A21 - SOW CBI VC_20260303.pdf

STATEMENT OF WORK (SOW)

Carolina-Kure Beach CSRM, Carolina Beach Inlet and Vicinity

2026 Subsurface Investigation and Geotechnical Laboratory Testing New Hanover County, North Carolina

March 3, 2026

I. GENERAL REQUIREMENTS

General.

The Contractor shall furnish all services, labor, equipment, supplies, tools and incidentals necessary to perform vibracore sampling, development of drilling logs, laboratory testing of soils, and other services as specified herein. The location of the work is within the vicinity of Carolina Beach Inlet, New Hanover County, NC (Figure 1). This work consists of drilling 27 x borings within the Carolina Beach Inlet Borrow Area (Figure 2) and the adjacent tidal delta (Figure 3) to facilitate potential expansion of the borrow area for future nourishment activity. Dredging of the borrow area is presently underway (contract W912PM25CA0004) and is scheduled to be completed by May 2026. All work within this SOW shall be completed within 180 days of contract award.

A total of 13 x waterborne vibracore and 2 x land-based borings shall be drilled within the Carolina Beach Inlet Borrow Area (Figure 2). A total of 12 x waterborne vibracores shall be drilled within the adjacent tidal delta (Figure 3). Within the borrow area, the bathymetry ranges from about 0 ft. to -38 ft.

MLLW. Shoaling is most prevalent within the tidal delta, which has a bathymetric range of 0 ft. to -5 ft.

MLLW. All vibracores shall be drilled and sampled in 20-foot lengths (see “Vibracore and Land-Based Drill Sampling”). Two land-based borings are located on the southern accretionary spit that is exposed above the waterline and has extended into the borrow area. Elevation of the spit ranges from +5.5 to +7.5 feet MLLW. The land-based borings shall be drilled and sampled to elevation -40 ft. MLLW.

Coordinates and elevation details for all borings are provided in Table 1.

Portions of the Carolina Beach Inlet Borrow Area have been dredged to -40 feet MLLW, however, this depth is not uniform, and certain areas have been under sampled. For the current contract (W912PM25CA0004) USACE has designated dredge cut zones with vertical limits to guard against dredging unsuitable material. Subsurface sampling and testing will be used to verify subsurface conditions below the vertical limits of these dredge cuts and to maximize future beach nourishment dredging to -40 ft. MLLW. The current beach nourishment contract (W912PM25CA004) will conclude by May 2026, and it is expected that most of the dredge cuts shown in Figure 1 should be dredged to the designated elevation. Table 1 contains the projected maximum sampling elevations for the borings.

Responsibility The Contractor shall furnish qualified personnel to ensure the accomplishment of work specified in this SOW. Additionally, the Contractor shall furnish all services, equipment, personnel, and travel required in connection with this SOW. The Contractor is responsible for maintaining the submittal timeline outlined in Table 2.

Direction The Contractor shall accept directions only from the Wilmington District Contracting Officer (KO), Ms.

Rosalind Shoemaker (910-251-4436) or her designee. Requests or desires of the Users, Using Agency, or any other party made directly to the Contractor shall be immediately brought to the attention of the KO for this Contract. Any changes to this SOW must be authorized in writing by the KO.

Coordination The Contracting Officer’s Representative (COR) is Mr. Walter Haven, P.G. (910‐251‐4495) and he shall be the Contractor’s point of contact (POC) for all submittals and timeline execution. The technical point of contact is Mr. Kelley Kaltenbach, P.G. (910-251-4623). At least one meeting between the Contractor’s project manager and Wilmington District personnel shall be held weekly to discuss the Contractor’s progress and Wilmington District’s technical review of submittals.

The Contractor shall designate a project manager who shall be the principal point of contact for the Wilmington District in administering this contract. The Contractor's project manager shall be responsible for all coordination to ensure the work is accomplished in a professional manner. Any directions given that are viewed by the Contractor as a change to the SOW affecting contract fee or time shall be brought to the immediate attention of the KO or the COR.

