Regulations last checked for updates: May 19, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
§ 421.244 - Standards of performance for new sources.

Any new source subject to this subpart shall achieve the following new source performance standards:

(a) Slag reclaim tailings.

NSPS for the Secondary Nickel Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of slag input to reclaim process
Chromium (total)5.6532.313
Copper24.41012.850
Nickel24.67016.320
Total suspended solids526.800250.500
pH( 1)( 1)

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

(b) Acid reclaim leaching filtrate.

NSPS for the Secondary Nickel Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of acid reclaim nickel produced
Chromium (total)2.1980.899
Copper9.4914.995
Nickel9.5906.344
Total suspended solids204.80097.400
pH( 1)( 1)

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

(c) Acid reclaim leaching belt filter backwash.

NSPS for the Secondary Nickel Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of acid reclaim nickel produced
Chromium (total)0.5280.216
Copper2.2781.199
Nickel2.3021.523
Total suspended solids49.16023.380
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,c,e,and, 1316 (b) andc, 1317 (b) andc,1318; 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 421.244