# COMAR Title 26 — Department of the Environment

## Subtitle 10 — Oil Pollution Control and Storage Tank Management

### Chapter 10 — Out-of-Service UST Systems and Closure

#### Regulation .03 Assessing the Site at Closure or Change-in-Service.

*COMAR 26.10.10.03*

A. Before applying for an extension for temporary closure or completing a permanent closure or change-in-service of a UST system, an owner and an operator of a UST system shall:

  (1) Perform a site assessment to determine if there is evidence of a spill, release, or discharge where contamination would most likely be present; and

  (2) In selecting sample types, sample locations, and measurement methods consider:

    (a) The method of closure;

    (b) The nature of the stored regulated substance;

    (c) The type of backfill;

    (d) The depth to groundwater; and

    (e) Other factors appropriate for identifying the presence of a spill, release, or discharge.

B. If contaminated soil, contaminated groundwater, free product, or vapor is discovered while performing the actions under §A of this regulation or by any other manner during a UST system closure or change-in-service activities, an owner, an operator, and a person in charge of a UST system shall:

  (1) Notify the Department within 2 hours of the discovery, as required in COMAR 26.10.08; and

  (2) Begin performing the response and corrective actions required in COMAR 26.10.09.