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B � <br /> Excavation, Trenching and Shoring Safety and the OSHA Excavation Standard- ... Page 2 of 3 <br /> method of cutting back the trench walls at such an angle that there is little chance of collapse. This is <br /> referred to as an angle of repose",and must be suitable to the type of soil. <br /> 12'M ax. <br /> Al <br /> D2 <br /> Simple Slope Type A <br /> Benching is a process of stepping off the earthen walls of an excavation. <br /> l <br /> 3 <br /> 3fC <br /> 20 Mui <br /> 4 <br /> b�Ie� t <br /> Sloping can be used as a system by itself or in conjunction with benching. <br /> 0 <br /> 20'M ax. 1 <br /> 5' <br /> Max. 3/4 <br /> i <br /> 4 Max. f• <br /> f <br /> In the real world there are veryfew applications where sloping and/or benching can be used.Why?Most <br /> often, the luxury of available space is the first consideration. Many excavations are dug in right-of-ways <br /> where the presence of other utilities and traffic become major considerations. Moreover, for every cubic <br /> yard of soil that is removed, it is very likely that nearly the same amount of material must be put back, <br /> and compacted as well. <br /> asp �r <br /> i V2 <br /> Simple Slope in Type C Soil <br /> http://www.afscme.org/health/excav05.htm 8/25/2005 <br />