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,

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Presentation transcript:

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 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

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

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

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

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

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

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, Pinyon Env. Engineering, SWCA Env. Consultants, CSU Soils Laboratory SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

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

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

Divert Adit Discharge, Regrade 3H:1V (16,000 CY), Install Soil Cover Design Approach - Big Five Mine Dump SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Questions SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE