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West Elk Mine 2016 Surface Water and Groundwater Quantity and Quality Data Summary 16 <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 />9/8/2016 <br />Conductivity (Field) <br />µmhos/cm <br />496 <br />258 <br />Lower Raven Gulch <br />5/3/2016 <br />pH (Field) <br />SU <br />855 <br />772 <br />5/26/2016 <br />875 <br />9/8/2016 <br />8 79 <br />5/26/2016 <br />Conductivity @25C <br />µmhos/cm <br />247 <br />170 <br />5/26/2016 <br />Residue, Filterable JDS) @180C <br />mg/L <br />164 <br />120 <br />5/24/2016 <br />Conductivity @25C <br />µmhos/cm <br />618 <br />547 <br />5/24/2016 <br />Iron, total <br />mg/L <br />707 <br />292 <br />Deer Creek <br />5/24/2016 <br />Residue, Filterable (TDS) @180C <br />mg/L <br />406 <br />330 <br />5/24/2016 <br />Residue, Non -Filterable (TSS) @105C <br />mg/L <br />258 <br />68 <br />5/4/2016 <br />pH (Field) <br />SU <br />957 <br />7.08 <br />5/24/2016 <br />Conductivity @25C <br />µmhos/cm <br />481 <br />295 <br />Poison Gulch <br />5/24/2016 <br />Residue, Filterable (TDS) @180C <br />mg/L <br />268 <br />170 <br />5/24/2016 <br />Residue, Non -Filterable (TSS) @105C <br />mg/L <br />400 <br />28 <br />June 2017 HydroGeo, Inc. <br />