Two (2) pathway modifiers (modified ecological protection and soil vapour screening levels) were also available in the original Approved Model. Users could also opt into six (6) RMMs in order to develop higher PSSs, which would still provide the same protection for human health and the environment as the generic site condition standards (generic standards). Specific phase two ESA work must be carried out (Schedule E, Table 4) to support modifying these parameters from the default values. distance to down-gradient surface water body, depth to highest annual water table, fraction of organic carbon, etc.). Users could modify 11 site specific parameters ( e.g. The Approved Model was first published for use in RAs in July, 2011. The Approved Model may be used at various stages of an RA for other purposes, such as project planning. Any work needed to modify an assumption within the model must be done in accordance with the Regulation ( i.e., sections 41, 42 and Table 4 of Schedule E), and must be completed before the MGRA is submitted. This User Guide assumes that a QP has already conducted or supervised and completed the phase one and two environmental site assessments ( ESAs) in accordance with the requirements of the Regulation. The updated Approved Model is available on the ministry’s website, and is dated (September 2016).Īlthough the Approved Model is relatively user friendly, there are some aspects for which guidance may assist the user considerably in generating the appropriate PSSs. The following is a suggested step-by-step guide for using the Approved Model when submitting an MGRA to the ministry for review. Introduction to the User Guide for the Approved Model For these reasons, the ministry provides a streamlined process for acceptance of PSS that are developed in risk assessments ( RAs) that rely solely on the Approved Model. The Approved Model permits users a limited ability to modify physical site characteristics ( e.g., distance to surface water body), modify certain pathways ( e.g., ½ solubility and S3 for subsurface workers) supported by analytical results/data and opt into risk management measures ( RMMs) ( e.g., surface capping), which are developed by the Ministry of the Environment and Climate Change (ministry). The Approved Model enables a Qualified Person ( QP) entitled to prepare or supervise a risk assessment ( QP RA, as described in section 6 of the Regulation) to develop PSS quickly and easily. This streamlined process uses the “Approved Model,” which is based on the model (a system of interconnected Excel spreadsheets) that was used to develop the generic site condition standards (Soil, Ground Water and Sediment Standards for Use Under Part XV.1 of the Environmental Protection Act - dated April 15, 2011). The Modified Generic Risk Assessment ( MGRA also referred to as “Tier 2”) provides a streamlined approach for developing property specific standards ( PSS) under Ontario Regulation 153/04 (Records of Site Condition ( RSC) – Part XV.1 of the Act), made under the Environmental Protection Act (the Regulation). Introduction to Modified Generic Risk Assessment Website: Ministry of the Environment and Climate Change Ontario Ministry of the Environment and Climate Change
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A copy of the relevant legislation and regulations should be obtained to determine the exact requirements, and a lawyer should be consulted on questions about the application or interpretation of them. It should be noted that any description of the legislative and regulatory requirements given in this Guide is for convenience only. Pour obtenir de l’aide en français, veuillez communiquer avec le ministère de l’Environnement au 416 327-6949. » « Cette publication hautement spécialisée n’est disponible qu’en anglais en vertu du règlement 441/97, qui en exempte l’application de la Loi sur les services en français.
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Ministry of the Environment and Climate Change