Recognized by
Call Us: (905) 761-1783
Home Services Training
CareersLinksContact Us
Environmental Site Assessments and Record of Site Condition
Phase I Environmental Site Assessment ("ESA") has become an integral part of due diligence on the site conditions for residential, commercial and industrial properties. Envirovision Inc. performs Phase I ESAs in accordance with the Ontario Regulation (O. Reg.) 153/04 and the Canadian Standards Association Standard Z768-01 to identify historical, actual or potential site contamination in Toronto, GTA and Ontario.

A Phase I ESA of your property involves the systematic gathering of information to identify actual or potential contamination, or source of contamination. A phase I ESA may include but is not limited to:
  • Reviews of the property histories through the use of aerial photographs, insurance maps, land title searches, municipal and provincial archives, etc.
  • Interviews with present and/or past occupants, present and/or past neighbors, and government officials.
  • Site visit to verify any discrepancies noted in the historical information or the review process.
  • Regulatory and deed searches on the site.
A Phase I ESA does not regularly involve sample collection or analysis.

  • Phase I ESA helps reduce uncertainty about potential environmental liabilities. One does not want to invest in a property that can become a liability once becoming its owner. 
  • Phase I ESA report can be used to make informed decisions about real estate and/or financial transactions (selling, purchasing or refinancing the property).
  • Phase I ESA is used to identify certain baseline environmental conditions, to assist in meeting regulatory requirements and as an initial step in site remediation.
  • Phase I ESA can be used as a basis for further investigation of the residence. If a phase I ESA reveals potential for contamination on the Site or surroundings, a Phase II ESA becomes necessary. 
Envirovision undertakes Phase I ESAs for Toronto, GTA and Ontario properties to determine if evidence of environmental conditions associated with the past and present land uses is present at the Site.  The results of these investigations are being used by clients to assist with real estate and/or financial transactions (selling, purchasing or refinancing the property). Our reports offer extensive and comprehensive knowledge about the Site and surrounding areas characteristics, site's past and current use, physiographic and geological information, historical information, current practices at the site (including waste, materials handling and storage, air pollution controls, and/or potential hazardous materials), etc. Based on the review and evaluation of the information received, we provide clients with our findings and conclusions regarding the presence or absence of potential contaminating activities on the Site and/or surroundings. Envirovision employs only experienced environmental engineers, geologists, technicians, and other specialists with the experience and knowledge necessary to identify existing or potential hazardous conditions. Following best engineering practices, our team can assist clients in understanding and meeting Ontario regulations with peace of mind. Envirovision performed more than 500 Phase I ESAs in Toronto, GTA and Ontario.


Envirovision performs Phase II ESAs for Toronto, GTA and Ontario properties to determine the nature and extent of any potential contamination at a property. Based on recommendations provided in the initial assessment (Phase I ESA), we develop a soil and water sampling program for Phase ll ESA of your property to be conducted at the site by staff together with subcontractors. The sampling strategy of Phase ll ESA of your property may include the evaluation of adjacent properties if previous information indicates that there is a potential for off-site contaminant migration towards the site under investigation. We subcontract services only to knowledgeable professional drilling companies that have previous experience working with Environmental Site Assessments in Toronto, GTA and Ontario.

The purpose of a Phase II ESA is to evaluate the environmental condition of the subsurface soils and/or groundwater on the site in the areas of potential environmental concern ("APECs") corresponding to the findings of the Phase I ESA. A standard Scope of work can include, but is not limited to:
  • conduct a site inspection to determine borehole locations;
  • advance a number of boreholes as pre-determined;
  • collect soil samples at regular intervals starting from the ground surface;
  • screen the collected samples based on visual and olfactory inspections, and/or field total organic vapours ("TOVs") concentration measurements;
  • submit all or part of the soil samples collected to an accredited independent chemical testing laboratory for testing for potential contaminants including parameters required by applicable regulations;
  • collect a composite soil sample from the boreholes drilled and submit to the laboratory for leachate and/or other analysis that inform about the soils conditions;
  • complete part or all of the boreholes drilled on the Site as monitoring wells for the purpose of collecting groundwater samples, if groundwater was encountered;
  • collect a groundwater sample from each of the monitoring wells completed on the Site and submit to the laboratory for testing for potential contaminants including parameters required by applicable regulations;
  • prepare a report providing an evaluation of the data.
Based on laboratory results and field observations, Envirovision's investigation determines the presence, nature, level and extent of surface and subsurface contamination, and other site conditions. In our ESA reports we characterize and interpret this information to assess the potential risk to the site and/or adjacent residential properties. A Phase II ESA may be intrusive and require additional detailed sampling in order to delineate the horizontal and vertical extent of soil/groundwater contamination. If a contamination of the soils and/or groundwater on the site was identified during Phase Phase II ESA, the information can be used by the Client to determine the appropriate steps to remediate it. During the phase II ESA, we consider the possibility that contamination has migrated to the adjacent property; upon obtaining that property's owner approval, additional study could be completed to assess the extent of contamination and present solutions for remediation.

Envirovision is always ready to present our clients with clear options on how to proceed after contamination was identified at your property. We have performed more than 400 similar projects in Toronto, GTA and Ontario.


A Record of Site Condition (RSC) is required under the Environmental Protection Act (EPA) and Ontario Regulation ("O. Reg.") 153 as amended on January 1, 2014. As results of the amendments, a property owner is required to submit a clear and transparent RSC, including clear Environmental Site Assessment (ESA) requirements which reflect best practices. According to the Guide for Completing Phase Two Environmental Site Assessments under Ontario Regulation 153/04 dated July 2011, a RSC is "a report documenting the results of one or more ESAs of a property" that is filed electronically in the Environmental Site Registry ("ESR"). Soil quality standard defining the quality of soil must accompany a RSC.

A RSC becomes needed when the property owner considers changing the use of property from commercial/industrial to any of the following:
  • institutional
  • residential
  • parkland
  • agricultural
However, RCSs may also be requested by mortgage lenders and/or other financial institutions or even municipalities in circumstances other than the use of change (i.e. obtaining a loan or a plan permit). In any case, the change of use cannot be completed before a RSC is filed. Only Qualified Persons (QP) should be filling a RSC on property owner's behalf. Whether your site is located in Toronto, GTA, and/or Ontario. Envirovison is your best choice for this service.