Phase 1B Bank Management Areas - Amazon S3 · Phase 1B Bank Management Areas Pre-Remedial Design...
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Phase 1B Bank Management Areas Pre-Remedial Design Bank Soil Investigation Former DuPont Waynesboro Site, Virginia Area of Concern (AOC) 4 April 5, 2016
Transcript of Phase 1B Bank Management Areas - Amazon S3 · Phase 1B Bank Management Areas Pre-Remedial Design...
Phase 1B Bank Management Areas Pre-Remedial Design Bank Soil Investigation
Former DuPont Waynesboro Site, Virginia
Area of Concern (AOC) 4
April 5, 2016
‒ Background ‒ Objectives ‒ Methodology ‒ Results ‒ Path Forward
Agenda
Phase 1B BMA – Pre-Design Bank Soil Sampling Page 2
Background
Phase 1B BMA – Pre-Design Bank Soil Sampling Page 3
– Phase 1B BMAs include city and private ownership
– Mixture of Primary and Secondary BMAs
– Phase 1A and 1B BMAs, account for ~ 90% of Hg bank loading from RRM 0-2
Objectives – Provide additional data to
refine loading estimates to inform Phase 1B BMA remedial designs
– Horizontal and vertical delineation within potential removal areas
– Close data gaps at Secondary BMAs
Page 4 Phase 1B BMA – Pre-Design Bank Soil Sampling
Methodology – Surficial soil transects – Top of bank cores – Close interval cores – THg analysis by EPA
Method 7471A
– Coordination with JMU for field testing of XRF technology
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Sample Locations – Reach 1
Phase 1B BMA – Pre-Design Bank Soil Sampling
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Sample Locations – Reach 2
Phase 1B BMA – Pre-Design Bank Soil Sampling
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Sample Locations – Reach 3
Phase 1B BMA – Pre-Design Bank Soil Sampling
Results – Collected 239 samples to a
maximum depth of 8.5’ BGS
– Data still pending
– Preliminary data review underway • Similar trends as Phase 1A BMAs • THg ranges from ND to >1,400 mg/kg • Maximum THg concentrations
generally found at depth
Page 9 Phase 1B BMA – Pre-Design Bank Soil Sampling
Path Forward – Finalize data review
– Update bank loading model
– Refine Phase 1B BMA boundaries (if necessary)
– Begin Phase 1B remedial design (~ Q3/Q4 2016)
Page 10 Phase 1B BMA – Pre-Design Bank Soil Sampling
