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Repair 3rd Battalion Pond Causeway eProjects WON 1669917 MCRD Parris Island, SC

Final Design Submittal July 2024

CONSTRUCTION WORK PLAN

Repair 3rd Battalion Pond Causeway eProjects WON 1669917 MCRD Parris Island, SC

Final Design Submittal July 2024

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Construction Work Plan

3rd Battalion Pond Causeway Repairs

Marine Corps Recruit Depot

Parris Island, South Carolina

June 10, 2024

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NAVFAC | 3rd Battalion Pond Causeway Repairs Construction Work Plan Contents i

1.0 Introduction

1.1 Relevant Documents

2.0 Causeway Landfill (Site 3) Overview

2.1 Background

2.2 Remedial Action

2.2.1 Remedial Action Objectives

2.2.2 Land Use Control Objectives

2.2.3 Remedy Components

2.2.4 Contaminants of Concern

2.3 Remedy Implementation and Review

3.0 Project Management and Planning

3.1 Key Personnel

3.1.1 Project Manager

3.1.2 Contract Managers

3.1.3 Field Manager

3.1.4 Site Safety and Health Officer

3.1.5 Quality Assurance Officer

3.1.6 Subcontractors

3.2 Meetings, Plans, and Reports

3.2.1 Pre-Construction and Mutual Understanding Meeting

3.2.2 Quality Control Progress Meetings

3.2.3 Pre-Construction Plans

3.2.4 Daily Reports

3.2.5 Remedial Action Completion Report Addendum

3.3 Permitting

4.0 Geotechnical Investigation Summary

5.0 Proposed Design

5.1 Relevant Specifications and Applicable Regulations

5.1.1 Specifications

5.1.2 Regulations

5.2 Site Preparation

5.2.1 Relocation of Existing Utilities

5.2.2 Erosion and Sediment Control Measures

5.3 Culvert Replacement

5.3.1 Existing Culvert Removal

5.3.2 New Culvert Construction

5.3.3 Landfill Cap Modification

5.3.4 Waste Management

5.4 Asphalt Roadway

5.4.1 Waste Management

ii

5.5 Engineered Control Repair

6.0 References

Figures

Figure 2-1 – Site Location

Figure 2-2 – Land Use Control Areas - Site 3

Figure 3-1 – Site Plan

Figure 3-2 – Traffic Plan

Figure 5-1 – Soil and Slope Requirements

Figure 5-2 – Typical Cross Section

Figure 5-3 – Temporary Utility Plan - North Bridge

Figure 5-4 – Temporary Utility Plan - South Bridge

Figure 5-5 – Final Utility Plan - North Bridge

Figure 5-6 – Final Utility Plan - South Bridge

Figure 5-7 – North Culvert Existing Condition

Figure 5-8 – North Culvert Excavation Plan

Figure 5-9 – North Culvert Surface Repair

Figure 5-10 – North Culvert Plan and Profile

Figure 5-11 – South Culvert Existing Condition

Figure 5-12 – South Culvert Excavation Plan

Figure 5-13 – South Culvert Surface Repair

Figure 5-14 – South Culvert Plan and Profile

Figure 5-15 – North & South Culvert Sheet Pile Details

Figure 5-16 – North & South Culvert Channel Slab Details

Appendices

Appendix A – Waste Management Plan

Appendix B – Soil Management Plan

Appendix C – Utility Relocation and Restoration Plan

Appendix D – Anticipated Comprehensive Project Schedule

Appendix E – RAWP Closure Report As-Built Drawings

Introduction

1.0 Introduction

HDR, Engineering, Inc. (HDR) has been contracted by the United States Department of the

Navy (Navy), under Naval Facilities Engineering Systems Command (NAVFAC) Contract

N4008518D0601, Contract Task Order N4008520F5958, to design culvert and causeway repairs at Marine Corps Recruit Depot Parris Island (MCRD PI) located on Parris Island, South

Carolina.

As part of the culvert and causeway design, NAVFAC and MCRD PI must consider the presence of solid waste and fill dirt used to construct the Causeway Landfill (Site 3; Superfund

Site ID SC6170022767) from 1960 to 1972. Note that this work is not being conducted under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), although it is a CERCLA site. However, the construction activities must plan for and implement work practices that are designed to be protective of human health and the environment to prevent release of landfill waste materials or contaminated soils from the landfill. Release of landfill waste reporting will be in accordance with Construction Permits to the Construction Work

Plan (CWP). Any release of waste will be reported in accordance with Construction Permits to the Tier 1 Restoration Team to the CWP.

This Construction Work Plan was developed to outline design/ construction efforts.

The LUC Remedial Design requires the following: “The Navy will submit a construction plan, conveying the scope of work and anticipated schedule, to USEPA and SCDHEC prior to any excavation, construction, or other intrusive activities that could compromise the integrity of the

Causeway Landfill cover system. Such intrusive activities will not be initiated until approval is provided by USEPA and SCDHEC.” This CWP presents the scope of work and schedule

(Appendix D) for the proposed construction and approval of this plan by USEPA and SCDHEC and is intended to meet the requirements of the LUC Remedial Design for Site 3.

