Sewer Overview
Content
City of Lima, Ohio CSO Progress Update for Council
March, 2011
Lima sewer system overview Regulatory Requirements Sanitary Sewer Overflow (SSO) Component Combined Sewer Overflow (CSO) Solutions Regulatory Compliance Costs & Benefits
Allentow n Rd.
Cole Street
West Street
Findlay Road
Koop Rd.
Lost Creek 15th Street
Lima, OH Separate Sanitary Sewer Basins
Sewer System Overview
Where does the water go? Combined System
Roadway Runoff & Other Impervious Surfaces (i.e. Parking Lots)
Gutters & Downspouts
Surface Runoff
Footer Drains
Bathrooms, Showers, Laundry, Dishwashing, etc.
Industrial Wastewater
Combined Sewer
Sewer System Overview
Where does the water go? Separate System
Roadway Runoff & Other Impervious Surfaces (i.e. Parking Lots)
Gutters & Downspouts
Surface Runoff
Footer Drains
Bathrooms, Showers, Laundry, Dishwashing, etc. Storm Sewer Sanitary Sewer
Industrial Wastewater
Sewer System Overview
Where does the water go? Sewer Mains and Interceptors
Overflow Sewer
Outfall Storm Sewer
Manhole
Intercepting Structure WWTP Effluent CSO
Local Sanitary Sewer Local Combined Sewer
Separated Sewer Area
Intercepting Structure
Interceptor Sewer
Combined Sewer Area
Regulating Structure
Wastewater Treatment Plant
NO FLOW
Sewer System Overview
Where does the water go? Sewer Mains and Interceptors
Overflow Sewer
Outfall Storm Sewer
Manhole
Intercepting Structure WWTP Effluent CSO
Local Sanitary Sewer Local Combined Sewer
Separated Sewer Area
Intercepting Structure
Interceptor Sewer
Combined Sewer Area
Regulating Structure
Wastewater Treatment Plant
DRY WEATHER FLOW
Sewer System Overview
Where does the water go? Sewer Mains and Interceptors
Overflow Sewer
Outfall Storm Sewer
Manhole
Intercepting Structure WWTP Effluent CSO
Local Sanitary Sewer Local Combined Sewer
Separated Sewer Area
Intercepting Structure
Interceptor Sewer
Combined Sewer Area
Regulating Structure
Wastewater Treatment Plant
WET WEATHER FLOW
Sewer System Overview
Where does the water go? Sewer Mains and Interceptors
Overflow Sewer
Outfall Storm Sewer
Manhole
Intercepting Structure WWTP Effluent CSO
Local Sanitary Sewer Local Combined Sewer
Separated Sewer Area
Intercepting Structure
Interceptor Sewer
Combined Sewer Area
Regulating Structure
Wastewater Treatment Plant
EXTREME WET WEATHER FLOW
Lima sewer system overview Regulatory Requirements Sanitary Sewer Overflow (SSO) Component Combined Sewer Overflow (CSO) Solutions Regulatory Compliance Costs & Benefits
Lima’s system includes: 20 CSOs, 33 SSOs, 1 WWTP Currently no SSO policy dictating frequency of overflows USEPA’s CSO Policy Requires Controlling overflows to 4 events/year CSO activation may be greater based on affordability criteria
Lima sewer system overview Regulatory Requirements Sanitary Sewer Overflow (SSO) Component Combined Sewer Overflow (CSO) Solutions Regulatory Compliance Costs & Benefits
Allentow n Rd.
Cole Street
West Street
Findlay Road
Koop Rd.
