35_20_23.pdf

Jacksonville Harbor Maintenance Dredging, 40-Foot Project, Bar Cut-3 Thru Cut-9, Duval County,Florida

SECTION TABLE OF CONTENTS

DIVISION 35 - WATERWAY AND MARINE CONSTRUCTION

SECTION 35 20 23

DREDGING

PART 1 GENERAL

1.1 SCOPE

1.2 REFERENCES

1.3 SUBMITTALS

1.4 DREDGING RESTRICTIONS

1.4.1 Order of Work

1.4.2 Transportation of Material

1.5 SPECIAL INSTRUCTIONS

1.6 PUMPING OF BILGES

1.7 HISTORICAL PERIOD SHIPWRECK SITES

1.8 UTILITY CROSSINGS

1.8.1 General

1.9 PERMITS

1.10 FUEL OIL TRANSFER OPERATIONS

1.10.1 Fueling Dredges and Auxiliary Vessels

1.10.2 Fueling Land-Based Equipment on Buck Island DMMA Site

1.11 SIGNAL LIGHTS

1.12 NOTICE TO MARINERS -- DREDGING CONTRACTS

1.13 FINAL CLEANUP

1.14 WORK VIOLATIONS

1.15 NATIONAL DREDGING QUALITY MANAGEMENT PROGRAM SYSTEM (HOPPER

DREDGES AND DUMP SCOWS)

1.15.1 System Requirements

PART 2 PRODUCTS (NOT APPLICABLE)

PART 3 EXECUTION

3.1 NOTIFICATION OF COAST GUARD

3.1.1 Navigation Aids

3.1.2 Dredging Aids

3.2 WORK AREA

3.2.1 Access

3.2.2 Protection of Existing Waterways

3.2.3 Adjacent Property and Structures

3.2.4 Subaqueous Cable Crossings

3.3 DISPOSAL OF EXCAVATED MATERIAL

3.3.1 General

3.3.2 Upland Disposal Area

3.3.2.1 Mobilization/Demobilization to the Buck Island DMMA

3.3.2.2 Location of Discharge Line

3.3.2.3 Concurrent Offloading Operations by Others

3.3.2.4 Maximum Height of Dredged Materials

3.3.2.5 Disposal Area Drainage

SECTION 35 20 23 Page 1 GROUP4-10-R-J033 Revision 0003

3.3.2.6 Preservation and Restoration of Landscape and Marine

Vegetation Damages

3.3.2.7 Weir Operations

3.3.2.7.1 Maximum Ponding Depth

3.3.2.7.2 Weir Boards

3.3.2.7.3 Lighting

3.3.2.7.4 Night-Time Visual Monitoring

3.3.2.7.5 Decanting

3.3.2.7.6 Water Surface Elevation

3.3.3 Barges

3.3.4 Placing of Dredged Material

3.3.5 Dredge Pipelines

3.3.5.1 Dredge Discharge Pipeline

3.3.5.2 Submerged Pipeline

3.3.5.3 Floating Pipeline

3.3.6 Booster Pumps

3.4 REQUIRED DEPTH, ALLOWABLE OVERDEPTH, AND SIDE SLOPES

3.4.1 Required Depth

3.4.2 Allowable Overdepth

3.4.3 Side Slopes

3.4.4 Excessive Dredging

3.4.5 Areas to be Dredged

3.4.6 Acceptance Sections

3.5 SURVEYS

3.5.1 General

3.5.2 Contractor Representative

3.5.3 Survey Certification

3.5.4 Tide Data

3.5.4.1 Real Time Kinematic (RTK) GPS

3.5.4.2 Kinematic Tidal Datum

3.6 INSPECTION

3.6.1 Quality Assurance Representative (QAR)

3.6.2 Failure to Comply

3.7 FINAL EXAMINATION AND ACCEPTANCE

3.7.1 Final Examination of Work

3.7.2 Bed Leveling

3.7.3 Bed Leveling - Reporting and Documenting

3.7.4 Final Acceptance

3.8 SHOALING

3.9 CONTINUITY OF WORK

3.10 NOISE CONTROL

3.11 DREDGE CERTIFICATION

3.12 GENERAL DREDGING SAFETY REQUIREMENTS

3.12.1 Dredge Plant Restriction Definitions

3.12.1.1 Certification Required Line - Coast Guard Inspected

(CRL-C)

3.12.1.2 Certification Required Line - Load Line (CRL-L)

3.12.1.3 Certification Required Line - Hopper (CRL-H)

3.12.2 Certification of Attendant and Auxiliary Plant

3.12.3 Minimum Tow-Boat Requirements

3.12.4 Harbor Specific Dredging Restrictions

3.12.4.1 Jacksonville Harbor

3.13 CONSTRUCTION FORMS AND DETAILS

-- End of Section Table of Contents --

SECTION 35 20 23 Page 2

SECTION 35 20 23

DREDGING

PART 1 GENERAL

1.1 SCOPE

The work covered by this section consists of furnishing all labor, materials, and equipment, and performing all excavation and disposal of all material as specified herein or indicated on the drawings. This scope also includes all necessary measures for protection of the environment.

Environmental protection requirements under this contract are as important to overall completion of the work as other technical aspects. Failure to meet the requirements of these specifications for environmental protection may result in work stoppages or termination for default. No part of the time lost due to any such work stoppages shall be made the subject of claims for extensions of time or for excess costs or damages by the Contractor. If the Contractor fails or refuses to promptly repair any damage caused by violation of the provisions of these specifications, the Contracting Officer may have the necessary work performed and charge the cost thereof to the Contractor.

