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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 -N 16P 1 monitors the underburden aquifer directly adj acent to the mining area. GW -N 17P 1 <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 />Mean %A . , Range MEN Min. . Min at <br />7 1 P a g e <br />8.3 <br />2.2Z, <br />6.7 <br />6/1/03 <br />4,5421,750 <br />"M <br />'= <br />3,490 <br />5/18/09 <br />3,496; <br />2,000, <br />2,460 <br />5/27/09 <br />V <br />1,959 <br />F`' <br />a- <br />1,630 <br />a <br />1,100 <br />5/21/09 <br />107 <br />334. <br />12 <br />9/9/02 <br />2,058 <br />29,490 <br />' s, <br />x '' <br />10If <br />r <br />3/23/10 <br />.-` <br />0.06 <br />0.27`` <br />a <br />0.00 <br />8/27/03 <br />:- <br />936 <br />" <br />552 <br />688 <br />3/3/17 <br />75 <br />246 <br />; <br />1 <br />2/26/07 <br />7 1 P a g e <br />