OSHA 30- Excavation Hazards, Soils Questions with correct Answers

OSHA 30- Excavation Hazards, Soils Questions with correct Answers A cubic yard of soil can weigh as much as: A small pickup truck To be classified as type A, the soil cannot be All of the above (disturbed, part of a mixed layered system, subject to vibration, seeping water When your trench is deeper than 4 ft and hazards may be present, air monitoring must be done before entry True A soil cannot be Type A if it is: All of the above Which of the following are common soil classification tests? All except C A soils are usually clay and cemented soils such as caliche and hardpan True Each of the following is Type B soil EXCEPT: Sand The definition of type C-60 soil is provided by manufactures to allow the competent person an opportunity to use vertical shores or other protective systems in accordance with tables provided by the manufacture True The most important distinction b/w stable rock types A&B and type C is: Degree of stability A defining feature of stable rock is that it will: Remain intact while exposed OSHA requires that the competent person perform two visual and two manual test on a soil sample fresh out of the ground and not impacted by weather conditions at the site False Aluminum hydraulic shoring permits both installation and removal without entering the trench True Shores must be pumped to a minimum of 750 pounds of pressure but more is recommended True Type B soils afford how many options of protection? Four Which soil type is the most common? Type B Which of the following statements is true of kickout? All of the above Mixed oak timber have a greater bending strength per square inch than Douglas fir False In type C soil, the angle of repose is very low, how many degrees must the angle be? 34 The depth at which an excavation needs attention from a registered professional engineer is: 20 ft Placing a shield (e.g., trench shield or trench box) between the side of an excavation and the work area can minimize the risk in the event of a cave in. True Shoring and shielding can be custom built from tabulated data approved by a registered PE. True The struts of a screw jack system must be adjusted manually, which creates a hazard because the worker is required to: Be in the trench in order to adjust the strut All systems have a set of manufacturer's tabulated data to be used for proper design and installation of the equipment True When using a ladder in a trench, it must be: All of the above A surface encumbrance is anything that could create a ___ in or around a trench. Hazard Walkways must have handrails when at __ or more above lower level 6 ft A competent person must inspect all excavations, adjacent areas, and protective systems daily, ____, and as needed throughout the shift. Before work begins Establishing eye contact with your equipment operator is a general safety principle when working outside the working radius. True Being dangerously close to a falling load is: Not allowed Each of the following is true of accumulating water hazards EXCEPT: Special supports or shield are not allowed. Warning systems for mobile equipment include barricades, hand signals, stop logs True All surface encumbrances must be removed or supported within: The zone of influence Each of the following is true of underground installations EXCEPT: They must be removed When exposed to vehicular traffic, your excavation site must have: All of the above Which of these did OSHA recommend? Keep excavated material 2 ft from excavation, protect walls to prevent cave-ins, employers must instruct employees on hazard recognition and regulations, provide ladder if trench 4 ft or more in depth. The competent person must have authority to correct hazards. Who give the competent person this authority? The person's employer The competent person must be a superintendent, foreman, or project manager. False The topic is about the practical application of the Fed-OSHA Excavation standard regarding: All of the above