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2016 Recommended Modifications to the West Elk Mine Hydrologic Monitoring Network 26 <br />Note: No baseline field or laboratory water quality data because the site was initially monitored voluntarily (HydroGeo, 2016b) <br />prior to officially being added to the monitoring network in 2005 (CDRMS, 2006). <br />Not Detected (ND) values graphed as zero. <br />2.1.2.3 Spring E-13-2 <br />Spring E-13-2 is located in the lower West Flatiron drainage that is the first tributary entering <br />Raven Gulch from the west (Map 1), which is tributary to the North Fork of the Gunnison River. <br />This spring was also monitored for the West Flatiron mine panels area and the Box Canyon mine <br />panels area. (Map 2). This spring is located about 2,000 feet to the east-southeast of the end of <br />the B -Seam longwall Panel 18, which was mined in February 2008. This spring issues from <br />sandstone beds above the F -seam, and flows are variable, typically diminishing significantly in <br />the late summer months. This spring was intermittently monitored voluntarily between 2002 and <br />2004 (HydroGeo, 2016b), and was officially added to the WEM monitoring network in WY <br />2005 (CDRMS, 2006). A time -series flow graph for Spring E-13-2 is shown on Figure 21. <br />Figure 21. Flow in Spring E-13-2 <br />Spring E-13-2 <br />Source: Above F -Seam <br />35 -- <br />3025 - <br />E <br />a <br />rn <br />3 <br />0 20 <br />a <br />N <br />15 - <br />10 __... _..... j i1.. <br />Jan -02 Jan -03 Jan -04 Jan -05 Jan -06 Jan -07 Jan -06 Jan -09 Jan -10 Jan -11 Jan -12 Jan -13 Jan -14 Jan -15 Jan -16 <br />Date <br />Time -series water quality data from Spring E-13-2 do not indicate any adverse trends in water <br />quality. There are no baseline field or laboratory water quality values for this site because it was <br />initially monitored voluntarily (HydroGeo, 2016b) prior to officially being added to the <br />monitoring network in 2005 (CDRMS, 2006). The laboratory ECs for this spring for the period <br />of record are relatively consistent, ranging from 275 to 485µmhos/cm and averaging 420 <br />µmhos/cm. TDS values are similarly consistent, ranging from 180 to 300 mg/L, and averaging <br />256 mg/L. The field pH values for this spring over the period of record range from 6.48 to 8.50 <br />s.u., and average 7.50 s.u., compared to the single baseline field pH of 7.04 s.u. TSS values are <br />variable, ranging from ND to 38 mg/L. Dissolved iron values are low, ranging from ND to 0.08 <br />August 2016 HydroGeo, Inc. <br />