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West Elk Mine 2014 Annual Hydrology Report 20 <br />3.1.4.1 North Fork of the Gunnison River Temperature <br />Data Loggers <br />3.1.4.1.1 NFG-1 Temperature Data Logger <br />The NFG-1 temperature data logger monitoring site is located in the North Fork, <br />upstream of the confluence with Sylvester Gulch and just downstream the USGS gaging <br />station (09132500) (Figure 9). <br />3.1.4.1.2 NFG-2 Temperature Data Logger <br />The NFG-2 temperature data logger monitoring site is located in the North Fork, <br />approximately 750 feet downstream of the confluence with Sylvester Gulch (Figure 9). <br />3.1.4.1.3 NFG-3 Temperature Data Logger <br />The NFG-3 temperature data logger monitoring site is located in the North Fork, <br />downstream of all West Elk Mine activities and approximately 0.9 miles downstream of <br />the confluence with Sylvester Gulch (Figure 9). <br />3.1.4.2 Sylvester Gulch Temperature Data Loggers <br />3.1.4.2.1 MCSG-1 Temperature Data Logger <br />The MCSG-1 temperature data logger monitoring site is located in the unnamed tributary <br />to Sylvester Gulch, approximately 130 feet downstream of the MWPF mine water <br />discharge point (Figure 9). <br />3.1.4.2.2 MCSG-2 Temperature Data Logger <br />The MCSG-2 temperature data logger monitoring site is located in the same unnamed <br />tributary as MCSG-1 and is 18 feet upstream from the confluence with the main stem of <br />Sylvester Gulch (Figure 9). <br />3.1.4.2.3 MCSG-3 Temperature Data Logger <br />The MCSG-3 temperature data logger monitoring site is located on the main stem of <br />Sylvester Gulch, 33 feet upstream from the confluence with the unnamed tributary <br />(Figure 9). <br />3.1.4.2.4 MCSG-4 Temperature Data Logger <br />The MCSG-4 temperature data logger monitoring site is located in Sylvester Gulch, <br />approximately 150 feet downstream of the confluence with the unnamed tributary (Figure <br />9). <br />3.1.4.2.5 MCSG-5 Temperature Data Logger <br />The MCSG-5 temperature data logger monitoring site is located in Sylvester Gulch, <br />approximately 500 feet upstream of the confluence with the North Fork (Figure 9). <br />June 2015 HydroGeo, Inc. <br />