Pennsylvania Statutes Title 35 P.S. Health and Safety § 6026.505. Reopeners

(1) fraud was committed in demonstrating attainment of a standard at the site that resulted in avoiding the need for further cleanup of the site;

(2) new information confirms the existence of an area of previously unknown contamination which contains regulated substances that have been shown to exceed the standards applied to previous remediation at the site;

(3) the remediation method failed to meet one or a combination of the three cleanup standards;

(4) the level of risk is increased beyond the acceptable risk range at a site due to substantial changes in exposure conditions, such as in a change in land use from nonresidential to a residential use, or new information is obtained about a regulated substance associated with the site which revises exposure assumptions beyond the acceptable range. Any person who changes the use of the property causing the level of risk to increase beyond the acceptable risk range shall be required by the department to undertake additional remediation measures under the provisions of this act; or