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Colowyo Coal Company <br /> <br />COG-0045161 <br />Table 6 <br />Sutnmar of Dischar es From the Colow o Coal Com an <br />Outfall Number Effluent Source Desi Ca acit (m d/cfs) <br />Dischaz es to Wilson Creek <br />003 Storm runoff, coal haulin facili wash water 1.68 / 2.60 <br />005 Storm runoff, auxili coal stora e azea 2.90 / 4,50 <br />006 Storm runoff, tunnel wash water 0.71 / 1.10 <br /> Total 5.29 / 8.2 <br />Dischaz es to Ta for Creek <br />002 Storm runoff, otential vehicle wash water 3.49 / 5.41 <br />008 Storm runoff, natural springs, potential pumped storm <br />runoff, o[ential underdrain water 9.20114.26 <br /> <br />010 Storm runoff, potential pumped storm runoff, potential <br />ground water, potential future spoil spring and associated <br />toe drain water <br />9,17 / 14.21 <br /> Total 21.86 / 33.9 <br />Dischar es to Good S rin Creek <br />001 Storm runoff, ground water 4.52 / 7.01 <br />004 Storm runoff, o[ential um ed storm runoff 4.65 / 7.21 <br />007 Storm runoff, um ed storm runoff 6.72 / 10.42 <br />009 Stotm runoff, otential um ed storm runoff 4.52 / 7.01 <br /> Total 20.41 / 31.7 <br />Assessment of Assimilative Capacity: <br />Parameters of concern were individually evaluated for assimilative capacity. The parameters are <br />listed above, Mass balance calculations were used to determine the assimilative capacity. The <br />instream flow was determined from the annual low flow calculation of the stream and the effluent <br />flow is the design capacity of each individual outfall. The water quality of the discharges is <br />regulated by the water quality standazds of the receiving segment. Since the low flow (Qt) at all <br />discharge points is zero, the Water Quality Based Effluent Limit (Mz) is equal to the stream standard <br />(M3). The assimilative capacity for each parameter is shown below based on the water quality <br />standards for the segment. The data used and the resulting calculations of the assimilative capacity <br />concentration, M2, aze shown in Table 7, Water Quality Based Effluent Limits - COLCLY03e. <br />r~ <br />L <br />Table 7 <br />Water Quality Based Effluent Limits - COLCLY03e <br />(AII azameters aze dissolved unless noted) <br />Parameter Ql (cfs) QZ (cfs) Q3 (cfs) Mt (µ ) M3 (µ ) MZ (µ ) <br />Arsenic (acute) 0 See Table Same as 0 50(Trec) 50(Trec) <br />Cadmium (chronic) 0 6 for Qp at zero 0 6.2 6.2 <br />Cadmium (acute) p effluent low flow 0 19.1 19.1 <br />Chromium III (chronic) p dischazge conditions. 0 231 231 <br />Chromium III (acute) 0 at each 0 1773 1773 <br />Chromium VI (chronic) 0 outfall. 0 11 11 <br />Chromium VI (acute) 0 0 16 16 <br />Copper (chronic) 0 0 29.3 29.3 <br />Copper (acute) 0 0 49.6 49.6 <br />WQA <br />8 Revised 1/24/2005 <br />