SECTION VIII: ANSWERS TO REVIEW QUESTIONS
CHAPTER 29 PRODUCT CONTROL AND AIR
MONITORING
1. An underflow dam would be required for a fuel spill in which the fuel has a specific gravity
of less than 1.
2. An overflow dam would be required for a chemical spill in which the material has a specific
gravity of greater than 1.
3. Pipes and material to stop the flow (sand or dirt) are the two key items needed to build an
underflow or overflow dam.
4. A HAZMAT team should be consulted prior to using vapor dispersion techniques.
5. A four-gas unit that measures oxygen, lower explosive limit (LEL), carbon monoxide, and
hydrogen sulfide is the normal configuration for a multi-gas detector.
6. If a detector is calculated for methane, it will detect propane, but you need to know the
correction factor (response curve) to calculate the amount present.
7. Detectors should be calibrated per manufacturers’ recommendations.
8. The meter detects CO and H2S very well. However, with LEL and O2, the meter does a poor
job, as it takes large amounts of toxic gas to cause a change with these two sensors.
9. When responding to situations involving unknown substances, the following four detection
devices are needed: (1) pH paper, (2) an LEL sensor, (3) a photoionizaton detector (PID), and
(4) a radiation monitor.
10. Yes, NFPA 472 addresses use of detection devices at the operations level.
11. Most manufacturers recommend that detection devices be calibrated prior to use.
12. WMD detection devices take 90 seconds to indicate.
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