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M~C FACILITIES PLAN <br /> <br />further review. More restrictive future federal rules on SSOs will override the Oregon <br />regulations. SSO requirements are a major driver for significant future wet weather <br />improvements. Recommended future treatment tecl'mologies should include alternatives for <br />various combinations of SSO possibilities and blending techniques. <br /> <br />F~GURE 5.1.3-5 <br />Dry Season Peak Week Excess Thermal Load <br />Based on Existing Thermal Load Limitations and Projected Flows <br />MWMC Facilities P/an, Eugene-Springfield <br /> <br /> 30 0 30 0 <br /> <br /> 25 0 L~ /~'~ 25 0 <br /> Required Reuse Ftow to Meet Excess Thermal Loading <br /> <br />  20 0 20,0 <br /> ~5o ....... ~5o~ <br /> ~ 100 ~~ ............. 100 <br /> <br /> 50 - -50 <br /> Permit Excess Thermal Load Limit <br /> <br /> O0 - <br /> 2005 2010 2015 2020 2025 <br /> Year <br /> <br />Previous studies and collection system modeling efforts have concluded that peak wet <br />weather flows (PWWFs) resulting from the projected 2025 5-year 24-hour storm (which <br />equates to 3.9 inches of rain for the Eugene/Springfield area, derived from statistical <br />evaluation of precipitation data recorded at the Mahlon Sweet Airport) could be conveyed <br />by the collection system to the WPCF for treatment without SSOs. Collection system models <br />estimate the current PWWF in excess of 250 mgd, a situation that now results in SSOs. <br />Current PWWFs entering the treatment facility exceed 200 mgd, and are limited by the <br />influent pump station's ability to get flow into the plant. An increase in both peak flow <br />conveyance and treatment capacity is necessary to comply with DEQ's future requirement <br />that the wet season flow associated with the 5-year, 24-hour rainfall event be accommodated <br />by MWMC's facilities without resulting in SSOs. <br /> <br /> 5d 0 MWMC_50_REV8 DOC <br /> <br /> <br />