2015 First Aid Exam No. 4 Taken from the 2015 Missouri S&T First Aid Contest held in Rolla, Missouri Progress Indicator: Question 7 of 30 7.  At what level of SCBA reserve should the responders begin to exit the scene to allow enough time for exiting and decontamination? p. 568 Choices: 25% 10% 15% 20%