1. How long could a worker legally be exposed to 50 ppm of hydrogen sulfide, if she had no other exposures that day. (See PEL's)

10 seconds; 1 min; 10 min; 60 min;

2. What is the number of the regulation that controls worker exposure to beta-Propiolactone.(Hint, see PELs again. Trick question, read what you think is the right answer.)

a.)1910.1013; b.) 1910.1003; c.) 1910.1926; d.) a) and b).

3. What is the Maximum Concentration of Contaminants for the Toxicity Characteristic for Selenium (See RCRA list)

0.1 mg/L; 1.0 mg/L; 10.0 mg/L; none of these

4. The National Ambient Air Quality Standards govern the emission of beryllium, mercury, vinyl chloride, asbestos, benzene, radio nuclides, and arsenic. T/F

5. The MCLG for arsenic is 10 ppb. T/F