Lost Creek 15th Street
Lima, OH Separate Sanitary Sewer Basins
Total SSO Volumes by Design Storm Size
2.38”
2.78”
3.32”
4.30”
Total Estimated Project Costs to Provide Protection for the Specified Design Storm (Aug 2009 Dollars)
BASIN Lost Creek West Street Koop Road Allentown Road Cole Street Findlay Road 15th Street Total 5-Yr $4,098,000 $3,028,000 $4,778,000 $4,527,000 $1,717,000 $1,483,000 $190,000 $19,821,000 10-Yr $4,816,000 $3,457,000 $5,407,000 $5,021,000 $2,101,000 $1,551,000 $281,000 $22,634,000 25-Yr $5,592,000 $4,352,000 $5,672,000 $5,328,000 $2,288,000 $2,727,000 $506,000 $26,465,000 100-Yr $7,297,000 $5,000,000 $6,794,000 $5,842,000 $2,558,000 $3,157,000 $714,000 $31,362,000
Implementation: 10 - 12 Year CIP Program
Lima sewer system overview Regulatory Requirements Sanitary Sewer Overflow (SSO) Component Combined Sewer Overflow (CSO) Solutions Regulatory Compliance Costs & Benefits
WWTP Upgrade CSO Storage Tank(s) CSO Storage Tunnel Sewer Separation
WWTP capacity was compared with CSO storage needs (either tank or tunnel) upstream to determine cost-effective treatment/storage balance Two main WWTP options were considered:
70 MGD Capacity 96 MGD Capacity
Category
Rating 1
Criteria Cost is more than 5 times higher than the lowest cost alternative Cost is more than 25% higher than the lowest cost but less than 5 times higher Lowest cost alternative or alternative cost is within 25% of the lowest cost[ Cannot meet CSO control goal without significant additional improvements Meets CSO control goal with minor additional improvements Meets CSO control goal Discharges the largest pollutant load into the environment Discharges pollutant load between 1 and 3 Discharges the smallest pollutant load into the environment Extreme, sustained, widespread disruption to community, large scale surface impacts that interrupt traffic and cause extreme levels of noise, odor, vibration or other inconveniences; would result in major public opposition; requires extensive permitting approval process Moderate levels of noise, odor, vibration or other inconveniences; has no significant history of opposition; Minimal levels of noise, odor, vibration or other inconveniences; embraced by impacted public; normal permit review and approval process
Category
Rating 1
Cost
2
Operational Issues
2
Criteria Extremely elaborate O&M requirements, requires additional staff or training; cannot be expanded or retrofitted for additional CSO control; history of significant maintenance problems Moderately complex, requires general training; could be expanded on a limited basis with some difficulty; moderately reliable Straight-forward to operate, limited training; could be easily expanded or retrofitted; minimal maintenance with proven track record Specialty Construction Firms required, highest risk construction methods Mix of Specialty and Conventional Construction Firms required, moderate risk Conventional Construction Firms can perform all work, low risk
3
3
1 Conformance with Objectives 2 3 1 Environmental Issues 2 3
1 Constructability 2 3
1
Public Disruption 2
3
Alternative 1: Tank + 70 MGD
on fo rm O an bj c ec e tiv wit En es h vi ro nm en Pu ta bl lI ic ss D ue is s O ru pe pt ra io ti o n na C on lI ss st ue ru ct s ab i li ty
3 2 2 3 2 14 3 3 2 3 2 16 3 2 3 2 1 13 3 3 3 2 1 15 3 1 1 3 3 12
os t
TOTAL
2
Comments 1) Tank is easier to maintain/clean because it is not as deep as tunnel, City owns Simmons Field, site of the major tank 1) Tank is easier to maintain/clean because it is not as deep as tunnel 2) More annual volume will receive primary + disinfection than the 70 MGD option since corresponding volume will overflow at CSOs and receive treatment by fine screens but no disinfection. 3) City owns Simmons Field, site of major tank 1) Tunnel construction has more risk, deep dewatering pump staiton will be harder to maintain/service than tank pump station 2) Specialty contractor will be needed to perform work 1) Tunnel construction has more risk, deep dewatering pump station will be harder to maintain/service than tank pump station 2) More annual volume will receive primary + disinfection than the 70 MGD option since corresponding volume will overflow at CSOs and receive treatment by fine screens but no disinfection. 3) Specialty contractor will be needed to perform work 1) High levels of public disruption, less pollutant removal than all other alternatives
