Section 5C of chapter 21E of Massachusetts General Laws, as so appearing, is hereby amended by adding the following subsections:-

(l) A department audit of response actions at the site or portion of the site owned or operated by an eligible person, as delineated in a waste site cleanup activity opinion, for which a permanent solution or remedy operations status exists and is maintained or has been achieved and maintained in accordance with such opinion, which identifies no violations of this chapter and regulations promulgated thereto, or if such violations are identified, they are promptly corrected, shall be deemed as conclusive evidence that the eligible person has no liability, and the department may take no action as to such eligible person, for any releases at any property not previously identified as part of the site or any other disposal site. Notwithstanding any general or special law to the contrary, the department shall not promulgate regulations relative to this section.

(m) No person shall be liable for any substantial release migration at any property not previously identified as part of a disposal site or any other disposal site if the department of environmental protection: (i) has, at any time before the effective date of this act, performed an audit of response actions at a site, or a part of a site; and (ii) (1) determined that a permanent solution or remedy operations status was achieved and maintained in accordance with a waste site cleanup activity opinion or any other notification to such person or (2) has notified such person that a violation of chapter 21E of the General Laws or any regulation was identified and promptly corrected.

(n) The department shall have no defense in any action or claim, nor shall the department present evidence to contest liability of an eligible person, upon a showing that a permanent solution or remedy operations status was achieved and maintained.

(o) For properties impacted by any substantial release migration from any property not previously identified as part of a disposal site or any other disposal site, the department shall take or arrange for such response actions as it reasonably deems necessary to assure a condition of no significant risk of harm to human health exists or has been achieved at any such impacted property."