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Schwartzwalder Mine -Hydrologic Evaluation of Mine Closure and Reclamation 47 <br />Table 21. Water Quality Standards for Ralston Creek Stream Segment 17b <br />STREAM SEGMENT DESCRIPTION <br />REGION: 3 <br />BASIN: Clear Creek <br />STREAM SEGMENT: 176. Mainstem of Ralston Creek from the source to the inlet of Arvada Reservoir, including Ralston Reservoir, and Upper Long <br />Lake. <br />DESIGNATION: UP <br />QUALIFIERS: Water+Fish, Organics <br />CLASSIFICATIONS: Aq Life Cold 2, Recreation la, Water Supply, Agriculture <br />NUMERIC STANDARDS <br />Basis of calculated standards: <br />= <br />7 <br />06 <br />lo <br />s <br />u <br />w-flow average at S W-BPL, post sump shut-off <br />PII <br />T = . <br />1.25 . <br />., <br />°C, low-flow average at S W-BPL, post sump shut-off <br />Hazdness = 163 mg/L, low-flow average at S W-BPL, post sump shut-off <br />Physical and Biological acute chronic <br />D.O. • 6.0 mg/L <br />D.O. (sp)* 7.0 mBq- <br />py* 6.5 - 9.0 S.U. <br />F. Coli* 200/IOOmL count <br />E. Coli* 126/100mL count <br />Inorganic <br />Ammonia* <br />22.8 <br />5.77 (elsp) <br />mg/L as N <br />total <br />Chlorine* 0.019 0.011 mg/L total residual <br />Cyanide* 0.005 mg/L free <br />Sulfurs 0.002 m8fl- <br />Boron* 0.75 mSfl- <br />Nitrite" 0.05 mg/L <br />Nitrate* 10 mg/L, <br />Chloride* 250 m8q- <br />Sulfate (ws)* 250 mBfl- <br />Metals <br />750 <br />87 <br />ug/L <br />total recoverable <br />Aluminum <br />* 50 --- ug/L total recoverable <br />Arsenic, <br />Cadmitun(* 2.60111(tr) 0.61121 ug/L dissolved <br />Chromium lll* 50 --- ug/L total recoverable <br />Chromium VI* 16 11 ug/L dissolved <br />Copper* 21.3 13.6 ug/L dissolved <br /> <br />dissolved (ws)* <br />Iron <br />--- <br />300 g/L <br />° dissolved <br />, <br />total recoverable' <br />Iron <br />--- <br />1000 g~ <br />u total recoverable <br />, <br />Lead* 109.5['1 4.27131 ug/L dissolved <br />• <br />Manganese 3513 1941 ug/L dissolved <br /> <br />Manganese (ws)* <br />--- <br />50 <br />ugh dissolved <br /> <br />Mercury, Total* <br />--- <br />0 <br />78 <br />6 <br />ug/L <br />ug/L total <br /> <br />dissolved <br />Nickel* <br />Selenium* 707.9 <br />0.0184 . <br />0.0046 ug/L dissolved <br />Silver* 4.70[51 0.74 ug/L dissolved <br />Thallium ___ 15.00 ug/L dissolved <br />Uranium 4116 2571 ug/L dissolved <br />at the intake <br />Uranium 40 pCi/L dissolved <br />, <br />at the intake <br />Uranium 0.059 mg/L dissolved <br />, <br />Zinc" 217.4[61 188.511 ug/L dissolved <br />Radionuclides <br />l5 <br />0 <br />pCi/L <br />total <br />Americium 241 . <br />80 pCi/L dissolved <br />Cesium 134 <br />Plutonium 239 and 240 0.15 pCi/L total <br />Radium 226 and 228 5 PCi2 total <br />Strontium 90 8 pCi/L total <br />Thorium 230 and 232 60 pCi/L total <br />Tritium 20,000 pCi/L dissolved <br />NOTES: <br />Standards from Colorado Administrative Code SCCR 1002-31 and SCCR 1002-38 (effective July 1, 2007) <br />Values in this table calculated using a water effect ratio (WER) of 1.0 unless otherwise noted <br />"Required by site-specific standards <br />(sp) -spawning standard <br />(elsp) -early life stages present <br />(ws) -water supply standard <br />(tr) -trout standard <br />(I) Cadmium KA = 1.136672 - (In(hardness) x 0.041838) = 0.924 <br />(2) Cadmium KC = 1.101672 - (In(hardnws) x 0.041839) = 0.889 <br />(3) Lead KA = 1.46203 - (In(hardness) x 0.145712) = 0.720 <br />(4) Lead KC = 1.46203 - (In(hardness) x 0.145712) = 0.720 <br />(5) Silver KA = 0.5 <br />(6) Zinc KA = 0.978 <br />(7) Zinc KC = 0.986 <br />Equation for Ammonia acute standard is based on "salmonids present:" = 0.275/(1+10'303' °u)+39.0/(1+10'u"''20J) <br />Equation for Ammonia chronic standard is based on elsp = 2.85 x [0.0577/(I+10'~Oaa'°u) +39.0/(1+10°n"'688)] when T < 22.15 <br />4109B.071116 Whetstone Associates <br />