A21 - GROUP1-24-R-W001_AMDT0001_SUBMITTAL-08.25.26.pdf

Solicitation # GROUP1-24-R-W001 Date: 25 AUGUST 2026 Project Title – ATLANTIC INTRACOASTAL WATERWAY MAINTENANCE DREDGING, FY27

CONTRACT, NORTH CAROLINA

Amendment No. 0001

TECHNICAL SUMMARY OF CHANGES

1. CHANGES TO SPECIFICATIONS.

a SECTION 35 20 23.33 i Replace In Entirety - “National Dredging Quality Management Pipeline Hydraulic Dredge” Section”

1 Replace with “National Dredging Quality Management Small Business Pipeline Hydraulic Dredge” section.

a Sections with revisions:

i 3.1.1.2.3.1 Slurry Velocity ii 3.1.1.2.3.2 Slurry Density iii 3.1.1.3 Dredge Events - State Event

2. CHANGES TO DRAWINGS. Attached hereto are new, revised and deleted, and remove and replace sheets to the plan set. Revision mark “1” is shown on each revised page.

a Sheet No. CN106 – Oak Island Beach Placement i Updated dredge box hatch to match sheet CN107.

b Sheet No. CN109 – Mile Hammock Bay Placement Details (Option) i Clearing lane for dredge pipe expanded from 5’ to 10’.

…end of summary…

FY27 AIWW MAINTENANCE DREDGING AIWWFY27

AMENDMENT 0001 GROUP1-24-R-W001

PROJECT TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

01 14 00 11/22, CHG 5: 05/25 WORK RESTRICTIONS

01 32 01.00 10 08/23, CHG 1: 08/24 PROJECT SCHEDULE

01 33 00 08/18, CHG 4: 02/21 SUBMITTAL PROCEDURES

01 35 26 05/24 GOVERNMENTAL SAFETY REQUIREMENTS

01 42 00 05/24 SOURCES FOR REFERENCE PUBLICATIONS

01 45 00.00 10 11/16, CHG 2: 11/21 QUALITY CONTROL

01 45 00.15 10 11/23 RESIDENT MANAGEMENT SYSTEM CONTRACTOR

MODE (RMS CM)

