SWANA Landfill Gas Management 2

Question 1

Under EPA surface emissions monitoring (SEM) requirements, what surface methane concentration above background triggers corrective action?

Accepted Answer

500 ppm

Answer

100 ppm

Answer

200 ppm

Answer

1,000 ppm

Question 2

What distinguishes a passive LFG collection system from an active system?

Accepted Answer

Passive systems rely on natural pressure differentials using vents or barriers without mechanical assistance

Answer

Passive systems use blowers to draw gas

Answer

Passive systems rely on chemical neutralization of methane

Answer

Passive systems burn gas at each individual wellhead

Question 3

What is the typical combustion temperature maintained inside an enclosed ground flare to achieve high LFG destruction efficiency?

Accepted Answer

1,400–1,800°F

Answer

300–500°F

Answer

600–800°F

Answer

2,500–3,000°F

Question 4

What does RNG stand for in the context of advanced LFG utilization projects?

Accepted Answer

Renewable Natural Gas

Answer

Refined Non-fossil Gas

Answer

Regulated Nitrogen Gas

Answer

Recovered Natural Gas

Question 5

What pipe material is most commonly used in the construction of vertical LFG extraction wells?

Accepted Answer

High-density polyethylene (HDPE) pipe

Answer

Copper tubing

Answer

Cast iron pipe

Answer

Schedule 40 PVC pressure pipe

Question 6

Which instrument is most commonly used to directly measure gas flow rate at LFG wellheads or in collection headers?

Accepted Answer

Orifice plate or thermal mass flowmeter

Answer

Thermocouple probe

Answer

pH electrode

Answer

Pitot tube manometer

Question 7

EPA's NSPS for MSW landfills (40 CFR Part 60, Subpart XXX) requires GCCS to reduce NMOC emissions to what minimum destruction efficiency?

Accepted Answer

98%

Answer

75%

Answer

85%

Answer

90%