMITTAL FORM,Jan 96 PREVIOUS EDITION IS OBSOLETE PAGE 1 OF 9 PAGES

Troy Lock, Troy, NY, Stoplog Recess and Trash Rack Replacement

00 73 05 SD-01 Preconstruction Submittals

1.6.1 G SLBackground Checks

1.6.2 G SLCompany Enrollment in E-Verify

1.6.2 G SLForm I-9

1.9 G CTInsurance

GPermits

1.12 GPre-Construction Condition

Survey

1.25 GHigh Water Action Plan

1.29 GECDLVideo Inspection Plan

SD-11 Closeout Submittals

1.12 GPost-Construction Condition

Survey

01 14 00 SD-01 Preconstruction Submittals

1.8.1 GFloating Plant Plan

1.4.1 GPre-Closure Work Plan

SD-05 Design Data

1.7.1 GECDSEquipment Placement Plan

1.7.2 GECDSLock Wall Stability Analysis

01 32 16 SD-01 Preconstruction Submittals

1.2 GConstruction Schedule

SD-07 Certificates

1.4Monthly Updates

01 35 26 SD-01 Preconstruction Submittals

1.6 G SOAccident Prevention Plan (APP)

1.7 G SOActivity Hazard Analysis (AHA)

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SUBMITTAL FORM,Jan 96 PREVIOUS EDITION IS OBSOLETE PAGE 2 OF 9 PAGES

01 35 26 1.6 G SOCrystalline Silica Plan

1.6 G SOCrane Critical Lift Plan

1.4.1.4 G SOCrane Operators

1.13 GDiving Plan

SD-06 Test Reports

1.10Accident Reports

1.10Crane Reports

SD-07 Certificates

1.11 G SOHot Work Permit

1.10 G SOCertificate of Compliance

1.9First Aid and CPR

1.6 G SOBoat Operator

01 45 00 SD-01 Preconstruction Submittals

1.7.2.1 GPay Activity Data

01 45 04 SD-01 Preconstruction Submittals

3.2 GContractor Quality Control (CQC)

Plan

01 50 00 SD-02 Shop Drawings

1.3 G ECCSign Legend Orders

1.3 GConstruction Project Signs

01 50 02 SD-01 Preconstruction Submittals

1.2 GSite Plan

01 53 11 SD-01 Preconstruction Submittals

3.7 GECDLCofferdam Installation and

Dewatering Plan

2.2.2 GECDLCofferdams

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SUBMITTAL FORM,Jan 96 PREVIOUS EDITION IS OBSOLETE PAGE 3 OF 9 PAGES

01 57 19 SD-01 Preconstruction Submittals

1.6 GECDNEnvironmental Protection Plan

3.9Hazardous Material Management

SD-06 Test Reports

1.8Solid Waste Management Report

GECDNLaboratory Analysis

SD-11 Closeout Submittals

3.8.3.4 GECDNDisposal Documentation for

Hazardous and Regulated Waste

01 78 00 SD-11 Closeout Submittals

1.2.1 GAs-Built Drawings

02 21 00 SD-01 Preconstruction Submittals

1.6 GECDLWork Plan and Schedule

3.4 GECDLPreliminary Survey

1.5 GECDLProfessional Registration

3.6 GECTSPosition Monument Survey

SD-11 Closeout Submittals

3.5 GECTSFinal Survey

02 41 00 SD-01 Preconstruction Submittals

1.7 GNotifications

1.10 GDemolition And Deconstruction

Plan

03 01 10 SD-01 Preconstruction Submittals

3.1 G ECGIRemoval Plan

3.7 GQuality Control Plan

03 01 20 SD-01 Preconstruction Submittals

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SUBMITTAL FORM,Jan 96 PREVIOUS EDITION IS OBSOLETE PAGE 4 OF 9 PAGES