The Final ROD identifies the following description of the remedy:

• Installation of slope stabilization and erosion controls along the sides of the full length of the causeway

• A soil cover over the sides and top of portions of the causeway

• Sediment Covers

• Roadway construction

• Land use controls (LUCs) and periodic inspections

• Long Term Monitoring

• Maintenance of Soil Cover/Cap

To maintain these bulleted components, the ROD goes on to state "LUCs will be implemented to ensure integrity of the landfill cover system, including soil, geotextile, rip-rap, culverts, and other remedy components such as monitoring wells, etc.; prevent unacceptable uses ... and unauthorized intrusive activities." Thus, this project must have approval for any intrusive activities which impact any of the landfill cover system remedial components including but not

Introduction limited to soil, geotextile, rip-rap, culverts, and monitoring wells, etc. This CWP was prepared to obtain regulatory approval to negatively impact remedial system components and convey a construction plan that returns the impacted remedial system components to a condition that meets or exceeds the ROD and RAWP requirements, as well as the RACR documented standards achieved.

Thus, the CWP will:

• Identify key construction contractor personnel including responsibilities, duties, and lines of authority and communication.

• Present the conceptual design, including a summary of geotechnical activities, depth of disturbance, means/methods of construction, and materials to be used in construction.

• Identify how construction activities will meet the ROD/LUC requirements for Site 3

• Define the quality assurance and quality control (QA/QC) procedures to monitor compliance with regulatory requirements.

• Identify documentation and reporting requirements for the administrative record. A

Construction Completion Report (CCR) will be required to be submitted for review and approval by the Regulators (See Section 3.2.5) to document completion of work plan components in a manner which is protective and meets established requirements. This

CWP and the CCR will be submitted under Navy Cover Letter to the Administrative

Record to document the current status and condition of the remedy at Site 3.

Note that the proposed construction activities will not impact the existing sediment covers;

therefore, these components of the remedy will not be discussed further in this document.

However, the sediment cover areas shall be marked on all figures containing the area to document they are not in the area impacted.

1.1 Relevant Documents

To support the culvert and Causeway repair construction design and the development of this

CWP, the following reports were reviewed:

• RCRA Facility Investigation for Site/SWMU3 Causeway Landfill, Marine Corps Recruit

Depot - Parris Island, Parris Island South Carolina, Vol 1 and Vol 2 (Tetra Tech, November 1999).

• Feasibility Study/Corrective Measures Study for Site/SWMU3 Causeway Landfill, Marine

Corps Recruit Depot - Parris Island, Parris Island South Carolina (Tetra Tech, June

2000).

• Installation Restoration Program Public Comment Mailing - Proposed Plan for Soil

Interim Remedial Action at Site/SWMU 3, Marine Corps Recruit Depot - Parris Island, Parris Island South Carolina (MCRD Commanding General, June 2000).

• Interim Remedial Action Work Plan – Site/SWMU 3 Causeway Landfill, Marine Corps

Recruit Depot - Parris Island, Parris Island South Carolina (CH2M Hill, August 2000).

• Interim Soil Record of Decision for Site 3 Causeway Landfill, Marine Corps Recruit Depot, Parris Island, South Carolina (Department of the Navy, September 2000).

• Interim Remedial Action/Corrective Action Report Site/SWMU 3 (CH2M Hill, June 2002).

Causeway Landfill (Site 3) Overview

• Final Record of Decision, Site 3, Marine Corps Recruit Depot, Parris Island, South Carolina (Department of the Navy, August 2011).

• Remedial Action Completion Letter Report, Marine Corps Recruit Depot Parris Island

(MCRD Parris Island, June 2012).

• Final Land Use Control Remedial Design Site 3 Solid Waste Management Unit (SWMU

3) Causeway Landfill Revision 4 MCRD Parris Island, SC (Resolution Consultants, January 2020).

Note that and Explanation of Significant Differences (ESD), which will modify the current limitations on fishing and associated signage requirements on the Causeway, and an Updated

LUC Remedial Design (RD) document, will need to be considered relevant documents upon completion and requirements met. The pending ESD and LUC RD will be relevant documents when complete and requirements therein are the responsibility of the Navy/Marine Corps and may be incorporated into this or another contract.

2.0 Causeway Landfill (Site 3) Overview

2.1 Background

The 3rd Battalion Causeway (the Causeway), located at MCRD PI, is an integral part of the

MCRD facility. The Causeway connects Horse Island to Parris Island (Figure 2-1) and is one of two traffic routes to and from the main gate. The approximately 4,500 foot long, earthen embankment Causeway is traversed by the two-lane 3rd Battalion Pond Road, primarily used for passenger and construction vehicle traffic, both civilian and military. Integral to the construction of the Causeway are two concrete pipe culvert systems, one near the northern terminus of the

Causeway (the North Culvert) and one closer to the southern terminus (the South Culvert).

Impounded by the Causeway to the northeast is the 3rd Battalion Pond. A tidal estuary fed by

Ribbon Creek is located on the southwest side of the Causeway.

The Causeway was constructed over an unregulated landfill (Site 3) that operated from 1960 to

1972, which was covered with soil, geotextile, and rip rap as part of a previous remedial action completed under the Department of the Navy’s Environmental Restoration Program and as approved by the United States Environmental Protection Agency (USEPA) and the South

Carolina Department of Health and Environmental Control (SCDHEC). The Navy’s

Environmental Restoration Program is responsible for ensuring that appropriate response alternatives are developed and implemented as necessary to protect public health, welfare, and the environment. In accordance with a Federal Facility Agreement, executed on 31 March

2006, response alternatives and associated documents must be accomplished and prepared under both Comprehensive Environmental Response, Compensation, and Liability Act

(CERCLA) and Resource Conservation and Recovery Act (RCRA) components.

2.2 Remedial Action

As documented in the ROD, the response action was selected to protect the public health and welfare and the environment from actual or threatened releases of hazardous substances into the environment from Site 3. Prior studies identified concentrations of benzo(a)anthracene, benzo(a)pyrene, benzo(b)fluoranthene, benzo(g,h,i)perylene, benzo(k)fluoranthene, chrysene, arsenic, lead, mercury, and zinc in soil that posed unacceptable risks to ecological receptors.

