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IRC is in the process of re-rating the South Regional WWTF which has the potential to <br /> add 0 . 25 - 0 . 50 MGD AADF of additional treatment to the combined service area , <br /> however, our approach does not assume this treatment is available and that the West <br /> Regional WWTF improvements will handle all new flows above the South Regional <br /> WWTF 's capacity of 2 . 0 MGD AADF . Any additional capacity gained at the South <br /> Regional WWTF would benefit the combined service area . <br /> Potential Flow Scenarios for the West and South WWTFs <br /> ( MGD AADF) <br /> Table 1 <br /> � <br /> Current w/ 0-2 yr before 0-2 yr after Plannin <br /> Horizon <br /> Current Transfer im rovements4 im rovements 2-5 r 5- 10 r 2 20 r <br /> Total Vested Capacity 0 . 60 0 . 60 0 . 60 0 . 60 0 . 60 0 . 60 0 . 60 <br /> West WWTF Flow <br /> with vested and <br /> transfer flows ' 1 . 17 1 . 95 1 . 92 2 . 52 4 . 11 4 . 18 5 . 67 <br /> South WWTF Flow <br /> with vested and <br /> transfer flows ' 1 . 9 1 . 15 1 . 96 1 . 36 1 . 78 1 . 83 1 . 83 <br /> West WWTF <br /> Capacity 2 2 2 3 6 6 6 <br /> South WWTF <br /> raaci 2 2 2 2 2 2 2 <br /> WWTF % of <br /> ci 60 . 0 % 97 . 5% 96 . 0 % 84 . 0% 68 . 5% 69 . 6% 94. 5% <br /> WWTF % of <br /> C' 95. 0 % 57 . 5% 98. 0 % 68 . 0 % 89. 1 % 91 . 3 % 91 . 3% <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 /> 3 IRC WWTF Expansion <br /> May 2005 <br />