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Ground Water <br />Ground water monitoring sites are comprised of several sites which comprise the current, <br />upstream and downstream condition and are briefly described below. Please see Map 2.04.7-1 <br />for monitoring locations. <br />• GW -N47 monitors the underburden aquifer directly adjacent to the future mining area. <br />e GW -N48 monitors the Dakota coal aquifer directly adjacent to the future mining area. <br />9 GW -N49 monitors the overburden aquifer directly adjacent to the future mining area. <br />• GW -N50 monitors the underburden aquifer and represents the up gradient condition. <br />• GW -N51 monitors the Dakota coal aquifer and represents the up gradient condition. <br />• GW -N52 monitors the overburden aquifer and represents the up gradient condition. <br />• GW -N53 monitors the underburden aquifer and represents the down gradient condition. <br />GW -N54 monitors the Dakota coal aquifer which represents the down gradient condition. <br />• GW -N55 monitors the overburden aquifer which represents the down gradient condition. <br />• GW -N56 monitors the underburden aquifer down -dip of the mining area. <br />• GW -N57 monitors the Dakota coal aquifer down -dip of the mining area. <br />• GW -N58 monitors the overburden aquifer down -dip of the mining area. <br />New Horizon currently samples each groundwater site for a variety of quality parameters. Of all <br />the parameters that are analyzed for, several key indicator parameters are identified and are <br />addressed annually for the hydrology report. These are lab pH, lab conductivity, TDS, sulfate, <br />calcium, iron, magnesium, sodium and elevation. Ground water monitoring data for the water <br />year can be found in Appendix 1, and ground water summary graphs of the indicator parameters <br />for all monitoring locations are provided in Appendix 2. <br />121Page <br />