01 50 00 11/20, CHG 3: 08/24 TEMPORARY CONSTRUCTION FACILITIES AND

CONTROLS

01 57 19 08/22, CHG 2: 08/25 TEMPORARY ENVIRONMENTAL CONTROLS

DIVISION 02 - EXISTING CONDITIONS

02 21 00 09/22 CONSTRUCTION SURVEYS

DIVISION 31 - EARTHWORK

31 11 00.10 03/19 CLEARING

DIVISION 35 - WATERWAY AND MARINE CONSTRUCTION

35 20 23.10 38 08/20 DREDGING

35 20 23.33 38 14 January 2026 NATIONAL DREDGING QUALITY MANAGEMENT

SMALL BUSINESS PIPELINE HYDRAULIC

DREDGE

-- End of Project Table of Contents --

DOCUMENT PROJECT Page 1

SECTION TABLE OF CONTENTS

DIVISION 35 - WATERWAY AND MARINE CONSTRUCTION

SECTION 35 20 23.33

NATIONAL DREDGING QUALITY MANAGEMENT SMALL BUSINESS PIPELINE HYDRAULIC

DREDGE

14 January 2026

PART 1 GENERAL

1.1 DESCRIPTION

1.2 SUBMITTALS

1.3 PAYMENT

1.4 NATIONAL DREDGING QUALITY MANAGEMENT PROGRAM CERTIFICATION

1.5 DREDGE PLANT INSTRUMENTATION PLAN (DPIP)

PART 2 PRODUCTS

PART 3 EXECUTION

3.1 REQUIREMENTS FOR REPORTED DATA

3.1.1 Message Bundle Data

3.1.1.1 Messages

3.1.1.1.1 Message Time

3.1.1.1.2 Comment

3.1.1.2 Dredge Events - Work Event

3.1.1.2.1 Vertical Correction

3.1.1.2.2 Cutter/Suction Head Location and Movement

3.1.1.2.2.1 Cutter/Suction Head Horizontal Position

3.1.1.2.2.2 Cutter/Suction Invert Depth

3.1.1.2.2.3 Cutter/Suction Head Heading

3.1.1.2.3 Dredge Activity

3.1.1.2.3.1 Slurry Velocity

3.1.1.2.3.2 Slurry Density

3.1.1.2.3.3 Pump RPM

3.1.1.2.3.4 Pump Vacuum

3.1.1.2.3.5 Pump Outlet Pressure

3.1.1.2.4 Outfall Information (Open Water/Spill Barge Placement

3.1.1.2.4.1 Discharge Horizontal Position

3.1.1.3 Dredge Events - State Event

3.2 NATIONAL DREDGING QUALITY MANAGEMENT PROGRAM SYSTEM REQUIREMENTS

3.2.1 Direct Data Transmissions to the DQM Web Services

3.2.2 Internet Access

3.2.3 Data Routing Requirements

3.3 DREDGE MONITORING DATA

3.3.1 General

3.3.2 Data Measurement Frequency

3.3.2.1 Work Event Messages

3.3.2.2 State Event Messages

3.3.3 Parameter Transmission to the Web Service

3.3.4 Contractor Data Backup

3.4 PERFORMANCE REQUIREMENTS

3.5 LIST OF ITEMS TO BE PROVIDED BY THE CONTRACTOR

SECTION 35 20 23.33 38 Page 1

-- End of Section Table of Contents --

SECTION 35 20 23.33 38 Page 2

SECTION 35 20 23.33

NATIONAL DREDGING QUALITY MANAGEMENT

SMALL BUSINESS PIPELINE HYDRAULIC DREDGE

14 January 2026

PART 1 GENERAL

1.1 DESCRIPTION

The work under this contract requires use of the US Army Corps of Engineers (USACE) National Dredging Quality Management Program (DQM) to monitor the dredge's status at all times during the contract and manage data history.

This performance-based specification section identifies the minimum required output as well as the precision and instrumentation requirements.

The requirements may be satisfied using equipment and technical procedures selected by the Contractor.

1.2 SUBMITTALS

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

SD-07, Certificates

- National Dredging Quality Management Program Certification; G

1.3 PAYMENT

Separate payment for the installation, operation, and maintenance of the DQM-certified system as specified herein for the duration of the dredging operations is not allowed; all costs in connection therewith are considered a subsidiary obligation of the Contractor and covered under the contract unit price for dredging in the bidding schedule.

1.4 NATIONAL DREDGING QUALITY MANAGEMENT PROGRAM CERTIFICATION

The Contractor is required to have a current certification from the DQM Program for the cutter/suction head hydraulic dredge instrumentation system to be used under this contract. Standard Operating Procedures (SOP) and criteria for certification are presented on the DQM website at https://dqm.usace.army.mil.

1.5 DREDGE PLANT INSTRUMENTATION PLAN (DPIP)

The Contractor must have a digital copy of the Dredge Plant Instrumentation Plan (DPIP) on file with the DQM Support Center. While working on site, the Contractor must also maintain on the dredge a copy of the DPIP, which is easily accessible to Government personnel at all times.

This document must accurately describe the sensors used, the configuration of the system, how sensor data will be collected, how quality control on

SECTION 35 20 23.33 38 Page 3 the data will be performed, and how the sensors/data-reporting equipment will be calibrated and repaired if it fails. A description of the computed dredge-specific data and how the sensor data will be transmitted to the DQM database must also be included. Prior to the start of work, the Contractor must submit to the DQM Support Center any addendum or modifications made to the plan subsequent to its original submission.

Requirements and a template for the DPIP are available on the DQM website at https://dqm.usace.army.mil.

PART 2 PRODUCTS

Not used.

PART 3 EXECUTION

3.1 REQUIREMENTS FOR REPORTED DATA

Provide, operate, and maintain all hardware and software to meet these specifications. The Contractor is also responsible for the replacement, repair, and calibration of the sensors and other necessary data acquisition equipment needed to supply the required data.

Document and complete the procedure to complete a repair as soon as practical. If repair is not possible within two business days of any sensor failure, submit a plan and timeline to complete the repair. Notify the Contracting Officer's Representative (COR)upon completion of a repair, replacement, installation, modification, or calibration. The COR may request recalibration of the sensors or other hardware components at any time during the contract as deemed necessary.

Keep a log of sensor repair, replacement, installation, modification, and calibration in the dredge's onboard copy of the DPIP. The log must contain a three-year history of sensor maintenance, including the time of the sensor failures (and subsequent repairs), the time and results of sensor calibrations, the time of sensor replacements, and the time that backup sensor systems were initiated to provide the required data. It must also contain the name of the person responsible for the sensor work.

Install sensors that are capable of collecting parameters within the specified accuracies and resolutions indicated in the following subparagraphs and transmit these parameters to the DQM database. Transmit all data in JSON message bundles. Each bundle can contain multiple message types. Transmit sensor data as work event messages, and transmit data which relates to the operational state of the dredge or its sensors as state event messages. (See paragraph PARAMETER TRANSMISSION TO THE WEB

SERVICE.)

3.1.1 Message Bundle Data

Every message bundle must contain descriptive data that relates the message to a given dredge plant and date/time. Identify the start of a message bundle by the tag "DQM_data".