03 01 20 Part 2 GECDLEquipment

1.4 GECDLWork Plan

SD-07 Certificates

3.1 GExperience

03 11 19 SD-01 Preconstruction Submittals

1.3.1 G ECGFormwork Calculations

SD-02 Shop Drawings

1.3.2 GECDLShop Drawings

SD-03 Product Data

2.1 GECDLFormwork Materials

2.1.1 GECDSPlywood

2.2.2 GECDLConcrete Form Hardboard

2.2.1 GECDLPrefabricated Steel Forms

2.3 GECDLForm Coating

SD-06 Test Reports

G ECGConcrete Strength - Control Tests

03 15 14 SD-01 Preconstruction Submittals

1.3 G ECGIJointing Plan

SD-03 Product Data

2.2 G ECGIBacker Rod

2.3 G ECGISealants

2.1 G ECGIExpansion/Isolation Joint Filler, Premolded

03 20 01 SD-02 Shop Drawings

3.1 GECDLReinforcement

SD-03 Product Data

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SUBMITTAL FORM,Jan 96 PREVIOUS EDITION IS OBSOLETE PAGE 5 OF 9 PAGES

03 20 01 2.1.1 GECDLReinforcing Steel

03 31 00 SD-01 Preconstruction Submittals

1.8 G ECGIAggregate Source

3.8.6 G ECGICold-Weather Placing

3.8.7 G ECGIHot-Weather Placing

3.2 G ECGIBatching and Mixing Equipment

3.5 G ECGIPlacing Equipment and Methods

3.7.3 G ECGIConstruction Joint Treatment

SD-02 Shop Drawings

3.8.1 G ECGIConcrete Placement Plan

SD-03 Product Data

2.1.8 G ECGINonshrink Grout for Concrete

Repairs

2.1.4 G ECGICuring and Protection Materials

SD-05 Design Data

2.1.7 G ECGIEpoxy Resin

1.6 G ECGIConcrete Mixture Proportions

1.9 G ECGIThermal Control Plan

3.11.2.1 G ECGIRandom Sampling Plan

SD-06 Test Reports

G ECGIAggregate Test Results

3.11 G ECGITests and Inspections

3.8.8 G ECGITemperature Monitoring

2.2.3 G ECGIPotential Alkali-Silica Reactivity

SD-07 Certificates

G ECGIWaybills and Delivery Tickets

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03 31 00 G ECGIConcrete Finish Qualifications

G ECGIConcrete Inspector Qualifications

3.11.1 G ECGISample and Test Concrete

05 05 20 SD-01 Preconstruction Submittals

1.4.1 GInstaller Qualifications

1.4.2 GPost-Installed Anchor Special

Inspector Qualifications

GTest Setup Sketches and

Specifications for Proof Loads

3.5 GEpoxy Anchor Quality Control

Procedure

SD-02 Shop Drawings

3.4.2 GECDLTesting Apparatus

SD-03 Product Data

2.1.5 GECDLAdhesive Anchor System in

Concrete

3.1.2 GECDLNon-Shrink, Non Metallic Grout

SD-06 Test Reports

3.4.5 GPost-Installed Anchor Special

Inspections Report

SD-07 Certificates

2.1.3 GPost-Installed Anchor

Certification

SD-08 Manufacturer’s Instructions

2.1.4 GManufacturer's Printed

Installation Instructions

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SUBMITTAL FORM,Jan 96 PREVIOUS EDITION IS OBSOLETE PAGE 7 OF 9 PAGES

05 05 20 1.4Manufacturer's Safety Data

Sheets

05 05 23 SD-01 Preconstruction Submittals

3.2 GECDLWelding Quality Assurance Plan

1.3 GECDLWelding Procedure Qualifications

1.3.3 GECDLWelder, Welding Operator, and

Tacker Qualification

1.3.2 GECDLPre-Qualified Procedures

SD-03 Product Data

2.2 GECDLWelding Electrodes and Rods

SD-06 Test Reports

1.3.1 GECDLPrevious Qualifications

3.3 GECDLNondestructive Testing

3.2 GECDLWeld Inspection Log

SD-07 Certificates

GECDLCertified Welding Procedure

Specifications (WPS)

GECDLCertified Procedure Qualification

Records (PQR)

GECDLCertified Welder Performance

Qualifications (WPQ)

1.3.4 GECDLCertified Welding Inspector

1.3.4 GECDLNondestructive Testing Personnel

05 50 14 SD-02 Shop Drawings

1.4.1 GECDLDetail Drawings

SD-06 Test Reports

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05 50 14 Materials Certifications

