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The District Department of Transportation (DDOT) Office Manual for Construction Management presents DDOT's procedures and standards for managing and Transportation (DDOT) to handle various elements of their projects. DDOT's Construction Management Manual - May 2010, Section 7.2 “Change Orders,” Local/Federal Roadway & Bridge Construction Projects responsible for the quality assurance of the materials used in DDOT's construction.Wall design guidance is presented in Section 16.4 Retaining Wall Design of the DDOT Design and. Engineering Manual. This manual is available at ddot.dc. The District of Columbia Department of Transportation (DDOT) Office Manual for Construction. Management (CM) presents DDOT's procedures and standards for amendments, will apply to all proposed construction in public space. This Manual also augments the latest edition of the DDOT Standard Specifications for. The DDOT Compendium lists policies and procedures for managing the District's transportation network and public space. Construction Management Manual. Tree Preservation Policies for DGS Projects Before performing any excavation or construction activity, it is important to consider any potential impacts to