Document ID: chunk:federal_register_of_legislation:F2024C00833:reg:10:p11
Version: federal_register_of_legislation:F2024C00833
Segment Type: reg
Provision Reference: reg 10 (pt 11/15)
Character Range: 700648–703417

flow rate obtained in accordance with subsection (3) by:

where:
OF is the oxidation factor mentioned in subsection 5.15(1).
 (5) The measurement of methane obtained under the formula in subsection (2) must be converted from milligrams of methane per square metre per second to tonnes of methane for the surface area of the representative zone for the reporting year.
 (6) Estimates of gas flow must be converted from cubic metres to mass by using the formula in subsection 1.21(1).

5.17I  When flux box measurements must be taken
 (1) Flux box measurements must be taken during the normal operating times of the gas collection wells in the representative zone.
 (2) The measurements must be completed within 3 days.

5.17J  Restrictions on taking flux box measurements
 (1) Flux box measurements must not be taken:
 (a) within 2 days of heavy rainfall over the representative area; or
 (b) if barometric pressure at the landfill site is rising or falling sharply; or
 (c) during frost conditions; or
 (d) in any other meteorological conditions that may significantly affect the accuracy of the measurements; or
 (e) in areas where there is standing water.
Note: AS/NZS 4323.4—2009 and the publication entitled Guidance on monitoring landfill gas surface emissions published by the Environment Agency of the United Kingdom in September 2004 contain guidance on good measurement practice.
 (2) For subsection (1), there is heavy rainfall over a representative area on any day of a month if the amount of rain that is recorded:
 (a) at the landfill on that day; or
 (b) if rainfall is not recorded at the landfill—at the nearest Bureau of Meteorology weather station to the landfill on that day;
exceeds the heavy rainfall benchmark, as calculated in accordance with the following formula:

where:
HRF is the heavy rainfall benchmark.
RF is the mean monthly rainfall for the month at the landfill or nearest Bureau of Meteorology weather station.
MRD is the mean rainfall days for the month at the nearest Bureau of Meteorology weather station as recorded in the publication published by the Bureau of Meteorology and known as Climate statistics for Australian locations.

5.17K  Frequency of measurement
  The measurement of emissions by flux boxes must be undertaken on a quarterly basis for a period of at least 12 months.

5.17L  Calculating the methane generation constant (ki) for certain waste mix types
 (1) In this section:
ki means the methane generation constant for each waste mix type:
 (a) mentioned in column 3 of the table in subsection 5.14(6); and
 (b) worked out by performing the steps set out in subsection (2).
Qz means the gas flow rate for the representative zone.
CH4gen is the quantity of methane generated by the landfill as calculated under