Concentrations of polychlorinated biphenyls (PCBs), 4,4’-DDE, and mercury were deemed to pose unacceptable risks to fishermen from fish consumption. A CERCLA response action was required because of unacceptable risks to ecological receptors exposed to soil and to adult subsistence fishermen, child subsistence fishermen, child recreational fisherman, and USEPA

Region 4 default adult recreational fishermen. The Causeway landfill remedy was selected in the Interim Soil Record of Decision (Department of the Navy, Sept 2000) and the Final Record of Decision (Department of the Navy, August 2011).

Specific to the culvert and roadway design project, the planned construction activities must be implemented in a manner designed to control unacceptable human health and ecological exposure to contaminants of concern (COCs) with a goal to ensure the same level of effectiveness as the selected remedy in the ROD and consistent with the LUCs for Site 3.

2.2.1 Remedial Action Objectives

The Remedial Action Objectives (RAOs) are medium-specific goals that define the objective of conducting remedial actions to protect human health and the environment. The ROD specified the following RAOs:

• Control exposure of human receptors to COCs in surface soils at Site/SWMU that are at concentrations in excess of the remedial goal options (RGOs)

• Control exposure of ecological receptors to COCs in surface soils that are at concentrations in excess of the RGOs

• Eliminate the migration of COCs from the fill material to sediment, surface water, and groundwater

• Comply with chemical-specific, location-specific, and action-specific federal and state

Applicable or Relevant and Appropriate Requirements (ARARs)

• Control human exposure to COCs via fish consumption

2.2.2 Land Use Control Objectives

Consistent with the above RAOs, the ROD identified specific performance objectives for the project’s LUCs:

• To prohibit residential, commercial, agricultural, and recreational use (including wading, swimming, and fishing) of the site. Prohibited residential uses shall include, but are not limited to, any form of housing, child-care facilities, schools, and playgrounds.

• To prevent unauthorized excavation, construction, or intrusive activities that would compromise the integrity of the Causeway Landfill cover system unless a construction plan is submitted and approved by the Navy, USEPA, and SCDHEC prior to initiating the work.

• To prohibit disturbance of the covered sediment areas in the 3rd Battalion Pond.

• To prohibit the extraction or any use of groundwater beneath the site.

• To prevent ingestion of contaminants in fish tissue.

• To maintain the integrity of the landfill cover system, as well as any existing or future monitoring system such as the groundwater monitoring wells.

Note that while the ESD is not expected to change LUC Objectives specifically, the updated

LUC RD will change, and associated requirements will need to be met based on the timing of the completion of the ESD/LUC RD relative to the completion of the Causeway repair (assuming

ESD/LUC RD will be completed first). The project LUC areas are shown on Figure 2-2.

2.2.3 Remedy Components

The 2000 Interim ROD, later incorporated into the ROD, identified the following selected remedy components:

• Installation of slope stabilization and erosion controls along the sides of the full length of the Causeway.

• A soil cover over the sides and top of portions of the Causeway.

• A soil cover over the top of the four areas of sediment in the 3rd Battalion Pond.

• Roadway construction.

• LUCs and periodic inspections.

o Erection of Signs (providing notice of the use restrictions).

• No unauthorized intrusive activities (e.g., drinking water well installation;

unauthorized groundwater extraction; soil cover penetration, etc.)

• No swimming or wading in 3rd Battalion Pond.

• Fishing restrictions.

o Update Base Master Plan, GIS and EMS on LUC boundaries and land use restrictions (i.e., no residential use, etc.).

o Deed/lease restriction in the event of property transfer.

o Visual inspections to verify LUCs are effectively implemented.

• Long-Term Monitoring.

o Inspect Cover Integrity.

o Monitor leachate from landfill with groundwater wells inside the unit boundary.

• Maintenance of Soil Cover/Cap.

• No Action for Sediments.

• No Action for Surface Water.

2.2.4 Contaminants of Concern

The Interim ROD identified the following COCs and remediation levels.

Interim Record of Decision Contaminants of Concern and Remediation Levels for Soil Operable Unit 3 (Site 3/SWMU 3)

COCs Range of Detections

Site 3 Soil Cleanup Levels

Basis

Semivolatile Organic Compounds (units in micrograms per kilogram)

Benzo(a)Anthracene 3-3000 1000 Ecological (Dutch Soil Cleanup Act “b” Values (Beyer, 1990)

Benzo(a)pyrene 4.1-4000 890 Site Specific Human Health Remedial Goal Option ILCR 1E-06 (Tetra Tech 2000a)

1000 Ecological (Dutch Soil Cleanup Act “b” Values (Beyer, 1990)

Benzo(b)Fluoranthene 2.2-3400 1000 Ecological (Dutch Soil Cleanup Act “b” Values (Beyer, 1990)

Benzo(g,h,i)Perylene 9.3-2500 1000 Ecological (Dutch Soil Cleanup Act “b” Values (Beyer, 1990)

Benzo(k)Fluoranthene 1.7-1300 1000 Ecological (Dutch Soil Cleanup Act “b” Values (Beyer, 1990)

Chrysene 3.6-2900 1000 Ecological (Dutch Soil Cleanup Act “b” Values (Beyer, 1990)

Indeno (1,2,3-cd)pyrene 2.6-2600 1000 Ecological (Dutch Soil Cleanup Act “b” Values (Beyer, 1990)

Metals (units in milligrams per kilogram)