The COR and technical POC mail and email information are provided below:

Walter T. Haven, P.G.

Walter.T.Haven@usace.army.mil U.S. Army Corps of Engineers Wilmington District Attn: Walter Haven 69 Darlington Avenue Wilmington, NC 28403‐1343

Kelley J. Kaltenbach, P.G.

Kelley.J.Kaltenbach@usace.army.mil U.S. Army Corps of Engineers Wilmington District Attn: K.J. Kaltenbach 69 Darlington Avenue Wilmington, NC 28403‐1343

II. STATEMENT OF SERVICES

Description of Work.

The Contractor shall perform a total of 25 waterborne vibracores, 2 land-based borings, and 207 lab test samples for this project. All coordinates and pertinent boring elevations are provided in Table 1.

Following drilling operations, the Contractor shall carefully transport the core samples to a facility for processing. The soil cores shall be processed and field logs and photos provided to the COR. Following the receipt of the preliminary boring logs and photos, The Wilmington District will require at least 5 business days to review the logs and photographs to assign lab test sampling intervals.

All borings (vibracore and land-based borings) shall be horizontally referenced to North American Datum (NAD) 1983 North Carolina State Plane Feet. The top and bottom of each boring shall be referenced to the MLLW vertical datum. Sampling procedures for all borings shall be accomplished in accordance with paragraph “Vibracore and Land-Based Drill Sampling.” Preliminary Drilling Logs, Draft and Final Drilling Logs for all borings shall be accomplished in accordance with paragraph “Drilling Logs.” In addition to the Preliminary Draft and Final Drilling Logs, the Contractor shall take detailed photographs of each boring to highlight changes in soil character. Laboratory testing on USACE-designated samples shall be accomplished in accordance with the paragraph “Laboratory Testing Procedures.”

Performance Period.

The Contractor shall mobilize to the site and begin drilling within 5-calendar days following SAW acceptance of the Accident Prevention Plan (APP). The entire work, including drilling, logging, photographing, laboratory analyses, and the Final Report (hard copy and electronic files) should be submitted within 180 calendar days from time of award.

mailto:Walter.T.Haven@usace.army.mil mailto:Kelley.J.Kaltenbach@usace.army.mil

USACE Furnished Materials.

Boring coordinates are provided in Table 1. Digital hydrographic survey data are available on request.

An OpenGround database, which includes the OpenGround core log template, shall be used to generate the drilling logs and will be furnished after contract award. GIS files of existing vibracores, NOAA charts, and bathymetric data are available on request.

Designated sampling intervals for laboratory testing shall be provided by the Wilmington District, based on the Contractor’s Preliminary Logs and photos. The sample intervals for each boring log will be provided to the Contractor within 5 business days on receipt of the boring and photographic logs.

Vibracore and Land Based Drill Sampling.

The Contractor shall designate vibracores from Carolina Beach Inlet (and Vicinity) as “CBI-26-V-###”, while the land-based borings shall be designated as “CBI-26-B-###.” Vibracores shall be performed within 100 feet (horizontally), yet as close as practicable to the locations provided in Table 1. The land-based borings shall be performed within 50 feet (horizontally) of the locations provided in Table 1.

Vibracore drilling shall be accomplished by vibrating a vertical 3-inch diameter sampling tube to the designated run length (20-feet) as shown in Table 1. Per the South Atlantic Regional Biological Opinion (SARBO) for the Endangered Species Act, the vibracore sampler shall not be operated until the vibracore platform and sampling barrel contacts the seafloor/channel bottom. The vibracore sampler shall not be operated during retrieval operations (SARBO, 2020). The recovered sediments in each vibracore should not be less than 75% of penetration/drive length unless the collected vibracore encounters refusal. To document vibracore refusal, penetrometer data collection shall be recorded and presented to verify vibracore refusal. Vibracore refusal is defined as the sampling barrel having a penetration rate of less than 0.2 feet over a 30-second period. If vibracore refusal is encountered at the seabed, the Contractor shall offset up to 20 feet and conduct an additional vibracore attempt at a separate location within 20 horizontal feet of the original point. Location information and refusal depth shall be recorded for each location where refusal is encountered.

