Sch 3Methane gas action levels

Schedule 3—Methane gas action levels

Regulation 20

| Column 1<br>Item | Column 2<br>Location for assessing methane gas concentration action levels | Column 3<br>Methane gas concentration action level | | 1 | Landfill surface final cap—measured at 50 mm above the surface | 100 parts per million | | 2 | Landfill surface final cap—measured within 50 mm of penetrations through the final cap | 100 parts per million | | 3 | Landfill surface intermediate cover areas—measured at 50 mm above the surface | 200 parts per million | | 4 | Landfill surface intermediate cover areas—measured within 50 mm of penetrations through the intermediate cover | 1000 parts per million | | 5 | Subsurface geology—perimeter monitoring bores approximately 20 m from the edge of the waste | 1% v/v above background, where v/v means the volume of methane within the total volume of gas expressed as a percentage | | 6 | Subsurface services on, and adjacent to, the waste | 10 000 parts per million | | 7 | Buildings and structures on, and adjacent to, the waste | 5000 parts per million |