Sewer Overview

8/7/2019 Sewer Overview

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City of Lima, Ohio

CSO Progress Update for Council

March, 2011


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Lima sewer system overview

Regulatory Requirements

Sanitary Sewer Overflow (SSO) Component

Combined Sewer Overflow (CSO) Solutions

Regulatory Compliance Costs & Benefits


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Allentow

n Rd.

KoopRd.

15th

Street

LostCreek

ColeStreet

West

Street FindlayRoad

Lima, OHSeparate Sanitary


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Sewer System OverviewWhere does the water go?

Combined System

SurfaceRunoff

Gutters &Downspouts

Bathrooms, Showers,Laundry, Dishwashing, etc.

Footer

Drains

Roadway Runoff &Other Impervious

Surfaces(i.e. Parking Lots)

Combined Sewer

Industrial Wastewater


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Separate System

SurfaceRunoff

Gutters &Downspouts

Bathrooms,Showers, Laundry,Dishwashing, etc.

Footer

Drains

Roadway Runoff &Other Impervious

Surfaces(i.e. Parking Lots)

Sanitary Sewer

Industrial Wastewater

Storm Sewer


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Sewer Mains and Interceptors

NO FLOW

SeparatedSewer Area

CombinedSewer Area

WastewaterTreatment Plant

Manhole

Local Combined Sewer

InterceptingStructure

RegulatingStructure

Overflow Sewer

CSO

Interceptor Sewer

Local Sanitary Sewer

Storm Sewer


OutfallWWTP

Effluent


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DRY WEATHER FLOW

SeparatedSewer Area

CombinedSewer Area


Manhole



RegulatingStructure

Overflow Sewer

CSO

Interceptor Sewer


Storm Sewer


OutfallWWTP

Effluent


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WET WEATHER FLOW

SeparatedSewer Area

CombinedSewer Area


Manhole



RegulatingStructure

Overflow Sewer

CSO

Interceptor Sewer


Storm Sewer


OutfallWWTPEffluent


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EXTREME WET WEATHER FLOW

SeparatedSewer Area

CombinedSewer Area


Manhole



RegulatingStructure

Overflow Sewer

CSO

Interceptor Sewer


Storm Sewer


OutfallWWTPEffluent


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Limas system includes: 20 CSOs, 33 SSOs, 1 WWTP Currently no SSO policy dictating frequency ofoverflows

USEPAs CSO Policy Requires Controllingoverflows to 4 events/yearCSO activation may be greater based on affordabilitycriteria


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Allentow

n Rd.

KoopRd.

15th

Street

LostCreek

ColeStreet

West

Street FindlayRoad

Lima, OHSeparate Sanitary


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Total SSO Volumes by Design Storm Size

2.38 2.78 3.32 4.30


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BASIN 5-Yr 10-Yr 25-Yr 100-Yr

Lost Creek $4,098,000 $4,816,000 $5,592,000 $7,297,000West Street $3,028,000 $3,457,000 $4,352,000 $5,000,000

Koop Road $4,778,000 $5,407,000 $5,672,000 $6,794,000

Allentown Road $4,527,000 $5,021,000 $5,328,000 $5,842,000

Cole Street $1,717,000 $2,101,000 $2,288,000 $2,558,000

Findlay Road $1,483,000 $1,551,000 $2,727,000 $3,157,000

15th Street $190,000 $281,000 $506,000 $714,000

Total $19,821,000 $22,634,000 $26,465,000 $31,362,000

Total Estimated Project Costs to Provide Protection forthe Specified Design Storm (Aug 2009 Dollars)


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Implementation: 10 - 12 Year CIP Program


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WWTP Upgrade

CSO Storage Tank(s)

CSO Storage Tunnel

Sewer Separation


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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


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Category Rating Criteria Category Rating Criteria

1Cost is more than 5 times higher than the lowest

cost alternative1

Extremely elaborate O&M requirements, requires

additional staff or training; cannot be expanded or

retrofitted for additional CSO control; history of

significant maintenance problems

2Cost is more than 25% higher than the lowest

cost but less than 5 times higher

2

Moderately complex, requires general training; could

be expanded on a limited basis with some difficulty;

moderately reliable

3Lowest cost alternative or alternative cost is

within 25% of the lowest cost[3

Straight-forward to operate, limited training; could be

easily expanded or retrofitted; minimal maintenance

with proven track record

1Cannot meet CSO control goal without significant

additional improvements1

Specialty Construction Firms required, highest risk

construction methods

2Meets CSO control goal with minor additional

improvements2

Mix of Specialty and Conventional Construction Firms

required, moderate risk

3 Meets CSO control goal 3

Conventional Construction Firms can perform all

work, low risk

1Discharges the largest pollutant load into the

environment

2 Discharges pollutant load between 1 and 3

3Discharges the smallest pollutant load into the

environment

1

Extreme, sustained, widespread disruption to

community, large scale surface impacts that

interrupt traffic and cause extreme levels ofnoise, odor, vibration or other inconveniences;

would result in major public opposition; requires

extensive permitting approval process

2

Moderate levels of noise, odor, vibration or other

inconveniences; has no significant history of

opposition;

