40 CFR 421.252 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

View all text of Subpart W [§ 421.250 - § 421.257]

§ 421.252 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable technology currently available:

(a) Smelter wet air pollution control.

BPT Limitations for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		mg/troy ounce of gold and silver smelted		Lead	0.546	0.260	Mercury	0.325	0.130	Silver	0.533	0.221	Zinc	1.898	0.793	Gold	0.130		Oil and grease	26.000	15.600	Total suspended solids	53.300	25.350	pH	( 1)	( 1)

1 Within the range of 7.5 to 10.0 at all times.

(b) Silver chloride reduction spent solution.

BPT Limitations for the Primary Precious Metals and Mercury Subcategory

Pollutant of pollutant property	Maximum for any 1 day	Maximum for monthly average		mg/troy ounce of silver reduced in solution		Lead	0.168	0.080	Mercury	0.100	0.040	Silver	0.164	0.068	Zinc	0.584	0.244	Gold	0.040		Oil and grease	8.000	4.800	Total suspended solids	16.400	7.800	pH	( 1)	( 1)

1 Within the range of 7.5 to 10.0 at all times.

(c) Electrolytic cells wet air pollution control.

BPT Limitations for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		mg/troy ounce of gold refined electrolytically		Lead	83.160	39.600	Mercury	49.500	19.800	Silver	81.180	33.660	Zinc	289.100	120.800	Gold	19.800		Oil and grease	3,960.000	2,376.000	Total suspended solids	8,118.000	3,861.000	pH	( 1)	( 1)

1 Within the range of 7.5 to 10.0 at all times.

(d) Electrolyte preparation wet air pollution control.

BPT Limitations for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		mg/troy ounce of silver in electrolyte produced		Lead	0.021	0.010	Mercury	0.013	0.005	Silver	0.021	0.009	Zinc	0.073	0.031	Gold	0.005		Oil and Grease	1.000	0.600	Total suspended solids	2.050	0.975	pH	( 1)	( 1)

1 Within the range of 7.5 to 10.0 at all times.

(e) Calciner wet air pollution control.

BPT Limitations for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		mg/kg (pounds per million pounds) of mercury condensed		Lead	78.200	37.240	Mercury	46.550	18.620	Silver	76.340	31.650	Zinc	271.900	113.600	Gold	18.600		Oil and Grease	3,724.000	2,234.000	Total suspended solids	7,634.000	3,631.000	pH	( 1)	( 1)

1 Within the range of 7.5 to 10.0 at all times.

(f) Calcine quench water.

BPT Limitations for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		mg/kg (pounds per million pounds) of mercury condensed		Lead	7.392	3.520	Mercury	4.400	1.760	Silver	7.216	2.992	Zinc	25.700	10.740	Gold	1.760		Oil and Grease	352.000	211.200	Total suspended solids	721.600	343.200	pH	( 1)	( 1)

1 Within the range of 7.5 to 10.0 at all times.

(g) Calciner stack gas contact cooling water.

BPT Limitations for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		mg/kg (pounds per million pounds) of mercury condensed		Lead	1.743	0.830	Mercury	1.038	0.415	Silver	1.702	0.706	Zinc	6.059	2.532	Gold	0.415		Oil and Grease	83.000	49.800	Total suspended solids	170.200	80.930	pH	( 1)	( 1)

1 Within the range of 7.5 to 10.0 at all times.

(h) Condenser blowdown.

BPT Limitations for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		mg/kg (pounds per million pounds) of mercury condensed		Lead	5.796	2.760	Mercury	3.450	1.380	Silver	5.658	2.346	Zinc	20.150	8.418	Gold	1.380		Oil and Grease	276.000	165.600	Total suspended solids	565.800	269.100	pH	( 1)	( 1)

1 Within the range of 7.5 to 10.0 at all times.

(i) Mercury cleaning bath water.

BPT Limitations for the Primary Precious Metals and Mercury Subcategory

Pollutant or pollutant property	Maximum for any 1 day	Maximum for monthly average		mg/kg (pounds per million pounds) of mercury condensed		Lead	0.588	0.280	Mercury	0.350	0.140	Silver	0.574	0.238	Zinc	2.044	0.854	Gold	0.140		Oil and Grease	28.000	16.800	Total suspended solids	57.400	27.300	pH	( 1)	( 1)

1 Within the range of 7.5 to 10.0 at all times.

AUTHORITY: Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311, 1314 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4.

SOURCE: 49 FR 8790, Mar. 8, 1984, unless otherwise noted.

CITE AS: 40 CFR 421.252