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Keep materials or equipment that might fall or roll into an excavation at least 2 feet from <br />the edge of excavations, or have retaining devices, or both. <br />Provide warning systems such as mobile equipment, barricades, hand or mechanical <br />signals, or stop logs, to alert operators of the edge of an excavation. <br />Provide scaling to remove loose rock or soil or install protective barricades and other <br />equivalent protection to protect employees against falling rock, soil or materials. <br />Prohibit employees from working on faces of sloped or benched excavation at levels <br />above other employees unless employees at lower levels are adequately protected from the <br />hazards of falling, rolling, or sliding material or equipment. <br />Prohibit employees under loads that are handled by lifting or digging equipment. To <br />avoid being struck by any spillage or falling materials, require employees to stand away from <br />vehicles being loaded or unloaded. If cabs of vehicles provide adequate protection from falling <br />loads during loading and unloading operations, the operators may remain in them. <br />41.38 EXPOSURE MONITORING <br />An initial site reconnaissance will be performed prior to commencement of each <br />workday. Additionally, the site will be monitored under the supervision of the Site Safety <br />Officer during the initial phases of work operations and when conditions at the site change. <br />Equipment may include the following: <br />Photo ionization detector (PID) <br />® Chemical specific Industrial Hygiene (integrated) sampling <br />® Heat stress <br />All monitoring equipment will be calibrated on a per use or daily basis unless specified <br />otherwise by the manufacturer. Maintenance, including factory maintenance, will be conducted <br />44 <br />