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40 C.F.R. § 435.13

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

§ 435.13 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 125.30-32, 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

Waste source Pollutant parameter BAT effluent limitation
Produced waterOil & greaseThe maximum for any one day shall not exceed 42 mg/l; the average of daily values for 30 consecutive days shall not exceed 29 mg/l.
Drilling fluids and drill cuttings:
(A) For facilities located within 3 miles from shoreNo discharge. 1
(B) For facilities located beyond 3 miles from shore:
Water-based drilling fluids and associated drill cuttingsSPP ToxicityMinimum 96-hour LC50. of the SPP Toxicity Test 2 shall be 3% by volume.
Free oilNo discharge. 3
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 (NAFs)No discharge.
Drill cuttings associated with non-aqueous drilling fluids:
Stock Limitations (C16-C18 internal olefin)Mercury1 mg/kg dry weight maximum in the stock barite.
Cadmium3 mg/kg dry weight maximum in the stock barite.
Polynuclear Aromatic Hydrocarbons (PAH)PAH mass ratio 5 shall not exceed 1 × 10−5.
Sediment toxicityBase fluid sediment toxicity ratio 6 shall not exceed 1.0.
Biodegradation rateBiodegradation rate ratio 7 shall not exceed 1.0.
Discharge LimitationsDiesel oilNo discharge.
SPP ToxicityMinimum 96-hour LC50. of the SPP Toxicity Test 2 shall be 3% by volume.
Sediment toxicityDrilling fluid sediment toxicity ratio 8 shall not exceed 1.0.
Formation OilNo discharge. 9
Base fluid retained on cuttingsFor NAFs that meet the stock limitations (C16-C18 internal olefin) in this table, the maximum weighted mass ratio averaged over all NAF well sections shall be 6.9 g-NAF base fluid/100 g-wet drill cuttings. 10
For NAFs that meet the C12-C14 ester or C8 ester stock limitations in footnote 11 of this table, the maximum weighted mass ratio averaged over all NAF well sections shall be 9.4 g-NAF base fluid/100 g-wet drill cuttings.
Well treatment, completion, and workover fluidsOil and greaseThe maximum for any one day shall not exceed 42 mg/l; the average of daily values for 30 consecutive days shall not exceed 29 mg/l.
Deck drainageFree oilNo discharge. 4
Produced sandNo discharge.
Domestic WasteFoamNo discharge.
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