Specifications Section 35 20 23_Dredging_REVa.pdf

POST 45 CHARLESTON LOWER HARBOR W912HP20B0003

TO HUGH LEATHERMAN TERMINAL

MAINTENANCE AND NEW WORK DREDGING

SECTION 35 20 23 PAGE 1

SECTION 35 20 23

DREDGING

PART 1 GENERAL

1.1. SUMMARY

1.2. REFERENCES

1.3. DEFINITIONS

1.3.1. Required Dredging Prism

1.3.2. Allowable Overdepth Prism

1.3.3. Side Slopes

1.3.4. Excessive Dredging

1.3.5. Acceptance Section

1.3.6. Floating Pipeline

1.3.7. Submerged Pipeline

1.3.8. Authorized Release Zone Limit

1.4. MEASUREMENT AND PAYMENT

1.4.1. Continuity of Work

1.4.2. Work Covered By Contract Price

1.4.3. Estimated Quantities

1.4.4. Variations In Estimated Quantity – Dredging

1.4.5. Shoaling

1.5. SUBMITTALS

1.6. CHARACTER OF MATERIALS

1.6.1. Maintenance

1.6.2. New Work

1.6.3. Historical Geotechnical Reports

1.6.4. Debris

1.6.5. Unexploded Ordnance

1.7. CONSOLIDATED REPORT

PART 2 PRODUCTS (Not Applicable)

PART 3 EXECUTION

3.1. ORDER OF WORK

3.2. INSPECTION

3.2.1. Inspection Requirements

3.2.2. Noncompliance

3.3. PLANT

3.3.1. Equipment and Machinery

3.3.1.1. Capacity of Plant

3.3.1.2. Walkways and Guardrails

3.3.1.3. Signal Lights

3.3.1.4. Communications

3.3.1.5. Automatic Identification System

SECTION 35 20 23 PAGE 2

3.3.2. Pipelines

3.3.2.1. Submerged Pipeline

3.3.2.2. Floating Pipeline

3.3.2.3. Marking the Location of the Pipeline

3.3.3. Buoys

3.3.3.1. Lights, Lighted Buoys and Dredging Aids Markers

3.3.4. Noncompliance

3.3.5. Plant Removal

3.4. NAVIGATION AIDS AND DREDGING AIDS

3.4.1. Relocation of Navigation Aids for Dredging

3.4.2. Aids to Navigation within the Dredging Areas

3.5. MISPLACED MATERIAL

3.5.1. Dredged Material

3.5.2. Equipment

3.6. PLACEMENT OF EXCAVATED MATERIAL IN UPLAND PLACEMENT AREA

3.6.1. Use and Operation of Placement Area

3.6.2. Discharge Points and Discharge lines

3.6.3. Use of Spillways

3.6.4. Stoplogs

3.6.5. Monitoring of Dikes and Spillways

3.6.6. Monitoring Discharges from Spillways

3.6.7. Maintenance of Upland Placement Area

3.6.8. Existing Drainage Ditches

3.6.9. New Drainage Ditches

3.6.10. Maintenance and Repair of Dikes

3.6.11. Maintenance and Repair of Spillways

3.6.12. Drainage of Surface Water

3.6.13. Completion Inspection of Placement Areas

3.7. PLACEMENT OF EXCAVATED MATERIAL IN OCEAN DREDGED MATERIAL DISPOSAL SITE

3.7.1. Surface Transport of Dredged Material

3.7.2. Emergency Dumps

3.7.3. Avoidance Areas

3.7.4. Placement of Dredged Material

3.7.5. Overflow Time

3.7.5.1. Overflow During Dredging Operations

3.7.5.2. Overflow During Transport

3.8. OCEAN DISPOSAL VERIFICATION

3.8.1. Dredge Quality Management

3.8.2. Verification Spreadsheet

3.8.3. Disposal Area Maps

3.8.4. Dump Logs

3.8.5. Report

3.9. SURVEILLANCE OF OCEAN DISPOSAL

3.9.1. Responsibility

3.9.2. Coast Guard Notification

3.9.3. Quarters and Meals

3.9.4. Documentation

SECTION 35 20 23 PAGE 3

3.10. SURVEY

3.10.1. Quantity Surveys

3.10.1.1. Survey Specifications

3.10.1.2. Horizontal Positioning of Surveys

3.10.1.3. Vertical Positioning of Surveys

3.10.1.4. Government Equipment

3.10.1.5. Datum and Bench Marks

3.10.1.5.1. Horizontal Datum

3.10.1.5.2. Vertical Datum

3.10.1.6. Dispute of Surveys Performed by Government

3.11. EXAMINATION AND ACCEPTANCE

3.11.1. Final Examination of Work

3.11.2. Acceptance of Work

3.11.2.1. Maintenance

3.11.2.2. New Work

3.11.2.3. Bed Leveling

3.11.2.4. Bed Leveling – Reporting and Documenting

3.12. ACCOMMODATIONS, MEALS, AND TRANSPORTATION FOR GOVERNMENT PERSONNEL

3.12.1. Office

3.12.2. Subsistence

3.12.3. Transportation

SECTION 35 20 23 PAGE 4

PART 1 GENERAL

1.1. SUMMARY

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.