C
3 2 3 1
2: Tank + 96 MGD
3: Tunnel + 70 MGD
4: Tunnel + 96 MGD
5: Complete Separation
C
22
Baxter Pump Sta. (56 mgd)
26
Existing Primaries (26 mgd)
Disinfection (56 mgd)
36" (12 mgd) 54" (33 mgd)
72" (63 mgd)
Preliminary 96 (96 mgd)
30
40
New Primaries (40 mgd)
Activated Sludge (40 mgd)
Dry Weather Tower Seed
Towers (30 mgd)
40 mgd during wet weather
Cl2 (40 mgd)
To River
*Capacity shown for each process in approximate peak flow
23
Baxter Pump Sta. (56 mgd)
26
Existing Primaries (26 mgd)
Disinfection (56 mgd)
36" (12 mgd) 54" (33 mgd)
72" (63 mgd)
Preliminary 96 (96 mgd)
30
40
New Primaries (40 mgd)
Activated Sludge (40 mgd)
Dry Weather Tower Seed
Towers (30 mgd)
40 mgd during wet weather
Cl2 (40 mgd)
To River
*Capacity shown for each process in approximate peak flow
24
Baxter Pump Sta. (56 mgd)
26
Existing Primaries (26 mgd)
Disinfection (56 mgd)
36" (12 mgd) 54" (33 mgd)
72" (63 mgd)
Preliminary 96 (96 mgd)
30
40
New Primaries (40 mgd)
Activated Sludge (40 mgd)
Dry Weather Tower Seed
Towers (30 mgd)
40 mgd during wet weather
Cl2 (40 mgd)
To River
*Capacity shown for each process in approximate peak flow
25
Baxter Pump Sta. (56 mgd)
26
Existing Primaries (26 mgd)
Disinfection (56 mgd)
36" (12 mgd) 54" (33 mgd)
72" (63 mgd)
Preliminary 96 (96 mgd)
30
40
New Primaries (40 mgd)
Activated Sludge (40 mgd)
Dry Weather Tower Seed
Towers (30 mgd)
40 mgd during wet weather
Cl2 (40 mgd)
To River
*Capacity shown for each process in approximate peak flow
26
27
“Bypasses” Definition
Flow at WWTP receiving less than Secondary Treatment (will receive primary & disinfection) 9 events 0.6% of total flow 99.4% of total combined flow will meet Secondary
Anticipated Level (subject to negotiations)
Note: Above based on “typical” year.
28
Collet Underground Baxter PS
131.7 MG
140.8 MG
18.1 MG
17.2 MG 0
2.3 MG
Collet WWTP
Heindel
McDonel
Central Ave
Lovers Lane
Kibby Underground Storage
Central Underground Storage
Collet Underground Baxter PS
16.1 MG
15.8 MG
5.4 MG Central Ave
7.8 MG 0
1.6 MG
Collet WWTP Equalization Tank 8 MG
Heindel
McDonel
Storage Tank 0.6 MG
Lovers Lane
Kibby Underground Storage
Central Underground Storage
Lima sewer system overview Regulatory Requirements Sanitary Sewer Overflow (SSO) Component Combined Sewer Overflow (CSO) Solutions Regulatory Compliance Costs & Benefits
Construction Cost ($M)
Alternative
1 CSO/Yr
2 CSOs/Yr
4 -5 CSOs/Yr 7 - 9 CSOs/Yr
12 CSOs/Yr Total Sewer Separation
Tank + 96 MGD At Plant
$140.90
$79.90
$62.10
$49.00
$46.00 $417.00
Tunnel + 96 MGD At Plant
$90.60
$57.10
$49.80
$44.50
$43.30
Rehabilitation (Plant & Baxter) (Done 6/11) Headworks, Primaries & Peak Wet Weather (96 mgd) Interceptor (96 mgd) Total
*
$11.0 million $31.6 million* $3.2 million** $45.8 million
53 mgd capacity $19.9 million (maintain existing) 70 mgd capacity $30.0 million ** 53 mgd capacity $2.9 million (maintain existing) 70 mgd capacity $3.0 million
36
SSO Control (5 year) CSO Control (7-9 CSOs) WWTP Expansion (96 MGD) Repair and Replacement TOTAL
$19.8M $49.8M $17.6M $TBD $86.2M
Cleaner Pike Run and Ottawa River No CSOs to Pike Run on an annual basis Significant Pollution Load Reduction EPA Compliance
March, 2011
Lima sewer system overview Regulatory Requirements Sanitary Sewer Overflow (SSO) Component Combined Sewer Overflow (CSO) Solutions Regulatory Compliance Costs & Benefits
Allentow n Rd.