Arsenic 0.44-11.8 7.79 Ecological lowest-observable effects threshold, HQ=1 (Tetra Tech 2000a)

Lead 5.5-264 61.9 Ecological lowest-observable effects threshold, HQ=1 (Tetra Tech 2000a)

Mercury 0.00375-0.43 0.11 MCRD Background value (Tetra Tech 1999)

Zinc 5.7-205 95.5 Ecological lowest-observable effects threshold, HQ=1 (Tetra Tech 2000a)

Notes:

HQ = Hazard Quotient ILCR = Increment lifetime cancer risk MCRD = Marine Corps Recruit Depot SWMU = solid waste management unit Source: Interim Soil ROD (Tetra Tech, September 2000a), page 2-15

2.3 Remedy Implementation and Review

The landfill remediation and sediment capping activities were completed in 2000 and documented in the Interim Remedial Action Corrective Action Report (CH2M Hill, June 2002).

The 2002 report included specifications for maintaining the integrity and effectiveness of the landfill cover, including making repairs to the cover as necessary to correct the effects of settling, subsidence, erosion, or other events. Following completion of the interim remedial action, routine visual inspections of soil cover, slope stabilization, and roadway components were performed quarterly (for the first year) and semi-annually or following major storm events thereafter. After the ROD was finalized in 2011, inspection of the landfill was conducted in accordance with the Remedial Action Completion Letter Report (MCRD, June 2012) and the

LUC Remedial Design (Resolution Consultants, January 2020). The 2015 Five-Year Review

(Resolution Consultants, August 2016) and routine LUC inspections identified the presence of sinkholes along the surface of the Causeway, above both sets of culverts. Immediate repairs addressed open sinkholes and allowed for continued use of the Causeway; however, subsequent assessments indicated that further repairs are necessary to prevent future sinkholes and ensure continued long-term effectiveness of the RA.

The proposed repairs, as summarized herein and detailed in the 3rd Battalion Causeway Basis of Design 100% submittal, would replace the two three-pipe culvert systems connecting the tidal marsh with the 3rd Battalion Pond with two open channel culvert and bridge systems for vehicles and pedestrians.

Project Management and Planning

3.0 Project Management and Planning

The Navy will engage a construction contractor to complete the culvert and Causeway repair.

The construction contractor will be required to meet the requirements of this CWP. Construction oversight, quality assurance, and government acceptance will be the responsibility of the Navy.

Regulatory approval will be provided by USEPA and SCDHEC; relevant documents requiring approval are discussed in Section 3.2.

3.1 Key Personnel

Personnel that will implement the CWP for the project include the Project Manager (PM), Contract Managers, Field Manager, Site Safety and Health Officer (SSHO) and Quality

Assurance Officer.

3.1.1 Project Manager

The PM will ensure compliance with the CWP and is the point of contact (POC) with the Navy.

The PM is responsible for managing the day-to-day project activities, ensuring documentation and deliverables meet contract requirements, monitoring costs and accounting, and controlling the overall schedule.

3.1.2 Contract Managers

The Contract Administration Manager and Project Controls Manager will support the PM with contractual and budget issues. The Contract Administration Manager is the POC with the Navy

Contracting Officer and ensures compliance with prime contract requirements. The Project

Controls Manager is responsible for accumulating project costs expended to date, forecasting costs to completion, preparing monthly invoices, and maintaining and updating the project schedule.

3.1.3 Field Manager

The Field Manager will report directly to the PM and is responsible for daily oversight of field activities, interfacing with facility personnel, and obtaining necessary permits. The Field

Manager is responsible for ensuring all site work conforms to requirements and procedures identified in this CWP. In addition, the Field Manager will complete a daily field activity report.

3.1.4 Site Safety and Health Officer

The SSHO is responsible for ensuring compliance with the site Safety and Health Plan to satisfy that federal, state, and local regulations are followed during construction activities.

3.1.5 Quality Assurance Officer

The Quality Assurance Officer (QAO), is responsible for implementation of uniform quality management procedures, assessing overall quality performance, conducting quality audits, and assuring that planned quality control activities are accomplished, comments resolved, and resolution of comments and issues are properly documented. The QAO will advise and assist the Project Manager on all aspects of the Quality Program.

3.1.6 Subcontractors

As part of the implementation of field activities, various subcontractors will be utilized throughout the project. Subcontractor services may include site setup, demolition, culvert inspection and repairs, excavation and backfilling, transportation and disposal of waste, asphalt paving, site restoration and many other services. The construction contract will require that all subcontractors meet the requirements of this CWP.

3.2 Meetings, Plans, and Reports

This section describes meetings that will be conducted, plans that have been prepared, and reports that will be submitted during construction of the culvert and Causeway repairs at Site 3.

3.2.1 Pre-Construction and Mutual Understanding Meeting

Prior to the start of construction activities, a pre-construction and mutual understanding meeting will be held to discuss the planned work activities and schedule, establish lines of communication, address facility and site access requirements, address site logistics, confirm work hours, review reporting requirements, and discuss other pertinent site information. Meeting minutes will be prepared and submitted to the Navy for approval.

3.2.2 Quality Control Progress Meetings

Quality Control Progress meetings will be held on a regular basis during field activities to discuss work progress, submittal status, and quality performance. A meeting agenda will be prepared, and meeting minutes will be provided to stakeholders following the meetings. The

Navy, MCRD PI, and other stakeholders will facilitate quarterly meetings (or more often as warranted) with the USEPA and SCDHEC to discuss project process at it relates to compliance with this CWP.

