| http://www.w3.org/ns/prov#value | - Potential dangers include: carcinogenic radon, radium-226, and radium-228;4 salt from road-salting stockpiles or saline aquifers; pesticides; fertilizers; explosive methane; MTBE (a gasoline additive); fuel from leaking underground tanks; bacteria-laden waste from leaking septic tanks, broken sewer lines, pets, farm animals, or wildlife; and chemical or other hazardous waste.
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