2010-04-20_REVISION - M1977300 (8)

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Environmental Protection Plan, Schwartzwalder Mine 11-4 Table 11-3. Water Quality Standards for Ralston Creek Stream Segment 17b STREAM SEGMENT DESCRIPTION REGION: 3 BASIN: Clear Creek n Creek from the source to the inlet of Arvada Reservoir, f R l t i including Ralston Reservoir, and Upper Long Lake. a s o nstem o STREAM SEGMENT: 17b. Ma DESIGNATION: UP QUALIFIERS: Water + Fish, Organics CLASSIFICATIONS: Aq Life Cold 2, Recreation la, Water Supply, Agriculture - - NUMERIC STANDARDS _ Basis of calculated standards: low-flow average at SW-BPL, post sump shut-off u 06 s 7 . ., . PH = post sump shut-off low-flow average at SW-BPL °C , , T = 1.25 Hardness = 163 mg/L, low-flow average at SW-BPL, post sump shut-off Physical and Biological acute chronic mg/L D.O. * 6.0 0 mg/L * 7 . D.O. (sp) H* 6.5-9.0 S.U. p F. Coli* 200/100mL count E. Coli* 126/100mL count Inorganic Ammonia* 22.8 5.77 (elsp) mg/L as N total Chlorine* 0.019 0.011 mg/L total residual Cyanide* 0.005 mg/L free Sulfur* 0.002 mg/L Boron* 0.75 mg/L Nitrite* 0.05 mg/L Nitrate* 10 mg/L Chloride* 250 mg/L Sulfate (ws)* 250 mg/L Metals 750 87 ug/L total recoverable Aluminum * 50 --- ug/L total recoverable Arsenic, Cadmium(* 2.60111(tr) 0.61121 ug/L dissolved Chromium I1I* 50 --- ug/L total recoverable olved di Chromium VI* 16 11 ug/L 6 ug/L 13 ss dissolved . Copper* 21.3 300 ug/L * dissolved --- Iron, dissolved (ws) Iron, total 1000 ug/L total recoverable recoverable* --- 513 4.2714) ug/i * 109 dissolved . Lead Manganese* 3513 1941 ug/L dissolved Manganese (ws)* --- 50 ug/L /L 0 u dissolved total g Mercury, Total* 9 78.6 ug/L * 707 dissolved . Nickel Selenium* 0.0184 0.0046 ug/L dissolved Silver* 4.70151 0.74 ug/L dissolved Thallium --- 15.00 ug/L /L 1 u dissolved dissolved g Uranium 4116 257 40 pCi/L dissolved Uranium, at the intake 059 mg/L 0 dissolved . Uranium, at the intake 510 ug/L 4161 188 217 dissolved . . Zinc* Radionuclides 15 pCi/L 0 total . Americium 241 80 pCi/L dissolved Cesium 134 Plutonium 239 and pCi/L total 240 0.15 5 pCi/L total Radium 226 and 228 8 pCi/L total Strontium 90 60 pCi/L total Thorium 230 and 232 000 pCi/L 20 dissolved , Tritium - NOT -- _ Standards from Colorado Administrative Code 5CCR 1002-31 and 5CCR 1002-38 (effective July 1, 2007) Values in this table calculated using a water effect ratio (WER) of 1.0 unless otherwise noted *Required by site-specific standards (sp) - spawning standard (elsp) - early life stages present (ws) - water supply standard (tr) - trout standard (1) Cadmium KA = 1.136672 - On(hardness) x 0.041838) = 0.924 (2) Cadmium KC = 1.101672 - (ln(hardness) x 0.041839) = 0.889 (3) Lead KA = 1 A6203 - (In(hardness) x 0.145712) = 0.720 (4) Lead KC = 1.46203 - (In(hardness) x 0.145712) = 0.720 (5) Silver KA = 0.5 (6) Zinc KA = 0.978 (7) Zinc KC = 0.986 Equation for Ammonia acute standard is based on "salmonids present:" = 0.275/(1+101204"PH) + 39.0/(1+l OPH. 7.2D4) PH -"" 611' n < ' 15 2:! . P )) when T . ) + 39.01(1+lO Equation for Ammonia chronic standard is based on elsp = 2.85 x [0.0577/(1+IC nations for recreational water quality classifications in 2005. Under the new nomenclature, Category E is existing primary contact ew desi ti d g ng n op Note: Colorado began a recreation (formerly Category la). 4109C.100419 Whetstone Associates