Laserfiche WebLink
MWMC FACILITIES PLAN <br /> <br />further review. More restrictive future federal rules on SSOs will override the Oregon <br />regtdations. SSO requirements are a major driver for sigmificant future wet weather <br />improvements. Recommended future treatment tectmologies should include alternatives for <br />various combinations of SSO possibilities and blending techniques. <br /> <br />FIGURE 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 Plan, Eugene-Springfield <br /> <br /> 30.0 30.0 <br /> <br /> 25.0 ding~ 25.0 <br /> Required Reuse Flow to Meet Excess Thermal Lea <br /> <br /> 20.0 20.0 <br /> <br /> 7 ts.0 <br /> 15.0 ~-'-~- <br /> ~..4.- ~ ~-~ ~,~Projected Peak Week <br /> <br /> 10.0 10.0 <br /> <br /> [, <br /> 5.0 '~ 5.0 <br /> Permit Excess Thermal Load Limit <br /> <br /> 0.0 0.0 <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 />5-10 MWMC_5.0_REV8.DOC <br /> <br /> <br />