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§ 60.6680 What equations must I use?

40 CFR 60.6680

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  3. Title 40
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  5. Chapter I
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  7. Part 60
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  9. Subpart WWWW
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  11. Subject Group Model Rule—Air Curtain Incinerators That Burn 100 Percent Wood Waste, Clean Lumber, and Yard Waste
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  13. 40 CFR 60.6680
Citation40 CFR 60.6680
CorpusDaily eCFR
Displayed edition2026-05-14
Last updated2026-05-14

§ 60.6680 What equations must I use?

(a) Concentration correction to 7 percent oxygen. Correct any pollutant concentration to 7 percent oxygen using equation 1 of this section:

Equation 1 to Paragraph (a) Where: C7% = concentration corrected to 7 percent oxygen. Cunc = uncorrected pollutant concentration. CO2 = concentration of oxygen (percent).

(b) Quarterly carbon usage. If you use activated carbon to comply with the dioxins/furans or mercury limits, calculate the required quarterly usage of carbon using equation 2 of this section for facility basis or equation 3 of this section for unit basis:

(1) Plant basis.

Equation 2 to Paragraph (b)(1) Where: C = required quarterly carbon usage for the facility in kilograms (or pounds). fi = required carbon feed rate for the municipal waste combustor in kilograms (or pounds) per hour. That is the average carbon feed rate during the most recent mercury or dioxins/furans stack tests (whichever has a higher feed rate). hi = number of hours the municipal waste combustor was in operation during the calendar quarter (hours). n = number of municipal waste combustors, i, located at your plant.

(2) Unit basis.

Equation 3 to Paragraph (b)(2) Where: C = required quarterly carbon usage for the unit in kilograms (or pounds). f = required carbon feed rate for the municipal waste combustor in kilograms (or pounds) per hour. That is the average carbon feed rate during the most recent mercury or dioxins/furans stack tests (whichever has a higher feed rate). H = number of hours the municipal waste combustor was in operation during the calendar quarter (hours).

(c) Percent Reduction. If you opt to comply with the alternative percent reduction standards for hydrogen chloride, mercury or sulfur dioxide, use the following equation to calculate the percent reduction:

Equation 4 to Paragraph (c) Where: %P(HCl, Hg, SO2) = percent reduction of pollutant being measured, either hydrogen chloride, mercury or sulfur dioxide Ei = emission concentration of measured pollutant at inlet to the applicable control device, corrected to 7 percent oxygen (dry basis) Eo = emission concentration of measured pollutant at the outlet of the applicable control device, corrected to 7 percent oxygen (dry basis)