OAR 340-040-0135: Method and Criteria for Establishment of Maximum Measurable Levels of Contaminants in Groundwater: Modification to the Maximum Measurable Level

(1) The Department shall follow its established schedule for periodic review of all of its rules to determine that all current maximum measurable levels duly adopted by the Commission remain appropriate. (2) If a maximum measurable level is based on a federal standard and that standard is duly modified by the authorized federal agency, the Department shall reevaluate the Commission’s adopted maximum measurable level in conjunction with the Department’s tri-annual review of water quality standards or before, if the Department considers it necessary to do so. The Department may, after that re-evaluation, either propose to take no action or propose a change to the maximum measurable level, pursuant to these rules. (3) The Department may, at any time pertinent scientifically valid information becomes available, propose a change to a maximum measurable level or propose a new maximum measurable level for any substance of concern or contaminant pursuant to the procedures set forth in these rules. (4) The Department may, at any time pertinent scientifically valid information on degradates or metabolites of a parent compound, or interactions thereof, becomes available, propose a change to an existing maximum measurable level or propose a new maximum measurable level for any substance of concern or contaminant pursuant to the procedures set forth in these rules.