1.2 REFERENCES

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

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 385-1-1 Safety and Health Requirements Manual

EM 1110-1-1000 (1993) Photogrammetric Mapping

EM 1110-1-1002 (1990) Survey Markers and Monumentation

EM 1110-1-1003 (1996) NAVSTAR Global Positioning System Surveying

EM 1110-1-1004 (1994) Deformation Monitoring and Control Surveying

EM 1110-1-2909 (1998; Chg 2) Geospatial Data and Systems

EM 1110-2-1003 (2002) Hydrographic Surveying

FLORIDA BOARD OF PROFESSIONAL SURVEYORS AND MAPPERS (FBPSM)

FBPSM Minimum Technical Standards, Chapters 177, 472, 61G17

TRI-SERVICE STANDARDS (TSS)

TSS (2006) A/E/C CADD Standards

SECTION 35 20 23 Page 3

1.3 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. The following shall be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Notice of Intent to Dredge

Prior to commencement of work on this contract, the Contractor shall notify the Commander, Seventh Coast Guard District of his intended operations to dredge and request that it be published in the Local Notice to Mariners. This notification must be given in sufficient time so that it appears in the Notice to Mariners at least two weeks prior to the commencement of this dredging operation. A copy of the notification shall be provided to the Contracting Officer.

Relocation of Navigation Aids

The Contractor shall not remove, change the location of, obstruct, willfully damage, make fast to, or interfere with any aid to navigation. Within 7 calendar days following receipt of Notice of Award, the Contractor shall notify the Commander, Seventh Coast Guard District, Miami, Florida, of his plan to dredge adjacent to any aids which require relocation to facilitate dredging. The notification shall be sent via Fax to 305-415-6757, ATTN: Mr. Gene Stratten. This notification shall be immediately followed by a formal written request with a copy to the Contracting Officer. The Contractor shall also contact the U.S.

Coast Guard, 305-415-6750, for information concerning the position to which the aids will be relocated.

SD-02 Shop Drawings

Drag Bar

Submit drawings and one photograph showing drag bar equipment used for final leveling work indicated in the paragraph FINAL EXAMINATION AND ACCEPTANCE below.

SD-07 Certificates

Historical Period Shipwreck Sites

The Contractor shall immediately notify the Contracting Officer if any shipwreck, artifact, or other objects of antiquity that have scientific or historical value, or are of interest to the public, are discovered, located, and/or recovered.

Acceptance Sections ; G, DO Plan

Submit an acceptance sections plan for approval by the Government prior to commencement of work. See subparagraph "Acceptance Sections" in paragraph REQUIRED DEPTH, ALLOWABLE

SECTION 35 20 23 Page 4

OVERDEPTH, AND SIDE SLOPES below.

Surveys

The Contractor shall give 10 days advance notice, in writing, to the Contracting Officer of the need for a pre-dredging survey or after-dredging survey for final acceptance for each acceptance section.

Daily/Monthly Report of Operations

The Contractor shall prepare on QCS and submit one (1) hard copy of the Daily Report of Operations, using either ENG Form No. 27A or ENG Form No. 4267, for each dredge and/or unloader working.

This report shall be submitted on a daily basis and not in groups (groups = multi-days reports packaged together at one time). In addition to the daily report, the Contractor shall prepare a Monthly Report of Operations for each month or partial month's work on either ENG Form No. 27A or ENG Form No. 4267. The monthly report shall be submitted on or before the 7th of each month, consolidating the previous month's work. Upon completion of the job, the Contractor shall submit a consolidated job report, combining the monthly reports. The Contractor shall distribute one copy of each report to the District Engineer; ATTN:

CESAJ-EN-C; U.S. Army Engineer District, Jacksonville, P.O. Box 4970; Jacksonville, Florida 32232-0019. Reports shall be submitted on a monthly basis with daily reports accompanying the monthly report and job report.

Additionally, one copy of the form(s) shall be maintained by the Contractor on the dredge(s) for the Contracting Officer's inspection purpose. Further instructions on the preparation of the reports will be furnished at the Preconstruction Conference.

Misplaced Material

The Contractor shall notify the U.S. Coast Guard Marine Safety Office of any misplaced material as stated in the Clause OBSTRUCTION OF NAVIGABLE WATERWAYS of Section 00700 CONTRACT CLAUSES in Volume 1.

Declaration of Inspection

Refer to paragraph FUEL OIL TRANSFER OPERATIONS below for submittal.

1.4 DREDGING RESTRICTIONS

1.4.1 Order of Work

There is no specific order of work for this project. The dredging performed by all dredges shall be continuous within reaches approved by the Contracting Officer.

1.4.2 Transportation of Material

Water and dredge material shall not be permitted to overflow or spill out of barges or hopper dredges during transport to the disposal site.

SECTION 35 20 23 Page 5

1.5 SPECIAL INSTRUCTIONS

Dredging of insitu rock is not required; but if encountered, the location and extent of any insitu rock above grade or required depth shall be reported to the Contracting Officer.

1.6 PUMPING OF BILGES

Contractors are warned that pumping oil or bilge water containing oil into navigable waters, or into areas which would permit the oil to flow into such waters, is prohibited by Section 13 of the River and Harbor Act of 1899, approved 3 March 1899 (30 Stat. 1152; 33 U.S.C. 407). Violation of this prohibition is subject to the penalties under the referenced Acts.

1.7 HISTORICAL PERIOD SHIPWRECK SITES

If any shipwreck, artifact, or other objects of antiquity that have scientific or historical value, or are of interest to the public, are discovered, located, and/or recovered, the Contractor acknowledges that:

a. The site(s), articles, or other materials are the property of the State of Florida, with title vested in the Department of State, Division of Historical Resource; and that,

b. He will immediately notify the Contracting Officer.

