Method Improvements

These are some of our internal practices that improve on the quality of results for our customers. These are improvements to the methods and in any case where it could be considered a modification of the method it is done under guidance by the EPA and noted as such.

METHOD 3C/25C

Tanks cleaned and leak checked prior to being individually analyzed for cleanliness.

Sample consoles individually leak checked to extreme levels and analyzed to ensure cleanliness and that the system is ready for sampling.

Use of automated analyzers to ensure precise and consistent valve operation, which improves the ability to document and reproduce the analysis.

The calibration is checked daily against a continuing calibration curve generated using four levels of each standard.

Custom computer program uses the analyzer data to generate the report, which reduces the potential for human error in report generation.

Method 3C

  • The analysis of samples in triplicate rather than duplicate to increase the QA/QC of the report.

Method 25C

  • Nothing is reported below the lowest calibration level.
  • The results are reported on an air free basis instead of just a nitrogen free basis, which the U.S. EPA assumed would be the same. The concentration of either oxygen or nitrogen is used for the calculation based upon the comparison to the ratio of the two in ambient air. Whichever concentration would give the least adjustment is used in order to prevent any over correction bias. This is due to the requirement of a valid sample containing either <5% oxygen or <20% nitrogen and is supported by guidance from the U.S. EPA.

 

 

 

 

 

 

 

 

 

 

METHOD 25

Traps cleaned at higher temperature than that which is used for recovery and then individually analyzed at a higher temperature than that which is used for recovery to ensure cleanliness and prevent sample carryover.

Tanks cleaned and leak checked prior to being individually analyzed for cleanliness.

Sample consoles, including the probe, individually leak checked to extreme levels and analyzed to ensure cleanliness and that the system is ready for sampling.

Use of automated analyzers to ensure precise and consistent valve operation, which improves the ability to document and reproduce the analysis.

The calibration is checked daily against a continuing calibration curve generated using four levels of each standard. Nothing is reported below the lowest calibration level.

Custom computer program uses the analyzer data to generate the report, which reduces the potential for human error in report generation.

The use of larger oxidation catalysts and the complete analysis of the ICV used in the recovery of the condensible fraction from the condensate trap lessens the possibility of having unreported NMOC from the trap.