1. (1) This section classifies pipeline locations for the design of new pipelines. The following criteria apply to classifications under this section.

   1. (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.
   2. (b) Each separate dwelling unit in a multiple dwelling unit building is counted as a separate building intended for human occupancy.

2. (2) Except as provided in subsection (3) of this section, pipeline locations are classified as follows:

   1. (a) A Class 1 location is:

      1. (i) An offshore area; or
      2. (ii) Any class location unit that has ten or fewer buildings intended for human occupancy.
   2. (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.

   3. (c) A Class 3 location is:

      1. (i) Any class location unit that has forty-six or more buildings intended for human occupancy; or
      2. (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.)
   4. (d) A Class 4 location is any class location unit where buildings with four or more stories above ground are prevalent.
3. (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.

[Statutory Authority: RCW 80.01.040, 80.04.060, 81.88.040. WSR 08-12-045 (Docket PL-070974, General Order R-548), § 480-75-360, filed 5/30/08, effective 6/30/08. Statutory Authority: RCW 80.01.040 and 80.04.160. WSR 02-18-032 (Docket No. TO-000712, General Order No. R-500), § 480-75-360, filed 8/26/02, effective 9/26/02.]