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-2- "Remedial" actions, on the other hand, are defined -in ERLA to include actions consistent with permanent remedy instead of or in addition to "Removal" actions. Generally, the cleanup of a hazardous waste site involves a three phase program: 1) Remedial Investigation/Feasibility Study - investigation of the extent, magnitude and nature of the release or threatened release, and identification and selection of. the most cost effective removal or remedial action(s) , and 2) Remedial Design - detailed design of the selected cost effective removal or remedial action(s) , and 3) Response Action - implementation of removal or remedial action(s) . All proposed PLP sites have been assigned to one or more response action classes as required by MCAR 7044.0300. The proposed PLP is presented by response action class. Each of the four response action classes is defined as follows: CLASS A -Declared emergencies. This class includes those sites at which an official emergency has been declared by the MPCA Director pursuant to ERLA. According to MCAR 7044,0200, an "emergency" means that there is an imminent risk of fire or explosion, that a temporary water supply is needed where an advisory has been issued, or that immediate adverse human health effects may be anticipated due to direct contact or_ inhalation, and an advisory has been issued. An "advisory" means a warning by the MPCA Director, Minnesota- Deparment of" Health, --- -- Minnesota Department of Natural Resources, or the Minnesota Department of Agriculture issued to the public concerning a hazardous substance, or pollution or contamination at or near a facility. CLASS B - Long-term monitoring and/or operation and maintenance at a site that has undergone previous response actions. This class includes those sites where activities are necessary to maintain response action(s) that have previously been completed. Examples include continuing operation of a ground water pump-out system at a site, long-term monitoring, and work necessary to maintain the integrity of the site, such as maintaining cover or closure at a site. CLASS C - Other response actions which may include the first year costs associated with operation and maintenance at a site. This class inc u es all sites where remed—ial design and imp ementation of response actions (other than Class A or B) such as barrel removals, decontamination, first year ground water pump-out or monitoring, and other activities that are necessary to effect a permanent remedy or cleanup of the site. This class -also includes the design phase in preparation for a response action, such as designing a ground water -pump out system or a- barrel removal action. CLASS D - Remedial investigations and feasibility studies (RI/FS) . This class includes all sites which require investigation of the extent, magnitude and nature of the release or threatened release and