DETROIT LAKES — The Becker County Board on Tuesday rejected a petition that would have required developers to complete an Environmental Assessment Worksheet on a proposed gravel mining project in Lake Eunice Township. Developers Matt Hedstrom and Nick Bowers, doing business as Prairie Lake Investments LLC, plan to mine about 350,000 cubic yards of gravel in the process of developing a 90-acre chunk of land in Lake Eunice Township. The plan is to…