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2016 Recommended Modifications to the West Elk Mine Hydrologic Monitoring Network 18 <br />2.1.1.7 Spring G-49 <br />Spring G-49 is located on the north flank of Jumbo Mountain, west of Gribble Gulch, in an <br />unnamed drainage tributary to the North Fork of the Gunnison River. Spring G-49 is situated <br />north of Panel 8 in the Northwest B -Seam historic mine area (Map 1). Flow is perennial, but <br />diminishes in the autumn. This spring issues from alluvium and hydrological monitoring <br />measurements are taken at the end of an outflow pipe from an enclosed spring house. Spring G- <br />49 has been monitored since 1994 and was undermined in the summer of 1995. The spring flow <br />measurements were highly variable from 1994 to 1998, but have been relatively steady since <br />October 1999. Deterioration of the spring house outflow pipe has caused flows to diminish <br />slightly since 2011. A time -series flow graph for Spring G-49 is shown on Figure 13. <br />Figure 13. Flow in Spring G-49 <br />Time -series water quality data from Spring G-49 do not indicate any adverse trends in water <br />quality. The laboratory ECs for this spring for the period of record are variable, ranging from <br />798 to 2,580 µmhos/cm and averaging 2,027 µmhos/cm. In comparison, the baseline laboratory <br />EC values range from 317 to 1,800 µmhos/cm. TDS values for this spring for the period of <br />record are also variable, ranging from 470 to 2,340 mg/L, and averaging 1586 mg/L, compared <br />to baseline values ranging from 230 to 1,720 mg/L. There are no baseline values for field pH for <br />this site (WWE, 2001) for comparison; however, baseline certified laboratory pH data are <br />available for comparison. The field pH values over the period of record are relatively steady, <br />ranging from 7.03 to 8.22 s.u. In comparison, the baseline laboratory pH values range from 7.9 <br />to 8.3 s.u. TSS values for the period of record range from ND (13 of 15 values) to 20 mg/L, <br />compared to a baseline maximum of 724 mg/L. Dissolved iron values range from ND to 0.08 <br />mg/L, compared to a maximum baseline value of 0.08 mg/L. Total iron values range from ND to <br />1.16 mg/L, compared to a maximum baseline value of 22.6 mg/L. The time -series water quality <br />graphs for Spring G-49 are shown in Figure 14. <br />August 2016 HydroGeo, Inc. <br />