Environmental

In Arizona, 'desert pavement' or 'hardpan desert floor' can affect construction because:

AIt is a protected geological feature that cannot be disturbed
BIt may indicate shallow bedrock, caliche, or compact soil conditions that affect excavation, drainage, and foundation design✓ Correct
CIt contains toxic minerals requiring remediation
DIt is an indicator of underground water

Explanation

Desert pavement and hardpan (caliche) in Arizona indicate compact, impermeable soil conditions that affect grading, excavation costs, drainage design, septic system viability, and foundation engineering requirements.

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