2013-07-02_REPORT - C1980007 (3)

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West Elk Mine 2012 Annual Hydrology Report 13 Table 3. Summary of the Surface Water Monitoring Program Monitoring Station "' Monitored Area Flow Measurement Field WQ Annual Lab Water Period of Record (pFl, EC, T) Quality Surface Stations Upper North Fork of the Gunnison River Drainage Basin Up- gradient of SE come panels, Upper Deep Creek down - gradient of SOD mine instantaneous, 3 x Year 3 x Year Peak Flow Period "' 1996 to present panels area Lower Deep Creek Down - gradient of SE longwall Instantaneous, 3 x Year 3 x Year Peak Flow Period'" 1996 to present panels area Upper Raven Gulch W Flatiron mine panels area Instantaneous, 3 x Year 3 x Year Peak Flow Period'" 2005 to present Lower Raven Gulch W Flatiron mine panels area Instantaneous, 3 x Year 3 x Year Peak Flow Period "' 2005 to present Box Canyon Down - gradient of Box Canyon Instantaneous, 3 x Year 3 x Year Peak Flow Period "' 1999 to present mine panels area North Fork Upper Up- gradient of mine facilities and Continuous 3 x Year Low Flow Period, Peak 1977 to present (USGS 09132500)) mine discharge points Irrigation Season' Up- gradient of mine surface Upper Sylvester Gulch facilities area and NE mine Instantaneous, 3 x Year 3 x Year Peak Flow Period ` ' 1977 to present panels Down - gradient of mine water Middle Sylvester Gulch discharge point and NE mine Continuous 3 x Year Peak Flow Period "' 1977 to present panels Down - gradient of mine surface Lower Sylvester Gulch facilities area and NE mine Not Measured 3 x Year Peak Flow Period "' 1977 to present panels Surface Stations Lower North Fork of the Gunnison River Drainage Basin North Fork Lower Down- gradient of mine facilities Not Measured 3 x Year Low Flow Period, Peak 1935- present and mine discharge Irrigation Season Lower Gabble Gulch Jumbo Mountain and NW mine Instantaneous, 3 x Year 3 x Year Peak Flow Period'' 1977 to present panels area Surface Stations Minnesota Creek Drainage Basin Lick Creek Flume Up- gradient of SOD mine panels Continuous 3 x Year Peak Flow Period "' 1977 to present area Upper Dry Fork Flume SOD mine panels area Continuous 3 x Year Peak Flow Period ` ' 1977 to present Middle Dry Fork Flume SOD mine panels area Continuous 3 x Year Peak Flow Period "' 1977 to present Lower Dry Fork Flume Down - gradient of SW and SOD Continuous 3 x Year Peak Flow Period'' 1977 to present mine panels area Minnesota Reservoir Flume Down - gradient of SW and SOD Continuous 3 x Year Peak Flow Period's' 2006 to present mine panels area Deep Creek Ditch Flume Up- gradient of SOD mine panels Continuous 3 x Year Peak Flow Period "' 2006 to present area Poison Gulch SOD mine panels area Instantaneous, 3 x Year 3 x Year Peak Flow Period's' 2005 to present Deer Creek SOD mine panels area Instantaneous, 3 x Year 3 x Year Peak Flow Period `s' 2005 to present Horse Gulch Down - gradient of the SW mine Instantaneous, 3 x Year 3 x Year Peak Flow Period "' 1977 to present panels area East Gulch, East of Horse Gulch SOD and SW mine panels area Instantaneous, 3 x Year 3 x Year Peak Flow Period " 1977 to present Upper Minnesota Creek (USES) SOD mine panels area Continuous 3 x Year Peak Flow Period "' 1977 to present Lower Minnesota Creek (USGS) Down- gradient of SOD and SW Continuous 3 x Year Peak Flow Period "' 1937 -1947 and mine pan eIs area 1985 to present South Prong Creek Mouth of South Prong Creek Instantaneous, 6 x Year 6 x Year Peak Flow Period "' Baseline will start in —2017 SW mine panels area — southwest B -seam longwall panels SE mine panels area - southeast B -seam longwall panels Box Canyon mine panels area - Box Canyon B -seam longwall panels W Flatiron mine panels area - West Flatiron B -seam longwall panels Jumbo Mountain mine panels area - Jumbo Mountain B -seam longwall panels SOD mine panels area - South of the Divide E -seam longwall panels " For sites with more than 5 years of data, lab parameters include TSS, TDS, Cond , pH, and Fe (diss & total) " For sites with 5 years or less data see Table 2 NFGR and Middle Sylvester Gulch expanded parameters include those listed in Table 2 for surface water plus chromium, nickel, silver (total), cyanide (total), nitrate /nitrite (as N), alkalinity (Total CaCO,), bicarbonate, carbonate, hydroxide, and phosphorus -ortho, nitrogen (ammonia) and sodium absorption ratio (SAR) June 2013 HydroGeo, Inc.