1.2. REFERENCES

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 385-1-1 Safety and Health Requirements Manual

EM 1110-2-1003 Hydrographic Surveying Manual

1.3. DEFINITIONS

1.3.1. Required Dredging Prism

The dredging prism shall be defined as the area down to the required depth and to the associated side slopes as specified on the contract drawings. The dredging prism does not include the allowable overdepth in the channel or allowable overdepth in the associated side slopes.

1.3.2. Allowable Overdepth Prism

To cover inaccuracies of the dredging process, material actually removed from within the specific areas to be dredged below the required dredging prism to a depth of not more than 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 Paragraph “Variations In Estimated Quantity – Dredging”.

1.3.3. Side Slopes

Dredging of side slopes is required for acceptance of new work only. Material actually removed from the required side slope section shown on the contract drawings will be computed and paid for at the dredging unit cost per cubic yard for that acceptance section. For the purpose of dredging, the side slopes constitute a design criteria for new work dredging. 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.

1.3.4. Excessive Dredging

Material taken from beyond the limits as extended in the provisions of Paragraphs “Allowable Overdepth Prism” 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 acceptance sections performed in accordance with Subsection EXAMINATION AND ACCEPTANCE or Paragraph “Shoaling” and as applicable and as further set forth under Subsection MEASUREMENT AND PAYMENT.

1.3.5. Acceptance Section

For the purpose of acceptance, each acceptance section is shown on the

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contract drawings. Acceptance sections may be modified as described in Paragraph “Acceptance of Work”.

1.3.6. Floating Pipeline

Floating pipeline is any pipeline which is not anchored on the channel bottom.

1.3.7. Submerged Pipeline

Submerged pipeline is any pipeline which is anchored on the channel bottom.

1.3.8. Authorized Release Zone Limit

The Authorized Release Zone Limit is the area within the ODMDS that is designated for material placement. Equipment used to transport dredged material may not open doors to release material until inside of this zone.

1.4. MEASUREMENT AND PAYMENT

The Contractor shall dredge each acceptance section to the required depths as indicated on the contract drawings. The required dredging prism for each Contract Line Item shall be considered for purposes of determining any variation in quantity. See Paragraph “Variations In Estimated Quantity – Dredging”.

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 based on before and after dredge surveys performed by the Government.

The volume computation method used will be determined according to the most accurate method for each acceptance section and the type of survey performed and may include: the TIN to Channel Single TIN method for before dredge (BD) volumes and the TIN to Channel Dual TIN method for after dredge (AD) volumes, the Philadelphia Pre-dredge Side Slope Non-contour method for BD volumes and the Philadelphia Post-dredge Side Slope Non-contour method for AD volumes, or the Cross Sections and Volumes Philadelphia Predredge method for BD volumes and the Cross Sections and Volumes Philadelphia Postdredge method for AD volumes. After dredge volumes will be calculated from a survey made within five (5) days (weather permitting) after dredging in the Acceptance Section that has been completed. This includes the area within the limits of the allowable overdepth and side slopes described in Paragraph “Allowable Overdepth Prism” and Paragraph “Side Slopes”, less any deductions that may be otherwise required by these specifications. Payment will be made using the after dredge method based on the before dredge survey and after dredge survey for each acceptance section. The net required and net overdepth volumes will be used for payment.

All volume calculations will be computed using HYPACK software. Calculations will be made using survey data collected in accordance with subparagraph “Survey Specifications”. Multi-beam data will be binned to a 3-foot by 3-foot matrix using the average soundings within each cell. All raw survey data and data used for volume computations will be available to the Contractor upon request.

Payment items for the work of this contract will be made as listed in the Bidding Schedule and described below. All costs for items of work, which are not specifically mentioned or are incidental to completion of the work, are to be listed in a particular lump sum or unit price payment item that is most

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closely associated with the work involved. The lump sum price and payment made for each item listed shall constitute full compensation for furnishing all plant, labor, materials, and equipment, and performing any associated Contractor quality control, environmental protection, meeting safety requirements, testing and reports, and for performing all work required for which separate payment is not otherwise provided.

Progress payments shall be made monthly in accordance with the contract clause PAYMENTS UNDER FIXED-PRICE CONSTRUCTION CONTRACTS. Progress payments shall be based on a mutually agreeable percentage of completed work, as described in Paragraph “Work Covered By Contract Price.”

