What approach was used by EPA to address variability in the October 2005 final rule?
In assessing best performing sources’ level of performance, we quantified certain types of variability, notably analytic measurement variability that is an inherent component of performance tests, and run-to-run variability (variability in source’s performance in the multiple runs that are averaged to yield the results of a combustion performance test). We also expressed sources’ performance in terms of a parameter (a “normalizing parameter”) relating to a source’s function (either volumetric gas flow rate or, for energy recovery units, heating value of hazardous waste fuel) so that performance of sources of different size could be directly and meaningfully compared.
