Photo by Ola Wilk Photography
Urbahn Architects and contractor Gramercy Group have completed an extensive renovation of the Eastern Parkway-Brooklyn Museum subway station on the IRT Eastern Parkway Line for MTA Construction & Development (MTA C&D). This station, serving subway trains on routes 2 and 3, was identified in the MTA 2015-2019 Capital Plan as one of a group of key stations throughout the New York City subway system that would be made fully accessible in order to better serve riders. Many of the existing stations were constructed up to 100 years ago and predate the Americans with Disabilities Act (ADA).
The enhancements, which included the installation of three hydraulic elevators and the replacement of one street level stair, achieve full ADA compliance and have improved customer ingress and egress. “This is a popular station for those heading to local institutions such as the Brooklyn Museum, whose advocacy and support helped get this project done,” said Sarah Meyer, NYC Transit Chief Customer Officer. “By adding elevators and other ADA features we are not only helping improve accessibility for local residents, but making our stations inclusive for all those visiting, as well.”
According to Natale Barranco, AIA, LEED AP, Urbahn Architect’s Principal-in-Charge, “This $25.8 million public transportation project that serves visitors to the Brooklyn Museum and Brooklyn Botanic Garden was both technically challenging and satisfying. The station had to remain fully operational during construction, with the goal of a full accessibility upon completion. Urbahn worked closely with MTA C&D and with the contractor, Gramercy, to ensure that the work was adequately phased and remained on schedule. The project’s duration was 28 months.”
In addition to Natale Barranco, Urbahn’s team included Project Manager Nandini Sengupta, LEED AP; Project Architect Ijeoma D. Iheanacho; and Construction Administrator Siddharth Tailor. Joseph Castaldo, PE, Vice President of Operations, and Scott Krokoff, construction Project Manager, led the Gramercy team.
Additional design and construction team members included structural and civil engineer TY Lin International; mechanical, electrical, and telecommunication engineer GG Engineering; vertical transportation consultant AB Consulting; surveyor Matrix New World Engineering; cost estimator ELLANA, Inc.; and maintenance and protection of traffic planner SIMCO Engineering.
Vertical Accessibility and Mezzanine Renovations
The 2 and 3 local subway routes on the Eastern Parkway IRT Line run northbound-southbound beneath this section of Eastern Parkway adjacent to Prospect Park and the Brooklyn Museum. Express tracks run directly below the local tracks, but were not affected by the project. Two public access stairs, one located in the museum plaza on the south side of Eastern Parkway and the other directly opposite in the pedestrian mall median of the north service lane of Eastern Parkway, lead to the east mezzanine, approximately 15 feet below grade. The mezzanine contains the station agent booth, turnstiles, concessions, employee areas, and mechanical rooms. Two additional stairs lead from the mezzanine down to the respective northbound and southbound platforms about 11 feet below. A second mezzanine at the west end of the station contains employee areas and mechanical rooms and is not open to the public.
“Urbahn’s initial task was to evaluate the potential for improving vertical accessibility from the street to the east mezzanine and then to the platforms,” said Sengupta. “Installation of an elevator from street level to the mezzanine was a requirement, as was the installation of two additional elevators from the east mezzanine to the individual northbound and southbound platforms.” Upon evaluating the site, Urbahn determined that the museum plaza was the ideal location for the street elevator because there was open space surrounding the existing stair and there was direct access to both the museum and the botanic garden. The existing stair in that location had been installed approximately twenty years ago and was ADA compliant. However, the existing stair in the traffic median did not meet ADA requirements and required complete replacement.
To accommodate the elevators, the east mezzanine had to be modified in three separate areas. At the plaza entrance, the entire mezzanine width was extended by approximately 24 feet to incorporate both the street level elevator shaft and an elevator equipment room. The elevator leading from the mezzanine to the southbound platform was located within the existing mezzanine footprint, but structural modifications were required to form a shaft and to also create a pedestrian access area outside the station envelope at the platform level. Finally, the elevator and associated mezzanine and platform access areas for the northbound platform fell entirely outside of the existing footprint, requiring additions below the service lane at the north side of the station.
Photo by Ola Wilk Photography
The existing east mezzanine contained a station manager’s office, employee locker room and toilet, tile scrubbing machine maintenance room, an ejector plant, several storage rooms, and an unused concessions area. The employee and utility areas were redesigned to accommodate the new elevator floorplan and ADA requirements, and the concession area was converted to a dry storage room.
The project also included a new closed-circuit television (CCTV) security system, fire alarm system, refurbishment of the station agent booth for ADA compliance, and a local area network to support the rollout of MTA’s new fare payment system. The equipment room for the CCTV and other communications systems is located at the west employee mezzanine.
The elevators are hydraulic units, manufactured by Mid-American Elevator Co. All three cabs are four feet, six inches wide by six feet, eight inches long and have stainless steel finishes and tempered glass door panels. A 15-foot high glass and steel tower with a cantilevered canopy, enhanced by LED lighting and station signage, encloses the street level entrance. This glass box, highly visible both during the day and at night, adds visual interest to the project and enables the addition to blend seamlessly with the surrounding plaza.
