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Probable Hydrologic Consequences(PHC),predictions in <br /> V. Minimization of section 4.8.3 of Trapper's permit appear to be accurate. <br /> disturbance to the Significant changes in the point of compliance wells do not <br /> hydrologic CDRMS appear to have occurred in 2020. <br /> balance within regulation <br /> 4.05.1(1) Probable Hydrologic Consequences(PHC),predictions in <br /> and adjacent to section 4.8.3 of the permit appear accurate. Significant changes <br /> the permit area in surface water quality or quantity have not been observed for <br /> 2020. <br /> W. Prevention of <br /> material damage CDRMS Probable Hydrologic Consequences(PHC),predictions in section <br /> to the hydrologic regulation 4.8.3 of Trapper's permit appear to be accurate for both surface <br /> balance outside 4.05.1(1) and ground water. <br /> the permit area <br /> Overall,PHC predictions appear to be accurate,as illustrated by <br /> the following examples. <br /> Per the PHC,Trapper does not anticipate recharge to the shallow <br /> aquifer systems to be adversely affected by mining operations. <br /> Water levels in wells GC-2,GP-9, and P-8 (used to monitor the <br /> Third White Sandstone)have remained stable during recent <br /> monitoring. GC-2 is showing an increasing overall trend. <br /> Per the PHC,constituent concentrations in backfill aquifers, <br /> namely TDS and sulfate,are expected to be higher than pre- <br /> X. Agreement of mining concentrations for an extended period of time after mining. <br /> observed CDRMS The data for TDS concentrations in wells in backfill aquifers have <br /> hydrologic shown apparent impacts from mining. TDS concentrations in GD- <br /> impacts with regulation 205 3 continue to increase and GF-5 remains stable,both are <br /> PHC projected in . .6(3) somewhat higher to those of native aquifers in these areas. TDS <br /> permit values for wells GF-7 and GF-11 were higher than the naturally <br /> observed concentrations in the 1990s and 2000s,but remain below <br /> historic high concentrations. Sulfate concentrations continue to <br /> exhibit similar trends as TDS for wells GF-7 and GF-11. Sulfate <br /> concentrations increased in GD-3 and GD-2 in 2020 continuing a <br /> trend that appears to have begun around 2008. <br /> TDS/Sulfate levels in these wells should be watched closely in <br /> future years. <br /> Backfill aquifers will continue to have an impact on surface base <br /> flow water quality(TDS),conditions. <br /> Y. Adequacy of CDRMS <br /> groundwater regulation Adequate <br /> monitoring 4.05.13(1) <br /> program <br /> Z. Adequacy of CDRMS <br /> surface water regulation Adequate <br /> monitoring 4.05.13(2) <br /> program <br /> Page 7 <br />