(1) Specific surface water quality standards, along with general provisions in ARM 17.30.635 through 17.30.637, 17.30.640, 17.30.641, 17.30.645, and 17.30.646, protect the beneficial water uses set forth in the water-use descriptions for the following classifications of water.

(2) Standards for Escherichia coli bacteria are based on a minimum of five samples obtained during separate 24-hour periods during any consecutive 30-day period analyzed by the most probable number or equivalent membrane filter methods.