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COLORADO DEPARTMENT OF HEHL.TH, Wa[er Quality Control Division
<br />Rationale -Page 10, Pennit No. CO-0043648
<br />Table II! - 5 -- Quality of Receiving Water
<br />Station AG-1.5, Below the Valley Leach Facility, Jaly, 1990, thru April, 1995
<br />- No. 85th
<br />Parameter Samples Min. Max. Avl;. S[d.Dev. tYledian Pcntl
<br />Discharge, gpm 32 0.0 1!0 24.4
<br />Temp, °F 33 32.9 66.7 44.3
<br />pH, su 32 5.9 7.7 6.6 7.2
<br />Dissolved Oxygen, mg/l 24 6.2 10 7.7
<br />Total Suspended Solids, tag/1 32 0.0 550 32.5
<br />Total Hardness, mg/l as CaCO~ 33 390 2, 400 843
<br />Nitrate, mg/! as N 32 0.05 8.4 1.2 1.5 0.93 3.5
<br />Total Cyanide, mg/[ 38 0.00 0.93 0.086 0.11
<br />WAD Cyanide, ntg/l 38 0.00 0.37 0.035 0.078 0.009 0.021
<br />Free Cyanide, mg/! 38 0.00 0.3 0.00 0.00
<br />Aluminum, Dissolved, tag/1 36 0.00 4.0 0.9 1.0
<br />Arsenic, PD, mg/1 34 0.00 0.17 0.0 0.007
<br />Cadmium, Dissolved, mg/[ 36 0.00 0.0045 0.0001 0.0006
<br />Chromium, PD, mg/1 34 0.00 0.015 0.0 0.007
<br />Copper, Dissolved, mg/l 36 0.00 0.016 0.0 0.007
<br />Iron, TR, mg/1 34 0.02 16 0.07 0.66
<br />Lead, Dissolved, mg/1 36 0.00 0.00 0.0 0.0
<br />Manganese, TR, mg/l 35 0.11 90 0.3 2.3
<br />Mercury, PD, mg/[ 34 0.00 0.0038 0.0 0.0
<br />Nickel, Dissolved, mg/1 36 0.00 0.06 0.0 0.0
<br />Selenium, Dissolved, mg/l 36 0.00 0.00 0.0 0.0
<br />Silver, Dissolved, mg/l 36 0.00 0.0059 0.0 0.0
<br />Zinc, Dissolved, tag/l 36 0.008 0.44 0.03 0.038
<br />PD -Potentially Dissolved TR -Total Recoverable WAD -Weak Acid Dissociab[e
<br />Table III - 6 -- Quality of Receiving Water
<br />Station AG-1.5, Below the Valley Leach Facility, May, 1995, thru February, 1996
<br />... No. 85th
<br />Parameter . Samples Min. Max. Avg. Std.Dev. Median:.. Pcntl
<br />Discharge, gpm 11 0 126.5 38.2 39.1 21.6 45.6
<br />Temp, °F 10 35 61.2 47.3 9.2 44.8 55.3
<br />pH, su 7 5.3 6.4 5.8 0.38 5.8 6.0
<br />Dissolved Oxygen, mgft 6 5.4 I1.0 7.5 1.7 7.0 7.5
<br />Total Suspended Solids, mg/l 11 6 90 30.2 23.5 26.0 38.0
<br />Total Hardness, mg/l as CaCO~ II 390 1100 795 234 860 980
<br />Nitrate, mg/1 as N 11 1.6 27 11.7 8.9 10.0 22.0
<br />Tora! Cyanide, rag/l 12 0.031 0.94 0.272 0.303 0.11 0.45
<br />WAD Cyanide, mg/l 12 0.008 0.27 0.069 0.078 0.04 0.13
<br />Free Cyanide, mR/l 11 0.00 0.23 0.024 0.066 0.0 0.0
<br />WAD -Weak Acid Dissociab[e
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