The University of Maryland’s signature “Big M” logo also would be moved as part of rebuilding Campus Drive to allow for dedicated train lanes.
Land from 315 parcels would be condemned temporarily to provide easements during construction for equipment storage, drainage and other purposes.
The report does not include addresses of property owners whose land or buildings would be condemned or those that would hear the most noise. However, it says people in seven houses and four apartment buildings would hear “moderate” noise.
Several sites on the western end of the line — two houses on East-West Highway, two houses on Edgevale Court and a six-unit building at the Barrington Apartments on Rosemary Hills Drive — would feel vibrations above federal thresholds, the report says.
The state would develop unspecified “appropriate mitigation measures” to reduce vibrations, the report says.
Train noise also would affect the popular Georgetown Branch trail, an extension of the Capital Crescent trail. A four-foot sound wall would be built between Bethesda and Rock Creek Stream Valley Park, where the trail runs adjacent to back yards.
Even so, the study found, trains would have a “high level of visual impact” on the trail.
“Much of the existing vegetation would be removed, and most of the existing tree canopy would be eliminated,” the report says.
The federally required environmental review, which took four years, updated forecasts made by a draft study in 2008. The line was then predicted to cost $1.6 billion in 2007 dollars and to attract 68,100 riders a day by 2030. The new study estimates the construction costs at $2.15 billion in “year-of-expenditure” dollars and daily ridership at 74,160 in 2040. The ridership increase stemmed from anticipated population and job growth, officials said.
The line, which would have 21 stations, would cost $38 million annually in 2012 dollars to operate and maintain, according to the updated study. State officials have said they hope to begin construction in 2015 and open the line by 2020.
The public has 30 days to comment on the study before the state submits it to the Federal Transit Administration for approval. Copies are available at www.purplelinemd.com and at libraries in Montgomery and Prince George’s counties.
The FTA’s approval of the environmental review would allow the state to fine-tune the Purple Line’s design and begin condemning and buying private property.