A master plumber is supervising a crew excavating a 7-foot deep trench in what has been identified as Type C soil. The trench walls are vertical (unsloped). According to OSHA standards (29 CFR 1926 Subpart P), what is the minimum requirement before a worker can enter this trench?
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A
A competent person must visually inspect the trench every hour.
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B
The spoil pile must be placed at least 1 foot from the edge.
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C
A protective system, such as shoring or a trench box, must be installed.
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D
Workers must wear hard hats and have a ladder within 50 feet.