1.8 UTILITY CROSSINGS

1.8.1 General

It is the Contractor's responsibility to investigate the location of all utility crossings. The Contractor shall take precautions against damages which might result from his operations in the vicinity of the utility crossings. If any damage occurs as a result of his operations, the Contractor will be required to suspend dredging until the damage is repaired and approved by the Contracting Officer. Costs of such repairs and downtime of the dredge and attendant plant shall be at the Contractor's expense.

1.9 PERMITS

The Contractor's attention is directed to the Clause PERMITS AND RESPONSIBILITIES of Section 00700 CONTRACT CLAUSES in Volume 1 and the paragraph PERMITS AND AUTHORIZATIONS of Section 01 57 20 ENVIRONMENTAL

PROTECTION.

1.10 FUEL OIL TRANSFER OPERATIONS

1.10.1 Fueling Dredges and Auxiliary Vessels

In accordance with U.S. Coast Guard regulations (33 CFR 156.120), couplings used in fuel oil transfer operations on any vessel with a capacity of 250 or more barrels of oil shall be either a bolted or full-threaded connection; or a quick-connect coupling approved by the Commandant; or an automatic back-pressure shutoff nozzle used to fuel the vessel. An executed fuel oil transfer (Declaration) form signed by the tanker operator shall be submitted to the Contracting Officer for each refueling operation. The U.S. Coast Guard shall also be notified prior to any refueling. A copy of the Declaration of Inspection for Refueling is

SECTION 35 20 23 Page 6 on the web site indicated in the paragraph CONSTRUCTION FORMS AND DETAILS below.

1.10.2 Fueling Land-Based Equipment on Buck Island DMMA Site

Fueling of land-based equipment from tanks located on vessels moored at Buck Island will not be allowed. The Contractor shall comply with all Coast Guard requirements in regards to fueling of land-based equipment on Buck Island. The Contractor shall coordinate with the Coast Guard Captain of the Port to obtain additional special guidance pertaining to fueling of land-based equipment at the address below:

Jacksonville Captain of the Port USCG Sector Jacksonville 4200 Ocean Street Atlantic Beach, Florida 32233

(904) 564-7500

OPFAC# 0737100

1.11 SIGNAL LIGHTS

The Contractor shall display signal lights and conduct operations in accordance with the General Regulations of the Department of the Army and of the Coast Guard governing lights and day signals to be displayed by towing vessels with tows on which no signals can be displayed, vessels working on wrecks, dredges, and vessels engaged in laying cables or pipe or in submarine or bank protection operations, lights to be displayed on dredge pipe lines, and day signals to be displayed by vessels of more than 65 feet in length moored or anchored in a fairway or channel, and the passing by other vessels of floating plant working in navigable channels, as set forth in Commandant U.S. Coast Guard Instruction M16672.2, Navigation Rules: International-Inland (COMDTINST M16672.2), or 33 CFR 81 Appendix A (International) and 33 CFR 84 through 33 CFR 89 (Inland) as applicable.

1.12 NOTICE TO MARINERS -- DREDGING CONTRACTS

Should the Contractor, during operations, encounter any objects on the channel bottom which could be a hazard to navigation, the Contractor shall immediately notify the Contracting Officer as to the location of said object and shall provide any other pertinent information necessary for the Contracting Officer to prepare and issue a Notice to Mariners.

1.13 FINAL CLEANUP

Final cleanup, as stated in the paragraph COMMENCEMENT, PROSECUTION, AND COMPLETION OF WORK of Section 00700 CONTRACT CLAUSES in Volume 1, shall include the removal of all the Contractor's plant and equipment either for disposal or reuse. Plant and/or equipment and/or materials to be disposed of shall only be disposed in a manner and at locations approved by the Contracting Officer. Unless otherwise approved by the Contracting Officer, the Contractor will not be permitted to abandon any equipment in the disposal area or other areas adjacent to the worksite. Failure to promptly remove all plant, pipeline, equipment, and materials upon completion of the dredging will be considered a delay in the completion of the final cleanup and demobilization work. In such case, the Government will exercise its right as stated in Clause DEFAULT (FIXED-PRICE CONSTRUCTION) of Section 00700 CONTRACT CLAUSES in Volume 1 to remove any plant and/or equipment and/or materials at the Contractor's expense.

SECTION 35 20 23 Page 7

1.14 WORK VIOLATIONS

Work done in violation of these specifications or a verbal or written stop order of the Contracting Officer will be considered as unsatisfactory progress for purposes of progress payments in accordance with Clause PAYMENTS UNDER FIXED-PRICE CONSTRUCTION CONTRACTS of Section 00700 CONTRACT CLAUSES in Volume 1.

1.15 NATIONAL DREDGING QUALITY MANAGEMENT PROGRAM SYSTEM (HOPPER DREDGES

AND DUMP SCOWS)

1.15.1 System Requirements

See Section 35 20 26 NATIONAL DREDGING QUALITY MANAGEMENT PROGRAM SCOW - TRACKING PROFILE and Section 35 20 28 NATIONAL DREDGING QUALITY MANAGEMENT PROGRAM HOPPER DREDGE. However, in the event of NDQMP System failure (not fully operational), the Contractor shall notify the Contracting Officer, and all dredging operations for the vessel shall cease until the NDQMP System is fully operational. Any delays resulting from NDQMP System failure shall be at the Contractor's expense.

PART 2 PRODUCTS (NOT APPLICABLE)

PART 3 EXECUTION

3.1 NOTIFICATION OF COAST GUARD

3.1.1 Navigation Aids

Navigation aids located within or near the areas required to be dredged will be removed, if necessary, by the U.S. Coast Guard in advance of dredging operations. Notify the U.S. Coast Guard as indicated in paragraph SUBMITTALS above for relocation of navigation aids . The Contractor shall not remove, change the location of, obstruct, willfully damage, make fast to, or interfere with any aid of navigation.

