the cleanup or removal of released hazardous substances into the environment, such actions as may be necessary to monitor, assess, and evaluate the release of hazardous substances, the disposal of removed material, or the taking of such other actions as may be necessary to prevent, minimize, or mitigate damage to the public health or welfare or to the environment, which may otherwise result from a release or threat of release. The term includes, in addition, without being limited to, security fencing, or other measures to limit access, provision of alternative water supplies, temporary evacuation and housing of threatened individuals not otherwise provided for, action under section 9404(b) [CERCLA section 104(b)] of this title, and any emergency assistance which may be provided under the Disaster Relief and Emergency Assistance Act.
Id.