Conferences and Presentations

  • Huber, G, Knafla, A.  2021.  Subsoil Salinity Tool (SST) Version 3.0.  New Features and Modeling Upgrades to Optimize Guidelines and Reduce Remediation Volumes.  CLRA Alberta AGM & Conference.  February 24, 2021.

  • Huber, G, Knafla, A, Dinwoodie, G.  2021.  Updates and Upgrades to Subsoil Salinity Tool (SST) in Version 3.0.  AGAT Tech Talks.  March 12, 2021.

  • Huber, G, Knafla, A.  2020.  Subsoil Salinity Tool (SST) Version 3.0. Insights into Producing More Robust Guidelines with Lower Remediation Volumes.   Envirotech 2020.  Online.  June 12, 2020. 

  • Huber, G, Knafla, A, Mercado, J. 2019.  Subsoil Salinity Tool (SST) Update Version 3.0.  Key Changes to Guideline Calculations, Software Tool Use, and Data Collection.  Exova / Element 21st Environmental Seminar.  Calgary, Alberta.  February 1, 2019. 

  • Huber, G, Knafla, A, Mercado, J. 2019.  Subsoil Salinity Tool (SST) Update Version 3.0.  Key Changes to Guideline Calculations, Software Tool Use, and Data Collection.  Envirotech 2019.  Calgary, Alberta.  April 24, 2019. 

  • Huber, G, Knafla, A, Mercado, J. 2019.  Subsoil Salinity Tool (SST) Update Version 3.0.  Key Changes to Guideline Calculations, Software Tool Use, and Data Collection.  Exova / Element 21st Environmental Seminar.  Edmonton, Alberta.  April 26, 2019. 

  • Knafla, A. and J. Mercado. 2018. SCVF & GM Risk Ranking and Prioritization Tool. Wellbore Integrity Workshop, Calgary, AB. April 25th, 2018.

  • Knafla, 2018. Alberta Society of Professional Biologists. Panel Discussion moderator. April 10th, 2018. Cochrane, AB.

  • Huber, G, Knafla, A, Mercado, J.  2018.  Subsoil Salinity Tool (SST) Version 3.0.  SAR and Sodium Guidelines.  Calgary Environmental Network (CEN) Lunch and Learn.  Calgary, Alberta.  May 17, 2018.

  • Huber, G, Knafla, A.  2018.  Subsoil Salinity Tool (SST) Version 3.0.  SAR and Sodium Guidelines.  2018 CLRA Alberta AGM & Conference.  Red Deer, Alberta.  March 1, 2018.

  • Huber, G, Knafla, A.  2017.  Regulations and Industry Standards for Produced Water Management.  Canadian Shale Water Management 2017.  Calgary, Alberta.  September, 2017. 

  • McIvor, I. and A. Knafla. 2016. FWAL Chloride Criteria Development Update. April 21st. 2016 PTAC Soil and Groundwater Forum. The Calgary Petroleum Club, Calgary, AB.

  • Knafla, A. 2016. SST V3.0 Integrated Subsoil Chloride and Sodium/SAR. April 21st. 2016 PTAC Soil and Groundwater Forum. The Calgary Petroleum Club, Calgary, AB.

  • Knafla, A. and I. McIvor. 2016. Water Hardness and Chloride Toxicity towards Aquatic Life. 43rd Annual Canadian Ecotoxicity Workshop. September 25th, 2016. Edmonton, AB.

  • Knafla, A. and I. McIvor. 2016. Harnessing Wind Power for Remediation via Soil Vapour Extraction in Remote Areas. 2016 RPIC Federal Contaminated Sites National Workshop. April 25, 2016. Montreal, QB.

  • Huber, G. and A. Knafla. 2016. Final Alberta Boron Tier 1 guideline. April 21st. 2016 PTAC Soil and Groundwater Forum. The Calgary Petroleum Club, Calgary, AB.

  • Knafla, A. and I. McIvor. 2016. Harnessing Wind Power for Remediation via Soil Vapour Extraction in Remote Areas. 2016 Remediation Technologies Symposium (RemTech), October 2016. Banff, AB.

