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West Elk Mine 2015 Surface Water and Groundwater Quantity and Quality Data Summary 15 <br />Table 9. Summary of Surface Water Quality Parameters Elevated 10 Percent or <br />More above Baseline Maximum Values <br />Site Name <br />Sample <br />Date <br />Parameter <br />Units <br />Result <br />Baseline <br />Maximum <br />Value <br />5/27/2015 <br />Conductivity (Field) <br />µmhos/cm <br />724 <br />380 <br />8/29/2015 <br />736 <br />Upper Sylvester <br />Gulch <br />5/27/2015 <br />Conductivity @25C <br />gmhos/cm <br />656 <br />462 <br />5/27/2015 <br />Iron, total <br />mg/L <br />148 <br />0.07 <br />5/27/2015 <br />Residue, Filterable (TDS) @180C <br />mg/L <br />388 <br />260 <br />5/26/2015 <br />Chloride <br />mg/L <br />37.8 <br />10 <br />8/17/2015 <br />415 <br />Middle Sylvester <br />Gulch <br />5/26/2015 <br />Sodium Adsorption Ratio (SAR) <br />calc <br />46 <br />3.02 <br />8/17/2015 <br />60 <br />5/26/2015 <br />Sulfate <br />mg/L <br />117 <br />80 <br />Lower Sylvester <br />Gulch <br />4/26/2015 <br />Conductivity (Field) <br />µmhos/cm <br />1,159 <br />700 <br />5/29/2015 <br />1,092 <br />8/29/2015 <br />1,050 <br />5/29/2015 <br />Conductivity @25C <br />µmhos/cm <br />994 <br />597 <br />5/29/2015 <br />Iron, total <br />mg/L <br />205 <br />0.17 <br />5/29/2015 <br />Residue, Filterable (TDS) @180C <br />mg/L <br />604 <br />430 <br />Middle Dry Fork <br />5/28/2015 <br />Conductivity @25C <br />µmhos/cm <br />135 <br />76 <br />Upper Dry Fork <br />5/27/2015 <br />Iron, total <br />mg/L <br />453 <br />3.64 <br />5/27/2015 <br />Residue, Non -Filterable (TSS) @105C <br />mg/L <br />127 <br />88 <br />Upper Deep Creek <br />4/23/2015 <br />Conductivity (Field) <br />µmhos/cm <br />387 <br />310 <br />8/19/2015 <br />484 <br />5/27/2015 <br />Iron, total <br />mg/L <br />1430 <br />943 <br />Lower Deep Creek <br />8/19/2015 <br />Conductivity (Field) <br />µmhos/cm <br />495 <br />380 <br />5/26/2015 <br />Iron, total <br />mg/L <br />2870 <br />583 <br />5/26/2015 <br />Residue, Non -Filterable (TSS) @105C <br />mg/L <br />1160 <br />448 <br />Lower Raven Gulch <br />5/28/2015 <br />Conductivity @25C <br />µmhos/cm <br />191 <br />170 <br />5/28/2015 <br />Conductivity @25C <br />µmhos/cm <br />423 <br />295 <br />Poison Gulch <br />5/28/2015 <br />Residue, Filterable (TDS) @180C <br />mg/L <br />246 <br />170 <br />Minnesota <br />Reservoir Flume <br />5/25/2015 <br />Iron, total <br />mg/L <br />775 <br />3.62 <br />5/25/2015 <br />Residue, Non -Filterable (TSS) @ 105C <br />mg/L <br />146 <br />60 <br />June 2016 HydroGeo, Ina <br />