Sustainable Remediation of Dissolved Phase Hydrocarbons at an Active - PowerPoint PPT Presentation

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

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

History May 2012 May 2012 July 2012 October 2012 Benzene Water supply Initial Phase II Leak detection investigation/ testing = failed reported in ESA indoor air sump turbine potable water supply monitoring 10 MWs August 2015 July 2015 May 2014 April/July 2013 Remediation Water Supply Phase II ESA System Repaired Phase II ESA 5 MWs Installation 18 MWs October 2015 OPERATION AND Additional System MAINTENANCE Installation

Site Location

Site Detail - Utilities

Site Detail – Monitoring Wells

PHC & LNAPL Plumes

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

Conceptual Site Model

Remediation Infrastructure

Remediation Infrastructure

Water Line Replacement

Extraction Wells Lines 1 and 2

Extraction Wells Lines 1 and 2

Secured Compound

Monitoring Well Installation

Extraction Wells Lines 3 and 4

Results  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%

Groundwater Contours - Pre Treatment

Groundwater Contours – Post Treatment

HVCs – Pre Treatment

HVCs – Post Treatment

Overall PHC Reduction

Overall PHC Reduction

Overall PHC Reduction

Overall PHC Reduction

Conclusions  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  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