Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

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 practicable control technology currently available. BPT Effluent Limitations—Oil and Grease [In milligrams per liter] Pollutant parameter waste source Maximum for any 1 day Average of values for 30 consecutive days shall not exceed Residual chlorine minimum for any 1 day Produced water 72 48 NA Deck drainage ( 1 ) ( 1 ) NA Water-based: Drilling fluids ( 1 ) ( 1 ) NA Drill Cuttings ( 1 ) ( 1 ) NA Non-aqueous: Drilling fluids No discharge No discharge NA Drill Cuttings ( 1 ) ( 1 ) NA Well treatment, workover, and completion fluids ( 1 ) ( 1 ) NA Sanitary: M10 NA NA 2 1 M9IM 3 NA NA NA Domestic 3 NA NA NA Produced sand Zero discharge Zero discharge NA 1 No discharge of free oil. See § 435.41(y). 2 Minimum of 1 mg/l and maintained as close to this concentration as possible. 3 There shall be no floating solids as a result of the discharge of these wastes. [61 FR 66125, Dec. 16, 1996, as amended at 66 FR 6916, Jan. 22, 2001; 77 FR 29846, May 18, 2012]