B.08.03 W912EP21B0003 KB Sub Base FY21, Amendment 0002.pdf

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53.243

1. See SF30 Continuation Sheet for Amendment Details.

2. The Bid Due Date Remains Unchanged.

1. CONTRACT ID CODE PAGE OF PAGES

J 1 26

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street , County, State and Zip Code) X W912EP21B0003

X 9B. DATED (SEE ITEM 11)

24-Nov-2020

10B. DATED (SEE ITEM 13)

9A. AMENDMENT OF SOLICITATION NO.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer is extended, X is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning 1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN

REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO.

5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

17-Dec-2020

CODE

USA ENGINEER DISTRICT, JACKSONVILLE

CONTRACTING DIVISION

701 SAN MARCO BLVD

JACKSONVILLE FL 32207-8175

W912EP 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

SF 30 CONTINUATION SHEET

Naval Submarine Base Kings Bay, Maintenance Dredging, 44, 45, and 47-Foot Project, Camden County, Georgia

W912EP21B0003 2 Amendment 0002

SUMMARY OF CHANGES

1. SPECIFICATIONS:

Text changes have been updated with additions noted by underlined text (green in PDF) and deletions noted by line/cross-outs (red in PDF). These text changes pertain only to changes made by this amendment.

DELETE Section 35 20 23 and REPLACE with the attached revised Section 35 20 23.

2. DRAWINGS:

DELETE Sheet ID G-03 and REPLACE with the attached revised Sheet ID G-03.

DELETE Sheet ID C-01 and REPLACE with the attached revised Sheet ID C-01.

DELETE Sheet ID C-02 and REPLACE with the attached revised Sheet ID C-02.

(End of Summary of Changes)

Naval Submarine Base Kings Bay, Maintenance Dredging 44, 45, and 47-Foot Project, Camden County, Georgia

SECTION TABLE OF CONTENTS

DIVISION 35 - WATERWAY AND MARINE CONSTRUCTION

SECTION 35 20 23

DREDGING

PART 1 GENERAL

1.1 SCOPE

1.2 REFERENCES

1.3 SUBMITTALS

1.4 DREDGING RESTRICTIONS

1.4.1 Order of Work

1.4.1.1 Naval Submarine Base Kings Bay Maintenance Dredging

1.4.2 Hopper Restriction

1.4.3 Rehandling Facility

1.5 SPECIAL INSTRUCTIONS

1.6 PUMPING OF BILGES

1.7 HISTORICAL PERIOD SHIPWRECK SITES

1.8 UTILITY CROSSINGS

1.8.1 General

1.9 PERMITS

1.10 FUEL OIL TRANSFER OPERATIONS

1.11 SIGNAL LIGHTS

1.12 NOTICE TO MARINERS -- DREDGING CONTRACTS

1.13 FINAL CLEANUP

1.14 WORK VIOLATIONS

1.15 NATIONAL DREDGING QUALITY MANAGEMENT PROGRAM SYSTEM (DREDGES AND

DUMP SCOWS)

