Appendix D does NOT provide a chart for the use of vertical shores in which soil type?

The correct answer is that Appendix D does not provide a chart for the use of vertical shores in Type C soil. This is significant because Type C soils are generally considered the least stable and most dangerous for excavation work. Due to their low cohesion and higher likelihood of collapse, regulatory guidelines typically require more stringent protective measures. As a result, vertical shoring may not be specified in the same way as it is for more stable soils.

Type A and Type B soils are generally more stable, and they have guidelines and charts for the use of vertical shores provided in Appendix D. Type D is not a recognized category within the soil classification system commonly used for excavation safety. The absence of guidelines for the use of vertical shores in Type C reinforces the need for more robust support systems and precautions when working with these less stable soil types to ensure worker safety.