Spokane River Forum 23 May 2011
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Transcript of Spokane River Forum 23 May 2011
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Spokane River Forum 23 May 2011
CSO Reduction 2011 Status
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What is a CSO?
Treatment Plant
wastewater
CSO Regulator
stormwater
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Why do CSOs overflow?
StormwaterRunoff
Wastewater Flows
Time
Flow
Overflow Threshold
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CSO Regulator is an Overflow Threshold
Old style “Leaping Weir”
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CSO Reduction HistoryBaselineas of 1980
33 outfalls
1000 average CSOs / year
550 avg million gallons / yr
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CSO Reduction HistoryPhase 11980s storm separation
24 outfalls
450 average CSOs / year
80 avg million gallons / yr
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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
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CSO 16 Construction
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CSO 16 Tank
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CSO 16 Sump
... Tank Drains to Sewer After Storm
Tank Fills During Storm...
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CSO 16 Self-CleansAfter Tank Drains
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CSO 16 Self-Cleans After Tank Drains
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CSO 16 Self-Cleans After Tank Drains
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CSO 16 Site Restoration
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CSO 16 Monitoring & Cleaning Controls
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CSO Facilities Constructed
CSO 10
5
CSO 16
CSO 2
CSO 42
CSO 19
In Construction
Tank not required
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CSO Outfalls Eliminated
CSO 3
2
CSO 18
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Facilities In Final Design4
CSO 41
CSO 34-3
CSO 33-2
CSO 38/39/40Eliminates 2 outfalls
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Interim Weir Modifications
CSO 12
9
CSO 7
CSO 39
CSO 25
CSO 26CSO 14
CSO 6
CSO 15
CSO 40
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Weir Modification “Before”
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Weir Mods provide:
Less dry weather plugging
More response time
Improved monitoring
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Weir Modification“After”
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Weir Modification“After”
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CSO Reduction HistoryPhase 2
Storage Tanks by 2011
22 outfalls
350 average CSOs / year
70 avg million gallons / yr
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CSO Reduction HistoryPhase 2
2017 Projected Results
<20 outfalls
<20 average CSOs / year
<8 avg million gallons / yr