3.2.3 Pre-Construction Plans

Plans prepared as part of the pre-construction effort include this CWP, Waste Management

Plan (WMP), and Soil Management Plan (SMP). The WMP is included as Appendix A. The SMP is included as Appendix B. The construction contractor will be required to prepare an

Environmental Protection Plan (EPP), Health and Safety Plan (HASP), Quality Assurance

Project Plan (QAPP), Site Plan, and Traffic Plan. These plans will be subject to review and approval by the USEPA and SCDHEC prior to commencement of fieldwork.

The EPP, QAPP, Site Plan and Traffic Plan requirements for construction contractors are included below. In addition, a Ground Penetrating Activity Permit will be required prior to commencement of construction activities.

3.2.3.1 ENVIRONMENTAL PROTECTION PLAN REQUIREMENTS

An Environmental Protection Plan (EPP) plan is to be completed by the contractor prior to the start of the construction activities. The plan will be approved by MCRD PI.

The EPP will include the following elements:

1. General Overview and Purpose

2. General Site Information

3. Management of Natural Resources

4. Protection of Historical and Archaeological Resources

5. Stormwater Management and Control

6. Protection of the Environment from Waste Derived from Contractor Operations

7. Prevention of Releases to the Environment

8. Regulatory Notification and Permits

9. Clean Air Act Compliance

Elements that will require project specific requirements based on the presence of waste materials include:

• Applicable Federal, State, and Local Laws, Regulations, and Permit Requirements

• Protection of Features Plan & Historical, Archaeological, Cultural/Biological Resources &

Wetlands Plan

• Planned Environmental Controls

• Sediment and Erosion Control Measures

• Stormwater Pollution Prevention Plan

• National Pollutant Discharge Elimination System (NPDES) permitting

• Environmental Monitoring

• Containment Plan

• Maintenance of Hazardous Material Safety Data Sheets

• Environmental Protection Point of Contact Name (Adherence to the Environmental

Protection Plan)

• Manifesting Hazardous Waste

• Description of Contractor’s Environmental Training Program

• Non-Hazardous Solid Waste Disposal Plan

• Hazardous Solid Waste Disposal Plan

Additionally, the following will be provided to USEPA and SCDHEC for review prior to implementation:

• EPP for Protection of the Environment from Waste Derived from Contractor Operations as it applies to protecting the landfill areas

• Prevention of releases to the Environment as it applies to any potential for releases onto/into the landfill areas

• Regulatory Notification as it applies to USEPA

• Containment Plan

3.2.3.2 HEALTH AND SAFETY PLAN

A HASP will be developed to outline the requirements to be met by employees, subcontractors, and visitors while performing culvert replacement activities and roadway repairs. The HASP will describe the responsibilities, training requirements, personal protective equipment, and safety procedures necessary to reduce the risk of injury, fires, explosion, chemical spills, and material damage incidents related to construction activities. It will incorporate by reference the

Occupational Safety and Health Administration (OSHA) regulations contained in 29CFR1910 and 29CFR1926. The plan will be approved by MCRD PI.

3.2.3.3 QAPP REQUIREMENTS

A QAPP will be prepared describing, in comprehensive detail, the necessary quality assurance

(QA), quality control (QC), and other technical activities that must be implemented to ensure that the results of the work performed will satisfy requirements of ROD performance criteria. The

QAPP integrates technical and quality control aspects of a project throughout its life cycle, including planning, implementation, assessment, and corrective actions. The QAPP will include:

• Data quality objectives (DQO) that specify the data needed to support decisions regarding remedial response activities; and

• A field sampling plan (FSP) that describes the number, type, and locations of samples and types of analyses.

The plan will be approved by MCRD PI.

Additionally, the following will be provided to USEPA and SCDHEC for review prior to implementation:

• QAPP as it applies to sampling soils deposited back into/onto the landfill (FSP) and

QA/QC assessments to ensure the work performed will meet the requirements and specifications.

3.2.3.4 SITE PLAN REQUIREMENTS

The site plan (Figure 3-1) preliminarily identifies the work areas and support areas that are anticipated to be used during the field activities. Proposed locations for the support areas will be subject to approval by the Navy and MCRD PI and will be determined at the pre-construction meeting. It is currently anticipated that a support area for temporary facilities (e.g., trailer, generator, toilets, dumpster, stockpiles) will be available for use at one end of the Causeway.

Equipment and materials are proposed to be stored on the paved parking spaces located adjacent to each work area in addition to a larger designated equipment and material staging area located in the vicinity of the Causeway. High-visibility barriers and signage will be used to restrict access to the work site and support areas as necessary.

The site plan, as it applies to staging of materials/equipment on the landfill and weight limitations, will also be provided to USEPA and SCDHEC for review prior to implementation.

3.2.3.5 TRAFFIC PLAN REQUIREMENTS

Personnel vehicles, vendor delivery trucks, and material haul trucks will gain access to MCRD

PI via the Main Gate located on Malecon Drive and proceed to the site using Malecon Drive, the traffic circle, and 3rd Battalion Pond Road or Malecon Drive, as shown on Figure 3-2. All vendor delivery trucks and material haul trucks will be required to go through the truck inspection area located adjacent to the traffic circle prior to continuing to the site. Traffic controls will be implemented as necessary to provide for the safe passage of vehicles, minimize impact to facility operations, and enable field activities to be completed in a safe manner.

Geotechnical Investigation Summary

Project activities will require full closure of 3rd Battalion Pond Road until construction of both culverts and roadway repair are completed. Closures will be conducted in accordance with the

United States Department of Transportation (DOT) Manual on Uniform Traffic Control Devices, including requirements for warning signs, buffer zones, and barriers. Closures will be coordinated with the MCRD PI Fire Department and Provost Marshall’s Office. The plan will be approved by MCRD PI.

