2016-12-01_PERMIT FILE - C1980007 (6)

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2016 Recommended Modifications to the West Elk Mine Hydrologic Monitoring Network 34 Table 2. Summary of the WEM Surface Water Monitoring Network Monitoring Station Monitored Area Flow Measurement Field WQ (pH, EC, T) Annual Lab ate Quality Period of Record Surface Stations Upper N. Fork Draina a Basin Upper Deep CreekUp-gradient of SE mine panels Instantaneous, 3 x Year 3 x Year Peak Flow Period 1996 to present Lower Deep Creek Down -gradient of SE mine panels Instantaneous, 3 x Year 3 x Year Peak Flow Period 1996 to present Upper Raven Gulch East of W. Flatiron Area Instantaneous, 3 x Year 3 x Year Peak Flow Period 2005 to present 5 Lower Raven Gulch East of W. Flatiron Area Instantaneous, 3 x Year 3 x Year Peak Flow Period 2005 to present cs Box Canyon Down -gradient of Box Canyon Panels Instantaneous, 3 x Year 3 x Year Peak Flow Period 1999 to present North Fork UpperUp-gradient USGS 09132500mine of mine facilities and discharge. Continuous 3 x Year Low Flow Period, Peak Irrigation Season ") 1977 to present Upper Sylvester Gulch Up -gradient of mine surface facilities area and NE mine panels Instantaneous, 3 x Year 3 x Year Peak Flow Period 1977 to present Middle Sylvester Gulch Down -gradient of mine water ischar a point and NE mine panels rominuous 3 x Year I Peak Flow Period 11977 to present Lower Sylvester Gulch own -gradient of mine surface Vacilities area and NE mine panels gnstantaneous, 3 x Year 3 x Year Peak Flow Period 1977 to resent Sur ace Stations Lower N. Fork Draina a Basin North Fork Lower Down -gradient of mine facilities and mine discharge. nstantaneous, 3 x Year 3 x Year Low Flow Period, Peak Irrigation Season " ' 11935- resent Lower Gribble Gulch Within historic NW mine panel area 11ristantaneous, 3 x Year 3 x Year eak Flow Period 11977 to present Su ace Stations Minnesota Creek Drain a a 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 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 own -gradient of SE mine panels nd un -mined SE coal lease area Continuous 3 x Year Peak Flow Period 1977 to present Poison Gulch iouth of the Divide Area Instantaneous, 3 x Year 3 x Year Peak Flow Period 2005 to present Deer Creek iouth of the Divide Area Instantaneous, 3 x Year 3 x Year Peak Flow Period 2005 to present orse Gulch iouth of the Divide Area Instantaneous, 3 x Year 3 x Year Peak Flow Period 1977 to present East Gulch, East of Horse ulch outh of the Divide Area Instantaneous, 3 x Year 3 x Year Peak Flow Period " 1977 to present pper Minnesota CreekUp-Gradient USFSun-mined of Dry Fork and west of SE coal lease area Continuous 3 x Year Peak Flow Period 1977 to present ower Minnesota Creek USGSpanels, own -gradient of Dry Fork, SE mine 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 2006 to present Minnesota Reservoir Flume South of the Divide Area Continuous 3 x Year Peak Flow Period 2006 to present South Prong Creek Mouth of South Prong Creek Instantaneous, 6 x Year 6 x Year Peak Flow Period Baseline starting in 2017 Stations listed upstream to downstream Yellow shaded items indicate sites proposed for removal from surface water monitoring network For sites with more than 5 years of data, lab parameters include TSS, TDS, Cond., pH, and Fe (dins. & tot) 2) For sites with 5 years or less data, lab parameters include TSS, TDS, Cond., pH, Ca, Mg, Na, K, SAR, hardness, bicarb., Cl, Nitrite/Nitrate, PO4, SOa, Fe (tot & diss.), Mn (tot & diss.), Al, As (tot), Cd, Cu, Pb, Hg (tot), Mb, Se (tot), Bo, Zn ' North Fork of the Gunnison and Middle Sylvester Gulch expanded parameters include those listed above 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 yet part of the current monitoring program. s> The baseline monitoring schedule for Raven Gulch stations was reduced to 3 times for the first year (CDRMS, 2005) August 2016 HydroGeo, Inc.