7a Supp 2
Item No.:_ ______7a_Supp2_____ Date of Meeting: _December 7, 2010____ Magnolia Basin CSO Control Port of Seattle Commission December 7, 2010 1 Meeting Purpose Brief the Port Commission on King County's CSO control project in South Magnolia, siting and next steps 2 The Combined Sewer System Conveys wastewater & stormwater to treatment plants Pipelines & pump stations capture most of the flow, but capacity can be exceeded in storm events Relief points CSOs discharge when flows exceed capacity 3 What are the CSO Control Requirements? State Regulations require CSO overflows to be controlled to one event per year on average Department of Ecology deadlines are included in West Point Treatment Plant NPDES permit Ecology & EPA can enforce requirements with fines and court orders EPA is tracking King County's compliance schedule 4 Basin Description and Requirements 795 acres Magnolia CSOs Average 19 events per year Average 31 million gallons per year Control requirements 1.8 million gallons of storage 5 Project Timeline -- 2010 onward Spring 2010 Brief public, stakeholders on 3 alternatives Fall 2010 Identify proposal to carry forward for further design and environmental review December 31, 2010 Submit draft Facility Plan to Ecology Spring 2011 Environmental (SEPA) review & public comment 2012 - Complete plans and specifications 2013 Construction begins 6 Public Outreach 2010 Newsletter to residents of basin, with information on alternatives in March Updates to community and agencies Public meeting, Magnolia Community Center, March 23 Meeting with the Port's Neighbors Advisory Committee, October 20 7 Recommended Alternative: Alternative 1F1 Tank Option Size (To Scale) 8 During and After Construction Boeing Creek Park, Shoreline- Underground Flow Control Structure 9 Next Steps Continue to work with Port of Seattle and Seattle Parks on details of partnership Continue community outreach Make public announcement of the recommended project alternative by December 15, 2010 Continue to work with Port of Seattle and Seattle Parks to reach a decision on siting and tank configuration in first quarter 2011 10
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