Northeast Boundary Tunnel

Table of Contents 1 Purpose ...... 2 2 Project Contact ...... 2 3 Project Background ...... 2 4 Project Summary ...... 3 4.1 W Street Site ...... 4 4.1.1 Design Concept...... 4 4.2 R Street Diversion and Ventilation Control Facility ...... 5 4.3 Mount Olivet Road Diversion and Ventilation Control Facility ...... 6 5 Submission for Conceptual Review ...... 6

Appendices

Appendix A – DCCR Project Map Appendix B – NEBT Alignment and Construction Sites Appendix C – W Street Site Existing Photographs Appendix D – W Street Civil Site and Grading Plan Appendix E – W Street Site Design Drawings Appendix F – W Street Site Renderings Appendix G – W Street Retaining Wall Appearance and Fence Material Appendix H – R Street Site Existing Photographs Appendix I – R Street Civil Site and Grading Plan, Planting Plan Appendix J – R Street Site Renderings Appendix K – Mount Olivet Road Site Existing Photographs Appendix L – Mount Olivet Road Civil Site and Grading Plan Appendix M – Mount Olivet Road Site Renderings

Project Booklet 1 October 2014

Northeast Boundary Tunnel

1 Purpose DC Water is proposing to construct the Northeast Boundary Tunnel (NEBT) as a major component of the DC Clean Rivers (DCCR) Project to meet court-ordered combined sewer overflow (CSO) control objectives and provide flood relief in the Northeast Boundary area of the District. The tunnel is designed to comply with the requirements of a Federal Consent Decree entered into by DC Water, the District of Columbia (the District), and the United States, as represented by the U.S. Environmental Protection Agency (EPA) and the Department of Justice. In addition, the NEBT is also a major project associated with the Mayor’s Task Force in response to extreme flood events in Bloomingdale and LeDroit Park.

DC Water has prepared this Project Booklet for the Northeast Boundary Tunnel for review and consideration by the National Capital Planning Commission.

Appendix A illustrates the Anacostia River portion of the DCCR Project.

2 Project Contact The following is the project contact information for the NEBT Project:  Bill Levy Program Manager, Tunnel Design District of Columbia Water and Sewer Authority 5000 Overlook Avenue, SW Washington, DC 20032 Phone: 202-787-4156 E-mail: [email protected]

3 Project Background The proposed NEBT is a large, deep, sewer tunnel that will increase the capacity of the existing sewer system in the District to current design standards; significantly mitigating the frequency, magnitude and duration of sewer flooding and basement backups. Additionally, the NEBT will provide storage volume to effectively reduce CSO discharges to the Anacostia River by 98 percent. The NEBT will commence just south of Robert F. Kennedy (RFK) Stadium and terminate just west of the intersection of NW and 6th Street NW (illustrated in Appendix B). The tunnel will course in a northern direction along the west bank of the Anacostia River, beneath Langston Golf Course and then shift to the west along the southern limits of the U.S. National Arboretum and the Mt. Olivet Cemetery beneath Mt. Olivet Road NE. The tunnel will continue in a west/northwest direction beneath West NE and New York Avenue NE. The tunnel will course beneath the Amtrak rail yard and continue to the northwest beneath 13th Street NE and Bryant Street NE. To the east of the Rhode Island Avenue Metro Station, the tunnel will shift to the southwest beneath Rhode Island Avenue through the NW, First Street NW, and NW intersections and terminate between Marion Street NW and 6th Street NW.

Project Booklet 2 October 2014

Northeast Boundary Tunnel

Final design and construction of the tunnel and supporting infrastructure will begin in December 2016 and is scheduled to be completed in 2022. The proposed tunnel will be 23 feet in diameter, approximately 27,000 feet long, and constructed approximately 50 to 160 feet below the ground surface in geologic stratigraphy consisting of clays, sands and highly weathered bedrock. The entire length of the NEBT will be excavated and the ground supported by a tunnel boring machine (TBM) and a permanent concrete tunnel lining, respectively.

A majority of the tunnel support infrastructure is designed to relieve the existing sewers during storm events via diversion facilities. A typical diversion facility is depicted in Figure 1 and includes a diversion chamber, approach channel, drop shaft, and adit. The diversion chamber will direct flow from the existing combined sewer to the approach channel and drop shaft, which will then drop the flow approximately 100 feet to be delivered to the NEBT via a short connecting tunnel or “adit.” These facilities will be sited along the existing trunk sewers and near chronic flood areas. Ultimately, all flow captured by the system will be conveyed to the Blue Plains Advanced Wastewater Treatment Plant (Blue Plains) where it will be pumped out and treated to comply with DC Water’s NPDES Permit and the Federal Consent Decree.

