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Middle Sylvester Gulch Surface Water Quality and Field Parameters • • ,r1 u Mountain Coal West EIk Mine Monitoring Location M. Sylvester Gulch Baseline 2003 Water Year Descri lion Units Minimum Maximum Mean 4/12/2003 5/5/2003 Lab Du licate 8/2/2003 9/28/2003 Field Parameters Flow cfs o.2z o.1 o.oa Elecldcal Conduclivi umhos/cm 1196 1026 3030 H SU 7.72 8.11 8.92 Tem ralure oC 49.4 61.] a9 Comment Laborato Parameters Name of Certifed Lab ACZ ACZ ACZ ACZ Lab Reference # L41121-03 L41121-04 L41471-03 L43143-07 Sam le Data 5/7Y1003 5/7/2003 6/2/2003 9/28/2003 Lab Test Date 5/7-5/17 5nSH5 s/5-6/12 9/30-10/17 Sam led e Alkalini Total CaCO3 m /I Aluminum, tlissolved m /I Anions me /I Arsenic, dissolved m /I Arsenic, total m /I Bicarbonate m /I 448 310 Boron, dissolvetl m /I Cadmium, dissolved m /l Calcium, dissolved m /I Carbonate m /I Cation-Anion Balance m /I Cations me I Chlodde m /1 3 10 5 COntlUC11Vl umhos/Cm 480 800 608 721 ]10 936 Co er, dissolved m /I Hardness m I 159 234 194 H droxide m /I Iron, diSS0lved m /I 0.4 0.1 0.2 0.16 0.02 0.09 Iran, total m /I 0.05 10.5 2 88.6 72 2.38 0.94 Lead, tlissolved m /I Lead, total m /I Ma nesium, dissolved m /I Man ane6e, dissolved m /I 0.006 O.OOfi -0.005 -0.005 Man anese, total m /I 0.56 0.05 0.78 0.775 0.049 0.017 Mercu ,total m /I Mal tldenum, dissolved m /I Nitmte as N ,tlissolved m /I Nitrate/NiMte as N m /I 0.08 0.02 Nitrite as N ,dissolved m /I H SU ].35 8.70 8.08 8.1 8.1 8.8 Phos hate m /I Pnos horns Ortho ,dissolved m /I 0.875 0.11 Potassium, dissolved m /I Selenium, total m /I Sodium Abso tien Ratio SAR talc. 2.29 3.02 2.7 Sodium, dissolved m /I Sulfate m I 28.2 80 48.1 TDS Ratio talc. TOS Calc. m I TDS m /I 3.68 584 381 440 440 580 1620 TSS m /I 4.2 5]40 479 1940 1880 40 6 Zinc, dissolved m /I ACZ Labs, Steamboat S nn s, Colo2do ' Standard is for reference u oses onl NA -nota licable NM-not measured NR-not re orted Cd West Elk Mine 2003 Annual Hytlrology Raport HydroGeo, Inc.