Gas Supersaturation

01. Applicability of Gas Supersaturation Standard. The Director has the following authority: (3-31-22) a. To specify the applicability of the gas supersaturation standard with respect to excess stream flow conditions; and (3-31-22) b. To direct that all known and reasonable measures be taken to assure protection of the fishery resource; and (3-31-22) c. To require that operational procedures or project modifications proposed for compliance for dissolved gas criterion do not contribute to increased mortalities to juvenile migrants or impose serious delays to adult migrant fishes. (3-31-22) 02. Interstate Agreements. In making determinations as to the applicability of gas supersaturation standards, the Director can seek and enter into agreements with adjoining state environmental regulatory agencies. (3-31-22) 03. Gas Supersaturation Control Program. Owners or operators of proposed water impoundment facilities subject to excessive spilling which can result in supersaturated water conditions must submit to the Department for approval a program for the detection and control of gas supersaturation. The program must include, but is not limited to: (3-31-22) 17040207 Blackfoot Chronic Egg-Ovary (mg/kg dw) Fish Tissue (mg/kg dw) Egg-Ovary Whole-Body Muscle 19.01 9.52 13.12 mg/kg dw – milligrams per kilogram dry weight, µg/L – micrograms per liter 1. Egg-ovary supersedes any whole-body, muscle, or water column element when fish egg-ovary concentrations are measured. Single measurement of an average or composite sample of at least five (5) individuals of the same species. Not to be exceeded; DEQ will evaluate all representative egg-ovary data to determine compliance with this criterion element. 2. Fish whole-body or muscle tissue supersedes water column element when both fish tissue and water concen- trations are measured. Single measurement of an average or composite sample of at least five (5) individuals of the same species where the smallest individual is no less than seventy-five percent (75%) of the total length (size) of the largest individual. Not to be exceeded; DEQ will evaluate all representative whole-body or muscle data to determine compliance with this criterion element. HUC Subbasin HUC Subbasin IDAHO ADMINISTRATIVE CODE IDAPA 58.01.02 Department of Environmental Quality Water Quality Standards Section 350 Page 177 a. Time schedules for construction or installation of supersaturation control features and devices; and (3-31-22) b. When required by the Department, a monitoring and reporting system insuring that supersaturated conditions are detected and reported to the Department. (3-31-22) 301. -- 349. (RESERVED)