CHEMISTRY OFHAZARDOUS MATERIALS

TOTAL OF 8 QUESTIONS. 2 ARE DISCUSSION QUESTIONS. 6 MULTIPLE CHOICE. SEE ATTACHMENT.

1.    A contractor was hired to do some maintenance work inside a grain silo. Assuming the facility is at sea level, what is the minimum level of oxygen necessary for the contractor to carry out his or her task without using a supplied air respirator?

 A soil vapor extraction system equipped with carbon canisters is used to remediate gasoline contamination at a gas station. Which of the following statement is TRUE?