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COLORADO DEPARTMENT OF HEALTH, Water Quality Conrrol Division
<br />Rationale -Page 9, Pennit No. CO-0043648
<br />Table III - 3 cont'd -Quality of Receiving Water
<br />Station AG-1.0, Above the Valley Leach Facility, Jane, 1987-February, 1995
<br />Parameter HSamples Min. Mar. Avg. S1d.Dev. Median 85th Pcntl
<br />Copper, Dissolved, rag/l 27 0.00 0.11 0.012 0.037
<br />Iron, TR, tag/l 21 0.0 52 4.0 11.1 0.9 2.5
<br />Iron, Dissolved rrtgJ! 27 0.00 48.00 0.43 1.1
<br />Lead, Dissolved, mg/[ 27 0.00 D.OI 0.0 0.0
<br />Manganese, TR, mg/1 21 0.0 12 7.3 8.7
<br />Manganese, Dissolved, mg/! 26 0.17 12 7.5 2.2 7.3 9.0
<br />Mercury, PD, mg/l 20 0.00 0.00 0.0 0.0
<br />Nickel, Dissolved, mg/l 27 0.00 0.11 0.07 0.09
<br />Selenium, Dissolved, mg/[ 27 0.00 D.00 0.0 0.0
<br />Silver, Dissolved, rag/I 26 0.00 0.018 0.0 0.0
<br />Zinc, Dissolved, mg/1 27 0.028 2.4 1.2 0.64 1.1 1.7
<br />- Potentially Dissolved TR -Total Recoverable WAD -
<br />Table III - 4 Quality of Receiving Water
<br />Station AGI.0, Outlet of 4-Inch Pipe, Below the Valley Leach Facility, April, 1995 -February, 1996
<br />Parameter llSamples Min. Max. Avg. Std Dev Median 85th Pcntl
<br />Discharge, gpm 9 10 40 16.4 8.8 13.2 IS
<br />Temp, °F 8 41.9 52.3 46.1 3.5 44.4 51.3
<br />pN, su 7 3.7 4.3 4.0 0.2 3.9 4.0
<br />Dissolved Oxygen, ntg/l 2 6.1 8.1 7.1
<br />Total Suspended Solids, mg/1 3 8.0 18 11.3
<br />Total Hardness, ntg/l as 9 400 750 565 117 600 640
<br />CaCO,
<br />Nitrate, mg/l as N 9 1.9 10 5.3 2.5 5.1 7.0
<br />Total Cyanide, mg/[ 9 0.006 0.140 0.100 0.100 0.027 0.120
<br />WAD Cyanide, mg/1 9 0.000 0.017 0.000 0.000 0.000 0.011
<br />Free Cyanide, mg/[ 9 0.000 0.000 0.000 0.000 0.000 0.000
<br />Aluminum, Dissolved, mg/l 9 45.00 68 56./ 6.8 56 61
<br />Arsenic, PD, mg/1 9 0.00 0.023 0.0 0.0 0.0 0.0
<br />Cadmium, Dissolved, mg/1 9 0.02 0.035 0.0 0.0 0.03 0.03
<br />Chromium, PD, mg/1 9 0.00 0.023 0.0 0.0 0.0 0.0
<br />Copper, Dissolved, n:g/1 9 0.05 0.4 0.3 0.1 0.29 0.36
<br />Iron, TR, mg/l 9 0.29 0.6 0.4 0.1 0.5 0.53
<br />Iron, Dissolved mg/l 9 0.13 0.54 0.37 0.16 0.36 0.51
<br />Lead, Dissolved, mg/1 9 0.00 D.00 0.00 0.0 0.0 0.0
<br />Manganese, TR, mg/1 - - - - - - -
<br />Manganese, Dissolved, mg/l 9 0.04 12.1 7.8 4.3 9.0 11.0
<br />Mercury, PD, mg/l 9 0.00 0.0 0.0 0.0 0.0 0.0
<br />Nickel, Dissolved, mg/! 9 0.00 0.11 0.1 0.0 0.1 0.1
<br />Selenium, Dissolved, mg/1 9 0.00 0.006 0.000 0.0 0.0 0.0
<br />Silver, Dissolved, ntg/1 9 0.00 0.0 0.0 0.0 0.0 0.0
<br />Zinc, Dissolved, m,e/t 9 1.5 2.6 2.2 0.3 2.2 2.5
<br />- Potentially Dissolved TR -Iota! Recoverable WAD -Weak Acid Dissociable
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