Code of Federal Regulations > Title 40 > Chapter I > Part 98 > Subpart HH > Appendix - Table HH-1 to Subpart HH of Part 98—Emissions Factors, Oxidation Factors and Methods

Regulations last checked for updates: Jan 30, 2025

Title 40 - Protection of Environment last revised: Nov 08, 2025

Appendix - Table HH-1 to Subpart HH of Part 98—Emissions Factors, Oxidation Factors and Methods

Table HH-1 to Subpart HH of Part 98—Emissions Factors, Oxidation Factors and Methods

Factor	Default value	Units
DOC and k values—Bulk waste option:
DOC (bulk waste) for disposal years prior to 2010	0.20	Weight fraction, wet basis.
DOC (bulk waste) for disposal years 2010 and later	0.17	Weight fraction, wet basis.
k (precipitation plus recirculated leachate ^a <20 inches/year) for disposal years prior to 2010	0.02	yr- ¹.
k (precipitation plus recirculated leachate ^a <20 inches/year) for disposal years 2010 and later	0.033	yr- ¹.
k (precipitation plus recirculated leachate ^a 20-40 inches/year) for disposal years prior to 2010	0.038	yr- ¹.
k (precipitation plus recirculated leachate ^a 20-40 inches/year) for disposal years 2010 and later	0.067	yr- ¹.
k (precipitation plus recirculated leachate ^a >40 inches/year) for disposal years prior to 2010	0.057	yr- ¹.
k (precipitation plus recirculated leachate ^a >40 inches/year) for disposal years 2010 and later	0.098	yr- ¹.
DOC and k values—Modified bulk MSW option:
DOC (bulk MSW, excluding inerts and C&D waste) for disposal years prior to 2010	0.31	Weight fraction, wet basis.
DOC (bulk MSW, excluding inerts and C&D waste) for disposal years 2010 and later	0.27	Weight fraction, wet basis.
DOC (inerts, e.g., glass, plastics, metal, concrete)	0.00	Weight fraction, wet basis.
DOC (C&D waste)	0.08	Weight fraction, wet basis.
k (bulk MSW, excluding inerts and C&D waste) for disposal years prior to 2010	0.02 to 0.057 ^b	yr- ¹.
k (bulk MSW, excluding inerts and C&D waste) for disposal years 2010 and later	0.033 to 0.098 ^b	yr- ¹.
k (inerts, e.g., glass, plastics, metal, concrete)	0.00	yr- ¹.
k (C&D waste)	0.02 to 0.04 ^b	yr- ¹.
DOC and k values—Waste composition option:
DOC (food waste)	0.15	Weight fraction, wet basis.
DOC (garden)	0.2	Weight fraction, wet basis.
DOC (paper)	0.4	Weight fraction, wet basis.
DOC (wood and straw)	0.43	Weight fraction, wet basis.
DOC (textiles)	0.24	Weight fraction, wet basis.
DOC (diapers)	0.24	Weight fraction, wet basis.
DOC (sewage sludge)	0.05	Weight fraction, wet basis.
DOC (inerts, e.g., glass, plastics, metal, cement)	0.00	Weight fraction, wet basis.
DOC (Uncharacterized MSW	0.32	Weight fraction, wet basis.
k (food waste)	0.06 to 0.185 ^c	yr- ¹.
k (garden)	0.05 to 0.10 ^c	yr- ¹.
k (paper)	0.04 to 0.06 ^c	yr- ¹.
k (wood and straw)	0.02 to 0.03 ^c	yr- ¹.
k (textiles)	0.04 to 0.06 ^c	yr- ¹.
k (diapers)	0.05 to 0.10 ^c	yr- ¹.
k (sewage sludge)	0.06 to 0.185 ^c	yr- ¹.
k (inerts, e.g., glass, plastics, metal, concrete)	0.00	yr- ¹.
k (uncharacterized MSW)	0.033 to 0.098 ^b	yr- ¹.
Other parameters—All MSW landfills:
MCF	1
DOCF	0.5
F	0.5
OX	See table HH-4 to this subpart
DE	0.99

^a Recirculated leachate (in inches/year) is the total volume of leachate recirculated from company records or engineering estimates divided by the area of the portion of the landfill containing waste with appropriate unit conversions. Alternatively, landfills that use leachate recirculation can elect to use the k value of 0.098 rather than calculating the recirculated leachate rate.

^b Use the lesser value when precipitation plus recirculated leachate is less than 20 inches/year. Use the greater value when precipitation plus recirculated leachate is greater than 40 inches/year. Use the average of the range of values when precipitation plus recirculated leachate is 20 to 40 inches/year (inclusive). Alternatively, landfills that use leachate recirculation can elect to use the greater value rather than calculating the recirculated leachate rate.

^c Use the lesser value when the potential evapotranspiration rate exceeds the mean annual precipitation rate plus recirculated leachate. Use the greater value when the potential evapotranspiration rate does not exceed the mean annual precipitation rate plus recirculated leachate. Alternatively, landfills that use leachate recirculation can elect to use the greater value rather than assessing the potential evapotranspiration rate or recirculated leachate rate.

[89 FR 31940, Apr. 25, 2024]

authority: 42 U.S.C. 7401-7671q.

source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.