  • Huber, G, Knafla, A, McIvor, I, Kingston, H, Lintott, D. 2016.  New Tier 1 Boron Guideline for Alberta.  Federal Contaminated Sites National Workshop.  Montreal, Quebec.  April 25-27, 2016. 

  • Huber, G, Knafla, A, McIvor, I, Kingston, H, Lintott, D. 2015.  New Tier 1 Boron Guideline for Alberta.  Overall Guideline Development.  RemTech.  Banff, Alberta.  October 16, 2015.    

  • McIvor, I. and A. Knafla. 2015. Water Hardness and Chloride Toxicity to Aquatic Life. SETAC North America 36th Annual Meeting, Salt Lake city, Utah, USA. November 5th, 2015.

  • Knafla, A. and A. Dann. 2013. Tier 2B SST and 2C Subsoil Salinity Guidelines for an Oil and Gas Facility with Multiple Impact Areas, Near a River and Above a Shallow DUA, on Lands to be Developed into Residential Properties. CLRA/ACRSD 2013 Annual General Meeting, Red Deer, Alberta, February/March.

  • Knafla, A. and T. Prediger. 2013. Selenium: An Example of How Sedimentary Basin Soil Chemistry can Alter Environmental Risks of a Metalloid. Exova Environmental Seminar, Calgary, Alberta, February.

  • Kingston, H, Huber, G, Knafla, L. 2013.  Application of the Subsoil Salinity Tool (SST) and Other Novel Techniques to Salinity, SAR, Boron, and Hydrocarbon Impacts from Two Pipeline Spills in Peat Soils.  CLRA Annual Conference. Red Deer, Alberta.  February 28, 2013.   

  • Huber, G, Chidlaw, T, Panchyshyn, B.  2013.  Application of the Subsoil Salinity Tool and Subsoil SAR Risk Assessment to Problematic Remote Sumps Containing Cement Returns.  CLRA Annual Conference. Red Deer, Alberta.  February 28, 2013.

  • Knafla, A., Huber, G., Ranganathan, S. 2012. SST Version 2.5.3 – Refinement in Guideline Calculation and Functionality, Implications for Salt Impacted Site Remediation. (Presented at: 2012 PTAC Soil & Groundwater Forum Session).

  • Cull, K., Adams, A., Murimboh, J., Knafla, A., White, L. 2012. Evaluation of Biomarkers of Exposure to Arsenic from Well Water in Two Rural Nova Scotian Communities. (Presented at: 2011 94th Canadian Chemistry Conference).

  • Knafla, A., Huber, G., Ranganathan, S. 2012. SST Version 2.5.3 – Refinement in Guideline Calculation and Functionality, Implications for Salt Impacted Site Remediation. (Presented at: 2012 PTAC Soil & Groundwater Forum Session).

  • Cull, K., Adams, A., Murimboh, J., Knafla, A., White, L. 2012. Evaluation of Biomarkers of Exposure to Arsenic from Well Water in Two Rural Nova Scotian Communities. (Presented at: 2011 94th Canadian Chemistry Conference).

  • Prediger, T., Knafla, A., Cook, N. 2012. Soil Selenium Toxicity to Medicago sativa and the Hormetic Effect of Sulfate. (Presented at Alberta Innovates Technology Futures, January 11, 2012).

  • Prediger, T., Knafla, A., Woosaree, J. 2012. Considerations for Soil Selenium Guidelines and Results of Initial Plant Toxicity Testing (in preparation for RemTech 2012 Remediation Technologies Symposium, Banff).

  • Huber, GJ, Knafla, A., Vickerman, L., Bell, G. 2012. Progress Toward Subsoil SAR Guidelines: Synthesis of Leaching Column and Transport Modeling Work. (Poster presentation at the March 2012 PTAC Soil and Groundwater Forum, Calgary).

  • Huber, GJ, Knafla, A., Vickerman, L., Bell, G. 2012. Summary of Research on Sulfate Behavior in Soil and Groundwater: Implications for Subsoil Sulfate Guideline Development. (Presentation at the March 2012 PTAC Soil and Groundwater Forum, Calgary).

