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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