USA efficiency reference values...

The results of CAA and AP-42 or the USA show a very little trend to grow with Waste in Place, however, EPA standard formula gave no clear trend

The chart work as follows: for a given size or Waste in Place, a reference efficiency is given depending on the standard used to calculate the maximum amount of Methane produced. The standard deviation (one up and one down) is also plotted. At the bottom of each column the number of data points used to calculate the efficiency reference is displayed in white. For example, a site that has around 5 million tones of Waste in Place in the USA and using the CAA standard to calculate the maximum amount of Methane that can be produced, the reference efficiency value is 43.8%. 14 data points were employed in this calculation and the standard deviation can make the value as high as 70.8% or as low as 16.9%.