2010-06-30_REPORT - C1980007 (5)

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• • C] West Elk Mine 2009 Annual Hydrology Report 11 Table 3. Summary of the Surface Water Monitoring Program Monitoring Station o? Monitored Area Flow Measurement Field WQ (pH, EC, T) Annual Lab Water Quality Period of Record Surface Stations Upper N. Fork Draina a Basin Upper Dee Creek Up-gradient of SE mine panels Instantaneous, 3 x Year 3 x Year Peak Flow Period t' 1996 to resent Lower Dee Creek Down-gradient of SE mine panel Instantaneous, 3 x Year 3 x Year Peak Flow Period 1996 to resent Upper Raven Gulch East of W. Flatiron Area Instantaneous, 3 x Year 3 x Year Peak Flow Period ci) 005 to resent Lower Raven Gulch East of W. Flatiron Area Instantaneous, 3 x Year 3 x Year Peak Flow Period tZ) 005 to resent Box Canon own-gradient of Box Canyon Panels Instantaneous, 3 x Year 3 x Year Peak Flow Period 1999 to resent North Fork Upper USGS 09132500 Up-gradient of mine facilities and mine discharge. Continuous 3 x Year Low Flow Period, Peak Irrigation Season (3) 1977 to resent Upper Sylvester Gulch Up-gradient of mine surface facilities area and NE mine panels Instantaneous, 3 x Year 3 x Year Peak Flow Period t'l 1977 to resent fiddle Sylvester Gulch own-gradient of mine water discharge point and NE mine panels Continuous 3 x Year Peak Flow Period 1977 to resent Lower Sylvester Gulch own-gradient of mine surface facilities area and NE mine panels Instantaneous, 3 x Year 3 x Year Peak Flow Period 1977 to resent Surface Stations Lower N. Fork Drainage Basin North Fork Lower own-gradient of mine facilities and mine discharge. Instantaneous, 3 x Year 3 x Year Low Flow Period, Peak Irrigation Season (7) 1935-present Lower Gribble Gulch Within completed NW mine panel area Instantaneous, 3 x Year 3 x Year Peak Flow Period t l 1977 to resent Surface Stations Minnesota Creek Draina a Basin Lick Creek Flume Up-gradient of un-mined SE coal lease area Continuous 3 x Year Peak Flow Period 1977 to resent Upper D Fork Flume South of the Divide Area Continuous 3 x Year Peak Flow Period c2) 1977 to resent fiddle D Fork Flume South of the Divide Area Continuous 3 x Year Peak Flow Period 1977 to resent Lower Dry Fork Flume own-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 (Z> 005 to resent Deer Creek South of the Divide Area Instantaneous, 3 x Year 3 x Year Peak Flow Period tz) 005 to resent Horse Gulch South of the Divide Area Instantaneous, 3 x Year 3 x Year Peak Flow Period 1977 to resent East Gulch, East of Horse Gulch South of the Divide Area Instantaneous, 3 x Year 3 x Year Peak Flow Period t' 1977 to resent 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 1977 to resent Lower Minnesota Creek USGS) own-gradient of Dry Fork, SE mine panels, and SOD area Continuous 3 x Year Peak Flow Period 1937-1947 and 1985 to resent Deep Creek Ditch Flume South of the Divide Area Continuous 3 x Year Peak Flow Period (z) 006 to resent Minnesota Reservoir Flume South of the Divide Area Continuous 3 x Year Peak Flow Period cz> 006 to resent South Prong Creek° outh of South Prong Creek Instantaneous, 6 x Year 6 x Year Peak Flow Period (Z) Baseline starting in 2017 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) z> For sites with 5 years or less data see Table 2 'l 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), nittite(as N), nitrate (as N), alkalinity (Total CaCOA carbonate, hydroxide, and ortho-phosphate S Prong Creek is not part of the current (WY 2008) monitoring program. June 2010 HydroGeo, Inc.