  • Lintott, D, Huber, GJ, Knafla, A., 2012. Progress Toward Boron Guideline Development: Update on Boron Toxicity Testing Results for Agricultural Soils plying Boron Research to Contaminated Sites (Presentation at the March 2012 PTAC Soil and Groundwater Forum, Calgary).

  • Ranganathan, S. and Knafla, A. 2012. Tier 2 Hydrocarbon Guideline Calculator (PTHC Version 1.0). Software Release and Demonstration. (Presented at: 2012 PTAC Soil & Groundwater Forum Session).

  • Huber, GJ, Knafla, A., 2011. Effects of SAR/EC Combinations on Hydraulic Conductivity and Water Transport: Implications for Subsoil SAR Guideline Development Work. (Presentation at the March 2011 PTAC Soil and Groundwater Forum, Calgary).

  • Huber, GJ, Knafla, A., Bacchus, P., Sabo, E., 2011. Study of the Fate and Transport of Calcium Sulfate (Gypsum) Concentrations in Shallow Soil. (Poster presentation at the March 2011 PTAC Soil and Groundwater Forum, Calgary).

  • Huber, GJ, Knafla, A., Vickerman, L., 2011. Progress Toward Updated Subsoil SAR Remediation Guidelines Below the Root-Zone. (Presented at RemTech 2011 Remediation Technologies Symposium, Banff).

  • Huber, GJ, MacDonald, J., Knafla, A., 2011. Applying Boron Research to Contaminated Sites (Presented at Imperial Oil 2011 Surplus Property Management (SPM) Conference, Calgary).

  • Lintott, D, Huber, GJ, Knafla, A., 2011. Progress on Boron Guideline Development: Update on Toxicity Testing and Methodology (Poster presentation at the March 2011 PTAC Soil and Groundwater Forum, Calgary).

  • Knafla, A., Hays, S., Campbell, J., Morden, M. 2011. Assessment of Benzene Shower Exposure – Implications for Soil & Water Quality Guideline Development. Poster Presentation – Abstract Number/Poster Board Number: 1266/837. Society of Toxicology (SOT) 50th Annual Meeting, Washington, DC.

  • Knafla, A. 2011. Subsoil Salinity Tool Introduction. (Presented at: Environmental Interactive Club, Calgary, AB.)

  • Ranganathan, S., Knafla, A. 2011. Petroleum Hydrocarbon Tier 2 Remediation Guideline Calculation Software. (Presented at: Remtech 2011, Banff, AB).

  • Knafla, A. 2011. Inhaled n-Hexane – Human Health Risks and Emerging Guidelines. (Presented at: CPANS 2011 Annual Conference Exploring Emerging Air Issues in Alberta).

  • Knafla, A., Hays, S. 2011. Assessment of Shower Exposures - New Health Canada Pathway for Guideline Development – Case Study with Benzene Sourced from Groundwater (Presented at: WaterTech 2011, Banff, AB).

  • Ranganathan, S., Knafla, A. 2011. Petroleum Hydrocarbon Tier 2 Remediation Guideline Calculation Software. (Presented at RemTech 2011 Remediation Technologies Symposium).

  • Knafla, A., Huber, GJ. 2011. Effects of SAR/EC Combinations on Hydraulic Conductivity Implications for Subsoil SAR Guideline Development (Presented at: Exova Environmental Seminar 2011).

  • Knafla, A. 2010. Recent Developments/Revisions to the Contractor Report Prepared by A. Knafla on upcoming Soil and Dust Quality Guidelines for lead (Pb). (Presented to the Canadian Council for Ministers of the Environment, Banff, AB).

  • Knafla, A., Hays, S. 2010. Results from the Assessment of Shower Exposures to Benzene Sourced from Groundwater and Implications for Guideline Development. (Presentation at the March 2010 PTAC Soil and Groundwater Forum).

  • Huber, GJ, Vasilakos, K, Knafla, A. 2010. Effects of SAR on Hydraulic Conductivity and the Influence of Test Methods, EC, and Soil Compaction: Implications for Subsoil SAR Guideline Development Work. (Presentation at the March 2010 PTAC Soil and Groundwater Forum).

