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Excavation,Trenching and Shoring Safety and the OSHA Excavation Standard - ... Page 3 of 3 <br /> If the location to be excavated has been previously disturbed,as it frequently is along a right-of-way,the <br /> soil type will very likely be classified as "C".With Type C soil,the excavation walls must be sloped back <br /> on each side of the excavation one and one half feet for every foot of depth. <br /> Add all these factors up and it soon becomes clear: sloping, even in conjunction with benching, may be <br /> desirable-but not always very practical and economical. <br /> A competent person must be familiar with the various sloping and benching configurations available, <br /> should that be the choice for protecting workers. In sloping and benching, important points to remember <br /> are the"weakest link"in determining what type of soil is supporting what type. If type C is supporting type <br /> B or any other type of combination, the sloping and benching configuration chosen must be in accordance <br /> with the OSHA standard. Refer to Appendix A of this workbook for the various conditions in which sloping <br /> and/or benching can be used. <br /> http://www.afscme.org/health/excav05.htm 8/25/2005 <br />