2016-12-01_PERMIT FILE - C1980007A

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HYDROLOGIC CHARACTERIZATION AND MONITORING PLAN Table 7. Summary of the Surface Water Monitoring Program 16 Monitoring Station Itl Monitored Area Flow Measurement Field WQ Annual Lab Water 1 Period of (pH, EC, 1) Quality Record Surface Water Stations Upper North Fork of the Gunnison River Drainage Basin Up -gradient of SE mine 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 own -gradient of SE mine panels Instantaneous, 3 x Year 3 x Year Peak Flow Period'" 1996 to present area 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 UpperUp-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 Water Stations Lower North Fork of the Gunnison River Drainage Basin North Fork Lower Down -gradient of mine facilities Not Measured I 3 x Year I Low Flow Period, Peak I sent and and mine discharge Irrigation Season Surface Water 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 "' 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 " 2005 to present Deer Creek SOD mine panels area Instantaneous, 3 x Year 3 x Year Peak Flow Period "' 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 (USFS) SOD mine panels area Continuous 3 x Year Peak Flow Period "' 1977 to present USGS 1937-1947 and Lower Minnesota Creek (USGS) Down -gradient of SOD and SW Continuous 3 x Year Peak Flow Period "' 1985 to April 2, mine panels area 2014 Lower Minnesota Creek (CDWR) CDWR April 30, 2014 to resent Baseline will start South Prong Creek Mouth of South Prong Creek Instantaneous, 6 x Year 6 x Year Peak Flow Period �Z' one year prior to any mining actrvrt�es 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 SOD mine panels area - South of the Divide E -seam longwall panels 1) For sites with more than 5 years of data, lab parameters include TSS, TDS, EC, pH, and Fe (dissolved & total) 2) For sites with 5 years or less data see Table 6 3) North Fork of the Gunnison and Middle Sylvester Gulch expanded parameters include those listed in Table 6 for surface water, plus chromium, nickel, silver (total), cyanide (total), iron (total recoverable), nitrate/nitrite (as N), alkalinity (Total CaCO3), bicarbonate, carbonate, hydroxide, nitrogen (ammonia), phosphorous-ortho (dissolved), and sodium adsorption ratio (SAR) Revised 09/07- PR12; 08/16- TR139 HydroGeo, Inc