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• Table C-16 East Gulch, East of Horse Gulch -Water Quality and Field Parameters Baseline Sample Dates Field Parameters Unib Minimum Maximum Mean 5/31/98 6/23/98 9/25/98 Flow gpm 22.5 Z6 25 1 86 Contluctwily (Field) umhos/cm 260 480 402 360 410 460 pH (Fieltl) SU 7.7 84 B.0 8.1 79 7.8 Temperature 'C 4.8 14 8 10.5 14.5 11 3 9.0 Laboratory Parameters Unib Alkalinity, total mg/L 135 245 202 204 Aluminum, di55olvetl mg/L 0.03 0.07 0.03 0.03 Anions meg/L 4.9 4.9 4.9 4.9 Arsenic, tobl recoverable mg/L 0.000 0 000 0.000 < 0.001 Biwrbonale mg/L 135 245 202 204 Cadmium, dissolved mg/L 0 000 0.000 0 000 < 0 003 Calcium. dissolved mg/L 26.8 53.6 426 416 Cerbonale mg/L 0 6 0 < 2 Cation - Anian Balance % 0 0 0 0 Cations maq/L 4 9 4.9 4.9 4.9 Chloride mg/L 1 4 2 2 Contlugwity (Lab) umhos/cm 453 453 453 453 Copper, dissolved mg/L 000 0.00 0.00 < 0.01 Fluonde mg/L 0.1 0.1 0.1 01 Hardness mg/L 95 190 156 151 Hydroxide mg/L 0 0 0 < 2 Iron, dissolved mg/L 0.05 005 0.05 0.05 Iron, total mg/L 0.41 3.59 7.07 1 51 Lead. dissolved mg/L 0.00 0.00 0 00 c 0.04 Magnesium, dissolved mg/L 6.9 13.7 11 6 11.5 Manganese, dissolved mg/L 0.012 0 012 0 012 0.072 Manganese, total mglL 0 010 0.094 0.068 0.077 Mercury, total recoverable mg/L 0 0000 0.0000 0.0000 < D 0002 Molybdenum. dissolved mg/L 0 00 0.00 0.00 < 0.01 Nitrate (es N), dissolved mg/L 0 03 0.23 0.122 0.13 NilrateMitdte (as N) mg/L 0.04 0.23 0.13 0.14 Nitrite (as N), dissolved mg/L 0.00 0.02 0.00 0.01 pH (Lab) SU 8 8 8 B Phosphate mg/L 0.2 0.2 0.2 0.2 Phosphate (Ortho). dissolved mg/L 0.000 0.066 0.018 0.066 Potassium, dissolved mryL 1 8 1.8 1.8 1.8 Selenium, total recoverable mg/L 0 00 0.00 0.00 < 0.04 Sodium Absorbtion Ratio 0 94 1.65 1.4625 1.55 Sodium, tli55olved mg/L 20.9 47 8 40 2 43 4 Sodium. total mg/L 40 49 45 40 Total DissoNetl Solids (Lab) mg/L 770 290 252 240 Total Suspended Solitls mglL 0 50 17 50 Zinc. dissolved mg/L 0 00 0.00 0.00 < 0 01 Sudace98.xls West Elk Mine s/1z/s9 1998 Annual Hydrology Report Wright Water Engineers