Revisied sct 35 20 23.pdf

MAINTENANCE DREDGING IN LOWER CHARLESTON HARBOR W912HN-09-B-0016

SECTION TABLE OF CONTENTS 35 20 23 PAGE 1

SECTION TABLE OF CONTENTS

SITE WORK

SECTION 35 20 23

DREDGING

PART 1 GENERAL

1.1 WORK COVERED BY CONTRACT PRICE

1.1.1 General

1.1.2 Mobilization and Demobilization

1.1.3 Dredging Work

1.2 SUBMITTALS

1.3 CHARACTER OF MATERIALS

1.3.1 Character of Materials

1.3.2 Debris

1.4 ESTIMATED QUANTITIES

1.4.1 Estimated Quantities

1.4.2 Shoaling Rates

1.4.3 Funds

1.5 OVERDEPTH AND SIDE SLOPES

1.5.1 Required Dredging Prism

1.5.2 Allowable Overdepth Prism

1.5.3 Side Slopes

1.5.4 Excessive Dredging

1.6 SHOALING (1965 APR OCE)

1.7 CONTINUITY OF WORK (1965 APR OCE)

PART 2 PRODUCTS (Not Applicable)

PART 3 EXECUTION

3.1 DREDGING

3.1.1 Dredging Plan of Operation

3.1.2 Dredging Monitoring and Data Collection Systems

3.1.2.1 Silent Inspector System (SIS)

3.1.3 Electronic Positioning of the Dredge

3.1.3.1 Horizontal Positioning of the Dredge

3.1.3.2 Horizontal Positioning of Surveys

3.1.3.3 Vertical Positioning of Surveys

3.1.4 Overflow Time

3.1.4.1 Overflow During Dredging Operations

3.1.4.2 Overflow During Transport

3.2 INSPECTION

3.2.1 Inspection Requirements

3.2.2 Noncompliance

3.3 ORDER OF WORK

3.4 PLANT

3.4.1 General

3.4.1.1 Equipment and Machinery

3.4.1.2 Capacity of Plant

3.4.1.3 Walkways and Guardrails

3.4.2 Pipelines

3.4.2.1 Condition of Pipelines

3.4.2.2 Submerged Pipeline

3.4.2.2.1 Placement of Pipeline

3.4.2.2.2 Buoyant or Semi-buoyant Pipeline

3.4.2.2.3 Marking the Location of the Pipeline

3.4.2.2.4 Inspections

3.4.2.2.5 Removal of Related Equipment

3.4.2.3 Floating Pipeline

3.4.2.4 Location of Pipelines

SECTION TABLE OF CONTENTS 35 20 23 PAGE 2

3.4.3 Placement of Lights

3.4.4 Buoys

3.4.5 Submerged Pipeline or Fittings

3.4.6 Lights, Lighted Buoys, and Dredging Aids Marker

3.4.7 Noncompliance

3.4.8 Plant Removal

3.5 SIGNAL LIGHTS (DAEN PRP ON-TIME 12 JUL 1984)

3.6 NAVIGATION AIDS AND DREDGING AIDS

3.6.1 Relocation of Navigation Aids for Dredging

3.6.2 Aids to Navigation within the Dredging Areas

3.7 COMMUNICATIONS

3.8 AUTOMATIC IDENTIFICATION SYSTEM (AIS).

3.9 DISPOSAL OF EXCAVATED MATERIAL

3.9.1 Ocean Dredged Material Disposal Site (ODMDS)

3.9.2 Surface Transport of Dredged Material

3.9.2.1 Emergency Dumps

3.9.3 Location of Disposal of Dredged Material

3.9.4 Disposal Area Maps

3.9.5 Report

3.9.6 Location of Pipeline Outfall Points (Pipeline Only)

3.10 OCEAN DISPOSAL VERIFICATION

3.10.1 Silent Inspector

3.10.2 Verification Spreadsheet

3.11 MISPLACED MATERIAL

3.11.1 General

3.11.2 Misplaced Material

3.12 SURVEILLANCE OF OCEAN DISPOSAL

3.12.1 Responsibility

3.12.2 Coast Guard Notification

3.12.3 Quarters and Meals

3.12.4 Documentation

3.13 DATUM AND BENCH MARKS

3.14 MISPLACED MATERIAL (JAN 87)

3.15 MEASUREMENT AND PAYMENT

3.15.1 Measurement

3.15.2 Adjacent Acceptance Sections

3.15.3 Surveys

3.15.3.1 Survey Equipment

3.15.3.2 Dispute of Surveys Performed by Government

3.15.4 Payments

3.16 FINAL EXAMINATION AND ACCEPTANCE

3.16.1 Examination

3.16.2 Acceptance

3.16.3 Acceptance of Work

3.17 ACCOMMODATIONS AND MEALS FOR QUALITY ASSURANCE REPRESENTATIVES

(1965 APR OCE)

3.17.1 Office

3.17.2 Subsistence

-- End of Section Table of Contents -

SECTION 35 20 23 PAGE 1

SECTION 35 20 23

DREDGING

PART 1 GENERAL

1.1 WORK COVERED BY CONTRACT PRICE

1.1.1 General

The work covered by this section consists of furnishing all plant, equipment, labor and materials, and performing all work required for the removal and disposal of all material, layout and accomplishment of all dredging work, and the movement of plant in accordance with these specifications and as indicated on the contract drawings.

1.1.2 Mobilization and Demobilization

The work required by Bid Item 0001 shall include all costs connected with the mobilization and demobilization of all the Contractor's plant and equipment.