Land-based drilling shall be conducted in such a manner to provide a relatively continuous sampling of the subsurface strata from the top of hole elevation to the termination elevation of -40 feet MLLW. The sampling barrel (or similar) may be advanced by high frequency, resonant energy/vibration, by percussion, or by conventional drilling means. Sampling barrels may be in 1.5-, 5-, 10-, or 20-foot increments, pending the configuration of the drilling equipment. Refusal and offset criteria shall be similar as vibracore drilling. Overland access to the south spit is available using the Freeman Park 4x4 Beach Access. The Contractor shall coordinate access with Carolina Beach Parking, located at 1708 Canal Dr, Carolina Beach, NC 28428, phone 910-458-4614.

Life safety concerns encompass issues or situations directly jeopardizing physical safety and well-being.

Given the dynamic nature of the project area, which includes factors such as shallow water, tidal influence, shifting shoals, and exposure to swell, if access to a boring location becomes impossible due to life safety concerns, immediate communication between the COR, KO, and the Contractor's project manager is required to assess the need for location abandonment. The Contractor shall initiate communication via phone to the COR and via writing to both COR and KO, detailing the conditions encountered during the attempt to access the respective boring location. Additionally, the Contractor shall coordinate between the vibracore vessel captain, land-based drill crew, the Contractor’s project manager, and the Government to determine the location of an alternate core within the project area.

Conversely, if an alternate location which supports the Government’s project goals is not determined, no alternative boring shall be collected, and the Contractor shall not receive payment for the collection, logging, or photography of that respective boring.

For each drilled boring location, real-time kinematic (RTK) Global Positioning System (GPS) surveying techniques shall be utilized to provide accuracies of 0.2 feet vertically and horizontally. The Contractor shall collect the actual coordinates (Easting and Northing) and top of hole (TOH MLLW) elevation of each boring at the time of drilling. Field Logs not containing proper coordinates and TOH will not be accepted. These are required for the government to determine the number of lab sample picks per core.

Completed borings/vibracores shall be carefully transported for processing, log production, and visual soils classification. A photographic mosaic log depicting the soil strata relative to depth shall be produced for each boring. All borings shall be visually classified and logged in accordance with ASTM D2488 “Standard Practice for Description and Identification of Soils (Visual-Manual Procedure).” The top and bottom of each boring and core photo shall be referenced to MLLW vertical datum. Once the sampled soils are visually classified, the Contractor shall submit the preliminary boring logs, core photographs, and penetrometer records to the Wilmington District. The Wilmington District will review the boring logs and photographs and assign lab test sampling intervals for the Contractor to sub-sample and test.

Drilling Logs.

All drilling logs shall be developed using USACE Bentley OpenGround Cloud configured for the project. USACE will provide necessary permissions to Contractors entering data. If the Contractor does not already have a license for OpenGround Cloud, the Contractor must obtain user-specific "named user" or concurrent licenses. Preliminary boring logs, at a minimum, shall include the date and time when each boring was taken, run time for the boring, the horizontal location of the boring (NAD 1983 North Carolina State Plane Feet), tide-corrected ocean bottom elevation (MLLW), and a visual description of the soil strata in accordance with ASTM 2488-09A. Supplemental information including depths for the entire length of recovered material, core recovery, and refusal depth shall also be denoted. The Wilmington District shall determine the sample intervals to be tested. Following Wilmington District’s sample selections, the Contractor shall designate the samples “S-1, S-2, S-3, etc.…”, with top and bottom depths listed and sent to the laboratory for testing. Once the lab data are compiled, Draft Drilling Logs shall be developed with the necessary information mentioned above and include the laboratory data specified in laboratory testing procedure. Once the Draft Drilling Logs are reviewed and comments are addressed, they will be the Final Drilling Logs and can be submitted as part of the Final Report.