Monthly progress payments will be based on approximate quantities estimated and agreed on with the construction representative using information taken from the surveys as described in Subsection SURVEY.

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, and as modified by Subsection EXAMINATION AND ACCEPTANCE and Paragraph “Shoaling”.

All work shall be done in accordance with the contract at the contract price or prices, except as may be affected by Paragraph “Variations In Estimated Quantity – Dredging”.

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.

1.4.1. Continuity of Work

Final payment for and formal acceptance of Acceptance Sections will not be rendered until the Acceptance Section is excavated to the full depth and extents required by the contract. If the Contractor requests, and the Government approves, to adjust the extents of an Acceptance Section, in accordance with Paragraph “Acceptance of Work,” and then is unable to complete that Acceptance Section prior to the planned departure of plant, then the Contractor shall be responsible for the removal of any additional material that may shoal, accrete, or otherwise be deposited in that Section prior to acceptance by the Government, at no additional costs to the Government. See provisions in Subparagraph “Shoaling.” Progress Payments will be made in accordance with SECTION 35 20 23, Subsection MEASUREMENT AND

PAYMENT.

1.4.2. Work Covered By Contract Price

ITEM 0001, MOBILIZATION AND DEMOBILIZATION - MAINTENANCE AND NEW WORK

DREDGING IN CHARLESTON LOWER HARBOR AND COOPER RIVER ACCEPTANCE SECTIONS 1 TO

9, shall include all costs connected with the mobilization and demobilization of all dredging plant and equipment required to complete the work to and from the project site. Sixty percent (60%) of this CLIN will be paid when scheduled mobilization work has been completed, and the remaining forty percent (40%) will be paid when scheduled demobilization has been completed.

If incremental or multiple mobilizations and demobilizations are anticipated, then the line item price shall be spread proportionately across the various mobilization or demobilization events as detailed in the accepted project schedule. The percentage assigned to each event will be paid after completion

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of the event. The sum of all the mobilizations shall not exceed sixty percent (60%) of CLIN 0001, and the sum of all the demobilizations shall not exceed forty percent (40%) of CLIN 0001, and the total payment shall not exceed the CLIN 0001 price. All effort associated with moving the plant and equipment within the project site shall be included in the unit price for the Line Item Number being worked and not in the mobilization and demobilization CLIN 0001.

ITEM 0002, DREDGING OF UNCLASSIFIED NEW WORK MATERIAL IN IN CHARLESTON LOWER

HAROR AND COOPER RIVER - ACCEPTANCE SECTION 1 (UPLAND/ODMDS PLACEMENT), shall include the cost of removal and placement (UPLAND/ODMDS) of all material and the layout and accomplishment of all work, as specified herein or indicated on the contract drawings. The movement of plant between acceptance sections, as indicated on the contract drawings, shall be included in the unit price.

All shall be paid at the contract price under CLIN 0002. Payment for material removed shall not exceed the Before Dredge quantities for each acceptance section. The contract price per cubic yard for dredging shall be applicable to quantities in any extensions of the dredging limits except as provided in Paragraph “Variations In Estimated Quantity – Dredging”. Calculated volumes for cubic yardage will be determined according to Subsection SURVEY for payment purposes. All material removed from the dredging prism, inclusive of design slopes, shall be paid at the unit price for CLIN 0002 regardless of when it is dredged.

ITEM 0003, DREDGING OF UNCLASSIFIED NEW WORK MATERIAL IN IN CHARLESTON LOWER

HAROR AND COOPER RIVER - ACCEPTANCE SECTION 2 (ODMDS PLACEMENT), shall include the cost of removal and placement (ODMDS) of all material and the layout and accomplishment of all work, as specified herein or indicated on the contract drawings. The movement of plant between acceptance sections, as indicated on the contract drawings, shall be included in the unit price. All shall be paid at the contract price under CLIN 0003. Payment for material removed shall not exceed the Before Dredge quantities for each acceptance section. The contract price per cubic yard for dredging shall be applicable to quantities in any extensions of the dredging limits except as provided in Paragraph “Variations In Estimated Quantity – Dredging”. Calculated volumes for cubic yardage will be determined according to Subsection SURVEY for payment purposes. All material removed from the dredging prism, inclusive of design slopes, shall be paid at the unit price for CLIN 0003 regardless of when it is dredged.

