SECTION 1. Section 4 of Chapter 21K of the General Laws, as appearing in the 2020 Official Edition is hereby amended by deleting the first paragraph of Section 4 replacing it with the following:-

Section 4. The department may, at the request of the local fire department or on its own authority, dispatch member departments of the hazardous materials mitigation emergency response plan to a site in the commonwealth or in any other state as directed or requested for the purpose of conducting an emergency mitigation response for a hazardous material release, threat of release or to ensure the health and welfare of public safety officials or the general public from potentially hazardous substances. The department may, on its own authority,  dispatch member departments of the hazardous materials mitigation emergency response plan to a site in the commonwealth to perform duties within its abilities to assist during other emergencies or potential emergencies, or assist another agency. During a declared emergency mitigation response action, the team leader shall have complete operational authority for hazardous materials team operations at all times. Once the team leader has determined that the imminent threat of harm from the hazardous materials release or potentially hazardous substance has been satisfactorily mitigated, the team leader shall thereafter notify the incident commander. The incident commander shall have authority over the emergency mitigation response site during a declared emergency mitigation response.

SECTION 2. Section 5 of Chapter 21K of the General Laws, as appearing in the 2020 Official Edition is hereby amended by deleting paragraph (a) and replacing it with the following:-

(a) Except as otherwise provided in this section: (1) the owner or operator of a vessel or a site from which there is or has been a release or threat of release of hazardous materials; (2) any person who at the time of storage or disposal owned or operated any vessel or site from which said hazardous materials were stored or disposed and from which there has been a release or threat of release; (3) any person who by contract, agreement or otherwise directly or indirectly arranged for or engaged in the transport, disposal, storage or treatment of hazardous materials in a site or from a vessel from which there is or has been a release or threat of release of hazardous materials; or (4) any person who otherwise caused or is legally responsible for a release, threat of release of hazardous materials from a vessel or a site, or is responsible for the manufacturing, transporting or in possession of hazardous materials which may be detrimental to the health and welfare of public safety officials or the general public shall be liable, without regard to fault, to the commonwealth for the reimbursement of all associated costs, as determined by the department, for an emergency mitigation response action.