1 The fully constructed combined sewer overflow (CSO) program will reduce CSOs by 96% and over 98% in the Anacostia River alone, relieve flooding in northeast DC, and is part of the strategy of reducing nitrogen into the Potomac. Clean Rivers Project by Donal Barron

2 Clean Rivers Project (Long Term Control Plan) Overview  20-year program totaling $2.6 billion  Control combined sewer overflows to the Potomac and Anacostia Rivers and Rock Creek  Relieve flooding in the northeast area  Projected reduction of 96% of combined sewer overflows

3 ABlue Plains Tunnel BTingey Street Diversions CCSO 019 Overflow and Diversion Structures DJBAB Overflow and Potomac Outfall Sewer Diversion E M Street Diversion Sewer (CSOs 015, 016 and 017) GCSO 007 Diversion Structure and Diversion Sewer HAnacostia River Tunnel IMain Pumping Station and Tingey Street Diversions JNortheast Boundary Tunnel YBlue Plains Dewatering Pumping Station and ECF ZPoplar Point Pumping Station Replacement Blue Plains Tunnel (Construction) Poplar Point PS (Procure) Anacostia River Tun. (Construction) Tingey St Diversions (Construction) CSO 007 (Completed) CSO 019 (Completed) M St Div. Sewer (Construction) JBAB Diversions (Procurement) J  The LTCP Consent Decree focuses on cleaning up the Anacostia River first  157-million-gallon (MG) storage/ conveyance tunnel, about 13 miles long  Segments south of RFK Stadium must be operational by 2018  Segments north of RFK Stadium are planned to be operational by 2022  Major progress has been made on advancing flood relief to Blooming- dale and LeDroit Park with First Street Tunnel To date, DC Clean Rivers Project has contracted more than $1.12 billion in construction and engineering projects Main PS Diversions (Procure) Northeast Boundary Tunnel (Design) First St Tunnel (Construction) Clean Rivers – Anacostia Projects

4 Clean Rivers Projects in Construction Diversion sewer under construction. Tunnel Dewatering Pump Station and Enhanced Clarification Facility on Blue Plains.  Blue Plains Tunnel First in a series of four tunnel segments to mitigate sewer overflows in our local waterways Contract value: $331 million Construction period: Sept 2011 – Nov 2015  Tingey Street Diversion Sewer Divert 77 mgd of combined sewer flow into the Blue Plains Tunnel Contract value: $16 million Construction period: Feb 2012 – Apr 2014

5 Clean Rivers Projects in Construction  Irving Street Green Infrastructure Install bioretention facilities in the DDOT Right-of-Way to mitigate flooding in the Bloomingdale neighborhood Contract value: $3.5 million Construction period: Dec 2013 – Mar 2014  M Street Diversion Sewers CSO 015, 016, and 017 Control overflow from CSO 015 and consolidate CSOs 016 and 017 Contract value: $31 million Construction period: Mar 2012 – Dec 2014 The Washington Navy Yard is just west of CSO 015. Bioretention system installed.

6 Clean Rivers Projects in Construction  Anacostia River Tunnel Second in a series of four tunnel segments to mitigate sewer overflows in our local waterways Contract value: $253 million Construction period: mid-2013 – Sept 2017  First Street Tunnel Third in a series of four tunnel segments Contract Value: $157.6 million Construction period: Oct 2013 – Mar 2016 First Street NW in Washington, DC.

7 Clean Rivers Projects in Procurement  Main Pumping Stations Diversion Design-Build Estimated contract value: $60 million Shortlist notification: Sept 3, 2013 Select Design-Build firm: May 2014 NTP: June 2014  Joint Base Anacostia-Bolling Overflow and Diversion Structures Overflow and diversion structures, odor control and venting facility, hydraulic shaft internals, monitoring and data collection system, system start-up Design-Build in procurement Estimated contract value: $30 – $40 million Construction period: Oct 2014 – Jan 2018 Select Design-Build firm: June 2014 NTP: October 2014 Rendering of Main Pumping Station. Overflow and diversion structure rendering. 7

8 Clean Rivers Project in Procurement  Poplar Point Pumping Station Replacement and Main Outfall Sewers Serves as junction of the Anacostia River Tunnel and the Blue Plains Tunnel; diverts flows from the main outfall sewers into the Blue Plains Tunnel Design-Bid-Build (Prequalification) 100% design completed Estimated contract value: $30 – $44 million Construction period: Dec 2014 – Dec 2016 Rendering of Poplar Point Pumping Station.

9 Clean Rivers Project in Design  Northeast Boundary Tunnel Fourth in a series of four tunnel segments to mitigate sewer overflows in our local waterways Design-Build delivery method Estimated contract value: $500 – $600 million Construction period: Aug 2016 – 2022 The Northeast Boundary Tunnel alignment is shown in green.