IOWA CITY — Unitarian Universalist Society of Iowa City could be relocating the congregation to Coralville.A Tuesday letter to society members states a $600,000 purchase agreement for 5.5 acres of land at 2355 Oakdale Road in Coralville has been signed.Jim Olson, vice president of Unitarian Universalist Society of Iowa City, said members of the congregation who have visited the site have lauded its possibilities.“The sentiment has been overwhelmingly positive,” he said.