 |
Oklahoma Administrative Code (Last Updated: March 11, 2021) |
 |
TITLE 785. Oklahoma Water Resources Board |
|
Chapter 46. Implementation of Oklahoma's Water Quality Standards |
|
Subchapter 3. Implementation of Narrative Toxics Criteria to Protect Aquatic Life Using Whole Effluent Toxicity (WET) Testing |
SECTION 785:46-3-3. Sampling for whole effluent toxicity testing
Latest version.
- (a) Discharges with overlapping mixing zones may be combined, at the discretion of the permitting agency, and whole effluent toxicity tests may be required on the combined effluent. Samples shall be combined in proportion to the flow for each outfall. If some of the discharges are not toxic, combining discharges may allow intermittent toxicity if the discharge rates fluctuate. In these cases combined discharge testing will be disallowed. If the outfall originates from a lagoon with a retention time greater than 24 hours, composite samples may not be necessary. The permitting agency may determine that a grab sample near the discharge is sufficient.(b) The toxicity test must be initiated within 36 hours after sample collection. No sample may be held for more than 72 hours prior to use.