Immediate Response Actions assess release, threat of release and/or site conditions and, where appropriate, contain, isolate, remove or secure a release or threat of release of oil and/or hazardous material in order to abate, prevent or eliminate an Imminent Hazard to health, safety, public welfare or the environment; and/or respond to other time-critical release, threat of release and/or site conditions. Possible Outcomes of an Immediate Response Action include the completion of an Immediate Response Action by filing of a "Class A" or "Class B" Response Action Outcome Statement, the initiation of a Release Abatement Measure, or the continuation of further Preliminary or Comprehensive Response Actions.