Materials stored in tiers are secured by stacking, racking, blocking, interlocking or other means so they cannot slide, fall or collapse. Stored loads on floors may not exceed maximum safe load limits, which employers post conspicuously, stated in pounds per square foot, in every storage area, except on floors or slabs on grade and in single-family homes and wood-framed multi-family residential buildings. Aisles and passageways are kept clear and in good repair for material handling equipment and employees, and ramps, blocking or grading are used where road or working levels differ. Inside buildings under construction, material is not stored within 6 feet of a hoistway or inside floor opening, or closer than 10 feet to any exterior wall that does not rise above the top of the stored material. Employees who must work on stored material in hoppers, silos, tanks and similar storage are given Subpart M personal fall arrest equipment. Incompatible materials are segregated; bagged materials are stacked with stepped-back layers cross-keyed at least every 10 bags high; scaffolds and runways hold no more material than immediate operations need; brick stacks are no higher than 7 feet and loose brick stacks taper back 2 inches per foot above 4 feet; masonry block stacks above 6 feet taper back half a block per tier; used lumber has nails removed before stacking, lumber is stacked stable and self-supporting on level solid sills, no higher than 20 feet or 16 feet if handled manually; and unracked pipe, poles, bar stock, structural steel and other cylindrical materials are stacked and blocked against spreading or tilting. Storage areas are kept free of accumulations that create tripping, fire, explosion or pest hazards, with vegetation controlled as needed. Dockboards are strong enough for their loads, portable ones are secured and have handholds, and positive protection keeps railroad cars from moving while a dockboard or bridge plate is in position.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.