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→Sizing
[[File:OGS Calculation Tool 2024.png|thumb|450px|link=https://wiki.sustainabletechnologies.ca/images/5/57/OGS_Review_Sheet_2024-02-05.xlsx|This is a screenshot of the latest version of STEP’s OGS Review Sheet Calculator. The calculator has been developed to facilitate use of ISO 14034 ETV verified test data using a standard approach for all OGS MTD designs.]]
[[File:OGS Calculation Tool 2024.png|thumb|450px|link=https://wiki.sustainabletechnologies.ca/images/5/57/OGS_Review_Sheet_2024-02-05.xlsx|This is a screenshot of the latest version of STEP’s OGS Review Sheet Calculator. The calculator has been developed to facilitate use of ISO 14034 ETV verified test data using a standard approach for all OGS MTD designs.]]
It is recommended that a standard sizing approach be used for all OGS units to ensure they are evaluated based on a consistent methodology. The attached OGS Review Calculator has been developed to facilitate application of ISO 14034 ETV test data through a standard approach applicable to all OGS MTD designs. The following methods and processes are built into the tool:
It is recommended that a standard sizing approach be used for all OGS units to ensure that they are evaluated based on a consistent methodology. The OGS Review Calculator provided here has been developed to facilitate application of ISO 14034 ETV test data through a standard approach applicable to all OGS MTD designs. The Calculator is intended to be completed by municipal development review staff or their consultants to:
# ''Assess proposed OGS device sizing relative to treatment objectives;''
# ''Determine whether a proposed OGS device is to be installed in-line or off-line;''
# ''Verify oil and light liquid capture capabilities for proposed OGS devices;''
# ''Estimate maintenance intervals, and;''
# ''Check whether proposed unit model sizes that differ from the ISO 14034 verified unit are scaled appropriately (as per the scaling rules provided in the previous section).''
While more complex modelling methodologies may be used for sizing OGS devices, the final sizing recommendation should be consistent with or more conservative than that generated using the OGS Review Calculator, as the latter includes factors of safety and assumptions are more transparent. If less conservative sizing results from more refined modelling methods are to be accepted, a clear and concise rationale should be provided by the proponent to explain the key differences in assumptions and input parameters.<br>
The following methods and processes are built into the tool:
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