The Contractor shall conduct a QA/QC of the Final Drilling Logs to ensure that the coordinates and TOH elevations are correct, stratigraphic field classifications are consistent and within 1-USCS letter/symbol of the laboratory tested sample, and the graphical symbology utilized reflects the stratum described. The Contractor shall provide a legend or key to soil symbols and terms utilized.

Laboratory Testing Procedures.

Laboratory testing shall be the responsibility of the Contractor. Laboratory tests shall be conducted by a USACE validated soils testing lab. A listing of USACE validated laboratories is available at:

http://www.erdc.usace.army.mil/Media/Fact-Sheets/Fact-Sheet-Article-View/Article/476661/materials-testing-center/.

For estimating purposes, 25 vibracores and 2 land-based borings are to be collected. The maximum number of samples for which laboratory testing is required shall not exceed 207 samples. The exact number of samples per core will be dependent on the materials encountered. Although up to 207 samples could be tested, the Contractor will only be paid for samples that are selected for laboratory testing by the Wilmington District. The Wilmington District shall determine the depth intervals for each test sample based on the Field Logs and photographs. The laboratory test reports shall include the project name, laboratory name, core number, sample identification number, and date each sample was tested.

http://www.erdc.usace.army.mil/Media/Fact-Sheets/Fact-Sheet-Article-View/Article/476661/materials-testing-center/ http://www.erdc.usace.army.mil/Media/Fact-Sheets/Fact-Sheet-Article-View/Article/476661/materials-testing-center/

The final laboratory test results shall be included in the Final Report and on the Draft and Final Drilling Logs.

Three (3) test procedures shall be performed on each sample:

1) ASTM D6913, “Particle‐Size Distribution (Gradation) of Soils Using Sieve Analysis,” modified (for sandy soils) by using the following sieve sizes: 1‐in., 3/8‐in., No. 4, No. 7, No. 10, No. 14, No. 18, No. 25, No. 35, No. 40, No. 60, No. 80, No. 120, No. 170, No. 200, and No. 230.

2) ASTM D2487 “Standard Practice for Classification of Soils for Engineering Purposes (Unified Soils Classification System);” and

3) Visual, volumetric percentage of shell and rock fragment determination. Visual percent shell content and visual percent rock fragment content shall be estimated for the 1-in., 3/8-in., and No.

4 sieve sizes.

Reporting Requirements.

A Draft Report shall be submitted to USACE for review and comment. The Draft Report shall include a description of the work, details of the underlying geology, final core locations on maps and in a table, Draft Drilling Logs, penetration rate records and graphs, core photographic mosaics, and lab test data, complete with gradation tables and curves for each sample tested with a summary table.

The Contractor shall revise the Draft Report, incorporating Wilmington District’s comments. The Contractor shall submit the Final Report to the COR for USACE to review and backcheck that all comments have been appropriately addressed. Once accepted the revised report will become the Final Report.

Once accepted, the Contractor shall furnish one (1) hard copy of the Final Report, electronic/digital files containing the Final Report, all the lab test data in Excel and PDF formats, the USACE Bentley OpenGround database file, and ArcGIS shapefiles, layers, or feature classes showing core locations.

Electronic/digital lab test files shall contain the project name at the top, core number, sample identification number, depth of sample, visual classification, and percentage passing each sieve (highlight #200 sieve), visual percent of rock and shell content, sorting, and the mean and median grain size for each sample.

Cost Proposal.

The Contractor shall submit a detailed cost proposal and a drilling plan to USACE as part of his or her proposal. The detailed cost proposal shall be based on Table 3.

The Contractor’s cost shall assume all sampling and logging (vibracore and land-based borings), all laboratory testing procedures, Final Drilling Logs in USACE Bentley OpenGround format, photographic mosaic logs, penetration rate graphs, a USACE Bentley OpenGround database, an Excel summary spreadsheet of all laboratory data, and a Final Report including Final Drilling Logs and laboratory analyses.

In addition, 6 x vibracores will be requested by the Wilmington District for archiving purposes. For archiving purposes, the vibracores shall be cut into 5-foot segments. The vibracores shall be shipped and delivered to the Wilmington District at the time the hard copy of the Final Report is provided. The costs for shipping vibracores shall be included in the contractor’s cost estimate.