1.1.3 Dredging Work

The work required by Bid Items 0002 - 0014 shall include the cost of removal and disposal of all material and the layout and accomplishment of all work, as specified herein or indicated on the contract drawings.

The contract price per cubic yard for dredging shall be applicable to quantities in any extensions of the shoal except as provided in Section 00800, contract clause VARIATIONS IN ESTIMATED QUANTITIES and paragraph

VARIATIONS IN ESTIMATED QUANTITIES - DREDGING.

1.2 SUBMITTALS

Government approval is required for all submittals with a "GA" designation; submittals having an "FIO" designation are for information only.

-Stoplog Certification; GA

1.3 CHARACTER OF MATERIALS

1.3.1 Character of Materials

Materials to be excavated are principally those which accumulated as a result of shoaling that has occurred since the areas were last dredged.

1.3.2 Debris

Various debris such as logs, misplaced riprap, chains, buoy anchors, cables, miscellaneous trash, etc., may be encountered during dredging operations. If in the judgment of the Contracting Officer it can be removed during normal dredging operations, it shall be removed by the Contractor. This debris shall become the property of the Contractor and shall be removed from the jobsite. The removal and disposal of this debris shall be accomplished at no additional cost to the Government.

Disposal of debris will not be permitted on the riverbanks, in navigable waterways or disposal areas unless otherwise specified.

SECTION 35 20 23 PAGE 2

1.4 ESTIMATED QUANTITIES

1.4.1 Estimated Quantities

The total estimated quantity of material necessary to be removed from within the specified limits to complete the work are as follows:

BASE BID:

SHOAL

REQUIRED

DEPTH AND

ASSOCIATED

SIDE SLOPES

C.Y. *

ALLOWABLE

OVERDEPTH

AND

ASSOCIATED

SIDE SLOPES

C.Y. **

TOTAL

QUANTITIES

C.Y.

SHOAL 1 @32’ +2’ @34’

TIDEWATER REACH 23,000 31,000 54,000

10+00 TO 30+50

SHOAL 2 @47’ +2’ @49’

LOWER TOWN CREEK REACH 125,000 97,000 222,000

41+85 TO 73+76

SHOAL 3 @47’ +2’ @49’

CUSTOM HOUSE REACH 29,000 48,000 77,000

43+83 TO 64+06

SHOAL 4 @47’/37’ +2’ @49’/39’

LOWER TOWN CREEK TURNING BASIN 7,000 20,000 27,000

73+76 TO 87+95

SHOAL 5 @47’ +2’ @49’

HOG ISLAND REACH 59,000 100,000 159,000

286+00 TO 336+00

SHOAL 6 @47’ +2’ @49’

DRUM ISLAND REACH 12,000 20,000 32,000

386+00 TO 404+00

SHOAL 7 @47’ +2’ @49’

LOWER WANDO RIVER 5,000 28,000 33,000

6+00 TO 32+59

SHOAL 8 @47’ +2’ @49’

UPPER WANDO RIVER 96,000 95,000 191,000

105+15 TO 123+43

SHOAL 9 @47’ +2’ @49’

WANDO TURNING BASIN 7,000 13,000 20,000

85+29 TO 105+15

SHOAL 10 @47’ +2’ @49’

SECTION 35 20 23 PAGE 3

MYERS BEND 5,000 7,000 12,000

416+74 TO 427+00

SHOAL 11 @47’ +2’ @49’

MIDDLE WANDO RIVER 15,000 26,000 41,000

32+59 TO 58+00

TOTAL 383,000 485,000 868,000

OPTIONS:

SHOAL

REQUIRED

DEPTH AND

ASSOCIATED

SIDE SLOPES

C.Y. *

ALLOWABLE

OVERDEPTH

AND

ASSOCIATED

SIDE SLOPES

C.Y. **

TOTAL

QUANTITIES

C.Y.

SHOAL 1 @35’ +2’ @37’

TIDEWATER REACH 85,000 70,000 155,000

10+00 TO 30+50

SHOAL 2 @49’ +2’ @51’

LOWER TOWN CREEK REACH 222,000 138,000 360,000

41+85 TO 73+76

SHOAL 6 @51’ +2’ @53’

DRUM ISLAND REACH 100,000 60,000 160,000

386+00 TO 404+00

SHOAL 9 @49’ +2’ @51’

WANDO TURNING BASIN 20,000 38,000 58,000

85+29 TO 105+15

SHOAL 10 @49’ +2’ @51’

MYERS BEND 12,000 15,000 27,000

416+74 TO 427+00

TOTAL 439,000 321,000 760,000

NOTE:

* 1. Required depth will be as shown on the contract drawings unless any options are awarded as identified in the table.

* 2. The required dredging prism quantities include the optional side slope material associated with the required depth.

** 3. The two feet (2’) allowable overdepth quantities include optional side slope materials associated with the allowable overdepth.

1.4.2 Shoaling Rates

In order to allow for shoaling which will occur between the times of surveys shown on the contract drawings and pre-dredging surveys, the computed quantities for maintenance dredging have been increased based

SECTION 35 20 23 PAGE 4

on historical shoaling rates for the individual shoals. The resulting increased quantities are shown above.

1.4.3 Funds

Within the limit of available funds, the Contractor will be required to excavate the entire quantity of material necessary to complete the work specified herein, be it more or less than the amounts above estimated, all work to be done in accordance with the contract at the contract price or prices, except as may be affected by Section 00800, contract clause VARIATIONS IN ESTIMATED QUANTITIES and paragraph VARIATIONS IN

ESTIMATED QUANTITIES - DREDGING.

