Emil Onuschak, Jr., PG, State of Delaware, Department of Natural Resources and Environmental Control, Underground Storage Tank Branch, 391 Lukens Drive, New Castle, DE 19720-2774, Tel: 302-395-2500, Fax: 302-395-2601, E-mail: eonuschak@DNREC.State.de.us

Since adopting a risk-based site assessment procedure in 1999, both the number and percentage of "old" leaking underground storage tank sites in Delaware have increased markedly. Many of these "old" sites previously were undergoing prolonged ground-water monitoring with no clear criteria for their closure.

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