WAC 296-874-40006. Make sure supported scaffolds are properly supported

(1) You must make sure supported scaffold poles, legs, posts, frames, and uprights are: (a) Plumb; and (b) Braced to prevent swaying or displacement. (2) You must make sure supported scaffold poles, legs, posts, frames, and uprights, bear on base plates that rest on: (a) Mudsills; or (b) Other firm foundations such as concrete or dry, compacted soil. (3) You must make sure foundations are all of the following: (a) Level; (b) Sound; (c) Rigid; (d) Capable of supporting the loaded scaffold without settling or displacement. Note: The condition of the foundation may change due to weather or other factors. If changes occur, the foundation needs to be evaluated by a competent person to make sure it will safely support the scaffold. (4) You must make sure unstable objects are not used: (a) To support scaffolds or platform units; or (b) As working platforms. (5) You must make sure mobile scaffolds meet these additional requirements: (a) Wheel and caster stems are pinned or otherwise secured in the scaffold legs or adjustment screws; (b) Wheels and casters are locked, or equivalent means are used, to prevent movement when the scaffold is being used; (c) Screw jacks or other equivalent means are used if it's necessary to level the work platform. (6) You must make sure front-end loaders and similar equipment used to support scaffold platforms have been specifically designed for such use by the manufacturer. Reference: When forklifts or other powered industrial trucks are used for personnel lifting on support scaffold platforms, follow the requirements found in Forklifts and other powered industrial trucks, chapter 296-863 WAC.