SLIDE 1 Sustainable Remediation of Dissolved Phase Hydrocarbons at an Active Fuel Service Station Using an Integrated In-Situ Remedial System
Barry Rakewich, P.Ag., EP Kyle Jackson, C.E.T. Nichols Environmental (Canada) Ltd. Jay Grosskleg, B.Sc. Kris Bradshaw, P.Eng. Federated Co-operatives Limited
SustainTech 2017
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Sustainable Remediation of Dissolved Phase Hydrocarbons at an Active Fuel Service Station Using an Integrated In- Situ Remedial System
Sustainable – minimize waste disposal Active – operational facility Integrated – multiple remedial options In-Situ – in the place
SLIDE 3 History
May 2012 Benzene reported in potable water supply May 2012 Water supply investigation/ indoor air monitoring July 2012 Initial Phase II ESA 10 MWs October 2012 Leak detection testing = failed sump turbine April/July 2013 Phase II ESA 18 MWs May 2014 Water Supply Repaired July 2015 Remediation System Installation August 2015 Phase II ESA 5 MWs October 2015 Additional System Installation
OPERATION AND MAINTENANCE
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Site Location
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Site Detail - Utilities
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Site Detail – Monitoring Wells
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PHC & LNAPL Plumes
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Approach
Integrated/multi-faceted Mechanical extraction of vapours and GW On-site treatment capability Air sparge delivery Nutrient/oxidant amendment delivery Eliminate disposal of impacted media ZERO DOWN TIME
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Conceptual Site Model
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Remediation Infrastructure
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Remediation Infrastructure
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Water Line Replacement
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Extraction Wells
Lines 1 and 2
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Extraction Wells
Lines 1 and 2
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Secured Compound
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Monitoring Well Installation
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Extraction Wells
Lines 3 and 4
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System operational for ~300 days during
2015 and 2016
On-site recovery and treatment of
~138,000 L impacted groundwater
Mechanical removal of ~3,000 KG of
PHCs
Dissolved phase PHCs concentrations
reduced by 84%
Results
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Groundwater Contours - Pre Treatment
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Groundwater Contours – Post Treatment
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HVCs – Pre Treatment
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HVCs – Post Treatment
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Overall PHC Reduction
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Overall PHC Reduction
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Overall PHC Reduction
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Overall PHC Reduction
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Mass mechanical removal of fluids/vapour
has been achieved
Evidence of bio-degradation occurring as
indicators of denitrification and anaerobic reduction are evident
Reaching the tipping point between
effective mechanical removal and transition to bio-degradation
Conclusions
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Continue fluid/vapour recovery into 2017 Utilize recovered and treated groundwater
for amendment preparation
Advantage: maintain consistency with native
groundwater chemistry and indigenous bacteria
Advantage: eliminate discharge requirements
System hardware can be utilized for
amendment delivery
Conclusions
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