City of Cumberland, Maryland
Combined Sewer Overflow (CSO) Program
CSO Storage Facility – Phase 1
November 8, 2011
Outline
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City of Cumberland CSOs
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Cumberland CSO Program
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Project Phasing and Implementation
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Regulatory Status
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Phase I of CSO Storage Facility Components
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Phase 1 CSO Storage Facility Engineering
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Costs and Schedule
What Happens During a CSO?
Raw Sewage
mixed with rain
water spills into
an outfall and
out to the
Potomac River
Adapted from City of Bremerton
Overview
OverviewMap
Map and CSO Outfall Locations
N
Mill Race
Screening
Facility
Evitt’s Creek
Pump
Station
C&O Canal & Towpath
Cumberland
WWTP
CSO Percentage
by Volume
Overview
Map
11%
N
Mill Race
Screening
Facility
49%
Evitt’s Creek
Pump
Station
40%
C&O Canal & Towpath
Cumberland
WWTP
CSO Percentage
by Volume
Overview
Map
11%
N
Mill Race
Screening
Facility
49%
Evitt’s Creek
Pump
Station
40%
C&O Canal & Towpath
Since 2005 ~ 500 million
gallons of combined
sewer overflows occurred
at WWTP location
Cumberland
WWTP
Cumberland’s CSO Control Program
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Storm Drain Separation & Urban Renewal (1975)
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Mill Race Improvements (2004)
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Long Term Control Plan (2006)
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Mechanic Street Sewer Study (2007)
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Evitts Creek Pump Station (2008)
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Evitts Forcemain & Gravity Sewer (2010)

CSO Storage Facility
Overview
Cumberland’s
Map CSO Control Program
N
Mechanic
Street Sewer
Study
Mill Race
Improvements
Evitts
Forcemain
and Gravity
Sewer
CSO Storage
Facility Phase1
Evitt’s Creek
Pump
Station
Overview
Cumberland’s
Map CSO Control Program
Phase 4:
Evaluation of
Remaining Outfalls
N
Phase 2:
Pipeline from
Mill Race
Phase 1: CSO
Storage Facility
Phase 3: CSO
Storage Facility
Regulatory Status
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CSO Storage Facility at
WWTP Report – July 2011
MDE:
•
February 2011
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September 2011
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Acceptance of the CSO Storage
Facility at WWTP Report
October 14, 2011

•
Agreement to design criteria, sizing
approach and project phasing
Funding letter
October 24, 2011

Go-ahead for project

Begin date as November 2011
Phase 1 CSO Storage Facility
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Smallest Volume for highest
capture of WWTP CSO’s
5 MGal facility
Adjacent to WWTP
Below-Grade
Will capture on average 80% of
overflows at the WWTP
Facility adaptable for either
additional storage or treatment
for Phase II
CSO Storage Facility
Basketball/Recreational Courts
To WWTP
From Existing Overflow
Chamber at WWTP
5 MG Storage Facility
195 feet x 195 feet x 20 feet
CSO Pumping Station
WWTP
CSO Storage Facility Layout and
Components
Design Features
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Cast-in-Place CSO Storage
Facility
Below grade with at-grade
access
Dewatering, sheeting and
shoring during construction
CSO Pumping Station
Electric Building
Ventilation System and Odor
Control
Instrumentation and SCADA
Integration
Junction Structure
Screening Facility
Forcemain
Gravity Sewer Piping
Water Service
Phase I Engineering
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Studies & Field Work Required
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Design Components
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Surveys
Geotechnical Explorations
Environmental Investigations
Test Pits
Civil
Mechanical
Electrical
Instrumentation
Structural
Architectural
Advertising and Bidding Services
Permitting
Estimated Design Duration: 18 months
Projected Project Costs for Phase I
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Estimated Construction Costs:
$22 million
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Total Engineering
$2.4 million
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Design ($1.5 million)
Services During Construction ($0.9 million)
Total Project Cost:
$24.4 million
Schedule
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April 2015
May 2013
Nov 2011
Design (18 months)
Advertise,
Bid, and
Award (6 mo)
Construction (18 months)
Notice to Proceed – November 2011
Completion April 2015
Questions