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	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: 60%.
A4: Area with an intermediate soil cover, or a final soil cover not meeting the criteria for A5 below, and active gas collection	CE4: 75%.
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: 95%.
Weighted average collection efficiency for landfills:
Area weighted average collection efficiency for landfills	CEave1 = (A2*CE2 + A3*CE3 + A4*CE4 + A5*CE5) / (A2 + A3 + A4 + A5).

[74 FR 56374, Oct. 30, 2009, as amended at 75 FR 66474, Oct. 28, 2010; 81 FR 89266, Dec. 9, 2016]