An official website of the United States government.

Underground Storage Tanks (USTs)

Expedited Site Assessment Tools for Underground Storage Tank Sites: A Guide for Regulators

(EPA 510-B-97-001, March 1997 and EPA 510-B-16-004, October 2016)

This document, first issued in 1997, discusses the expedited site assessment process, which is a framework for rapidly characterizing UST site conditions for corrective action decisions. This concept has been described with other names including: accelerated site characterization, rapid site characterization, and expedited site investigation. In October 2016, EPA revised the document by updating Chapter V - Direct Push Technologies. The entire document carries the same title but a new number: EPA 510-B-16-004.

NOTE: QA documents referred to in some of the following chapters may be outdated. Visit The EPA Quality System website for the latest version of EPA's QA documents.

For assistance with accessibility for the PDFs, please email Sharon Fredericks (

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.