3.1.1.1 Messages

Messages contain operational data that populates the DQM database for a dredge plant. A message must consist of an event type and its associated data (as defined in paragraph DREDGE EVENTS), a date/time stamp indicating when the event occurred or started, and a comment providing clarification

SECTION 35 20 23.33 38 Page 4 or metadata about the situation. There are multiple event types, but they all fall into one of two categories - work events and state events.

3.1.1.1.1 Message Time

In a work event message, message time is the date and time that the data is collected from the sensors; in a state event message, message time is the date and time that the state event begins. Report the message time to the nearest second and reference it to Coordinated Universal Time (UTC) time based on a 24-hour format ( YYYY-MM-DD HH:MM:SS). In order to ensure accuracy and reliability, synchronize the time stamp to UTC format from an accurate, unchangeable source (for example, a GPS National Marine Electronics Association NMEA datastring). Identify message time by the tag "msg_time".

3.1.1.1.2 Comment

Comments concerning the work event or state event messages being transmitted provide descriptive information that relates to the data. An example of a comment for work event data is information about a sensor issue; an example of a comment for state event data is a description of operations. Identify a comment by the introductory tag "comment", and limit it to no more than 250 characters.

3.1.1.2 Dredge Events - Work Event

There are two types of dredge event messages - work event messages and state event messages. Work event messages contain data that are instantaneously collected or calculated from sensors and are logged as a series of events. Work events are triggered by a time interval change (as described in paragraph WORK EVENT MESSAGES). Initiate all work event messages by the header tag "work_event".

3.1.1.2.1 Vertical Correction

Obtain the variation of the water level from the vertical datum for the river stage or tidal gage described in the state events using appropriate equipment to give the water level with an accuracy of +/- 0.1 ft. Enter vertical correction values above project datum described in the dredging specification with a positive sign and those below with a negative sign.

The tag for vertical correction is "vert_correction".

3.1.1.2.2 Cutter/Suction Head Location and Movement

Monitor the X, Y, and Z components of the cutter/suction head location.

Additional calculations made from the observed values determine the rates of movement to track the progress of the dredge.

3.1.1.2.2.1 Cutter/Suction Head Horizontal Position

Obtain the forwardmost point of the cutter/suction head using a positioning system operating with a minimum accuracy level of 3-10 feet horizontal Circular Error Probable (CEP). Report it as Latitude/Longitude WGS 84 in decimal degrees with West Longitude and South Latitude values reported as negative. Identify position values by the tags "ch_latitude" and "ch_longitude".

SECTION 35 20 23.33 38 Page 5

3.1.1.2.2.2 Cutter/Suction Invert Depth

Cutter/suction invert depth is the depth of the invert of the suction mouth relative to the surface of the water. Instrumentation must be capable of reporting to an accuracy of +/- 0.5 foot and a resolution to the nearest 0.1 foot with no tidal adjustments. Minimum accuracies are conditional to relatively calm water. Use the tag "ch_depth" to identify the cutter/suction head depth.

3.1.1.2.2.3 Cutter/Suction Head Heading

The cutter/suction head heading is the angle of the centerline of the cutter/suction head and dredge ladder measured relative to true north.

Provide all headings using industry-standard equipment. The heading must be accurate to within 5 degrees and reported to the nearest whole degree with values from 000 (true north) to 359 degrees referenced to a clockwise positive direction convention. Use the tag "ch_heading" to identify the cutter/suction head heading.

3.1.1.2.3 Dredge Activity

Monitor dredge activity using a combination of the following parameters.

3.1.1.2.3.1 Slurry Velocity

Slurry velocity is not a mandatory field for the Small Business profile;

however, if the dredge is outfitted with a velocity meter, then it is expected that velocity data will be included within the DQM string and will meet the standard DQM requirements outlined below.

Use a flow-metering device, calibrated according to the manufacturer's specifications, to record the slurry velocity to the nearest 0.01 fps with an accuracy of + 0.5 fps. If the manufacturer does not specify a frequency of recalibration, conduct calibration prior to the commencement of work.

Measure the slurry velocity for the same pipeline inside diameter as that used for the slurry density measurement. Associate the tag "slurry_velocity" with this value.

3.1.1.2.3.2 Slurry Density

Slurry density is not a mandatory field for the Small Business profile;

however, if the dredge is outfitted with a density meter, then it is expected that density data will be included within the DQM string and will meet the standard DQM requirements outlined below.

