BOW, New Hampshire, Dec. 13 -- The Sierra Club issued the following news release: Merrimack Station, New England's largest remaining coal plant, canceled its second smokestack retest of the year on Thursday, November 30. The retest was scheduled following allegations by the New Hampshire Department of Environmental Services (DES) that the plant's particulate matter emissions exceeded EPA limits by 70% during a February test. The plant's owner, Granite Shore Power, aborted the first scheduled re  more