Under a preliminary nine-year plan proposed by Snoqualmie Valley School District administrators, a bond to buy more modular classrooms and convert Snoqualmie Middle School to a facility that would ease overcrowding at Mount Si High School could hit ballots early next year.

A bond to construct a second comprehensive high school would appear during the 2011-12 school year.

The school board discussed the evolving plan at a work session before its regular meeting Thursday, Sept. 25.