1.5 OVERDEPTH AND SIDE SLOPES

1.5.1 Required Dredging Prism

The Contractor shall dredge all shoals to the required depths as indicated on the contract drawings. The Contractor is required to cut the channel vertically to the required depth along each toe: however, the Contractor will be paid for material removed from the side slopes as described in paragraph SIDE SLOPES below.

1.5.2 Allowable Overdepth Prism

To cover inaccuracies of the dredging process, material actually removed from within the specific areas to be dredged to a depth of not more than two feet (2’) below the required elevation as shown on the contract drawings will be computed and paid for at the contract price. This material is considered to be optional and shall not be considered for purposes of determining any variation in quantity. See Section 00800, paragraph VARIATIONS IN ESTIMATED QUANTITY – DREDGING.

1.5.3 Side Slopes

Dredging of side slopes is not required. The Contractor is required to cut the channel vertically to the required depth at the channel toe.

Material actually removed from outside the required section shown on the contract drawings as lying between the vertical cut and the maximum pay slope plane will be computed and paid for at the dredging unit cost per cubic yard for that shoal area. Up to 100 percent of the material lying in this zone as calculated from the before dredging survey will be paid for at the dredging unit cost per cubic yard, if actually removed. For the purpose of dredging, the side slopes constitute a payment prism and are not intended as design criteria. Side slopes may fall flatter than those shown on the contract drawings; however, no payment will be made for material removed outside these specified limits.

1.5.4 Excessive Dredging

Material taken from beyond the limits as extended in the provisions of paragraphs, "Overdepth" and "Side Slopes" above will be considered as excessive 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 Section 35 20 23, paragraph FINAL EXAMINATION AND ACCEPTANCE or paragraph SHOALING and as applicable and as further set forth under paragraph MEASUREMENT AND PAYMENT.

1.6 SHOALING (1965 APR OCE)

If before the contract is completed, shoaling occurs in any section previously accepted, including shoaling in the finished channel because

SECTION 35 20 23 PAGE 5

of the natural lowering of the side slopes, dredging at contract price, within the limits of available funds, may be done if agreeable to both the Contractor and the Contracting Officer. This will include the dredging of adjacent horizontal extensions to the shoals included under this contract.

1.7 CONTINUITY OF WORK (1965 APR OCE)

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, 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 gages or ranges cannot be seen or properly followed.

PART 2 PRODUCTS (Not Applicable)

PART 3 EXECUTION

3.1 DREDGING

3.1.1 Dredging Plan of Operation

Prior to any dredging work, the Contractor shall submit a Dredging Plan of Operations for review and comment. Dredging shall not commence until all comments have been answered to the satisfaction of the Contracting Officer. The plan shall show barge anchoring locations; dredging lines;

description of scow overflow operations; instrumentation used;

coordinates and land elevation of all control points for electronic positioning and mean low water determination; estimated daily dredge advances; quality control survey procedures; anticipated problem areas of project; and procedures to assure that dredging will proceed within the contract template and be performed in the most economical manner.

The plan shall be updated and submitted on a weekly basis to allow notification to the local maritime community.

3.1.2 Dredging Monitoring and Data Collection Systems

The dredge excavation plant used on this project is required to operate with instrumentation so that position and performance parameters of dredging vessels and scows, if used, can be monitored. The monitoring and data collection systems shall be acquired, installed, calibrated, operated and maintained by the Contractor.

3.1.2.1 Silent Inspector System (SIS)

The Silent Inspector System (SIS) shall be utilized for all scows and disposal barges. The Silent Inspector System shall meet the requirements specified in Section 02 32 90 SCOW SILENT INSPECTOR SYSTEM for describing the requirements, calibration, performance, data storage, delivery, and inspection requirements for the dredging operations monitoring system.

3.1.3 Electronic Positioning of the Dredge

3.1.3.1 Horizontal Positioning of the Dredge

During all dredging operations, the Contractor shall use a differential global positioning system (DGPS) to monitor and control the horizontal

SECTION 35 20 23 PAGE 6

positioning of the dredge and scows. This equipment shall be installed on the dredge and scow and be in operation at all times during dredging and disposal operation. This equipment shall also be utilized to locate discharge of the pipeline dredge, if used.

3.1.3.2 Horizontal Positioning of Surveys

The Contractor shall use an electronic horizontal positioning system for conducting hydrographic surveys. The electronic horizontal positioning system for the survey processes shall be differential GPS with a minimum horizontal positioning system accuracy of 2 meters as required by EM 1110-2-1003, Hydrographic Surveying, dated 1 January 2002.

3.1.3.3 Vertical Positioning of Surveys

Vertical Positioning for the Dredge during all dredging operations, and hydrographic surveys shall be referenced to a government-installed tide gauge set to the datum specified in para. 3.13 DATUM AND BENCHMARKS.

3.1.4 Overflow Time

3.1.4.1 Overflow During Dredging Operations

Dump barges and scows shall not be permitted to overflow during dredging operations.

3.1.4.2 Overflow During Transport

During transport to the disposal site, water and dredging material shall not be permitted to overflow or spill out of barges of dump scows.

Containers having more than 10% loss in either draft or volume while transporting material to the disposal site shall not be further utilized until repaired. Monitoring of overflow time and leakage shall be as specified in Section 01 45 04.00 10 CONTRACTOR QUALITY CONTROL, and Section 02 32 90 SCOW SILENT INSPECTOR SYSTEM. If the draft sensors become inoperable, dump scows shall be measured at the four corners on the outside of the scow for displacement prior to dumping at the disposal site. For all barges, Contractor shall furnish certified ullage charts and shall furnish for each barge a load report shown in

ATTACHMENT B-2.

