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Seneca II W <br />AHR 2017 <br />Page 6 <br /> <br /> <br /> <br /> <br />Requirement Requirement citation Comment <br /> levels are fluctuating in response to precipitation <br />recharge and ground water flow from the reclaimed <br />mine pits. <br />21. Prevention of impacts to <br />ground water that adversely <br />impact post-mining land use <br />CDRMS regulation <br />4.05.11(2) <br />No material damage has occurred, as discussed in <br />item 20, above. <br />22. Minimize disturbance to <br />hydrologic balance within <br />and adjacent to the permit <br />area <br />CDRMS regulation <br />4.05.1(1) <br />The disturbance to the hydrologic balance within and <br />adjacent to the permit area caused by mining and <br />reclamation at the Seneca IIW Mine is the minimum <br />that can be expected from a reclaimed surface mine at <br />this location. The operators’ use of best management <br />practices indicates minimization of disturbance to the <br />hydrologic balance. <br />23. Prevention of material <br />damage to the hydrologic <br />balance outside the permit <br />area <br />CDRMS regulation <br />4.05.1(1) <br />Surface water- A prediction was made that increases in <br />TDS would be observed at various stream sites during the <br />irrigation season (June-September). Predicted TDS <br />values were exceeded at two of three sites. Average TDS <br />at all three sites was lower than predicted for the 2017 <br />water year. <br /> <br />Ground water – In TAB 17 of the PAP, predictions <br />were made as to the expected TDS increases to be <br />observed at various monitoring wells. Predicted TDS <br />values were exceeded at two of the seven wells. <br /> <br />No material damage has occurred, as discussed in item <br />20, above. Agricultural ground water standards were <br />exceeded at six monitoring wells as per item 18 above. <br />Baseline information shows that several parameter <br />concentrations in excess of both irrigation and <br />livestock standards. <br />24. Agreement of observed <br />hydrologic impacts with <br />"probable hydrologic <br />consequences" projected in <br />mining <br />CDRMS regulation <br />2.05.6(3) and <br />requirement to keep <br />current, CDRMS <br />regulation 2.03.3(1) <br />No local or regional impacts were identified in the <br />AHR. This observation is consistent with the PHC. <br /> <br /> <br />25. Adequacy of ground <br />water monitoring program <br />CDRMS regulation <br />4.05.13(1) <br />The current ground water monitoring program <br />continues to adequately address the protection of the <br />hydrologic balance. <br />26. Adequacy of surface <br />water monitoring program <br />CDRMS regulation <br />4.05.13(2) <br />The current surface water monitoring program <br />continues to adequately address the protection of the <br />hydrologic balance. <br /> <br />