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.
1 Gravel-for the pouring of crushed stone the costs would be an average of $1.40 per square foot at a 1 depth, or a total of $420 for a delivery of stones adequate for a single 1 of coverage. Complete site clearing costs between $150 to $400 per hour depending upon the machinery necessary for the job (usually including a large bull dozer); 2  Grading-sub-grading the area for a base course is going to cost roughly $28 per square yard for a total of $1876; and.