3.2 INSPECTION

3.2.1 Inspection Requirements

The presence of a Quality Assurance Representative shall not relieve the

Contractor of responsibility for the 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 Quality

Assurance Representative, 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. However, the Contractor will not be required to furnish such facilities for the surveys prescribed in the Section 35 20 23, paragraph FINAL EXAMINATION AND

ACCEPTANCE.

(b) To furnish, on the request of the Contracting Officer or any Quality

Assurance Representative, 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 dumping grounds.

SECTION 35 20 23 PAGE 7

3.2.2 Noncompliance

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.

3.3 ORDER OF WORK

The order of work shall be the dredging of each shoal in the order as listed below:

PHASE A

(1) Shoal 5 (Hog Island Reach)

(2) Shoal 3 (Custom House Reach)

(3) Shoal 4 (Lower Town Creek Turning Basin)

(4) Shoal 8 (Upper Wando River)

(5) Shoal 11 (Middle Wando River)

(6) Shoal 7 (Lower Wando River)

PHASE B

(7) Shoal 2 (Lower Town Creek Reach)

(8) Shoal 6 (Drum Island Reach)

(9) Shoal 9 (Wando Turning Basin)

(10) Shoal 10 (Myers Bend)

(11) Shoal 1 (Tidewater Reach)

3.4 PLANT

3.4.1 General

The Contractor agrees to keep on the job sufficient plant to meet the requirements of the work. The plant shall be in satisfactory operating condition and capable of safely and efficiently performing the work as set forth in these specifications. Inspection of equipment listed in "Plant and Equipment Schedule" shall be made prior to commencement of work in order to determine if it is satisfactory so as to meet the requirements of work. The plant shall be subject to inspection by the Contracting Officer and the U.S. Coast Guard at all times. The plant listed on the Plant and Equipment Schedule, as specified in Section 0100, Contract Clause 52.209-4006 PLANT AND EQUIPMENT SCHEDULE and Section 0800, Contract Clause 52.203-4002 PLANT AND EQUIPMENT SCHEDULE- LIST, is the minimum which the Contractor agrees to place and maintain on the job unless otherwise determined by the Contracting Officer, and its listing thereon is not to be construed as an agreement on the part of the Government that it is adequate for the performance of the work.

3.4.1.1 Equipment and Machinery

A complete listing of all dredging plant and machinery to be used in the work, including booster pumps, barges, skiffs, and other related equipment, shall be submitted with the Plant and Equipment Schedule prior to beginning work. The listing shall include manufacturer and year of manufacture, operational capacities, safety features, operating and licensing requirements for operators, and a description of where and how the item of equipment or plant is to be employed in the work.

3.4.1.2 Capacity of Plant

No reduction in the capacity of the plant employed on the work shall be made except by written permission of the Contracting Officer. The

SECTION 35 20 23 PAGE 8

measure of the "capacity of the plant" shall be its actual performance on the work to which these specifications apply.

3.4.1.3 Walkways and Guardrails

All floating plant and pipelines used as access ways or working platforms shall be equipped with walkways and guardrails conforming to Corps of Engineers Manual EM 385-1-1 and meet OSHA requirements for worker safety.

3.4.2 Pipelines

3.4.2.1 Condition of Pipelines

The Contractor will be responsible to see that pipelines are properly maintained during this contract. All pipelines for hydraulic machines must be kept in good condition at all times and any leaks or breaks along their length must be promptly and properly repaired. The Contractor will comply with lighting of the floating pipeline in accordance with EM 385-1-1 AND U.S. Coast Guard Regulations.

3.4.2.2 Submerged Pipeline

3.4.2.2.1 Placement of Pipeline

Submerged pipeline shall rest on the channel bottom where a pipeline crosses a navigation channel and while submerged; the top of the pipeline and any anchor securing the pipe shall be no higher than the required project depth for the navigation channel in which the pipe is placed.

3.4.2.2.2 Buoyant or Semi-buoyant Pipeline

Whenever buoyant or semi-buoyant pipeline is used, the dredge operator will assure that the pipeline remains fully submerged and on the bottom;

whenever it is necessary to raise the pipeline, proper clearances shall be made and maintained and the entire length of the pipeline will be adequately marked.

3.4.2.2.3 Marking the Location of the Pipeline

Submerged pipeline shall be marked in accordance with local USCG requirements and an approved by the Government Designated Authority

(GDA).

(a) Unless otherwise specified by the USCG, submerged pipelines are considered to require special marks and shall have a USCG approved flashing yellow light.

(b) Indicators, such as signs or buoys that state “DANGER SUBMERGED

PIPELINE” will be placed at the beginning and end of the pipeline.

In addition, indicators are required beginning in areas which reduce the charted depth by more than 10 percent and, as a minimum, every 1000 ft. (304.8 m) to clearly warn of the pipeline length and course.

(c) If barges or other vessels are used to anchor the beginning and/or end of the submerged pipeline, they shall be lighted in accordance with 33 CFR 88.13.

(d) Within a navigation channel, each end of the pipeline shall be identified with a regulatory marker buoy.

SECTION 35 20 23 PAGE 9

(e) Lengths of submerged pipeline located outside of the navigation channel, which reduce the charted depth by more than 10 percent, will be identified with high visibility buoys marked with 360 degree visibility retro-reflective tape, such as orange neoprene buoys, placed at an interval not to exceed 500 ft. (152.4 m) to clearly show the pipeline length and course.

