Upon confirmation of a release in accordance with §334.74 of this
title (relating to Release Investigation and Confirmation Steps) or after
a release from the aboveground storage tank (AST) or underground storage tank
(UST) system is identified in any other manner, owners and operators must
perform the following initial response actions within 24 hours of a release:
(1) report the release to the agency (e.g., by completed telephone
call, facsimile transmission, or electronic mail);
(2) take immediate action to prevent any further release of
the regulated substance into the environment, including shutting down the
leaking AST or UST system as determined necessary; and
(3) identify and mitigate fire, explosion, and vapor hazards.
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