Except as provided in 40 CFR 125.30-125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT):
BAT Effluent Limitations
Stream | Pollutant parameter | BAT effluent limitations |
---|---|---|
Produced Water: | ||
(A) All coastal areas except Cook Inlet | No discharge. | |
(B) Cook Inlet | Oil & Grease | The maximum for any one day shall not exceed 42 mg/l, and the 30-day average shall not exceed 29 mg/l. |
Drilling Fluids, Drill Cuttings, and Dewatering Effluent:1 | ||
(A) All coastal areas except Cook Inlet | No discharge. | |
(B) Cook Inlet: | ||
Water-based drilling fluids, drill cuttings, and dewatering effluent | SPP Toxicity | Minimum 96-hour LC50. of the SPP Toxicity Test4 shall be 3% by volume. |
Free oil | No discharge.2 | |
Diesel oil | No discharge. | |
Mercury | 1 mg/kg dry weight maximum in the stock barite. | |
Cadmium | 3 mg/kg dry weight maximum in the stock barite. | |
Non-aqueous drilling fluids and dewatering effluent | No discharge. | |
Drill cuttings associated with non-aqueous drilling fluids | No discharge.5 | |
Well Treatment, Workover and Completion Fluids: | ||
(A) All coastal areas except Cook Inlet | No discharge. | |
(B) Cook Inlet | Oil & Grease | The maximum for any one day shall not exceed 42 mg/l, and the 30-day average shall not exceed 29 mg/l. |
Produced Sand | No discharge. | |
Deck Drainage | Free Oil3 | No discharge. |
Domestic Waste | Foam | No discharge. |
[61 FR 66125, Dec. 16, 1996; 62 FR 1681, Jan. 13, 1997, as amended at 66 FR 6917, Jan. 22, 2001; 77 FR 29846, May 18, 2012]