3.4.2.2.4 Inspections

Routine inspections of the submerged pipe shall be conducted to ensure anchorage.

3.4.2.2.5 Removal of Related Equipment

All anchors and related material shall be removed when the submerged pipe is removed.

3.4.2.3 Floating Pipeline

Floating pipeline is any pipeline which is not anchored on the channel bottom. Floating pipeline, to include rubber discharge hoses, shall be clearly marked.

3.4.2.4 Location of Pipelines

Pipelines shall not be permitted to fluctuate between the water surface and the channel bottom or lie partially submerged.

3.4.3 Placement of Lights

Dredge pipelines that are floating or supported shall display lights at night and in periods of restricted visibility in accordance with U.S.

coast Guard regulations and 33 CFR 88.15.

3.4.4 Buoys

All marker buoys shall be painted yellow and display the same yellow flashing light as required for floating or supported dredge pipelines meeting the requirements of paragraph "Placement of Lights" above.

(1) Buoys used to anchor booster pumps

(2) Buoys used to anchor or mark stored equipment i.e. (barges, pipeline etc.)

(3) Buoys used to mark or anchor dredge pipelines and this includes floating and submerged pipeline leading to disposal areas.

(4) Any other buoys the U.S. Coast Guard or Contracting Officer requires to insure a safe harbor free from hazards to navigation must be marked and display yellow flashing lights meeting the requirements stated in paragraph "Placement of Lights" above.

3.4.5 Submerged Pipeline or Fittings

All submerged pipeline or fittings with less than six (6) feet of clearance between the top of the pipeline and mean low water will:

(1) be marked with the same type of light meeting the requirements of paragraph "Placement of Lights" above.

(2) be spaced approximately one hundred (100) feet apart

3.4.6 Lights, Lighted Buoys and Dredging Aids Markers

SECTION 35 20 23 PAGE 10

All lights, lighted buoys and dredging aids markers must be maintained, operable and on station at all times to insure a safe harbor. The placement, markings and lighting shall meet all US Coast Guard Regulations, EM 385-1-1 and the Special Requirements found in Section 35 20 23, paragraph PLANT.

3.4.7 Noncompliance

The Contracting Officer will notify the Contractor in writing of any noncompliance with the foregoing provisions. Such notice, when delivered to the Contractor or his authorized representative at the site of the work, shall be deemed sufficient for the purpose. Within 24 hours after receipt of such notice, the Contractor shall mail, or personally deliver to the Contracting Officer, a complete proposal of the prompt correction of the noncompliance. The Contracting Officer will review the proposal and return it to the Contractor approved, subject to such changes or conditions as he finds necessary to assure correction of noncompliance.

Immediately upon receipt of such approval, the Contractor shall begin the corrective work and shall carry it to completion. If the Contractor fails or refuses to submit his proposal or to proceed with the corrective work, the Contracting Officer may suspend all or any part of the work until satisfactory corrective action has been taken. No part of the time lost due to any such suspension shall be made the subject of a claim for extension of time nor for excess costs or damages by the Contractor. If he so elects, the Contracting Officer may cause the corrective work to be accomplished by others, in which event the cost thereof shall be chargeable against moneys otherwise due the Contractor from the Government.

3.4.8 Plant Removal

Upon completion of the work, the Contractor shall promptly remove all plant, including all pipeline, ranges, buoys, piles, and other markers or obstructions.

3.5 SIGNAL LIGHTS (DAEN PRP ON-TIME 12 JUL 1984)

The Contractor shall display signal lights and conduct his 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 of 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.

3.6 NAVIGATION AIDS AND DREDGING AIDS

3.6.1 Relocation of Navigation Aids for Dredging

The U. S. Coast Guard (USCG) requires notification sixty (60) days in advance to remove or relocate any navigation aids to facilitate dredging operations. Due to time constraints the Government will notify the USCG in advance of an estimated time and location that dredging operations will be accomplished. However, after award and prior to commencement of dredging it is the responsibility of the Contractor to coordinate with the USCG for the actual removal or relocation of any navigation aids

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within or near the areas to be dredged. The Contractor will also notify the Contracting Officer in advance of the time and location of the aids that will require relocation. The Contractor shall coordinate the removal or relocation of navigation aids with the following:

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Commander, 7th Coast Guard District (OAN) Brickell Plaza Federal Bldg., Room 406 909 S.E. 1st Avenue Miami, Florida 33131-3050 ATTN: Chief of Planning and Marine Information Phone: (305) 350-5621

Commander - US Coast Guard Sector Charleston 196 Tradd Street Charleston, South Carolina 29401 ATTN: Aids to Navigation Officer

3.6.2 Aids to Navigation within the Dredging Areas

The Contractor shall be responsible for any damage to aids to navigation within the dredging areas or areas adjacent thereto caused by his operations.

3.7 COMMUNICATIONS

The Contractor will be required to furnish, maintain, and operate one FM narrow-band radio transmitter-receiver with a capacity of not less than

(1) watt, equipped for operating on maritime channels 13 and/or 16 at

156.65 MHz. This frequency shall be used for communications with passing vessels, harbor pilots, and bridge operators and has been approved by the Federal Communications Commission for this purpose. It is not required that his frequency be disabled after termination of the contract. Contractor will be required to maintain a Contractor owned cellular phone for communication with Corps of Engineers personnel.