Lastly, the Contractor shall provide details on the daily costs for land-based borings and waterborne vessel operation and number of days required for the drilling effort. The drilling plan shall include a field work schedule with number of borings per day, the type of drilling equipment used, the size of the sampling tubes, the material from which the tubes are made, the size and description of the vessel(s) to be used, the number of boats and crew members, the qualifications of the laboratory performing analyses, and a description of the survey equipment to be used to collect coordinate and elevation data.

The Contractor should account for weather, tide and field site conditions in the cost proposal.

Submittals.

Submittals shall be sent electronically to the KO, COR and Technical POC listed below:

• Rosalind.M.Shoemaker@usace.army.mil (or her designee).

• Walter.T.Haven@usace.army.mil; and

• Kelley.J.Kaltenbach@usace.army.mil.

The Final Report shall be bound and titled; “Carolina-Kure Beach CSRM, Carolina Beach Inlet and Vicinity, 2026 Subsurface Investigation and Geotechnical Laboratory Testing Results” containing all the elements and meeting the requirements herein. One hard copy of the Final Report shall be submitted by the Contractor and deemed acceptable by USACE before final payment is made.

Final Submittals shall be made to the following recipient:

Mr. Walter T. Haven, P.G. (CESAW‐ECP‐EG), Geologist, Geotechnical and Dam Safety Section, 69 Darlington Avenue, Wilmington, NC 28403‐1343.

One hard copy and digital copy of the Final Report shall be provided to Mr. Walter Haven, P.G.

Safety.

Safety of all parties is a major concern. The Contractor shall coordinate the work effort with the U. S.

Coast Guard and comply with all their requirements and requests. The Contractor shall ensure that drilling operations have a minimal effect on navigation by other mariners. The Contractor shall comply with guidance established in the U.S. Army Corps of Engineers Safety Manual, EM 385-1-1, dated March 15, 2024, and any applicable State, Federal, and U. S. Coast Guard regulations. The Contractor shall submit an APP to the Wilmington District for review within 7 calendar days following contract award. The Wilmington District will require a minimum of 7 calendar days to review and provide comments. The Contractor shall revise the APP and resubmit to the Wilmington District for review and acceptance. No field work shall be performed until the plan is accepted by the Wilmington District.

The plan shall follow the guidelines established in EM 385-1-1 to include: the location of the work site;

discussion on what conditions are unfavorable for field work to occur; verified emergency contact information for the local US Coast Guard station(s); evacuation plan to the nearest medical facility;

emergency radio frequencies and telephone numbers; required safety equipment; lockout/tagout requirements and procedures; certified first aid personnel; spill prevention and HAZMAT information;

and an Activity Hazard Analysis. The Contractor shall be responsible for conducting a daily Safety Brief and Risk Assessment prior to commencing work each day. All personnel shall be properly clothed and protected for working on the water. Wilmington District reserves the right to halt drilling operations for any safety violation.

mailto:Rosalind.M.Shoemaker@usace.army.mil mailto:Walter.T.Haven@usace.army.mil

Anti-Terrorism and Operations Security.

