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McClane Canyon Mine Expansion and Fruita Loadout Facility Biological Assessment <br />a <br />4O <br />N <br />5 ' 30 <br />m <br />•50 — <br />10 <br />N <br />0 - <br />(123.8) <br />Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec <br />Month <br />Figure 1 <br />Average Monthly Discharge in East Salt Creek, 1973 to 1982, Measured at USGS Gage 09163310. <br />Vertical Lines are Minimum and Maximum Monthly Flows. <br />Selenium (Se) occurs in East Salt Creek upstream and downstream from the McClane Canyon <br />Mine. The trace element also occurs in groundwater, in Cameo coal, in the rock matrix, and in <br />soils at the Mine site. One sample of coal from the Cameo coal seam contained 0.001 mg /kg of <br />selenium (equivalent to 1 pg /kg or 1 part per billion, 1 ppb). Two samples of soil that would be <br />affected contained <0.02 mg /kg. Leachate derived by a Toxicity Characteristic Leaching <br />Procedure (TCLP), from the projected coal mine waste was analyzed with a high detection limit <br />(0.05 mg /L or 50 pg /L), and thus failed to detect any selenium. However, selenium in water <br />when it was discharging from the Mine (prior to 2008) averaged 0.182 mg /L of selenium <br />(equivalent to 182 pg /L). Water recently sampled from a standing pool in the existing sediment <br />pond at the Mine was found to contain 0.022 mg /L (22 pg /L) of selenium. <br />In groundwater 5 , the average (2005 — 2007) selenium concentration was 115 pg /L (ranging <br />from 3 to 378 pg /L) for one monitoring well located above the coal seam (Monitoring Well 7 -34- <br />7). Dissolved selenium for groundwater in the Cameo coal seam (Monitoring Well 8 -3 -10) <br />averaged 248 pg /L (ranging from 34 to 508 pg /L) and selenium in groundwater below the coal <br />seam (Monitoring Well 8 -2 -8) averaged 89 pg /L (ranging from 2 to 212 pg /L). <br />Average selenium concentrations in East Salt Creek upstream and downstream from the Mine <br />were reported from 2005 through 2009. At the upstream site (station SW -1) selenium <br />1 The sample was taken on February 11, 2008, analyzed by ACZ using AB -DTPA Extraction see Table <br />2.1 -7 Cameo Coal Geochemical Data in McClane Canyon Mining, LLC Permit Revision Application <br />Number 2 submitted to M. Boulay, Division of Reclamation, Mining and Safety, Denver, Colorado by J.E. <br />Stover & Associates,. Inc. Grand Junction, Colorado. <br />2 See Table N -7 in Appendix N, McClane Canyon Mining, LLC Permit Revision Application Number 2. <br />3 See Table N -9 in Appendix N, McClane Canyon Mining, LLC Permit Revision Application Number 2. <br />4 Analysis conducted by Enviro -Chem Analytical, Inc., Grand Junction, CO reported to CAM Colorado, <br />LLC on June 28, 2011. <br />5 See Table 4 -2ii Surface Water Operational Data in McClane Canyon Mining, LLC Permit Revision <br />Application Number 2. <br />6 See Table 4 -2iii Surface Water Operational Data in McClane Canyon Mining, LLC Permit Revision <br />Application Number 2. <br />6 <br />