2011-08-01_REPORT - C1980007 (5)

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Monitoring Station (1) Monitored Area Flow Measurement Field WQ (pH, EC, T) Annual Lab Water Quality Period of Record Surface Stations Upper N. Fork Drainage Basin Upper Deep Creek p- gradient of SE longwall panels Instantaneous, 3 x Year 3 x Year Peak Flow Period (') 1996 to present Lower Deep Creek Down- gradient of SE longwall , anels Instantaneous, 3 x Year 3 x Year Peak Flow Period ") 1996 to present Upper Raven Gulch ast of W. Flatiron Area Instantaneous, 3 x Year 3 x Year Peak Flow Period (2) 2005 to present Lower Raven Gulch ast of W. Flatiron Area Instantaneous, 3 x Year 3 x Year Peak Flow Period (2) 2005 to present Box Canyon ID own-gradient of Box Canyon Panels Instantaneous, 3 x Year 3 x Year Peak Flow Period (I) 1999 to present North Fork Upper (USGS 09132500)) Up- gradient of mine facilities and ine discharge. Continuous 3 x Year Low Flow Period, Peak Irrigation Season (3) 1977 to present Upper Sylvester Gulch p- gradient of mine surface acilities area and NE mine I anels Instantaneous, 3 x Year 3 x Year Peak Flow Period (') 1977 to present Middle Sylvester Gulch 6 own - gradient of mine water discharge point and NE mine • anels Continuous 3 x Year Peak Flow Period ") 1977 to present Lower Sylvester Gulch sown- gradient of mine surface facilities area and NE mine IIanels Not Measured 3 x Year Peak Flow Period (') 1977 to present Surface Stations Lower N. Fork Drainage Basin North Fork Lower Down - gradient of mine facilities and mine discharge. Not Measured 3 x Year Low Flow Period, Peak Irrigation Season (3) 1935- present Lower Gribble Gulch Within completed NW mine panel area Instantaneous, 3 x Year 3 x Year Peak Flow Period (') 1977 to present Surface Stations Minnesota Creek Drainage Basin Lick Creek Flume Up- gradient of un -mined SE coal lease area Continuous 3 x Year Peak Flow Period (') 1977 to present Upper Dry Fork Flume South of the Divide Area Continuous 3 x Year Peak Flow Period (2) —1977 to present Middle Dry Fork Flume South of the Divide Area Continuous 3 x Year Peak Flow Period (') 1977 to present Lower Dry Fork Flume Down - gradient of SE mine panels and un -mined SE coal lease area Continuous 3 x Year Peak Flow Period ") 1977 to present Poison Gulch South of the Divide Area Instantaneous, 3 x Year 3 x Year Peak Flow Period (2) 2005 to present Deer Creek South of the Divide Area Instantaneous, 3 x Year 3 x Year Peak Flow Period (2) 2005 to present Horse Gulch South of the Divide Area Instantaneous, 3 x Year 3 x Year Peak Flow Period (1) 1977 to present East Gulch, East of Horse Gulch South of the Divide Area Instantaneous, 3 x Year 3 x Year Peak Flow Period (' 1977 to present Upper Minnesota Creek (USFS) Up- Gradient of Dry Fork and west of un -mined SE coal lease area Continuous 3 x Year Peak Flow Period (U 1977 to present Lower Minnesota Creek (USGS) Down - gradient of Dry Fork, SE longwall panels, and SOD area Continuous 3 x Year Peak Flow Period (') 1937 -1947 and 1985 to present Deep Creek Ditch Flume South of the Divide Area Continuous 3 x Year Peak Flow Period (2) 2006 to present Minnesota Reservoir Flume South of the Divide Area Continuous 3 x Year Peak Flow Period (2) 2006 to present South Prong Creek' Mouth of South Prong Creek Instantaneous, 6 x Year 6 x Year Peak Flow Period (2) Baseline starting in —2017 • • West Elk Mine 2010 Annual Hydrology Report Table 3. Summary of the Surface Water Monitoring Program 13 Stations listed upstream to downstream ') For sites with more than 5 years of data, lab parameters include TSS, TDS, Cond., pH, and Fe (diss & tot) 2) For sites with 5 years or less data see Table 2 3) North Fork of the Gunnison and Middle Sylvester Gulch expanded parameters include those listed in Table 2 for surface water plus chromium, nickel, silver (total), cyanide (total), nitrite(as N), nitrate (as N), alkalinity (Total CaCO3), carbonate, hydroxide, and ortho- phosphate ' S Prong Creek is not part of the current (WY 2008) monitoring program. July 2011 HydroGeo, Inc.