1.15.1 System Requirements

PART 2 PRODUCTS

2.1 WEIR RISER BOARDS

PART 3 EXECUTION

3.1 NOTIFICATION OF COAST GUARD

3.1.1 Relocation of Navigation Aids

3.1.2 Dredging Aids

3.2 WORK AREA

3.2.1 Access

3.2.2 Protection of Existing Waterways

3.2.3 Adjacent Property and Waterfront Structures

3.2.3.1 Magnetic Silencing Facility (MSF)

3.2.3.2 Explosive Handling Wharves (EHW)

3.2.3.3 Refit Wharves

3.2.3.4 Drydock Caisson Gate Sill and Mooring Facility

3.2.4 Subaqueous Cable Crossings

3.3 DISPOSAL OF EXCAVATED MATERIAL

3.3.1 General

3.3.1.1 Disposal Area Details

SECTION 35 20 23 Page 1 W912EP21B0003 Amendment 0002

3.3.2 Location of Pipeline Discharge Area

3.3.3 Maximum Height of Dredged Materials

3.3.4 Upland Disposal Area Management

3.3.4.1 Exterior Disposal Area Drainage

3.3.4.2 Operation of Weirs

3.3.5 Placing of Dredged Material

3.3.6 Dredge Pipelines

3.3.6.1 Dredge Discharge Pipeline

3.3.6.1.1 Existing Dredge Pipe Installed by the Navy

3.3.6.1.2 Existing Dredge Pipe Isolation Box

3.3.6.2 Submerged Pipeline

3.3.6.3 Floating Pipeline

3.3.7 Booster Pumps

3.3.8 Misplaced Material

3.4 REQUIRED DEPTH, ALLOWABLE OVERDEPTH, AND SIDE SLOPES

3.4.1 Required Depth

3.4.2 Allowable Overdepth

3.4.3 Side Slopes

3.4.4 Excessive Dredging

3.4.5 Areas to be Dredged

3.4.6 Acceptance Sections

3.5 SURVEYS

3.5.1 General

3.5.2 Contractor Representative

3.5.3 Survey Conflict Identification, Notification and Resolution

3.5.4 Tide Data

3.5.4.1 Real Time Kinematic (RTK) GPS

3.5.4.2 Kinematic Tidal Datum (KTD Data File)

3.5.4.3 Non-Operational Reference Station

3.6 INSPECTION

3.6.1 Quality Assurance Representative (QAR)

3.6.2 Failure to Comply

3.7 FINAL EXAMINATION AND ACCEPTANCE

3.7.1 Final Examination of Work

3.7.2 Final Acceptance

3.8 SHOALING

3.9 CONTINUITY OF WORK

3.10 NOISE CONTROL

3.11 DREDGE CERTIFICATION

3.12 GENERAL DREDGING SAFETY REQUIREMENTS

3.12.1 Dredge Plant Restriction Definitions

3.12.2 Certification of Attendant and Auxiliary Plant

3.12.3 Minimum Tow-Boat Requirements

3.13 CONSTRUCTION FORMS AND DETAILS

-- End of Section Table of Contents --

SECTION 35 20 23 Page 2

SECTION 35 20 23

DREDGING

PART 1 GENERAL

1.1 SCOPE

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

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

1.2 REFERENCES

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

AMERICAN WOOD PROTECTION ASSOCIATION (AWPA)

AWPA C2 (2003) Lumber, Timber, Bridge Ties and Mine Ties - Preservative Treatment by Pressure Processes

AWPA M4 (2015) Standard for the Care of Preservative-Treated Wood Products

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 385-1-1 Safety and Health Requirements Manual

EM 1110-1-1000 (2015) Photogrammetric Mapping

EM 1110-1-1002 (2012) Survey Markers and Monumentation

EM 1110-1-1003 (2011) NAVSTAR Global Positioning System Surveying

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

EM 1110-1-2909 (2012) Geospatial Data and Systems

EM 1110-2-1003 (2013) Hydrographic Surveying

SECTION 35 20 23 Page 3

TRI-SERVICE STANDARDS (TSS)

TSS (2006) A/E/C CADD Standards

1.3 SUBMITTALS

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

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

SD-01 Preconstruction Submittals

Notice of Intent to Dredge

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

Relocation of Navigation Aids

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

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

SD-02 Shop Drawings

Acceptance Sections Plan ; G, DO

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

Drag Bar ; G, DO

Submit design drawings and one photograph showing drag bar equipment used for final leveling work for approval by the Government prior to commencement of work. The drag bar shall meet the Drag Bar Design and Operation Criteria appended after the end of this section (Appendix B). See paragraph FINAL EXAMINATION AND ACCEPTANCE below.

SECTION 35 20 23 Page 4

Dredging and Disposal Plan ; G, AO

For Base work, the Contractor shall submit a dredging and disposal plan thirty (30) days prior to commencement of dredging, to be approved by the Contracting Officer prior to the commencement of dredging. For work required in options, the Contractor shall submit a dredging and disposal plan thirty (30) days prior to commencement of dredging, to be approved by the Contracting Officer prior to the commencement of dredging. The dredging and disposal plan must include the dredging plant the Contractor intends to use on each bid item and a schedule indicating starting and completion dates for each dredging section. The Contractor's dredging and disposal plan as well as operations plan shall ensure the following:

a. Sufficient ponding area within the disposal area(s) for proper effluent water quality.

b. Dredge size and production rates suitable to the disposal area(s) size and proper effluent discharge rates.

c. The dredging plan shall also include (but is not limited to) the following:

(1) A description and schedule of all operations that will be performed in connection with the removal and transport of material. The operations shall be described in the sequence in which they will be performed.