ITEM 0004, DREDGING OF UNCLASSIFIED NEW WORK MATERIAL IN IN CHARLESTON LOWER

HAROR AND COOPER RIVER - ACCEPTANCE SECTION 3 (ODMDS PLACEMENT), shall include the cost of removal and placement (ODMDS) of all material and the layout and accomplishment of all work, as specified herein or indicated on the contract drawings. The movement of plant between acceptance sections, as indicated on the contract drawings, shall be included in the unit price. All shall be paid at the contract price under CLIN 0004. Payment for material removed shall not exceed the Before Dredge quantities for each acceptance section. The contract price per cubic yard for dredging shall be applicable to quantities in any extensions of the dredging limits except as provided in Paragraph “Variations In Estimated Quantity – Dredging”. Calculated volumes for cubic yardage will be determined according to Subsection SURVEY for payment purposes. All material removed from the dredging prism, inclusive of design slopes, shall be paid at the unit price for CLIN 0004 regardless of when it is dredged.

ITEM 0005, DREDGING OF UNCLASSIFIED NEW WORK MATERIAL IN IN CHARLESTON LOWER

HAROR AND COOPER RIVER - ACCEPTANCE SECTION 4 (ODMDS PLACEMENT), shall include the cost of removal and placement (ODMDS) of all material and the

SECTION 35 20 23 PAGE 8

layout and accomplishment of all work, as specified herein or indicated on the contract drawings. The movement of plant between acceptance sections, as indicated on the contract drawings, shall be included in the unit price. All shall be paid at the contract price under CLIN 0005. Payment for material removed shall not exceed the Before Dredge quantities for each acceptance section. The contract price per cubic yard for dredging shall be applicable to quantities in any extensions of the dredging limits except as provided in Paragraph “Variations In Estimated Quantity – Dredging”. Calculated volumes for cubic yardage will be determined according to Subsection SURVEY for payment purposes. All material removed from the dredging prism, inclusive of design slopes, shall be paid at the unit price for CLIN 0005 regardless of when it is dredged.

ITEM 0006, DREDGING OF UNCLASSIFIED NEW WORK MATERIAL IN IN CHARLESTON LOWER

HAROR AND COOPER RIVER - ACCEPTANCE SECTION 5 (ODMDS PLACEMENT), shall include the cost of removal and placement (ODMDS) of all material and the layout and accomplishment of all work, as specified herein or indicated on the contract drawings. The movement of plant between acceptance sections, as indicated on the contract drawings, shall be included in the unit price. All shall be paid at the contract price under CLIN 0006. Payment for material removed shall not exceed the Before Dredge quantities for each acceptance section. The contract price per cubic yard for dredging shall be applicable to quantities in any extensions of the dredging limits except as provided in Paragraph “Variations In Estimated Quantity – Dredging”. Calculated volumes for cubic yardage will be determined according to Subsection SURVEY for payment purposes. All material removed from the dredging prism, inclusive of design slopes, shall be paid at the unit price for CLIN 0006 regardless of when it is dredged.

ITEM 0007, DREDGING OF UNCLASSIFIED MAINTENANCE MATERIAL IN CHARLESTON LOWER

HARBOR AND COOPER RIVER ACCEPTANCE SECTIONS 6, 7, 8, 9 (UPLAND/ODMDS

PLACEMENT), shall include the cost of removal and placement (UPLAND/ODMDS) of all material and the layout and accomplishment of all work, as specified herein or indicated on the contract drawings. The movement of plant between acceptance sections, as indicated on the contract drawings, shall be included in the unit price. All MAINTENANCE materials shall be paid at the contract price under CLIN 0007. Payment for MAINTENANCE material removed shall not exceed the Before Dredge quantities for each acceptance section. The contract price per cubic yard for dredging shall be applicable to quantities in any extensions of the dredging limits except as provided in Paragraph “Variations In Estimated Quantity – Dredging”. Calculated volumes for cubic yardage will be determined according to Subsection SURVEY for payment purposes.

ITEM 0008, DREDGING OF UNCLASSIFIED NEW WORK MATERIAL IN CHARLESTON LOWER

HARBOR AND COOPER RIVER ACCEPTANCE SECTIONS 6 & 7 (UPLAND/ODMDS PLACEMENT),

shall include the cost of removal and (UPLAND/ODMDS) placement of all material and the layout and accomplishment of all work, as specified herein or indicated on the contract drawings. The movement of plant between acceptance sections, as indicated on the contract drawings, shall be included in the unit price. All MAINTENANCE materials shall be paid at the contract price under CLIN 0008. Payment for MAINTENANCE material removed shall not exceed the Before Dredge quantities for each acceptance section. The contract price per cubic yard for dredging shall be applicable to quantities in any extensions of the dredging limits except as provided in Paragraph “Variations In Estimated Quantity – Dredging”. Calculated volumes for cubic yardage will be determined according to Subsection SURVEY for payment purposes.