3.1.2 Dredging Aids

The Contractor shall obtain approval from the U.S. Coast Guard for all buoys, dredging aid markers to be placed in the water, and dredging aid markers affixed with a light prior to the installation. Dredging aid markers and lights shall not be colored or placed in a manner that they will obstruct or be confused with navigation aids.

3.2 WORK AREA

The Contractor will be permitted to exclude the public from the work areas in the immediate vicinity of his dredging, transporting, and disposal operations. Enforcement shall be the Contractor's responsibility at no additional cost to the Government. The enforcement shall be coordinated with local enforcement agencies and will be subject to approval of the Contracting Officer.

3.2.1 Access

The Contractor shall be responsible for providing and maintaining access necessary for his equipment and plant to and from the work site, mooring area, and disposal area. The Contractor shall ascertain the environmental

SECTION 35 20 23 Page 8 conditions which can affect the access such as climate, winds, currents, waves, depths, shoaling, and scouring tendencies.

3.2.2 Protection of Existing Waterways

The Contractor shall conduct his operations in such a manner that material or other debris are not pushed outside of dredging limits or otherwise deposited in existing side channels, basins, docking areas, or other areas being utilized by vessels. The Contractor will be required to change his method of operations as may be required to comply with the above requirements. Should any bottom material or other debris be pushed into areas described above, as a result of the Contractor's operations, the same must be promptly removed by and at the expense of the Contractor to the satisfaction of the Contracting Officer.

3.2.3 Adjacent Property and Structures

No dredging will be permitted within 25 feet of any structure. Any damage to private or public property or structures resulting from the disposal or dredging operations shall be repaired promptly by the Contractor at his expense. Any damage to structures as a result of Contractor's negligence will result in suspension of dredging and require prompt repair at the Contractor's expense as a prerequisite to the resumption of dredging.

3.2.4 Subaqueous Cable Crossings

The Contractor shall be responsible for verifying the locations and depths of all utility crossings and take precautions against damages which might result from his operations, especially the sinking of dredge spuds and/or anchors into the channel bottom, in the vicinity of utility crossings. If any damage occurs as a result of his operations, the Contractor will be required to suspend dredging until the damage is repaired and approved by the Contracting Officer. Costs of such repairs and downtime of the dredge and attendant plant shall be at the Contractor's expense.

3.3 DISPOSAL OF EXCAVATED MATERIAL

3.3.1 General

The material to be excavated shall be placed in Upland Disposal Area Buck Island Cell A. The maximum material transportation distance for Buck Island Cell A is approximately 6.5 miles.

3.3.2 Upland Disposal Area

3.3.2.1 Mobilization/Demobilization to the Buck Island DMMA

Mobilization and demobilization of materials and heavy equipment to the Buck Island DMMA via Ft. Caroline Road shall be limited to weekdays only and shall be conducted only during daylight hours.

3.3.2.2 Location of Discharge Line

The Contractor shall configure the dredge or pump-out station discharge line to discharge near the northwest corner of into Cell A at the location indicated in the drawings subject to coordination indicated in Section 01 30 00 ADMINISTRATIVE PROCEDURES. The exact location of the discharge line is subject to the approval of the Contracting Officer. The Contractor shall maintain vehicular access across the discharge line at

SECTION 35 20 23 Page 9 all times. Access may be provided by an earthen crossover ramp and/or notching into the dike crest. The method of crossover construction shall be approved by the Contracting Officer's representative prior to construction. Upon completion of pumping operations and removal of the discharge line, the Contractor shall restore the dike crest and faces to their original lines and grades at the pipeline cross over location. This shall be accomplished by removing ramping material, refilling and compacting any notching that was cut into the dike crest, and regrading the dike crest to the pre-project elevation.

3.3.2.3 Concurrent Offloading Operations by Others

During the course of this contract, there will also be ongoing offloading operations at the Buck Island DMMA conducted by others. This offloading work utilizes existing haul roads that lie adjacent to the designated placement area in Cell A. These haul roads, indicated in the drawings, are for the exclusive use of the offloading operations and shall not be used by the Contractor's equipment or personnel. Furthermore, the Contractor shall coordinate his activities with the party conducting the offloading operation to avoid conflicts with site usage.

3.3.2.4 Maximum Height of Dredged Materials

Dredged materials and/or water shall not be placed higher than 2 feet below the lowest point on the dike crest. The Contractor shall constantly monitor the water height while pumping to insure that this clearance is maintained. Materials deposited in the disposal area above the maximum height or outside the disposal area will result in suspension of dredging operations and require the removal of such materials as a prerequisite to the resumption of dredging.

a. Drainage of areas adjacent to the diked disposal area shall not be blocked or impaired in any manner by the Contractor's operations.

The Contractor shall excavate and maintain ditches necessary to prevent blocking or impairing drainage. The ditches shall be of adequate number and size to eliminate all blockage or impairment of drainage adjacent to the diked disposal area.

3.3.2.5 Disposal Area Drainage

The Contractor shall, if necessary, excavate and maintain ditches to drain all low areas in the dredged material and disposal area to the weirs. The ditches shall be of adequate number and size to eliminate all ponding of water within the limits of the disposal area.

3.3.2.6 Preservation and Restoration of Landscape and Marine Vegetation Damages

The Contractor shall restore all landscape features and marine vegetation damaged or destroyed by his construction operations and other actions of his personnel and equipment during mobilization to the site, construction, and demobilization from the site. Restoration of damaged vegetation on the surfaces of the dike shall include but not be limited to reestablishing the proper surface grade by placing and compacting soil and topsoil as needed to restore washouts due to Contractor's damage, planting of a stand of perennial grass plants equivalent to the existing dike surface vegetation, and maintaining the planted vegetation until a satisfactory stand of grass is established. Such restoration shall be a part of the Environmental Protection Plan as defined in subparagraph

SECTION 35 20 23 Page 10

"Environmental Protection Plan" of paragraph SUBMITIALS above. This work shall be accomplished at the Contractor's expense.

