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Background <br />,, <br />;. <br />l~ <br />,. , <br />In December 2000, the Metropolitan Wastewater Management Commission published a <br />comprehensive Wet Weather Flow Management Plan (WWFMP) for the wastewater <br />collection and treatment facilities in the Eugene/Springfield, Oregon metropolitan area. The <br />plan evaluated four technologies to manage excess wet weather flow relative to performance, <br />cost, and political and community acceptance. The four technologies included (1) system <br />rehabilitation to control rainfall derived infiltration and inflow (RDII); (2) in-line and off-line <br />storage of peak flows; (3) additional conveyance (including greater pipe conveyance and <br />pump station capacity); and (4) additional capacity to treat peak flows at the Eugene <br />Springfield Water Pollution Control Facility (E/S WPCF). Recommendations of the plan <br />included public system rehabilitation, system pumping facility upgrades, and additional <br />primary treatment capacity ofwet-weather peak flows. <br />The WWFMP outlined specific objectives, by sub-basin, for system rehabilitation, in the <br />public right-of--way only, to reduce RDII. Initial stages were to occur immediately. Later <br />stages would be refined to incorporate information gained during implementation of initial <br />stages and further data gathering. This report summarizes the review and documents the <br />findings of pre verses post system rehabilitation and the initial effectiveness of RDII removal. <br /> <br />