"Gas high consequence area." A "high consequence area" as
defined in 49 CFR 192.903 (relating to what definitions apply to
this subpart?).
"Hazardous liquid." As defined in 49 CFR 195.2 (relating to
definitions).
"Hazardous liquid high consequence area." Any of the
following:
(1) A commercially navigable waterway where a
substantial likelihood of commercial navigation exists.
(2) A high-population area or urbanized area, defined
and delineated by the United States Census Bureau, that
contains 50,000 or more people and has a population density
of at least 1,000 people per square mile.
(3) Another populated area, defined and delineated by
the United States Census Bureau, containing a concentrated
population, such as an incorporated or unincorporated city,
town, village or other designated residential or commercial
area.
(4) An Unusually Sensitive Area as defined in 49 CFR
195.6 (relating to Unusually Sensitive Areas (USAs)),
including a Class 1b aquifer, a lithology of which includes
limestone, dolomite and locally evaporitic units that contain
documented karst features or solution channels, regardless of
size.
"Potential impact radius." The radius of a circle within
which the potential failure of a pipeline could have significant
impact on people or property.
"Transmission." The transportation, other than gathering, of
gas through a transmission line as that term is defined in 49
CFR 192.3 (relating to definitions) or of hazardous liquids
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