OAR 340-150-0540: Applicability to Previously Closed UST Systems

When directed by the department, an owner of an UST system permanently closed or abandoned (e.g., left unused without being substantially emptied, decommissioned or permanently altered structurally to prevent reuse) before December 22, 1988, or an owner and permittee for any UST facility for which inadequate decommissioning records are available for review by the department, must assess the excavation zone and close the UST system in accordance with this division if a release from the UST poses, in the judgment of the department, a current or potential threat to human health or the environment.