It's been quit a long time sense I was last in the Navy Yard station. However last time I was there I observed that the east entrance passageway has a knock out provision for a surface entrance on the south side of M Street.
WMATA's Planning and Development Committee issued a report with drawings as to what modification needed to be done to the west entrance to accommodate the new baseball park and other development adjacent to the station on 10 19 2006.
Planning and Development Committee: Navy Yard East Entrance 467k PDF (Note: The location of the surface elevator shaft on pages 8 does not stack in the same location as shown on pages 7.)
Summery; The existing facility is designed to handle roughly 5000 people per hour. The WMATA staff recommended to the Planning and Development Committee, relocating the kiosk, fare gates and vendors to the surface, (Rosslyn, Anacostia) increasing the number of fare gates and vending machines and adding a stair between the mezzanine and platform, installing elevators between surface and mezzanine and between mezzanine and platform. These capacity upgrades to the facility will allow the west entrance to handle roughly 15,000 people per hour. On game day the west station entrance will be configured for one way operation before and after games. The east will remain in two way operation on game day.
The modifications were approved by the Real Estate Committee of Board of Directors 09 21 2006
Agenda Real Estate Committee 29.3k PDF
Estimated cost of construction roughly $20,000,000.00
John in the sand box of Maryland's eastern shore.