PIMS: an Apatite II Permeable Reactive Barrier to Remediate ...
Mitigation of PCBs using Permeable Reactive ... - rpic-ibic.ca€¦ · Mitigation of PCBs using...
Transcript of Mitigation of PCBs using Permeable Reactive ... - rpic-ibic.ca€¦ · Mitigation of PCBs using...
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Mitigation of PCBs using Permeable Reactive Barrier Technology at Resolution Island from 2005 to 2013
Rutter, A., Kalinovich, I., Rowe, R.K., Jones, D., Plato, N., and Hooey, S.
Aboriginal Affairs and Northern Development Canada Affaires Autochtones et Développement du Nord Canada
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Surface Permeable Reactive Barriers for cold climates
Kalinovich I., Rutter, A., Poland, J.S., Cairns, G., Rowe, R.K. Sci Total. Env. (2008) 407: 53-66.
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RESOLUTION ISLAND
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BAF-5: Resolution Island • Main base 1300 ft
above sea level
• Part of the Pole-vault line
• Logistically challenging site
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Operational 1954 - 72 • 100-200 military workers
on site working on a six month rotation
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Initial Investigations • Site ownership to
AANDC 1976 • Short Range Radar
construc<on 1985 • Preliminary
inves<ga<ons 1987 • Queen’s University
ASU and Environmental Sciences Group at Royal Road Military College 1993
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Multiple Dump Sites, Hydrocarbons, Metals
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PCB Contamination at BAF-5 • 18 large transformers in S1/
S4 buildings plus 14 excavated from furniture dump
• 80 to 300 L of PCBs (36% to 72%) each
• Total of 4000 kg pure PCBs in oil
• Plus 5000 kg pure PCBs in soil in over 25,000 m3
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Polychlorinated Biphenyls • Good electrical insulating
properties very stable reduced fire risk
• Persistent organic pollutant
• Soluble in fat therefore bio-accumulates
• Some congeners carcinogenic in rats
• Create dioxins and furans when burnt in uncontrolled conditions
• Estrogenic effects other health issues
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S1/S4 BEACH
S1/S4 VALLEY
FURNITURE DUMP
Barrier Technology Applied at 3 Locations
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PCB Source Furniture Dump
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PCB Source S1/S4 Valley and Beach
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Beginning of Drainage Pathway
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S1/S4 Valley drainage pathway
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End of Drainage Pathway
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PCB Cleanup main site 1995 to 2006
1995 2006 Contractor: Qikiqtaaluk CorporaJon
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Soil RemediaJon > 50 ppm 1997-‐2006
§ Soil Excavation
§ Containerization
§ Ship South for incineration
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Excavation and Engineered Landfill (5 to <50 ppm)
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Why is barrier technology necessary?
1. High level PCBs trapped in fractured bedrock, loose soil despite vacuuming
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Why is barrier technology necessary? 2. PCBs >50 ppm in inaccessible areas all in a pathway directly leading to the ocean
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Technological Requirements • 85% of PCB mass are sorbed on to soil particles < 0.5 mm
• System must trap silt and fines but allow treated water to flow through unhindered i.e. not clog
• PRB must function in Arctic climate
Kalinovich I, Ru[er A, Rowe RK, McWa[ers R and Poland JS, “The ApplicaJon of GeotexJle and Granular Filters for PCB RemediaJon, Geosynthe)cs Interna)onal (2007) Vol 15, No. 3. pp 173-‐183. Kalinovich I., Ru[er, A., Poland, J.S., Cairns, G., Rowe, R.K., RemediaJon of PCB Contaminated Soils in the Canadian ArcJc: ExcavaJon and Surface PRB Technology. Sci Total. Env. (2008) 407: 53-‐66. Kalinovich. I. K., Ru[er, A., Rowe, R. K. and Poland, J. S. Design and applicaJon of surface PRBs for PCB remediaJon in the Canadian ArcJc, J. of Env. Management, 101:124-‐133 (2012)
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RESOLUTION ISLAND PCB BARRIERS
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PRB Filter Materials
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PCB RetenJon of Filters
Filter PCB retained (mg)
Woven Geotextile 400W 0.4
Woven Geotextile 800W 0.2
Nonwoven Geotextile 1200R 6.5
Hydrophobic Geosorbent 2.7
GAC2 360 Various filter materials and PCB retained (μg) by the 2003 Barrier System. GAC2 stands for Granulated AcJvated Carbon, Type 2.
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Final Barrier Design
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Half-height Nonwoven Geotextile
Half-height Nonwoven Geotextile
GAC GAC
Gravel Gravel
Half-height
Gravel
Half-height
Gravel
Final Filter System
Direction of
Flow
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Annual Monitoring
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S1/S4 Valley PRB Monitoring Results 2006-‐12
2006 2007 2008 2009/2010 2011 2012
Volume (m3) 2.2 1.0 2.6 2.5 0.5 2.5
ConcentraJon (ppm) 5.0 4.8 2.9 3.1 3.7 1.9
PCB Mass (g) 25 8.5 13.6 14 3.3 10.3
• ConcentraJon of PCBs < 5ppm and trending down • Currently planning to phase out gate and remove geosyntheJcs
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S1/S4 Valley PRB 2015/2016
• Remove liner system
• Excavate sediment
• Gabions lei intact
• Gravel only in gate
• Natural re-‐vegetaJon
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Re-‐vegetaJon and Soil StabilizaJon 2011
Moss is naturally re-‐vegetaJng the valley
Curlex traps will help stabilize soils.
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S1/S4 Beach barrier
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Beach Barrier Monitoring Results 2006-2013
2006 2007 2008 2009/2010 2011-‐2013
Volume (m3) 2.0 1.2 5.3 2.3 6.0
ConcentraJon (ppm) 0.7 0.6 1.6 1.5 0.62
Mass (g) 2.5 1.2 15.3 6.1 6.7 .
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Beach Barrier 2015/2016
• Excavate sediment from barrier • Replace filters in gate • Monitor sediment movement for 5 years
.
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S1/S4 BEACH
S1/S4 VALLEY
FURNITURE DUMP
Barrier Technology Applied at 3 Locations
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Furniture Dump Barrier
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FURNITURE DUMP BARRIER
2006 2007 2008 2009/2010 2011 2012
Volume (m3) 0.3 0.25 0.6 0.5
ConcentraJon (ppm) 29 37 78 53 101 77
Mass (g) 15.5 16.9 76 48
• ~1000 kg of CEPA soil trapped each year
• Concentrations >50 ppm
• Barrier will be rebuilt 2015
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FD Drainage pathway 2011
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FD Barrier Liner InvesJgaJons 2011
Samples Mass of Bentonite
Hydraulic ConducJvity
(g/m2) (m/s)
Virgin GCL 4100 4.7 x 10-‐11
Furniture Dump Top Layer 3290 8.2 x 10-‐9
Furniture Dump Bo[om Layer 2850 3.7 x 10-‐8
Holes in the geomembrane due to tensile stresses Significant decreases in bentonite mass
Significant increases in hydraulic conducJvity
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Furniture Dump Barrier 2015/2016
• Excavate sediment from barrier and drainage pathway
• Replace enJre barrier
• Further delineaJon to idenJfy source
• Leave in place and monitor for 5 years
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Thank you!