Olympia – Washington state drivers will soon have a chance to add a Mount St. Helens license plate to their vehicles. But before the new plate is available to the public, the non-profit Mount St. Helens Institute is auctioning the rights to the first 25 plates. The institute announced the new license plate on Wednesday. Proceeds from the auction and sales of the new plates will support the organization’s work in education, stewardship and scienc…