Sid Lethbridge Principal Emeritus

Sid Lethbridge is a Chemical Engineer with over thirty years of experience in environmental management and chemical process development. He has managed and conducted emission inventory development projects, air dispersion modeling studies, industrial site assessments, site remediation, environmental audits, preparation of Permit applications and facilitation of the approval process (Ontario, Quebec, Alberta), development of air pollution control equipment, odor evaluation studies of industrial plants and acquisition and divestiture due diligence programs. He was a major contributor to a chemical research and development program which culminated in the construction and commissioning of a commercial foam insulation product.

Project Experience

Environmental Compliance Approval, Licenses and Permits

Mr. Lethbridge has extensive experience in developing strategic approaches to obtaining an Environmental Compliance Approval (ECA) that ensure operational flexibility for the facility while clearly demonstrating the ability to maintain compliance with regulatory requirements both now and in the future.

Projects have included:

  • ECA with Limited Operational Flexibility (ECA with LOF) for multiple industries, including an unintegrated Steel Mini Mill, large Glass Fiber Insulation Manufacturing facility, Sintered Metal manufacturing facility; etc.
  • Major expansion of a sodium silicate manufacturing plant with multiple processes.
  • Thermal destruction device for condensate and exhaust from chemical reactors.
  • Complex consolidation of overlapping and conflicting Approvals for several large manufacturing plants resulting in greater operating flexibility.
  • Conversion of large industrial furnaces from air/gas to oxygen fired burners.
  • Large Bioremediation processes for a chemical and resin manufacturing facility including air and waste management approvals.
  • Carbon black manufacturing plant.
  • Fuel additives blending and processing plant.
  • Several pharmaceutical manufacturing facilities.

Emission Inventories

Mr. Lethbridge has developed the emission estimation module of the LEHDER Environmental Information Management Service (LEIMS). Based on the LEIMS module, emission inventories are created for a wide range of industrial facilities that allow the proponent to predict both short and long term emissions. He has prepared Emission Summary and Dispersion Modeling Reports to support both Environmental Compliance Approval applications and STAC submissions, annual emission estimate and reports for NPRI, and annual, smog season and quarterly reports for O. Reg. 127.

Some of his clients include:

  • Large refinery located in Sarnia, Ontario
  • Large petrochemical facility located in Corunna, Ontario
  • Large nitrogen based fertilizer manufacturer based in Courtright, Ontario
  • Glass fiber insulation manufacturing facilities in Ontario, Alberta and Quebec
  • Steel Mini Mill based in Cambridge, Ontario
  • Glass textile manufacturing facility based in Guelph, Ontario
  • Polyester resin manufacturer located in Guelph, Ontario

Process Assessments

Mr. Lethbridge has conducted process assessments of various operations to address specific concerns. Some of these assessments have included:

  • Conducted an evaluation of a furnace operation which included speciation and quantification of particulate emissions and particle size determination to determine causes of elevated opacity. The study determined that sodium sulphates present as tramp ingredients in the raw materials were the most significant contributor to opacity as a condensing fume.
  • Developed and demonstrated an air pollution control system which reduced particulate emissions by 30% through use of pollution prevention techniques.
  • Conducted pilot plant trials of wet ionizing precipitators to control emissions from thermoset polymer curing process. Trials culminated in the successful selection of scrubber which significantly reduced opacity and particulate emissions when installed in two manufacturing plants.
  • Prepared a mass balance for metals and elements on a nickel smelter to predict distribution of material inputs to product and various by-product and waste streams including air discharges. The outcome of the study is used for raw material selection and annual reporting to NPRI, Ontario Regulations 127/01 and 452/09 and the Toxics Reduction Act.

Odor Evaluation Studies

  • Managed odor evaluation of an Ontario chemical plant to develop the compliance program. Program included evaluation of process emissions for both odor strength and chemical definition, identification of prevention and control options, obtaining necessary approvals for control device and performance testing.
  • Conducted odor evaluation of large California insulation manufacturing facility to develop solutions to eliminate odor complaints. The program elements included ambient odor survey in neighborhood of plant, evaluation of process emissions for odor strength, modeling of multiple sources to prioritize emission sources for abatement plans, and identification of prevention and control options. A testing program identified the substance responsible for odorous emissions. A material substitution option was demonstrated to eliminate odor emissions. The solution has been successfully implemented; no odor complaints were received after the control measures were executed.
  • Conducted odor assessment of a corn processing facility to identify the sources that contributed to ground level odor off site.
  • Developed an odor abatement program at a large Central Ontario manufacturing facility to develop solutions to address odor complaints from an organized citizens group. A key element of the program was the development of an environmental complaint procedure to facilitate communications between concerned citizens and operating facility management. Solutions included extension and/or reorientation of stacks for improved dispersion, and material substitution to eliminate odorous materials.

Air Dispersion Modeling

Mr. Lethbridge has performed and managed air dispersion modeling studies using regulatory models. Most of these studies have required the development and assessment of potential solution options to maintain or obtain compliance with regulatory standards or corporate objectives.

Facilities assessed include petrochemical refineries, carbon black manufacturing facility, glass fiber insulation manufacturing facilities, steel mini mill, glass textile manufacturing facility, large appliance manufacturing plant, surface metal plating chemical manufacturer; sodium silicate plant, uranium refining facility; etc.

Jurisdictions where the modeling studies were undertaken include:

  • Ontario
  • Quebec
  • Alberta
  • Texas
  • California
  • Wyoming

Property Liability Management

Property Stewardship:

  • Conducted proactive assessment of a large manufacturing complex which identified poor material storage and handling practices that could potentially contribute to significant liability in the event of a spill or release.

Education and Professional Membership

B.A.Sc. Chemical Engineering, University of Waterloo, 1979
Member, Air and Waste Management Association
Member, Professional Engineers of Ontario
Trainer, Environmental Compliance Approval, Air Dispersion Modeling, NPRI and O. Reg. 127 Reporting, etc.