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K Kennedy Jenks Geosyritec <br /> consultants <br /> Hybrid (Small Pump) Alternative: Treated <br /> 99.5 <br /> 98 i I <br /> a� <br /> 95- <br /> 90- <br /> 80- <br /> 0 <br /> 59080 O 70- <br /> W431 <br /> i I <br /> 60- <br /> X +� 50 i I <br /> w 300 I <br /> 0,L 20- <br /> 10- <br /> 5- <br /> 0 <br /> 0 10 5 0 <br /> 2- <br /> 0 <br /> i I <br /> d 0.5 Individual MC Result <br /> Mean MC Calculated <br /> 0 — <br /> 8E --— Benchmark <br /> NEL I <br /> 0.001 � <br /> 10-1 100 101 <br /> Total Copper Concentration, ug/L <br /> Figure 33: Probability of Total Copper exceedance on days with flow at the treatment system <br /> outflow structure(treated only)for the Hybrid(Small Pump)Alternative.Individual MC <br /> simulation results shown as gray points; the average all simulations per exceedance interval shown <br /> as a blue point. <br /> 5.4.3. Zinc Water Quality Exceedance <br /> The Hybrid(Small Pump)Alternative showed very good treatment system performance for Total <br /> Zinc over the course of the simulation. Concentrations at PMG1 exceeded the Copper NEL less <br /> than 0.2%, as shown in Figure 34. Treated water concentrations leaving the filter did not exceeded <br /> the Zinc NEL,as shown in Figure 36.As expected,the bypass location has approximately the same <br /> probability of exceeding the NEL as the untreated Existing Condition as Designed Alternative, <br /> however, the results show less confidence because of less days of flow from which to sample a <br /> concentration as shown in Figure 35. Overall,these results display a low risk of exceeding the Zinc <br /> NELs for the Hybrid(Small Pump)Alternative. <br /> Appendix B,Page 36 <br /> Privileged and Confidential Attorney-Client Work Product <br />