Northeastern: check to see if their civil engineering department has sufficient coursework in environmental engineering subjects -- at some schools, environmental engineering is a subarea of civil engineering.
Vermont: check how co-op jobs are handled there -- many engineering students at not-specifically-co-op-schools do co-op jobs anyway.
The difference of $30,000 per year = $120,000 total. That is likely to be an overriding difference for many people. Will your parents who are pushing Northeastern be able and willing to cover the difference, or will you have to take substantially greater amounts of student loan debt at Northeastern? Some recommend not taking more total student loan debt than the first year pay of a new graduate in your major; others suggest a more conservative limit of half of the first year pay of a new graduate in your major or the subsidized Stafford loan limit (currently $23,000), whichever is less.