Combined Sewer System Permit and Long Term Control Plan Update CSS - PowerPoint PPT Presentation

Combined Sewer System Permit and Long Term Control Plan Update CSS Stakeholder Group Meeting #1 October 12, 2017 City of Alexandria - Department of Transportation and Environmental Services Alexandria Renew Enterprises 1

PRESENTATION OUTLINE  Purpose and Goals  City – AlexRenew Partnership  Combined Sewer System (CSS)  Overview  2016 Long Term Control Plan Update  2017 State Legislation  Combined Sewer Overflow Strategies  CSS Stakeholder Group Meeting Schedule  Questions and Public Comment 2

Purpose and Goals 3

Public Participation Goals Increase stakeholder Develop basic awareness of the City’s understanding of the combined sewer Long Term Control system and the Long Term Plan Update Control Plan Update program. recommended strategies. Solicit feedback on Awareness, the combined sewer consideration and control strategy responsiveness on the recommendations. Long Term Control Plan. 4

How the Long Term Control Plan Update Might Affect the Community • Improved water quality in Hunting Creek, Oronoco Bay and the Potomac River • Potential for ancillary benefits • Noise, road closures, construction traffic, right-of-way acquisition, dust, other community impacts • The Long Term Control Plan projects will be part of the City’s and AlexRenew’s capital improvement budgeting process • Sewer rate impacts 5

Stakeholder Group Charge (Resolution No. 2781)  Provide recommendations on how a primary strategy can accomplish the City’s goals and permit requirements while minimizing impacts to the community  Review and monitor the preparation of the Long Term Control Plan  Permit and regulatory issues  Engineering and analysis of infrastructure alternatives  Implementation plan schedule and funding strategy  Serve as a central information receiving/dissemination body related to the Long Term Control Plan 6

City – AlexRenew Partnership 7

Overview of AlexRenew History of Working with the City for Clean Water 8

Overview of AlexRenew 1970s – 1980s 2011 – 2016 1999 – 2006 $100 Million $160 Million $350 Million Major Upgrades to Improve Chesapeake and Address Local Water Quality Actions 9

AlexRenew Wet Weather Timeline 1990s: National CSO Policy and First 1999: CSS Permit Approved 2010: Long Term 2016: Hunting Control Plan Long Term Creek 2017: Control Plan TMDL CSO Update CLEAN WATERWAYS Legislation 2013: 2010: Our Permit Joint Wet 2007: Requires Wet Weather Wet Weather Weather Solution Flow Model 1999: Remediation Presented Update Wet Weather Flow Reduction 1995: Strategy Initiated wet weather studies 10

AlexRenew Wet Weather Program Commonwealth Interceptor CSO Potomac Yards 003 Trunk Sewer CSO 001 CSO Hooffs Run Hooffs Run 004 Junction Chamber Tunnel Holmes Run Trunk Sewer Potomac Interceptor Potomac River Relocated CSO 004 CSO 002 AlexRenew VPDES Permitted Outfall Cameron Run Hunting Creek Jones Point 11

City’s Combined Sewer System (CSS) Overview 12

Separate Sewer System 13

Combined Sewer System 14

Location of Combined Sewer System (CSS) Communities  Combined sewer communities are concentrated in older communities in the North East and the Great Lakes regions.  Currently, 772 authorized discharges from 9,348 combined sewer outfalls in 32 states and DC  Nearby combined sewer communities include Washington, DC, Richmond, and Lynchburg. Photo/Graphics Source: www.theodorelim.gov 15

Combined Sewer System Total Area = 540 Pendleton St. CSO-001 acres (6% of City) Four permitted Combined Sewer outfalls: Service Area • CSO-001 to Oronoco Bay Duke St. • CSO-002 to CSO-003 & CSO-004 Potomac River Hunting Creek • CSO-003 to Hooffs Run • CSO-004 to Hooffs Run Hooffs Run • Outfalls permitted Alexandria Renew by the Virginia Enterprises Water Resources Department of Recovery Facility Environmental Hunting Creek Quality (VDEQ) Royal St. 16 CSO-002 16

Combined Sewer Overflow (CSO) Locations Hunting Creek: CSO-002 Hooffs Run: Oronoco Bay: CSO-001 CSO-003 & 004 17

