; and (D) performance measures to determine the effectiveness of excavation damage prevention efforts. . 19. Integrity management study (a) In general Not later than 45 days after the date of enactment of this Act, the Secretary of Transportation shall enter into an agreement with the National Academies under which the National Academies shall conduct a study of the effectiveness of integrity management regulations applicable to natural gas and hazardous liquid pipeline facilities. (b) Data sources In carrying out the study under subsection (a), the National Academies shall— (1) use publicly available data from the Pipeline and Hazardous Materials Safety Administration, State pipeline regulatory agencies, and other public sources; and (2) consult with pipeline stakeholders in the development of findings under the study, including State and Federal regulators, pipeline operators, public safety organizations, and environmental organizations. (c) Elements The study described under subsection (a) shall include— (1) a review of previous assessments of integrity management program implementation produced by or for the Secretary or the National Transportation Safety Board; (2) a review of the implementation and enforcement by the Secretary of integrity management regulations and any modifications of the regulations issued by the Secretary pursuant to section 60109 of title 49, United States Code; (3) a trend analysis and assessment of pipeline safety incidents, accidents, and repairs for high consequence and non-high consequence areas, including comparing— (A) the frequency of such incidents, accidents, and repairs before and after the implementation of the Federal integrity management requirements described in subsection (a); and (B) the frequency of such incidents, accidents, and repairs during the period of time such integrity management requirements have been in effect; (4) development of metrics to gauge the effectiveness of the implementation and enforcement of such integrity management regulations