Let us now consider a new scenario of a custodian who works at the school. Calcu

Question

Let us now consider a new scenario of a custodian who works at the school. Calculate their risk of asbestos exposure. Use the risk level of 1 death @ 0.0004 f/ml per lifetime exposure (i.e. 24/7 for 70 years) then work your way from there.

Use this data: average asbestos levels in maintenance areas of k-12 school buildings was reported to be 0.01 fibers per ml

Worker exposure: 8 hrs/day for 250 days per year for 30 years (average employment period for school maintenance workers.

(show all work and calculations).

Explanation / Answer

1 death @ 0.0004 f/ml per lifetime exposure (i.e. 24/7 for 70 years)

We have 0.01 f/ml concentration and the exposure is 8 hrs/day for 250 days per year for 30 years.

1 death @ 0.0004 f/ml for 24*365*70 hrs (i.e. 613200 hrs)

We can say that 1 death per 0.0004*613200 f.hr/ml, i.e. 245.28 f.hr/ml.

The exposure that the workers currently have is 0.01*8*250*30 f.hr/ml = 600 f.hr/ml

So the calculated risk = 600/245.28 = 2.446 deaths.

The risk of asbestos exposure is 2.44 ( approx 2 deaths)

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