WAC 296-155-740. Cofferdams

(1) If overtopping of the cofferdam by high waters is possible, you must provide means for controlled flooding of the work area. (2) You must develop and post signals for evacuation of employees in case of emergency. (3) You must provide cofferdam walkways, bridges, or ramps with at least two means of rapid exit and guardrails as specified in chapter 296-880 WAC, Unified safety standards for fall protection. (4) You must install manways and ladderways separately from the hoistways and partitioned off to prevent hoisted materials from protruding into or falling into manways and/or ladderways. (5) Pumping equipment must be located on substantially constructed platforms and where installed in such a position that persons must work below, toe boards must be installed on the platform. (6) You must protect cofferdams located close to navigable shipping channels from vessels in transit, where possible.