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

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Presentation on theme: "Spokane River Forum 26 May 2013 Spokane’s CSO Reduction Status."— Presentation transcript:

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

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5 Treatment Plant wastewater CSO Regulator stormwater

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

7  33 outfalls  1000 average CSOs / year  550 avg million gallons / yr

8  24 outfalls  450 average CSOs / year  80 avg million gallons / yr

9 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).”

10  20 outfalls  280 average CSOs / year  70 avg million gallons / yr

11 CSO 16

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

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

21 CSO 3 4 CSO 18 CSO 40 CSO 39

22 4 CSO 41 CSO 34-3 CSO 33-2 Pending Integrated Plan CSO 34-3 Up-basin Tanks Pending Integrated Plan

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

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

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


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