724, Bériault, suite B,
Longueuil (Québec) J4G 1R8

1250, av. de la Station, casier 6
Shawinigan, Qc
G9N 8K9

François Hamel, geologist



Patrick Usereau, geologist



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Effective and economical solutions for today’s environmental problems.

Over the last decade, environmental assessment has become basically essential in both private and public sectors, whenever responsibility for the environment is a prime concern. It is of particular importance in the case of a transfer or financing of a property, for which the potential buyer and/or the approved lender wants to avoid the risk of being responsible for an environmental related problem.

SEDEXLAB offers a full range of services for industrial, commercial and residential sectors as specified in the following.


Phase I: Environmental Site Assessment (ESA)

Phase I of the environmental assessment of the site will determine the environmental condition of the site, based on a review of its past and current activities. The objective of this phase is to become familiar with a site, define the site’s issue based on available documents, and evaluate any past activities that would be likely to cause contamination. Phase I can be conditional to a sale, transfer or financing of a property, in order to determine compliance of the site. SEDEXLAB incorporated the CSA Z768-01 and Z769-00 standards in its assessment protocol.

For example, here are the elements dealt with during such an assessment:

Site’s history and current activities

  • Consultation and interpretation of maps and aerial photographs
  • Interpretation of the chain of titles for the studied site
  • Previous studies (environment, hydrogeology, geotechnics, etc.)
  •  Regional and municipal records (licenses, plans, surveys, etc.)
  • Provincial and federal records (prosecutions, complaints, certificate of approval, etc.)
  • Business records (survey certificates, plans, licenses, etc.)

Site visit and visual inspection (picture-taking)

  • Topography, drainage, back fill and debris
  • Soil condition, odors, vegetations
  • Underground tanks indices
  • Wells, public services, general maintenance, etc.

Informal interviews (owner, tenant, employees, neighbors, etc.)

  • Waste handling and disposal methods
  •  Underground tanks, hazardous material
  •  Wells monitoring, etc.

Phase II and Phase III: Environmental Site Assessment (ESA)

Phase II

In most cases, phase II, or exploratory characterization stage, is executed following the recommendations submitted in the Phase I report, if there are sufficient indications to suspect the presence of contamination. The objective here is to confirm the presence or the absence of contaminants and in the first case, determine the type. Further to a sampling campaign and physico-chemical analysis, the study will thereby make it possible to target contaminated sectors and to assess the extent of contamination to soils and groundwater.

Phase III

Once the presence of contamination has been confirmed, it becomes necessary to have an exhaustive characterization done, in order to set the boundaries of contamination with greater certainty, make an inventory of contaminated materials (volumes and concentrations) and assess the risks and impacts of contamination on the environment. Analytical data is obtained through a much more elaborated sampling campaign of the different contaminated mediums. Data is then assessed according to legislative environmental regulations that apply. This will also be done according to specific requirements from the client to help determine the options and budgets for the rehabilitation program of the contaminated site.

Site remediation

The rehabilitation of a site will be undertaken if it is determined that the site’s condition could result in financial or legal responsibilities, that contamination could carry some risk for human health, or that the site does not conform to legislative requirements. However, restoration can simply be done to increase the value of the property. A rehabilitation program putting forward various associated options and costs can be elaborated and submitted to the client. When it is finalized and adapted to the needs of the client (budgets and timelines), it will be referred to the appropriate legislative body.

SEDEXLAB is in a position to provide a full range of site rehabilitation services by methods of physical, physico-chemical and biological processes. Treatment for contaminated lands can be done on site or off site. Options on site include methods for active or passive in situ systems or by biopiles. Depending on each case, contaminated lands can be removed and thereafter, moved to an authorized site for ulterior treatment.