Spokane River Forum 26 May 2013 Spokane’s CSO Reduction Status.

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Presentation transcript:

Spokane River Forum 26 May 2013 Spokane’s CSO Reduction Status

Treatment Plant wastewater CSO Regulator stormwater

Combined Sewage Wastewater Flow Time Flow Overflow Threshold Overflows to River Treated at RPWRF

 33 outfalls  1000 average CSOs / year  550 avg million gallons / yr

 24 outfalls  450 average CSOs / year  80 avg million gallons / yr

Chapter WAC: Frequency: “… control of each CSO such that an average of one untreated discharge may occur per year.” – Applied to each outfall Water Quality: “CSOs shall not violate water quality standards in receiving waters (numeric standards or the beneficial uses).”

 20 outfalls  280 average CSOs / year  70 avg million gallons / yr

CSO 16

... Tank Drains to Sewer After Storm Tank Fills During Storm...

CSO 10 8 CSO 16/18 CSO 2/3 CSO 40 CSO 19 CSO 39 CSO 42 CSO 38

CSO 3 4 CSO 18 CSO 40 CSO 39

4 CSO 41 CSO 34-3 CSO 33-2 Pending Integrated Plan CSO 34-3 Up-basin Tanks Pending Integrated Plan

CSO 12 7 CSO 7 CSO 25 CSO 26 CSO 14 CSO 6 CSO 15

 Less dry weather plugging  More response time  Improved monitoring

 Prioritize CSO volume reduction  Compliance: 20-year vs. 5-year  “Green” and “Gray” solutions