Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).

§ 435.43 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).

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 InletNo discharge.
(B) Cook InletOil & GreaseThe 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 InletNo discharge.
(B) Cook Inlet:
Water-based drilling fluids, drill cuttings, and dewatering effluentSPP ToxicityMinimum 96-hour LC50. of the SPP Toxicity Test 4 shall be 3% by volume.
Free oilNo discharge. 2
Diesel oilNo discharge.
Mercury1 mg/kg dry weight maximum in the stock barite.
Cadmium3 mg/kg dry weight maximum in the stock barite.
Non-aqueous drilling fluids and dewatering effluentNo discharge.
Drill cuttings associated with non-aqueous drilling fluidsNo discharge. 5
Well Treatment, Workover and Completion Fluids:
(A) All coastal areas except Cook InletNo discharge.
(B) Cook InletOil & GreaseThe maximum for any one day shall not exceed 42 mg/l, and the 30-day average shall not exceed 29 mg/l.
Produced SandNo discharge.
Deck DrainageFree Oil 3No discharge.
Domestic WasteFoamNo discharge.
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