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2016 Recommended Modifications to the West Elk Mine Hydrologic Monitoring Network 39 <br />values ranging from 7.27 to 8.29 s.u. TSS values for this stream for the period of record are <br />variable, ranging from 38 to 480 mg/L, and averaging 187 mg/L, compared to baseline values <br />ranging from 186 to 296 mg/L. Dissolved iron values are low, ranging from 0.02 to 0.2 mg/L, <br />and averaging 0.09 mg/L, compared to baseline values ranging from 0.05 to 0.10 mg/L. Total <br />iron values are variable, ranging from 1.27 to 12.3 mg/L, averaging 6.0 mg/L, compared to <br />baseline values ranging from 7.88 to 9.04 mg/L. Elevated total iron values are likely caused by <br />elevated sediment levels (from iron rich source rock) in the stream during peak flow sampling <br />events. The time -series water quality graphs for Lower Raven Gulch are shown in Figure 31. <br />August 2016 HydroGeo, Inc. <br />