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• PART I Page lc of 19 Permit No. CO-0000221 A. TERMS AND CONDITIONS 1. Effluent Limitations e) Discharge point 009 Beginning immediately and lasting through May 31, 1997, the permittee is authorized to discharge within the limitations specified below, from the following outfall aerial number (see Figure 2): 009, sediment pond outfall to an unnamed tributary to Sage Creek Parameter 30-dav avg. a/ Daily Max. c/ Flow, MGD Report NA Total Suspended Solids, mg/1 35 70 Total Iron, mg/1 3.0 6.0 Total Dissolved Solids, mg/1 NA Report The pH range shall remain between 6.5 and 9.0 s.u. c/ Oil and grease shall not exceed 10 mg/1 c/ in any grab sample nor shall there be a visible sheen f/. f) Additional limits - discharge point 009 • Any discharge or increase in the volume of a discharge caused by precipitation within any 24-hour period less than or equal to the 10-year. 24-hour orecinitation event (or snowmelt of equivalent volume) may comply with the following limitations subject to burden of proof requirements described in Part I.A.2. Parameter Daily Maximum c/ Flow, MGD Aeport Settleable Solids, ml/1 j/ 0.5 Total Dissolved Solids, mg/1 Report pH (standard units) shall remain between 6.5 and 9.0 c/. Oil and grease shall not exceed 10 mg/1 c/ in any grab sample nor shall there be a visible sheen f/. Any discharge or increase in volume of a discharge caused by precipitation within any 24-hour period greater than the 10-year, 24-hour event (or series of storms or snowmelt of equivalent volume) ~ comply with the following limitations subject to burden of proof requirements described in Part I.A.2. Flow, MGD - monitoring only per Part I.H.1. Total Dissolved Solids - monitoring only per Part I.B.1. pH shall remain between 6.5 and 9.0 s.u. c/. Oil and grease shall not exceed 10 mg/1 c% in any grab sample nor shall there be a visible sheen f/. • Amended JUN ~1 4 1996 Effective ~11~~~_