The primary sample USSCL-PT10-S-20221206 (tube C16112) and its corresponding duplicate USSCL-PT10-D-20221206 (tube B18509) failed to meet the 30% difference criterion for toluene as outlined in EPA Method 325B. The lab could not determine a cause for the difference. The toluene results for all samples in the data set have been flagged “P” to denote this failure. The collocated pairs met the 30% difference criterion for all other target compounds. EPA Method 325B states that a CCV is to be run after every tenth sample. Eleven samples were inadvertently injected between two CCVs. This oversight, while a deviation from Method QC criteria, has no impact on data quality.