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Oklahoma Administrative Code (Last Updated: March 11, 2021) |
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TITLE 785. Oklahoma Water Resources Board |
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Chapter 46. Implementation of Oklahoma's Water Quality Standards |
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Subchapter 11. Implementation of Temperature Criteria to Protect Fish and Wildlife Propagation |
SECTION 785:46-11-5. Reasonable potential
Latest version.
- A permit limit for temperature is required if there is a reasonable potential that the temperature increase at the edge of the mixing zone is greater than 2.8°C. EPA Region 6 uses a reasonable potential factor to determine if there is a reasonable potential that concentration of a given substance will exceed the criterion. An analogous reasonable potential factor, Tf, will be used to determine if there is a reasonable potential that temperature will exceed the criterion by 2.8°C at the edge of the mixing zone. Tf is determined such that only approximately 5% of the observed temperatures are higher. Therefore, Tf is the upper 95th percentile of the effluent temperature distribution.