In conducting the transportation analysis an additional set of assumptions 

 were made regarding background development and traffic conditions. These Include: 



o The Central Artery North Area Project (i-93/Route 1 interchange) will 

 be completed as planned by the 1994 design year, and the City Square 

 Intersection will be Improved as per the proposal of the Boston 

 Transportation Department. 



o The balance of development In the Navy Yard will be completed In 

 accordance with the plan proposed by the Boston Redevelopment Authority 

 (BRA), dated May 10, 1988. 



o The Navy Yard will contain a total of 3,600 to 4,300 parking spaces 

 after full development, not Including any parking built expressly for 

 the Aquar ium. 



o The Gate 5 exit from the Yard to Chelsea Street will be widened to two 

 outbound lanes. 



o Access through Gate 1 will be provided to allow buses to reach the 

 Aquarium and avoid the difficult right turn from Chelsea Street to the 

 Gate 4 entrance. 



o Forty-five percent (45%) of the Navy Yard employees will use public 

 transportation to travel to and from work In the 1994 design year. 



o Other traffic generating activities In the area, such as the USS 

 Const I tut ion , will grow In line with the forecasts developed by the 

 Central Transportation Planning Staff (CTPS), used in the planning work 

 for the Central Artery North Area Project. 



o Tudor Wharf will be redeveloped as per the proposal described in 

 the Draft Environmental Report of October, 1988. 



In reviewing the results of the transportation analysis. It Is important 

 to keep In mind that a range of reasonable assumptions can be made, and that the 

 results can vary greatly as different assumptions are used. In this analysis, 

 reasonable upper and lower limits were tested for key assumptions, such as the 

 percentage of visitors using public transportation to reach the Navy Yard Aquarium 

 site. Other assumptions such as the development level of other uses in the Navy 

 Yard and the level of transit utilization by Navy Yard employees can be influenced 

 by policy and were not varied. However, If the BRA's development plan were to 

 change this could alter the conclusions of the analysis. 



The assumption that 45X of Navy Yard employees will use public 

 transportation Is supported by current experience. Transit use by employees of the 

 three major tenants currently In the Yard (Massachusetts Water Resources Authority, 

 Boston Redevelopment Authority and Massachusetts General Hospital) currently 

 exceeds 50%. This success Is a result of strong ridesharing and shuttle bus 

 programs which will be continued and supplemented In the future with additional 

 MBTA service to the Yard. In addition, the BRA is committed, as a matter of 

 policy, to achieving a 45% transit mode split by Navy Yard employees. 



