40 CFR Appendix Table 4 to Subpart BBBB of Part 60 - Table 4 to Subpart BBBB of Part 60—Model Rule—Class II Emission Limits for Existing Small Municipal Waste Combustion Unit a

For the following pollutants	You must meet the following emission following determine limits b	Using the following averaging times	And determine compliance by the following methods
1. Organics:
Dioxins/Furans (total mass basis)	125 nanorgrams per dry standard cubic meter	3-run average (minimum run duration is 4 hours)	Stack test.
2. Metals:
Cadmium	0.10 milligrams per dry standard cubic meter	3-run average (run duration specified in test method)	Stack test.
Lead	1.6 milligrams per dry standard cubic meter	3-run average (run duration specified in test method)	Stack test.
Mercury	0.080 milligrams per dry standard cubic meter	3-run average (run duration specified in test method)	Stack test.
	85 percent reduction of potential mercury emissions
Opacity	10 percent	Thirty 6-minute average	Stack test.
Particulate Matter	70 milligrams per dry standard cubic meter	3-run average (run duration specified in test method)	Stack test.
3. Acid Gases:
Hydrogen Chloride	250 parts per million by volume -or-	3-run average (minimum run duration is 1 hour)	Stack test.
	50 percent reduction of potential hydrogen chloride emissions
Sulfur Dioxide	77 parts per million by dry volume -or- 50 percent reduction of potential sulfur dioxides emissions	24-hour daily block geometric average concentration -or- percent reduction	Continuous emission monitoring system.
4. Other:
Fugitive Ash	Visible emissions for no more than 5 percent of hourly observation period	Three 1-hour observation periods	Visible emission test.

a Class II units mean all small municipal combustion units subject to this subpart that are located at municipal waste combustion plants with aggregate plant combustion capacity less than or equal to 250 tons per day of municipal solid waste. See § 60.1940 for definitions.

b All emission limits (except for opacity) are measured at 7 percent oxygen.

c No monitoring, testing, recordkeeping or reporting is required to demonstrate compliance with the nitrogen oxides limit for Class II units.