Sanitary Sewer Rehabilitation in Glover-Archbold Park

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1 Sanitary Sewer Rehabilitation in Glover-Archbold Park

2 Project Area

3 Project Purpose and Goals Repair sewer that has lived its full design life Improve structural integrity of sewers Reduce groundwater infiltration into pipes Reduce potential for sanitary sewer overflows Eliminate exposed pipe and manholes

4 Additional Goals Minimize disruption to park land during and after construction Meet regulatory requirements Prevent exfiltration (wastewater leaking out of pipes and manholes)

5 Project Purpose - Repair Existing Conditions Exposed Manhole Exposed Pipe Damage from Vegetation Hole in Manhole

6 Project Purpose - Repair Existing Conditions Exposed Manhole Exposed Pipe Damage from Erosion Exposed Pipe

7 Project Purpose - Repair Existing Conditions Multiple Fractures in Pipe Wall Holes in Pipe Spiraling Fracture in Pipe Wall Longitudinal Fracture in Pipe Wall

8 Project Purpose - Repair Existing Conditions Roots in Pipe Roots and Debris in Pipe Corrosion of Pipe Wall Corrosion of Pipe Wall showing Rebar

9 Field Work Completed or In Progress Engineering Activities CCTV Inspection (ongoing) Brainstorm creative concepts (ongoing) Development of a Conceptual Design (ongoing)

10 Field Work Completed or In Progress National Environmental Protection Act (NEPA) Compliance National Historic Preservation Act Section 106 Compliance initiated Archaeology investigation completed Wetlands delineation completed Forest Stand delineation completed Rare, Threatened, and Endangered Species identified Establish Limit of Disturbance for multiple concepts (ongoing) Site visits to evaluate constructability and impacts (ongoing) Meet with specialty contractors to reduce LOD (ongoing)

11 Location of Trees with Diameter Greater than 17.5-inches Reservoir Road to Canal Road, NW Van Ness Actual tree impact will be much less than shown

12 Alternatives under Consideration to Repair Buried Pipe Fully remove pipe from park by constructing: New sewers in streets using a combination of traditional open cut and trenchless construction technologies (micotunneling) Pump stations to reroute sewage from mainline sewer and laterals that currently flow towards parkland A combination of new sewers in streets and a limited number of pump stations NO Decisions Made Yet!

13 Alternatives under Consideration to Repair Buried Pipe Keep sewers in existing location by constructing: New sewer pipes in the same alignment as existing sewers New sewer pipes in a new alignment Trenchless lining of existing sewers using Cured in Place Pipe NO Decisions Made Yet!

14 Trenchless Lining of Existing Sewers Typical Construction Equipment Used in Environmentally Sensitive Areas

15 Trenchless Lining of Existing Sewers Specialty Pipe Cleaning Equipment Used

16 Trenchless Lining of Existing Sewers Typical Access Path Required

17 Trenchless Lining of Existing Sewers Typical By Pass Pumping Required

18 Protect Exposed Pipe and Manholes by Constructing Cross Vanes After Before

19 Additional Public Scoping Meetings Next Steps - Thurs, September 12, 7 PM, ANC3B public Lab School of Washington - Mon, September 16, 7:30 PM, ANC3CD public MPD 2D Police Station - Additional Meeting Dates in October are in being established DC Water is developing low-impact alternatives to greatly reduce impacts to trees NPS is in process of determining correct NEPA pathway (EA vs EIS) Once a draft EA or EIS is drafted, it will be made available for a 60 day Public Comment Period

20 Questions and Comments DC Water and NPS welcome your input on the project scope. No decisions have been made yet. How to Comment? 1) Submit via NPS PEPC Website 2) Project Manager, Jessica Demoise Collecting comments on project scope until October 31, 2013

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