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Division of Waste Management
Underground Storage Tank Branch

Assessment and Remediation

Assessment of soil and groundwater is necessary in certain cases. If contamination above screening levels is found then it may have to be defined and the soil and/or groundwater may require remediation. Releases may result due to a number of reasons. Most commonly, the underground storage tank (UST) system develops a small leak and the release is fairly constant over an extended period of time. Releases may also result from a catastrophic failure of the UST system.

Regardless of the cause, the effects of a release can be very damaging to soil and groundwater. Groundwater contamination can be especially difficult to remediate. Often, the cleanup and remediation process can take more than three years and several hundred thousand dollars to complete.

In the UST Branch, there are two Additional Evaluation (AE) Sections -- AE I and AE II. Both review incoming reports for technical completeness, site checks, environmental site assessments, closure and replacement of regulated UST systems, and site investigations. The two sections also direct site investigation activities and interim corrective action as well as provide regulatory expertise to owners, operators and professionals.

A site with defined contamination will typically be referred to the Corrective Action (CA) Section of the UST Branch for remediation. The CA Section is responsible for providing technical review of Corrective Action Plans, providing approval and cleanup oversight associated with soil and/or groundwater remediation and reviewing quarterly monitoring reports for groundwater at contaminated UST sites.

The following USTB staff assignment list is updated regularly:


To report a release or suspected release call the Environmental Response Branch.