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Privileged and Confidential—Attorney Client Communication Geosyntec <br /> consultants <br /> 1.3 Treated Water Discharge Limits <br /> An important aspect to the design of passive treatment systems is to target water quality <br /> limits that govern discharges from the Mine(Ford, 2003). Effluent water quality limits <br /> are specified in OSMI's CDPS Permit CO-0000003,Modification 4, and are <br /> summarized in Table 2. <br /> Table 2:Water Quality Discharge Limits* <br /> Effluent Limitations Maximum Concentrations <br /> Effluent Parameter <br /> 30-Day Average Daily Maximum <br /> pH 6.5-9 <br /> Total Suspended Solids(TSS),effluent 20 30 <br /> (mom)** <br /> Total Dissolved Solids(TDS)(mg/L) Report NA <br /> Arsenic,Total Recoverable(tg/L) Report NA <br /> Cd,Total(p.g/L) 50 100 <br /> Cd,Potentially Dissolved(pg/L) 0.74 2.2 <br /> Cr+3,Total Recoverable(µg/L) Report NA <br /> Cu,Total(µg/L) 150 300 <br /> Cu,Potentially Dissolved(p.g/L) 12.5 Report <br /> CN,WAD(p.g/L) NA 5.6 <br /> Fe,Total Recoverable(µg/L) 1,276 NA <br /> Pb,Total (.tg/L) 300 600 <br /> Pb,Potentially Dissolved(µg/L) 2.6 100 <br /> Mn,Potentially Dissolved(Etg/L) 2,067 4,127 <br /> Hg,Tot(low level)(p.g/L) 0.011 NA <br /> Hg,Total (µg/L) 1 2 <br /> Ag,Potentially Dissolved(.tg/L) 0.08 Report <br /> Zn,Total(p.g/L) 750 1,500 <br /> Zn,Potentially Dissolved(µg/L) 126 166 <br /> WET,chronic—Static Renewal 7 Day NOEC or IC25 >IWC <br /> Chronic Pimephales promelas *** — <br /> WET,chronic—Static Renewal 7 Day <br /> Chronic CeI7oclahhnra *** NOEC or IC25>IWC <br /> *Source. CDPS Permit CO-0000003,Permit Modification 4 <br /> l reatabilih I,,sting Report 4 December 11,2018 <br />