1. 1 Piney Branch Drainage Area Piney Branch Tunnel Rock Creek 049 Piney Branch Stream Rock Creek Current Plan Proposed Plan 049 CSO Outfall 16 th St Irving St Piney Branch Stream Piney Branch CSO Controls Current and Proposed Plan for Rock Creek N Piney Branch Drainage Area N $60 M of Green Infrastructure in Piney Branch

2. 2 029 028 027 026 025 024 022 020 Potomac Tunnel I-66 021 Key Br. Lincoln Memorial Kennedy Center 029 028 027 026 025 024 022 021 020 Potomac Tunnel I-66 Key Br. Lincoln Memorial Kennedy Center Add 75 mgd to wet weather treatment system at Blue Plains Current Plan Proposed Plan Current and Proposed Plan for Potomac River NN $30 M of Green Infrastructure for CSO 027, 028, 029 $10 M to separate CSO 025, 026

3. 3 Clean Rivers Project in Planning Stage  Piney Branch Early Action Green Infrastructure Project Install Green infrastructure practices to mitigate CSO overflow to Rock Creek Design-Build delivery method Draft RFQ to be developed July 2014 Estimated contract value: $3 million Issue RFP end of 2014 Construction period: June 2015 – 2016

4. 4 DC Water’s Green Infrastructure Challenge  Seven design award winners selected  Award winners announced January 2014  RFQ/RFP for final design/construction will be issued in Third Quarter of 2014 for construction  Construction of award winning projects will start in 2015 For more information, download the Green Infrastructure Challenge Briefing Document: www.dcwater.com/greenchallenge

5. 5 Green Infrastructure: Potomac (Cumulative) Rock Creek (Cumulative) Spend $10 M by 2019Spend $3 M by 2016 Spend $20 M by 2023Spend $15 M by 2019 Spend $30 M by 2028Spend $30 M by 2024 Spend $40 M by 2032Spend $45 M by 2027 Spend $60 M by 2032 Total: $40 millionTotal: $60 million Gray Infrastructure:  Place hybrid Potomac Tunnel in operation by 2030 Proposed Consent Decree Amendments and Schedule for Green Infrastructure

6. 6 Important Dates DesignConstruction RFPNTPCompletion Design- Build Nov 2015 20162022  23-foot diameter tunnel, 70 to 180 feet deep, 28,600 feet long  5 shafts and 5 diversion structures  Estimated construction value: $500 – $600 million  Delivery method: Design-Build on an accelerated schedule NE Boundary Tunnel Alignment

7. 7 Construction Staging Areas Typical Diversion Facility

8. 8 Construction Staging Areas Mount Olivet Road (.73-acre staging area)

9. 9  Clean Rivers Program: Northeast Boundary Tunnel – late 2015 procurement for Design-Build and construction management Green Infrastructure – start work mid-2015 Upcoming Design, Design-Build, and Construction Management