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The NCP has certain requirements for action. Those requirements depend upon whether a response action is a ` "removal" a ction or a 4`remedial" action. For a removal action, the steps included are limited and expeditious. They include a Removal Site Evaluation oo CFR 300.4 10 and a. Removal Action (400 CFR 300.415). A removal site evaluation consists of a . removal preliminary assessment and, if warranted, a removal site inspection. 4 0 CFR 3 00.41 O(a) . A removal si.to evaluation shall b e undertaken "as promptly as possHe." 400 CFR 300.410(b).. The removal prelir inary assessment shall be based on readily available information. Ifremoval action is not required,1 but remedial action under 300.430 may be necessary, a remedial site evaluation shall be initiated. 400 CFR 300.410(1). Removal actions are to "begin as soon as possible to abate; prevent, minimize, stabilize,, mitigate, or eliminate the threat to public health or welfare of the United. States or the nvl.ronment.." 400 CFR 300.415(b)(3 ).2 Under 4 00 CFR 3 00.41 b , removal actions shall be terrnin.at d after 2 million has been obligated for the action or 12 month.. s have elapsed from the date that removal activities begin on.. -s -rte, unless° there is a determination that i there is n Immediate risk to public health or the en irorunent; and continued response actions are immediately required to prevent, limit, or .mitigate an emergency; and such assistance will not otherwise be provided; or (1i) continued response action is otherwise appropriate and consistent with the remedial action to be taken. en. Under o CFR 300.415(g) , if a removal action will not fully address the threat and. the release may require remedial action.,, there sh-all be are orderly transition from removal to remedial response activities. In contrast to the. relatively expeditious and preliminary mature of a removal assessment,, an investigation for a remedial. action in..cludes many more formal and fully developed investigation, planning and implementation steps. These include a Remedial Preliminary Assessment (PA) (4-0 CFR 300. 20 , a Remedial Site Inspection (SI) (4 CFR 300.420(c)) and a Remedial Investigation/Feasibility Studer II FS ) (40 CFR 300.430). "Remedial actions are to be 1 The NCP provides a listing of factors to be considered in determining the appropriateness of a removal action. oo CF 3 00.41 b 1 . These include: Exposure to nearby human populations, animals or the food chair. Contamination of drinking water supplies or sensitive ecosystems Hazardous substances in drums, barrels, tanks, or other bulb storage containers, that may Pose a threat of release High levels of hazardous substances largely near the surface Weather conditions that may cause migration or releases Threat of fire or explosion Availability of other mechanisms to respond Other situations or factors that may pose threats list of removal actions is provided at (e)(1)-(8). such as fences., drainage controls, stabilization. of berms, capping to reduce migration,, using chemicals to retard or mitigate spread, excavation or removal of highly contaminated soils from drainage areas to reduce spread or direct contact,