US lawMontanaRegulationsTitle 17 — ENVIRONMENTAL QUALITYChapter 17.30 — WATER QUALITYSubchapter 17.30.6 — Surface Water Quality Standards and Procedures17.30.640ARM 17.30.640ARM 17.30.640. MIXING ZONERepealedLast amended: 1996Length: 1 wordsOfficial source Cite as Mont. Admin. R. 17.30.640(REPEALED)PreviousARM 17.30.638NextARM 17.30.641