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K Kennedy Jenks Geosyritec <br /> consultants <br /> TOTAL COPPER <br /> ■ Detention Basin Outlet ■ MC Analysis <br /> 100% <br /> LU 80% <br /> O <br /> m <br /> } 60% <br /> U <br /> Z <br /> `U <br /> 40% <br /> C� o <br /> W oo <br /> 20% o <br /> � <br /> r- 801 <br /> 0% rn <br /> ISGP NEL <br /> Figure 7: Comparison of Copper ISGP Benchmark and NEL exceedance between monitoring data <br /> (Detention Basin Outlet) and MC Analysis. <br /> 5.1.3. Zinc Water Quality Exceedance <br /> The Existing Condition as Designed showed very poor performance for Total Zinc of the over the <br /> simulation. Treated water does not mix with untreated water in this alternative,thus concentrations <br /> of water are always fully untreated. The Zinc NEL is exceeded approximately 18% of days with <br /> flow, or approximately 63 days a year, as shown in Figure 8. A comparison of the MC results to <br /> historic data collected in the last 10 years from the Bi-Annual Sampling Plan is shown in Figure 9 <br /> and show decent agreement. Like copper, the MC results show slightly less frequent exceedance <br /> likely due to not capturing the full natural variability of the data and recent source control measures <br /> skewing the distribution. <br /> Appendix B,Page 10 <br /> Privileged and Confidential Attorney-Client Work Product <br />