MONTICELLO — Monticello Superintendent Eric Olson’s personal cell phone contains 4,251 contacts. Olson estimates about 3,700 are connected to Monticello Public Schools. They include principals, teachers, custodians, community leaders, coaches and former students who now send their own kids to Monticello schools. For a superintendent whose career has been built on relationships, the number serves as a fitting measure of a 21-year journey that is coming to an end this week.