Environmental
In Montana, 'chlorinated solvents' such as trichloroethylene (TCE) found in groundwater near industrial properties:
AAre harmless at low concentrations
BAre dense non-aqueous phase liquids (DNAPLs) that sink in groundwater and are difficult to remediate, posing long-term contamination risks✓ Correct
CEvaporate quickly and pose no long-term risk
DAre regulated only at concentrations above 100 ppb
Explanation
Chlorinated solvents (TCE, PCE, DCE) are DNAPLs that sink to the bottom of aquifers and can persist for decades. They are carcinogenic at very low concentrations (ppb range) and are extremely difficult and expensive to remediate.
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Key Terms to Know
Adjustable-Rate Mortgage (ARM)
A mortgage with an interest rate that changes periodically based on a financial index, usually after an initial fixed-rate period.
ZoningLocal government regulations that control land use by dividing areas into zones specifying permitted uses, building sizes, and densities.
VarianceOfficial permission to use land in a way that does not conform to the applicable zoning ordinance, granted by a zoning board when strict enforcement would cause undue hardship.
Eminent DomainThe power of government to take private property for public use, with the requirement to pay the owner just compensation.
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