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District of Columbia Water and Sewer Authority

District of Columbia Water and Sewer Authority. Fort Stanton (CSO 006) Separation Project - Status and Coordination Update - for the Environmental Quality and Operations Committee Meeting REVISED May 20, 2004. Presentation Overview. Project Description

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District of Columbia Water and Sewer Authority

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  1. District of ColumbiaWater and Sewer Authority Fort Stanton (CSO 006) Separation Project - Status and Coordination Update - for the Environmental Quality and Operations Committee Meeting REVISED May 20, 2004

  2. Presentation Overview • Project Description • Coordination / Planning • Lead Service Replacements • Separation CIP Costs • Separation CIP Schedule • Current Status

  3. CSO-006 Separation Study Area N CSO-006 Separation Study Area (Approximate) Source: NOT TO SCALE

  4. Anacostia CSO-006 Separation Separation of 13.5 acre CSO area on east side of Anacostia (CSO-006) CSO outfall converted to storm water outfall New storm sewer planned (some new sanitary sewer needed) Reduction/control of stormwater would benefit water quality LID is possible technique Engineering study complete

  5. Extent of Current Development in CSO-006 Area

  6. Typical Combined Sewer Connection in CSO 006 Area

  7. Separation Plan in CSO 006 Area (Est. Cost = $3,900/private property) New Storm Sewer Connection Roof Leader Disconnected and Rain Barrel (LID) Used* New Storm Sewer in Street Disconnects Combined Sewer Converted to Sanitary Sewer *No Extension on Private Property Required (May Result in 10-50% savings).

  8. CSO-006 - LID Option Summary

  9. Constructed Wetland Constructed Wetland N • Specifically considered for Anacostia CSO-006 separation • Treats and infiltrates stormwater • Handles smaller flows • Mix of treatment and infiltration • Larger flows go to receiving water I-295 NPS Property Anacostia River CSO converted to storm water outfall NOT TO SCALE

  10. Bioretention/Filtration

  11. Bioretention/Filtration Street High Flows Low flows Catch Basin Biofiltration Unit FilterraTM unit courtesy of Americast • Paired biofiltration unit and catch basin • Allows retention and filtration • Improves streetscape

  12. Water Quality Catch Basins • Allows settling/treatment of storm water Outlet Water Line Oil/Grease/ Floatables Solids/Grit Solids/Grit Typical Triple Water Quality Catch Basin

  13. Rain Barrels at Downspouts • Captures and holds rain for beneficial use • Water conservation as well as storm water reduction benefit

  14. Coordinated WASA Activities • Lead Service Replacements and Other Improvements to the Water System • Combined Sewer Overflow (CSO-006) Separation Project

  15. Lead Services in/around CSO 006 Area

  16. Lead Service Replacements in CSO 006 Separation Area Approximate Number of StreetLead Services MLK Avenue, SE 9 U Street, SE 21 V Street, SE 20 Total Estimated Cost* $500,000** *Total Est. Cost: 50 Services x $10,000/service = $500,000 **Est. Cost does Not include Paving or Work on Private Property

  17. Lead Service Replacements in CSO 006 Separation Area • Construction Planned to Start in Fall 2005 • Ongoing Lead Service Replacements Completed During This Time • Priority Lead Service Replacements Will Be Completed Earlier

  18. Planning with Others • Trans~forming Anacostia Partnership • Working with Multiple Groups • Anacostia / Fort Stanton Community & ANCs • DC Office of Planning • DC Dept of Health • DC Dept of Transportation • National Park Service • Anacostia Watershed Society • LID Center • Community Groups and ANC’s • Planning public meetings in Summer 2004

  19. Current CIP Budget1 Notes: 1. Current CIP Costs are for CSO 006 Separation Project Only (i.e., lead service replacement cost NOT included), and are partially funded with an EPA SAP Grant.

  20. Current Schedule Notes: 1. May vary, dependent on coordination with other groups and DC Agencies (i.e., DDOT).

  21. Alternatives Considered • Alt. 1 – Use of 8 “Filterra” biofiltration tree boxes w/ CSO Separation Plan • Alt. 2 - Use of 12 “Filterra” Biofiltration Tree Boxes and Inline Trash Netting along SW Outfall w/ CSO Separation Plan • Alt. 3 – Use of 23 “Filterra” biofiltration tree boxes and 23 DDOH-approved Water Quality Catch Basins w/ CSO Separation Plan • Alt. 4 - Use of 23 DDOH-approved Water Quality Catch Basins (WASA option if DDOT does not sign MOA for tree box O&M) w/ CSO Separation Plan

  22. Alternatives - Cost Comparison

  23. LID Grant Option • LID grants would be provided to homeowners for disconnection of roof leaders for onsite infiltration • Funding for onsite design of rain barrels, rain gardens, and porous pavers • Plumbing permit required through DCRA, and program administered by Environmental Stakeholder (e.g., AWS)

  24. Current Status • Final CSO 006 Separation Study Submitted • Recommended Alternative 3 - Use of 23 “Filterra” biofiltration tree boxes and 23 DDOH-approved Water Quality Catch Basins w/ CSO Separation Plan (Alt. 3 Layout – Last Slide) • Grant Concept Approved for Implementation of LID Controls by Environmental Stakeholder Group • Meetings Scheduled with Stakeholders and Coordinating with Public / ANCs

  25. CSO-006 Separation Study – Alternative 3

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