WAC 16-201-110
WAC 16-201-110. Primary containment of liquid bulk fertilizers—Prohibition against underground storage
No person shall store liquid bulk fertilizer, fertilizer spills or rinsates in an underground storage container or surface impoundment, such as a lined pond or pit. A watertight catch basin or sump used for the temporary collection of rinsate or runoff from transfer and loading areas is exempt from this section.