MST Safety & Environmental Regulations 2

Question 1

Under the Clean Water Act, what is the maximum allowable oil content in bilge water discharged overboard from a recreational vessel?

Accepted Answer

10 ppm

Answer

The Clean Water Act and EPA regulations limit overboard discharge of bilge water to no more than 10 parts per million (ppm) of oil.

Question 2

Which agency administers the Oil Pollution Act (OPA 90) for vessels operating in US waters?

Accepted Answer

USCG and EPA jointly

Answer

OPA 90 is jointly administered by the US Coast Guard (for vessel compliance) and the EPA (for facilities and response planning).

Question 3

A marine technician notices a customer's vessel has no placard stating 'Discharge of Oil Prohibited.' What is required?

Accepted Answer

Post a 5×8 inch placard in the machinery space

Answer

Federal law (33 CFR 151.65) requires vessels 26 feet and longer to post a 5×8 inch 'Discharge of Oil Prohibited' placard in the machinery space.

Question 4

When working in a confined space aboard a vessel, what atmosphere condition is considered immediately dangerous to life or health (IDLH) for oxygen?

Accepted Answer

Below 19.5% or above 23.5% oxygen

Answer

OSHA defines an IDLH atmosphere for oxygen as below 19.5% (oxygen deficient) or above 23.5% (oxygen enriched), both of which are hazardous.

Question 5

Which type of fire extinguisher is most appropriate for an engine compartment fire involving fuel and electrical components?

Accepted Answer

Type B:C dry chemical or CO2

Answer

B:C rated dry chemical or CO2 extinguishers are approved for flammable liquid (B) and electrical (C) fires common in engine compartments.

(MST) Marine Service Technician Practice Test