An environmental review of a controversial boatyard expansion in Mattituck may soon get underway. At a meeting Monday, the Southold Town Planning Board approved the final scope, a document required as part of the State Environmental Quality Review Act that spells out what aspects of the project must be further studied before it’s approved or denied. The board voted 4-0 to accept the final scope, with chairman Donald Wilcenski recused. “This is a major project,” Planning Board vice chair James Rich said during Monday’s meeting, adding that he thought the final document, which is nearly 30 pages long, is “very complete.”