3.2.4 Daily Reports

A daily report will be completed whenever on-site activities occur and will be submitted to pertinent personnel as determined at the pre-construction meeting. Copies of the daily reports will be retained in the Navy project files.

3.2.5 Remedial Action Completion Report Addendum

The Site 3 Causeway is a Facilities Sustainment, Restoration, and Modernization (FSRM) construction project to repair the Causeway road and culverts. A Construction Completion

Report shall be required for this project. The Construction Completion Report shall be required to contain sufficient details and information to show that the project activities have reinstituted the CERCLA site remedy to a condition as good as or better than prior to breaching the LUC.

The report shall document the return of all impacted landfill cover system remedial components to a condition which meets or exceeds the ROD requirements. Community Relations shall be handled in accordance with standard practices employed by MCRD PI to inform the community of construction project activities. A public meeting is not planned for this project. Environmental

Justice is a Government-wide requirement and is considered in Navy and Marine Corps decision making.

3.3 Permitting

Drilling, dewatering, excavation, and construction operations require several permits from various agencies. At minimum, the following permits or equivalent approvals will be obtained prior to commencing work:

• Clean Water Act Section 404 Permit – U.S. Army Corps of Engineers

• Clean Water Act Section 401 Water Quality Certification – U.S. Army Corps of Engineers

• Section 9 of Rivers and Harbors Act Permit – U.S. Coast Guard

• National Pollutant Discharge Elimination System (NPDES) General Construction Storm

Water Permit – SCDHEC

• South Carolina Coastal Zone Consistency Certification – SCDHEC

• Others as referenced in contract documents

• Ground Penetrating Activity Permit – MCRD PI

4.0 Geotechnical Investigation Summary

A multi-phase geotechnical study and engineering analysis (HDR 2020) was completed to investigate multiple concerns regarding the existing condition of the 4,500’ long 3rd Battalion

Pond Road Causeway embankment, roadway surface, and culvert/headwall systems. The

Causeway concerns were evidenced through visible open voids at the pavement edges, Geotechnical Investigation Summary previous sinkholes that had been filled with concrete/flowable fill along the sides of the

Causeway embankment in the vicinity of the culverts, and rough driving conditions due to differential settlement of the roadway surface.

The 2019 geotechnical investigation and findings were divided into two features: the general

Causeway embankment and pavements, and the culverts.

The Causeway findings concluded that the distresses observed along the paved surface resulted from a combination of consolidation settlement of the underlying compressible clay foundation soils due to the weight of the Causeway embankment, and differential settlement of the landfill debris that was included in the original construction.

The Engineering Analysis reviewed the findings of the geotechnical calculations, which demonstrate the majority of the estimated compressible clay layer settlement has already occurred, and future settlements should be tolerable. In addition, since there were no voids or materials that would continue to decompose outside of the culvert area identified during the geotechnical investigation, there is no expectation of significant differential settlement. Note that repairs will not remove or dispose of existing causeway materials in place, and will add a 2-inch asphalt topping at approximately 24 pounds per square foot.

The culvert findings found shallow and deep voids under the road surface and gabion walls, and seepage at the interface of the concrete headwall and the gabions. The water seepage appears to be the primary source for void formation. Since the pond side of the Causeway retains water at a higher elevation than the marsh side a majority of the time, the seepage that occurs during low tide on the marsh side suggests a hydraulic gradient from the pond to the marsh side. Erosion associated with the hydraulic gradient appears to have caused the voids under the road surface through the migration of finer (smaller grain-size sand, silt and clay particles) soils over time (internal erosion). This phenomenon also explains the linear alignment of the voids visually observed through topographic survey and identified in the two focused geophysical survey events (2015 and 2019). Additional seepage has most likely occurred at the lifting holes at the top of each pipe section that were not sealed after installation.

The recommended solution was:

1. Repair the roadway utilizing in place reclamation with cement stabilization, topped with a new hot mix asphalt wearing surface.

2. Replace both existing three-pipe culvert systems with open channels and roadway bridges. The channel walls and weirs will be comprised of deep foundation sheet piles with reinforced concrete fascia. The limits of the channel walls include extending away from the channel a minimum of 25 feet. The depth and limits of channel weirs and walls will regulate the low tide hydraulic gradient between pond and marsh at the culvert locations.

Removal of the three-pipe culvert system eliminates the hydraulic flow around the outside of the pipes. All water will flow in an open channel. For the embankment, the wing wall sheet pile

Proposed Design system will also deflect water pressure away from the bridge area and eliminate the possibility for a gradient flow along the outside of the bridge sheet pile.

5.0 Proposed Design

The proposed Causeway repairs include replacing the two three-pipe culvert systems connecting the tidal marsh with the 3rd Battalion Pond with two open channel culvert and bridge systems for vehicles and pedestrians, and repair of the existing asphalt roadway. The proposed depth of disturbance to support these will vary across the project area. Excavation will range from one to two feet (full depth replacement of the Causeway roadway section) to approximately

15 feet (at the culverts). Each major component of the construction is discussed below. Where applicable, the 100% design drawings and specifications are referenced to demonstrate conformance with the ROD and LUC Remedial design. If desired, a presentation can be provided to USEPA and SCDHEC to review the 100% design before proceeding with construction.

