Ariz. Admin. Code § 18-16-401
The following definitions shall apply in this Article, unless the context otherwise requires:
"Alternative remedy" means a combination of remedial strategies and remedial measures different from the reference remedy that is capable of achieving remedial objectives. The alternative remedies are compared with the reference remedy for purposes of selecting a proposed remedy at the conclusion of the feasibility study.
"Comparison criteria" means risk, cost, benefit, and practicability, as those terms are described in R18-16-407(H)(3). "Community involvement area" has the same meaning as defined in A.R.S. § 49-281(3).
"Contaminant of concern" means a hazardous substance that results from a release and that has been identified by the Department as the subject of remedial action at a site.
"Hazardous substance" has the same meaning as in A.R.S. § 49-281(8).
"Nonrecoverable costs" has the same meaning as in A.R.S. § 49-281(9).
"Proposed remedy" means a combination of remedial strategies and remedial measures which, as a whole, is capable of achieving remedial objectives that is identified at the conclusion of a feasibility study and is incorporated in the proposed remedial action plan.
"Reference remedy" means a combination of remedial strategies and remedial measures which, as a whole, is capable of achieving remedial objectives. The reference remedy is compared with the alternative remedies for purposes of selecting a proposed remedy at the conclusion of the feasibility study.
"Remedial measure" means a specific action taken in conjunction with remedial strategies as part of the remedy to achieve one or more of the remedial objectives. For example, remedial measures may include well replacement, well modification, water treatment, provision of replacement water supplies, and engineering controls.
"Remedial objective" means the goal, as established through the process in R18-16-406, to be achieved by a remedy selected under this Article. Remedial objectives include the following elements:
Protecting against the loss or impairment of identified uses of land and waters of the state;
Restoring, replacing, or otherwise providing for identified uses of land and waters of the state;
Time-frames when action is needed to protect against or provide for the impairment or loss of the use; and
The projected duration of the action needed to protect or provide for the use.
"Remedial strategy" means one or a combination of the six general approaches described in R18-16-407(F) which may be employed in conjunction with remedial measures as part of the remedy to achieve the remedial objectives.
"Remedy" has the same meaning as in A.R.S. § 49-281(13).
"Site-specific human health risk assessment" means a scientific evaluation of the probability of an adverse effect to human health from exposure to specific types and concentrations of contaminants at or from a site. A site-specific human health risk assessment contains four components: identification of potential contaminants; an exposure assessment; a toxicity assessment; and a risk characterization.
"Site registry" or "registry" means the registry of scored sites maintained by the Department under A.R.S. § 49-287.01(D).
"Vadose zone" has the same meaning as in A.R.S. § 49-201.
"Water provider" means the owner or operator of a public water system, an agricultural improvement district, or an irrigation and water conservation district.
Ariz. Admin. Code § R18-16-401