City of Cumberland, Maryland Combined Sewer Overflow (CSO) Program CSO Storage Facility – Phase 1 November 8, 2011 Outline City of Cumberland CSOs Cumberland CSO Program Project Phasing and Implementation Regulatory Status Phase I of CSO Storage Facility Components Phase 1 CSO Storage Facility Engineering 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 Storm Drain Separation & Urban Renewal (1975) Mill Race Improvements (2004) Long Term Control Plan (2006) Mechanic Street Sewer Study (2007) Evitts Creek Pump Station (2008) 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 CSO Storage Facility at WWTP Report – July 2011 MDE: • February 2011 • September 2011 • 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 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 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 Studies & Field Work Required • • • • Design Components • • • • • • • • 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 Estimated Construction Costs: $22 million Total Engineering $2.4 million Design ($1.5 million) Services During Construction ($0.9 million) Total Project Cost: $24.4 million Schedule 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