3.3.2.7 Weir Operations

From commencement of dredging, the operation of the weir system needs to be managed to minimize the return of suspended solids and associated turbidity to the receiving water body to meet contract and permit requirements. The dredging Contractor, with oversight provided by the Contractor's quality control manager and the Corps' quality assurance representative, will monitor and manage the dredge output and the weirs to control water elevation, ponding depth, dredge inflow rote, and other parameters to maintain effluent discharge from the DMMA at or below required turbidity standards. Weir stacks shall be fully operational during all phases of the dredging operation, and the weir crests shall be maintained at equal elevations with equal flow over the weirs, unless otherwise approved by the Contracting Officer in writing. Note that in the special case where placement of dredged material is accomplished without discharge, the weirs shall be sealed by closing the flap gate and the weir riser boards shall be placed to the maximum elevation.

3.3.2.7.1 Maximum Ponding Depth

Unless otherwise established in the dredging contract specifications, the maximum ponding depth shall be controlled or limited by the water elevation necessary to meet the minimum required freeboard.

3.3.2.7.2 Weir Boards

The weir boards specified for use at Buck Island DMMA are the lightweight composite material type. This type of weir board provides a good water seal to deter leakage between and around the weir boards. The individual boards are much lighter and easier to install and remove than equivalent size wooden weir boards; yet, since they are hollow, they have the advantage that they sink and are therefore not subject to floating up and becoming dislodged.

3.3.2.7.3 Lighting

Weir stacks and surrounding area shall be lighted during night-time operations. All lighting shall be in accordance with EM 385-1-1 .

3.3.2.7.4 Night-Time Visual Monitoring

During night-time operations or any other period when turbidity monitoring is not active, the Contractor shall visually monitor the water flow over and through the weirs for any signs of elevated turbidity. Any visual indication of elevated turbidity shall he immediately reported to the Quality Control Manager.

3.3.2.7.5 Decanting

After dredging is complete, the incremental removal of weir boards aids in the slow release of the clarified surface water from the basin over the weir crest. The process of decanting continues after dredging is complete until all residual ponded water is released over the weirs. During decanting, the weirs shall be actively managed to meet turbidity standards and minimize the return of suspended solids and associated turbidity to the receiving water body.

SECTION 35 20 23 Page 11

3.3.2.7.6 Water Surface Elevation

During dredging, when the water surface elevation within Cell A is above Elevation 30 feet, NAVD88, dike inspection frequency shall be increased to every 4 hours.

3.3.3 Barges

Water and dredged materials shall not be permitted to overflow or spill out of barges while transporting to the disposal site. Failure to repair leaks or change the method of operation which is resulting in overflow or spillage will result in suspension of dredging operations and require prompt repair or change of operation to prevent overflow or spillage as a prerequisite to the resumption of dredging.

3.3.4 Placing of Dredged Material

During placement of dredged material in the disposal areas, the Contractor will be required to provide constant radio contact between the dredge and the disposal areas. This will enable the Contractor's personnel at the disposal areas to immediately notify the dredge in the event of dike or pipeline failure. In the event of dike or pipeline failure, the dredging operations shall be immediately suspended and require prompt repair of the dike or pipeline as a prerequisite to the resumption of dredging.

3.3.5 Dredge Pipelines

3.3.5.1 Dredge Discharge Pipeline

The Contractor shall plainly mark the pipeline access routes with conspicuous stakes, targets and/or buoys to be maintained throughout the contract operations. A tight dredge discharge pipeline shall be maintained to prevent spilling of dredged material or dredge water outside of the disposal area. The pipeline shall be inspected at least twice daily for leaks. Any damage to private or public property resulting from the Contractor's operations shall be repaired by the Contractor at his expense.

3.3.5.2 Submerged Pipeline

In the event the Contractor elects to submerge his pipeline, the pipeline shall rest on the bottom, and the top of the submerged pipeline and any anchor securing the submerged pipeline shall be no higher than the required project depth for the channel in which the submerged pipeline is placed. Should the Contractor elect to use a pipeline material which is buoyant or semi-buoyant, such as PVC pipe or similar low density materials, the Contractor shall securely anchor the pipeline to prevent the pipeline from lifting off the bottom under any conditions. The Contractor shall make daily inspections of the submerged pipeline to ensure buoyancy has not loosened the anchors. The Contractor shall remove all anchors when the submerged pipeline is removed. The location of the entire length of submerged pipeline shall be marked with signs, buoys, lights, and flags conforming to U.S. Coast Guard regulations.

3.3.5.3 Floating Pipeline

Should the Contractor's pipeline not rest on the bottom, it will be considered a floating pipeline and shall be visible on the surface and

SECTION 35 20 23 Page 12 clearly marked. In no case will the Contractor's pipeline be allowed to fluctuate between the surface and the bottom, or lie partly submerged.

Lights shall be installed on the floating pipeline as required in paragraph SIGNAL LIGHTS above. The lights shall be supported either by buoys or by temporary piling, provided by the Contractor and approved by the Contracting Officer. Where the pipeline does not cross a navigable channel, the flashing yellow all-around lights shall be spaced not over 200 feet apart, unless closer spacing is required by U.S. Coast Guard personnel, in which case the requirements of the U.S. Coast Guard shall govern, at no additional cost to the Government.

