R18-9-A205. Alert Levels, Discharge Limitations, and AQLs

A. Alert levels. 1. If the Department prescribes an alert level in an individual permit, the Department shall base the alert level on the site-specific conditions described by the applicant in the application submitted under R18-9-A201(A)(2) or other information available to the Department. 2. The Department may specify an alert level based on a pollutant that indicates the potential appearance of another pollutant. 3. The Department may specify the measurement of an alert level at a location appropriate for the discharge activity, considering the physical, chemical, and biological characteristics of the discharge, the particular treatment process, and the site-specific conditions. B. Discharge limitations. If the Department prescribes discharge limitations in an individual permit, the Department shall base the discharge limitations on the considerations described in A.R.S. § 49-243. C. AQLs. The Department may prescribe an AQL in an individual permit to ensure that the facility continues to meet the criteria under A.R.S. § 49-243(B)(2) or (3). 1. If the concentration of a pollutant in the aquifer does not exceed the Aquifer Water Quality Standard, the Department shall set the AQL at the Aquifer Water Quality Standard. 2. If the concentration of a pollutant in the aquifer exceeds the Aquifer Water Quality Standard, the Department shall set the AQL higher than the Aquifer Water Quality Standard.