building strong ® 1 solid waste management unit (swmu) 16 old southside landfill joint base...
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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?