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Former DuPont Waynesboro Plant October 25, 2016
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Former DuPont Waynesboro Plant October 25, 2016
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Introduction Background Actions Completed Proposed Remedies Upcoming
Activities Ongoing Activities
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Background RCRA Facility Investigation (RFI) Conducted 2001 ‐ 2010 Approved in 2015 Findings Hg in former structures (SWMU’s 1 and 4) Sources have impacted storm sewer – outfall discharges Impacted groundwater limited to former Hg areas
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N
Outfall 011
Outfall 001
SWMU 1
SWMU 4
SWMU 7
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Actions Completed Interim Measures (2010) Sewer Investigation (2010) Railroad Ave Interim Measures (2014) RFI (approved 2015) Corrective Measures Study (2016)
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Proposed Remedies Hg source area Excavations – SWMUs 1 and 4 Capping – SWMUs 1, 4 and 7 Long Term Groundwater Monitoring – Technical
Impracticability (TI) – SWMUs 1, 4 and 7 Final Sewer Clean‐out – AOC 3 Institutional Controls ‐ SWMUs 2, 6, 17 and AOC 1
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Proposed Remedy – SWMU 1 Free Hg
Source Removals Asphalt Cap GW Monitoring (TI)
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Proposed Remedy – SWMU 4 Free Hg
Source Removals Cap, re‐ grading GW Monitoring (TI)
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Proposed Remedy – SWMU 7 Asphalt Cap GW
Monitoring (TI)
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Proposed Remedy – AOC 3 Cleanout,
re‐line, abandon
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Upcoming Activities Final Agency Approval of CMS – Statement of
Basis RCRA Permit Modification Corrective Measures Implementation (CMI) CMI Workplan CMI Design Report – additional permit
modification CMI Construction (anticipated in Fall 2017)
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Ongoing Activities Groundwater Monitoring Revised Program – Annual Sampling Outfall Monitoring Monthly Sampling at Outfalls 001, 011 Mercury Inspections
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Questions?
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