Asbestos in Construction practice questions for the CHST exam

During a Class I removal job, an air monitoring technician reviews a 30-minute sample collected in a worker's breathing zone. The result is 0.6 f/cc. The employer's 8-hour TWA results for the same worker have all been below 0.1 f/cc. Based on the asbestos construction standard, what is the correct conclusion about this result?

1. A.It complies, because the 30-minute result is below the excursion limit of 1.0 f/cc
2. B.It cannot be evaluated, because the excursion limit applies only to 8-hour samples
3. C.It violates the standard, because the excursion limit is 0.5 f/cc over 15 minutes
4. D.It violates the standard, because any 30-minute result above 0.1 f/cc exceeds the limit

A crew is removing asbestos-containing floor tile and mastic (Class II work). No negative exposure assessment is available, so the employer issued elastomeric half-mask respirators with HEPA cartridges. One worker asks to use a tight-fitting powered air-purifying respirator (PAPR) with HEPA filters instead. The exposure conditions are such that the PAPR would give adequate protection. What must the employer do?

1. A.Refuse the request, because the half-mask already meets the minimum respirator requirement for this work
2. B.Offer a disposable filtering facepiece respirator as a compromise, since it is lighter than the half-mask
3. C.Provide the PAPR only if the worker supplies it, since the employer has already met its obligation with the half-mask
4. D.Provide the tight-fitting PAPR, because the worker chose it and it gives adequate protection

A contractor is removing asbestos-containing material using a containment box. The box was smoke-tested yesterday at another location, and no leaks were found. The crew now plans to reuse the same box today at a new location, and the foreman proposes skipping the smoke test because the box passed and was not damaged in transport. What does the standard require?

1. A.Replace the smoke test with a HEPA filtration system running during removal
2. B.Smoke-test the box again and seal any leaks before this use, even though it passed yesterday
3. C.Skip the test, because a passing result carries over to later uses unless the box is visibly damaged
4. D.Smoke-test the box only at the start of each work week