On May 1, 2012, the California State Water Resources Control Board (SWRCB) adopted via Resolution No. 2012-0016 the Water Quality Control Policy for Low-Threat Underground Storage Tank Case Closure (Low-Threat Closure Policy). The Low-Threat Closure Policy finally became effective on August 17th. This should be good news for the thousands of UST sites in California because the Low-Threat Closure Policy will hopefully make it easier to obtain closure. At a minimum it defines more clearer criteria for obtaining closure.
The Low-Threat Closure Policy recognizes that many petroleum release cases pose a low-threat to human health and the environment. The policy’s purpose is to establish consistent California statewide case closure criteria for low-threat petroleum UST sites. To potentially qualify for closure, the site must satisfy eight general criteria (applicable to all sites), as well as media-specific criteria as it pertains to groundwater, vapor intrusion to indoor air and direct contact, and outdoor air exposure. Below is a brief description of each of these criteria.