(1) Waters classified E-4 are to be maintained suitable for aquatic life, agricultural purposes, secondary contact recreation, and wildlife.

(2) No person may violate the following specific water quality standards for waters classified E-4:

(a) the acute and chronic aquatic life standards in DEQ-7 apply;

(b) the designated uses of a receiving water body under a different classification must be fully maintained;

(c) 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.