Use a density-metering device, calibrated according to the manufacturer's specifications, to record the slurry density to the nearest 0.01 g/cc. It is understood that the accuracy of this sensor can vary based on several factors, including the type of material, the magnitude of the cut, and the length of time since calibration. If the manufacturer does not specify a frequency of recalibration, conduct calibration prior to the commencement of work. Continuous monitoring of this sensor ensures that drift and other factors inherent in the dredging process can be accounted for in monitoring dredge activity. Associate the tag "slurry_density" with this value.

SECTION 35 20 23.33 38 Page 6

3.1.1.2.3.3 Pump RPM

The pump rpm is the number of revolutions per minute measured for the slurry pump shaft. Measure the shaft revolution rate (rev/min) with the highest level of accuracy that is standard on the vessel's operational displays either at the bridge or in the engine room. Identify this value by the tag "rpm".

3.1.1.2.3.4 Pump Vacuum

Measure the vacuum pressure of the dredge pump(s) (inches of mercury) as near to the eye as practicable in the pump's suction pipe with the highest level of accuracy that is standard on the vessel's operational displays either at the leverman's controls or in the engine room. Identify vacuum pressure by the tag "vacuum".

3.1.1.2.3.5 Pump Outlet Pressure

Measure the pump outlet pressure in the discharge line on the pump side of the flap valve in terms of pounds per square inch (psi) on a gauge. Report the pump outlet pressure with the highest level of accuracy that is standard on the vessel's operational displays either at the leverman's controls or in the engine room. Identify the pump outlet pressure by the tag "outlet_psi".

3.1.1.2.4 Outfall Information (Open Water/Spill Barge Placement

Monitor the X and Y position of the terminal end of the outfall pipe continuously and report the position as part of the work event string.

3.1.1.2.4.1 Discharge Horizontal Position

Obtain the horizontal position of the outfall end of the discharge pipe using a positioning system operating with a minimum accuracy level of 3-10 feet horizontal Circular Error Probable (CEP). Report it as Latitude/Longitude WGS 84 in decimal degrees with West Longitude and South Latitude values being reported as negative. Identify position values by the tags "outfall_latitude" and "outfall_longitude".

3.1.1.3 Dredge Events - State Event

In addition to real-time work event messages, submission of "state data" is also required. State data provides information about the current state of the dredge equipment or operations. It is submitted daily through the DQM Contractor Management Site (https://retool.usace.army.mil/) from the first day of dredging activity on a contract through the final day. State data collected includes, but is not limited to, contract information, pipeline length and outfall information, dredge advance, coverage and volume estimates, and non-effective event information.

3.2 NATIONAL DREDGING QUALITY MANAGEMENT PROGRAM SYSTEM REQUIREMENTS

The Contractor's DQM system must be capable of collecting and transmitting data to the DQM system. Record the applicable parameters from paragraph REQUIREMENTS FOR REPORTED DATA as local events and transmit continuously to the DQM database anytime an Internet connection is available.

To accomplish this transmission, send data directly to DQM's web endpoint as outlined in the following paragraph, DIRECT DATA TRANSMISSIONS TO THE

SECTION 35 20 23.33 38 Page 7

DQM WEB SERVICE.

3.2.1 Direct Data Transmissions to the DQM Web Services

Use a web service to report sensor data to the DQM database. Transmit data as it is collected in real time and push it to the DQM web service. If the web service is not available or returns an error message, store the data in a queue and transmit it upon re-establishment of the connection, starting with the oldest data in the queue and continuing until real-time transmission is restored.

Contact dqm-support@usace.army.mil to obtain the web service URL and the appropriate key credentials and communication protocol.

A display of the raw data being transmitted to DQM must be easily accessible and visible onboard the dredge.

3.2.2 Internet Access

Maintain an Internet connection capable of transmitting real-time data to the DQM server as well as enough additional bandwidth to clear historically queued data when a connection is re-established. If connectivity is lost, queue and transmit unsent data upon restoration of connectivity. Delays in pushing real-time data to the DQM database should not exceed four hours. Exceptions to these requirements may be granted by the DQM Support Center on a case-by-case basis with consideration for contract-specific requirements, site-specific conditions, and extreme weather events.

Acquire and install all necessary hardware and software to make the Internet connection available for data transmission to the DQM web service. Configure the hardware and software to allow the DQM Support Center remote access to this computer. The telemetry system must be capable of meeting these minimum reporting requirements in all operating conditions.

In areas with poor cellular service and at the local District's discretion, it may be required to manually download the data on a daily basis using the protocol for retrieving and submitting backup files provided by the DQM Support Center. This method of data transmission should be used only if Internet connectivity is unavailable at the dredging site, and it should be considered a temporary measure.

3.2.3 Data Routing Requirements

Onboard sensors continually monitor dredge conditions, operations, and efficiency and route this information to the shipboard dredge-specific system (DSS) computer to assist in guiding dredge operations.

