Question

which of the following disposal methods has the highest risk of contaminating groundwater if not properly managed? high - temperature incineration open surface impoundments phytoremediation by plants perpetual storage in arid regions

Explanation:

Open surface impoundments are basins or ponds that hold liquid waste. If not properly managed, contaminants can seep through the soil into groundwater. High - temperature incineration mainly releases pollutants into the air. Phytoremediation by plants is a method to clean up pollutants. Perpetual storage in arid regions (if well - engineered) has less risk of groundwater contamination compared to open surface impoundments as arid soils may have lower permeability and less water to carry contaminants.

Answer:

open surface impoundments