WAC 480-75-360
Class locations.
(1)This section classifies pipeline locations for the design of new pipelines. The following criteria apply to classifications under this section.#
(a)A "class location unit" is an onshore area that extends 220 yards (200 meters) on either side of the centerline of any continuous one mile (1.6 kilometers) of pipeline.#
(b)Each separate dwelling unit in a multiple dwelling unit building is counted as a separate building intended for human occupancy.#
(2)Except as provided in subsection (3) of this section, pipeline locations are classified as follows:#
(a)A Class 1 location is:#
(i)An offshore area; or#
(ii)Any class location unit that has ten or fewer buildings intended for human occupancy.#
(b)A Class 2 location is any class location unit that has more than ten but fewer than forty-six buildings intended for human occupancy.#
(c)A Class 3 location is:#
(i)Any class location unit that has forty-six or more buildings intended for human occupancy; or#
(ii)An area where the pipeline lies within 100 yards (91 meters) of either a building or a small, well-defined outside area (such as a playground, recreation area, outdoor theater, or other place of public assembly) that is occupied by twenty or more persons on at least five days a week for ten weeks in any twelve-month period. (The days and weeks need not be consecutive.)#
(d)A Class 4 location is any class location unit where buildings with four or more stories above ground are prevalent.#
(3)The pipeline company must adjust the continuous one-mile of pipeline referenced in subsection (1)(a) of this section by including all buildings in the higher class location. The class location unit must encompass the highest classification of buildings.#