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Mr. Michael Grochala <br />April 8, 2020 <br />Page 6 <br /> <br /> <br />K:\015144-000\Admin\Docs\AUAR - Update 2020\Water Wastewater\MEMO - 040820 - Wastewater.docx <br />Table 9 summarizes the projected wastewater flow by MCES connection point under the 2030 <br />Comp Plan Scenario. Note that the flows listed in Table 9 include only additional flows generated <br />within the study area. <br /> <br />Table 9. Projected Additional Regional Wastewater Flow by MCES Connection Point for <br />2030 Comp Plan Scenario <br />MCES <br />Interceptor <br />City Sanitary <br />Sewer District <br />Average <br />Flow (MGD) <br />Peak Hourly <br />Flow (MGD) <br />7651 3 0.52 1.77 <br />802325 5 1.04 3.22 <br /> <br />Table 10 summarizes the projected wastewater characteristics and additional loading for the <br />wastewater that will be generated under the 2030 Comp Plan Scenario. <br /> <br />Table 10. Projected Wastewater Characteristics and Additional Total Average Daily <br />Wastewater Loading for 2030 Comp Plan Scenario <br />Parameter Concentration <br />(mg/L) <br />Average Load <br />(lbs/day) <br />Biochemical Oxygen Demand 220 2,873 <br />Total Suspended Solids 220 2,873 <br />Ammonia –Nitrogen 25 326 <br />Total Phosphorous 8 104 <br /> <br />Wastewater Projection Comparison <br />Table 11 summarizes the projected average wastewater flows from the 2005 Original AUAR and <br />this 2020 AUAR Update for the scenarios outlined above. The 2005 Original AUAR used flow <br />assumptions of 274 gpd/unit for residential development and 1,500 gpd/acre for commercial and <br />industrial development. The 2005 flow assumptions were very conservative, so the 2020 flow <br />assumptions used in this update have been revised to agree more closely with metered <br />wastewater flows from the last five years. <br /> <br />Table 11. Comparison of Average Wastewater Flow Projections <br />Scenario 2005 Original <br />AUAR <br />2020 AUAR <br />Update <br />Scenario 1 2.529 MGD 2.250 MGD <br />Scenario 2 3.646 MGD 2.436 MGD <br />Scenario 3 3.733 MGD N/A <br />2030 Comp Plan N/A 1.565 MGD <br /> <br />The projected wastewater flows have decreased in this update. Due to topography constraints, <br />the expansion and layout of the sanitary sewer system will generally conform to the layout <br />identified in the 2005 Original AUAR. However, the exact sizing of trunk facilities may be revised <br />based on the most current wastewater flow projections.