Protective Systems Requirements
Requirements for protective systems include the following:
-Protective system design must be based on soil classification: Stable rock, Type A, B, or C soils. 1541.1 Appendix A (b),(c)
-Soil classification is required as follows unless the protective system design is based on Type C soil:
a. Classification must take into account both site and environmental conditions. 1541.1 Appendix A (a)(1).
b. Soil must be classified by a competent person as Type A, B, or C soil. 1541.1 Appendix A (c)(1).
c. Classification must be based on the results of at least one visual and at least one manual analysis. 1541.1 Appendix A (c)(2) (Note: to view Table and illustration, go to 'docs' tab above, pages 50-51 of the Cal/OSHA Pocket Guide for the Construction Industry).
-Standard shoring, sloping, and benching must be used as specified in 1540 and 1541.1(b) or according to tabulated data prepared by a registered engineer (to view, go to 'docs' tab above, pages 53-55 of the Cal/OSHA Pocket Guide for the Construction Industry)
-Protective systems for excavations deeper than 20 feet shall be designed by a registered engineer. 1541.1 Appendix F
-Additional bracing must be used when vibration or surcharge loads are a hazard. 1541.1 Appendix A
-Excavations must be inspected as needed after every rainstorm, earthquake, or other hazard-increasing occurrence (water in the excavation may require a reclassification of soil type). 1541(k)(1)
-Employees must be protected from falling materials by scaling, installation of protective barriers, or other methods. 1541(j)(1)
-Uprights shall extend to the top of the trench and its lower end not more than 2 feet from the bottom of the trench. 1541(j)(1)
-Employees must be protected from excavated or other material by keeping such material 2 feet from the excavation edge or by using barrier devices. 1541(j)(2)
-Ladders or other safe access must be provided within 25 feet of a work area in trenches 4 feet or deeper. 1541(c)(2)
-Excavation beneath the level of adjacent foundations, retaining walls, or other structures is prohibited unless requirements of 1541(i) have been met. 1541(i)(1)
-Shored, braced, or underpinned structures must be inspected daily when stability is in danger. 1541(i)(2)
-Walkways or bridges with standard guardrails must be installed when employees or equipment are required or permitted to cross over excavations that are at least 6 feet deep and wider than 30 inches. 1541(l)(1)
-Barriers must be erected around excavations in remote locations. All wells, pits, shafts, and caissons must be covered or barricaded, or if temporary, backfilled when work is completed. 1541(l)(2)