The gross receipts from the sale of tangible personal property incorporated or fabricated into any real property, structure, project, development or improvement under a contract specified in A.R.S. § 42-1310.16(B)(6) are exempt from tax. The gross receipts from the sale of tangible personal property used in soil remediation activities but not incorporated or fabricated into any real property, structure, project, development or improvement are taxable.
Ariz. Admin. Code § R15-5-152