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.Appendix G - Sump Shutdown Test Methods and Results 8 <br /> <br />Table 3. Calculation of Mixing Water Quality in Ralston Creek, 1999 <br />CONCENTRATION INPUT <br />Avg U concentration upstream (C„) 0.5 ppb <br />Avg U concentration downstream (Cd) 1.4 ppb <br />Avg U concentration in discharge (C,,) 1.7 ppb <br />FLOW INPUT <br />Discharge flow rate (Fv,,t) 200 gpm <br />Discharge flow rate (FH,t) 0.45 cfs <br />Ralston Creek flow rate (Ftotan) 5 cfs at mine <br />Ralston Creek flow rate (Ftota@ 2 cfs at Ralston Res. <br />MIXING RESULTS <br />Mixing concentration (based on 5cfs) 0.607 ppb <br />Mixing concentration (based on 2cfs) 0.767 ppb <br />Concentration increase (based on 5cfs) 0.107 ppb <br />Concentration increase (based on 2cfs) 0.267 ppb <br />NOTES: C„ based on average of stations SW-UP and SW-UC from 3/29/99 - 4/2/99 <br />• Cd based on average of stations SW-UP and SW-UC from 3/29/99 - 4/2/99 <br />C.,t based on average at SW-DIS001 from 3/29/99 - 4/2/99 <br />F,,,t is approximate average flow from water treatment plant during March (197 gpm) and April (228 gpm) 1999 <br />Ftotali is flow in Ralston Creek near mine, based on staff gage readings at SW-BPL from 3/29/99 - 4/2/99 <br />Frot12 is flow above Ralston Reservoir, based on Denver Water records 3/29/99 - 4/2/99 <br />• <br />4109B.071109 Whetstone Associates