(2) A description of all plant (including names of dredges) and equipment that will be utilized in connection with the removal and transport material.

(3) Plant to be used in each section.

(4) A description of the plan of operation of the weir, including which weirs will be used during dredging operations.

d. The Contracting Officer must approve the operations plan prior to mobilization and any operation plan modifications prior to their implementation. The operations plan must be explicit and must include, but is not limited to the following:

(1) Shifts and crew sizes.

(2) Communications.

(3) Procedure for dredging the area within the EHWs. The operations will be described in the sequence in which they will be performed.

(4) How the depth and horizontal positioning of the dredge head will be monitored and how the depth measurement will be calibrated.

SD-07 Certificates

Equipment and Performance Data

The Contractor shall furnish proof of electronic positioning

SECTION 35 20 23 Page 5 equipment calibration to the Contracting Officer.

Historical Period Shipwreck Sites

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

Surveys

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

Daily/Monthly Report of Operations

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

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

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

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

Misplaced Material

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

Declaration of Inspection for Refueling

Refer to paragraph FUEL OIL TRANSFER OPERATIONS below for submittal.

1.4 DREDGING RESTRICTIONS

1.4.1 Order of Work

The Contractor shall perform the Order of Work as directed by the Contracting Officer. Incoming Naval Vessels move into and out at any

SECTION 35 20 23 Page 6 time without notice; therefore, dredging operations may have to move if so directed by the Contracting Officer.

1.4.1.1 Naval Submarine Base Kings Bay Maintenance Dredging

The Order of Work for base dredging with shall be directed insofar as practicable to provide for efficient operation of the dredging equipment.

Dredging operations at piers and facilities may require moving a dredge outside of a security zone to work an adjacent area until the security zone becomes available to dredge again. Every effort will be made to keep the moves local so as not to require the relocation of the head section to the floating pipe. These moves are normally planned at least 24 hours ahead of time. The channel between station 40+500 of Range-G to station 44+250 of Range-H requires the most coordination due to the frequency and size of the security arcs. Orders to the Contractor's Representative at the site of the work will be in writing based on sections as shown on the contract drawings.

1.4.2 Hopper Restriction

The use of hopper dredges is prohibited.

1.4.3 Rehandling Facility

Due to the environmental sensitivity of dredging in the Kings Bay and Cumberland Sound area, no material rehandling is or will be available. No agitation dredging is permitted.

1.5 SPECIAL INSTRUCTIONS

Dredging of insitu rock is not required; but if encountered, the location and extent of any insitu rock above grade or required depth shall be reported to the Contracting Officer. All anchors and wires need to be clear of the channel. In the past dredging projects, there were high spots encountered at several locations the dredge could not reach the required depth because they were hitting hard bottom. Those areas were near the non-open end of the Explosive Handling Wharf-2 at approximately station 41+300, at the edge of the security arc next to the Explosive Handling Wharf 1 (outside the finger pier) at approximately station 42+700, and at the North end of Refit Wharf-1 at approximately station 48+800. All debris encountered during the dredging process shall become property of the Contractor and shall be removed and disposed in an offsite landfill selected by the Contractor and approved by the Contracting Officer.

1.6 PUMPING OF BILGES

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

1.7 HISTORICAL PERIOD SHIPWRECK SITES

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

a. The site(s), articles, or other materials are the property of

SECTION 35 20 23 Page 7 the State of Georgia; and that,

b. They will immediately notify the Contracting Officer.

1.8 UTILITY CROSSINGS

1.8.1 General

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

1.9 PERMITS

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

PROTECTION.

1.10 FUEL OIL TRANSFER OPERATIONS

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

1.11 SIGNAL LIGHTS

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

1.12 NOTICE TO MARINERS -- DREDGING CONTRACTS

Should the Contractor, during operations, encounter any objects on the channel bottom which could be a hazard to navigation, the Contractor shall immediately notify the Contracting Officer as to the location of said

SECTION 35 20 23 Page 8 object and shall provide any other pertinent information necessary for the Contracting Officer to prepare and issue a Notice to Mariners.

