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West Elk Mine 2016 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 />Upper North Fork <br />(USGS) <br />9/7/2016 <br />Magnesium, dissolved <br />mg/L <br />41 <br />34 <br />9/7/2016 <br />Sodium, dissolved <br />mg/L <br />69 <br />57 <br />Upper Sylvester <br />Gulch <br />5/5/2016 <br />Conductivity (Field) <br />µmhos/cm <br />680 <br />380 <br />5/25/2016 <br />691 <br />9/7/2016 <br />729 <br />5/25/2016 <br />Conductivity @25C <br />µmhos/cm <br />643 <br />462 <br />5/25/2016 <br />Iron, dissolved <br />mg/L <br />0.03 <br />001 <br />5/25/2016 <br />Iron, total <br />mg/L <br />028 <br />007 <br />5/25/2016 <br />Residue, Filterable (TDS) @180C <br />mg/L <br />424 <br />260 <br />5/25/2016 <br />Chloride <br />mg/L <br />156 <br />10 <br />9/7/2016 <br />33.3 <br />9/7/2016 <br />Conductivity @25C <br />µmhos/cm <br />1,060 <br />800 <br />Middle Sylvester <br />Gulch <br />5/25/2016 <br />Nitrate/Nitrite (as N) <br />mg/L <br />009 <br />0.08 <br />9/7/2016 <br />Sodium Adsorption Ratio (SAR) <br />Calc <br />65 <br />302 <br />9/7/2016 <br />Sulfate <br />mg/L <br />976 <br />80 <br />9/7/2016 <br />Residue, Filterable (TDS) @180C <br />mg/L <br />662 <br />584 <br />Lower Sylvester <br />5/5/2016 <br />Conductivity (Field) <br />µmhos/cm <br />844 <br />700 <br />5/27/2016 <br />813 <br />9/8/2016 <br />1,068 <br />Gulch <br />5/27/2016 <br />Conductivity @25C <br />µmhos/cm <br />736 <br />597 <br />5/27/2016 <br />Iron, dissolved <br />mg/L <br />017 <br />005 <br />5/27/2016 <br />Iron, total <br />mg/L <br />132 <br />0.17 <br />Middle Dry Fork Fl <br />5/24/2016 <br />Conductivity @25C <br />µmhos/cm <br />218 <br />76 <br />Lower Gribble5/23/2016 <br />Gulch <br />Residue, Filterable (TDS) @180C <br />mg/L <br />492 <br />60 <br />5/23/2016 <br />(Duplicate)756 <br />East Gulch, East of <br />5/2/2016 <br />Conductivity (Field) <br />µmhos/cm <br />579 <br />480 <br />5/24/2016 <br />573 <br />Horse Gulch <br />5/24/2016 <br />Conductivity @25C <br />µmhos/cm <br />574 <br />453 <br />5/24/2016 <br />Residue, Filterable (TDS) @180C <br />mg/L <br />342 <br />290 <br />9/5/2016 <br />Conductivity (Field) <br />gmhos/cm <br />458 <br />310 <br />Upper Deep Creek <br />5/24/2016 <br />Iron, total <br />mg/L <br />163 <br />9.43 <br />9/5/2016 <br />Conductivity (Field) <br />µmhos/cm <br />484 <br />380 <br />Lower Deep Creek <br />5/25/2016 <br />Iron, total <br />mg/L <br />12.9 <br />5 83 <br />5/25/2016 <br />Residue, Non -Filterable (TSS) @105C <br />mg/L <br />520 <br />448 <br />9/8/2016 <br />Conductivity (Field) <br />µmhos/cm <br />504 <br />241 <br />Upper Raven Gulch <br />5/26/2016 <br />Conductivity @25C <br />µmhos/cm <br />240 <br />165 <br />5/26/2016 <br />Residue, Filterable (TDS) @180C <br />mg/L <br />168 <br />110 <br />June 2017 HydroGeo, Inc- <br />