All that area east of a line commencing at the intersection of the Schenectady-Albany county line and Parkers Corners Road (Old State Road); thence westerly along Parkers Corners Road to Route 406; thence westerly along Route 406 to Pangburn Road; thence northerly along Pangburn Road to the Delaware and Hudson Railroad; thence northeasterly along the Delaware and Hudson Railroad to the Governor Thomas E. Dewey Thruway (Interstate Route 90); thence northerly and northwesterly along the Thruway to the Schenectady-Montgomery county line; except that area delineated as Level III.