Contour lines at one foot intervals. At grade locations and configurations of exterior elements of existing buildings and structures, bus shelters, fences and other features on the site. Information on any underground tunnels and areaways including plan dimensions, locations and elevations of slabs and columns. At grade locations of major exterior elements of the facing side of existing buildings facing the site. Descriptions, locations, sizes and invert elevations of piped utilities through perimeter building walls.
Utility locations surrounding the building Includes research of public and private utility records.
Information on vaults and manholes, including interior clear dimensions, rim and bottom elevations. Information on utility and drainage pipe or conduit types and sizes, invert elevations, depths, etc. Indicate on the drawings whether corners were found or set, with a description of each type. Horizontal control shall be as used by the City of Seattle. All locations shall be tied to that control.