1. General security requirements and guidance: The security requirements described below apply to all contract personnel (including employees of the prime Contractor (“Contractor”) and all subcontractor employees) supporting the performance requirements of this contract. The Contractor is responsible for compliance with these security requirements. Questions regarding security matters shall be addressed to the designated Government representative (e.g., Contracting Officer Representative (COR), Requiring Activity (RA) representative, or Contracting Officer (if a COR or other RA representative is not appointed). Contract personnel are critical to the overall security and safety of US Army Corps of Engineers (USACE) installations, facilities and activities, and security awareness training contributes to those efforts. The Department of Defense (DoD) and Army security training requirements specified below, if applicable, are performance requirements; all applicable contract personnel shall complete initial training within 30 days of contract award or the date new contract personnel begin performance on the contract. Within five business days from the completion of training, the Contractor shall provide written documentation (e.g., email or memorandum) to the Government representative. The documentation shall include the names of contract personnel trained and which training they completed; the Contractor shall maintain training records as part of their contract files and be prepared to provide copies of training certificates to the Government representative. Contractor personnel and vehicles are subject to search when entering federal installations. Additionally, all contract personnel shall comply with Force Protection Condition (FPCON) measures, Random Antiterrorism Measures (commonly referred to as “RAMs”), and Health Protection Condition (HPCON) measures. The Contractor is responsible for meeting performance requirements during elevated FPCON and/or HPCON levels in accordance with applicable RA plans and procedures -- this includes identifying mission essential and non-mission essential personnel. In addition to the changes otherwise authorized by the changes clause of this contract, should the FPCON or HPCON levels at any individual facility or installation change, the Government may implement security changes that affect contract personnel. The Contractor shall ensure all contract personnel are aware of their security responsibilities, including any site-specific requirements identified in local policies or procedures.

14. Pre-screen candidates using E-Verify Program: Contractors shall comply with the requirements set forth in FAR clause 52.222-54 Employment Eligibility Verification and FAR Subpart 22.18 in using the E-Verify Program at (https://www.e-verify.gov/) (website subject to change) to meet the contract employment eligibility requirements. Contractors are encouraged to cooperate with Federal and State agencies responsible for enforcing labor requirements to include eligibility for employment under United States immigration laws in accordance with FAR 22.102-1(i). An initial list of verified/ eligible candidates shall be provided to the COR no later than three business days after the initial contract award. When contracts are with individuals, the individuals will be required to complete a Form I-9, Employment Eligibility Verification, and submit it to the Contracting Officer to become part of the official contract file.

Payment Process The Contractor may submit invoices to the COR for work that has been completed. The invoice will be reviewed and verified by the KO and the COR. The Contractor shall submit payment requests in accordance the line items shown in Table 3.

Request for Payment.

The Contractor shall provide a copy of the invoice on completion of agreed services. The invoice shall be provided through the US Postal Service or email, to the Technical Point of Contact or the Contracting Officer’s Representative (POC/COR). The Contractor shall ensure that the following are included on the invoice:

• Contract #

• Invoice #

• Company Name

• Invoiced Line Item(s) must match the Contract Line Item(s)

• Small Business, Veteran Owned, or 8A – If applicable, indicate on invoice

Table 1. Carolina Beach Inlet & Vicinity, Core ID, coordinates, and details.

Core ID Easting

NAD83

NCSP-Ft

Northing

NAD83

NCSP-Ft

Max Core Length

(Ft)

JAN 2026

Bathy

TOH EL

MLLW

(Ft)

Contract Dredge Cut

EL MLLW

(Ft)

Terminal Elevation Range (Max*) MLLW

(Ft)

Carolina Beach Inlet Borrow Area Jan-26 Projected

CBI-26-V-001 2338880.25 121185.47 20 -19.0 -35 -39.0 -55.0

CBI-26-CS-

002 2340224.29 121485.61 45 4.5 Not Dredged -40.0 -40.0

CBI-26-CS-

003 2340434.73 121534.92 43 2.7 Not Dredged -40.0 -40.0

CBI-26-V-004 2340163.85 121818.50 20 -11.6 -35 -31.6 -55.0

CBI-26-V-005 2340117.28 122197.71 20 -1.2 -35 -21.2 -55.0

CBI-26-V-006 2340425.79 121974.56 20 -5.2 -20 -25.2 -40.0

CBI-26-V-007 2340669.90 121800.00 20 -1.7 -10 -21.7 -30.0

CBI-26-V-008 2340638.40 121973.29 20 -3.3 -10 -23.3 -30.0

CBI-26-V-009 2340600.98 122132.80 20 -3.7 -10 -23.7 -30.0

CBI-26-V-010 2339701.75 122263.84 20 -8.0 -12 -28.0 -32.0

CBI-26-V-011 2339951.80 122455.90 20 -1.4 -12 -21.4 -32.0

CBI-26-V-012 2340219.56 122405.84 20 -0.2 Not Dredged -20.2 -20.2 CBI-26-V-013 2340490.28 122343.32 20 -0.9 Not Dredged -20.9 -20.9 CBI-26-V-014 2340443.27 122524.01 20 -1.6 Not Dredged -21.6 -21.6

