PUBLIC LAW 102-508—OCT. 24, 1992 106 STAT. 3291 49 USC app. 1672. (2) by adding at the end the following new subsection: " (i) HIGH-DENSITY POPULATION AREAS. — "(1) IDENTIFICATION OF FACILITIES.— Not later than 2 years Regulations, after the date of the enactment of this subsection, the Secretary shall issue regulations establishing criteria for the identification, by operators of pipeline facilities, of all pipeline facilities that are located in high-density population areas. Such regulations shall provide for such identification to be carried out through the inventory required under subsection (f). " (2) EXCLUSION*OF NATURAL GAS DISTRIBUTION LINES. — Natural gas distribution lines shall not be included among pipeline mcilities required to be identified pursuant to paragraph (1).". (b) MAPS. —Section 3(e)(2) of such Act is amended by inserting "including an identification of areas described in regulations issued under subsection (i)(l)," after "supplementary geographic description,". (c) INSPECTION AND MAINTENANCE PLANS. —Section 13(a)(4) of such Act (49 U.S.C. App. 1680(a)(4)) is amended by inserting "and the protection of the environment" after "public safety". SEC. 103. INCREASED INSPECTION REQUIREMENTS. Section 3(g) of the Natural Gas Pipeline Safety Act of 1968 (49 U.S.C. App. 1672(g)) is amended— (1) by redesignating paragraphs (1) and (2) as subparagraphs (A) and (B), respectively; (2) by inserting "(1) FEDERAL SAFETY STANDARDS. —" after " INSPECTION DEVICES.— "; (3) by indenting paragraph (1), as designated by paragraph (2) of this subsection, and moving such paragraph (1) (including subparagraphs (A) and (B), as designated by paragraph (1) of this subsection) 2 ems to the right; (4) by adding at the end of paragraph (1), as designated by paragraph (2) of this subsection, the following new sentence: "The Secretary may extend such regulation to require existing transmission facilities, whose basic construction would accommodate an instrumented intemal inspection device, to be modified to permit the inspection of such facilities with instrumented internal inspection devices."; and (5) by adding at the end the following new paragraph: "(2) PERIODIC INSPECTIONS.—Not later than 3 years after Regulations, the date of the enactment of this paragraph, the Secretary shall issue regulations requiring the periodic inspection of each pipeline identified pursuant to subsection (i) by the operator of the pipeline. In issuing the regulations, the Secretary shall prescribe the circumstances, if any, under which such inspections shall be conducted with an instrumented internal inspection device. In those circumstsuices under which an instrumented internal inspection device is not required, the Secretary shall require the use of an inspection method that is at least as effective as the use of such a device in providing for the safety of the pipeline.". SEC. 104. EXCESS FLOW VALVES. Section 3 of the Natural Gas Pipehne Safety Act of 1968 (49 U.S.C. App. 1672) is further amended by adding at the end the following new subsection: "( j) EXCESS FLOW VALVES.—
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