HSE Environmental Regulations and Sustainability Practices 5 — Questions and Answers
Question 1: Under the Safe Drinking Water Act (SDWA), Maximum Contaminant Levels (MCLs) are set as close as feasible to MCL Goals (MCLGs) because MCLGs are:
- Legally enforceable standards
- Non-enforceable health goals set at levels with no known or anticipated adverse effects (Correct answer)
- Based on best available technology costs
- Set by state environmental agencies
Correct answer: Non-enforceable health goals set at levels with no known or anticipated adverse effects
MCLGs are non-enforceable public health goals set at levels causing no known or anticipated adverse health effects with an adequate margin of safety; MCLs are the enforceable standards set as close to MCLGs as feasible.
Question 2: Which air pollutant classification under the Clean Air Act requires facilities to use Maximum Achievable Control Technology (MACT)?
- Criteria air pollutants
- Hazardous air pollutants (HAPs) (Correct answer)
- Greenhouse gases
- Particulate matter PM2.5
Correct answer: Hazardous air pollutants (HAPs)
MACT standards apply to sources of hazardous air pollutants (HAPs) — the 187 substances listed under Clean Air Act Section 112 — based on the best-performing similar sources.
Question 3: A 'life cycle assessment' (LCA) in environmental sustainability evaluates:
- The financial return on environmental investments over a product's life
- Environmental impacts associated with all stages of a product's life from raw material extraction to disposal (Correct answer)
- Regulatory compliance over the operational life of a facility
- Worker health impacts across a product's supply chain
Correct answer: Environmental impacts associated with all stages of a product's life from raw material extraction to disposal
LCA quantifies environmental inputs and outputs (energy, materials, emissions) across all life cycle stages — extraction, manufacturing, use, and end-of-life — to identify improvement opportunities.
Question 4: Under the Endangered Species Act (ESA), a 'biological opinion' is issued by which agency during Section 7 consultation?
- EPA
- U.S. Army Corps of Engineers
- U.S. Fish and Wildlife Service or NOAA Fisheries (Correct answer)
- Bureau of Land Management
Correct answer: U.S. Fish and Wildlife Service or NOAA Fisheries
During Section 7 formal consultation, the U.S. Fish and Wildlife Service (for terrestrial/freshwater species) or NOAA Fisheries (for marine species) issues a biological opinion on whether a federal action will jeopardize listed species.
Question 5: Which of the following correctly describes the 'cap and trade' mechanism used in the EPA's Acid Rain Program?
- A technology mandate requiring all facilities to install scrubbers by a set date
- A system setting an aggregate emission cap with facilities able to buy and sell allowances to meet individual limits (Correct answer)
- A tax on sulfur dioxide emissions per ton
- A voluntary program with no compliance penalties
Correct answer: A system setting an aggregate emission cap with facilities able to buy and sell allowances to meet individual limits
Cap and trade sets a total emission ceiling (cap) and issues allowances; facilities that reduce emissions below their allocation can sell surplus allowances to facilities that need more.
Question 6: A manufacturing facility wants to demonstrate it is 'carbon neutral.' Which combination of actions would correctly support that claim?
- Measuring only Scope 1 emissions and planting trees on-site
- Measuring Scope 1, 2, and relevant Scope 3 emissions, reducing them, and offsetting remaining emissions with verified carbon credits (Correct answer)
- Switching to LED lighting and recycling scrap metal
- Purchasing renewable energy certificates (RECs) for all electricity use
Correct answer: Measuring Scope 1, 2, and relevant Scope 3 emissions, reducing them, and offsetting remaining emissions with verified carbon credits
Carbon neutrality requires measuring all relevant emission scopes, implementing reductions, and offsetting any remaining emissions with credible, verified carbon credits.
Question 7: Under RCRA, which characteristic makes a solid waste 'hazardous' based on its behavior rather than a specific chemical listing?
- Being generated in quantities greater than 1,000 kg/month
- Exhibiting ignitability, corrosivity, reactivity, or toxicity (ICRT characteristics) (Correct answer)
- Containing any listed CERCLA hazardous substance
- Being disposed in a permitted landfill
Correct answer: Exhibiting ignitability, corrosivity, reactivity, or toxicity (ICRT characteristics)
RCRA defines hazardous waste by four characteristics — ignitability, corrosivity, reactivity, and toxicity (TCLP) — in addition to listed wastes from specific processes or chemicals.
HSE Environmental Regulations and Sustainability Practices 5
Under the Safe Drinking Water Act (SDWA), Maximum Contaminant Levels (MCLs) are set as close as feasible to MCL Goals (MCLGs) because MCLGs are: