RIYADH: The Diriyah Gate Development Authority has signed an agreement with the Saudi Investment Recycling Co. for the handling and processing of all waste within the authority"s jurisdiction. DGDA, which is responsible for preserving Saudi’s first capital and historic place Diriyah, and its UNESCO World Heritage Site At-Turaif, will work with SIRC to develop citywide waste management methods that adhere to international best practices, according to a press release. The agreement also covers cooperation on research, investment opportunities, deployment of solutions, operations, and management in the future.