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Environmental Site Assessments

In Ontario there are two levels of Environmental Assessments, Phase I and II.

The purpose of a Phase I Environmental Assessment (ESA) is to assess the environmental condition of a property and determine whether there is a risk of potential environmental liability linked to existing or historical activities at the site. Phase I ESAs are typically carried out as a condition of real estate sales, financing, change of land use, or to identify potential site contamination.

A Phase I study will include:

  • a review of current and historical records – for example municipal/governmental files, public agency files, chain of title, aerial photographs, topographic and geological maps
  • a site visit or site visits to assess conditions, note any hazardous substance usage (chemical solvents, petroleum products, pesticides etc.) and evaluate any hazardous site history
  • conduct interviews of persons knowledgeable of the property history (past or present owners, tenants, property managers, neighbours)
  • a report that documents the findings and conclusions resulting from the study and detailing any recommendations

If the potential for contamination is discovered during the Phase I study then a Phase II ESA is required in order to confirm the presence of contaminates or to file a Record of Site Condition.

The purpose of a Phase II Environmental Site Assessment (ESA) is to define the nature and extent of contamination that may pose an environmental risk associated with the site. A Phase II is often initiated when potential environmental contamination has been identified in a Phase I ESA, or if the findings in a Phase I ESA are inconclusive and further investigation is needed.

A Phase II ESA is accomplished through an intrusive investigation; collection of soil and groundwater samples through drilled boreholes or test pits, and/or collecting fragments of building materials for formal analysis of various contaminants. For some types of property uses a Phase II ESA is mandatory. These include properties that currently operate or have formerly operated as gas stations, automotive service centres, dry cleaners, heavy industry, textile or chemical manufacturers.

A Phase II ESA may indicate a requirement for a remediation of an environmental liability based on recommendations made in the Phase II assessment.

A  remediation is specific to the site and can include removing the environmental concern or treating contamination on site (in-situ or ex-situ). One option is to leave it in place and develop a monitoring and evaluation program. Often a combination of these methods is chosen, depending on the particular circumstances of the environment and/or the needs of the client, while meeting the Standards required by the Environmental Protection Act.

Comco conducts ESAs to meet the requirements of CSA Standard Z768- 01 (November 2001), Phase I Environmental Site Assessment and in compliance with the requirements of Ontario Reg. 153/04. Our knowledgeable, experienced and qualified staff has conducted numerous Phase I and II ESAs and helped our clients navigate complex environmental regulations for more than 25 years. Our company is fully licensed and registered through the Technical Standards & Safety Authority, Fuels Safety Branch of the Province of Ontario.

LICENSES HELD

MOECC: ECA
Water Treatment - Waste Management
Bioremediation - Waste Management
Waste Disposal
Well Contractor – (Monitoring Wells)
ESA
Electrical Contractor
TSSA
Heating Fuels Contractor
Petroleum Contractor
PEO – C of A
Professional Engineers License
Association of Professional Geoscientists of Ontario

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Fuel / Process Design and Engineering
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Contaminated Soil Remediation
Contaminated Water Remediation

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Petroleum Services:
100 Welham Rd.
Barrie, Ontario, L4N 8Y4

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