Shoreline teachers expressed frustration with delays on payments that were contractually agreed upon in January in a letter delivered last week to Superintendent Bob Raines and the district’s board of trustees. The letter, signed by the Shoreline Educators’ Association and read aloud by eighth-grade teacher Julie Cassel at last Thursday’s board meeting, also called for Mr. Raines to spend at least four days a week at the district office in Tomales, claiming his absence creates…