We all desire to live and work in an environment, where the land is composed of only what nature intended. This is not always the case.

Environmental Site Assessment

In the environmental industry an environmental site assessment (ESA) is a way to analyze the potential environmental impacts on any given property, specifically soil groundwater, sediment, and surface water. During commercial and industrial property transactions, it is in the best interest of all parties to obtain the input of expert environmental consultants, such as Oakhill, in order to conduct due diligence and identify potential environmental liabilities associated with a site. furthermore, the environmental Site Assessment process is a regulatory requirement to obtain a Record of Site Condition.


Expertise and Experience

Oakhill carries the qualified persons (QP) designation, as per regulation 153/04, which enables us to legally conduct Environmental Site Assessments.  Oakhill has worked on a variety of different projects, from completing Phase 1 ESAs for property transactions to complex Record of Site Condition filings involving remediation and/or risk assessments. 

Oakhill is a strong client driven environmental team that provides Environmental Site Assessments, to a broad range of clientele. Oakhill works with its clients in order to provide a staged approach assisting them in “Bridging the Gap to Compliance,” including:

  • Phase One Environmental Site Assessment (ESA) – The process of identifying any historical or current activities (on-Site or off-Site) that may impact the environmental condition of a site.
  • Phase Two ESA – Conducting intrusive sampling (i.e., soil, groundwater, soil vapour, sediment, and/or surface water) to assess the potential or known impacts to the environmental condition of a Site. 
  • Environmental Drilling & Monitoring – Utilization of in-house drills and drilling subcontractors to complete boreholes and groundwater investigations as part of  Phase 2 ESAs.
  • Phase Three ESA (i.e., Remedial Efforts) – The evaluation of remedial options and implementation of an effect remedial strategy to address contamination identified during a Phase 2 ESA. 
  • Risk Assessment – A tool utilized to assess existing contamination (i.e., after Phase Two and/or Phase Three work has been completed), and determine the level of risk to human and ecological receptors. A Screening Level Risk Assessment (SLRA) is typically completed to support due diligence projects (excluding Records of Site Condition), where as a Risk Assessment (RA) is completed to support a Record of Site Condition filing.
  • Record of Site Condition – Submission of Conceptual Site Model to the Ministry of the Environment, Conservation and Parks, following completion of the ESA process to support a change of property use (i.e., development permitting requirements).


It is through the above services that Oakhill is able to satisfy the client’s project requirements, utilizing regulations & guidelines from:

  • Canadian Council of Ministers of the Environment (CCME)
  • Canadian Standards Association (CSA)
  • Environment Canada (EC)
  • Ministry of the Environment, Conservation and Parks (MECP)

If you are seeking more information related to our ESA services, please contact Oakhill Below or give us a call, we would be happy to provide you with a FREE no obligation quote.