Applicability of narrative and numerical criteria

(a) For purposes of permitting discharges for attainment of numerical criteria or establishing site specific criteria, streamflows of the greater of 1.0 cfs or 7Q2 shall be used to determine appropriate permit conditions unless otherwise provided in OAC 252:730 or OAC 252:740. (b) When numerical criteria do not apply, water column conditions including dissolved oxygen concentrations, organoleptic compounds, nutrients, and oil and grease shall be maintained to prevent nuisance conditions caused by man’s activities. (c) Narrative criteria listed in this Chapter shall be maintained at all times and apply to all surface waters of the state. 11 (d) If more than one narrative or numerical criteria is assigned to a stream, the most stringent shall be maintained.