Chemistry Organic chemistry: The plant manager position directs and manages all plant production operations with overall responsibilities for inventory management, production scheduling, production, maintenance, quality, safety and other production-related activities. They make about $110,000, plus benefits. The location of this career opportunity is in Fresno, California. The opening is for: ORO AGRI INC a Division of OMNIA. Inorganic chemistry: The plant manager position directs and manages all plant production operations with overall responsibilities for inventory management, production scheduling, production, maintenance, quality, safety and other production-related activities. They make about $110,000, plus benefits.