Type A Soils are cohesive soils with an unconfined compressive strength of 1.5 tons per square foot (tsf) (144 kPa) or greater. Examples of Type A cohesive soils are often: clay, silty clay, sandy clay, clay loam and, in some cases, silty clay loam and sandy clay loam.

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 of stability.

What are the soil classification categories? Type C soil. See Appendix A to Subpart P of Part 1926 – Soil Classification. Stable Rock – Natural solid mineral matter that can be excavated with vertical sides and remain intact while exposed.

OSHA categorizes soil and rock deposits into four types, A through D, as follows: B. Type A Soils are cohesive soils with an unconfined compressive strength of 1.5 tons per square foot (tsf) or greater. Examples of Type A cohesive soils are often: clay, silty clay, sandy clay, clay loam and, in some cases, silty clay loam and sandy clay loam. C.

Here is an overview of the different rock and soil types spelled out in the OSHA excavation standard, starting with the most stable and least likely to cave-in, and ending with the most unstable type:

Estimate the range of particle sizes and the relative amounts of the particle sizes. Soil that is primarily composed of fine-grained material is cohesive material. Soil composed primarily of coarse-grained sand or gravel is granular material.

OSHA Cohesive Soil Types (A, B, or C) can be identified by the texture of a given soil. Shown below on the left is the U.S. Department of Agriculture Texturl Soil Classification Chart. This chart plots soil composition as a percentage of sand, silt, …

OSHA classifies soils into four categories: Solid Rock, Type A, Type B, and Type C. Solid Rock is the most stable, and Type C soil is the least stable. Soils are typed not only by how cohesive they are, but also by the conditions in which they are found.

IV. Determination of Soil Type. OSHA categorizes soil and rock deposits into four types, A through D, as follows: A. Stable Rock is natural solid mineral matter that can be excavated with vertical sides and remain intact while exposed. It is usually identified by a …

2025年1月6日 · Understanding OSHA's Subpart P requirements for excavation slopes is crucial for workplace safety. 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 each soil classification.