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K Kennedy Jenks <br /> Technical Memorandum <br /> Kyle Bringedahl, The Boeing Company <br /> 13 April 2021 <br /> KJ 2096009.00 <br /> Page 4 <br /> Table 1. Media Performance Summary <br /> Parameter Units Influent Effluent <br /> Turbidity NTU 3.4 2.9 <br /> Copper pg/L 2.6 1.7 <br /> Copper(Dissolved) pg/L 1.7 1.3 <br /> Zinc pg/L 49.1 3.0 <br /> Zinc (Dissolved) pg/L 41.0 3.0 <br /> 1.4.2 Hydrologic and Hydraulic Modeling <br /> Hydrologic and hydraulic modeling consisted of a long-term, continuous simulation using <br /> EPA SWMM5, which was selected for its capabilities in handling complex hydraulics. <br /> Monte-Carlo effluent concentration analysis was performed to estimate the probabilistic <br /> likelihood of compliance. Performance metrics are summarized in Table 2. <br /> Table 2. Design alternative performance metrics and definitions. <br /> Performance Metric Description <br /> The total volume of treated water(by the enhanced media filter and <br /> Capture Efficiency (%) wetlands)divided by the total volume of water released to Powder Mill <br /> Creek and the wetland for the 30-year model simulation period. <br /> Number of calendar days per year that water bypasses the enhanced <br /> Average Annual Bypass media filter. Expressed as a yearly average over the 30-year simulation. <br /> Days Does not describe duration or volume passed during bypass events. <br /> Note: Bypass water combines with treated flows from the enhanced <br /> media filter prior to discharge to Powder Mill Creek. <br /> Percentage of days, based on a 30-year simulation, that water bypasses <br /> Days with Bypass (%) the enhanced media filter. Note: Bypass water combines with treated <br /> flows from the enhanced media filter prior to discharge to Powder Mill <br /> Creek. <br /> Number of hours during which water bypasses the enhanced media <br /> Average Annual Bypass filter. Expressed as a yearly average over the 30-year simulation. Does <br /> Hours not describe volume passed during bypass events. Note: Bypass water <br /> combines with treated flows from the enhanced media filter prior to <br /> discharge to Powder Mill Creek. <br /> Probability of Meeting The probability, based on the Monte-Carlo analysis, of any single, <br /> NELs (%) random sample having a lower concentration of copper or zinc than the <br /> NEL <br /> 1\kjc.locallkjc-rootlkj-projectslfederalwayl202012096009.00 boeing everett sw treatment109-reports19.08-reports-tmslcity of everelt design tmlboeing everett sw design tech memo.docx ©Kennedy/Jenks Consultants, <br /> Inc. <br />