shall have the meanings given to them in this section unless the
context clearly indicates otherwise:
"Gas." As defined in 49 CFR 192.3 (relating to definitions).
"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 defined and delineated by the
United States Census Bureau, as containing 50,000 or more
people and has a population density of at least 1,000 people
per square mile.
(3) An other populated area defined and delineated by
the United States Census Bureau, as containing a concentrated
population, including, but not limited to, 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.
"Shutoff valve." A mechanical device used to control the
flow of gas or liquid that may be used solely for fully open or
closed applications, to control the direction of flow or to
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