Do not exceed individual plan depth thickness by more than how many inches?

• A. 1
• B. 2
• C. 3
• D. 4

Answer: (D)

The question tests tolerance in earthwork grading — you must keep the actual depth close to what the plan calls for. Limiting the deviation to four inches provides a practical balance: it accounts for measurement and equipment variances while still ensuring the final surface matches the design enough for proper drainage, compaction, and the bonding of subsequent lifts. If the depth goes beyond the plan by more than four inches, it creates over-excavation or an overly thick lift, which can lead to drainage problems, settlement, or difficulties achieving the required cross-section. In practice, when the depth exceeds this limit, adjustments are made to bring it back into tolerance by removing excess material or adding material as needed.