Digitally log and transmit information regarding changes in the state of the dredge as close to the time of the occurrence as possible. These events can be entered online in the DQM State Data Tool.

3.3 DREDGE MONITORING DATA

3.3.1 General

Onboard sensors continuously collect dredging data in support of the

SECTION 35 20 23.33 38 Page 8 dredge Contractor's operations. Store and transmit portions of this Contractor-collected information, as described in this specification, and calculations based on them to the DQM database on a near real-time basis.

Additionally, digitally log and transmit information regarding the state of the dredge.

3.3.2 Data Measurement Frequency

The frequency of data transmission is dependent on the type of message being sent. Work Event messages contain data that are instantaneously collected or calculated from sensors and are logged as a series of events.

State event messages are activated by a change in the dredge state.

3.3.2.1 Work Event Messages

Log data as a series of events. Each event must consist of a dataset containing dredge information (as defined in paragraph REQUIREMENTS FOR REPORTED DATA). Consider each set of measurements (for example, time and position) an event, with a 6-12 second interval between work events. This interval must remain consistent across event types for the dredge plant.

Record a standard data string within one second of an event trigger with the time stamp and all parameters reflecting when the event happened.

3.3.2.2 State Event Messages

Consider a set of descriptive information (event name, time, description, comment) a state event. Record these events within 24 hours of a change in state with the time stamp reflecting when the event happened.

3.3.3 Parameter Transmission to the Web Service

Format the data as JSON (JavaScript Object Notation, as defined at http://www.json.org) strings of arbitrary length. These JSON strings represent a hierarchical data structure consisting of a message bundle which may contain 0-3 automatic data messages and any number of manual data messages.

A tag/parameter is reported only when it contains a value. Do not include "Null" value strings in a message bundle.

Message bundle

"DQM_Data": { "plant_identifier": <integer value 0000-999>, "transmission_time": <24-hour UTC time YYYY-MM-DD HH:MM:SS>, "messages":

"work_event": { "msg_time": <24-hour UTC time YYYY-MM-DD HH:MM:SS>, "vert_correction": <floating point 100th decimal place>, "ch_latitude": <decimal to 6 decimal places>, "ch_longitude": <decimal to 6 decimal places>, "ch_depth": <floating point 100th decimal place>, "ch_heading": <integer value 000-359>, SECTION 35 20 23.33 38 Page 9

"slurry_velocity": <floating point 100th decimal place>, "slurry_density": <floating point 100th decimal place>, "pump_rpm": <integer>, "vacuum": <floating point 100th decimal place>, "outlet_psi": <floating point 100th decimal place>, "comment": <string>}, "outfall_position": { "msg_time": <24-hour UTC time YYYY-MM-DD HH:MM:SS>, "outfall_location": <string-"upland", "beach", "scow", "open water"> "outfall_latitude": <decimal to 6 decimal places>, "outfall_longitude": <decimal to 6 decimal places>, "outfall_heading": <integer value 000-359>, "outfall_elevation": <floating point 10th decimal place>, "comment": <string>

"non_eff_event": { "msg_start_time": <24-hour UTC time YYYY-MM-DD HH:MM:SS>, "msg_end_time": <24-hour UTC time YYYY-MM-DD HH:MM:SS>, "function_code": <string - 1 to 4 characters>, "comment": <string>

3.3.4 Contractor Data Backup

Maintain an archive of all data sent to the DQM Support Center during the dredging contract. The COR may require, at no increase in the contract price, that the Contractor provide a copy of these data covering specified time periods. Provide the data in the same JSON format as would have been transmitted to the DQM computer. There must be no line breaks between the parameters, and each record string must be on separate line. The naming convention for the files must be < dredgename>_<StartYYYYMMddhhmmss>_< EndYYYYMMddhhmmss>.txt.

Data submission must be via a storage medium acceptable to the COR.

At the end of the dredging contact, call the National DQM Support Center prior to discarding the data. The DQM Support Center will verify that all data has been received and appropriately archived before giving the Contractor discard permission. Record the following information in a separate section at the end of the dredge's onboard copy of the DPIP:

- Person who called the National DQM Support Center

- Date of the call

- DQM representative who gave permission to discard the data

3.4 PERFORMANCE REQUIREMENTS

The Contractor's National Dredging Quality Management Program's data transmission must be fully operational at the start of dredging

SECTION 35 20 23.33 38 Page 10 operations. To meet contract requirements for operability, the Contractor's system must provide an accurate data string return and be compliant with hardware requirements. Data string return is defined as the number of quality records within an event or state tag sent by the contractor's system to the DQM database. Quality data strings are considered to be those providing accurate values for all parameters reported when operating according to the specification. Make repairs necessary to restore data return compliance within two business days, or submit a plan and timeline for repair if the repair will take more than two business days. Failure by the Contractor to report quality data within the specified time window for dredge measurements as stated in the specifications (see paragraphs INTERNET ACCESS, DATA MEASUREMENT FREQUENCY, and PARAMETER TRANSMISSION TO THE WEB SERVICE), will result in withholding of up to 10% of the contract progress payment per FAR clause 52.232-5.

