Final rules were issued on the siting, design, and construction of Liquefied Natural Gas (LNG) facilities on January 30,1980. In response to petitions for reconsideration, MTB is amending several sections of the final rules. These amendments are: (1) To clarify that any subsequent changes in "existing LNG facilities," as defined by the Pipeline Safety Act of 1979, including expansion of capacity, if made pursuant to an application for approval filed before March 1, 1978, would not be subject to Part 193 siting requirements; (2) to provide that the Director will respond within 90 days to a petition for finding or approval unless the petitioner is otherwise notified; (3) to exclude "pipeline facilities" of the operator from thermal radiation protection requirements; (4) to clarify the vaporization rate for a design spill from a transfer line that penetrates an LNG storage tank below its liquid level; (5) to require the Director's approval for siting LNG storage tanks in certain areas of high seismic activity; (6) to modify the criteria for identification of a high seismic area, where the Director's approval for siting an LNG storage tank is required; (7) to make'only impounding systems for LNG storage tanks subject to requirements relating to penetration by wind borne missiles; (8) to establish a 200 mph wind speed as an upper limit in designing for wind forces; (9) to clarify that any ultraviolet decay of insulation must not be detrimental to the insulation; (10) to clarify that only valves for use in controllable emergencies must have powered local and remote operating capabilities; (11) to clarify the dimensions required for dikes; and (12) to provide that only LNG storage tanks must meet the protection requirements for shared impoundment. MTB has also amended the scope of Part 193 to be consistent with the siting provisions of the memorandum of understanding with the U.S. Coast Guard, amended the definition of "LNG facility" to be consistent with the definition of this term in the Pipeline Safety Act of 1979; and changed the title and scope of Subpart B to refer to "Siting Requirements."