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Eagle Park Reservoir Chemical Loading and Mixing Analysis <br />Results <br />The results of the mixing model are presented in Table 5. <br />Table 5. Results of Mixing Model <br />Iron <br />Sulfate <br />Zinc <br />1 <br />Cadmium <br />Copper <br />Lead <br />Manganese <br />Molybdenum <br />pH <br />Mixing Scenario <br />Diss m /1) <br />( g <br />Diss m 1 <br />( g/) <br />Diss <br />Diss m 1 <br />( g/) <br />I <br />Diu (mg/1) <br />( <br />Diu m I <br />( 9/ 1 <br />ss <br />Di s <br />Feld su <br />mDi <br />Lake Volume = 1,077 ac-ft <br />Groundwater Flux = 10.9 ac-ft) <br />0.000008 <br />0.000002 <br />0.003 <br />0.00000001 <br />0.011 <br />0.037 <br />42 <br />0.0005 <br />7.5 <br />Segment 14 Water Quality <br />Z <br />Acute <br />0.0027 <br />0.013 <br />0.30 (WS) <br />0.0646 <br />2.99 <br />0.16 <br />Standards <br />All lakes and reservoirs tributary <br />250 (WS) <br />6.5 - 9.0 <br />to the Eagle River except for <br />Chronic <br />0.00042 <br />0.009 <br />1.0 (Trec) <br />0.0025 <br />65 <br />0.160 (Trec) <br />0.12 <br />0.0( <br />5 (WS) <br />specific listings in Segment 13 <br />Notes: <br />1. NPL values for groundwater quality and EPR water quality from EPR Outlet (from 2012 to 2014) <br />2. Hardness based WQS (Cd, Cu, Pb, Mn, Zn) for Segment 14 are calculated using a hardness of 100 mg/L <br />The modeled resulting water quality in the reservoir, shows concentrations of indicator <br />parameters well below surface water quality standards (i.e., no exceedance of standards). The <br />resulting predicted concentrations of cadmium, copper, and lead are lower than the starting <br />concentrations within the reservoir, and are likely the result of the sorption of these metals to <br />ferrihydrite precipitates as predicted by the geochemical modeling. <br />As a conservative sensitivity analysis, the model was also run with the model settings adjusted to <br />not allow or consider sorption. The results of this scenario are presented in Table 6. These model <br />results also show that concentrations of all indicator parameters remain well below surface water <br />quality standards within EPR. <br />Table 6. Results of Mixing Model - No Sorption <br />Iron <br />Sulfate <br />Zinc <br />Mixing Scenario <br />Cadmium <br />Copper <br />Di sI <br />Lead <br />Manganese <br />Molybdenum <br />s <br />Di ss <br />pH <br />Diss (mg/1) <br />Diss (mg/I) <br />Diss (mg/1) <br />Diss (mg/1) <br />Diss (mg/1) <br />Feld su <br />s <br />mg/1 <br />/I <br />Lake Volume = 1,077 ac-ft <br />Groundwater Flux = 10.9 ac-ft <br />0.0001 <br />0.003 <br />0.002 <br />0.001 <br />0.011 <br />0.058 <br />42 <br />0.035 <br />7.7 <br />Segment 14 Water Quality <br />Z <br />Acute <br />0.0027 <br />0.013 <br />0.30 (WS) <br />0.0646 <br />2.99 <br />0.16 <br />Standards <br />All lakes and reservoirs tributary <br />250 (WS) <br />6.5 - 9.0 <br />to the Eagle River except for <br />Chronic <br />0.00042 <br />0.009 <br />1.0 (Trec) <br />0.0025 <br />1.65 <br />0.160 (Trec) <br />0.12 <br />0.05 (WS) <br />specific listings in Segment 13 <br />Notes: <br />1. NFL values for groundwater quality and EPR water quality from EPR Outlet (from 2012 to 2014) <br />2. Hardness based WQS (Cd, Cu, Pb, Mn, Zn) for Segment 14 are calculated using a hardness of 100 mg1L <br />As discussed previously, NPLs for cadmium, copper, lead, and zinc are several orders of <br />magnitude greater than maximum observed concentrations, yet even at these extremely <br />conservative concentrations, and not considering the sorption of metals, predicted <br />concentrations for all indicator parameters in the reservoir remain below WQS. <br />Climax Molybdenum Company Page - 6 - <br />