09 97 02 SD-01 Preconstruction Submittals

1.3.1.1 GECDLPreparation and Painting

Management Program

1.3.2Equipment List

SD-04 Samples

2.1 GECDLSpecial Paint Formulas

2.3.3 GECDLSolvent and Thinners

SD-07 Certificates

1.3.1 GECDLQualified Paint Applicator

GECDLQuality Control Inspector

Qualification

GECDLShop Qualification

1.3.2 GECDLCoating Thickness Gage

Qualification

32 92 10 SD-07 Certificates

2.1 GSeed

2.1 GFertilizer

2.1 GMulch

33 71 02 SD-02 Shop Drawings

3.1 GECDGTemporary Power Plan

3.2.1 GECDGEmbedded Ducts Marking Photos

SD-03 Product Data

2.1 GECDGUninterruptible Power Supply

(UPS)

SD-06 Test Reports

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SUBMITTAL FORM,Jan 96 PREVIOUS EDITION IS OBSOLETE PAGE 9 OF 9 PAGES

33 71 02 3.2.2.2 GECDGPreconstruction Electrical Test

Report

3.2.2.2 GECDGElectric Cable Continuity And

Megger Tests Report

3.2.2 GECDGAcceptance Checks and Tests

SD-07 Certificates

1.3.1 GTechnician Certification

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ATTACHMENT A TO SECTION 01 33 00

SECTION TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

SECTION 01 53 11

PROTECTION, DEWATERING, AND DEBRIS REMOVAL

PART 1 GENERAL

1.1 SUBMITTALS

1.2 HISTORY OF LOCK CHAMBER DEWATERINGS

PART 2 PRODUCTS

2.1 GOVERNMENT FURNISHED DEWATERING STRUCTURES

2.1.1 Lock Chamber Stoplogs

2.1.2 Cofferdams (Option A Not Awarded)

2.2 CONTRACTOR-FURNISHED DEWATERING ITEMS

2.2.1 Stair Towers

2.2.2 Cofferdams (Option A Awarded)

PART 3 EXECUTION

3.1 DEWATERING COORDINATION MEETING

3.2 STOPLOG RECESS PROTECTION PLATE ASSEMBLIES REMOVE/REINSTALL

3.3 WALKWAYS ACROSS STOPLOGS

3.4 LOCK CHAMBER MONITORING DURING DEWATERING

3.4.1 Contracting Officer Monitoring

3.4.2 Contractor Monitoring

3.5 REMOVAL OF MATERIAL FROM AREAS TO BE DEWATERED

3.6 EMERGENCY REWATERING OF LOCK CHAMBER

3.7 COFFERDAM INSTALLATION AND DEWATERING PLAN

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SECTION 01 53 11

PROTECTION, DEWATERING, AND DEBRIS REMOVAL

PART 1 GENERAL

1.1 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Cofferdam Installation and Dewatering Plan; G ECDL

Cofferdams; G ECDL

Submit detailed drawings, calculations, and other pertinent data related to the design and construction of dewatering structures.

Only required if option A is awarded.

1.2 HISTORY OF LOCK CHAMBER DEWATERINGS

Troy Lock is regularly dewatered during winter for maintenance purposes.

There is no information on the requirements to dewater and maintain the lock chamber, however, the multiple previous lock dewaterings suggests that there are no seepage or scour issues present.

PART 2 PRODUCTS

2.1 GOVERNMENT FURNISHED DEWATERING STRUCTURES

2.1.1 Lock Chamber Stoplogs

Stoplogs for the downstream stoplogs recess will be Government furnished.

The downstream dewatering structure to consist of several stoplog sections, stacked on top of one another. There are 21 stoplogs which, when stacked, form the downstream stoplogs Each stop log weighs approximately 6,500 lbs and dimensions of 48.5'L x 2.75'W x 33"H. A joint inspection of the stoplog sections will be performed and documented by the Contractor and Contracting Officer to ascertain their condition prior to use by the Contractor.

Additionally, a single pickup beam for the stoplogs will be Government furnished. The pickup beam weighs approximately 3,200 lbs.