3

Minimal levels of noise, odor, vibration or other

inconveniences; embraced by impacted public;

normal permit review and approval process

Cost

Conformance

with Objectives

Environmental

Issues

Public Disruption

Operational

Issues

Constructability


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Alternative Cost

Conforman

cew

ith

Obj

ectiv

es

Environm

ental

Issu

es

Public

Dis

ruption

Ope

ratio

nalIss

ues

Constru

ctabilit

y

TOTAL Comments

1: Tank + 70 MGD 2 3 2 2 3 2 141) Tank is easier to maintain/clean because it is not as deep as tunnel, City

owns Simmons Field, site of the major tank

2: Tank + 96 MGD 3 3 3 2 3 2 16

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 MGDoption 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

3: Tunnel + 70 MGD 2 3 2 3 2 1 13

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

4: Tunnel + 96 MGD 3 3 3 3 2 1 15

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

5: Complete

Separation1 3 1 1 3 3 12

1) High levels of public disruption, less pollutant removal than all other

alternatives


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22


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*Capacity shown for each process in approximate peak flow

Baxter Pump Sta.(56 mgd)

Preliminary

(96 mgd)

Existing

Primaries(26 mgd)

NewPrimaries(40 mgd)

ActivatedSludge

(40 mgd)

Towers(30 mgd)

Cl2

(40 mgd)

54" (33 mgd)

72" (63 mgd)

36"(12 mgd)

96

26

40

Dry Weather

Tower Seed

ToRiver

40 mgd duringwet weather

Disinfection(56 mgd)

30

23


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24


Preliminary

(96 mgd)

Existing

Primaries(26 mgd)


ActivatedSludge

(40 mgd)

Towers(30 mgd)

Cl2

(40 mgd)

54" (33 mgd)

72" (63 mgd)

36"(12 mgd)

96

26

40

Dry WeatherTower Seed

ToRiver



30


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25


Preliminary

(96 mgd)

ExistingPrimaries(26 mgd)


ActivatedSludge

(40 mgd)

Towers(30 mgd)

Cl2

(40 mgd)

54" (33 mgd)

72" (63 mgd)

36"(12 mgd)

96

26

40


ToRiver



30


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26


Preliminary

(96 mgd)

ExistingPrimaries(26 mgd)


ActivatedSludge

(40 mgd)

Towers(30 mgd)

Cl2

(40 mgd)

54" (33 mgd)

72" (63 mgd)

36"(12 mgd)

96

26

40


ToRiver



30


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27


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Bypasses Definition Flow at WWTP receiving less than SecondaryTreatment

(will receive primary & disinfection)Anticipated Level

(subject to negotiations)9 events

0.6% of total flow99.4% of total combined flow will meet

Secondary

Note: Above based on typical year.

28


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131.7 MG 140.8 MG 18.1 MG 17.2 MG 0 2.3 MG

BaxterPS

WWTP

Kibby

Underground

Storage

Central

Underground

Storage

Collet

Underground

Lovers

LaneCentral

AveMcDonelHeindelCollet


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16.1 MG 15.8 MG 5.4 MG 7.8 MG 0 1.6 MG

BaxterPS

WWTP

Kibby

Underground

Storage

Central

Underground

Storage

Collet

Underground

Lovers

Lane

Central

Ave

McDonelHeindelCollet

Equalization

Tank

8 MG

0.6 MG

Storage

Tank


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Construction Cost ($M)

Alternative 1 CSO/Yr 2 CSOs/Yr 4 -5 CSOs/Yr 7 - 9 CSOs/Yr 12 CSOs/YrTotal 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


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Rehabilitation (Plant & Baxter) (Done 6/11) $11.0 million

Headworks, Primaries & Peak Wet Weather (96 mgd) $31.6 million*

Interceptor (96 mgd) $3.2 million**

Total $45.8 million

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* 53 mgd capacity $19.9 million (maintainexisting)

70 mgd capacity $30.0 million

** 53 mgd capacity $2.9 million(maintain existing)

70 mgd capacity $3.0 million


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SSO Control (5 year) $19.8M

CSO Control (7-9 CSOs) $49.8M

WWTP Expansion (96 MGD) $17.6M

Repair and Replacement $TBD

TOTAL $86.2M


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Cleaner Pike Run and Ottawa River

No CSOs to Pike Run on an annual basis

Significant Pollution Load Reduction

EPA Compliance


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Documents

Sewer Overview