What do the terms ‘RL’ and ‘MRL’ on your report mean?
RL refers to the initial “Reporting Limit”. This is the lowest quantifiable reporting limit that can be achieved when an analysis is performed under ordinary conditions.
MRL refers to “Modified Reporting Limit” and is the final reporting limit that applies to the sample once all sample preparation factors and/or dilution factor have be applied. For example, if Chromium in soil was reported at a dilution factor of 10 the RL column would read ‘5’ but the MRL column would read ‘50’. Or, for example, if an oil and grease sample was analyzed with only 500 mL rather than 1000 mL, a preparation factor of 2 would be necessary and the RL column would read ‘5’ while the MRL column would read ‘10’.