Effluent limitations attainable by the application of the best practicable control technology currently available (BPT).

(a) Except as provided in 40 CFR 125.30 through 125.32 or § 437.40(b), any existing facility subject to this subpart which combines treated or untreated wastes from subparts A, B, or C of this part may be subject to Multiple Wastestream Subcategory effluent limitations representing the application of BPT set forth in paragraphs (b), (c), (d), or (e) of this section if the discharger agrees to the following conditions in its NPDES permit: (1) The discharger will meet the applicable Multiple Wastestream Subcategory limitations set forth in (b), (c), (d) or (e); (2) The discharger will notify its NPDES permit writer at the time of renewal or modification of its permit, of its desire to be subject to the Multiple Waste Subcategory by submitting to the NPDES permit writer an initial certification statement as described in § 437.41(a); (3) The discharger will submit to its NPDES permitting authority a periodic certification statement as described in § 437.41(b) once a year; and (4) The discharger will maintain at the office of the facility and make available for inspection the on-site compliance paperwork as described in § 437.41(c). (b) Combined waste receipts from subparts A, B, and C of this part. (1) As provided in § 437.42(a), any existing point source subject to this paragraph must achieve the following effluent limitations representing the application of BPT: BPT Limitations Regulated parameter Maximum daily 1 Maximum monthly avg. 1 Conventional Parameters BOD 5 163 53.0 O&G 127 38.0 pH ( 2 ) ( 2 ) TSS 74.1 30.6 Metal Parameters Antimony 0.249 0.206 Arsenic 0.162 0.104 Cadmium 0.0172 0.0102 Chromium 0.746 0.323 Cobalt 0.192 0.124 Copper 0.500 0.242 Lead 0.350 0.160 Mercury 0.00234 0.000739 Nickel 3.95 1.45 Silver 0.120 0.0351 Tin 0.409 0.120 Titanium 0.0947 0.0618 Vanadium 0.218 0.0662 Zinc 0.497 0.420 Organic Parameters Acetone 30.2 7.97 Acetophenone 0.114 0.0562 Bis(2-ethylhexyl) phthalate 0.215 0.101 2-Butanone 4.81 1.85 Butylbenzyl phthalate 0.188 0.0887 Carbazole 0.598 0.276 o -Cresol 1.92 0.561 p -Cresol 0.698 0.205 n-Decane 0.948 0.437 Fluoranthene 0.0537 0.0268 n-Octadecane 0.589 0.302 Phenol 3.65 1.08 Pyridine 0.370 0.182 2,4,6-Trichlorophenol 0.155 0.106 1 mg/L (ppm). 2 OSC Within the range 6 to 9. (2) The following in-plant limitations apply to metal-bearing wastewater containing cyanide: In-Plant Limitations Regulated parameter Maximum daily 1 Maximum monthly avg. 1 Cyanide 500 178 1 mg/L (ppm). (c) Combined waste receipts from subparts A and B of this part. (1) As provided in § 437.42(a), any existing point source subject to this paragraph must achieve the following effluent limitations representing the application of BPT: BPT Limitations Regulated parameter Maximum daily 1 Maximum monthly avg. 1 Conventional Parameters O&G 127 38.0 pH ( 2 ) ( 2 ) TSS 74.1 30.6 Metal Parameters Antimony 0.249 0.206 Arsenic 0.162 0.104 Cadmium 0.0172 0.0102 Chromium 0.746 0.323 Cobalt 0.192 0.124 Copper 0.500 0.242 Lead 0.350 0.160 Mercury 0.00234 0.000739 Nickel 3.95 1.45 Silver 0.120 0.0351 Tin 0.409 0.120 Titanium 0.0947 0.0618 Vanadium 0.218 0.0662 Zinc 2.87 0.641 Organic Parameters Bis(2-ethylhexyl) phthalate 0.215 0.101 Butylbenzyl phthalate 0.188 0.0887 Carbazole 0.598 0.276 n-Decane 0.948 0.437 Fluoranthene 0.0537 0.0268 n-Octadecane 0.589 0.302 1 mg/L (ppm). 2 Within the range 6 to 9. (2) The following in-plant limitations apply to metal-bearing wastewater containing cyanide: In-Plant Limitations Regulated parameter Maximum daily 1 Maximum monthly avg. 1 Cyanide 500 178 1 mg/L (ppm). (d) Combined waste receipts from subparts A and C of this part. (1) As provided in § 437.42(a), any existing point source subject to this paragraph must achieve the following effluent limitations representing the application of BPT: BPT Limitations Regulated parameter Maximum daily 1 Maximum monthly avg. 1 Conventional Parameters BOD 5 163 53.0 O&G 205 50.2 pH ( 2 ) ( 2 ) TSS 60.0 31.0 Metal Parameters Antimony 0.249 0.206 Arsenic 0.162 0.104 Cadmium 0.474 0.0962 Chromium 15.5 3.07 Cobalt 0.192 0.124 Copper 0.865 0.757 Lead 1.32 0.283 Mercury 0.00234 0.000739 Nickel 3.95 1.45 Silver 0.120 0.0351 Tin 0.409 0.120 Titanium 0.0947 0.0618 Vanadium 0.218 0.0662 Zinc 0.497 0.420 Organic Parameters Acetone 30.2 7.97 Acetophenone 0.114 0.0562 2-Butanone 4.81 1.85 o -Cresol 1.92 0.561 p -Cresol 0.698 0.205 Phenol 3.65 1.08 Pyridine 0.370 0.182 2,4,6-Trichlorophenol 0.155 0.106 1 mg/L (ppm). 2 Within the range 6 to 9. (2) The following in-plant limitations apply to metal-bearing wastewater containing cyanide: In-Plant Limitations Regulated parameter Maximum daily 1 Maximum monthly avg. 1 Cyanide 500 178 1 mg/L (ppm). (e) Combined waste receipts from subparts B and C of this part. As provided in § 437.42(a), any existing point source subject to this paragraph must achieve the following effluent limitations representing the application of BPT: BPT Limitations Regulated parameter Maximum daily 1 Maximum monthly avg. 1 Conventional Parameters BOD 5 163 53.0 O&G 127 38.0 pH ( 2 ) ( 2 ) TSS 74.1 30.6 Metal Parameters Arsenic 2.95 1.33 Cadmium 0.0172 0.0102 Chromium 0.746 0.323 Cobalt 56.4 18.8 Copper 0.500 0.242 Lead 0.350 0.160 Mercury 0.0172 0.00647 Tin 0.335 0.165 Zinc 0.497 0.420 Organic Parameters Acetone 30.2 7.97 Acetophenone 0.114 0.0562 Bis(2-ethylhexyl) phthalate 0.215 0.101 2-Butanone 4.81 1.85 Butylbenzyl phthalate 0.188 0.0887 Carbazole 0.598 0.276 o -Cresol 1.92 0.561 p -Cresol 0.698 0.205 n-Decane 0.948 0.437 Fluoranthene 0.0537 0.0268 n-Octadecane 0.589 0.302 Phenol 3.65 1.08 Pyridine 0.370 0.182 2,4,6-Trichlorophenol 0.155 0.106 1 mg/L (ppm). 2 Within the range 6 to 9. [65 FR 81300, Dec. 22, 2000, as amended at 68 FR 71023, 71024, Dec. 22, 2003]