The existing street level plaza stair adjacent to the new elevator was not modified. The plaza slopes down from the street toward the museum entrance at a lower elevation. To achieve ADA compliance, the crews replaced existing steps at the plaza with a ramp, which connected the grade level at the elevator entrance to that of the lower walkway. At the mezzanine level in this location, the elevator machine room (EMR) wraps around the elevator shaft. The EMR contains three oil coolers for the hydraulic machines, which generate a substantial heat load that requires exhaust. The Urbahn team designed a 25-foot long plenum exhaust that extends along the length of the ramp and forms a low wall containing exhaust grilles on one side and supporting the ramp handrail on the other. The EMR exhaust plenum’s low wall was clad in granite supplied by Miller Druck Specialty Contracting and the team sourced granite to match the existing granite on the top of the stair wall at the plaza.
The street level stair at the pedestrian mall has been replaced and its width increased from six feet to seven feet, six inches to meet additional passenger capacity as determined by MTA C&D. Excavation work for this new stair, as well as for the installation of the new northbound platform elevator, required the excavation of over 60 feet of the pedestrian mall and north service road to the depth of 36 feet. The mall surface consists of granite curbs and octagonal asphalt pavers and is interspersed with trees. Gramercy sourced granite material and the pavers to match existing materials and integrate the new surfaces within the construction zone with the existing landscape fabric. New York City Department of Parks & Recreation will plant replacement trees.
“The project included a unique art restoration component,” shared Sengupta. “During a 2003 MTA renovation of the station, a total of 60 terra cotta and stone pieces from the museum’s collection of façade decorations salvaged from New York City buildings were installed on the station walls, surrounded by glass mosaic borders. Five of these pieces were located adjacent to the plaza stair and had to be removed to permit construction of the mezzanine extension. Urbahn coordinated with MTA C&D and developed a specification for the removal, protection, and reinstallation of the artwork in a new location. Gramercy carefully removed the affected pieces and stored them in custom-made plywood crates during construction.” Additional areas of the mezzanine walls were also barricaded to protect pieces that remained in place. A custom tile shop matched and replicated the mosaic borders to enable the reinstalled pieces to blend with the original installations.
The completed project has resulted in a fully accessible station. The new elevators and stair provide an unobstructed path from the street level to the train platforms. The 24-hour agent booth has been modified to include an ADA deal tray. Additional accessible features include new tactile Braille signs, Autonomous Farecard Access System (AFAS) gates, and platform edge tactile warning strips at ADA boarding areas.
Utility and Infrastructure Work
Lighting fixtures throughout the renovated mezzanine areas and the new platform level elevator access areas were replaced with new ceiling mounted linear tube LED fixtures by Apogee Translite. New LED lighting strips by Minestone illuminate the undersides of the handrails at the new pedestrian mall stair.
In the elevator equipment room, air temperature is maintained by 4500-cfm exhaust and recirculation fans that vent to the new exhaust plenum. Additional exhaust fans were installed throughout the east mezzanine employee service areas. At the west mezzanine communications room, a new split-type cooling unit was installed to address increased heat load created by the expanded CCTV, fire alarm, and communications systems.
“Three individual areas of street level excavation were required for the elevator installations, and some existing utilities were affected,” explained Joseph Castaldo, PE, Gramnercy’s Vice President of Operations. “Most significantly, a 21-inch water main crossed over the new southbound platform elevator excavation. Construction crews installed a beam across the excavation pit to support the line, and heat traced and insulated the pipe so that it would not freeze while it was exposed during the winter months,” he added. A combined sewer line in the same area was rerouted around the pit. Other required utility relocations included a lamppost, two traffic signal posts and conduit, and a fire hydrant.
Construction and Schedule Challenges
The project presented several phasing and logistical challenges. According to Castaldo, “The team had to be creative with logistics and materials staging to perform the work within tight space and schedule confines.” Three separate excavation areas were required. The pit for the plaza elevator was located adjacent to the existing subway entrance and impacted access to a museum parking lot entrance. The two pits for the platform elevators were both located within or adjacent to Eastern Parkway traffic lanes and extended to a depth of over 36 feet below grade. All three locations had very limited space in which to work, and all operations had to be scheduled so that traffic impacts were minimized. During excavation, the crews encountered a number of car-sized boulders that had to be split and removed in sections, slowing down the process.
Once the bottom of the excavation pits was reached, the team discovered that the bearing capacity of the soil was not adequate to support the mezzanine extension footings. In order to address this issue, the team installed twelve piles, each between fifty and sixty feet deep and extending to a bottom depth of about eighty feet below grade. Steel pipe casings were installed on the upper fifteen feet of the piles, the remaining depth as well as the casing interiors were grouted, and pile caps were installed on top. Because the limited access within the excavation pits could not accommodate a standard drill rig, an excavator with a drill attachment was instead used for the installation of the piles.
