Hazardous Liquids Transmission

49 CFR 195

• A commercially navigable waterway, which means a waterway where a substantial likelihood of commercial navigation exists.
• A high population area, which means an urbanized area, as defined and delineated by the Census Bureau, that contains 50,000 or more people and has a population density of at least 1,000 people per sq. mile.
• Another populated area, which means a place, as defined and delineated by the Census Bureau, that contains a concentrated population, such as an incorporated or unincorporated city, town, village, or other designated residential or commercial area.
• An unusually sensitive area, as defined in DOT Regulation 49 CFR 195.6

Gas Transmission: 49 CFR 192

METHOD A

• A current class 3 location.
• A current class 4 location.
• Any areas outside a class 3 or location where the potential impact radius is greater than 660 feet, and the potential impact circle contains 20 or more buildings intended for human occupancy.
• An operator in an area with a potential impact circle of greater than 660 feet may use a prorated formula to determine the HCA (see operators for details).
• The area within a potential impact circle containing an identified site.

METHOD B

• The area within a potential impact circle containing 20 or more buildings intended for human occupancy.
• The area within a potential impact circle containing an identified site.