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2016 Recommended Modifications to the West Elk Mine Hydrologic Monitoring Network 42 <br />are low, ranging from ND to 0.143 mg/L, compared to baseline values ranging from 0.04 to 0.08 <br />mg/L. Total iron values are variable, ranging from 1.87 to 21.5 mg/L, averaging 8.2 mg/L, <br />compared to baseline values ranging from 8.49 to 8.89 mg/L. Elevated total iron values are <br />likely caused by elevated sediment levels (from iron rich source rock) in the stream during peak <br />flow sampling events. The time -series water quality graphs for Upper Raven Gulch are shown in <br />Figure 33. <br />August 2016 HydroGeo, Inc. <br />