Dataset: Chemistry QA Code Lookup Table File Name: va93_5_7.txt Date Created: 09/14/96 # Variables: 2 # Header Records: 12 # Data Records: 5 Variables: CODE Chemistry QA Code DESCR Resolution of QA Code CODE DESCR CH-A The Analyte was not detected. The detection limit is reported as a separate variable. CH-B The reported concentration is below or equal to the detection limit. The detection limit is reported as a separate variable. CH-C The reported concentration is considered an estimate because control limits for this analyte were exceeded in one or more quality control samples. CH-D In GC_ECD dual column confirmation, results from the primary and secondary columns differed by more than a factor of 3. The lower of the two is reported.