Several existing mezzanine and platform level columns were located immediately adjacent to the excavation areas and had to be underpinned. This work proved to be time consuming and exacting. Laborers inside the station built underpinning pits with timber lagging and sheeting, and manually dug under each column as the pits had to be completed before the crews could excavate the areas adjacent to the columns. As each section was exposed, the pits were filled with concrete to underpin the columns.
In Spring 2020, as the street elevator structure was under construction, the COVID outbreak forced a temporary closure of the factory manufacturing the metal roofing for the expanded mezzanine level resulting in a five-week schedule delay.
Phasing was a critical consideration as the station had to maintain operation and car traffic flow on Eastern Parkway could not be disrupted. Work was carefully planned to ensure that passengers had continuous access to the gate and platform areas, employees had access to the service areas, and vehicular traffic on the street level was maintained. The work was divided into three main phases: northbound elevator, machine room and street elevator, and southbound elevator. The most critical phase was the southbound elevator excavation, as it required significant work in the middle of Eastern Parkway that impacted traffic and pedestrian flow. Gramercy developed Maintenance and Protection of Traffic (MPT) plan, meeting the NYC Department of Transportation’s standards. The MPT plan permitted the closure of one of the traffic lanes for six weeks. The lane reopened to traffic once the decking system was installed. Once the structural work was completed and the roof deck over the new mezzanine area was poured, the temporary road deck was removed and the area backfilled and repaved.
Gramercy coordinated extensively with both the Brooklyn Museum and the Brooklyn Botanic Garden to ensure that public access to major planned events was maintained throughout the project duration. The Eastern Parkway entrance to the museum parking lot had to be closed during much of construction, and Gramercy provided signage to redirect traffic. They worked with the Botanic Garden to temporarily reopen the parking lot entrance for the popular Cherry Blossom Festival weekend. In addition, the crews relocated barriers and constructed temporary stages for the 2019 West Indian Day Parade and for the Brooklyn Half Marathon.
Urbahn Architects is a full-service planning and design firm based in New York City. Since its founding in 1945, Urbahn has designed projects for organizations and institutions that operate in the transportation, residential, healthcare, education, justice, science, hospitality, multi-family residential, and infrastructure sectors. The firm served as the architect for some of the nation’s most iconic structures, including the Vehicle Assembly Building and Launch Control at Kennedy Space Center in Cape Canaveral, FL, and the Fermi National Accelerator Lab in Batavia, IL. Urbahn’s annual domestic and international project workload exceeds $500 million in construction value.
Four principals lead the firm: Donald E. Henry, Jr., AIA, LEED AP; Natale V. Barranco, AIA, LEED AP; Rafael Stein, AIA; and Ranabir Sengupta, AIA, LEED AP.
The firm’s transportation project portfolio includes the New York City Transit subway station flood mitigation resiliency program; renovations of multiple MTA subway stations in New York City; numerous projects for the Long Island Rail Road and New Jersey Transit; Newark City Subway Improvements in Newark, NJ; and rehabilitation of six train stations on the IRT White Plains Road line in the Bronx, NY.
Urbahn’s other educational, commercial, and institutional work includes the $70 million Tides North residential development in Arverne, NY; New York City Hall Mayoral Offices and Emergency Situation Center and Public Health Lab Redevelopment Master Plans in New York, NY; Centro Medico Correccional in Bayamon, PR; and Jersey City Municipal Services Complex, Jersey City, NJ; the SUNY New Paltz Engineering Innovation Hub in New Paltz, NY; Lehman College School of Nursing in the Bronx, NY; Usha Martin University Master Plan in Ranchi, India; Columbia University Baker Field Facilities Master Plan in New York, NY; P.S. 253Q Elementary School in Queens, NY; and P.S. 144Q addition in Forest Hills, NY.
Gramercy Group, Inc.
Gramercy Group began operations in 1989, offering turn-key solutions in environmental remediation and demolition. As the Wantagh, NY-based company grew its team and expertise, it has expanded its services to also include heavy civil and general contracting services. Today, the firm performs general and heavy contracting, demolition, and environmental remediation services to commercial, municipal, governmental, transportation, and infrastructure clients throughout the Northeast.
Gramercy is certified as a Women’s Business Enterprise (WBE) in New York City as well as in New York’s Nassau, Suffolk, and Westchester counties; and nationally certified as a WBE by the Women’s Business Enterprise National Council (WBENC.)
The firm’s recent transportation projects include the $59 million ADA upgrades at the 59th Street subway station in Brooklyn, NY; the site work, demolition, and abatement of the 1,100,000-square foot former Delta Terminal 3 and the demolition of the 250-ton AirTrain pedestrian bridge at the John F. Kennedy International Airport in Queens, NY; and the demolition and abatement phase of the Fulton Street Transit Center in Manhattan.