ARM 17.30.653. E-2 CLASSIFICATION STANDARDS

(1) Waters classified E-2 are to be maintained suitable for agricultural purposes, secondary contact recreation, and wildlife. Because of habitat, low flow, hydro-geomorphic and other physical conditions these waters are marginally suitable for aquatic life. (2) No person may violate the following specific water quality standards for waters classified E-2: (a) the aquatic life standards for priority pollutants listed in DEQ-7; (b) the aquatic life standards for ammonia and other non-priority pollutants listed in DEQ-7, unless those standards are modified or removed based upon a use attainability analysis developed for a specific water body; (c) the designated uses of a receiving water body under a different classification must be fully maintained; (d) the geometric mean number of Escherichia coli bacteria may not exceed 630 colony forming units per 100 milliliters and 10% of the samples may not exceed 1,260 colony forming units per 100 milliliters during any 30-day period.