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Solid Waste Management Unit (SWMU) 16 Old Southside Landfill Joint Base Charleston Weapons Corrective Measures Impleme

Solid Waste Management Unit (SWMU) 16 Old Southside Landfill Joint Base Charleston Weapons Corrective Measures Implementation. Michael P. Healy, PG Cape Environmental Management Inc Program Manager December 4, 2013. What is the Site?.

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Solid Waste Management Unit (SWMU) 16 Old Southside Landfill Joint Base Charleston Weapons Corrective Measures Impleme

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  1. 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

  2. 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.

  3. JB CHS Weapons SWMU 16 Goose Creek SWMU 16 Site Location Cooper River

  4. 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 Torpedo Road Tidal marsh SWMU 16 Wilkinson Way Tidal marsh

  5. RCRA Process RCRA Facility Investigation (RFI) 2008 Corrective Measures Study (CMS) 2012 RCRA Facility Assessment (RFA) 1998 Permit Modification Remedy Selection 2012 We Are Here Corrective Measures Implementation (CMI) 2014 Operations and Maintenance 2014 – 2015 Permit Modification 2014

  6. 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

  7. Corrective Measures Implementation Major 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

  8. 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 Major Deliverables

  9. 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

  10. Proposed Wetlands Mitigation Area for SWMU 16 Proposed Mitigation Area Goose Creek 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

  11. Proposed wetlands mitigation area for SWMU 16 – Present site conditions

  12. Potential Wetland Mitigation Areas for the Master Plan

  13. Site Layout Storage/Staging Area Decontamination Pad Stabilized Construction Entrance Accessto Site

  14. Construction - Overview • Surface Debris Removal • PCB Hot Spot Removal • Diversion Swale Installation • Permanent Fence Installation • Interim Landfill Cover, with Geotextile • Final Landfill Cover • Restoration Fence Diversion Swale Surface Debris Removal Limit Landfill Cover Diversion Swale PCB Hot Spot

  15. 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

  16. 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

  17. 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

  18. Equipment Planned • Job site trailer • Dozer • Excavators • Loader • Compactor • Drill Rig • Roll-off Dumpsters

  19. Haul Route SWMU 16 • Wilkinson Way • Perimeter Road • Avenue B • Perimeter Road • Remount Road

  20. 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

  21. Questions?

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