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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 Sec. 1926.652(b)? |
|__________________________|
|
|
YES | NO
______________________|______________________
| |
| |
________|____________________ _________________|________
| | | |
| Excavation must comply with | | Excavations must comply |
| one of the following three | | with Sec. 1926.652(b)(1) |
| options: | | which requires a slope |
|_____________________________| | of 1 1/2 H:1V (34 deg.). |
| | |__________________________|
| Option 1: |
| |
| Sec. 1926.652(b)(3) which |
| requires Appendices A |
| and B to be followed |
| |
| |
| Option 2: |
| |
| Sec. 1926.652(b)(3) which |
| requires other tabulated | FIGURE 2 - SLOPING OPTIONS
| data (see definition to |
| be followed. |
| |
| |
| Option 3: |
| |
| Sec. 1926.652(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 |
| |
| Sec. 1926.652(c)(1) which requires |
| Appendices A and C to be followed |
| (e.g. timber shoring). |
| |
| |
| Option 2 |
| |
| Sec. 1926.652(c)(2) which requires |
| manufacturers data to be followed |
| (e.g. hydraulic shoring, trench |
| jacks, air shores, shields). |
| |
| |
| Option 3 |
| |
| Sec. 1926.652(c)(3) which requires |
| tabulated data (see definition) to |
| be followed (e.g. any system as |
| per the tabulated data). |
| |
| |
| Option 4 |
| |
| Sec. 1926.652(c)(4) which requires |
| the excavation to be designed by a |
| registered professional engineer |
| (e.g. any designed system). |
|____________________________________|
FIGURE 3 - SHORING AND SHIELDING OPTIONS
Note:Authority cited:Section 142.3, Labor Code. Reference: Section 142.3< Labor Code
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