25.C Sloping and Benching.
25.C.01 Sloping or benching of the ground must be in accordance with one of the systems outlined below. > See 29 CFR 1926, Subpart P, Appendix B).
Figure 25-1
Figure 25-1 (Continued)
- Allowable configurations and slopes. For excavations less than 20 ft (6 m) in depth, the maximum slope must be 34º measured from the horizontal (1-1/2 horizontal to 1 vertical). These slopes must be excavated to form configurations that are in accordance with the slopes shown for Type C soil. > See also Section 25.A.03 and 29 CFR 1926, Subpart P, Appendices A and B and Figure 25-1.
- Determination of slopes and configurations using classification of soil and rock deposits. > See Section 25.A.03 and 29 CFR 1926, Subpart P, Appendix A. All excavations less than 20 ft (6 m) in depth which have vertically lowered portions must be shielded or supported to a height at least 18 in (.5 m) above the top of the vertical side with a maximum allowable slope of 1-1/2:1. Maximum allowable slopes and allowable configurations for sloping and benching systems, must be determined in accordance with the conditions and requirements set forth in 29 CFR 1926, Subpart P, Appendices A and B. > See also Figure 25-1.
- Designs using other tabulated data. The design must be selected from and be in accordance with written tabulated data, such as charts and tables approved by a RPE. At least one copy of the tabulated data must be maintained at the job site during excavation. The tabulated data must include:
- (1) Identification of the parameters that affect the selection of a sloping or benching system drawn from the data;
- (2) Identification of the limits of use of the data, to include the magnitude and configuration of slopes determined to be safe;
- (3) Explanatory information as may be necessary to aid the user in correctly selecting a protective system from the data; and
- (4) The identity of the RPE who approved the data.
- Design by a RPE. The sloping or benching systems was not created using Options a, b or c above but is instead, approved by a RPE. At least one copy of the design must be maintained at the job site during excavation. Designs must be in writing and include:
- (1) The magnitudes and configurations of the slopes that were determined to be safe for the particular excavation, and
- (2) The identity of the RPE who approved the design, including name, address, telephone, fax and email address.
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25-6. What is the maximum slope for excavations less than 20 ft (6 m) in depth?
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