Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 98, Subpt. HH, Tbl. HH-3 TABLE HH–3 TO SUBPART HH OF PART 98—LANDFILL GAS COLLECTION EFFICIENCIES

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).