NGA 71 Operator Excavating And Backfilling In The Vicinity Of A Pipeline (Critical AOC) Practice Test

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If part of the pavement where the excavation is being performed becomes undetermined, what action must be taken for that portion?

Removed Shoring must be installed Removed or shoring will need to be installed Left in place

Correct Answer:

Removed or shoring will need to be installed

Explanation:

When the pavement area over an excavation has undetermined conditions, you must take protective action to prevent failure. Since the under-surface condition isn’t known, the segment must be addressed by either removing the pavement to expose the area and provide proper support, or by installing shoring to support the pavement and keep it from collapsing into the excavation. Leaving the pavement as-is is not acceptable because unknown conditions could lead to a hazard for workers and the pipeline. Removal is chosen when access and inspection are needed to ensure stability, while shoring is used when it’s feasible to preserve the pavement with temporary support. In short, that portion must be either removed or shored.

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