2022 SMART Toronto – March 31st, 2022

Iain Walton, Pinchin Ltd. & Vertex Environmental Inc.
Vapour Intrusion: An Environmental Contractor’s Perspective
Bio | Abstract | Presentation

Gerry Parrott, BlueFrog Environmental Consulting Inc.
When Contaminate Hydrogeology Intersects with Geotechnical Engineering
Bio | Abstract | Presentation

Jean Paré, Chemco inc.
Evolution of In Situ Chemical Oxidation
Bio | Abstract | Presentation

Mike Mazzarese, AST Environmental, Inc.
DNAPL Remediation Projects: Case Studies Using the CAT 100 Technology
Bio | Abstract | Presentation

DNAPL Remediation Projects: Case Studies Using the CAT 100 Technology

Sites with Dense Non-Aqueous Phase Liquid (DNAPL) are notoriously difficult to remediate. Advances with in-situ remediation methods and products in recent years has resulted in DNAPL remediation success. This presentation will provide a review of a new product, CAT 100 and its applications on chlorinated solvent sites with suspected or measured DNAPL. CAT 100, a biologically enhanced version of the Trap and Treat® BOS 100® technology, combines activated carbon impregnated with metallic iron, a complex carbohydrate (time release substrate), a consortia designed to degrade chlorinated solvents and a second consortia designed to breakdown the polymeric carbohydrate to monomeric fragments. These smaller substrate fragments are then efficiently used by the CVOC degraders. The science behind CAT 100 and project summaries with supporting lines of evidence for the degradation processes (e.g. dissolved gases and microbiological diagnostics) will be covered. Site 1. A former dry cleaning facility in Northern Europe, where a large PCE plume was impacting groundwater on and off-site. In 2017, CAT 100 and BOS 100® were applied as part of a large-scale remediation program after a large scale Remedial Design Characterization (RDC) was performed. Currently, a 95% average reduction in PCE concentrations has been observed in the monitoring wells located in the areas targeted by the remediation. Site 2. CAT 100 was successfully implemented as part of a combined remedies (BOS 100® and Sodium Permanganate were also applied) strategy to treat elevated levels of Trichloroethylene in a shallow fine grained aquifer at a former large industrial facility. Total chlorinated ethene (TCE, cis-1,2 DCE, and VC) concentrations in the source area have been reduced by over 97% in less than 12 months. Site 3. A former chemical plant that stored hydrogen peroxide, MIBC, PCE, acetone, ethanol, and diesel fuel was remediated using a phased combined remedies approach. The interim corrective action was completed in 2013-14 and included 1) an off-site in-situ permeable reactive barrier utilizing BOS 100® to capture dissolved impacts leaving the facility and 2) shallow soil mixing activated persulfate (lime activation) to mitigate unsaturated soil impacts adjacent to source media. In addition, five phases of CAT 100 injections have been completed at the site since 2016. Total solvent concentrations have been reduced 96-99% in the CAT 100 treatment areas to date.

Wayne Harris, Milestone Environmental Contracting Inc.
Methodologies Utilized for Contaminated Sediment Dredging, Thin Layer Capping, Isolation Capping, and Water Treatment. Randle Reef Sediment Remediation Project Stage 2
Bio | Abstract | Presentation

Methodologies Utilized for Contaminated Sediment Dredging, Thin Layer Capping, Isolation Capping, and Water Treatment. Randle Reef Sediment Remediation Project Stage 2

