Table 421 National Emission Standards For Hazardous Air Pollutants

Affected Facility

Emission Level



Asbestos mills

Roadway surfacing



Spraying friable asbestos Equipment and machinery Buildings, structures, etc. Fabricating products

Friable insulation Waste disposal

Waste disposal sites


Extraction plants Ceramic plants Foundries Incinerators Propellant plants Machine shops (Alloy >5

percent by weight beryllium) Rocket motor test sites Closed tank collection of combustion products


Ore processing Chlor-alkali plants

Sludge dryers and incinerators

Vinyl Chloride (VC)

Ethylene dichloride (EDC) manufacturing

VC manufacturing Polyvinyl chloride (PVC) manufacturing Equipment Reactor opening loss Reactor manual vent valve

No visible emissions or meet equipment standards Contain no asbestos, except temporary use No visible emissions or meet equipment standards Wet friable asbestos or equipment standards and no visible emissions

No visible emissions or meet equipment standards < 1 percent asbestos dry weight No visible emissions or meet equipment standards No asbestos

No visible emissions or meet equipment and work practice requirements No visible emissions; design and work practice requirements

75 fig min/m3 of air within 10 to 60 minutes during two consecutive weeks 2 g/hour, maximum 10 g/day

2300 g/24 hour 2300 g/24 hour

3200 g/24 hour

1. EDC purification: 10 ppmb

2. Oxychlorination:

0.2 g/kg of EDC product 10 ppmb

10 ppmb 0.02 g/kg

No emission except emergency

No requirement No requirement No requirement No requirement

No requirement

No requirement No requirement

No requirement No requirement

No requirement

1. Source test

2. Three years CEMa

Ambient concentration during and after test

Continuous sampling during release

Source test Source test or use approved design, maintenance and housekeeping Source test or sludge test

Source test/CEMa Source test Source test/CEMa

Source test/CEMa Source test

Continued on next page

Affected Facility

Emission Level


Sources after stripper

EDC/VC/PVC manufacturing Relief valve discharge Loading/unloading

Slip gauge Equipment seals Relief valve leaks Manual venting Equipment opening

Sampling (>10 percent by weight VC) LDARd

In-process wastewater

Inorganic Arsenic

Glass melting furnace

Copper converter

Arsenic trioxide and metallic arsenic plants using roasting/ condensation process


Equipment leaks (Serving liquid or gas 10 percent by weight benzene; facilities handling 1000 Mg/ year and coke oven by-product exempt) Pumps


Pressure relief valves Sampling connection systems Open-end valves/lines

Each calendar day:

1. Strippers—2000 ppm (PVC disposal resins excluding latex); 400 ppm other

2. Others—2 g/kg (PVC disposal resins excluding latex); 0.4 g/kg other

None, except emergency 0.0038 m3 after load/unload or 10 ppm when controlled Emission to control Dual seals required Rupture disc required Emissions to control Reduce to 2.0 percent VC or

25 gallon Return to process

Approved program required 10 ppm VC before discharge

Existing: <2.5 Mg/yearc or

85 percent control New or modified: <0.4 Mg/ year or 85 percent control Secondary hooding system Particle limit 11.6 mg/dscmd

Approved operating plan

Approved plan for control of emissions

Leak is 10,000 ppm using Method 21; no detectable emissions (NDE) is 500 ppm using Method 21

Monthly LDAR,e dual seals,

95 percent control or NDEf Seal with barrier fluid, 95 percent control or NDEf NDEf or 95 percent control Closed purge or closed vent Cap, plug, or second valve

Source test

Source test

Source test

Approved program Source test

Method 108 Continuous opacity and temperature monitor for control Methods 5 and 108A Continuous opacity for control Airflow monitor for secondary hood Opacity monitor for control Ambient air monitoring

Test of NDEf Test for NDEf Test for NDEf

Continued on next page

Affected Facility

Emission Level



Pressure relief equipment Product accumulators Closed-vent systems and control devices Coke by-product plants Equipment and tanks

Light-oil sumps Napthalene equipment Equipment leaks (serving 10 percent by weight) Exhauster ( 1 percent by weight) Benzene storage vessels Vessels with capacity >10,000 gallon

Benzene transfer

Producers and terminals

(loading >1 300 000/year) Loading racks (marine rail, truck) Exemptions:

Facilities loading <70

percent benzene Facilities loading less than required of >70 percent benzene Both of above subject to record-keeping Waste Operations

Chemical manufacturing plants Petroleum refineries Coke by-product plants TSDFg treating wastes from the three preceding


DOE facilities (radon not included)

Monthly LDARe (quarterly if not leaking for two consecutive months) or NDEf LDARe

95 percent control NDE or 95 percent control

Enclose source, recover, or destroy. Carbon adsorber or incinerator alternate Cover, no venting to sump Zero emissions See 40 CFR 61, subpart J.

Quarterly LDARe or 95 percent control or NDEf

Equipped with:

1. Fixed roof with internal floating roof-seals, or

2. External floating roof with seals, or

3. Closed vent and 95 percent control

Vapor collection and 95 percent control

Load vapor-tight vessels only

1. Facilities >10 Mg/year in aqueous wastes must control streams >10 ppm. Control to 99 percent or <10 ppm

2. If >10 ppm in wastewater treatment system:

Wastes in < 10 ppm Total in <1 Mg/year

4. <1 Mg facilities

10 mrem/yearh radionuclides (any member of the public)

Test for NDEg

Monitor annually

Semiannual LDAR,e annual maintenance

Semiannual LDARe

Test for NDEf

Periodic inspection

Periodic inspection

Maintenance plant and monitoring

Annual recertification

Monitor control and treatment. Also, periodically monitor certain equipment for emissions >500 ppm and inspect equipment

Report annually One-time report

Approved EPA

computer model and Method 114 or direct monitoring (ANSIN13.1-1969)

Continued on next page

TABLE 4.2.1 Continued

Affected Facility

Emission Level


NRC licensed facilities

10 mrem/yearh radionuclides

Approved EPA

and facilities not

(any member of the public)

computer model or

covered by subpart H

Was this article helpful?

0 0

Post a comment