tangent
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The difficulty with a Harvard-owned site, i.e., Beacon Yards AND the land-banked land between Beacon Yards and Western Ave is that 1.) MassDOT first has to reconfigure the turnpike alignment; 2.) then you build a deck; and 3.) then you build structures on top of the deck. Almost impossible to accomplish by 2024 without paying a very steep premium for an expedited construction schedule.
It seems to have taken Harvard longer to demolish the original Charlesview than it did for the city to build it. The schedule says they will finally finish this week. Part of the protracted time was due to recycling; part due to environmental contamination, e.g., asbestos. One can only imagine the contamination at Beacon Yards, and the adjacent chemical plant.
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Speaking of contamination, the first illuminating gas plants were built next to South Bay. Several maps suggest that these plants were located where the platforms for South Station currently are, but as the plants continued to operate until the end of the 19th Century, that precise location is doubtful.
http://www.hatheway.net/state_site_pages/ma__main.htm
You do not want to discover that the land on which you propose to build was once the site of an illuminating gas plant. I am familiar with a small site in DC where test borings for a bridge reconstruction discovered contamination in the streambed from an illuminating gas plant that had ceased operating at least 70 years prior. The remediation cost was about $1,000 a square foot.
The turnpike realignment is supposed to be completed by 2020... I don't actually think that will happen by 2020 anymore than I think they could relocate businesses, build a Billion dollar platform and construct a stadium in just 5 or 6 years at Widett.
But if they did finish the Mass Pike realignment by around 2022 then the Beacon Yards site is plenty big to construct a stadium without decking over anything.