The stoplogs are stored at Troy Lock. Install and maintain the stoplogs during the first closure until downstream stoplog recesses are complete, stoplogs have been installed and inspected, and lock has been dewatered;

after which the Contractor leaves the stoplogs in place in the stoplog recess and turns over site control to the Government. The Government will perform all stoplog operations during second closure.

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2.1.2 Cofferdams (Option A Not Awarded)

Two cofferdams will be provided by the Government for Contractor use if option A is not awarded. Install and maintain cofferdams during stoplog slot replacement. A joint inspection of the cofferdams will be performed and documented by the Contractor and Contracting Officer to ascertain their condition prior to use by the Contractor. At the time of return, a second joint inspection will be performed to determine the returned condition. Reinstall bottom plate on second cofferdam after use and before the second joint inspection. Any damage incurred due to Contractor operations will be required at the Contractor's expense. The cofferdams are not designed to handle ice loading. Provide bubblers or other means to prevent ice buildup on cofferdams.

2.2 CONTRACTOR-FURNISHED DEWATERING ITEMS

2.2.1 Stair Towers

Provide stair towers in accordance with USACE EM 385-1-1. Include description and quantity of stair towers in the Confined Space Entry Plan in accordance with Section 01 35 26 GOVERNMENTAL SAFETY REQUIREMENTS.

Stair towers are required for second dewatering only.

2.2.2 Cofferdams (Option A Awarded)

If option A is awarded, then furnish two (2) cofferdams in accordance with USACE technical manuals, safety manuals, and applicable design codes such as AISC and AWS D1.1/D1.1M . Submit the plan and detailed design of the dewatering structures, including possible walkways and handrails, as applicable, for approval a minimum of 45 days prior to start of construction of items. Perform proposed dewatering structure designs by a licensed Professional Structural Engineer with experience in designing dewatering structures and indicate on the submitted design with the Structural Engineer's signed stamp. The cofferdam design must consider the following minimum requirements:

a. Design for water when the top of the structure is in a dewatered state, to provide the maximum hydraulic force on the structure.

Cofferdam height extensions are prohibited unless specifically included in the design.

b. Include a 5 kip per lineal foot ice load acting in a location to provide maximum stress.

c. Include impact loads from falling debris and external forces such as floating debris.

d. Include consideration for uplift forces on the cofferdam.

e. Include considerations for securing the cofferdam to the existing structure, noting the existing concrete at the site was not air-entrained and constructed over 75 years ago, and condition of the concrete is unknown and may include cracking, spalling, and other forms of deterioration.

f. Include considerations for sealing of cofferdam on surfaces that are cracked, spalled, or have other forms of deterioration.

Design dewatering structures to fit the areas for work performed in the

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dry.

PART 3 EXECUTION

3.1 DEWATERING COORDINATION MEETING

Hold a preliminary meeting with Contracting Officer personnel directly involved with the dewatering effort approximately seven calendar days in advance of beginning dewatering operations at the site, for coordination with the Contractor on schedule, sequence, fleet management, and other issues directly related to the dewatering of the lock chamber.

3.2 STOPLOG RECESS PROTECTION PLATE ASSEMBLIES REMOVE/REINSTALL

There are wooden and steel protection plate assemblies within each of the two stoplog recesses which require removal to accommodate placement of stoplogs in the recesses.

3.3 WALKWAYS ACROSS STOPLOGS

If necessary, provide walkway across the downstream stoplogs to allow personnel access from the land wall to the river wall. Walkways used for personnel access only, and equipment or materials are not allowed across the walkways. Design walkways in accordance with USACE EM 385-1-1. The walkways may not be attached to the stoplogs by permanent methods (i.e., drilling holes thru stoplogs or welding to stoplogs). Design the downstream stoplog walkway for quick removal in case of necessity for emergency rewatering. Inspect walkways throughout use, and maintain or repair walkways in accordance as specified, indicated, and by EM 385-1-1.

3.4 LOCK CHAMBER MONITORING DURING DEWATERING

3.4.1 Contracting Officer Monitoring

During lock drawdown for dewatering, Contracting Officer will monitor the floor of the lock for boils or unusual wall movement. If floor slab heaving or any structural distress due to uplift pressures are detected, the Contracting Officer will immediately work with the Contractor to evacuate the chamber and the Government will rewater the lock chamber.

