Riverside County supervisors Tuesday approved a $4.12 million contract with an Encinitas-based firm to provide engineering and design services for a project to revitalize a portion of the dying Salton Sea.

“We’ve been working on this project for several years now,” Salton Sea Authority Executive Director Patrick O’Dowd told the Board of Supervisors. “It’s a big day for the community of North Shore and a big day for Riverside County.”