GONZALES — Several environmental groups who are opposed to the RiverPlex MegaPark Industrial Development in Ascension made their case today as they claimed deals to attract companies like Hyundai are shrouded in secrecy.The RiverPlex is planned to house Hyundai, Exxon and CF Industries.According to the groups, which included Rural Roots Louisiana and the Louisiana Bucket Brigade, who collaborated to protect West Ascension Parish from industriali…