The North Wasco County School District 21 board approved adjustments to the school calendar to help provide more time in a second trimester that has been disrupted by inclement weather.  The board approved changing February 6 from an in-service day to a student contact day, pushing back the end of the trimester to March 17, and pushing back a teacher work day to March 20.  D-21 has had eight full day cancellations and seven delayed starts this winter.  Superintendent Candy Armstrong says they are still within minimum state requirements for classroom time at the middle and high school, but slightly under that mark at the elementary level.  In other business, the board received a report from District maintenance director Don Carter that the snow loads on D-21 buildings are well within tolerance levels.  Armstrong noted they are dealing with leaky roofs, but there are no structural issues.