SECTION 252:690-3-19. TREs, TIEs and WET limits

(a)   TRE and TIE. A TRE is required when persistent toxicity is demonstrated. When intermittent toxicity is demonstrated, DEQ may require a TRE/TIE.

(b)   WET limits. DEQ shall incorporate a WET limit into a permit for the species affected by whole effluent toxicity upon the completion of a TRE /TIE, unless DEQ determines that chemical-specific effluent limits or toxicity-specific management practices in accordance with OAC 252:690-3-27 are sufficient to comply with the narrative toxicity criterion and protect the designated use. DEQ may also incorporate a WET limit or chemical-specific effluent limits into a permit when reasonable potential is established.

(c)   Effective date of WET limit. The effective date of a WET limit or a chemical-specific limit may be deferred up to three (3) years from the date of completion of the TRE /TIE or the effective date of a permit, as applicable. The effective date of toxicity-specific management practices may be deferred up to one (1) year from the date of completion of the TRE /TIE or the effective date of a permit, as applicable.

[Source: Added at 19 Ok Reg 1721, eff 6-13-02; Amended at 24 Ok Reg 1542, eff 6-15-07; Amended at 26 Ok Reg 1962, eff 7-1-09; Amended at 28 Ok Reg 1316, eff 7-1-11; Amended at 30 Ok Reg 1097, eff 7-1-13]