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The following figures are a graphic summary of the requirements contained in Article 6 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 1541.1(b) and (c).
_________________________ | | | Is the excavation more | | than 5 feet in depth? | |_________________________| | | ____________________ | ___________________ | | NO | YES | | | Is there potential |_________|__________| Is the excavation | | for cave-in? | | entirely in | |____________________| | stable rock? | | |___________________| | | | ________________________ | | NO | | YES | |___________| Excavation may be made |__________| | | with vertical sides. | | | |________________________| | | | | | | ________________________ | | YES | | NO | |___________| Excavation must be |__________| | sloped, shored, or | | shielded. | |________________________| | Sloping | Shoring or shielding ______________________|________________________ | selected. selected. | | | ______|_________ _________|______ | | | | | Go to Figure 2 | | Go to Figure 3 | |________________| |________________| FIGURE 1 - PRELIMINARY DECISIONS _________________________ | | | Sloping selected as the | | method of protection | |_________________________| | | ___________|______________ | | | Will soil classification | | be made in accordance | | with 1541.1(b)? | |__________________________| | | YES | NO ______________________|______________________ | | | | ________|____________________ _________________|________ | | | | | Excavation must comply with | | Excavations must comply | | one of the following three | | with 1541.1(b)(1) | | options: | | which requires a slope | |_____________________________| | of 1 1/2 H:1V (34 deg.). | | | |__________________________| | Option 1: | | | | 1541.1(b)(2) which | | requires Appendices A | | and B to be followed | | | | | | Option 2: | | | | 1541.1(b)(3) which | | requires other tabulated | FIGURE 2 - SLOPING OPTIONS | data (see definition) to | | be followed. | | | | | | Option 3: | | | | 1541.1(b)(4) which | | requires the excavation to | | be designed by a registered | | professional engineer. | |_____________________________| ____________________________________ | | | Shoring or shielding selected | | as the method of protection. | |____________________________________| | | _______________|____________________ | | | Soil Classification is required | | when shoring or shielding is | | used. The excavation must comply | | with one of the following four | | options: | |____________________________________| | | | Option 1 | | | | 1541.1(c)(1) which requires | | Appendices A and C to be followed | | (e.g. timber shoring). | | | | | | Option 2 | | | | 1541.1(c)(2) which requires | | manufacturers data to be followed | | (e.g. hydraulic shoring, trench | | jacks, air shores, shields). | | | | | | Option 3 | | | | 1541.1(c)(3) which requires | | tabulated data (see definition) to | | be followed (e.g. any system as | | per the tabulated data). | | | | | | Option 4 | | | | 1541.1(c)(4) which requires | | the excavation to be designed by a | | registered professional engineer | | (e.g. any designed system). | |____________________________________| FIGURE 3 - SHORING AND SHIELDING OPTIONSNote:Authority cited:Section 142.3, Labor Code. Reference: Section 142.3< Labor Code