3.3.6 Booster Pumps

Any booster pumps installed by the Contractor shall be located at least 300 feet from any residential-type building or house. Booster pumps, their prime movers, and any auxiliary equipment shall be fitted or equipped with mufflers, noise control enclosures, or other engineering noise control methods, measures, and features such that steady noise emanating from this equipment does not exceed 85 decibels on the A scale at slow response, and impulsive noise does not exceed 140 decibels. Such items shall be maintained throughout the course of the work.

3.4 REQUIRED DEPTH, ALLOWABLE OVERDEPTH, AND SIDE SLOPES

3.4.1 Required Depth

The material actually removed from the designated areas to be dredged, to a depth of not more than the required depth shown on the drawings, will be estimated and paid for in accordance with the provisions contained in the subparagraphs "Measurement" and "Payment" of Section 01 22 00 MEASUREMENT

AND PAYMENT.

3.4.2 Allowable Overdepth

To cover the inaccuracies of the dredging process, material actually removed from the designated areas to be dredged, to a depth below the required depth of not more than the allowable overdepth shown on the drawings, will be measured and paid for in accordance with the provisions contained in the subparagraphs "Measurement" and "Payment" of Section

01 22 00 MEASUREMENT AND PAYMENT.

3.4.3 Side Slopes

Although dredging of side slope material may be necessary to provide the required project channel dimensions (depth and width), the side slopes shown on the drawings are provided for payment purposes only. Side slopes may be formed by box cutting, step cutting, or dredging along the side slope. Material actually removed, within the limits approved by the Contracting Officer, to provide for final side slopes not flatter than that shown on the contract drawings, but not in excess of the amount originally lying above this limiting side slope, will be measured and paid for in accordance with the provisions contained in subparagraphs "Measurement" and "Payment" of Section 01 22 00 MEASUREMENT AND PAYMENT.

Such amount will be estimated and paid for whether dredged in original position or by box cut dredging whereby a space is dredged below the allowable side slope plane on the bottom of the slope for upslope material capable of falling into the cut. End slopes and transition slopes will not be estimated or paid for under this contract. In such cases, a 0 horizontal on 1 vertical will be used with no upslope allowance provision

SECTION 35 20 23 Page 13 applied outside the required prism.

3.4.4 Excessive Dredging

It is recognized that the limits of dredging need to extend beyond the pay prism in order to remove material from within the pay prism. Therefore, the limits of active dredging may exceed the limits of the pay prism in vertical dimension as well as horizontal dimension to the extent necessary to remove material from the pay prism. Indirect impacts (sideslope sloughing, etc) may extend even beyond the limits of active dredging.

Nevertheless, material taken from beyond the limits of the pay prism as described in subparagraphs "Allowable Overdepth" and "Side Slopes" above will be deducted from the total amount dredged as excessive overdepth dredging, or excessive sideslope dredging, for which payment will not be made. Nothing herein shall be construed to prevent payment for the removal of shoals performed in accordance with the applicable provisions of the paragraphs FINAL EXAMINATION AND ACCEPTANCE or SHOALING of this Section.

3.4.5 Areas to be Dredged

Based on information currently available to the Government, areas known to require dredging are depicted on the drawings as hatched areas. The actual areas to be dredged may vary from the hatched areas shown in the drawings. In order to provide the required project dimensions within and throughout the project limits shown on the drawings, the Contractor shall remove material located within the project limits as directed by the Contracting Officer, regardless of whether the material is located in a hatched area or not. Payment for all dredged material dredged from a hatched area will be made at the applicable contract unit price. Payment for all material dredged from a non-hatched area may be made at the applicable contract unit price; however, the Contractor may request an adjustment to the contract unit price in accordance with DFAR Clause 252.243-7002 REQUESTS FOR EQUITABLE ADJUSTMENT and/or FAR Clause 52.243-4 CHANGES of Section 00700 CONTRACT CLAUSES in Volume 1.

3.4.6 Acceptance Sections

For purposes of payment, the work to be done will be divided into acceptance sections. Prior to any dredging, the Contractor shall prepare and provide a proposed acceptance sections plan for approval by the Contracting Officer. Generally, the work should be divided into areas that equate to approximately 30 days of dredging or that constitute separable or definable features of work

3.5 SURVEYS

3.5.1 General

The Contracting Officer shall be notified, in writing, 10 days in advance of the need for pre-dredging and after-dredging surveys. Surveys will be performed in accordance with the paragraph QUANTITY SURVEYS of Section 00700 CONTRACT CLAUSES in Volume 1; paragraph LAYOUT OF WORK of Section 01 11 00 SUMMARY OF WORK; Section 01 45 05 DREDGING/BEACH FILL PLACEMENT -

CONTRACTOR QUALITY CONTROL; EM 1110-1-1000 , EM 1110-1-1002 , EM 1110-1-1003 ,

EM 1110-1-1004 , EM 1110-1-2909 , and EM 1110-2-1003 ; FBPSM; and, TSS. A copy of the EM's can be downloaded from the following web site:

http://www.publications.usace.army.mil/USACEPublications/EngineerManuals.aspx.

A copy of the TSS can be downloaded from the following web site:

SECTION 35 20 23 Page 14 https://cadbimcenter.erdc.dren.mil/.

3.5.2 Contractor Representative

The Contractor or his authorized representative will be notified when soundings and/or sweepings are to be made, and will be offered the opportunity to be on board the Government survey vessel, but may decline the offer. All in-place measurement surveys and final acceptance sweep surveys will be performed by the Government. The Contractor's representative shall be fully knowledgeable in offshore construction subsurface surveying procedures, techniques, equipment, and horizontal and vertical calibration methods, and state-of-the-art horizontal and vertical accuracy limitations. The Contractor's representative may observe and review, in progress, the adequacy and accuracy of the survey for in-place payment purposes, and for the potential existence of collusion, fraud, or obvious error in the data.