1.13 FINAL CLEANUP

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

1.14 WORK VIOLATIONS

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

1.15 NATIONAL DREDGING QUALITY MANAGEMENT PROGRAM SYSTEM (DREDGES AND DUMP

SCOWS)

1.15.1 System Requirements

See Section 35 20 26 NATIONAL DREDGING QUALITY MANAGEMENT PROGRAM SCOW - ULLAGE PROFILE in the Base MATOC contract . The only submittal required for each section is the "Letter of National Dredging Quality Management Program Certification" (see the Submittal Register). However, in the event of NDQMP System failure (not fully operational), notify the Contracting Officer. If, upon NDQMP System failure, the Contractor cannot use the NDQMP System within 48 hours of failure, all dredging operations for the vessel shall cease until the NDQMP System is fully operational.

Any delays resulting from NDQMP System failure shall be at the Contractor's expense. When required to calculate displacement, the density of water shall be 64 pounds per cubic foot or its metric equivalent of 1027 kilograms per cubic meter.

PART 2 PRODUCTS

2.1 WEIR RISER BOARDS

If Option A is awarded, the Contractor shall supply additional Weir Riser Boards to augment the existing riser boards on site. The number of riser boards to be supplied will be determined by the Contracting Officer's Representative. The supplied riser boards shall be made of No. 2 grade or better Southern Pine lumber to the following dimensions: 3 inches x 6 inches x 4.25 feet +/- 0.5 foot'. They shall be pressure preservative treated with 2.5 lbs/cf CCA in accordance with AWPA C2. The riser boards shall be field fitted by the Contractor and must fit well with no binding or excessive looseness. All raw wood exposed by cutting the riser boards

SECTION 35 20 23 Page 9 to fit shall receive field-applied preservative treatment in accordance with AWPA M4.

PART 3 EXECUTION

3.1 NOTIFICATION OF COAST GUARD

3.1.1 Relocation of Navigation Aids

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

3.1.2 Dredging Aids

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

3.2 WORK AREA

The Contractor will be permitted to exclude the public from the work areas in the immediate vicinity of his dredging, transporting, and disposal operations. The Contractor shall prevent public access to the discharge end of the pipeline. The Contractor shall erect, maintain, and move as necessary, a restrictive barrier around the discharge of the hydraulic pipeline. The barrier shall be constructed so as to prevent the public from approaching the discharge from any direction closer than 40 feet.

The Contractor shall post signs in a conspicuous location with the wording "DANGER - HIGH PRESSURE DISCHARGE FROM DREDGE". Enforcement shall be the Contractor's responsibility at no additional cost to the Government. The enforcement shall be coordinated with local enforcement agencies and will be subject to approval of the Contracting Officer.

3.2.1 Access

The Contractor shall be responsible for providing and maintaining access necessary for his equipment and plant to and from the work site, mooring area, and disposal area. The Contractor shall ascertain the environmental conditions which can affect the access such as climate, winds, currents, waves, depths, shoaling, and scouring tendencies.

3.2.2 Protection of Existing Waterways

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

SECTION 35 20 23 Page 10

3.2.3 Adjacent Property and Waterfront Structures

Material is required to be removed adjacent to waterfront structures.

Controlled dredging will be required in these areas to prevent damage to the structures. The Contractor shall assure that there is no dredging within 15 feet offset distance of any pier, dock faces, buoys and their chains, anchor chains, or other waterfront structures in order to prevent damage to fender pilings and any other part of these structures unless otherwise indicated on the drawings or directed by the Contracting Officer. The Site Six North Expanded Basin has a 25 foot dredging offset from structures. However, there is no offset from the Drydock Caisson Gate Sill and Drydock Caisson Gate Mooring Facility as indicated on the drawings, unless otherwise directed by the Contracting Officer. The Contractor shall not use wire rope on bollards and cleats. Only manila or nylon line is to be used. The Contractor shall be responsible for any damage to these structures caused by the Contractor's operations and will be responsible for the cost of repairs made to that structure.

3.2.3.1 Magnetic Silencing Facility (MSF)

The Magnetic Silencing Facility (MSF) slip has limited accessibility and accurate positioning will be required for dredging near the MSF slip.

Underwater sensors and bundled cables are located directly beneath and in the vicinity of the slip. No dredging is allowed within the Dredging Exclusion Zone shown on the drawings.