3.8 AUTOMATIC IDENTIFICATION SYSTEM (AIS).

The Contractor is required to have the Automatic Identification System (AIS). The Contractor shall have AIS transponders on all dredges, scows, and tugs at all times when working in Charleston Harbor. The AIS provides a means for ships to electronically exchange ship data including: identification, position, course, and speed with other nearby ships and VTS stations. AIS is intended to assist the vessel's watch standing officers and allow maritime authorities to track and monitor vessel movements.

3.9 DISPOSAL OF EXCAVATED MATERIAL

3.9.1 Ocean Dredged Material Disposal Site (ODMDS)

Disposal of excavated material shall be placed in the Charleston Ocean Dredged Material Disposal Site (ODMDS) within the designated disposal zone shown on contract drawings and in accordance with these specifications.

3.9.2 Surface Transport of Dredged Material

Transportation of dredged material by hopper or scows to the disposal area will be allowed for this contract. All disposal vessels shall be equipped with Silent Inspector (SI) System. See section SCOW SILENT INSPECTOR SYSTEM. All hopper and scows shall be kept in good condition.

Failure to repair leaks will result in suspension of dredging. If suspension occurs, dredging will not be allowed to resume until the Contractor has promptly repaired the scow to the satisfaction of the Contracting Officer. The doors on the dredge material scows or hopper dredges shall be closed before leaving the Ocean Dredge Material Disposal Site (ODMDS) to insure that all disposal materials are released within the authorized area and that no trails of sediment are left outside the ODMDS.

SECTION 35 20 23 PAGE 13

3.9.2.1 Emergency Dumps

If a vessel experiences an emergency situation which causes a dumping of material outside of the designated disposal areas, the Contractor shall verbally notify the Contracting officer no later than the next work day.

The Contractor must submit an Emergency Dump Statement in writing within two (2) days after the emergency dump occurred. The statement shall detail time of dump, location of dump, and the reason the dump occurred.

Material that is misplaced due to an emergency dump situation is subject to removal by the Contractor at his own expense upon the request of the Contracting Officer.

3.9.3 Location of Disposal of Dredged Material

The Contractor shall dispose of all dredged material in the Government furnished Ocean Dredged Material Disposal Site (ODMDS)as shown on the contract drawings. The dredged material shall be dumped within 100 feet either side of the dump lines shown on the drawings, beginning at Line 3-4, until the bottom elevation of the dump site has been altered such that no area along this line is above elevation -25 feet MLLW (Mean Lower Low Water). When the area along Line 3-4 is no longer able to receive disposal material, Line 5-6, immediately to the east, shall be used until the fill along it reaches an elevation of -25 feet MLLW, then the next line to the east, Line 7-8 shall be used, etc. No material shall be placed above elevation -25 feet MLLW in the disposal area. The dredge material scows or hopper dredges (loaded or unloaded) shall never use routes that cross known live bottom areas. Currently this includes any area outside of the ODMDS and south of a line from the center of the ODMDS to the seaward tip of the south jetty.

3.9.4 Disposal Area Maps

The Contractor shall prepare a series of maps at a scale that shall clearly show the individual dumps, labeled by the same number that is used to record the dump in the daily log. Maps shall be labeled as map numbers in a series, and lowest and highest dump numbers that appear on each map shall be shown near the map title. The Contractor may continue to use the same map until the density of dumps makes it difficult to identify the individual dumps by number. A cumulative summary map or maps of all dumps for each day (24 hour period) shall be submitted to the Contracting Officer's Representative daily by electronic mail (E-mail) and included in the daily "Construction Quality Control Report".

If permitted by the Contracting Officer, a CD-ROM may be used instead of E-mail.

3.9.5 Report

At the end of the contract, the Contractor shall provide by CD-ROM two digital copies that contain all of the daily dump logs, disposal area maps and the Consolidated Report at the end of the job. One digital copy shall be submitted to:

U.S. Army Corps of Engineers ATTN: Phil Wolf, Navigation Section 69A Hagood Ave., Charleston SC 29403 Phone: (843) 329-8069 Fax (843) 329-2330 Email: Philip.M.Wolf@usace.army.mil

3.9.6 Location of Pipeline Outfall Points (Pipeline Only)

Omitted

SECTION 35 20 23 PAGE 14

3.10 OCEAN DISPOSAL VERIFICATION

3.10.1 Silent Inspector

This Contract requires the use of the Silent Inspector (SI) system for monitoring dredges using scows. See section: SILENT INSPECTOR- 02 32 90.

3.10.2 Verification Spreadsheet

The Contractor shall maintain an electronic spreadsheet data record of the ocean dumping project information. The spreadsheet shall be prepared in a form readily exportable to Microsoft Excel 2003 and shall be similar (cumulative loads on one spreadsheet) to the Sample Form provided in Attachment B-3 (Attachment: Chs_L_Harbor_Log.xls):

1. Sequential Load No.

2. Date (month/date/year)

3. Vessel Name

4. Start Dump Time (24 hour clock)

5. Start Dump Position (X, SC State Plane)

6. Start Dump Position (Y, SC State Plane)

7. Compass Heading at Start of Dump

8. End Dump Time (24 hour Clock)

9. End Dump Position (X, SC State Plane) 10.End Dump Position (Y, SC State Plane) 11.Estimated Load (CY) 12.Dredging Range or Location 13.Type of Material

This spreadsheet shall be updated and submitted weekly in digital (electronic file) format to the Contracting Officer or more frequently as requested by the Contracting Officer. In addition, digital copies of the Disposal Monitoring data shall be submitted weekly to:

U.S. Army Corps of Engineers ATTN: Phil Wolf, Navigation Section 69A Hagood Ave., Charleston SC 29403 Phone: (843) 329-8069 Fax (843) 329-2331 Email: Philip.M.Wolf@usace.army.mil

3.11 MISPLACED MATERIAL

3.11.1 General

Any material that is deposited other than in places designated or approved by the Contracting Officer will not be paid for. Should the Contractor deposit any material outside the designated disposal areas approved by the Contracting Officer, the Contractor shall give immediate notification of the location of the misplaced material and when required, mark or buoy this location. If in the opinion of the Contracting Officer, this misplaced material requires removal, the Contractor shall be required to remove the misplaced material immediately and deposit it in an area designated by the Contracting Officer at no additional cost to the Government.