3.5.3 Survey Certification

a. Immediately upon completion of any survey, the Contractor's representative shall, based on his on-site review of the survey execution, determine that the survey contains no evidence of collusion, fraud, obvious error, and that subsequent horizontal and vertical corrections are accurately annotated on the subsurface record.

b. The Contractor's authorized representative shall bring aboard the survey vessel a blank copy of the Certification Statement and shall attest to an acceptable survey by signing the Certification Statement before leaving the vessel. Sample copy of the Certification Statement is on the web site indicated in paragraph CONSTRUCTION FORMS AND DETAILS below.

c. In the event the Contractor's authorized representative observes (and quantifies) specific documentary evidence of either fraud, collusion, or obvious error, the survey will be immediately rerun.

Resurveys will totally supersede any previously run survey and will be run over the full reach of any particular Acceptance Section.

d. If acceptability is not acquired after performing one resurvey of an Acceptance Section, a meeting shall be held between the Contractor and the Contracting Officer to expeditiously resolve the issue causing rejection of the survey. Contractor equipment and personnel standby time to resolve acceptability of the survey shall be at the Contractor's expense.

e. In no case shall a previously unacceptable survey be later judged acceptable by the Contractor; unless such a reassessment/reevaluation is performed within 24 hours after the original survey, and prior to initiating any resurvey action based upon identifiable collusion, fraud, or obvious error.

f. Should the Contractor or his authorized representative refuse to certify to the acceptability of a survey for contract payment without identifiable collusion, fraud, or obvious error, then the following actions will follow:

(1) Preconstruction (pre-dredging) Survey: Excavation shall not commence until representatives of the Contractor and Contracting Officer have met and resolved the basis for refusal of

SECTION 35 20 23 Page 15 certification. Should the Contractor commence excavation prior to obtaining an acceptable survey, he shall be liable for any excavation performed. If a resurvey is performed, and accepted, prior excavation will not be measured, estimated, or paid for.

(2) Post-Construction (after-dredging) Survey: The 3-week survey window allowed under subparagraph "Measurement" of Section 01 22 00 MEASUREMENT AND PAYMENT will be indefinitely extended until a final survey is accepted. Any material accretion which might occur due to such a time extension will neither be measured, estimated, or paid for.

(3) Refusal to Certify: Contractor equipment and personnel standby time to resolve his refusal to certify to the acceptability of a survey when there is no identifiable collusion, fraud, or obvious error shall be at the Contractor's expense and resultant delays shall not be the basis for time extensions of the contract.

g. Intermediate surveys taken between the pre-dredging and post-dredging surveys will not be considered for the purposes of determining quantities for final payment and acceptance of the area dredged.

3.5.4 Tide Data

3.5.4.1 Real Time Kinematic (RTK) GPS

The Government will utilize RTK GPS for determining Real Time water levels (tide corrections) for measurement and payment purposes. The Contractor is responsible for providing all applicable RTK equipment for surveying and dredging operations.

3.5.4.2 Kinematic Tidal Datum

A file listing the separations between NAVD 88 and the Chart Datum (Mean Lower Low Water) will be provided to the Contractor for entry into the hydrographic survey software. The Kinematic Tidal Datum file shall be obtained from the Construction Representative prior to commencing surveying and dredging operations.

3.6 INSPECTION

3.6.1 Quality Assurance Representative (QAR)

The QAR shall be notified prior to the establishment of horizontal control work (baseline layout, ranges, station flags, shore-based control for EPS/RPS, etc.) and vertical control work (tide staff(s), upland cross sections, construction elevations top/invert, maximum/minimum elevations of dredged materials within disposal area(s), etc.), but the presence or absence of the QAR shall not relieve the Contractor of his responsibility for proper execution of the work in accordance with the specifications.

The Contractor will be required:

a. To furnish, on the request of the Contracting Officer or any QAR, the use of such boats, boatmen, laborers, and material forming a part of the ordinary and usual equipment and crew of the dredging plant as may be reasonably necessary in inspecting and supervising the work.

SECTION 35 20 23 Page 16

b. To furnish, on the request of the Contracting Officer or any QAR, suitable transportation from all points on shore designated by the Contracting Officer to and from the various pieces of plant, and to and from the disposal area.

3.6.2 Failure to Comply

In conjunction with the Clause INSPECTION OF CONSTRUCTION of Section 00700 CONTRACT CLAUSES of Volume 1, should the Contractor refuse, neglect, or delay compliance with these requirements, the specific facilities may be furnished and maintained by the Contracting Officer and the cost thereof will be deducted from any amounts due or to become due the Contractor.

3.7 FINAL EXAMINATION AND ACCEPTANCE

3.7.1 Final Examination of Work

As soon as practicable and no later than three (3) weeks after the completion of the entire work or any section thereof (if the work is divided into sections) as in the opinion of the Contracting Officer will not be subject to damage by further operations under the contract, such work will be thoroughly examined at the cost and expense of the Government by sounding or by sweeping, or both, as determined by the Contracting Officer. Should any shoals, lumps, or other lack of contract depth be disclosed by this examination, the Contractor will be required to remove same by dragging the bottom in accordance with the subparagraph "Bed Leveling" below or by dredging at the contract rate of dredging.

The Contractor or his authorized representative will be notified when soundings and/or sweepings are to be made and will be permitted to accompany the survey party. When the area is found to be in a satisfactory condition, it will be accepted finally. Should more than two sounding or sweeping operations by the Government over an area be necessary by reason of work for the removal of shoals disclosed at a prior sounding or sweeping, the cost of such third and any subsequent soundings or sweeping operations will be charged against the Contractor at the rate of $5,500 per day for each day in which the Government plant is engaged in sounding or sweeping and/or is enroute to or from the site or held at or near the said site for such operation.