3.2.3.2 Explosive Handling Wharves (EHW)

EHW berthing areas are covered by buildings with a clear opening of approximately 86 feet 6 inches wide by 55 feet high at Mean High Water (MHW). Inside the EHW buildings, the vertical clearance is approximately 115 feet at MHW. There is a warping wharf between the two buildings approximately 1,000 feet long, along which dredging is required. The Contractor shall immediately make repairs to or replace and return to original condition all damaged lumber and concrete after completion of work within this area. It is possible that debris may be encountered within the limits of EHW Buildings #1 and #2. The debris could potentially consist of tools and other small items, steel cable, and sheeting material. See paragraph SPECIAL INSTRUCTIONS above.

3.2.3.3 Refit Wharves

The shoreline underneath the refit wharves has been riprapped. A riprap keyway was constructed at the toe of the slope as shown on the cross-sections of the drawings. This riprap keyway is not to be removed.

When working in this area, the Contractor shall not use wire rope on bollards and cleats. Only manila or nylon line is to be used. The Contractor shall immediately make repairs to or replace and return to original condition all damaged lumber and concrete after completion of work within this area.

3.2.3.4 Drydock Caisson Gate Sill and Mooring Facility

The Drydock Caisson Gate Sill area is from the end of the navigation channel (Range-I) to the steel caisson gate. The Drydock Caisson Gate Mooring Facility is adjacent to the caisson gate mooring dolphins and caisson gate. If a cutter suction dredge is to be used, the Contractor shall remove the cutter head for the removal of the material from the concrete sill and mooring facility grillage without damaging the concrete

SECTION 35 20 23 Page 11 sill and metal grillage. The dredging location at the Drydock Caisson Gate Sill and the Drydock Caisson Gate Mooring Facility is shown on the drawings or as directed by the Contracting Officer.

3.2.4 Subaqueous Cable Crossings

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

3.3 DISPOSAL OF EXCAVATED MATERIAL

3.3.1 General

Material excavated shall be transported to and deposited in the disposal areas designated on the drawings. The placement areas for dredged material will be at Disposal Area 1 (D/A-1) and Disposal Area 2 (D/A-2).

The approximate maximum and average distances to which the material shall be transported is as follows:

Disposal Areas Maximum Distance Average Distance

D/A-1, 2.4 miles 1.6 miles

D/A-2, 2.0 miles 1.5 miles

3.3.1.1 Disposal Area Details

The Contractor shall place dredged material in the D/A-1 and D/A-2 at the locations shown on the drawings and as indicated in Section 01 11 00

SUMMARY OF WORK.

3.3.2 Location of Pipeline Discharge Area

The pipeline discharge area shall be placed at the location shown on the project drawings as agreed to by the Contracting Officer. Any deviation from the approximate pipeline discharge area shown on the drawings must be approved by the Contracting Officer prior to placement of the dredge pipe in the disposal area. The Contracting Officer may direct periodic movement of the pipeline discharge area as necessary to efficiently maintain the disposal area.

3.3.3 Maximum Height of Dredged Materials

Dredged materials and/or water shall not be placed higher than 4 feet below the lowest point on the dike crest. Constantly monitor the water height while pumping to insure that this clearance is maintained.

Materials deposited in the disposal area above the maximum height or outside the disposal area will result in suspension of dredging operations and require the removal of such materials as a prerequisite to the resumption of dredging.

SECTION 35 20 23 Page 12

3.3.4 Upland Disposal Area Management

Operate, maintain and monitor continuously the disposal area in use. Make necessary minor repairs to the weirs and outfall pipes in order to contain the dredged material and maintain water quality of the effluent. Patrol, maintain and repair any damage to existing weirs and outfall pipes under the dikes. The Contractor is required to provide a vehicle capable of transporting the dike surveillance crews during disposal area operations.

Vehicle access must be provided along the top of all of the dikes at all times. All pipelines shall be adequately ramped over to provide crossover access. Any damage caused to the dike and erosion control systems by the Contractor shall be repaired at the expense of the Contractor.

3.3.4.1 Interior Disposal Area Drainage

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

3.3.4.1 Exterior Disposal Area Drainage

Drainage of areas adjacent to the diked disposal area shall not be blocked or impaired in any manner by the Contractor's operations. Excavate and maintain ditches necessary to prevent blocking or impairing drainage. The ditches shall be of adequate number and size to eliminate all blockage or impairment of drainage adjacent to the diked disposal area.