5.1 Relevant Specifications and Applicable Regulations

5.1.1 Specifications

The contractor’s work plan will utilize most recent standards as updated by the governing parties of the technical specifications mentioned (i.e., AASHTO, ACI, ASTM, CRSI, SC State

Highway Department, etc.). Technical specifications for the proposed construction performance standards will meet or exceed the following requirements:

• Minimum two-foot earthen cover over the landfill will be maintained.

• The proposed culvert and Causeway repair construction is not located within the sediment control areas but the sediment control area locations will be shown on the design plans with the requirement that they are not impacted or disturbed. In the event that repairs impact these areas, a minimum two-foot of cover (including geotextile, granular fill and riprap) will be maintained.

• Slope stabilization of the Causeway by regrading/placement of earthen and granular fill, geotextile and rip rap stone will be maintained along the Causeway to form a 3:1 slope up to approximate elevation +8.0. In areas where a 3:1 slope could not be maintained or achieved (culvert areas) a combination of concrete (pond side of the culverts) and gabion baskets (marsh side of the culverts) will be installed.

• Areas above elevation +8.0 to be sodded or seeded with erosion matting to 2-feet beyond the top of the slope.

• Construction of a 24-foot-wide two-lane asphalt roadway.

Technical specifications for the construction design are included in the 100% design submittal for review by USEPA and SCDHEC. Figures 5-1 and 5-2 show the designed conditions for the site as provided from the Installation Restoration Program Public Comment Mailing. These conditions were used as the basis of design for the performance requirements of the proposed culvert replacement construction.

5.1.2 Regulations

The construction activities will be conducted in a manner that complies with, but is not limited to, the following regulations:

• CERCLA exemptions such as certain permit requirements may not apply

• Superfund Amendments and Reauthorization Act (SARA)

• Resource Conservation and Recovery Act (RCRA) Land Disposal Restrictions

• RCRA Subtitle D

• RCRA Subtitle C (as required)

• Federal Standards for Hazardous Waste Transporters

• OSHA federal regulations

• South Carolina Land Disposal Restrictions and

• SCDHEC Solid Waste Management: collection, temporary storage, and transportation

5.2 Site Preparation

5.2.1 Relocation of Existing Utilities

To facilitate the construction of the new culverts both overhead and underground utilities will be temporarily relocated. The following utilities must be relocated to provide clearance and safety during construction of the new culverts and bridges.

• Dominion Energy SC (DESC) - Overhead electrical power transmission line- marsh side

• Parris Island - Overhead electrical power distribution line- pond side

• Brightspeed - Underground communication line- pond side

• Hargray - Underground communication line- marsh side

• Parris Island G6 - Underground communication line- marsh side

All utilities will temporarily be routed to the marsh side of the road in the vicinity of the two culverts. Overhead lines will be transitioned to shallow subsurface lines. The Parris Island and

Brightspeed utilities from the pond side will cross under the road to the marsh side. Two HDPE pipes at each culvert, one for DESC and a second for all other lines, will serve as conduits for temporary utilities and will be placed into the marsh. Upon completion of culvert and bridge construction, power lines will be restored to their aerial location and underground communication lines will be routed through conduits embedded in the bridge safety rails.

Temporary utility line routing is shown on Figures 5-3 and 5-4. Specific procedures necessary to relocate and restore the above-referenced utilities are provided in Appendix C.

Once the new culverts/bridges are constructed, temporarily relocated facilities will be moved to their permanent location as shown on NAVFAC MID ATLANTIC design drawings “REPAIR 3RD

BATTALION CAUSEWAY” dated 1 April 2024, and Figures 5-5 and 5-6. Soils excavated during the utility relocation will be managed and stockpiled in accordance with project WMP

(Appendix A), SMP (Appendix B), and specifications 33 82 00, 31 23 00.00 20, and 02 61 13. If excavated soils are deemed suitable, as defined in the SMP (Appendix B), the material will be reused for replacing the cap in disturbed areas. Excess soils that are generated will be segregated by type (i.e., clean material [top two feet], landfill material, etc.), stockpiled, sampled, and disposed in accordance with the WMP (Appendix A), SMP (Appendix B), QAPP, and the project Specifications. Disturbed areas will be restored with a minimum of two feet of clean cover material and the surface will be finished as denoted on the design drawings.

5.2.2 Erosion and Sediment Control Measures

Before major disturbance of the project site, erosion and sediment control measures will be installed. These control measures will include turbidity curtain, silt fence, stone construction entrance, silt fence rock outlet and concrete washout areas. These control measures will be installed in accordance with the construction specification, design drawings, contractor approved EPP and local and state regulations. Erosion and Sediment control detail can be found on design drawings CE-101 through CE-106 and drawings CE-501 and C-502.

5.3 Culvert Replacement

The exact construction means and methods of the culvert replacement project are not known at this time, as they will be selected by the chosen construction contractor. The following sections describe minimum requirements for major segments of the proposed culvert replacement plan.

Throughout this section, references to “concrete slope protection” indicate the poured/pumped concrete erosion control features present along slopes of the landfill. References to “geotextile” indicate soft fabric material installed to filter, separate, reinforce, drain, or protect soil from overlying material (e.g., clean fill, rip rap).

5.3.1 Existing Culvert Removal

The proposed culvert replacement project starts with the installation of the permanent sheet pile walls as described in the design drawings (S-005 through S-008 and S-011 through S-014) and temporary sheet pile cofferdams to facilitate the demolition of the existing culvert structures.

