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West Elk Mine 2015 Surface Water and Groundwater Quantity and Quality Data Summary 21 <br />Table 11. Summary of Well 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 />8/18/2015 <br />821 <br />Conductivity @25C <br />µmhos/cm <br />509 <br />8/18/2015 <br />(duplicate) <br />823 <br />8/18/2015 <br />3730 <br />Upper Dry Fk Alluvial Well <br />Iron, total <br />mg/L <br />259 <br />8/18/2015 <br />(duplicate) <br />38.10 <br />8/18/2015 <br />570 <br />Residue, Filterable (TDS) @180C <br />mg/L <br />390 <br />8/18/2015 <br />(duplicate) <br />568 <br />4/25/2015 <br />8.06 <br />5/28/2015 <br />824 <br />Lower Dry Fk Alluvial Well <br />pH (Field) <br />sU <br />710 <br />8/18/2015 <br />7 81 <br />Well SOM-80 <br />8/17/2015 <br />Conductivity @25C <br />µmhos/cm <br />1,040 <br />897 <br />Well SOM-45-H-2 <br />5/28/2015 <br />Conductivity (Field) <br />µm hos/cm <br />1,864 <br />1,626 <br />8/18/2015 <br />1,880 <br />8/18/2015 <br />Conductivity @25C <br />µmhos/cm <br />1,860 <br />1,390 <br />Well 03-11-1 <br />8/17/2015 <br />Conductivity @25C <br />µmhos/cm <br />3,160 <br />2,730 <br />4/26/2015 <br />Conductivity (Field) <br />µm hos/cm <br />3,510 <br />3,000 <br />5/28/2015 <br />3,530 <br />Well RAV -46 <br />8/17/2015 <br />Conductivity @25C <br />µmhos/cm <br />3,160 <br />2,700 <br />8/17/2015 <br />Residue, Filterable (TDS) @180C <br />mg/L <br />1,930 <br />1,710 <br />3.3.2 Impacts to Groundwater Quantity <br />Routine (post -baseline) monitoring of groundwater levels in the monitoring wells is <br />conducted three times per year, corresponding with rising limb, peak flow, and low flow <br />periods. Groundwater level and elevation data for the monitoring wells are summarized <br />in Appendices F and G. <br />Mining operations appear to have impacted the groundwater levels in several wells, but <br />levels may also have been impacted by drought conditions in recent years. The water <br />level drop in the following wells may be mining related due to the up -gradient diversion <br />of surface water runoff in the area. Wells GP -3, RPE -7, and GP -4 have been dry for <br />multiple years and have remained dry to nearly dry through WY 2015. Wells RPE -1 and <br />RPE -7 did not have enough water to collect a sample in WY 2015. As noted in Section <br />3.3, the casing in numerous wells has collapsed due to mining related subsidence, and <br />there were pronounced water level drops in several of these wells immediately prior to <br />the casing collapse. <br />Well water level trends are presented graphically in Appendix F. <br />June 2016 HydroGeo, Inc <br />