During the dewatering, the Contracting Officer will be monitoring the observation wells installed on an hourly basis during the lock dewatering drawdown, and then daily thereafter for the entire dewatering period.

Maintain access to the observation wells, as well as a 5-foot x 5-foot area around the well for Contracting Officer use. The Contracting Officer may place physical continuous monitoring devices during the dewatering at the observation wells which will take up the entire 5-foot x 5-foot area.

Plan construction activities to avoid disturbance or damage to equipment.

3.4.2 Contractor Monitoring

After completion of the dewatering, the Contractor and Contracting Officer to monitor the floor of the lock for boils or unusual wall movement. If floor slab heaving or any structural distress due to uplift pressures are detected, immediately evacuate the chamber. The Government will rapidly fill the chamber with water.

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3.5 REMOVAL OF MATERIAL FROM AREAS TO BE DEWATERED

Remove all debris and materials in the lock chamber in the areas to be used for cofferdam placement and dewatering prior to underwater concrete placement. All debris and material is to be disposed off-site. Items that may be found include, but are not limited to, rocks, organic materials such as trees, silt, and man-made items such as wire rope, chain binders, recreational boating item, and any other items considered debris. If any hazardous materials, debris, or waste are encountered, work must immediately cease and the Contracting Officer notified. Refer to Section 01 57 19 TEMPORARY ENVIRONMENTAL CONTROLS, for removal/disposal of found hazardous materials, debris, or waste.

Remove zebra mussels from all equipment, existing structures, and dewatered floor areas prior to re-entry of water. Properly dispose to a landfill area in a manner that will not allow the mussels to re-enter the water.

3.6 EMERGENCY REWATERING OF LOCK CHAMBER

In the event of structural instability of the lock chamber during dewatering, or other conditions where the integrity of the structure is in jeopardy, the Government will rapidly fill chamber to alleviate the distress by removing the downstream lock chamber bulkheads. Remove all equipment and materials, including any walkway structures located on the bulkheads, within 30 minutes of notice by the Contracting Officer.

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3.7 COFFERDAM INSTALLATION AND DEWATERING PLAN

Submit a comprehensive plan detailing the work items to be completed, the proposed time for accomplishing work, the method proposed to install the dewatering structures with approved anchors, the method proposed to dewater the areas in which work is to be performed in the dry, the method proposed to seal leakage around or through the dewatering structures, through cracks/joints in the concrete which may leak and where existing structures have concrete spalling in the areas of the cofferdam seals, and the method to keep ice away from the cofferdams. Submit the dewatering plan a minimum 45 days prior to the closure period. Submit the seals that will be used on the cofferdams. Modifications of the cofferdams is prohibited if Government supplied.

a. In addition to installing the cofferdams, provide, operate, and maintain all pumps and other equipment necessary to maintain the cofferdams, in the dry, in dewatered condition.

b. Submit dewatering layouts plans as part of the cofferdam dewatering plan and revised in accordance with site conditions. Dewatering designs and the capacity of equipment in accordance with sound engineering practice. Hydraulically driven pumps are prohibited for dewatering.

c. Contractor will be present at all times during cofferdam dewatering and rewatering of the areas in which work is to be performed in the dry. During the time the work areas are dewatered and when a Contractor representative is not on the job site during Contractor working hours, the Contractor will ensure that a Contractor representative can be contacted via telephone at all times by Contracting Officer personnel. If requested by the Contracting Officer, the Contractor representative will be able to be present on the project site within 1/2 hour after the request is made.

d. During and after completion of cofferdam dewatering, monitor the dewatering structures for instability or unusual movement on a daily basis, prior to entering the cofferdam. Monitoring consists of, but not limited to, visually inspecting the cofferdam for changes in leakage amounts, movement of the structure, and impact damage. The Contracting Officer will provide oversight on the Contractor's evaluation and monitor the dewatering structure with emphasis on worker protection and dam structure integrity. If any structural distress is detected, the dewatering structure will be immediately evacuated and the Contractor to immediately notify the Contracting Officer.

e. Address provisions to control leakage around the cofferdam and through joints in the existing concrete structure.

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