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June 6, 2013

June 6, 2013. SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE. Nick Anton, CDM Smith Todd Bragdon, CDM Smith Mary Boardman, CDPHE Joy Jenkins, U.S. EPA Region 8 Chad Van Drie, CO Cleanup Corp. Introduction – Captain Jack Mill Superfund Site.

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June 6, 2013

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  1. June 6, 2013 SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Nick Anton, CDM Smith Todd Bragdon, CDM Smith Mary Boardman, CDPHE Joy Jenkins, U.S. EPA Region 8 Chad Van Drie, CO Cleanup Corp.

  2. Introduction – Captain Jack Mill Superfund Site • Remedial Design/Action (RD/RA) Project Team • CDM Smith; Engineering Design and Construction Administration • Colorado Department of Public Health and Environment;Lead Regulatory Agency • U.S. EPA Region 8; Supporting Regulatory Agency • Boulder County;Supporting Local Agency • Colorado Cleanup Corporation; Remedial Action Contractor • Previous RI/FS & ROD • Nature & Extent of Contamination • Selected Remedy • RD/RA Discussion Summary • Site Conditions • Design Approach • Construction Activities SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

  3. Site Location & Layout SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

  4. Site Conditions - Big Five Mine Dump Erosion (Head-cutting), Stormwater &Adit Discharge (Infiltration), Direct Exposure SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

  5. Site Conditions - Black Jack Adit & Captain Jack Mill SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Former Mill & Tailings Ponds & Adit, Direct Exposure, Boulder County Borrow Area

  6. Site Conditions - Residential Property & Philadelphia Mine SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Erosion, Direct Exposure

  7. Site Conditions – White Raven Mine SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Erosion, Direct Exposure

  8. Pre-Design Investigation Additional Data Collection to Support Design Geotechnical properties of mine waste Geotechnical/agronomic properties for borrow material characteristics and volumes Additional mine feature assessment (Cornucopia and Philadelphia Mines) Additional structural/features assessment including culverts, Mill building, debris volume, ACM, and septic system Additional cultural resource assessment Team Subcontractors: Geocal Inc., Advanced Terra Testing, PinyonEnv. Engineering, SWCA Env. Consultants, CSU Soils Laboratory SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

  9. Remedial Action Overview Remedial Action Objectives Reduce Exposure to Metals in Soil (Arsenic, Lead, and Thallium) Reduce Metals Loading to Groundwater from Surface Sources Reduce Instream Surface Water Metals Concentrations Remedial Goal: Lead in Soil < 380 to 860 mg/kg (Area Specific) Selected Remedy (2008 Record of Decision) Adit Water Diversion Removal of Mine Waste from Various Site Sources and Consolidate and Cover Mine Waste at the Captain Jack Repository Regrade and Cover Mine Waste at Big Five Mine Dump SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

  10. Remedial Action Overview Additional Reclamation Components Structure demolition Extend Black Jack Portal Sedimentation basins for adit water diversion system Run-on and runoff controls at repositories Cover systems - 12” subsoil and 12” growth media Restoration of excavated and disturbed areas 4-6” growth media, seeding, erosion controls Parent ground reclamation Willow and tree plantings Residential property septic system replacement Culvert replacement SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

  11. Design Approach - Big Five Mine Dump Divert Adit Discharge, Regrade3H:1V (16,000 CY), Install Soil Cover SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

  12. Design - Black Jack Adit & Captain Jack Mill Regrade Tailings Pond, Extend Portal, Consolidate Mine Waste (46,000 cy), Borrow Source, Install Soil Cover SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

  13. Design - Residential Property & Philadelphia Mine SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Relocate Residents, Remove Debris, Remove Mine Waste (6,000 cy), Restore Property

  14. Design – White Raven Mine SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Remove Mine Waste (12,000 cy), Restore Property

  15. Remedial Action – Big Five Mine Dump • Excavation and regrading mine waste, 2 ft soil cover SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

  16. Remedial Action – Big Five Mine Dump SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Run-on control; adit drainage ponds and discharge piping

  17. Remedial Action – Big Five Mine Dump SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Access and runoff controls

  18. Remedial Action – Big Five Mine Dump SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Runon controls and cornucopia mine reclamation

  19. Remedial Action – Captain Jack Area • Portal extension and lime amendment SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

  20. Remedial Action – Captain Jack Area SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Mill demolition, mine waste consolidation, borrow material preparation

  21. Remedial Action – Captain Jack Area SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Mine waste consolidation and 2-ft soil cover

  22. Remedial Action – Captain Jack Area SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Run-on controls

  23. Remedial Action – Captain Jack Area SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Runoff controls

  24. Remedial Action – Captain Jack Area SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Erosion controls and seeding

  25. Remedial Action – Residential Property SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Mine waste removal, culvert replacement, septic system replacement

  26. Remedial Action –Philadelphia Mine Dump SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Mine waste excavation, parent ground amendment, slash placement

  27. Remedial Action –Philadelphia Mine Dump SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Erosion control and seeding

  28. Remedial Action – Residential Property & Philadelphia Property Restoration – Growth media placement, seeding, erosion controls, sod, tree planting, willow stakes SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

  29. Remedial Action – White Raven Mine SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Mine waste removal; adit portal structural restoration and gate xxx

  30. Remedial Action – White Raven Mine SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE Restoration – Fill and rock placement, erosion controls, seeding

  31. Questions SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

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