state-of-the-art
sanitary landfill, which is designed to eliminate
or minimize environmental problems
that plague older landfills. Since 1997, only
modern sanitary landfills are allowed in the
United States. As a result, many small, older
local landfills have been closed and replaced
with larger regional landfills. Question: How
do you think sanitary landfills could develop
leaks of toxic liquids?