Code of Federal Regulations > Title 40 > Chapter I > Part 98 > Subpart HH > Appendix - Table HH-3 to Subpart HH of Part 98

Regulations last checked for updates: Jan 30, 2025

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

Appendix - Table HH-3 to Subpart HH of Part 98—Landfill Gas Collection Efficiencies

Table HH-3 to Subpart HH of Part 98—Landfill Gas Collection Efficiencies

Description	Term ID	Landfill gas collection efficiency
A1: Area with no waste in-place	Not applicable; do not use this area in the calculation.
A2: Area without active gas collection, regardless of cover type	CE2	0%.
A3: Area with daily soil cover and active gas collection	CE3	50%.
A4: Area with an intermediate soil cover, or a final soil cover not meeting the criteria for A5 below, and active gas collection	CE4	65%.
A5: Area with a final soil cover of 3 feet or thicker of clay or final cover (as approved by the relevant agency) and/or geomembrane cover system and active gas collection	CE5	85%.
Area weighted average collection efficiency for landfills	CEave1 = (A2CE2 + A3CE3 + A4CE4 + A5CE5)/(A2 + A3 + A4 + A5).

[89 FR 31941, Apr. 25, 2024]

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

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