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The conclusion of this "calibration" effort described above is that in addition to the West <br /> Regional WWTF reaching its design capacity within the next two to three years , the <br /> North Regional WWTF should also be expanded to address the growing need for <br /> wastewater treatment in the north service area . Table 2 and the graphs below <br /> summarize the findings of the calibration effort for the North and Central WWTFs . <br /> Potential Flow Scenarios for the North and Central WWTFs <br /> (MGD AADF ) <br /> Table 2 <br /> 0-2 yr before 0-2 yr after Planning Horizon 3 <br /> Current im rovements4 improvements 2-5 yr 5- 10 yr2 20 r <br /> Total Vested Capacity 0 . 76 0. 76 0 . 76 0 . 76 0 . 76 0 . 76 <br /> North WWTF Flow <br /> ith vested and <br /> ransfer flows ' 0 . 35 0 . 42 1 . 5 1 . 5 1 . 5 3 . 5 <br /> entral WWTF Flow <br /> ith vested and <br /> ransfer flows ' 2 . 0 4 . 0 2 . 92 3. 22 3 . 72 3 . 84 <br /> North WWTF <br /> a aci 0 . 85 0 . 85 2 2 4 4 <br /> entral WWTF <br /> a city 2 4 4 4 4 4 <br /> North WWTF % of <br /> capacity 41 % 50% 75% 75 % 37% 88% <br /> rentral WWTF % of <br /> apacity 100% 100% 73% 80 % 93 % 96% <br /> ' Additional flow based on new subdivisions and ERUs identified in the January 2005 IRC Community <br /> Development Report with an estimate of completed subdivisions , individual occupied lots , and developed <br /> parcels according to IRC Metropolitan Planning Organization (MPO) deducted from the total number of <br /> ERUs . Flow based on IRC's wastewater level of service of 250 gpd/ERU noted in the March 17 , 1998 <br /> IRC 2020 Comprehensive Plan . <br /> 2 Flow not necessarily representative as the methodology for flow projections was based on short term <br /> data contained in the January 2005 IRC Community Development Report. Longer term planning is in <br /> progress based on historical information including new customer connections per month , plant flows , and <br /> building permits issued per month . <br /> 3 Planning horizon flow assumes flows return to master plan levels and all new flows occur in or are <br /> routed to the West Regional WWTF . If the current pace of growth and vested flows continues, the West <br /> Regional WWTF may need to be re-rated . It will be extremely important to monitor the pace of growth and <br /> the track vested flow versus actual flows seen in IRC 's facilities . <br /> 4 Plant situation if no improvements are made in 0 to 2 year horizon <br /> PW 7 IRC WWTF Expansion <br /> May 2005 <br />