WAC 16-237-190
WAC 16-237-190. Inventory requirements
A warehouse not licensed prior to July 1, 1983, must meet the following requirements:
(1) Tanks and stices over two hundred bushels per foot must have inventory holes situated in such a manner as to allow the measurement of the high and low points of the commodity.
(2) Conventional flat storage must have an overhead catwalk with a minimum of five feet of headroom.