  • Huber, GJ, Knafla, A., 2010. Fate and Transport and Sodium Chloride, Calcium Sulphate (Gypsum), Sodium Sulphate, and Boron in Soil and Implications for Guideline Development Work. (Presentation at the March 2010 PTAC Soil and Groundwater Forum).

  • Huber, GJ, Chidlaw, T., Knafla, A. 2009. Boron Soil Quality Guidelines Re-evaluation. (Presentation at the Maxxam Spring Workshop, Mississauga).

  • Gibson, M., Guernsey, J., White, L., Knafla, T., Parsons, M., Dabek-Alotorzynska, E., Celo, V., King, G. 2009. Off-Site Fate and Transport of Airborne Arsenic-Laden PM2.5 from a Historic Gold Mine Tailings Site to Nearby Properties in Nova Scotia. (CMOS Congress 2009, Halifax, NS)

  • Huber, GJ, Knafla, A. 2009. Boron Research Project Updates (Presentations at the PTAC Boron Working Group meetings, Februrary 2008 – December 2009).

  • Huber, GJ, Knafla, A. 2009. Boron Soil Quality Guidelines Re-evaluation. (Presentation at the March 2009 PTAC Soil and Groundwater Forum).

  • Knafla, A., Huber, GJ, Ranganathan, S. 2009. Subsoil Salinity Tool Refinement and Introduction to Course Curriculum (Presentation at the March 2009 PTAC Soil and Groundwater Forum).

  • Huber, GJ, Knafla, A. 2009. History of the Boron Soil Quality Guideline and Why it Needs to be Re-Evaluated. (Presentation at the January 2009 Bodycote Environmental Seminar, Calgary & Edmonton).

  • Huber, GJ, Knafla, A. 2009. Evaluating Boron Risk to Environmental Receptors for Guideline Development. (Presentation at the February 2009 CLRA Conference and Annual General Meeting).

  • Knafla, A., Carey, J. 2009. Development of a Shower Exposure Model for Benzene – Background Work for Potential Recommended Update to the Recently Derived Drinking Water Guidelines (Presentation at the March 2009 PTAC Soil and Groundwater Forum).

  • Knafla, A, Carey, J. 2009. Lead (Pb): Upcoming Implications for Contaminated Sites Guidelines and Risk of Decreased Intelligence and Increased Coronary Heart Disease. (Presentation at the March 2009 CLRA conference).

  • Carey J, Knafla A. 2009. n-Hexane, Why is a Separate Guideline Being Developed and Why is it Being Considered for Oil and Gas Impacted Sites. (Presented at the March 2009 Petroleum Technical Alliance Canada Soil and Groundwater Forum and Poster Session).

  • Mitchell I, Knafla A, Carey J, Williams D, Yole M, Smith L. 2008. Development of a Human Health Soil Quality Guideline for n-Hexane. (Poster presentation at the April 2008 RPIC Federal Contaminated Sites National Workshop & Expo).

  • Knafla A, Petrovic S, Carey J, Rowat C, Richardson M. 2008. Dermal Cancer Risk Associate with Benzo[a]pyrene Soil Exposures Expressed on a Per Unit Surface Area Basis. (Poster presentation at the April 2008 RPIC Federal Contaminated Sites National Workshop & Expo).

  • Knafla, A. 2008. Subsoil Salinity Tool Tier II Applications, Investigation Requirements, Assumptions, and Training. (Presentation at the March 2008 CLRA Conference).

  • Knafla, A. 2008. Subsoil Salinity Tool (SST) Overview, Applications, Investigation Requirements, Regulatory Status (Presentation to the Canadian Association of Petroleum Producers).

  • Huber, GJ, Knafla, A. 2008. New Findings Towards Boron Soil Criteria Adjustment. (Presentation at the March 2008 PTAC Soil and Groundwater Forum).

  • Ranganathan, S, Knafla, A. 2008. Human Health Risk Associated with n-Hexane at Oil and Gas Facilities – A New Contaminant to be Evaluated at Contaminated Sites. (Presentation at the March CLRA conference).

  • Huber, GJ, Knafla, A. 2008. A Comparison of Boron Testing Methods for Risk Assessment and Remediation. (Presentation at the February 2008 CLRA Conference and Annual General Meeting).

