Dudek will be studying the possibility of the Rainbow Municipal Water District obtaining some of its water supply from the Bonsall Groundwater Basin of the San Luis Rey River. The board voted 5-0 to approve a $572,903 contract with Dudek, Oct. 24, to provide engineering services for studies which would bring a Bonsall Groundwater Basin desalter project closer to implementation. “This project is to evaluate what water rights we have in the Bonsall basin and the feasibility of extracting that,” Rainbow general manager Tom Kennedy said.