Frequently Asked Questions
OSHA soil types under 29 CFR 1926 Subpart P Appendix A are Stable Rock and Types A, B and C, by falling stability. Type A is cohesive soil with 1.5 tsf or more unconfined compressive strength, Type C is 0.5 tsf or less, granular or submerged, with Type B between. State plans can differ.
Green spray on construction dirt is usually hydromulch seeding, a slurry of grass seed and wood fiber mulch dyed green so crews can see coverage, which protects bare soil from erosion. White or gray coatings are often tackifiers or soil stabilizers for dust and erosion control, or lime spread to dry and stabilize wet clay.
Piles of dirt at construction sites are called stockpiles, and soil dug from a trench or foundation and left beside it is called spoil. OSHA requires excavated material to sit at least 2 feet back from an excavation's edge, or behind retaining devices. Stripped topsoil is often stockpiled separately for reuse.
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