Thanks to EPA we have the Twelve Essential QC Practices of Christmas...

Based on EPA’s Twelve Essential QC Activities as found in the Sept 23, 2010 Method Update Rule:

On the Nth day of testing the lab gave to me:

One Demonstration of Capability

   Two Limits of Detection

      Three Method Blanks

         Four QC Standards

            Five C-C-V’s

Six Matrix Spikes (and MSD’S)

   Seven Internal Standards (if you need them)

      Eight More Control Charts

         Nine Acceptance Criteria

            Ten Corrective Actions

               Eleven Batch definitions

                  Twelve QC Frequencies