ITEM 0009, DREDGING OF UNCLASSIFIED NEW WORK MATERIAL IN CHARLESTON LOWER

SECTION 35 20 23 PAGE 9

HAROR AND COOPER RIVER ACCEPTANCE SECTIONS 8 & 9 (ODMDS PLACEMENT), shall include the cost of removal and placement (ODMDS) of all material and the layout and accomplishment of all work, as specified herein or indicated on the contract drawings. The movement of plant between acceptance sections, as indicated on the contract drawings, shall be included in the unit price. All NEW WORK materials shall be paid at the contract price under CLIN 0009.

Payment for NEW WORK material removed shall not exceed the Before Dredge quantities for each acceptance section. The contract price per cubic yard for dredging shall be applicable to quantities in any extensions of the dredging limits except as provided in Paragraph “Variations In Estimated Quantity – Dredging”. Calculated volumes for cubic yardage will be determined according to Subsection SURVEY for payment purposes.

ITEM 0011, MOBILIZATION AND DEMOBILIZATION - MAINTENANCE DREDGING IN

CHARLESTON LOWER HARBOR SHOALS 2, 3, 3A, 4, 4A, shall include all costs connected with the mobilization and demobilization of all dredging plant and equipment required to complete the work to and from the project site. Sixty percent (60%) of this CLIN will be paid when scheduled mobilization work has been completed, and the remaining forty percent (40%) will be paid when scheduled demobilization has been completed. If incremental or multiple mobilizations and demobilizations are anticipated, then the line item price shall be spread proportionately across the various mobilization or demobilization events as detailed in the accepted project schedule. The percentage assigned to each event will be paid after completion of the event.

The sum of all the mobilizations shall not exceed sixty percent (60%) of CLIN 0001, and the sum of all the demobilizations shall not exceed forty percent (40%) of CLIN 0011, and the total payment shall not exceed the CLIN 0011 price. All effort associated with moving the plant and equipment within the project site shall be included in the unit price for the Line Item Number being worked and not in the mobilization and demobilization CLIN 0011.

ITEM 0012, DREDGING OF UNCLASSIFIED MAINTENANCE MATERIAL IN CHARLESTON LOWER

HARBOR SHOALS 2, 3, 3A, 4, 4A(ODMDS PLACEMENT), shall include the cost of removal and placement (ODMDS) of all material and the layout and accomplishment of all work, as specified herein or indicated on the contract drawings. The movement of plant between acceptance sections, as indicated on the contract drawings, shall be included in the unit price. All MAINTENANCE materials shall be paid at the contract price under CLIN 0012. Payment for MAINTENANCE material removed shall not exceed the Before Dredge quantities for each shoal. The contract price per cubic yard for dredging shall be applicable to quantities in any extensions of the dredging limits except as provided in Paragraph “Variations In Estimated Quantity – Dredging”.

Calculated volumes for cubic yardage will be determined according to Subsection SURVEY for payment purposes.

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1.4.3. Estimated Quantities

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

REQUIRED

MAINTENANCE

DREDGING

PRISM

REQUIRED

NEW WORK

DREDGING

PRISM

ALLOWABLE

OVERDEPTH

PRISM

TOTAL ACCEPTANCE

SECTION

NO. LOCATION CY MEAS. * CY

MEAS.*

CY

MEAS.**

CY MEAS.

BASE

1 Daniel Island Reach East Widener 0 224,000 0 224,000

1569+60 to 1592+25

2 HLT Turning Basin South 0 474,000 0 474,000

1555+40 to 1589+21

3 HLT Berth South 0 193,000 21,000 214,000

1562+57 to 1582+44

4 HLT Turning Basin North 0 546,000 0 546,000

1582+43 to 1597+26

5 HLT Berth North 0 251,000 18,000 269,000

1581+17 to 1595+11

6 Daniel Island Reach & East Widener 271,000 1,415,000 256,000 1,942,000

1533+20 to 1597+85 100,000*** 100,000***

7 HLT Turning Basin 0 1,180,000 104,000 1,284,000

1555+40 to 1597+26 100,000*** 100,000***

8 Meyers Bend 43,000 197,000 260,000 500,000

1503+25 to 1533+20 25,000*** 25,000***

9 Drum Island Reach 121,000 130,000 237,000 488,000

1465+80 to 1503+25 35,000*** 35,000***

OPTION

12 Shoals 2, 3, 3A, 4, & 4A 527,000 0 320,000 847,000

TOTALS 1,222,000 4,610,000 1,216,000 7,048,000

NOTE:

* 1. Required depth will be as shown on the contract drawings. The required dredging prism quantities include the required maintenance, new work and side slope material associated with the required depth. Side slopes are

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required to be cleared for new work acceptance only.

** 2. The allowable overdepth quantities include the allowable overdepth in the side slopes as shown on the contract drawings.

*** 3. Additional estimated shoaling to occur between acceptance of sections as laid out in the Order of Work, and the required maintenance work, and before dredge survey of new work in Acceptance Sections 6, 7, 8, and 9.