Located in the southwest corner of Hamilton Harbour, in the Port of Hamilton, the Randle Reef site is approximately 60 hectares (120 football fields) in size. The site contains approximately 695,000 cubic metres of sediment contaminated with polycyclic aromatic hydrocarbons (PAH) and other toxic chemicals – the largest PAH-contaminated sediment site on the Canadian Great Lakes. Impacted by historic operations this site has a legacy of a variety of past industrial processes dating back to the 1800s. There were multiple sources of contamination including coal gasification, petroleum refining, steel making, municipal waste, sewage and overland drainage. Environment and Climate Change Canada (ECCC) serves as the project lead and Public Services Procurement Canada (PSPC) provides technical and construction management, and procurement services. Setting: Active port; average total PAH concentration near 5,000 ppm with peaks over 73,000 ppm; Depth of Water: ranges from ~4 m to ~ 12 m; Sediment Depth: ranges from ~0.1 m to >3 m. This project included the design of a remediation plan that included constructing a 6.2 hectare Engineered Containment Facility (ECF) over the highly contaminated sediment (Stage 1) and using a combination of hydraulic and mechanical dredging to remove approximately 445,000 m3 of contaminated sediment and placing within the ECF (Stage 2). The ECF is made of double steel sheet pile walls with the outer walls driven to depths of up to 24 metres into the underlying sediment. The inner wall is sealed creating an impermeable barrier. The dredging of the contaminated sediments also involved the treating and dewatering the ECF to balance the water input into the ECF. This involved the design/build of a water treatment plant that would match the input of the dredging and balance the water level within the ECF. Dredging was followed by Thin Layer Capping of marginally contaminated sediment and Isolation Capping of the Stelco Intake/outfall channel sediments. Following the dredging the ECF will then be covered by a multi-layered environmental cap accompanied with consolidation and dewatering of the sediments (Stage 3). This presentation reviews the unique considerations and challenges faced following the discovery of contamination in a previously unidentified wetland that served as a key source of traditional medicine for the community. The problems within the wetland were further aggravated by high water levels and species at risk which introduced additional constraints to a final remedy. A phased approach was adopted that included source removal of impacts adjacent to the wetland from targeted areas and the completion of a risk evaluation and functional assessment of the wetland for successful management of the remaining impacted areas of the wetland. Further field data collection was necessary to address data gaps and included soil/sediment sampling and analysis of medicinal plants located in the wetland. Stakeholder collaboration (MBQ and Indigenous Services Canada) and the implementation of an environmental monitoring program during construction was critical to the success of the phased approach for the remediation and risk management of the wetland. In addition, in collaboration with MBQ, the planned excavation of impacted soil in heavily forested area was curtailed as risks were evaluated and a mitigation plan was incorporated into the design.

Marc Laliberté, Veolia Water Technologies
Methodologies Utilized for Contaminated Sediment Dredging, Thin Layer Capping, Isolation Capping, and Water Treatment. Randle Reef Sediment Remediation Project Stage 2
Bio | Abstract | Presentation

Methodologies Utilized for Contaminated Sediment Dredging, Thin Layer Capping, Isolation Capping, and Water Treatment. Randle Reef Sediment Remediation Project Stage 2

Located in the southwest corner of Hamilton Harbour, in the Port of Hamilton, the Randle Reef site is approximately 60 hectares (120 football fields) in size. The site contains approximately 695,000 cubic metres of sediment contaminated with polycyclic aromatic hydrocarbons (PAH) and other toxic chemicals – the largest PAH-contaminated sediment site on the Canadian Great Lakes. Impacted by historic operations this site has a legacy of a variety of past industrial processes dating back to the 1800s. There were multiple sources of contamination including coal gasification, petroleum refining, steel making, municipal waste, sewage and overland drainage. Environment and Climate Change Canada (ECCC) serves as the project lead and Public Services Procurement Canada (PSPC) provides technical and construction management, and procurement services. Setting: Active port; average total PAH concentration near 5,000 ppm with peaks over 73,000 ppm; Depth of Water: ranges from ~4 m to ~ 12 m; Sediment Depth: ranges from ~0.1 m to >3 m. This project included the design of a remediation plan that included constructing a 6.2 hectare Engineered Containment Facility (ECF) over the highly contaminated sediment (Stage 1) and using a combination of hydraulic and mechanical dredging to remove approximately 445,000 m3 of contaminated sediment and placing within the ECF (Stage 2). The ECF is made of double steel sheet pile walls with the outer walls driven to depths of up to 24 metres into the underlying sediment. The inner wall is sealed creating an impermeable barrier. The dredging of the contaminated sediments also involved the treating and dewatering the ECF to balance the water input into the ECF. This involved the design/build of a water treatment plant that would match the input of the dredging and balance the water level within the ECF. Dredging was followed by Thin Layer Capping of marginally contaminated sediment and Isolation Capping of the Stelco Intake/outfall channel sediments. Following the dredging the ECF will then be covered by a multi-layered environmental cap accompanied with consolidation and dewatering of the sediments (Stage 3).

Ben Sweet, QM Environmental
Lessons learned from one of the largest “Traditional” ZVI PRBs installed in North America
Bio | Abstract | Presentation

Lessons learned from one of the largest “Traditional” ZVI PRBs installed in North America

