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 = (A2*CE2 + A3*CE3 + A4*CE4 + A5*CE5)/(A2 + A3 + A4 + A5). [89 FR 31941, Apr. 25, 2024]