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Solid Waste Management Unit (SWMU) 16 Old Southside Landfill Joint Base Charleston WeaponsCorrective Measures Implementation

Michael P. Healy, PG

Cape Environmental Management Inc

Program Manager

December 4, 2013

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What is the Site?

Landfill was used for waste disposal between 1941 to 1978

Wastes included household waste, construction and demolition materials, empty containers, metal waste, mercury batteries, oily wastes, and solvents.

Wastes also included munitions and explosives of concern (MEC) crates containing 90-millimeter rounds.

SWMU 16 is approximately 13 acres and is partially within the tidal marsh zone north of Goose Creek.

SWMU 16 was closed in 1980 and a portion of the site was covered with 2 feet of local soil fill.

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Site LocationJB CHS

Weapons

SWMU 16

Cooper River

Goose Creek

SWMU 16

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Where is the Site? Located in the southern part of JB CHS Weapons. Bordered by:

• An unnamed gravel road to the north

• Torpedo Road and Wilkinson Way to the east

• Tidal marsh of zone north of Goose Creek to the south and west

Unnamed gravel road

Torp

edo R

oad

Wilk

inso

n W

ay

Tidal marsh

Tidal marsh

SWMU 16

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RCRA Process

RCRA Facility Assessment

(RFA)1998

RCRA Facility Investigation

(RFI)2008

Corrective Measures

Study (CMS)2012

Remedy Selection

2012

Corrective Measures

Implementation (CMI)2014

Operations and Maintenance2014 – 2015

Permit Modification

Permit Modification

2014

We Are Here

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CMS and CMI Design A CMS was conducted in 2012 and recommended

Alternative S16-03 as the remedy, which includes: Removal of contaminated soil in the known hot spot Removal of surface debris throughout the site Installation of a vegetated soil cover system Land Use Controls (LUCs), monitoring, and inspections The LUCs must be notated into the JB CHS Weapons

Master Development Plans The 100% CMI Design was completed by Tetra Tech and

approved in 2012. The design document includes: 100% Final Design drawings Specifications

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Corrective Measures ImplementationMajor elements of the Corrective Measures Implementation (CMI) include: Surface debris removal Polychlorinated biphenyl (PCB) hot spot removal (25 X 25

SF, 1 foot depth) Diversion swale construction Landfill cover installation (3.7 acres) Permanent fence and sign installation Wetlands compensatory mitigation master plan and site-

specific plan 0.64 acres of tidal wetlands will be lost due to CMI construction These plans will identify wetlands at JB CHS Weapons to restore

for this project and for future projects

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Major Deliverables

• CMI Work Plan• Uniform Federal Policy for Quality Assurance Project

Plans (UFP-QAPP)• CMI Operations and Maintenance (O&M) Plan• Explosive Safety Submittal (ESS)• Site Safety and Health Plan (SSHP)• Stormwater Pollution Prevention Plan (SWPPP)• Wetlands Compensatory Mitigation Master Plan • Site Specific Wetlands Compensatory Mitigation Plan• CMI Construction Completion Report• CMI O&M Quarterly Inspection Reports

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Permits and Regulatory Compliance• Notice of Intent (NOI) to request coverage under the

National Pollutant Discharge Elimination System (NPDES) General Permit for Construction

• US Army Corps of Engineers (USACE) Nationwide Permit Number 38

• Clean Water Act (CWA) 401 Water Quality Certification

• Coastal Zone Management Act• Construction in Navigable Waters• Endangered Species Act Compliance• PCB Remediation Waste US EPA Notification

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Proposed Wetlands Mitigation Area for SWMU 16

The proposed mitigation is to restore 0.84 acres of tidal marsh at the proposed mitigation area and to reestablish normal tidal flow

Proposed Mitigation Area

Goose Creek

SWMU 16

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Proposed wetlands mitigation area for SWMU 16 – Present site conditions

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Potential Wetland Mitigation Areas for the Master Plan

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Site Layout

Stabilized Construction Entrance

Decontamination Pad

Access to Site

Storage/Staging Area

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Landfill Cover

PCB Hot Spot

Surface Debris Removal Limit

Construction - Overview

• Surface Debris Removal

• PCB Hot Spot Removal

• Diversion Swale Installation

• Permanent Fence Installation

• Interim Landfill Cover, with Geotextile

• Final Landfill Cover

• Restoration

Diversion Swale

Diversion Swale

Fence

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CMI Construction Activities

Installing temporary soil and erosion controls for construction activities

Clearing and grubbing vegetation UXO construction support Construct Staging/Storage Area Construct diversion swales Miscellaneous Site Work Activities:

Install temporary fence and signs Install decontamination pad Abandon 2 monitoring wells Install permanent fence/signs/delineation posts

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CMI Construction Activities (continued)

Surface Debris Removal Hot Spot Removal and Verification Sampling Interim grading of the landfill surface Placing geosynthetic marker Final grading of the landfill surface, 18 inches of fill

and 6 inches of top soil Hydro seeding and establishing grass Restore Staging/Storage Area Restore wetlands identified in the Site Specific

Wetlands Mitigation Compensatory Plan

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Construction Schedule Mobilization – Apr 2014 Erosion & Sediment Controls – May to Oct 2014 Swale Construction – Apr to Jul 2014 Clearing & Grubbing – Apr to May 2014 Staging/Storage Area Construction - Apr to May 2014 Miscellaneous Site Work Activities – May 2014 Surface Debris Removal – Apr to May 2014 Hot Spot Removal – Jun to Jul 2014 Landfill Soil Cover – Jun to Sep 2014 Site Restoration – Sep 2014 Demobilization – Sep 2014 Wetlands Mitigation – Aug 2014

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Equipment Planned

Job site trailer Dozer Excavators Loader Compactor Drill Rig Roll-off Dumpsters

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Haul Route

Wilkinson Way Perimeter Road Avenue B Perimeter Road Remount Road

SWMU 16

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Post Construction

Conduct O&M activities Perform quarterly inspections for 1 year Maintenance items include:

Removal and disposal of surface debris Reseeding soil cover and drainage swale Repair of eroded areas, settled areas, or areas damaged Maintenance of access road, access gate, security fence,

signage, and delineation posts

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Questions?