3.5 LIST OF ITEMS TO BE PROVIDED BY THE CONTRACTOR

- DPIP https://dqm.usace.army.mil

- DQM System Paragraph NATIONAL DREDGING QUALITY MANAGEMENT PROGRAM SYSTEM REQUIREMENTS, including all subparagraphs

- Dredge Data Paragraph DREDGING MONITORING DATA

-- End of Section --

SECTION 35 20 23.33 38 Page 11

APPROXIMATE BEGINNING POINT

FOR BEACH PLACEMENT

N: 60195.66 E: 2235042.20

NOTES

SLOPE INTERCEPT15% OR NATURAL SLOPE

N.T.S.

SLOPE

INTERCEPT

EXISTING GROUND

N.T.S.

TRANSITION DETAIL

TOP OF BERM +6.0' NAVD 88

TIE INTO EXISTING

6' NAVD 88 CONTOUR

OR EXISTING GROUND

ELEVATION

500'

TIE INTO EXISTING

6' NAVD 88 CONTOUR

OR EXISTING GROUND

ELEVATION

500'

MIN. 100' WIDE

CONSTRUCTION

BERM

MIN. 100' WIDE

CONSTRUCTION

BERM

MIN. 100'

TYPICAL BEACH PLACEMENT SECTION

3000' APPROXIMATE LIMITS OF PLACEMENT AREA

Feet

10005000 250

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1. PHOTOGRAPHY DATE: OCTOBER 31, 2025 © 2025 VANTOR .

2. THE PIPELINE ROUTE SHOWN IS APPROXIMATE. THE CONTRACTOR MUST COORDINATE WITH ALL PARTIES TO DETERMINE THE FINAL PIPELINE

ROUTE BEFORE WORK BEGINS. THE FOLLOWING ACTIONS ARE REQUIRED:

2.A. MEET ON-SITE WITH THE CONTRACTING OFFICER OR HIS/HER REPRESENTATIVE AND A REPRESETATIVE FROM THE NORTH CAROLINA WILDLIFE RESOURCES COMMISSION 15 CALENDAR DAYS BEFORE WORK BEGINS TO DETERMINE THE PIPELINE ROUTE AND EXACT STARTING

POINT FOR BEACH MATERIAL PLACEMENT.

2.B. CONTRACTOR SHOULD NOTIFY THE TOWN OF OAK ISLAND (MR DAVID KELLY, TOWN MANAGER, 910-201-8002) NO LESS THAN 15 DAYS BEFORE

PIPELINE PLACEMENT BEGINS.

3. THE EXACT BEGINNING POINT FOR PLACEMENT OF DREDGED MATERIAL ON THE BEACH WILL BE ESTABLISHED BY THE CONTRACTING OFFICER OR HIS/HER DESIGNATED REPRESENTATIVE IMMEDIATELY PRIOR TO START OF DREDGING AND BEACH PLACEMENT OPERATIONS.

4. HORIZONTAL DATUM NAD 1983.

5. VERTICAL DATUM NAVD 1988. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ESTABLISHING HORIZONTAL AND VERTICAL CONTROL PRIOR TO

PLACEMENT OF DREDGED MATERIAL IN THE DESIGNATED PLACEMENT AREA.

6. FOR DETAILS OF AREAS TO BE DREDGED, SEE SHEETS CN107 .

7. ALL CONTRACTOR OPERATIONS SHALL BE PERFORMED IN A MANNER THAT AVOIDS DAMAGE TO EXISTING STRUCTURES, AND ROADS.

STRUCTURES AND ROADS DAMAGED BY CONTRACTOR'S OPERATIONS SHALL BE REPAIRED TO THE SATISFACTION OF THE CONTRACTING OFFICER OR HIS/HER DESIGNATED REPRESENTATIVE AT NO COST TO THE GOVERNMENT OR TO THE OWNERS OF DAMAGED PROPERTY. IN ORDER TO MINIMIZE THE RISK OF DAMAGE, WHEELED OR TRACKED EARTH MOVING EQUIPMENT SHALL NOT WORK CLOSER THAN 10 FEET FROM STRUCTURES DURING ALL WORK, INCLUDING DISTRIBUTION AND MOVEMENT OF BEACH FILL MATERIAL. IN AREAS WHERE IT IS NOT POSSIBLE TO TIE INTO THE 6-FOOT CONTROUR, THE CONTRACTOR SHALL CONSTRUCT THE BACKSLOPE TO THE NATURAL ANGLE OF REPOSE.

