CANADIAN REGULATORY GUIDANCE FOR APPLICATIONS OF OIL-GRIT SEPARATORS IN STORMWATER TREATMENT
Oil-Grit Separators (OGS) have long been used in Canada in both stand-alone and pretreatment applications for stormwater quality treatment. As the term implies, OGS devices are intended for capture and retention of sediment and floatable hydrocarbons such as fuel and oil.
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However, there are many examples in Canada where a product has been marketed as an OGS device, but lacked sufficient independent testing and verification of the treatment performance claims. Additionally, many undersized devices have been installed due to overly aggressive and unrealistic sizing and scaling practices, only to perform poorly in the field.
In recognition of these pervasive problems, a broad Canadian stakeholder group recently developed rigorous testing and scaling protocols for OGS devices, and regulators across Canada are seeking guidance in how to apply the new information in their stormwater quality regulations.