1.4.4. Variations In Estimated Quantity – Dredging

In reference to contract Clause FAR 52.211-18 VARIATIONS IN ESTIMATED QUANTITY, consideration for equitable adjustment will be determined as follows:

Where the quantity of a pay item in this contract is an estimated quantity and where the actual quantity of material within the required dredging prism varies more than fifteen percent (15%) above or below the stated estimated quantity within the dredging prism, an equitable adjustment in the contract unit price will be made upon demand of either party. The equitable adjustment will be based upon any increase or decrease in costs due solely to the variations above one hundred fifteen percent (115%) or below eighty-five percent (85%) of the estimated quantity within the dredging prism. No consideration for an adjustment in the contract unit price will be given for any variation in quantities of material below the required dredging prism or outside the associated side slope lines; such quantities will not be subject to any adjusted unit price.

1.4.5. 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, dredging at contract price, within the limits of available funds, may be done if agreeable to both the Contractor and the Contracting Officer. Shoaling, including natural lowering of the side slopes, that occurs after the before dredge survey for an Acceptance Section and before final acceptance of that Section, shall be the responsibility of the Contractor to remove, at no additional costs to the Government, except in the case of the Government directing the Contractor to move at the direction of the Contracting Officer, or due to the Order of Work requirement under this contract as explained in subparagraph “Final Examination of Work”.

1.5. SUBMITTALS

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

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with this section.

SD-01 Preconstruction Submittals

Plant & Equipment Schedule (Reference Paragraph “Equipment and Machinery”)

SD-04 Samples

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Summary Disposal Area Maps (Reference Paragraph “Disposal Area Maps”)

SD-05 Design Data

Work Plan (Reference Subsection ORDER OF WORK)

SD-09 Reports

Ocean Disposal Verification Spreadsheet (Reference Paragraph “Verification Spreadsheet”)

Report of Daily Dump Logs (Reference Paragraph “Dump Logs”)

SD-11 Closeout Submittals

Consolidated Report (Reference Subsection CONSOLIDATED REPORT), G

1.6. CHARACTER OF MATERIALS

All dredge excavation will be unclassified, regardless of the nature of the materials encountered. It is the responsibility of the bidders to analyze the associated geotechnical information located in the ATTACHMENTS to determine for themselves the character and dredgeability of the materials, the volumes of different types of materials, and the difficulties inherent to performing the scoped work. The Contractor is responsible for properly preparing himself and his equipment to deal with the existing geologic conditions at the project site.

1.6.1. Maintenance

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

The previously maintained depths were 47 feet in the channel plus up to 2 feet allowable overdepth, plus any advanced maintenance in applicable areas.

For purposes of this contract, all materials in Acceptance Sections 6, 8, and 9 shoaler than 48 feet shall be defined as maintenance, and shall be paid at the contract price for maintenance dredging in those templates where maintenance material is included. In areas of this project where advanced maintenance has been previously authorized and dredged, the maintenance depths will be 52 feet (AS-9 Drum Island Reach). These areas are identified on the contract drawings by cross hatching.

Soils encountered during maintenance dredging are typically unconsolidated and unlithified in-shoal material consisting of very soft to soft organic silts, variable-sized sand, clay, silt, gravel, and admixtures of these soil types.

1.6.2. New Work

For the purpose of this contract, all materials in Acceptance Sections 1, 2, 3, 4, 5, and 7 shall be defined as new work. All materials in Acceptance Sections 6, 8, and 9 dredged below 48 feet within the construction template shall be defined as new work. All materials dredged in wideners shall be considered new work. In areas of this project where advanced maintenance has been previously authorized and dredged, the new work depths will be any materials below 52 feet (AS-9 Drum Island Reach).

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Geotechnical information concerning the geologic materials to be dredged in the new work is provided in the ATTACHMENTS. Elevations shown on the boring logs and condition survey reflect the condition of the channel bottom at the time the survey/boring was taken. Elevation correction for MLW on borings is MLLW = MLW -0.20 feet. The Contractor should be aware that a portion of the geologic material that was originally sampled by a particular boring may have been removed by subsequent dredging or erosion. The Plan Sheets show the location of all geotechnical borings drilled within the harbor acceptance sections. A summary boring table, which contains boring coordinates, elevation intercept with respect to channel bottom, and general soils information is provided in the ATTACHMENTS. Drilling logs from borings drilled prior to 2004 may show coordinates that are in World Geographic Reference System or South Carolina State Plane, North American Datum 1927, Survey Feet. These coordinate locations were converted to South Carolina State Plane International Feet, North American Datum 1983, and are shown on the plan sheets and in the boring summary information table in the

ATTACHMENTS.