City’s CSS Timeline 1990s: National CSO Policy and First 1999: CSS Permit Approved 2010: Long Term Hunting 2016: Control Plan Creek Long Term 2017: TMDL Control Plan CSO Update CLEAN WATERWAYS Legislation 2013: 2010: Our Permit Requires Joint Wet 2007: Wet Weather Weather Wet Weather Remediation Solution Flow Model 1999: Presented Update Wet Weather Flow Reduction 1995: Strategy Initiated wet weather studies 18

Regulatory Paradigm Shift • City’s existing Long Term Control Plan based on best practices for operation and maintenance of combined systems. • Proactive separation as part of Area Reduction Plan. • Monitoring and modeling of combined sewer overflows. • Must address the Hunting Creek Total Maximum Daily Load. • Must address the 2017 state legislation. 19

Clean Water Act Goals Total Maximum Daily Load (TMDL)  Clean Water Act goal that all waters of the United States be “fishable” and “swimmable”  State develops impaired waters list and total maximum daily loads  Hunting Creek listed as an impaired water for E. coli bacteria 20

Sources of Bacteria in Hunting Creek TMDL  Virginia Bacteria Water Quality Criteria  126 E.coli counts per 100mL  Sources of Bacteria:  Stormwater  Wildlife  Pets  Combined Sewer System  Sanitary Sewer Overflows  AlexRenew Water Resource Recovery Facility (WRRF)  Septic Systems 21

Hunting Creek Bacteria Total Maximum Daily Load  Hunting Creek Bacteria TMDL and CSOs:  Total overall bacteria reduction from CSO discharges of 86%:  99% reduction from Outfalls 003 and 004 (Hooffs Run)  80% reduction from Outfall 002 (Hunting Creek)  Applicable to Outfalls 002, 003, and 004 only  CSS Permit issued in August 2013 requires City to address TMDL through an update to its Long Term Control Plan 22

2016 CSS Long Term Control Plan Update 23

2016 Long Term Control Plan Update Framework Other Potential Opportunities Targeted Sewer Separation Complementary Strategy Green Infrastructure Complementary Strategy Store and Treat Primary Strategy 24

2016 LTCPU: Store and Treat Primary Strategy  Store and treat: build CSO storage and send to the wastewater treatment facility after CSO event for high level of treatment  Storage tanks (underground)  Deep tunnels 25 Toronto: Keelesdal-Hyde Ave DC Water: Tunnel Underground CSO Storage Tank Boring Machine 25

2016 LTCPU: Existing CSOs Existing CSOs Dropshaft CSO-003/004 Project  10-foot diameter tunnel from Duke Street to AlexRenew WRRF Alexandria National  1.6 million gallons storage Cemetery  Less than 4 overflows in a typical year  Shafts range in diameter from 20-ft to 30-ft  Shafts and tunnel range in depth from 60-ft to 100-ft Relocated CSO-004  Benefits  Substantial reduction in CSO Alexandria Renew Enterprises occurrences and volume Water Resources Recovery Facility  Reduces basement backups  Maximizes pollution reduction 26

2016 LTCPU: CSO-002 Storage Tank Alternatives CSO-002 Project: • 3 million gallons of storage • Less than 4 overflows in a typical year • All tank location alternatives under consideration 27

2016 LTCPU Complementary Strategies  Green Infrastructure  Reduce the amount of stormwater  Provide ancillary environmental and community benefits  City-led and developer-led projects  Targeted Sewer Separation  Condition of redevelopment  Began to implement in early 2000s  Focus in CSO-001 Area (North Old Town Small Area Plan) 28

2017 State Legislation 29

Recent State Legislation Signed into law April 26, 2017  Requires VDEQ by July 1, 2018 to determine what actions by the City are necessary to bring all combined sewer outfalls into compliance  Requires initiation of construction activities by July 1, 2023  Requires completion of construction by July 1, 2025  Requires City to submit to VDEQ annual report on progress of meeting state legislation 30

What does this mean for the LTCPU?  Significantly accelerates the Long Term Control Plan Update schedule for outfalls impacted by the Hunting Creek TMDL  Requires CSO-001 project based on EPA CSO Presumption Approach  Planning Process  Potential to address CSO-001 and 002 together  Additional strategies to be considered working with AlexRenew  Refinement of CSO-003/004 project  Focus will be on meeting mandated schedule  Additional community and stakeholder engagement  Revision to Long Term Control Plan Update 31

Looking Forward  Reevaluate combined sewer strategies  Reengage the community  Revise the Long Term Control Plan Update and send to VDEQ by June 1, 2018 32

Combined Sewer Overflow Strategies 33