Iowa Admin. Code r. 21-44.51
"Minimally manipulated manures." Minimally processed, nonliquid substances composed primarily of excreta, plant remains, or mixtures of such substances.
"Minimally processed." Processing a nonliquid substance in a manner which does not modify the nutrient value on a dry matter basis.
"Mobile containers." Containers designed and used for transporting fertilizer or soil conditioner materials.
"Nonmobile containers." All containers not defined as mobile.
"Permanent storage site." Location where nonmobile containers are used for fertilizer and soil conditioner storage in quantities of 5,000 gallons or more. One container or a combination of containers with a volume of 5,000 gallons or less is exempt.
"Secondary containment." Any structure used to prevent runoff or leaching of fertilizer or soil conditioner materials.
Iowa Admin. Code r. 21-44.51