Ontario Brownfields Risk Assessment

  1. As a core element of our business, NovaTox prepares risk assessments for brownfield properties under O. Reg. 153/04 (as amended), which provides for the filing of a Record of Site Condition in Ontario’s Environmental Registry. The regulation is administered by the Ontario Ministry of the Environment, Conservation and Parks (MECP), which oversees the conduct, review, and approval of risk assessments.

  2. All senior toxicologists at NovaTox are recognized by the MECP as Qualified Persons (QPRA) with the requisite training, experience, and credentials to conduct risk assessment in support of Records of Site Condition. NovaTox also provides expert advice and RSC risk assessment review services to the MECP.

  3. For many brownfield properties, risk assessment is a viable, less expensive alternative to removal or remediation of contaminated soil, groundwater, or sediment to meet the generic soil and groundwater standards. In many cases, the Property Specific Standards developed through a risk assessment process allow some or all contaminated media to remain at the property. Risk management measures may be required to interrupt exposure pathways and ensure receptors are not exposed to on-site contaminants at levels that might cause adverse effects.

  4. NovaTox risk assessors have completed risk assessments in support of Records of Site Condition at over 30 properties. Risk assessments have ranged in complexity and detail from Modified Generic Risk Assessments (MGRA), limited scope assessments of flow-through groundwater situations and comparison to background concentrations, to those at sites considered sensitive due to site conditions or adjacent ecological features.

  5. NovaTox uses the most up-to-date toxicological data and scientific methods to complete risk assessments in support of Records of Site Condition. We have a thorough understanding of the toxicological principles underlying the development of the MECP standards and will justify the use of alternative values where appropriate. We regularly use the fate and transport models favoured by the MECP for estimating the migration of contaminants to indoor environments and subsurface groundwater transport, as well as many proprietary models. Our scientists have experience with probabilistic/Monte Carlo analysis and other sophisticated methods available for use in risk assessment.