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2016 Recommended Modifications to the West Elk Mine Hydrologic Monitoring Network 20 <br />2.1.1.8 Spring CR -12 (Decreed Spring #12) <br />Spring CR -12 is located in Lone Pine Gulch above Panel 5 in the Northwest B -Seam historic <br />mine area (Map 1). It issues from alluvium on the south side of the gulch. This is a perennial <br />spring, but the volume of flow diminishes in summer and autumn. This spring has been <br />monitored since 1993 and was undermined in December 1993. The spring flow measurements <br />were highly variable from 1993 to 1997, with no flows in the spring of 1994, and maximum <br />flows in the spring of 1997. A time -series flow graph for Spring CR -12 is shown on Figure 15. <br />Figure 15. Flow in Snrina CR -12 <br />Time -series water quality data from Spring CR -12 do not indicate any adverse trends in water <br />quality. There are no baseline water quality values for this site due to insufficient flows for <br />baseline measurements and sampling (WWE, 2001; MCC, 2016). The laboratory ECs for this <br />spring for the period of record are variable, ranging from 906 to 1,440 µmhos/cm and averaging <br />1,204 µmhos/cm. TDS values are also variable, ranging from 660 to 970 mg/L, and averaging <br />777 mg/L. The field pH values for this spring over the period of record range from 7.28 to 8.90 <br />s.u., and average 8.32 s.u. TSS values are variable, ranging from ND to 332 mg/L. Dissolved <br />iron values range from ND to 0.16 mg/L. Total iron values range from 0.04 to 3.14 mg/L, and <br />average 1.16 mg/L. The time -series water quality graphs for Spring CR -12 are shown in Figure <br />16. <br />August 2016 HydroGeo, Inc. <br />