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<br /> 169 <br /> 1'21.&53(11) OCCUPATIONAL SAFETY "~D HEALTH <br /> STANDARDS AND INTERPRETATIONS <br /> (n) "Tren~h"-A narrow excavation made (q) "Unstable soil" - Earth material. other <br /> below the surface of the ground. In general, than runnin~. that because of its nature or <br /> the depth is greater than the width, but the the influence of related conditions. cannot <br /> width of a trench is not greater than 15 feet. be depended upon to remain in place without <br /> extra support, such as would be furnished <br /> (0) "Trench jack" - Screw or hydraulic type by a system of shoring, <br /> jacks used as cross bracing in a trench <br /> shoring system. <br /> (r) "Uprights" - The vertical members of a <br /> (p) "Trench shield" - A shorin~ system shoring system. <br /> composed of steel plates and bracing, welded <br /> or bolted together, which support the walls (I) "Wales"-See paragra ph (m) of this <br /> of a trench from the ground level to the trench section. <br /> bottom and which can be moved along as work <br /> progresses. (t) "W ails" - See paragraph (k) of this section. <br /> 192U53(&) 18' <br />