8. ALL WORK ON THE BEACH, INCLUDING PIPE REMOVAL, SHALL BE COMPLETED BY 31 MARCH 2027, SEE PARAGRAPH ENVIRONMENTAL WINDOWS OF SECTION 01 57 19 OF THE SPECIFICATIONS FOR ENVIRONMENTAL WINDOWS AND RESTRICTIONS. NO ENVIRONMENTAL WINDOW EXTENSION

WILL BE GRANTED.

9. STAGING OF MATERIAL OR EQUIPMENT WILL NOT BE PERMITTED ON THE NORTH SIDE OF TANGENT 11 BETWEEN THE TWO PIERS AT

APPROXIMATELY STATIONS 10+00 TO STATION 40+00.

10.CONTRACTOR SHALL POST SIGNS AND TEMPORARY FENCES IN AND AROUND ACTIVE ONSHORE WORK AREAS IN ACCORDANCE WITH

SPECIFICATION 01 35 26.

11.SURVEYS FOR PLACEMENT ARE REQUIRED PER SPECIFICATION SECTION 02 21 00.

12.NATURAL SLOPE FOR BEACH PLACEMENT IS DEFINED AS SLOPE RESULTING FROM THE EFFECTS OF WAVE AND WATER LEVEL CONDITIONS.

AREA TO BE DREDGED

LEGEND

OPTIONAL AREA TO BE DREDGED

TANGENT 7

TANGENT 8

TANGENT 9

TANGENT 10

TANGENT 11

TANGENT 12

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APPROXIMATE LOCATION OF PIPELINE ROUTE

SCALE 1"=150'

3000'

APPROXIMATE LIMITS OF

PLACEMENT AREA FILL

MATERIAL SHALL BE PLACED

DOWN THE BEACH AT THE

DESIGNATED BEACH

PLACEMENT WIDTH UNTIL

MATERIAL TO BE DREDGED IS

EXHAUSTED. WIDTH OF

TYPICAL BEACH PLACEMENT

SECTION MAY BE ADJUSTED

AT THE DISCRETION OF THE

C.O.R.

APPROXIMATE LOCATION

OF PARTIALLY EXPOSED

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CN106

APPROXIMATE LOCATION

OF PARTIALLY EXPOSED

ABANDONED 12 "

WATERLINE.

N: 62,737 E: 2,232,239

SEE SHEET R-1

12" WATERLINE

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20 20

202020

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25 2525 25

252530

30 303030

303030 35 35

35 40 40

40 40

2020 2020

20 2020

20 20 2020 20

20 20

EXISTING DAMAGED SPILLWAY

STRUCTURE AND OUTFALL PIPE

TO BE PROTECTED DURING

DREDGING OPERATIONS.

PROTECTION SHALL BE REMOVED

POST-CONSTRUCTION.

APPROXIMATE COORDINATES:

N: 297997.5116 E: 2504277.0243

AS WATER FILTERS FROM SLURRY MIX

TOWARDS DOWNSTREAM END OF

CONFINED UPLAND SITE, CONTRACTOR

SHALL DEWATER SITE TO MAINTAIN 2' OF

FREEBOARD FROM THE TOP OF DIKE.

AFTER COMPLETION OF DREDGING

OPERATIONS, CONTRACTOR SHALL

DEWATER SITE TO ENSURE BRACKISH

WATER WILL NOT FLOW OUT OF EXISTING

SPILLWAY PIPE.

NOTES

1. HORIZONTAL DATUM: NORTH CAROLINA STATE PLAN NAD83 (2011) US SURVEY FEET.

2. VERTICAL DATUM: NAVD88

3. CONTOUR INTERVAL IS ONE FOOT, UNLESS OTHERWISE NOTED.

4. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ESTABLISHING HORIZONTAL AND VERTICAL CONTROL. AVAILABLE CONTROL POINTS IN THE VICINITY OF PLACEMENT AREA CAN BE FOUND AT THE INTERNET SITE: http://www.ngs.noaa.gov/NGSDataExplorer/.

5. THE EXISTING CONTOURS SHOWN REPRESENT THE RESULT OF 2019 LIDAR.

6. CLEARING AND GRUBBING SHALL BE ACCOMPLISHED IN ACCORDANCE WITH SECTION 31 11 00.10 "CLEARING" OF THE

SPECIFICATIONS.