3.3.4.2 Operation of Weirs

The Contractor shall be responsible for reasonable care in the use of the disposal area, and for the operation and control of the weirs. The Contractor shall manage flows so that all release of effluent can be stopped if required by the Contracting Officer. The Contractor will be responsible to correct any damage caused by the Contractor's operations to disposal area outfalls, riprap and erosion control works.

3.3.5 Placing of Dredged Material

During placement of dredged material in the designated disposal areas, the Contractor will be required to provide constant radio contact between the dredge and the disposal areas and conduct a minimum of two inspections per day of pipeline and dike. Additionally, the Contractor shall place a fill crew member at the discharge end of the disposal pipeline. The fill crew member shall be present at all times during discharge operations and will maintain radio communication between the dredge and the disposal operation. This will enable the Contractor's personnel at the disposal areas to immediately notify the dredge in the event of dike or pipeline failure. In the event of dike or pipeline failure, the dredging operations shall be immediately suspended and require prompt repair of the dike or pipeline as a prerequisite to the resumption of dredging.

Dredging shall not be resumed until the necessary dike repair or pipeline repairs have been completed. The Contractor shall inform the Contracting Officer daily of conditions of any problems associated with the dikes, pipeline, and disposal area discharge. The Contractor shall inform the Contracting Officer at what time the problems were found and time when action was taken to correct the problems. Plant down time to meet the water quality standards or to make dike or pipeline repairs will be at no added cost to the Government or a basis for time extension.

SECTION 35 20 23 Page 13

3.3.6 Dredge Pipelines

3.3.6.1 Dredge Discharge Pipeline

The Contractor shall plainly mark the pipeline access routes with conspicuous stakes, targets and/or buoys to be maintained throughout the contract operations. A tight dredge discharge pipeline shall be maintained to prevent spilling of dredged material or dredge water outside of the disposal area. The Contractor shall provide and maintain radio communication between the dredge and the disposal areas and the dredge and the Contracting Officer. The pipeline shall be inspected at least twice daily for leaks. Failure to immediately repair leaks in the discharge pipeline will result in suspension of dredging operations and require prompt repair of pipeline as a prerequisite to the resumption of dredging. Any damage to private or public property resulting from the Contractor's operations shall be repaired by the Contractor at his expense.

3.3.6.1.1 Existing Dredge Pipe Installed by the Navy

The Navy has constructed a segment of permanent pipeline into Disposal Area 2 (D/A-2) as shown on the drawings. The Contractor shall connect to the end structures of this pipeline at the approximate locations shown on the drawings. The exact location of the end structures will be shown to the Contactor in the field by the Contracting Officer. Prior to connecting to the end structures, the work must be coordinated with base security through the Contracting Officer.

The type of pipe the Contractor shall connect to is 24-inch Ductile Iron Pipe Size (DIPS) Polyethylene (PE) 4710 material with a Dimension Ratio (DR) of 11, pressure rating of 200 psi, and a weight of 75.78 pounds per foot. The average Outside Diameter (OD) is 25.80 inches and the Inside Diameter (ID) is 20.829 inches. The minimum wall thickness is 2.345 inches. See the pipe connection information appended after the end of this section (Appendix A). The pre-flanged pipeline at D/A-2 to extend to the designated pipeline discharge areas shall be located at the site from the previous project along with the flange fasteners.

3.3.6.1.2 Existing Dredge Pipe Isolation Box

The Contractor shall install the spool pieces supplied by the Navy in the isolation box. The Contractor shall supply flange gaskets and fasteners.

Prior to installing the spool pieces, the work must be coordinated with base security through the Contracting Officer.

3.3.6.2 Submerged Pipeline

In the event the Contractor elects to submerge his pipeline, the pipeline shall rest on the bottom, and the top of the submerged pipeline and any anchor securing the submerged pipeline shall be no higher than the required project depth for the channel in which the submerged pipeline is placed. Should the Contractor elect to use a pipeline material which is buoyant or semi-buoyant, such as PVC pipe or similar low density materials, the Contractor shall securely anchor the pipeline to prevent the pipeline from lifting off the bottom under any conditions. The Contractor shall make daily inspections of the submerged pipeline to ensure buoyancy has not loosened the anchors nor leaked any spoil material. Any leakage of material must be reported to the Contracting Officer immediately. The Contractor shall remove all anchors when the

SECTION 35 20 23 Page 14 submerged pipeline is removed. The location of the entire length of submerged pipeline shall be marked with signs, buoys, lights, and flags conforming to U.S. Coast Guard regulations.

