Backfill depth for trenches that are overexcavated and require backfilling below the level of the pipe is limited to how many inches per layer?

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Prepare for the CR-21 Landscapes and Irrigation Test. Utilize flashcards and multiple-choice questions featuring hints and explanations. Get exam-ready!

Multiple Choice

Backfill depth for trenches that are overexcavated and require backfilling below the level of the pipe is limited to how many inches per layer?

Explanation:
When backfilling under the pipe after overexcavation, you must install the fill in thin lifts to allow proper compaction around the pipe. The maximum per layer is six inches. This limit helps ensure uniform support and prevents movement or damage to the pipe during compaction. Lifting more than six inches at a time can trap voids and cause uneven settlement or pipe displacement, while smaller lifts (like three inches) are acceptable but the key limit is six inches. Lifts of twelve or eighteen inches are too thick for reliable compaction beneath the pipe.

When backfilling under the pipe after overexcavation, you must install the fill in thin lifts to allow proper compaction around the pipe. The maximum per layer is six inches. This limit helps ensure uniform support and prevents movement or damage to the pipe during compaction. Lifting more than six inches at a time can trap voids and cause uneven settlement or pipe displacement, while smaller lifts (like three inches) are acceptable but the key limit is six inches. Lifts of twelve or eighteen inches are too thick for reliable compaction beneath the pipe.

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