Whether to restore E branch service to Arborway became controversial; much of Jamaica Plain wanted the line to return, while the MBTA did not wish to resume using the long street-running section. A 1987 study found that restoring service to Arborway would cost $37.4 million in construction and $5.9 million in annual operating costs, but would draw more riders than bus service. To settle a lawsuit with the Conservation Law Foundation, the Massachusetts Executive Office of Transportation and Construction (EOTC) agreed to environmental mitigation for increased automobile emissions due to the Central Artery/Tunnel Project. In 2000, an Administrative Consent Order (ACO) affirmed specific project commitments, including restoration of streetcar service beyond Heath Street to Arborway. Restoration was also included in the State Implementation Plan for the Clean Air Act (SIP) which is required by the Environmental Protection Agency due to non-attainment of National Ambient Air Quality Standards. After some MBTA and community opposition, a revised settlement resulted in the substitution of other projects with similar regional air quality benefits, though no longer localized along the E branch corridor. EOTC promised to consider other transit enhancements in the Arborway corridor.