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Page 3 <br />Requirement Regulation Comment <br />20. Prevention of adverse <br />impacts to ground water <br />systems outside permit area <br /> <br />CDRMS regulation <br />4.05.11(1) <br /> <br />Well series GWN-N16P, GWN-N17P1 , GWN- <br />N18P1. (underburden, coal, overburden respectively) <br />Maximum levels of TDS, sulfate, calcium, sodium, <br />and magnesium occurred at GWN-N16P1 <br />(underburden). Maximum levels for TDS, calcium, <br />iron, manganese, and magnesium occurred at GW- <br />N17P1 (Dakota coal aquifer). Calcium appears to be <br />trending down. Iron is trending up and measured a <br />steep increase in 2016 and 2017 at GW-N17P1. <br />These are expected to continue to increase before <br />concentrations level off. pH is remaining stable. <br /> <br />GW-N3 (underburden within Tuttle draw) <br />Appears stable. <br /> <br />GW-N36, GW-N37, and GW-N38 (Up gradient <br />overburden, Dakota coal, and underburden <br />respectively) Up gradient maximums for Iron were <br />reached in 2010 and 2011. Parameters appear to be <br />decreasing in up gradient wells. <br /> <br /> GW-N39, GW-N40 (alluvial aquifer Calamity draw, <br />up and down gradient respectively) <br />Parameters appear stable with Iron tending up in the <br />up gradient GW-N39 and sodium and Magnesium <br />increasing in the down gradient GW-N40 <br /> <br />GW-N41, GW-N42, GW-N43 (Up gradient <br />underburden, coal, overburden respectively) <br />parameters appear stable and mostly decreasing. <br /> <br />GW-N44, GW-N45, GW-N46 (Down gradient <br />underburden, coal, overburden respectively) <br />Parameters are increasing within the Dakota coal <br />aquifer down gradient and mostly stable in the under <br />and overburden at this time. <br /> <br />21. Prevention of impacts to <br />ground water that adversely <br />impact post-mining land use <br /> <br />CDRMS regulation <br />4.05.11(2) <br /> <br /> <br />22. Minimize disturbance to <br />hydrologic balance within and <br />adjacent to the permit area <br /> <br />CDRMS regulation <br />4.05.1(1) <br /> <br /> <br />23. Prevention of material <br />damage to the hydrologic <br />balance outside the permit <br />area <br /> <br />CDRMS regulation <br />4.05.1(1) <br /> <br />Impacted are as predicted in the PHC.