Document ID: chunk:federal_register_of_legislation:F2024C00833:reg:10:p6
Version: federal_register_of_legislation:F2024C00833
Segment Type: reg
Provision Reference: reg 10 (pt 6/15)
Character Range: 687952–690729

only waste mix of the type mentioned in paragraph 5.11(1)(i)—is unlimited; and
 (b) for all other sub‑facility zones—must not exceed 4.
 (3) A sub‑facility zone:
 (a) must cover an area of at least 1 hectare; and
 (b) must be a single area within the landfill; and
 (c) must have a uniform composition of waste mix types so that the estimates of the methane generated by the sub‑facility zone are in accordance with section 1.13; and
 (d) must not be subject to:
 (i) landfill gas inflow from another sub‑facility zone; or
 (ii) landfill gas outflow to another sub‑facility zone.
 (4) At least one sub‑facility zone must contain a representative zone.
Note: Section 5.22A sets out, for a landfill operator using method 1 in Division 5.2.2 to estimate emissions of methane released from legacy waste in a landfill, options and requirements related to sub‑facility zones.

5.17A  Representative zones—selection and requirements
  After preparing a site plan, the operator of the landfill must select a representative zone that:
 (a) covers an area of at least one hectare; and
 (b) is a single area within the sub‑facility zone; and
 (c) has a uniform composition of waste mix types so that the estimates of the methane generated by the representative zone comply with section 1.13; and
 (d) contains a number of operating gas collection wells that is sufficient to enable accurate and representative estimates of the methane being generated by the representative zone to be obtained; and
 (e) contains only waste that has been undisturbed:
 (i) for at least 12 months before any methane generation is measured in accordance with section 5.17H; or
 (ii) if the representative zone is on landfill that recirculates leachate or adds moisture through the waste to promote methane generation—for the period determined by an independent expert; and
 (f) has a low permeability basal liner that includes:
 (i) a compacted clay base; or
 (ii) a geomembrane base; or
 (iii) another demonstrated low permeability base; and
 (g) is confined on:
 (i) 4 sides by low permeability barriers, including:
 (A) capped areas; or
 (B) a landfill cell lining; or
 (C) if the representative zone does not have a landfill cell lining—a demonstrated low gas permeability strata; or
 (ii) 3 sides by low permeability barrier and one side by an active gas collection system; and
 (i) includes a gas extraction system that:
 (i) forms the boundary of the fourth side; and
 (ii) extends beyond the boundary of the representative zone; and
 (j) has a top cover that is a final type or an intermediate type.

5.17B  Independent verification
 (1) After the operator of the landfill has selected a representative zone for a sub‑facility zone, the operator of the landfill must arrange for an independent expert