Permeable Reactive Barrier’s (PRB’s) using transitional metals such as Zero Valent Iron (ZVI) to target organic and inorganic contaminants in-situ have been in use since the mid-1990s. This approach for groundwater treatment has seen tremendous growth since its inception due to its reliability and cost-effectiveness. Reactive Barrier technologies have also expanded to include novel installation and deployment techniques as well as novel amendments to improve performance and target a wider range of contaminants. Even with all this growth, ZVI and the “traditional” approach remains a staple of the PRB marketplace. With an increasing demand for cost-effective groundwater management solutions, a growing number of professionals and stakeholders are turning to PRB-based solutions to meet their site goals. Fueled by the many success stories and abundance of available information, many consultants and their clients are tackling program design and installation from the comfort of their chairs. But are we looking at the installation of PRB’s through rose coloured glasses? What does it actually take to translate conceptual design into a successful solution in the field? The purpose of this talk is to share some of the lessons learned from the installation of one of the largest “traditional” ZVI PRBs completed in North America. The site is a former industrial facility with legacy chlorinated solvent issues (mainly TCE and daughter products). The management of off-site migration was a critical part of the CPU to facilitate site redevelopment. A critical RMM included the installation of a 400 m, ZVI based permeable reactive barrier system to control plume migration. The site conditions necessitated the creative use of multiple installation procedures; the wall was installed via a blended approach utilizing direct push injection and trenching techniques, to address the complex plume structure. In total, over 400,000 kgs of ZVI was installed across 335 m of linear injection points and 65 m of trenching to complete the PRB installation to depths of up to 9 meters. Our focus in sharing this case study will be down-to-earth and practical. How does a contractor actually install a PRB? What techniques are being used in the field and why? How can you creatively problem solve to address technical and logistical challenges? And most importantly, how do we balance these challenges while completing a project on time, on budget, and with the ultimate goal of an effective PRB installation.

Matthew Gardner, Willms & Shier Environmental
Getting Down and Dirty about Excess Soil Laws in Ontario and Beyond
Bio | Abstract | Presentation

Madiha Vallani, Willms & Shier Environmental Lawyers LLP
Getting Down and Dirty about Excess Soil Laws in Ontario and Beyond
Bio | Abstract | Presentation

Kevin French, Vertex Environmental
Evolution of the Contaminated Site Remediation Industry in Canada
Bio | Abstract | Presentation

George (Bud) Ivey, Ivey International Inc.
Combining Advanced In-Situ Remedial Technologies to Mitigate Free Phase Hydrocarbons Trapped Below Structure
Bio | Abstract

Combining Advanced In-Situ Remedial Technologies to Mitigate Free Phase Hydrocarbons Trapped Below Structure

Eric Raes (E&LP, Clinton, NJ), Kerry Sublette, Ph.D. (Bio-Enhance, High Bridge, NJ), Duane Guilfoil, Derek Pizarro (AST Environmental, Midway, KY), George Ivey (Ivey International, Surrey, British Columbia, Canada)” Background/Objectives: Free phase petroleum hydrocarbons are extremely difficult to mitigate especially when released immediately adjacent to structures because the product migrates and accumulates as sorbed, globule, and free phases throughout the more permeable fill material surrounding the structure and utility conduits. A treatment train of three proven technologies was employed to remediate the readily available free phase product and promote subsequent biodegradation: (1) surfactants to enhance hydrocarbon desorption and dissolution allowing for push-pull mass recovery, (2) sorption of residual contaminants to a microbial-inoculated activated carbon-based amendment for stabilization and enhanced biodegradation, and (3) sustained bio-augmentation via in situ bio-reactors to expedite the enhanced bio-degradation component of the remedial strategy. Approach/Activities: Prior to this three-pronged treatment approach, a fifteen-point remediation well network had been installed as part of the previous remediation plan that was suspended due to the presence of free phase product. Subsequently, a series of enhanced fluid recovery events over a two-year period. When these events failed to eliminate the free phase product at the site, the treatment train approach was implemented as the revised remedial strategy. In order to remove the free phase petroleum and significantly reduce contaminant mass to be treated by the subsequent remediation technologies, a series of push pull surfactant injections and extractions were implemented in the spring of 2020. More specifically, approximately 265 gallons of 2% or 4% Ivey-sol®/water mixture were injected and subsequently vacuum extracted after 48 hours of aquifer contact. Once the available free product was removed, 3,300-lbs of BOS 200® and 2,000-lbs of gypsum were injected into the subsurface between the existing remediation wells. BOS 200® is a Trap & Treat® in situ remediation technology containing carbon-based media and a non-indigenous, proprietary bio-inoculum. Following BOS 200® injection, Bio-Enhance In-Situ Bio-Reactors (ISBRs) were installed in three (3) of the remediation wells. Through the extensive well network, the shifts in chemical, geo-chemical, and microbial populations were quantified throughout the remedial phases. Results/Lessons Learned: The Ivey-sol® surfactant flush events achieved the remedial objective to remove the readily available free product and facilitate the enhanced bio-degradation elements of the remedial strategy. The concentrations and migration of the petroleum degrading bacteria following the BOS 200® injection were quantified over a one-year period. These shifts in the petroleum degrading microbial community were compared to the abundance and migration of the indigenous microbial community based on the presence of three ISBRs on the north side of the treatment cell. The synergetic efficiency of these combined remedial technologies will be presented.