3.3.6.3 Floating Pipeline

Should the Contractor's pipeline not rest on the bottom, it will be considered a floating pipeline and shall be visible on the surface and clearly marked. In no case will the Contractor's pipeline be allowed to fluctuate between the surface and the bottom, or lie partly submerged.

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

3.3.7 Booster Pumps

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

3.3.8 Misplaced Material

Materials deposited outside of the designated disposal area(s) will be classified as misplaced material and will result in a suspension of dredging operations. Redredging of such materials will be required as a prerequisite to the resumption of dredging unless the Contracting Officer, at his discretion, determines that redredging of such material is not practical. If redredging of such material is not required then the quantity of such misplaced material shall be deducted from the Contractor's pay quantity.

3.4 REQUIRED DEPTH, ALLOWABLE OVERDEPTH, AND SIDE SLOPES

3.4.1 Required Depth

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

AND PAYMENT.

3.4.2 Allowable Overdepth

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

01 22 00 MEASUREMENT AND PAYMENT.

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3.4.3 Side Slopes

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

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

3.4.4 Excessive Dredging

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

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

3.4.5 Areas to be Dredged

Based on information currently available to the Government, areas known to require dredging are depicted on the drawings as shaded areas. The actual areas to be dredged may vary from the shaded areas shown in the drawings.

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

3.4.6 Acceptance Sections

For purposes of payment, the work to be done will be divided into acceptance sections. Prior to any dredging, the Contractor shall prepare

SECTION 35 20 23 Page 16 and provide a proposed acceptance sections plan for approval by the Contracting Officer. Generally, the work should be divided into areas that equate to approximately 30 days of dredging or that constitute separable or definable features of work.

3.5 SURVEYS

3.5.1 General

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

CONTROL; EM 1110-1-1000 , EM 1110-1-1002 , EM 1110-1-1003 , EM 1110-1-1004 ,

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

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

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

https://cadbimcenter.erdc.dren.mil/default.aspx?p=a&t=1&i=2.

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

3.5.2 Contractor Representative

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

3.5.3 Survey Conflict Identification, Notification and Resolution

In the event the Contractor's authorized representative observes(and quantifies) specific documentary evidence of either fraud, collusion, or obvious error, the Quality Assurance Representative (QAR) will be notified immediately to schedule a meeting between the Contractor and the QAR to expeditiously discuss and resolve the documented observation issue causing the concern. A comparison check between the Government and Contractor survey vessels shall also be immediately scheduled to compare the following items, but not be limited to: single beam comparison lines, multi-beam performance test, and sound velocity value comparison. Survey equipment comparisons shall be conducted concurrently within the project vicinity. Data shall be exchanged and compared to mitigate possible survey equipment biases.

3.5.4 Tide Data

3.5.4.1 Real Time Kinematic (RTK) GPS

The Government will utilize RTK GPS for determining Real Time water levels

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(tide corrections) for measurement and payment purposes. The survey control marks, tidal bench marks, geoid model and tidal datum model file (Kinematic Tidal Datum (KTD) file as specified by the supporting Plans and Specifications' Survey Notes will be used for measurement and payment surveys. The positions reported as being used to perform those surveys will be used, exactly, to perform measurement and payment surveys.

3.5.4.2 Kinematic Tidal Datum (KTD Data File)

A modeled data file listing the separations between NAVD 88 and the Chart Datum (Mean Lower Low Water) is available for the Contactor's use. This file allows for real time tidal datum determination, when properly calibrated to published tidal datum bench marks. The KTD file can be obtained from the Construction Representative. This file must be the exact file as reported within the Survey Notes referenced in paragraph 3.5.4.1, and be calibrated to the same tidal benchmarks' height to achieve comparable results.

3.5.4.3 Non-Operational Reference Station

In the event that the reference station becomes non-operational, the Contractor shall call the point of contact indicated in the paragraph "Real Time Kinematic (RTK) GPS" above.