when drinking water is analyzed to determine if the quality meets ther standards of the U.S. Environmental Protection Agency each containing 10 mL, 5 replicate tubes each containing 20 mL or a single bottle containing a 100 mL sample portion. When examining drinking water by the fermentation technique, process all tubes or bottles demonstrating growth with or without a positive acid or gas reaction to the confirmed phase. Apply the completed test to not less than 10% of all coliform positive sample and per quarter. Obtain at least one positive sample per quarter. A positive EC broth or a positive EC MUG broth test result is considered an alternative to the positive completed test phase.