CBI-26-V-015 2340401.61 122175.06 20 -3.0 -20 -23.0 -40.0

Carolina Beach Inlet Tidal Delta CBI-26-V-016 2341015.87 121702.65 20 -2.3 Not Dredged -22.3 -22.3 CBI-26-V-017 2340908.66 122068.97 20 -3.6 Not Dredged -23.6 -23.6 CBI-26-V-018 2340974.83 122287.19 20 -3.7 Not Dredged -23.7 -23.7 CBI-26-V-019 2340769.77 122466.10 20 -2.1 Not Dredged -22.1 -22.1 CBI-26-V-020 2340640.60 122712.86 20 -2.3 Not Dredged -22.3 -22.3 CBI-26-V-021 2340723.70 122954.59 20 -3.3 Not Dredged -23.3 -23.3 CBI-26-V-022 2341154.28 123022.57 20 -3.5 Not Dredged -23.5 -23.5 CBI-26-V-023 2341681.23 122867.58 20 -2.4 Not Dredged -22.4 -22.4 CBI-26-V-024 2341862.22 122663.58 20 -3.0 Not Dredged -23.0 -23.0 CBI-26-V-025 2342002.06 122457.25 20 -3.5 Not Dredged -23.5 -23.5 CBI-26-V-026 2342187.41 122241.62 20 -3.4 Not Dredged -23.5 -23.5 CBI-26-V-027 2342406.59 122071.02 20 -4.2 Not Dredged -24.2 -24.2

* Assumes 100% Recovery of 20-Ft Core, while varying TOH EL based on dredging activity.

“Not Dredged” indicates areas that were outside the borrow area boundary or excluded from use.

Table 2. Activity Description and Timeline.

Activity Duration (calendar days)

USACE

Responsibility

Contractor Responsibility

Contract Award 180 X Accident Prevention Plan (Total Days) 22 APP – Draft and Submit 7 X USACE Review of Draft APP 7 X APP Revisions and Resubmittal 7 X USACE Review of Revised APP and Acceptance 1 X Field Work and Geotech Analysis (Total Days) 128 Mobilization 5 Core Collection 70 X Logging and Photographs – Generate and Submit 13 X Lab Sample Picks 7 X Laboratory Analysis 33 X Report of Investigation (Total Days) 30 Draft Report - Generate and Submit 10 X SAW Review of Draft Report 5 X Report Revisions and Resubmit 5 X SAW Review of Final Report and Acceptance 5 X

Final Submittal (Final Report Hard Copy and Electronic Files and Archive Vibracores)

5 X

Total Calendar Days 180 Calendar Days

If the Contractor encounters unforeseen delays in meeting an event on the timeline, the Contractor’s project manager shall notify the KO and COR in writing no earlier than 5-business days prior to the due date. The Contractor shall describe the circumstances that led to the delay, his or her immediate actions to mitigate impacts to schedule, and event/timeline updates.

Table 3. Bidding/Cost Proposal

Item No.

Description Quantity Unit Unit Cost

Subtotal Cost

0001 Mobilization and Demobilization 1 Job 0002 Boring Collection 27 Each 0003 Boring Logs and Photographic Logs 27 Each 0004 Lab Tests 207 Each 0005 Report of Investigation 1 Job 0006 5-Foot Vibracore Archive 1 Job

Figure 1. USACE hydrographic survey, Carolina Beach Inlet, January 2026. Depth units are in feet.

See Figure 2 for Detail

See Figure 3 for Detail

Figure 2. Carolina Beach Inlet Borrow Area, January 2026 condition survey, dredge cuts and proposed boring locations.

Figure 3. Carolina Beach Inlet tidal shoal, October 2025 and January 2026 condition surveys and proposed boring locations.