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2016 Recommended Modifications to the West Elk Mine Hydrologic Monitoring Network 14 <br />Figure 9. Flow in Spring G-31 <br />Time -series water quality data from Spring G-31 do not indicate any adverse trends in water <br />quality. The laboratory ECs for this spring for the period of record are steady, ranging from 818 <br />to 1,050 µmhos/cm and averaging 910 µmhos/cm. In comparison, the baseline laboratory EC <br />values range from 95 to 975 µmhos/cm. TDS values for this spring for the period of record show <br />a slight decreasing trend, ranging from 530 to 620 mg/L, and averaging 568 mg/L, compared to <br />baseline values ranging from 100 to 505 mg/L. There are no baseline values for field pH for this <br />site (WWE, 2001) for comparison; however, baseline laboratory pH data are available for <br />comparison. The field pH values for this spring over the period of record are variable, ranging <br />from 7.11 to 9.41 s.u., and averaging 7.97 s.u. In comparison, the baseline laboratory pH values <br />range from 7.45 to 8 s.u. TSS values for this spring for the period of record range from ND to <br />155 mg/L. There are no TSS baseline data for comparison. Dissolved iron values range from <br />ND to 0.11 mg/L, compared to the maximum baseline value of 0.63 mg/L. Total iron values <br />range from 0.04 to 3.25 mg/L, with an average value of 1.02 mg/L, compared to a maximum <br />baseline value of 19.8 mg/L. The time -series water quality graphs for Spring G-31 are shown in <br />Figure 10. <br />August 2016 HydroGeo, Inc. <br />