¹ Delaware's Tier 0 applies to all new sites entering the program, such as at removal or abandonment. An existing leaking underground storage tank (LUST) site may enter at Tiers 1,2 or 3, depending on the amount of site-specific data collected. Above Tier 0, TPH-GRO and TPH-DRO are replaced by a list of chemicals of concern.

² Analysis for MTBE may not require the Department's discretion when conclusive documentation can be presented describing that the tank's period of use ended prior to 1978.  For gasoline UST's only, lead, EDB, and EDC analysis is required unless conclusive documentation is presented and pre-approved by the UST Branch that the gasoline UST was installed after 1/1/88.  Lead, EDB and EDC analysis is always required for aviation gasoline USTS.

³ Used Oil is defined as described in Part A, Section 2, of Delaware's UST Regulations and Delaware's Hazardous Waste Management Branch Regulations.

⁴ "Other" may mean Metals, Volatiles, Semivolatiles, EDB, EDC, or other as required on a site-specific basis.

* Contact Delaware's UST Branch for required methodologies.

Note: Standards regarding both TAME and TBA can be viewed on the DNREC website before the end of 2002.

Contact: Patricia M. Ellis, Ph.D., Delaware Department of Natural Resources & Environmental Control, 302-395-2500

E-mail: pellis@state.de.us

Website: http://www.dnrec.state.de.us/dnrec2000/divisions/awm/usd

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