R18-11-108.01. Narrative Biological Criteria for Wadeable, Perennial Streams

A. The narrative biological criteria in this Section apply to a wadeable, perennial stream with either an aquatic and wildlife (cold water) or an aquatic and wildlife (warm water) designated use. B. The biological standard in R18-11-108(E) is met when a bioassessment result, as measured by the Arizona Index of Biological Integrity (IBI), for cold or warm water is: 1. Greater than or equal to the 25th percentile of reference condition, or 2. Greater than the 10th percentile of reference condition and less than the 25th percentile of reference condition and a verification bioassessment result is greater than or equal to the 25th percentile of reference condition. C. Arizona Index of Biological Integrity (IBI) scores: Index of Biological Integrity Scores A&Wc A&Ww Greater than or equal to the 25th percentile of reference condition Bioassessment Result 52 50 Greater than the 10th and less than the 25th percentile of reference condition 46 - 51 40 - 49