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West Elk Mine 2016 Surface Water and Groundwater Quantity and Quality Data Summary 5 <br />Table 3. Summary of the Surface Water Monitoring Program <br />11 <br />Field WQ <br />Annual Lab Water <br />Period of <br />Monitoring Station <br />Monitored Area <br />Flow Measurement <br />'1) <br />I <br />(pH, EC, <br />Quality <br />Record <br />Surface Water Stations Upper North Fork of the Gunnison River Drainage Basin <br />Up -gradient of SE mine panels, <br />Upper Deep Creek <br />down -gradient of SOD mine <br />Instantaneous, 3 x Year <br />3 x Year <br />Peak Flow Period'" <br />1996 to present <br />panels area <br />Lower Deep Creek <br />Down-gradientaoefa SE mine panels <br />Instantaneous, 3 x Year <br />3 x Year <br />Peak Flow Period" <br />1996 to present <br />Upper Raven Gulch <br />W Flatiron mine panels area <br />Instantaneous, 3 x Year <br />3 x Year <br />Peak Flow Period " <br />2005 to present <br />Lower Raven Gulch <br />W Flatiron mine panels area <br />Instantaneous, 3 x Year <br />3 x Year <br />Peak Flow Period <br />2005 to present <br />Box Canyon <br />Down -gradient of Box Canyon <br />Instantaneous, 3 x Year <br />3 x Year <br />Peak Flow Period " <br />1999 to present <br />mine panels area <br />North Fork Upper <br />Up -gradient of mine facilities and <br />Continuous <br />3 x Year <br />Low Flow Period, Peak <br />to present <br />(USGS 09132500)) <br />mine discharge points <br />Irrigation Season (')1977 <br />Up -gradient of mine surface <br />Upper Sylvester Gulch <br />facilities area and NE mine <br />Instantaneous, 3 x Year <br />3 x Year <br />Peak Flow Period " <br />1977 to present <br />panels <br />Down -gradient of mine water <br />Middle Sylvester Gulch <br />discharge point and NE mine <br />Continuous <br />3 x Year <br />Peak Flow Period ' <br />1977 to present <br />panels <br />Down -gradient of mine surface <br />Lower Sylvester Gulch <br />facilities area and NE mine <br />Not Measured <br />3 x Year <br />Peak Flow Period " <br />1977 to present <br />panels <br />Surface Water Stations Lower North Fork of the Gunnison River Drainage Basin <br />North Fork Lower <br />Down -gradient of mine facilities <br />Not Measured <br />3 x Year <br />Low Flow Period, Peak <br />(3) <br />1935 -present <br />and mine discharge <br />Irrigation Season <br />Lower Grabble Gulch <br />Jumbo Mountain and NW mine <br />Instantaneous, 3 x Year <br />3 x Year <br />Peak Flow Period " <br />1977 to present <br />panels area <br />Surface Water Stations Minnesota Creek Drainage Basin <br />Lick Creek Flume <br />Up -gradient of SOD mine panels <br />Continuous <br />3 x Year <br />Peak Flow Period" <br />1977 to present <br />area <br />Upper Dry Fork Flume <br />SOD mine panels area <br />Continuous <br />3 x Year <br />Peak Flow Period " <br />1977 to present <br />Middle Dry Fork Flume <br />SOD mine panels area <br />Continuous <br />3 x Year <br />Peak Flow Period " <br />1977 to present <br />Lower Dry Fork Flume <br />Down -gradient of SW and SOD <br />Continuous <br />3 x Year <br />Peak Flow Period " <br />1977 to present <br />mine panels area <br />Minnesota Reservoir Flume <br />Down -gradient of SW and SOD <br />Continuous <br />3 x Year <br />Peak Flow Period(') <br />2006 to present <br />mine panels area <br />Deep Creek Ditch Flume <br />Up -gradient of SOD mine panels <br />Continuous <br />3 x Year <br />Peak Flow Period " <br />2006 to present <br />aa <br />Poison Gulch <br />SOD mine panels area <br />Instantaneous, 3 x Year <br />3 x Year <br />Peak Flow Period(') <br />2005 to present <br />Deer Creek <br />SOD mine panels area <br />Instantaneous, 3 x Year <br />3 x Year <br />Peak Flow Period ' <br />2005 to present <br />Horse Gulch <br />Down -gradient of the SW mine <br />Instantaneous, 3 x Year <br />3 x Year <br />Peak Flow Period <br />1977 to present <br />panels area <br />East Gulch, East of Horse Gulch <br />SOD and SW mine panels area <br />Instantaneous, 3 x Year <br />3 x Year <br />Peak Flow Period " <br />1977 to present <br />Upper Minnesota Creek (USFS) <br />SOD mine panels area <br />Continuous <br />3 x Year <br />Peak Flow Period " <br />1977 to present <br />Lower Minnesota Creek (USGS) <br />Down -gradient of SOD and SW <br />Continuous <br />3 x Year <br />Peak Flow Period <br />1937-1947 and <br />1985 to April 2, <br />mine panels area <br />2014 <br />Lower Minnesota Creek (CDWR) <br />Down -gradient of SOD and SW <br />Continuous <br />3 x Year <br />Peak Flow Periodp1 <br />April 30, 2014 to <br />mine panels area <br />present <br />Baseline will start <br />South Prong Creek <br />Mouth of South Prong Creek <br />Instantaneous, 6 x Year <br />6 x Year <br />Peak Flow Period (2) <br />—1 year prior to <br />mining operations <br />SW mine panels area— southwest B -seam longwall panels; SE mine panels area - southeast B -seam longwall panels <br />Box Canyon mine panels area -Box Canyon B -seam longwall panels; West Flatiron mine panels area- West Flatiron B -seam longwall panels <br />Jumbo Mountain mine panels area - Jumbo Mountain B -seam longwall panels <br />SOD mine panels area - South of the Divide E -seam longwall panels <br />1) For sites with more than 5 years of data, lab parameters include TSS, TDS, EC, pH, and Fe (dissolved & total) <br />2) For sites with 5 years or less data see Table 2 <br />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 <br />(total), cyanide (total), iron (total recoverable), nitrate/nitrite (as N), alkalinity (Total CaCO3), bicarbonate, carbonate, hydroxide, nitrogen (ammonia), <br />phosphorous-ortho (dissolved), and sodium adsorption ratio (SAR) <br />June 2017 HydroGeo, Ina <br />