GroundRules
40 CFR 421.274: Standards of performance for new sources.
Where this section sits in the code
- Title 40—Protection of Environment
- CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
- SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS
- PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY
- Subpart Y—Primary Rare Earth Metals Subcategory
Any new source subject to this subpart shall achieve the following new source performance standards:
(a) Dryer Vent Water Quench and Scrubber.
NSPS for the Primary Rare Earth Metals Subcategory
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of mischmetal produced from wet rare earth chlorides
Hexachlorobenzene 0.042 0.042
Chromium (total) 1.544 0.626
Lead 1.168 0.542
Nickel 2.295 1.544
Total suspended solids 62.600 50.080
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(b) Dryer vent caustic wet air pollution control.
NSPS for the Primary Rare Earth Metals Subcategory
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of mischmetal produced from wet rare earth chlorides
Hexachlorobenzene 0.007 0.007
Chromium (total) 0.272 0.110
Lead 0.206 0.095
Nickel 0.404 0.272
Total suspended solids 11.010 8.808
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(c) Electrolytic cell water quench and scrubber.
NSPS for the Primary Rare Earth Metals Subcategory
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of total mischmetal produced
Hexachlorobenzene 0.094 0.094
Chromium (total) 3.474 1.409
Lead 2.629 1.221
Nickel 5.165 3.474
Total suspended solids 140.900 112.700
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(d) Electrolytic cell caustic wet air pollution control.
NSPS for the Primary Rare Earth Metals Subcategory
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of total mischmetal produced
Hexachlorobenzene 0.000 0.000
Chromium (total) 0.000 0.000
Lead 0.000 0.000
Nickel 0.000 0.000
Total suspended solids 0.000 0.000
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(e) Sodium hypochlorite filter backwash.
NSPS for the Primary Rare Earth Metals Subcategory
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of total mischmetal produced
Hexachlorobenzene 0.004 0.004
Chromium (total) 0.134 0.054
Lead 0.101 0.047
Nickel 0.199 0.134
Total suspended solids 5.430 4.334
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
Collected 2026-08-27T02:26:04Z. Source file · JSON