please i need a correct steps and solution. please not guessing the answer. Than

Question

please i need a correct steps and solution. please not guessing the answer. Thank You

A substance has a TLV-TWA of 200 ppm, a TLV-STEL of 250 ppm and a TLV-C of 300 ppm. The data in the following table were taken in a work area 1. Concentration ( Time 8:01 am 9:17 am 10:05 am 11:22 am 12:08 pm 1:06 pm 2:05 pm 3:09 pm 4:00 pm 5:05 pm 185 240 270 230 190 150 170 165 160 130 A worker on an 8-hour shift is exposed to this toxic vapor. Is the exposure within compliance? If not, what are the violations and what controls should be put in place? Assume that the worker is at lunch between the hours of 12 noon to 1 pm and is not exposed to the chemical during that time

Explanation / Answer

Therefore, TLV-TWA = 1567.6/8 = 195.95 < 200 ppm. This value is within limit

TLV-STEL exceeded 250 ppm in between 9.00-11.00 pm. Therefore workplace is not in compliance

TLV-C value never exceeded 300 ppm during the work time

Time ppm Exposed min Exposed hour C C X t 8 185 8.01 185 1 0.0167 185 3.1 9.17 240 76 1.2667 212.5 269.2 10.05 270 48 0.8 255 204 11.22 230 77 1.2833 250 320.8 12 197 38 0.6333 213.5 135.2 12.08 190 1 154 1.06 150 6 0.1 152 15.2 2.05 170 59 0.9833 160 157.3 3.09 165 64 1.0667 167.5 178.7 4 160 51 0.85 162.5 138.1 5 132 60 1 146 146 sum =1567.6

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