3.11.2 Misplaced Material

Any material that is deposited or allowed to flow elsewhere than in places designated or approved by the Contracting Officer will be considered as misplaced material. If, in the opinion of the Contracting Officer, this misplaced material will in any way be a hazard to navigation, to normal activities of the public, or to the environment, the Contractor shall remove such misplaced material and deposit it where directed at the Contractor's expense. Misplaced material includes dredged material deposited outside the specified new Ocean Dredged Material Disposal Site (ODMDS) disposal zone and any dredged material

SECTION 35 20 23 PAGE 15

mounded higher than elevation -25 feet MLLW within the ODMDS disposal zone. Material placed without the specified Silent Inspector (SI) system monitoring data, shall be considered misplaced materials under this contract.

3.12 SURVEILLANCE OF OCEAN DISPOSAL

3.12.1 Responsibility

Under the Marine Protection, Research and Sanctuary Act of 1972, the Environmental Protection Agency's Final Ocean Dumping Regulation and Criteria (Federal Register, Vol. 38, No. 198, dated 15 October 1972), the U.S. Coast Guard has the responsibility for the surveillance of ocean dumping.

3.12.2 Coast Guard Notification

The Contractor shall notify the local Coast Guard Captain of the Port, at least five days prior to the first ocean disposal. The notification will be by certified mail with a copy to the Contracting Officer. The following information shall be included in the notification letter.

(1) Project Designation, Corps of Engineer's contract number and name, and Contractor's address and telephone number.

(2) Port of departure

(3) Location of Ocean Disposal Area

(4) Quantity of material to be deposited in ocean

(5) Schedule for ocean disposal, giving date and time proposed for first ocean disposal

(6) Name of vessel or towboat and barge

3.12.3 Quarters and Meals

The Coast Guard may require Coast Guard personnel to be on board the tow or dump vessel during complete cycles of loading, travel and disposal in the ocean. The Coast Guard personnel will monitor the disposal of the material and obtain any necessary dredged material samples. Meals as normally provided to the crew will be served to the Coast Guard personnel on board. Likewise, quarters will be provided for Coast Guard personnel if the dump operation requires two or more continuous shifts.

Any charge for these meals and quarters will be paid by the Coast Guard.

3.12.4 Documentation

Any Coast Guard direction concerning the Contractor's method of operation will be documented and channeled through the Contracting Officer or his authorized representative. This information may be included in the Daily Quality Control or any other method deemed appropriate by the Contractor.

3.13 DATUM AND BENCH MARKS

The plane of reference as used in these specifications is that determined by benchmarks shown on the contract drawings. Benchmark information will be provided upon request by the Contractor to the Contracting Officer. The reference datum for surveys is the MLLW Datum utilizing NAVD88. The POC for information on Government Tide Gauges is Matt Foss, Chief of Survey Section 843-329-8206.

3.14 MISPLACED MATERIAL (JAN 87)

Should the Contractor, during the progress of the work, lose, dump, throw overboard, sink, or misplace any material, plant, machinery, or appliance, which in the opinion of the Contracting Officer may be dangerous to or obstruct navigation, the Contractor shall recover and remove the same with the utmost dispatch. The Contractor shall give immediate notice, with description and location of such obstructions, to the Contracting Officer or Quality Assurance Representative, and when

SECTION 35 20 23 PAGE 16

required shall mark or buoy such obstructions, until the same are removed. Should he refuse, neglect, or delay compliance with the above requirements, such obstructions may be removed by the Contracting Officer, and the cost of such removal may be deducted from any money due or to become due the Contractor, or may be recovered under his bond. The liability of the Contractor for the removal of a vessel wrecked or sunk without fault or negligence shall be limited to that provided in Sections 15,19, and 20 of the River and Harbor Act of March 3, 1899 (33 U.S. C. 410 et seq.).

3.15 MEASUREMENT AND PAYMENT

3.15.1 Measurement

The required amount of material removed and placed by dredging according to contract specifications will be measured and paid for by the cubic yard in situ. The volume for payment will be computed between the original bottom surface as shown by soundings from the last survey made before dredging and the required dredging template plus allowable overdepth, less any material remaining above and within the template as determined by the soundings from a survey made within 14 days (weather permitting) after dredging in the Acceptance Section has been completed.

This includes the area within the limits of the allowable overdepth and side slopes described in Paragraph OVERDEPTH AND SIDE SLOPES, less any deductions that may be otherwise required by these specifications.

3.15.2 Adjacent Acceptance Sections

When two shoals are adjacent to each other and share a common end area

(cross section), the common cross section taken to compute the quantity of material available before dredging takes place in the first shoal will be used to compute the quantity of material available for the second adjacent shoal. This cross section will be used in lieu of the cross section taken after dredging occurred in the first shoal.