3.7.2 Bed Leveling

Bed leveling by dragging the bottom with a drag bar or other apparatus shall be allowed only in the designated dredging areas shown on the drawings. Dragging in areas outside of the designated dredging areas shown on the drawings is specifically prohibited without written approval of the Contracting Officer.

3.7.3 Bed Leveling - Reporting and Documenting

The Contractor shall fully document all bed leveling activity including date and time for initiation and completion of bed leveling. All bed leveling activity shall be documented on the Contractor's Quality Control Report (QCR).

3.7.4 Final Acceptance

Final acceptance of the whole or a part of the work and the deductions or

SECTION 35 20 23 Page 17 corrections of deductions made thereon will not be reopened after having once been made, except on evidence of collusion, fraud or obvious error, and the acceptance of a completed section shall not change the time of payment of the retained percentages of the whole or any part of the work.

3.8 SHOALING

If, before the contract is completed, shoaling occurs in any section previously accepted, including shoaling in the finished channel because of the natural lowering of the side slopes, redredging at contract price, within the limits of available funds may be done if agreeable to both the Contractor and the Contracting Officer.

3.9 CONTINUITY OF WORK

No payment will be made for work done in any area designated by the Contracting Officer until the full depth required under the contract is secured in the whole of such area, unless prevented by in-situ rock, nor will payment be made for excavation in any area not adjacent to and in prolongation of areas where full depth has been secured, except by decision of the Contracting Officer. Should any such nonadjacent area be excavated to full depth during the operations carried on under the contract, payment for all work therein may be deferred until the required depth has been made in the area intervening. The Contractor may be required to suspend dredging at any time when, for any reason, the gauges or ranges cannot be seen or properly followed.

3.10 NOISE CONTROL

All hauling and excavating equipment and dredge/barges, boats, and tugs used on this work shall be equipped with satisfactory mufflers or other noise abatement devices. The Contractor shall conduct his operations so as to comply with all Federal, State and local laws pertaining to noise.

The use of horns and whistle signals shall be held to the minimum necessary in order to ensure as quiet an operation as possible.

3.11 DREDGE CERTIFICATION

During dredging operations the Contractor's dredge shall have a current Certificate of Inspection issued by the U.S. Coast Guard.

3.12 GENERAL DREDGING SAFETY REQUIREMENTS

3.12.1 Dredge Plant Restriction Definitions

To increase the safety of dredges on Federal contracts, the contract plans and specifications may identify a location within the Federal channel (usually indicated by a channel station or navigation aid) requiring minimum equipment standards. This is a Certification Required Line (CRL). The following are specific designations that may apply to this contract.

3.12.1.1 Certification Required Line - Coast Guard Inspected (CRL-C)

A designation of Certification Required Line - Coast Guard inspected (CRL-C) means only dredges with a current U.S. Coast Guard Certificate of Inspection for the intended use of the vessel will be allowed to work seaward of this line under this contract. The inspections shall include both topside and drydock. The topside inspection shall have occurred with

SECTION 35 20 23 Page 18

15 months prior to the date that dredging commences. The drydock inspection shall have occurred within 3 years prior to the date that dredging commences.

3.12.1.2 Certification Required Line - Load Line (CRL-L)

A designation of Certification Required Line - Load Line (CRL-L) means only dredges having a current Load Line Certification issued pursuant to 46 CFR 41-47 will be allowed to work seaward of this line under this contract. Load Line inspections may be performed by either the American Bureau of Shipping (ABS) or Des Nortke Veritas (DNV) on behalf of the U.S.

Coast Guard. The statutory requirement for Load Line Certification is 46 U.S.C. 5101-5116.

3.12.1.3 Certification Required Line - Hopper (CRL-H)

A designation of Certification Required Line - Hopper (CRL-H) means only hopper dredges with a current U.S. Coast Guard Certificate of Inspection for the intended use of the vessel will be allowed to work seaward of this line under this contract. The inspections shall include both topside and drydock. The topside inspection shall have occurred with 15 months prior to the date that dredging commences. The drydock inspection shall have occurred within 3 years prior to the date that dredging commences.

3.12.2 Certification of Attendant and Auxiliary Plant

In addition to the requirements of EM 385-1-1 , Section 19, Subparagraph 19.A.01.b., all supporting floating plant for dredging operations (to include, but not limited to, anchor barges, deck barges, deck/work barges, tug boats, tenders, workboats, pump-out barges, derrick barges, and spider barges) shall have a current marine survey inspection certificate. The only exceptions to this requirement include pipeline support pontoons or floats and outboard skiffs under 16 feet in length. The certification shall have been issued by a licensed and accredited marine surveyor within the previous 12 months. The marine surveyor must be accredited by either the National Association of Marine Surveyors or the Society of Accredited Marine Surveyors. No attendant plant that does not have a valid certification shall be used on this contract. The certifications and inspection shall be appropriate for the intended use of the plant in all locations specified in this contract. Unless the Contracting Officer decides otherwise, documentation of the inspection for each piece of plant shall be provided prior to issuance of Notice to Proceed.

3.12.3 Minimum Tow-Boat Requirements

In addition to the requirements of EM 385-1-1 , Section 19, Subparagraph 19.A.03.e., when dredging with non-self propelled dredges seaward of the CRL-L or CRL-C, the contractor shall provide the following.

a. One primary towboat of adequate size and horsepower to move any and all attendant and support plant against prevailing tides, currents, and winds during normal and severe weather conditions.

The towboat shall be available within the project work area at all times.

b.…