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West Elk Mine <br />CJ <br /> <br />Table 59 <br />Effects of Wastewater Treatment Plant Discharge on the North Fork <br /> <br />Year Discharge (MGD) low Flow <br />North Fork Discharge <br />Fran W WiP Annual Yield <br />of North Fork <br /> Average Max. Daily (MGD) (acre feet) (acre feet) <br />1983 0.0017 0.0035 23.27 1.93 264,913 <br />1984 0.0056 0.0090 18.10 6.21 303 414 <br />1985 0.0052 0.0075 36.84 5.72 269 996 <br />1966 0.0048 0.0102 51.71 5.38 291,290 <br />1967 0.0033 0.0051 31.67 3.70 192,500 <br />1988 0.0036 0.0071 34.96 4.03 113,200 <br />Table 60 <br />Wastewater Discharge Impacts on North Fork Gunnison River During Low Flow Conditions <br /> 7-Day, 10.Yr. <br />Low Flow 1-Day, 10.Yr. <br />Low Flow <br /> Stream Flow CFS 32.5 25 <br /> Dilution Ratios <br />Effluent Discha a 10,000 <br />2100 <br />1620 <br />Water Quali Parameter <br />BOD Effluent 30 30 <br />(mg/L) Incremental Change 0.014 0.018 <br />TSS Effluent 30 30 <br />(mg/L) Incremental Change 0.014 0.018 <br /> Background 137 137 <br />NH,-N Effluent 1 1 <br />(mg/L) incremental Change .0001 .0001 <br /> Background .45 .45 <br /> Standard 0.905 0.905 <br />NOa-N Effluent 29 29 <br />(mg/L) Incremental Change 0.014 0.018 <br /> Background 0.20 0.20 <br /> Standard 10.0 10.0 <br />C1z EtHuent 0.5 0.5 <br />(mg/L) Incremental Change .0002 .0003 <br /> Standard .003 .003 <br />Fecal Colifonn Effluent 6000 6000 <br />Colonies/100m1 Incremental Change 3 4 <br /> Background 18.8 18.8 <br /> Standard 2000 2000 <br />1 NPDES Permit Limd <br />2 Standard for total ammonia, dedved from the mean annual pH value (7.8) and the maximum reponed temperature value (66°F or <br />19°C value which results in an instream unionized ammonia concentration of 0.02 m Las N. <br />Following upgrades to the WWTP in 1997, the plant capacity increased to 20,000 gpd (0.02 <br />. MGD) The maximum projected discharge rate from the WWTP is 0.04 MGD. This <br />2.05-203 Revised November 1004 PR70 <br />