(Federal Way, WA)  --  Weyerhaeuser Corporation is acquiring Plum Creek of Seattle for nearly eight-and-a-half-billion-dollars.  The companies have announced they'll combine to form the largest private owner of timberland in the U.S.  Weyerhaeuser CEO Doyle Simons will be the president and chief executive for the combined companies.  Simons told the "Seattle Times" there will be some overlap in terms of personnel, but it's too early to tell how many positions would be eliminated.