Cole Street
West Street
Findlay Road
Koop Rd.
Lost Creek 15th Street
Lima, OH Separate Sanitary Sewer Basins
Sewer System Overview
Where does the water go? Combined System
Roadway Runoff & Other Impervious Surfaces (i.e. Parking Lots)
Gutters & Downspouts
Surface Runoff
Footer Drains
Bathrooms, Showers, Laundry, Dishwashing, etc.
Industrial Wastewater
Combined Sewer
Sewer System Overview
Where does the water go? Separate System
Roadway Runoff & Other Impervious Surfaces (i.e. Parking Lots)
Gutters & Downspouts
Surface Runoff
Footer Drains
Bathrooms, Showers, Laundry, Dishwashing, etc. Storm Sewer Sanitary Sewer
Industrial Wastewater
Sewer System Overview
Where does the water go? Sewer Mains and Interceptors
Overflow Sewer
Outfall Storm Sewer
Manhole
Intercepting Structure WWTP Effluent CSO
Local Sanitary Sewer Local Combined Sewer
Separated Sewer Area
Intercepting Structure
Interceptor Sewer
Combined Sewer Area
Regulating Structure
Wastewater Treatment Plant
NO FLOW
Sewer System Overview
Where does the water go? Sewer Mains and Interceptors
Overflow Sewer
Outfall Storm Sewer
Manhole
Intercepting Structure WWTP Effluent CSO
Local Sanitary Sewer Local Combined Sewer
Separated Sewer Area
Intercepting Structure
Interceptor Sewer
Combined Sewer Area
Regulating Structure
Wastewater Treatment Plant
DRY WEATHER FLOW
Sewer System Overview
Where does the water go? Sewer Mains and Interceptors
Overflow Sewer
Outfall Storm Sewer
Manhole
Intercepting Structure WWTP Effluent CSO
Local Sanitary Sewer Local Combined Sewer
Separated Sewer Area
Intercepting Structure
Interceptor Sewer
Combined Sewer Area
Regulating Structure
Wastewater Treatment Plant
WET WEATHER FLOW
Sewer System Overview
Where does the water go? Sewer Mains and Interceptors
Overflow Sewer
Outfall Storm Sewer
Manhole
Intercepting Structure WWTP Effluent CSO
Local Sanitary Sewer Local Combined Sewer
Separated Sewer Area
Intercepting Structure
Interceptor Sewer
Combined Sewer Area
Regulating Structure
Wastewater Treatment Plant
EXTREME WET WEATHER FLOW
Lima sewer system overview Regulatory Requirements Sanitary Sewer Overflow (SSO) Component Combined Sewer Overflow (CSO) Solutions Regulatory Compliance Costs & Benefits
Lima’s system includes: 20 CSOs, 33 SSOs, 1 WWTP Currently no SSO policy dictating frequency of overflows USEPA’s CSO Policy Requires Controlling overflows to 4 events/year CSO activation may be greater based on affordability criteria
Lima sewer system overview Regulatory Requirements Sanitary Sewer Overflow (SSO) Component Combined Sewer Overflow (CSO) Solutions Regulatory Compliance Costs & Benefits
Allentow n Rd.
Cole Street
West Street
Findlay Road
Koop Rd.
