Master OSHA excavation safety: know soil types and slopes, call 811 before any digging, install proper shoring, dewater correctly, and ensure compaction testing. Trench safety is life-or-death.
Key Takeaways
Call 811 at least 2-3 business days before ANY excavation; utility locating is mandatory and legally required.
Why This Matters on the Exam
Underground plumbing is dangerous work. Trench collapses kill people. The California Plumbing Code incorporates OSHA safety requirements, and the C-36 exam tests whether you know how to work safely below grade. Trench safety, soil classification, shoring, dewatering, and utility locating—these aren't suggestions. They're life-and-death requirements. Beyond the exam, understanding these rules protects your crew from serious injury or death. I've been in this trade 30+ years, and I've never seen a contractor succeed long-term by cutting corners on trench safety.
What You Must Know
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