WAC 296-155-66411. Appendix F—Selection of protective systems

The following figures are a graphic summary of the requirements contained in Part N for excavations 20 feet or less in depth. Protective systems for use in excavations more than 20 feet in depth must be designed by a registered professional engineer in accordance with WAC 296-155-657 (2) and (3). FIGURE N-27 - PRELIMINARY DECISIONS FIGURE N-27 - PRELIMINARY DECISIONS FIGURE N-28 - SLOPING OPTIONS FIGURE N-28 - SLOPING OPTIONS FIGURE N-29 - SHORING AND SHIELDING OPTIONS FIGURE N-29 - SHORING AND SHIELDING OPTIONS