3.15.3 Surveys

The maps and/or drawings already prepared, as stated in Section 00800, contract clause CONTRACT DRAWINGS, MAPS AND SPECIFICATIONS, are believed to represent accurately conditions existing at the time surveyed but the depths shown thereon will be verified and corrected by before dredging sounding taken of the entire area to be dredged under this contract. The first acceptance section will be sounded commencing not less than 30 days after Notice to Proceed has been given the Contractor or sooner if requested in writing by the Contractor. The before dredging surveys for the remaining acceptance sections will be sounded commencing not more than 14 days prior to the arrival of the Contractor on the section to be dredged. The Contractor shall notify the Government a minimum of ten days prior to estimated time of arrival on each section to allow time for before dredging surveys to be conducted. The estimated time of arrival shall be determined by the Contractor. The request for acceptance surveys on any shoal shall be given at least five (5) days in advance of the estimated time of completion. The estimated date of completion shall be determined by the Contractor. The request for all Government surveys shall be in writing by the Contractor and shall include the shoal number(s), stationing, and the estimated date of arrival on or departure from the shoal(s) to be surveyed. Determination of quantities removed and the deductions made therefrom to determine quantities by place measurement to be paid in the area specified after having once been made, will not be reopened except on evidence of collusion, fraud, or obvious error.

SECTION 35 20 23 PAGE 17

3.15.3.1 Survey Equipment

The soundings for dredging surveys under this contract will be taken by the Government with Innerspace Depth Recorder operating on frequency band 200 kHz.

3.15.3.2 Dispute of Surveys Performed by Government

In the event that the Contractor disputes the accuracy of any survey performed by the Government, the Contractor shall immediately notify the Contracting Officer or the Contracting Officer’s Authorized Representative, in writing, concerning the nature of the dispute. If the dispute cannot be resolved immediately, the Contractor shall immediately resurvey the shoal, or all remaining area that has not been dredged or unaffected portions of the shoal with a Government representative onboard the Contractor’s survey boat. At the conclusion of the survey, the Contractor shall provide copies of all raw and edited data files for that shoal. The files shall be in Hypack format. The Contractor shall submit the following information (as a minimum) in support of his survey data:

(1) Edited survey data in X-Y-Z format; coordinates shall be SC

State Plane Coordinates, NAD 1983.

(2) Method of horizontal positioning.

(3) Date, time, and stage of tide.

(4) Water surface conditions.

(5) Plan showing the edited depth soundings.

(6) Plotted cross sections of the latest Contractor survey compared with the Government survey. The individual cross sections shall be provided at a scale of 1 inch equals 10 feet horizontal and 1 inch equals 10 feet vertical.

(7) Plan of channel showing areas that were worked by the dredge.

(8) Speed of sound through the water column in area of survey and method used to determine the speed of sound.

(9) Draft of survey boat and method used to determine the draft.

(10) A table listing all current status of all calibrations and checks required by EM 1110-2-1003, HYDROGRAPHIC SURVEYING MANUAL, and the date equipment was set up and last checked.

The Government will evaluate the data provided by the Contractor and make a determination on that basis.

3.15.4 Payments

Monthly partial payments will be based on approximate quantities estimated by the construction representative using information taken from the surveys as described in Section 00800, contract clauses

QUANTITY SURVEYS.

3.16 FINAL EXAMINATION AND ACCEPTANCE (1965 APR OCE)

3.16.1 Examination

Dredging soundings will be taken within 14 days (weather permitting) after the completion of an acceptance section as listed below or any section thereof 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 soundings or by sweepings, 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 the same by dredging at the contract rate of dredging, but if the bottom is soft and the shoal areas are small and form no material obstruction

SECTION 35 20 23 PAGE 18

to navigation, the removal of such shoal may be waived at the discretion of the Contracting Officer. 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 soundings 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 $3,300.00 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 operations. The plant and method used for third and subsequent surveys will duplicate that used in previous surveys to the fullest possible extent. The request for acceptance surveys on any section shall be given at least five (5) days in advance of the estimated date of completion. The estimated date of completion shall be determined by the Contractor. The request for all Government surveys shall be submitted in writing by the Contractor and shall include the shoal number(s), stationing, and the expected date of completion.

3.16.2 Acceptance

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

3.16.3 Acceptance of Work

For the purpose of acceptance, each shoal shall comprise an acceptance section.

3.17 ACCOMMODATIONS AND MEALS FOR INSPECTORS (1965 APR OCE)

3.17.1 Office

The Contractor shall furnish regularly to Quality Assurance

Representatives on board the dredge or other craft upon which they are employed a suitable separate room for office purposes. The room shall be fully equipped and maintained to the satisfaction of the Contracting Officer; it shall be properly heated, ventilated, and lighted, and shall have a desk which can be locked and chair for each Quality Assurance Representative, and washing conveniences. The entire cost to the Contractor for furnishing, equipping, and maintaining the foregoing accommodations shall be included in the contract price. If the Contractor fails to meet these requirements, the facilities referred to above will be secured by the Contracting Officer, and the cost thereof will be deducted from payments to the Contractor.

3.17.2 Subsistence

If the Contractor maintains on this work an establishment for the subsistence of his own employees, he shall when required furnish to Quality Assurance Representatives employed on the work, and to all Government agents who may visit the work on official business, meals of a quality satisfactory to the Contracting Officer. The meals furnished will be paid for by the Government at a rate of $1.75 per person for each meal.

-- End of Section 35 20 23--