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r\ <br />U <br /> <br />• <br />Colowyo Coal Company <br />COG-0045161 <br />Table 3 In-Stream Standards for Stream Se ment COLCLY03e <br />Ph sisal and Biolo ical Dissolved Ox en (DO) = 5 m <br /> H=6.5-9s.u. <br /> Fecal Colifotm = 325/ 100 ml <br /> Escherichia coti = 205/100 ml <br />Inor anic Ammonia, un-ionized, acute =TVS ,chronic = 0.06 m~ <br /> Chlorine acute = 0.019 m ,chronic = 0.011 m <br /> C anide, free (acute) = 0.005 m <br /> Sulfide (chronic) = 0.002 m <br /> Boron (chronic) = 0.75 m <br /> Nitrite = 0.05 m t <br /> Nitrate = IO m <br /> Chloride = 2S0 m <br /> Sulfate = W S <br />Metals Arsenic, total recoverable (acute) = 50 <br /> Cadmium, dissolved (acute and chronic) =TVS <br /> Chromium, total recoverable trivalent (acute) = 50 <br /> Chromium, dissolved hexavalent (acute and chronic) =TVS <br /> Co er, dissolved (acute and chronic) =TVS` <br /> Iron, dissolved (chronic) = WS <br /> Iron, total recoverable (chronic) = 1000 <br /> Lead, dissolved (acute and chronic) =TVS <br /> Man anese, dissolved (acute and chronic) =TVS <br /> Man anese, dissolved (chronic) = WS <br /> Merc ,rota] (chronic) =0.01 <br /> Nickel, dissolved (acute and chronic) =TVS` <br /> Seletuum, dissolved (acute and chronic) = TVSI <br /> Silver, dissolved (acute and chronic) =TVS` <br /> Zinc, dissolved (acute and chronic) =TVS <br />1 TVS =table value standards, z WS =water supply <br />Table 4 <br />Site-Specific Metals Water Quality Standards for the <br />Colowyo Mine Discharges to Segment 03e <br />Table Value Standards (TVS) Contained in the Colorado Department of Public Health and <br />Environment Water Qualit Control Commission Re ulation 31 <br />Calculated Using the Following Value for Hazdness as CaC03: 400mg/1 <br /> In-Stream Water <br />Parameter ual' Standard .Formula Used <br /> ACllt 19.12 /.l [1.13667-0.041841n(bazdness)][e(1.128(ln dues))-3. 867)] <br />admium, DiSSOIVed <br />Chronic <br />6.22 (t1.7852(lu(hardness))-2,715)] <br />[1.10167-0.041841n(hazdness)][e <br />rivalen[ Chromium, Trec. Acute 50 l.L Numeric standazds rovided, formula not a livable <br /> ACrtt 16 fl Numeric standazds rovided, formula not a livable <br />exavalent Chromium, Dissolved <br /> ChrOn1C 11 I.t Numeric standazds rovided, formula not a livable <br /> Acute 49.6 µ e(o.vazz(>aroa,daess>)-l.7aoa> <br />Copper, Dissolved <br />Chrolric <br />29.3 <br />µ I <ossa5(w(nardness))-t.7a2s) <br />e <br />WQA 4 Revised 1/24/2005 <br />