Technician Team Test No. 1 Taken from the 2016 Central Mine Rescue Technician Team Contest (Drager BG4) held in Kellogg, ID Progress Indicator: Question 2 of 29 2.  When sampling using a CPDM, the person certified in sampling must monitor the dust concentrations and the sampling status conditions being reported by the sampling device ______ or more frequently as specified in the approved mine ventilation plan. Choices: at the end of the cut between the 1st and 2nd hour of the shift at mid-shift during the last hour of the shift