7. WETLANDS LOCATED AROUND THE PERIMETER OF THE PLACEMENT AREA ARE PROTECTED BY LAW. EXCAVATION AND/OR FILLING OF WETLANDS WILL NOT BE ALLOWED. WETLANDS DAMAGED BY THE CONTRACT'S OPERATION SHALL BE RESTORED TO THE SATISFACTION OF THE CONTRACTING OFFICER OR HIS/HER DESIGNATED REPRESENTATIVE. RESTORATION SHALL ONLY COMMENCE FOLLOWING DIRECTION FROM THE CONTRACTING OFFICER OR HIS/HER DESIGNATED REPRESENTATIVE.

8. GROUND DISTURBANCE (EARTHWORK) IS PROHIBITED BETWEEN THE TOE OF THE EXISTING DIKE AND MILE HAMMOCK BAY

DUE TO ARCHEOLOGICAL RESTRICTIONS. SEE SHEET R-2 FOR REFERENCE.

9. CONTRACTOR SHALL CLEAR NO WIDER THAN A 12-FOOT LANE, UNLESS APPROVED BY THE COR, ALONG THE TOP OF THE

EXISTING DIKE TO ALLOW FOR INSPECTION OF DIKE DURING DREDGING.

10. CONTRACTOR MAY CLEAR A LANE, NO WIDER THAN 10' UNLESS APPROVED BY THE COR, FOR DREDGE PIPE TO DISCHARGE

INTO NORTHWEST CORNER OF CONFINED UPLAND SITE.

11. CONTRACTOR SHALL PROTECT THE EXISTING OUTFALL PIPE DURING DREDGING OPERATIONS TO PREVENT BRACKISH WATER FROM FLOWING THROUGH OVERLAND AND TO ENSURE STABILITY OF THE DIKE DURING PLACEMENT OF DREDGED MATERIAL.

CONTRACTOR SHALL REMOVE PROTECTION FOLLOWING CONSTRUCTION TO ALLOW STORMWATER TO FREELY FLOW OUT OF CONFINED PLACEMENT SITE. AN EXAMPLE OF PROTECTION OF THE OUTFALL PIPE IS TO SEAL THE INLET OF THE PIPE AND

GROUT THE PERIMETER OF THE PIPE AT THE DIKE WALL.

12. CONTRACTOR SHALL DEWATER CONFINED UPLAND SITE DURING AND AFTER DREDGING OPERATIONS AND RETURN WATER TO MILE HAMMOCK BAY. RETURN WATER MUST MEET TURBIDITY REQUIREMENTS IN ACCORDANCE WITH SECTION 01 57 19 OF THE SPECIFICATIONS. CONTRACTOR WILL SUBMIT A DEWATERING PLAN TO THE CONTRACTING OFFICER OR HIS/HER REPRESENTATIVE. DEWATERING OPTIONS CAN INCLUDE BUT ARE NOT LIMITED TO USING PUMPS AND GEOTUBES, FLOATING PUMPS, OR CREATING A TEMPORARY WEIR/DECANTING SYSTEM AND PUMPING THE WATER INTO THE BAY.

13. CONFINED UPLAND SITE IS PROPERTY OF MARINE CORPS BASE CAMP LEJEUNE

14. SURVEYS FOR CONFINED UPLAND SITE ARE REQUIRED PER SPECIFICATION SECTION 02 21 00.

15. NO CONTRACTOR PERSONNEL SHALL ENTER THE WORK AREA UNTIL MCBCL EOD HAS BEEN NOTIFIED AND PERFORMED A CLEARANCE OF THE AREA. CONTRACTOR TO COORDINATE WITH COR AT LEAST 15 DAYS PRIOR TO ARRIVAL.

16. ALL DREDGING IN MILE HAMMOCK BAY SHALL BE COMPLETED BETWEEN OCTOBER 1, 2026 AND MARCH 31 2027. ALL TREE CLEARING WILL TAKE PLACE BETWEEN JULY 16, 2026 AND DECEMBER 14, 2026 OR FEBRUARY 16, 2027 AND MARCH 31, 2027 SEE PARAGRAPH ENVIRONMENTAL WINDOWS OF SECTION 01 57 19 OF THE SPECIFICATIONS FOR ENVIRONMENTAL WINDOWS

AND RESTRICTIONS.

FEET

2001000 50

SCALE = 100' CN109

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AREA TO BE CLEARED

MAJOR CONTOUR15

LEGEND

MINOR CONTOUR14

PROPOSED PIPELINE ROUTE

CLEAR 10' LANE AS NEEDED

CLEAR 12-FOOT LANE ALONG TOP OF DIKE

DEWATERING SHALL MAINTAIN 2-FT OF FREEBOARD AT ALL TIMES

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3.1.1.3 Dredge Events - State Event