Intermediate Test Method Change

{
  "id": "MLC-T-ENV-014729",
  "term": "Intermediate Test Method Change",
  "field": "Environment",
  "definition": "Within-method modification to a federally enforceable test method involving “proven technology” (generally accepted by the scientific community as equivalent or better) that is applied on a site-specific basis and that may have the potential to decrease the stringency of the associated emission limitation or standard. Though site-specific, an intermediate change may set a national precedent for a source category and may ultimately result in a revision to the federally enforceable test method. In order to be approved, an intermediate change must be validated according to EPA Method 301 (40 CFR part 63, appendix A) to demonstrate that it provides equal or improved accuracy or precision. Examples of intermediate changes to a test method include, but are not limited to:(1) Modifications to a test method's sampling procedure including substitution of sampling equipment that has been demonstrated for a particular sample matrix; and use of a different impinger absorbing solution;(2) Changes in sample recovery procedures and analytical techniques, such as changes to sample holding times and use of a different analytical finish with proven capability for the analyte of interest; and(3) “Combining” a federally required method with another proven method for application to processes emitting multiple pollutants.",
  "references": [
    "40 CFR 65.2 (CFR 2013)"
  ],
  "url": "https://mlchart.com/terminology/environment/intermediate-test-method-change/"
}