  • Carey, J, Knafla, A, 2007. Modernized Approach for the Remediation of Boron and Salt Impacted Soils. (Presentation at the August 2007 CLRA conference, Halifax, NS).

  • Knafla, A. 2007. Modernized Approach for Salt Impacted Soils: Final Results and Conclusions (Presentation at RemTech 2007, Remediation Technologies Symposium).

  • Knafla, A, Stokes, D. 2006. Modernized Approach for the Remediation of Salt Impacted Soils. (Presentation at RemTech 2006, Remediation Technologies Symposium).

  • Knafla A., Phillipps, K., Brecher, R., Petrovic, S., Richardson, M. 2006. Development of a dermal cancer slope factor for benzo[a]pyrene. Regulatory Toxicology and Pharmacology. 45, 159-168.

  • Wright, M, Knafla, A. 2005. Integrated Remediation Approach at a Former Chemical Blending Facility: Excavation, Dual-Phase Extraction and Site-Specific Risk Assessment (Presentation at Remtech 2005, Remediation Technologies Symposium).

  • Knafla, A. 2004. Town of Cochrane Public Hearing. Risk Assessment of Human Health Risks Associated with Creosote and CCA Soil and Groundwater Impacts at the Proposed Multi-Family Dwelling Located in Cochrane, Alberta. (Completed on behalf of BRISBIN & SENTIS Engineering Inc.)

  • Knafla, T., Stein, W., Sevigny, J., and Serbin, L. 1999. Measurement of Subsurface Hydrocarbon Vapours at Upstream Oil and Gas Sites: Implications for Risk Assessment. (26th Aquatic Toxicity Workshop. Edmonton, AB).

  • Knafla, T., Oishi, C., Bowles, M., and Brewster, M. 1999. Multidiciplinary Approach for Evaluation of Salt Impacts on Wetland Ecosystems. (26th Aquatic Toxicity Workshop. Edmonton, AB).

  • Robins, G.L., Knafla., T.L., and Sevigny, J.H. 1999. Risk Assessment of Contaminated Sites in Northern Environments: Challenges to Conventional Risk Assessment. (26th Annual Aquatic Toxicity Workshop, Canadian Technical Report of Fisheries and Aquatic Species.

  • Robins, G.L., Knafla., T.L., and Sevigny, J.H. 1999. New Challenges Associated with Risk Assessment of Contaminated Sites in Northern Environments. (Assessment and Remediation of Contaminated Sites in Arctic and Cold Climates, ARCACC).

  • Sevigny, J.H., Knafla, T.L., Tindal, M.J., and Robins, G.L., 1998. The Importance of Volatile Aliphatic Hydrocarbons in Human Health Risk Assessment: Examples from Gasoline Stations in Western Canada. (Presented to Alberta Environmental Protection, Edmonton, AB).

  • Knafla, T. L., Sevigny J. H.. 1997. Assessment of human health risks from a light condensate plume migrating towards a rural residential development. In: Niimi, A., J., Parrott., J.L., Spry, D.J. eds. Proceedings of the 24th Annual Aquatic Toxicity Workshop. October, Niagara Falls, ON).

  • Knafla, T. L. and Sevigny, J. H., 1997. Remedial costing of a large oil and gas property transfer using generic Tier II criteria. (Canadian Prairie & Northern Section Air & Waste Management Association. Risk Based Approaches for Managing Environmental Issues for the Oil and Gas Industry. April 25, 1997. Kananaskis, AB).

  • Brown, G., Knafla, T. L., and Nerbas, M. 1996. Development of risk-based clean-up criteria at a wellsite in Alberta. (Society of Petroleum Engineers. International Conference on Health, Safety and Environment, New Orleans, Louisiana June 9-12, 1996).

  • Knafla, T. L., Treissman, D., and Davies, D. 1995. Risk Assessment for petroleum storage tank (PST) sites: a consultants perspective. (Groundwater Solutions, Edmonton, AB).

  • Ross, S.D., Rathgeber, J., Knafla, T., Hardisty, P. 1995. Choosing a Remediation Technology. (Presented at: Environment Council of Alberta Conference).

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