North Wasco County School District 21 officials are beginning to go out to the community with its concept of seeking a 235 million dollar bonding authority to replace four of their school buildings over the next 20 years and do other capital upgrades.  D-21 Board Chair Kathy Ursprung says the board has not yet made a decision on whether to put the plan on the November ballot, but they are beginning a process to gauge public opinion.  She says unlike going out for separate bond measures for each project, tax rates would remain consistent.  The first project would be to construct a new high school on the Wahtonka campus.  A town hall meeting on the bond plan is set for Tuesday evening at 6:30 at Mid-Columbia Senior Center.