june 6, 2013 surface reclamation of the captain jack mill superfund site nick anton, cdm smith todd...
TRANSCRIPT
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June 6, 2013
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Nick Anton, CDM SmithTodd Bragdon, CDM SmithMary Boardman, CDPHEJoy Jenkins, U.S. EPA Region 8Chad Van Drie, CO Cleanup Corp.
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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
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Site Location & Layout
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
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Erosion (Head-cutting), Stormwater &Adit Discharge (Infiltration), Direct Exposure
Site Conditions - Big Five Mine Dump
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
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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
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Site Conditions - Residential Property & Philadelphia Mine
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Erosion, Direct Exposure
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Site Conditions – White Raven Mine
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Erosion, Direct Exposure
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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
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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
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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
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Divert Adit Discharge, Regrade3H:1V (16,000 CY), Install Soil Cover
Design Approach - Big Five Mine Dump
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
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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
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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
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Design – White Raven Mine
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Remove Mine Waste (12,000 cy), Restore Property
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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
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Remedial Action – Big Five Mine Dump
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Run-on control; adit drainage ponds and discharge piping
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Remedial Action – Big Five Mine Dump
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Access and runoff controls
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Remedial Action – Big Five Mine Dump
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Runon controls and cornucopia mine reclamation
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Remedial Action – Captain Jack Area
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Portal extension and lime amendment
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Remedial Action – Captain Jack Area
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Mill demolition, mine waste consolidation, borrow material preparation
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Remedial Action – Captain Jack Area
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Mine waste consolidation and 2-ft soil cover
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Remedial Action – Captain Jack Area
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Run-on controls
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Remedial Action – Captain Jack Area
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Runoff controls
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Remedial Action – Captain Jack Area
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Erosion controls and seeding
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Remedial Action – Residential Property
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Mine waste removal, culvert replacement, septic system replacement
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Remedial Action –Philadelphia Mine Dump
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Mine waste excavation, parent ground amendment, slash placement
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Remedial Action –Philadelphia Mine Dump
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Erosion control and seeding
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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
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Remedial Action – White Raven Mine
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Mine waste removal; adit portal structural restoration and gate
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Remedial Action – White Raven Mine
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE
Restoration – Fill and rock placement, erosion controls, seeding
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Questions
SURFACE RECLAMATION OF THE CAPTAIN JACK MILL SUPERFUND SITE