CPWM Landfill Gas Management and Energy Recovery 2

Question 1

What is the primary regulatory purpose of a gas collection and control system (GCCS) at a municipal solid waste landfill?

Accepted Answer

To capture and control LFG emissions to meet Clean Air Act requirements

Answer

To prevent rainwater infiltration into the waste mass

Answer

To accelerate the rate of waste decomposition

Answer

To monitor groundwater quality beneath the landfill

Question 2

Under 40 CFR Part 60 Subpart Cf, at what non-methane organic compound (NMOC) emission rate must a landfill install a gas collection and control system?

Accepted Answer

34 megagrams per year

Answer

10 megagrams per year

Answer

25 megagrams per year

Answer

50 megagrams per year

Question 3

Which of the following best describes 'renewable natural gas' (RNG) produced from a landfill?

Accepted Answer

LFG purified to pipeline-quality methane content for injection into the natural gas grid

Answer

Natural gas piped to the landfill to power heavy equipment

Answer

Compressed natural gas produced on-site to fuel collection vehicles directly

Answer

Biogas generated from an on-site composting operation adjacent to the landfill

Question 4

Which EPA tool is the standard model used for estimating landfill gas generation rates and total emissions from MSW landfills?

Accepted Answer

LandGEM (Landfill Gas Emissions Model)

Answer

HELP Model (Hydrologic Evaluation of Landfill Performance)

Answer

MODFLOW groundwater flow model

Answer

SWMM (Storm Water Management Model)

Question 5

What minimum destruction or removal efficiency must an enclosed combustion device achieve for NMOCs under EPA regulations for MSW landfill gas?

Accepted Answer

98% destruction efficiency

Answer

85% destruction efficiency

Answer

95% destruction efficiency

Answer

99.9% destruction efficiency

Question 6

What term describes the subsurface horizontal movement of landfill gas through soil into adjacent properties or structures?

Accepted Answer

LFG lateral migration

Answer

LFG percolation

Answer

LFG volatilization

Answer

LFG efflorescence

Question 7

Which of the following is NOT a common beneficial use pathway for landfill gas energy recovery?

Accepted Answer

Direct use as aviation jet fuel for commercial aircraft

Answer

Electricity generation via internal combustion engines or turbines

Answer

Direct use as boiler fuel for industrial or institutional heating

Answer

Upgrading to pipeline-quality RNG for injection into the gas grid