Figure 1: Graphic illustration of typical diversion facility

4 Project Summary The entire tunnel and a majority of the components associated with the NEBT will be located below or flush with grade, similar to the existing sewer infrastructure. Manhole covers, grates, hatches and other access features are designed to be flush with final grade. Out of the eight (8) sites constructed as part of the project, two (2) sites will have permanent above-grade structures and one (1) site includes the restoration of a triangular park within the Shaw neighborhood. Tables 1 and 2 summarize the NEBT sites with visual impacts.

Project Booklet 3 October 2014

Northeast Boundary Tunnel

Table 1. NEBT Project Sites with Permanent Above-grade Structures Site Location Permanent Above-grade Structures W Street Junction Shaft District Department of Public Works . Ventilation Control Facility property in an area of mixed open space building between W Street NE and the Amtrak rail . Ventilation Vault structure yard/ New York Avenue NE . Exposed retaining wall Mt Olivet Road Diversions District Department of Public Works . Electrical cabinet and transformer property adjacent to the Mt Olivet on District Department of Public Cemetery along Mt Olivet Road NE Works property to support a ventilation control facility

Table 2. NEBT Project Site with Park Renovation (For Information Only) Site Location Park Renovation R Street Diversions Intersection of 6th Street NW, R . Cooper Park to be reconstructed Street NW and Rhode Island Avenue following construction of NW (Cooper Park) proposed NEBT facilities

4.1 W Street Junction Shaft The W Street Junction Shaft (W Street Site) is located in an industrial area bounded by W Street NE to the north, Brentwood Road to the West, Amtrak rail yard and New York Avenue to the south and Montana Avenue to the west. The eastern portion of the site currently serves as the District Department of Public Works (DPW) salt storage and fleet management facility, while the District Department of Transportation (DDOT) occupies the western portion of the site for their Street and Bridge Maintenance fleet. Amtrak’s Maintenance Facility and Commissary are located just south of the W Street Site.

The proposed facilities associated with the NEBT at the W Street Site include a below-grade junction shaft, below-grade ventilation channel, above-grade ventilation control facility, above-grade ventilation vault and retaining wall. In order to construct the junction shaft and ventilation control facility, the existing site, which slopes moderately from the north to the south, will be graded to suit construction. Grading the site will require a retaining wall to be constructed at the northern edge of the site in order to stabilize the sloped wooded area that buffers the DPW and DDOT facilities from the residential properties located along W Street NE.

Appendix C includes existing site photographs and Appendix D provides the civil-site and grading plan for the W Street Site.

4.1.1 Design Concept The ventilation control facility will be constructed along the northern portion of the site with a southern exposure. The location of the building is sited such that views from W Street NE are not interrupted (building tucked behind the existing hill). The building’s proposed dimensions are 124 feet long by 42 feet wide by 32 feet high and will be constructed of reinforced concrete with a steel frame. The roof will be finished with a green roof. The southern exposure facing the Amtrak facilities will be finished with engraved white precast and have three translucent roll up doors for

Project Booklet 4 October 2014

Northeast Boundary Tunnel equipment maintenance and access. The eastern face of the building will be finished with metal panels and serve as the main entrance to the facility, while the western exposure will be a wall of windows to allow light into the facility.

The ventilation vault will be constructed on the southwest portion of the site, adjacent to the existing salt dome. The structure will protrude 4-ft above grade and be constructed of reinforced concrete.

A new retaining wall will be constructed south of W Street to allow the hillside south of the wall to be leveled, creating usable area for the District Department of Public Works. The area south of the wall will be paved to create parking space as coordinated with the District Department of Public Works. In order to meet the 2013 stormwater treatment requirements enforced by the District Department of Environment, an appropriately sized new bioretention area will be included south of the access road. DC Water has coordinated with the District of Columbia Historic Preservation Office and addressed all archeological concerns.

The retaining wall will range in height between approximately 4-ft and 27-ft. The southern-face of the exposed wall will resemble a precast architectural concrete finish laid in a running bond pattern of modules. Each module will range from one (1) to two (two) feet in height and two (2) to six (6) feet in width. Joints between the panels will match the color of the finish panels and be recessed flush with the module chamfers. A 42-inch high, aluminum rail fence will be installed adjacent to the top of the retaining wall to provide fall protection. The aluminum fall protection fence will consist of a top horizontal grab rail and horizontal infill bars with vertical supports situated to conform to the slope of the terrain. A second fence will be positioned north of the fall protection fence along the top of the slope to meet the zoning requirement for screening the site from the residential district along W Street NE. The screening fence will be aluminum, 8-ft to 10-ft tall, with view blocking louvers, painted Bryant Park Green using the paint code below (in accordance with other DCCR Projects):

TNEMEC Endura-Shield Series 73 Aliphatic Acrylic Polyurethane Enamel, Custom Mixed Color No. 73-GO778

Appendix E contains the preliminary design drawings associated with the ventilation control facility, ventilation vault and retaining wall, while Appendix F contains renderings of the proposed new infrastructure. Appendix G includes retaining wall and fence details.