Lost Creek 15th Street
Lima, OH Separate Sanitary Sewer Basins
Total SSO Volumes by Design Storm Size
2.38”
2.78”
3.32”
4.30”
Total Estimated Project Costs to Provide Protection for the Specified Design Storm (Aug 2009 Dollars)
BASIN Lost Creek West Street Koop Road Allentown Road Cole Street Findlay Road 15th Street Total 5-Yr $4,098,000 $3,028,000 $4,778,000 $4,527,000 $1,717,000 $1,483,000 $190,000 $19,821,000 10-Yr $4,816,000 $3,457,000 $5,407,000 $5,021,000 $2,101,000 $1,551,000 $281,000 $22,634,000 25-Yr $5,592,000 $4,352,000 $5,672,000 $5,328,000 $2,288,000 $2,727,000 $506,000 $26,465,000 100-Yr $7,297,000 $5,000,000 $6,794,000 $5,842,000 $2,558,000 $3,157,000 $714,000 $31,362,000
Implementation: 10 - 12 Year CIP Program
Lima sewer system overview Regulatory Requirements Sanitary Sewer Overflow (SSO) Component Combined Sewer Overflow (CSO) Solutions Regulatory Compliance Costs & Benefits
WWTP Upgrade CSO Storage Tank(s) CSO Storage Tunnel Sewer Separation
WWTP capacity was compared with CSO storage needs (either tank or tunnel) upstream to determine cost-effective treatment/storage balance Two main WWTP options were considered:
70 MGD Capacity 96 MGD Capacity
Category
Rating 1
Criteria Cost is more than 5 times higher than the lowest cost alternative Cost is more than 25% higher than the lowest cost but less than 5 times higher Lowest cost alternative or alternative cost is within 25% of the lowest cost[ Cannot meet CSO control goal without significant additional improvements Meets CSO control goal with minor additional improvements Meets CSO control goal Discharges the largest pollutant load into the environment Discharges pollutant load between 1 and 3 Discharges the smallest pollutant load into the environment Extreme, sustained, widespread disruption to community, large scale surface impacts that interrupt traffic and cause extreme levels of noise, odor, vibration or other inconveniences; would result in major public opposition; requires extensive permitting approval process Moderate levels of noise, odor, vibration or other inconveniences; has no significant history of opposition; Minimal levels of noise, odor, vibration or other inconveniences; embraced by impacted public; normal permit review and approval process
Category
Rating 1
Cost
2
Operational Issues
2
Criteria Extremely elaborate O&M requirements, requires additional staff or training; cannot be expanded or retrofitted for additional CSO control; history of significant maintenance problems Moderately complex, requires general training; could be expanded on a limited basis with some difficulty; moderately reliable Straight-forward to operate, limited training; could be easily expanded or retrofitted; minimal maintenance with proven track record Specialty Construction Firms required, highest risk construction methods Mix of Specialty and Conventional Construction Firms required, moderate risk Conventional Construction Firms can perform all work, low risk
3
3
1 Conformance with Objectives 2 3 1 Environmental Issues 2 3
1 Constructability 2 3
1
Public Disruption 2
3
Alternative 1: Tank + 70 MGD
on fo rm O an bj c ec e tiv wit En es h vi ro nm en Pu ta bl lI ic ss D ue is s O ru pe pt ra io ti o n na C on lI ss st ue ru ct s ab i li ty
3 2 2 3 2 14 3 3 2 3 2 16 3 2 3 2 1 13 3 3 3 2 1 15 3 1 1 3 3 12
os t
TOTAL
2
