Owner/Client:      Peninsula Corridor Joint Powers Board

The Peninsula Corridor Joint Powers Board proposed to renovate the existing Dumbarton Rail Bridge and introduce trans-bay passenger rail service between San Mateo County along the San Francisco Peninsula and Alameda County in the East Bay. The Dumbarton Rail Corridor Project is a key link in the Bay Area rail transit system. Ascent provided CEQA strategy, air quality, and GHG analysis services to the project team preparing the environmental documents. The air quality analysis determined the net change in operational emissions, accounting for increased passenger rail operations, increased bus operations, and reduced vehicle travel on area freeways. The evaluation also examined the potential for project-related emissions of toxic air contaminants to expose nearby receptors to increased levels of health risk. In addition, a transportation conformity analysis was conducted pursuant to the Clean Air Act. The conformity analysis examined whether the project would be consistent with the Transportation 2035 Plan for the San Francisco Bay Area, as adopted by the Metropolitan Transportation Commission, with particular focus on the regional levels of particulate matter (PM2.5 and PM10) and the potential for local hot spots of carbon monoxide.