Environmental

A Colorado homeowner discovers naturally occurring uranium in the soil of their property in a mountain area. The primary concern is:

AA. Uranium always contaminates ground water at dangerous levels
BB. Natural uranium decay can produce radon gas, which may accumulate in the home and poses lung cancer risk✓ Correct
CC. Uranium soil contamination must be reported to the EPA immediately
DD. Only properties built before 1960 can have uranium contamination

Explanation

Colorado has significant uranium deposits, particularly in mountain regions. As uranium naturally decays, it produces radon gas, which can seep into buildings.

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