Where soils are configured in layers, i.e., where a layered geologic structure exists, the soil must be classified on the basis of the soil classification of the weakest soil layer.

Soil classification system means, for the purpose of this subpart, a method of categorizing soil and rock deposits in a hierarchy of Stable Rock, Type A, Type B, and Type C, in decreasing order …

Dec 12, 2025 · OSHA standards classify soil and rock deposits into four categories based on decreasing stability: Stable Rock, Type A, Type B, and Type C. Stable Rock is the most …

Welcome to this detailed overview of soil classification for excavations, drawn directly from OSHA’s Appendix A to Subpart P (Excavations). Proper classification is crucial for selecting …

Jan 6, 2025 · Different soil types require different slope angles to prevent cave-ins and ensure worker protection. This comprehensive guide breaks down the maximum allowable slopes for …

The Occupational Safety and Health Administration (OSHA) categorizes soil and rock deposits into four classes: Stable Rock, Type A Soils, Type B Soils, and Type C Soils.

Where different soils are configured in layers, the soil shall be classified under the weakest soil layer. However, each layer may be classified individually where a more stable layer lies under …

This appendix describes a method of classifying soil and rock deposits based on site and environmental conditions, and on the structure and composition of the earth deposits. The …

On excavation sites where there is more than one soil type present, the Competent Person will test and classify each area or layer separately, and then adjust the selection of protective …

This chapter is intended to assist OSHA Technical Manual users, safety and health consultants, OSHA field staff, and others in the recognition of trenching and shoring hazards and their …