Where a permanent sheet pile or temporary cofferdam sheet pile meets the existing concrete slope protection, the existing concrete slope protection will be saw cut 4’-6” outside of wall alignment (approximately 18 inches on the outside of the sheet pile coping) to limit the disturbance of the existing cover. Additionally, where the sheet pile will encounter the rip rap slope, the stone will be pulled back and the geotextile liner will be cut to facilitate the installation of the sheet pile wall. Although the location of the cofferdam will be determined by the selected contractor, its location will be marked on contractor submittals and will be installed in accordance with the project Specification. The contractor will then remove the standing surface water from within the temporary sheet pile cofferdam and the existing culvert pipes. This water will be handled and treated, if necessary, in accordance with the construction NPDES permit which will be secured by the selected contractor before the start of construction. Once the standing water is removed, the asphalt roadway and underlying clean material will be excavated to expose the culvert pipes. The exposed culvert pipes, gabion baskets, riprap, concrete slope protection (only within the limits of disturbance), and any landfill material identified within the temporary sheet pile cofferdam will be removed to meet the designed subgrades as prescribed in the design drawings (S-003 through S-014) and the project Specifications. Excavated material generated during this process will be managed in accordance with the WMP

(Appendix A), SMP (Appendix B) and specifications 01 74 19, 33 71 02, 33 82 00, 31 23 00.00

20, and 02 61 13. Additionally, maintenance dewatering within the temporary sheet pile cofferdam will be required to maintain a dry work environment. Pumping will be conducted on an as-needed basis and water will be handled and treated, if necessary, to meet the effluent standards of the construction NPDES permit. If treatment to the effluent standards is not achievable, this water will be collected, characterized for disposal, transported, and disposed in accordance with the specification 01 74 19, WMP (Appendix A), SMP (Appendix B), and local, state, and federal regulations. Sheet pile details are shown on Figure 5-15 North and South

Culvert Sheet Pile Details.

5.3.2 New Culvert Construction

After removal of the existing materials, concrete caps will be installed on the sheet pile wall and the king piles. The concrete caps will be the foundation for the placement of concrete bridge and concrete approach pavements. Concrete coping will be placed atop the steel sheet pile outside of the footprint of the bridge. Concrete caps and coping will be installed in accordance with the design drawings (S-007, S-008, S-013 through S-019, and S-027) and specifications 03 30 00 and 03 31 30.

The existing surface areas adjacent to the new concrete coping will then be final graded, and excess material will be segregated, stockpiled, sampled, and disposed in accordance with the

WMP (Appendix A) and SMP (Appendix B), and project specifications 01 74 19 and 02 61 13.

The bottom of the new open culvert channel will be installed by placing a geotextile/demarcation barrier and clean stone (if needed) to raise the grade to the elevation detailed in the design drawing (thickness will vary). The bottom slab will then be cast in-place with reinforced concrete, as will the concrete covering for the side walls and the weir. Channel slab details for the North and South Culverts are shown on Figure 5-16 North and South Culvert Channel Slab Details.

Note that installation of permanent sheet piles at each culvert offers a significant environmental improvement compared to existing conditions, as the sheet piles could restrict potential leaching from waste material into tidal surface water within the new culvert system or passing through the embankment.

5.3.3 Landfill Cap Modification

King pile walls are fabricated by welding sheet pile elements to W 44x230 steel piles as shown in the design drawings (S-006). For king piles and sheet piles in the walls and weir, a seal is accomplished through a mechanical connection as shown in the design drawings (S-008). Once existing culverts are removed, reinforced concrete fascia will be installed on the sheet pile wall to limit corrosion of the exposed steel sheet pile (S-027). A high-performance joint sealing system will be utilized at the concrete joints between the spill way concrete channel slab and the concrete fascia will be sealed to restrict the potential migration of impacted sediment and contact-water from the landfill to the open culvert/surface water as described in the design drawings (S-028). The joint sealing will be conducted in accordance with project specification 03

31 30 and will be inspected annually as part of the cover inspection.

The existing concrete slope protection that is sawcut to facilitate the installation of the sheet pile wall will be repaired by installing concrete slope protection between the sawcut edge of the existing concrete slope protection and the cast in-place concrete coping cap. This concrete slope protection will be installed on top of the existing 2 feet of clean cover placed during the remedial action. Details for the concrete slope protection tie-in and repair are shown on

Figures 5-7 and 5-9 North Culvert Existing Condition, and North Culvert Surface Repair, and

Figures 5-11 and 5-13 South Culvert Existing Condition and South Culvert Surface Repair.

The surrounding area will then be graded, a geotextile/demarcation barrier and clean material will be placed and compacted in accordance with specification 31 23 00.00 20 and the design drawings. The roadway will then be finished by installing the bridge deck and the approach slabs. Details can be found on the design drawings (Figures 5-7 through 5-10 North Culvert

Existing Condition, Excavation Plan, Surface Repair, and Plan And Profile and Figures 5-11 through 5-14 South Culvert Existing Condition, Excavation Plan, Surface Repair, Plan and

Profile).

5.3.4 Waste Management

During culvert construction activities, excavated materials and water from stockpile or dewatering activities will be segregated by type, stockpiled or containerized, sampled, and disposed in accordance with the WMP (Appendix A) and SMP (Appendix B) and specifications

01 74 19 and 02 61 13.

5.4 Asphalt Roadway

The proposed causeway repair project also includes the full depth replacement of 4,875 feet of roadway, starting approximately 130 feet south of the intersection of 3rd Battalion Pond Road and the traffic circle at the main entrance to approximately 1,050 feet north of the intersection of

3rd Battalion Pond Road and Wake Boulevard. The limits of disturbance for the full depth replacement can be found on design drawings CD-101 to CD-106 and details of the full depth replacement can be found on design drawing CG-201 to CG-211 and CG-301 to CG-325.

Repair of the road pavement section will be accomplished by…