Understanding the Challenges

Initial Reaction and Escalation of the Spill 

During a spill, first responders may not always have the correct reflexes for mercury. Certain actions (sweeping, using a domestic vacuum, moving contaminated objects) can fragment the mercury, increasing dispersion and exposure. Without a rapid diagnosis, the situation can worsen and expand the area requiring treatment.

Migration and Volatilization within the Building 

Mercury migrates easily: it volatilizes, travels through air currents, and condenses on colder surfaces before re-emitting as temperatures fluctuate. Identifying "trap zones" (cracks, drains, baseboards, joints, equipment) requires significant experience to minimize the mobility of the contaminant.

Health, Safety, and Waste Management 

Mercury poses a significant toxicological risk. Incident management involves strict OHS requirements, containment, specialized cleaning, control measures, and the proper disposal of contaminated materials. Without traceability and post-decontamination validation, it can be difficult to justify a safe return to normal operations.

HDS Solutions for Mercury Spills

Rapid Diagnosis, Securing the Area, and Intervention Planning 

HDS conducts an inspection within 24 hours to establish a diagnosis, define the impact zone, and implement immediate measures: access control, containment, tailored ventilation recommendations, and prevention of high-risk actions. A rapid action plan and budget are provided to frame the intervention and limit further damage.

Physical and Chemical Decontamination Using Tailored Methods 

Our teams proceed with mercury recovery and the decontamination of affected surfaces and materials, combining physical techniques with specific chemical treatments when necessary. Interventions are adjusted based on surface types, accessibility (crevices, joints, drains), and building occupancy to ensure maximum efficiency.

Post-Cleanup Verification, Hazardous Waste Management, and Intervention Reporting 

Following decontamination, HDS performs a validation visit with control measures (air and surfaces) to verify work effectiveness and support re-occupancy. We also manage hazardous waste disposal through appropriate channels and produce a detailed report documenting actions, results, and recommendations.

The Benefits of Working with HDS

Rapid Reduction of Health and OHS Risks 

Specialized intervention from the outset limits exposure, reduces mercury dispersion, and secures occupants and responders through containment measures and proven methods.

Fast Re-occupancy and Minimal Operational Downtime 

By structuring the intervention (Diagnosis → Plan → Decontamination → Validation), we accelerate decision-making, minimize the scope of work, and facilitate a return to operations as quickly as possible.

Full Compliance and Incident Traceability 

Control measures, waste management, and intervention reports: you receive clear and defensible documentation to demonstrate due diligence, justify actions taken for potential insurance claims, and support regulatory compliance.

Service Information Sheet

Intervention with respect to various type of mercury spills, first inspection within 24 hours, proposal of an action plan and budget to decontaminate the premises, physical and chemical decontamination, post-decontamination visit including monitoring of residual mercury in air and on surfaces, intervention report.

For any emergency, please contact 514-922-0556

Typical Activities

  • Emergency interventions at all times and throughout the province of Quebec.
  • Quantification of spilled mercury, location of spills, measurement of mercury vapors, safety information to concerned parties.
  • Intervention with a vacuum cleaner equipped with an activated carbon filter, stabilizing liquid to "neutralize" residual mercury, personal protective equipment.
  • If required, negative pressure enclosure to contain contamination.
  • Cleaning of floors, walls, equipment, workstations, furniture, etc.
  • Recovery of mercury by vacuum, syringe or otherwise.
  • Removal of contaminated porous materials (baseboards, wooden boards, etc.) or vaporization of the stabilizing liquid to "neutralize" the micro-droplets of mercury that may have been deposited in the porosities of the materials (e.g. wood, concrete, etc.).
  • Preparation of a report to document the management of the spill with mercury vapor measurements before, during and after construction.

Some Relevant Projects

Private Sector

  • Decontamination of an instrumentation room in a Montreal plant, following a mercury spill due to overpressure in the manometers.
  • Supervision and supervision of demolition work carried out as part of the rehabilitation of a mercury-contaminated confined space.
  • Characterization of the contamination of a production plant following a mercury spill (material breakage), issuance of a decontamination estimate and monitoring of decontamination work.

Institutional Sector

  • Thermal power station in a hospital following the break-up of a Ledoux bell apparatus.
  • Decontamination in a hospital following the sterilization of a Maloney candle.
  • Decontamination of science laboratory premises in various schools in Montreal.
  • Decontamination of electrical transformer sites.
  • Inspection, monitoring of work and post-decontamination visit of a drinking water plant following a mercury spill in an ultraviolet reactor.

HDS Environment supports you in your operational, regulatory, and environmental challenges.

Our Services

Combining environmental expertise and industrial hygiene, HDS supports companies in the proactive management of risks and compliance. We protect your personnel and facilities through cutting-edge expertise and personalized guidance.