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Ground Water <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. Water monitoring data from 2000 through <br />2016 can be found in Appendix 3, and summary graphs of the indicator parameters are provided <br />in Appendix 4. Please see Map 2.04.7-1A for monitoring locations. <br />GW-N16P1, GW-N17P1, and GW-N18P1 Well Series <br />GW-N16P1 monitors the underburden aquifer directly adjacent to the mining area. GW-N17P1 <br />monitors the Dakota coal aquifer directly adjacent to the mining area, and GW-N18P1 monitors <br />the overburden aquifer directly adjacent to the mining area. <br />Summary of the indicator parameters for each well are provided as follows: <br />71Page <br />.i S i <br />�Y, �C°tet:'.. Yd" ,.vir:r- <br />GW-N17Pi <br />Mean <br />Range r <br />-+-Yah.° <br />Min. <br />Parameter <br />,. <br />Min at <br />Std <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />y <br />8.3 <br />'0 2 <br />1.6 <br />7.0 <br />Lab pH <br />6/1/03 <br />t� ci) <br />3,002 <br />731 <br />4,047 <br />4,050 <br />3 <br />'StI815 <br />11/19/05 <br />TDS (mgli) <br />2,140 <br />496 <br />1,520 <br />3,010 <br />1,490 <br />8/8/17 <br />12/13/05 <br />Sulfate (149/1) <br />1,032 <br />404 <br />1,180 <br />1,710 <br />530 <br />8/8/17 <br />12/1/05 <br />Calcium (mg/1) <br />�38 <br />14 <br />41 <br />61 <br />20 <br />8/8/17 <br />2/17/06 <br />Iron (tot rec ug/1) <br />97 <br />56 <br />190 <br />200 <br />10 <br />5/21/13 <br />3/23/10 <br />Manganese (mg/1) <br />0.02 <br />0.02 <br />0.07 <br />0.08 <br />0.003 <br />3/8/05 <br />9/13/04 <br />Sodium (mg/1) <br />655 <br />116 <br />373 <br />850 <br />477 <br />8/8/17 <br />12/6/03 <br />Magnesium (mg/1) <br />17 <br />6 <br />27 <br />27 <br />1 <br />3/13/17 <br />2/26/07 <br />71Page <br />GW-N17Pi <br />Parameter <br />Mean <br />Std <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />dev <br />Lab pH <br />8.3 <br />0.3 <br />2.2 <br />8.9 <br />6.7 <br />5/18/09 <br />6/1/03 <br />Lab Cond. (umhos/cm) <br />4,542 <br />360 <br />1,750 <br />5,240 <br />3,490 <br />11/28/06 <br />5/18/09 <br />TDS (mg/1) <br />3,496 <br />421 <br />2,000 <br />4,460 <br />2,460 <br />8/8/17 <br />5/27/09 <br />Sulfate (mg/1) i <br />_ 1,959_ <br />329_ <br />1,630 <br />2,730 <br />1,100 <br />11/21/16 <br />5/21/0_9 <br />Calcium (mg/1) <br />107 <br />98 <br />334 <br />346 <br />12 <br />3/3/17 <br />9/9/02 <br />Iron (tot rec u ) <br />2,058 <br />5,788_ <br />29,490 <br />29,500 <br />10 <br />8/8/17 <br />3/23/10 <br />Manganese (mg/1) <br />0.06 <br />0.07 <br />0.27 <br />0.27 <br />0.00 <br />3/13/17 <br />8/27/03 <br />Sodium (me <br />936 <br />129 <br />552 <br />1,240 <br />688 <br />12/13/02 <br />3/3/17 <br />Magnesium (mg/1) <br />75 <br />68 <br />246 <br />246 <br />1 <br />3/13/17 <br />2/26/07 <br />71Page <br />