RCW 68.24.020: Surveys and maps.

Every cemetery authority, from time to time as its property may be required for cemetery purposes, shall:

(1) In case of land, survey and subdivide it into sections, blocks, plots, avenues, walks, or other subdivisions; make a good and substantial map or plat showing the sections, plots, avenues, walks or other subdivisions, with descriptive names or numbers.

(2) In case of a mausoleum, or columbarium, it shall make a good and substantial map or plat on which shall be delineated the sections, halls, rooms, corridors, elevation, and other divisions, with descriptive names or numbers.