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0 0 <br /> • the identity of the registered professional engineer approving the design . <br /> • At least one copy of the engineer's plan must be kept at the work site during construction <br /> of the protective system. After that time the data may be stored offsite but will be <br /> available upon request of the inspector. <br /> Employees who work within the excavation must be provided with protection systems <br /> such as sloping, benching, shoring, bracing, or underpinning to ensure the stability of <br /> adjacent structures such as buildings, walls, sidewalks, or pavement. Another form of <br /> protection known as a trench box or shield (also known as a welder's hut) can also be <br /> utilized as a form of protection. However, this method is known as an alternative <br /> protection system and thus, must be approved by a Registered Professional Engineer. <br /> In the State of California, that person must be a Registered Civil Engineer. <br /> Excavation will not be conducted below the level of the base or footing of any foundation <br /> or retaining wall unless (1) a support system such as underpinning is provided, (2) the <br /> excavation is in stable rock, or (3) a Registered Professional Engineer determines that <br /> the structure is sufficiently removed from the excavation and that excavation will not <br /> pose a hazard to employees. Excavation under sidewalks and pavement is also <br /> prohibited unless an appropriately designed support system is provided or another <br /> effective method is used. <br /> 512.6 INSTALLATION AND REMOVAL OF PROTECTIVE SYSTEMS <br /> The following procedures are for the protection of employees during installation and <br /> removal of protective systems: <br /> • Securely connect members of support systems to prevent sliding, falling, <br /> kickouts, or other predictable failures; <br /> • Safely install support systems in a manner that protects employees form cave-ins, <br /> collapses, or from being struck by members of the support system; <br /> • Never overload members of support systems, and <br /> • Install other structural members to carry loads imposed on the support system <br /> when temporary removal of individual members is necessary. <br /> As soon as work in the excavation is completed, the excavation will be backfilled as the <br /> protective system is dismantled. After the excavation has been cleared, workers will <br /> slowly remove the protective system from the bottom up, taking care to release the <br /> system slowly. <br /> 4 <br />