Type C soils can have an unconfined compressive strength of how many tsf or less?

Type C soils are classified as granular soils that are typically loose and water-saturated, making them the weakest of the soil types designated by OSHA. The unconfined compressive strength of Type C soils is defined as 0.5 tons per square foot (tsf) or less. This classification is critical for construction safety because it affects how excavation and other earth-moving operations are approached, particularly in terms of shoring and protective systems.

Understanding the properties of Type C soils is essential for maintaining safety on construction sites, as these soils are more prone to failure and can lead to cave-ins if not properly supported. As such, knowing the strength limitations helps construction professionals implement appropriate safety measures, mitigating risks associated with working in these types of soils.

The other options present higher strength values that exceed the established limit for Type C soils, which are not applicable based on the definitions in OSHA regulations. Thus, the correct answer reflects the key understanding needed for effective safety management in construction involving such soil classifications.