New Work Material that is expected to be encountered within Acceptance Sections 1, 2, 3, 4, 5, 6, and 7 generally consist of stiff to hard calcareous lean silt and clay, with minor amounts of medium dense silty to clayey sand. Standard Penetrometer Test (ASTM D1586) maximum N-values range from 9 to 37. Acceptance Section 8 is floored by similar material; very stiff to hard, calcareous clayey silt and silty clay, with variable amounts of fine sand. Maximum SPT N-values range from 19 to 30. Acceptance Section 9 is floored by stiff to very stiff calcareous silt and clay, interspersed with deposits of very soft fat clay, peat, and loose silty sands. Maximum SPT N-values range from 12 to 21.

1.6.3. Historical Geotechnical Reports

The table below lists the subsurface investigation reports that have been commissioned by USACE or the SCSPA, pertaining to the harbor areas to be dredged in this contract. These reports are geotechnical and/or environmental in scope and they span a time period from 1986 to 2013. The reports can be downloaded from USACE and used in conjunction with the geotechnical products provided in the ATTACHMENTS. The reports are available for download with the solicitation from Federal Biz Ops (fbo.gov).

Investigation Type # Pages 1986 OSI Subsurface Investigation Charleston Harbor Vibracore Drilling 467 p.

2004 Battelle Environmental Testing Lower Harbor Vibracore Drilling 1165 p.

2012 CCU Hard Bottom & Cultural Resource Survey Geophysical Survey 293 p. & data 2012-2013 Anamar Environmental Testing Upper & Lower Harbor

Vibracore Drilling 72 p + appendices

2017 Terracon – HLT Detailed Design Geotechnical Baseline Report

Soil Test Boring 67 p.

1.6.4. Debris

Bidders should expect to encounter some debris during dredging operations such as, but not limited to, logs, trees, wood debris, misplaced riprap, misplaced stone, chains, buoy anchors, cables, miscellaneous trash, pipes, ropes, and other natural or artificial obstructions. The Government has no knowledge of existing wrecks, wreckage, or other material of such size or character as to require the use of explosives or special or additional plant for its economical removal. If in the judgment of the Contracting Officer the

SECTION 35 20 23 PAGE 14

debris can be removed during normal dredging operations, it shall be removed by the Contractor. Debris removed from the dredged area shall be removed from the water. Disposal shall be the responsibility of the Contractor and disposal shall be outside the limits of government property. 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 Government provided dredged material placement areas unless otherwise specified.

1.6.5. Unexploded Ordnance

In a previous permit issued for dredging in the vicinity of the Hugh G.

Leatherman Terminal(HLT), an area of concern (AOC 501) for unexploded ordnance (UXO) was defined. This area is displayed in the contract drawings.

AOC 501 lies mostly within an area outside of the authorized (45-foot) federal channel, and had not previously been dredged prior to construction of the HLT facility. A private, new work dredging event has since occurred over the area. For this reason, it is not anticipated to be encountered on this project, but has been previously encountered in the past in nearby areas. The Contractor is not entitled to an equitable adjustment or reimbursement for work stoppages totaling 24 hours or less from the time the Contracting Officer directs the Contractor to stop dredging operations. Each encounter shall be handled on a case by case basis. A standard operating procedure for encountering UXO shall be included in an Unexploded Ordnance Plan which shall be incorporated into the Accident Prevention Plan.

If an UXO is encountered, Contractor shall immediately contact the United States Coast Guard (USCG) – Sector Charleston Command Center for instruction.

The USCG will coordinate with the local sheriff and the Air Force EOD. Upon receiving instruction from the USCG, the Contractor shall immediately notify the COR.

1.7. CONSOLIDATED REPORT

The Contractor shall submit a consolidated report within 30 days after completion of all work associated with this contract and shall include, as a minimum, the information listed on the form, CONSOLIDATED REPORT provided in the ATTACHMENTS. Final payment to the Contractor will not be made until this report has been received by the Contracting Officer.

PART 2 PRODUCTS (Not Applicable)

PART 3 EXECUTION

3.1. ORDER OF WORK

In order to accommodate the delivery of gantry cranes to the Hugh Leatherman Terminal on 01 April 2021, as well as to maintain the existing 45 feet authorized channel in the lower harbor, an order of work shall be followed as laid out below.

First Order of Work:

Contractor shall complete dredging to prescribed limits and depths, as shown in the contract drawings, for Acceptance Sections 1, 2, & 3 no later than 31 March 2021. The intent of this item of work is to create access to the HLT wharf (currently under construction on a separate contract) so that the South Carolina Ports Authority can receive gantry crane delivery on 01 April 2021.

MAINTENANCE AND NEW WORK DREDGING

SECTION 35 20 23 PAGE 15

Contractor shall be responsible for in-field coordination with the South Carolina Ports Authority (SCPA), and their subcontractors, regarding berth availability and timing. Due to ongoing wharf construction activities at Hugh Leatherman Terminal, Contractor should expect disruptions to work continuity due to site construction vessel traffic. Disruptions are expected to be minor.

