Spokane River Forum 23 May 2011

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Presentation transcript:

Spokane River Forum 23 May 2011 CSO Reduction 2011 Status Spokane River Forum 23 May 2011

What is a CSO? wastewater stormwater CSO Regulator Treatment Plant

Why do CSOs overflow? Flow Stormwater Runoff Overflow Threshold Wastewater Flows Time

CSO Regulator is an Overflow Threshold Old style “Leaping Weir”

CSO Reduction History Baseline as of 1980 33 outfalls 1000 average CSOs / year 550 avg million gallons / yr

CSO Reduction History Phase 1 1980s storm separation 24 outfalls 450 average CSOs / year 80 avg million gallons / yr

Spokane CSO Compliance - 2017 CSO Regulations Chapter 173-245 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).” Spokane CSO Compliance - 2017

CSO 16 Construction

CSO 16 Tank

CSO 16 Sump Tank Fills During Storm... ... Tank Drains to Sewer After Storm

CSO 16 Self-Cleans After Tank Drains

CSO 16 Self-Cleans After Tank Drains

CSO 16 Self-Cleans After Tank Drains

CSO 16 Site Restoration

CSO 16 Monitoring & Cleaning Controls

CSO Facilities Constructed 5 CSO Facilities Constructed CSO 2 CSO 10 In Construction CSO 42 CSO 16 CSO 19 Tank not required

CSO Outfalls Eliminated 2 CSO Outfalls Eliminated CSO 3 CSO 18

Facilities In Final Design 4 Facilities In Final Design CSO 38/39/40 Eliminates 2 outfalls CSO 41 CSO 33-2 CSO 34-3

Interim Weir Modifications 9 Interim Weir Modifications CSO 6 CSO 7 CSO 40 CSO 12 CSO 39 CSO 14 CSO 15 CSO 25 CSO 26

Weir Modification “Before”

Weir Mods provide: Less dry weather plugging More response time Improved monitoring

Weir Modification “After”

Weir Modification “After”

CSO Reduction History Phase 2 Storage Tanks by 2011 22 outfalls 350 average CSOs / year 70 avg million gallons / yr

CSO Reduction History Phase 2 2017 Projected Results <20 outfalls <20 average CSOs / year <8 avg million gallons / yr