1. a colorless oily fuming liquid, N2H4, used as a reducing agent and a jet-propulsion fuel. 2. a class of substances derived from this substance by replacing one or more hydrogen atoms by an organic group.
More than 150 companies and government entities could be asked to cover their share of the cleanup costs. On Nov. 18, the EPA submitted a nearly $1.4 billion cleanup option for the Portland Harbor Superfund site to the National Remedy Review Board, which serves as a peer review panel for Superfund projects.
Typical Gutter Cleaning Costs. 1  Single-story home: A typical 1,500-square-foot home can cost $65-$225 to clean the gutters.  Two-story home: A 2,500-square-foot home with about 200 linear feet of gutters will cost $100-$300 to clean.