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MAJESTIC TECH See the Exposure Monitoring Action table for control measures to take based on the highest measurements obstained at any one time. 10 . 2. 4 HEAT STRESS: Heat stress monitoring shall begin when ambient conditions exceed 85' F. when working in Level C. Ambient conditions shall be determined by maintaining a properly Calibrated outdoor thermometer in each location, or by monitoring local weather reports throughout each workshift . Heat stress exposure shall be evaluated by monitoring heart rate. The radial pulse shall ne taken for 30 seconds immediately upon beginning to rest ( i. e. , at the beginning of a rest break) . This rate shall be multiplied by two to determine the heart rate at intial rest. This rate should not exceed 110 beats per minute ( bpm) . Following three minutes of rest, the heart rate shall be taken again ( same procedure) . The difference between the inital and third minute heart rate should be greater than 10 bpm. If the initial rate exceeds 110 bpm OR the difference the initial and third minute rate is less than 10 bpm, then the work period shell be shortened by 33Y and the rest period incresed by 35% . The SHO shall be responsible for taking all heart rates . All heart rate monitoring shall be recorded on an Exposure Monitoring Log. Monitoring shall begin at the first rest break. The first rest break snall be taken within the first hour Of Work when ambient Conditions exceed 854F. if working in Level D and within the first 30 minutes if ambient conditions exceed 70'F. if working in Level C. 10. 2 . 5 NOISE; All field personnel shall be required to wear hearinS protective devices having a Noise Reduction Rating ( NRR) of 28 or greater in all active air operations area and when using pnuematically driven equipment ( i. e• , use of non-sparking rivet-buster to open tanks ) , As such, noise monitoring will not automatically be required. In addition, hearing protective devices shall be worn anytie, in the opinion of teh SHO, there exists a potential noise hazard. Individual operations may be checked using a Sound Level Meter, as appropriate for the operation.