Comments 1) Tank is easier to maintain/clean because it is not as deep as tunnel, City owns Simmons Field, site of the major tank 1) Tank is easier to maintain/clean because it is not as deep as tunnel 2) More annual volume will receive primary + disinfection than the 70 MGD option since corresponding volume will overflow at CSOs and receive treatment by fine screens but no disinfection. 3) City owns Simmons Field, site of major tank 1) Tunnel construction has more risk, deep dewatering pump staiton will be harder to maintain/service than tank pump station 2) Specialty contractor will be needed to perform work 1) Tunnel construction has more risk, deep dewatering pump station will be harder to maintain/service than tank pump station 2) More annual volume will receive primary + disinfection than the 70 MGD option since corresponding volume will overflow at CSOs and receive treatment by fine screens but no disinfection. 3) Specialty contractor will be needed to perform work 1) High levels of public disruption, less pollutant removal than all other alternatives
C
3 2 3 1
2: Tank + 96 MGD
3: Tunnel + 70 MGD
4: Tunnel + 96 MGD
5: Complete Separation
C
22
Baxter Pump Sta. (56 mgd)
26
Existing Primaries (26 mgd)
Disinfection (56 mgd)
36" (12 mgd) 54" (33 mgd)
72" (63 mgd)
Preliminary 96 (96 mgd)
30
40
New Primaries (40 mgd)
Activated Sludge (40 mgd)
Dry Weather Tower Seed
Towers (30 mgd)
40 mgd during wet weather
Cl2 (40 mgd)
To River
*Capacity shown for each process in approximate peak flow
23
Baxter Pump Sta. (56 mgd)
26
Existing Primaries (26 mgd)
Disinfection (56 mgd)
36" (12 mgd) 54" (33 mgd)
72" (63 mgd)
Preliminary 96 (96 mgd)
30
40
New Primaries (40 mgd)
Activated Sludge (40 mgd)
Dry Weather Tower Seed
Towers (30 mgd)
40 mgd during wet weather
Cl2 (40 mgd)
To River
*Capacity shown for each process in approximate peak flow
24
Baxter Pump Sta. (56 mgd)
26
Existing Primaries (26 mgd)
Disinfection (56 mgd)
36" (12 mgd) 54" (33 mgd)
72" (63 mgd)
Preliminary 96 (96 mgd)
30
40
New Primaries (40 mgd)
Activated Sludge (40 mgd)
Dry Weather Tower Seed
Towers (30 mgd)
40 mgd during wet weather
Cl2 (40 mgd)
To River
*Capacity shown for each process in approximate peak flow
25
Baxter Pump Sta. (56 mgd)
26
Existing Primaries (26 mgd)
Disinfection (56 mgd)
36" (12 mgd) 54" (33 mgd)
72" (63 mgd)
Preliminary 96 (96 mgd)
30
40
New Primaries (40 mgd)
Activated Sludge (40 mgd)
Dry Weather Tower Seed
Towers (30 mgd)
40 mgd during wet weather
Cl2 (40 mgd)
To River
*Capacity shown for each process in approximate peak flow
26
27
“Bypasses” Definition
Flow at WWTP receiving less than Secondary Treatment (will receive primary & disinfection) 9 events 0.6% of total flow 99.4% of total combined flow will meet Secondary
Anticipated Level (subject to negotiations)
Note: Above based on “typical” year.
28
Collet Underground Baxter PS
131.7 MG
140.8 MG
18.1 MG
17.2 MG 0
2.3 MG
Collet WWTP
Heindel
McDonel
Central Ave
Lovers Lane
Kibby Underground Storage
Central Underground Storage
Collet Underground Baxter PS
16.1 MG
15.8 MG
5.4 MG Central Ave
7.8 MG 0
1.6 MG
Collet WWTP Equalization Tank 8 MG
Heindel
McDonel
Storage Tank 0.6 MG
Lovers Lane
Kibby Underground Storage
Central Underground Storage
Lima sewer system overview Regulatory Requirements Sanitary Sewer Overflow (SSO) Component Combined Sewer Overflow (CSO) Solutions Regulatory Compliance Costs & Benefits
Construction Cost ($M)
Alternative
1 CSO/Yr
2 CSOs/Yr
4 -5 CSOs/Yr 7 - 9 CSOs/Yr
12 CSOs/Yr Total Sewer Separation
Tank + 96 MGD At Plant
$140.90
$79.90
$62.10
$49.00
$46.00 $417.00
Tunnel + 96 MGD At Plant
$90.60
$57.10
$49.80
$44.50
$43.30
Rehabilitation (Plant & Baxter) (Done 6/11) Headworks, Primaries & Peak Wet Weather (96 mgd) Interceptor (96 mgd) Total
*
$11.0 million $31.6 million* $3.2 million** $45.8 million
53 mgd capacity $19.9 million (maintain existing) 70 mgd capacity $30.0 million ** 53 mgd capacity $2.9 million (maintain existing) 70 mgd capacity $3.0 million
36
SSO Control (5 year) CSO Control (7-9 CSOs) WWTP Expansion (96 MGD) Repair and Replacement TOTAL
$19.8M $49.8M $17.6M $TBD $86.2M
Cleaner Pike Run and Ottawa River No CSOs to Pike Run on an annual basis Significant Pollution Load Reduction EPA Compliance
