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• Table C~ Lower Dry Fork -Water Quality and Field Parameters Baseline Sample Dates Field Paremetera Unib Minimum Maximum Mean 6/23/98 7/2/96 6/29/96 9129/98 Flow c1s 1.02 10.45 6.2t 1.30 Contludivrty (Field) umhoslcm 700 260 360 960 pH (Fieltl) SU 6 6 8.5 6.6 6 5 Temperature 'C 760 14.5 72.6 124 Laboratory Parameter Units Alkalinity, total mg/L 205 Aluminum, dissolvetl mg/L < 0.03 Anions meq/L 9 Arsenic, total recoverable mg/L 0.002 Bicarbonate mg/L 116 324 220 167 Catlmium, dissolved mg/L < 0.003 Celoum, dissolved mg/L 87.9 87.9 67.9 59.3 Carbonate mg/L 16 Cation-Anion Balance % ~ Catans meq/L 8.3 Chloride mgUL 0 8 4 4 Condudiwty (Lab) umhoslcm 207 1920 755 555 Copper, dissolvetl mg/L 0.00 0 00 0 00 < 0 01 Fluodtle mg/L 0 2 Hardness mg/L 125 726 360 288 Hydroxide mg/L < 2 Iron, Dissolved mg/L 0 00 0.16 0.05 0.03 Iron, total mglL 0.02 64 00 5.58 0.36 Lead, dissolved mg/L 0.00 0.00 0.00 < 0.04 Magnesium, dissolved mglL 9.6 49.0 29 4 33.9 Manganese, tl~ssolved mglL 0.008 0.013 0011 0.007 Manganese, total mg/L 0 00 46.40 1.45 0.019 Mercury. total recoverable mg/L < 0.0002 Molybdenum, dissolved mg/L 0.00 0 00 0.00 < 0.01 Nitrate (as N), disSONed mg/L 0.16 Nitrata/Nitdte (as N) mg/L 0.10 0.30 0.17 0.16 Nitrite (es N), dissolved mglL < 0.07 pH (Lab) SU 6.9 9.0 6 2 6.5 Phosphate mg/L 0.05 Phosphate (Orlho). dissolved mglL 0.000 0.763 0.046 0.017 Potassium, dissolved mg/L 6.4 Selenium, total recoverable mg/L < 0 04 Sodium Absorbtion Ratio mg/L 0 71 1 A8 1.11 1 46 Sotlium, dissolved mg/L 69 0 69 0 69 0 56 3 Sullate mg/L 35 673 249 230 Total Dissolved Solids (Lab) mg/L 156 7386 561 500 Total Suspentletl Solids mg/L 1 1098 144 22 Zinc. dissolved mglL 0 00 0 00 0.00 c 0.01 Surtaca9e.xls ~ West Elk Mine s/t2/9g 1898 Annual Hydrology Report Wright Water Engineers