Environmental
In Arizona, naturally occurring Caliche in the soil is relevant to real estate because:
AIt is a toxic substance requiring disclosure
BIt is a hardpan layer that can affect drainage, foundation design, and landscaping✓ Correct
CIt requires remediation before construction
DIt is a protected geological feature
Explanation
Caliche is a naturally occurring hardpan calcium carbonate layer found in Arizona soils. It affects drainage (water cannot percolate through), septic system design, foundation construction, and landscaping, making it relevant to site development.
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