In order to reduce the possibility of delays to the bulk of this work, the dredging of the Area Of Concern – AOC 501 shall be dredged last.

Second Order of Work:

Contractor shall complete dredging of all maintenance materials, as shown in the contract drawings, for Acceptance Sections 6, 8, and 9, within 180 days of receipt of the Notice to Proceed. If Contractor plans to use multiple dredging plant, then the maintenance work may occur concurrently with the first order of work, so long as one dredging plant continues to work on the first order of work, and with approval from the COR, and/or his representative by demonstrating that the first order of work remains on schedule.

Third Order of Work:

Contractor shall complete dredging of all maintenance materials, as shown in the contract drawings, for Shoals 2, 3, 3A, 4, 4A. If Contractor plans to use multiple dredging plant, then the maintenance work may occur concurrently with the first and second orders of work, so long as a dredging plant continues to work on the first and second orders of work, and with approval from the COR, and/or his representative by demonstrating that the first order of work remains on schedule..

Also, under this contract, the Contractor must comply with environmental dredging requirements as described in Section 01 57 20.00 10 ENVIRONMENTAL PROTECTION. The Contracting Officer may alter order of work, and if necessary, may direct the Contractor to move at no additional cost to the Government. Dredging of acceptance sections shall be listed in a work plan for performing the work to be submitted by the Contractor. The plan shall include a schedule, equipment list and description, and description of how the work is to be accomplished. The work plan shall be submitted for Contracting Officer’s acceptance a minimum of 14 days before any construction is to be performed.

Approval of the Contracting Officer must be received by the Contractor before dredging may commence on the next acceptance section prior to the completion and acceptance of the previous acceptance section.

3.2. INSPECTION

All work will be conducted under the general direction of the Contracting Officer and shall be subject to full-time inspection by his appointed Representative to ensure strict compliance with the terms of the contract.

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 shall:

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SECTION 35 20 23 PAGE 16

(a) 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 the work. However, the Contractor will not be required to furnish such facilities for the surveys prescribed in the Subsection

EXAMINATION AND ACCEPTANCE.

(b) 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 disposal area.

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. PLANT

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 Paragraph "Equipment and Machinery" 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 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.

3.3.1. 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 plant list, as specified in Section 00 45 00 Representations & Certifications, 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.

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

3.3.1.2. 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.

3.3.1.3. Signal Lights

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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.

3.3.1.4. 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 approved by the Federal Communications Commission for this purpose. It is not required that this 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.

3.3.1.5. Automatic Identification System

The Contractor is required to have the Automatic Identification System (AIS).

The Contractor shall have AIS transponders on all floating plants 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.

3.3.2. Pipelines

The Contractor will be responsible to ensure that all 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. Dredge pipelines that are floating, to include rubber discharge hoses, 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.

3.3.2.1. Submerged Pipeline

Submerged pipeline shall rest on the channel bottom. Where a submerged pipeline crosses a navigation channel, the top of the pipeline and any anchor securing the pipe shall be no higher than the authorized channel depth in which the pipe is placed. Pipelines shall not be permitted to fluctuate between the water surface and the channel bottom or lie partially submerged.

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

3.3.2.2. Floating Pipeline

The dredge operator will assure that the pipeline remains fully submerged and on the bottom; however, when it is necessary to raise the pipeline, proper

SECTION 35 20 23 PAGE 18

clearances shall be made and maintained and the entire length of the pipeline will be adequately marked.

3.3.2.3. Marking the Location of the Pipeline

Pipeline shall be marked in accordance with local USCG requirements and 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 feet (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.

(e) Lengths of 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 feet (152.4 m) to clearly show the pipeline length and course.

(f) All pipeline or fittings with less than six (6) feet of clearance between the top of the pipeline and mean low water will be marked with the same type of light meeting the requirements of this subsection and spaced approximately one hundred (100) feet apart.

3.3.3. 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 this subsection.

(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 this subsection.

(5) In-water lines (rope, chain, and cable, including the lines to secure turbidity curtains) must be stiff, taut, and unable to loop or tangle to minimize the possibility of a sea turtle becoming entangled. Examples of such lines are heavy metal chains or heavy cables that do not readily loop and tangle. For flexible in-water lines, such as nylon rope or any lines that could loop or tangle, care must be taken to ensure that all lines are rigged properly, utilizing the correct amount of line to best prevent the line from looping and tangling. In all instances, no excess line is allowed in the water.

SECTION 35 20 23 PAGE 19

3.3.3.1. Lights, Lighted Buoys and Dredging Aids Markers

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 this specification.

3.3.4. 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.