4.2 R Street Diversions

At the R Street Diversions (R Street Site), significant coordination has been completed between the District Department of General Services (which has real estate jurisdiction), District Department of Parks and Recreation (which has park jurisdiction), District of Columbia Historic Preservation Office, Advisory Neighborhood Commission 6E and the community regarding the restoration of the site. The site will be restored based on guidance and comments received from the aforementioned Owners and groups and is included as part of this submission for informational purposes only.

As part of the restoration, two existing traffic signal boxes will be relocated and painted Bryant Park Green, subject to approval by the Owners.

Project Booklet 5 October 2014

Northeast Boundary Tunnel

Appendix H includes existing site photographs and Appendix I provides the civil-site and grading plan plus planting plan for the R Street Site. Appendix J contains renderings of the renovated Cooper/Gordon Park at the intersection of Rhode Island Avenue, 6th Street NW and R Street NW.

4.3 Mount Olivet Road Diversions

The above-grade electrical cabinet and transformer associated with the Mt Olivet Road Diversions (Mount Olivet Road Site) are relatively small and located within the Department of Public Works West Virginia Avenue Maintenance Facility, which is zoned commercial-light manufacturing. These facilities will be located behind a chain link fence with privacy slats per existing site conditions. The cabinet and transformer will match those included in the Anacostia River Tunnel submission and be painted Bryant Park Green.

Appendix K includes existing site photographs and Appendix L provides the civil-site and grading plan for the Mount Olivet Road Site. Appendix M contains final site renderings.

5 Submission for Conceptual Review This package is being submitted for conceptual approval. The following items are included in this submission:  Letter Requesting Review  Appendix A – DCCR Project Map  Appendix B – NEBT Alignment and Construction Sites  Appendix C – W Street Site Existing Photographs  Appendix D – W Street Civil Site and Grading Plan: This drawing represents the final grading plan and structural configuration of the W Street site.  Appendix E – W Street Site Design Drawings - Ventilation Control Facility - Ventilation Control Vault - Retaining Wall  Appendix F – W Street Site Renderings  Appendix G – W Street Site Retaining Wall Appearance and Fence Material  Appendix H – R Street Site Existing Photographs  Appendix I – R Street Civil Site and Grading Plan, Planting Plan: The Site and Grading Plan drawing represents the final grading plan and configuration of the R Street site. The Planting Plan represents the park renovation.  Appendix J – R Street Site Renderings  Appendix K – Mount Olivet Road Site Existing Photographs  Appendix L –Mount Olivet Road Civil Site and Grading Plan: This drawing represents the final grading plan and configuration of the Mount Olivet Road site. Appendix M – Mount Olivet Road Site Renderings

Project Booklet 6 October 2014

APPENDIX F W Street Site Renderings

W Street Residences

Ventilation Control Facility

Bioretention Area

DPW Truck Park Area

Existing Salt Dome

Amtrak Property

Ventilation Control Vault

W Street Site Rendering 1: Ventilation Control Vault, Ventilation Control Facility and Retaining Wall Existing Salt Dome

W Street Site Rendering 2: Ventilation Control Facility and Retaining Wall W Street Site Rendering 3: Ventilation Control Facility and Retaining Wall 3. Salt Dome 4. Proposed Ventilation Control Facility

2. Metal Shed

1. Ivy City Yard Tracks

Vantage Point

Key: Limits of field of vision in Rendering 4. Field of vision of Ventilation Control Facility for Amtrak passenger.

W Street Site Vantage Point from Amtrak Line/ New York Avenue NE (Note: View from New York Avenue is Obstructed by Vegetation.) 4. Proposed Ventilation Control Facility 5. Proposed Ventilation Control Facility

3. Salt Dome 4. Salt Dome

3.2. MetalMetal Shed Shed

1. Ivy City Yard Tracks 1. Amtrak Tracks

W Street Site Rendering 4: View of W Street Ventilation Control Facility from Amtrak Line

APPENDIX G W Street Site Retaining Wall Appearance and Fence Material

Example of Retaining Wall Pattern Appearance Limestone Texture Blocks as Manufactured by Redi-Rock (Pictured), or Similar. Photo from Redi-Rock.

Example of Aluminum Rail Fence Appearance Photo Shows Fence Installed Behind a Stepped Retaining Wall, Similar to W Street Site. Aluminum Rail Fence Will be as Manufactured by Julius Blume & Co., or Similar. Example of Screening Fence Louvered Fence as Manufactured by AMETCO (Shown), or Similar.