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West Elk Mine 2007 Annual Hydrology Report 44 <br />• (780 mg/1 duplicate) compared to the maximum baseline value of 516 mg/1, and a TSS of 36 mg/l <br />(26 mg/1 duplicate) compared to the maximum baseline value of 24 mg/l. Spring G-20 showed a <br />high total iron concentration of 9.44 mg/1 compared to a maximum baseline value of 0.32 mg/I and <br />a related TSS value of 226 mg/1 compared to a maximum baseline value of 19.6 mg/1. Spring G-31 <br />had a slightly elevated conductivity of 1,050 [mhos/cm compared to the maximum baseline value <br />of 975 gmhos/cm and TDS of 600 mg/1 compared to the maximum baseline value of 505 mg/1. <br />Spring G-25 had an elevated conductivity of 1,830 pmhos/cm compared to the maximum baseline <br />value of 1,320 gmhos/cm, and TDS of 1,190 mg/1 compared to the maximum baseline value of <br />1,170 mg/1. Spring G-35 had a slightly elevated conductivity of 1,270 µunhos/cm compared to the <br />maximum baseline value of 1,130 µm os/cm and TSS of 50 mg/1 compared to the maximum <br />baseline value of 16 mg/1. Spring G-49 had a slightly elevated conductivity of 2,160 µmhos/cm <br />compared to a maximum baseline value of 1,800 µmhos/cm. Spring J-4 had a slightly elevated <br />conductivity of 500 µmhos/cm (502 µmhos/cm duplicate) compared to the maximum baseline <br />value of 429 µmhos/cm and TDS of 310 mg/1 compared to the maximum baseline value of 300 <br />mg/1. These increased concentrations are most likely due to low flow rates during the sampling <br />period in 2004, 2005 and 2006 and are not believed to be related to mining operations. MCC will <br />• continue to monitor the water quality of these springs to in order to discern any changes in water <br />quality trends. No mining-induced impacts to water quality or flows in the monitored springs are <br />anticipated in WY 2008. <br />5.3 Stock Ponds and USFS Water Resources <br />Numerous stock ponds and USFS water resources are located in the Project area. The USFS water <br />resource sites are summarized in Table 8 and shown in Map 3. There are no reported water loss or <br />mining related water quality issues at any of these locations through WY 2007 and none are <br />expected in the future. <br />5.4 Ground Water <br />MCC maintains a network of 28 ground water monitoring wells (including seven dysfunctional <br />wells with collapsed casing or obstructions) throughout the permit and lease areas. A summary of <br />the ground water well monitoring schedule is presented in Table 5 and the well completion data is <br />presented in Table 6. The locations of the ground water monitoring wells are shown on Map 2. <br />The well water elevation and depth to water data are presented in Appendix F and the ground water <br />• quality data are presented in Appendix G. <br />June 2008 HydroGeo, Inc.