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120-1.2.3 Earthwork Category 3: Includes the earthwork and related <br />operations associated with the construction of new mainline pavement, along with concrete <br />box culverts, retaining walls, and other drainage structures on the mainline pavement. <br />120-2 Classes of Excavation. <br />120-2.1 Excavation of Unsuitable Material: Excavation of unsuitable material <br />consists of the removal of muck, clay, rock or any other material that is unsuitable in its <br />original position and that is excavated below the finished grading template. For stabilized <br />bases and sand bituminous road mixes, the finished grading template is the top of the <br />finished base, shoulders and slopes. For all other bases and rigid pavement, the finished <br />grading template is the finished shoulder and slope lines and bottom of completed base or <br />rigid pavement. <br />120-2.2 Lateral Ditch Excavation: Lateral Ditch Excavation consists of all <br />excavation of inlet and outlet ditches to structures and roadway, changes in channels of <br />streams, and ditches parallel to the roadway right-of-way. Dress lateral ditches to the grade <br />and cross-section shown in the plans. <br />120-2.3 Channel Excavation: Channel Excavation consists of the excavation <br />and satisfactory disposal of all materials from the limits of the channel as shown in the plans. <br />120-2.4 Excavation for Structures and Pipe: Excavation for Structures <br />consists of the excavation for bridge foundations, box culverts, pipe culverts, storm sewers <br />and all other pipe lines, retaining walls, headwalls for pipe culverts and drains, catch basins, <br />drop inlets, manholes, and similar structures. <br />120-3 Excavation Requirements. <br />120-3.1 Excavation and Replacement of Unsuitable Materials: Where rock, <br />muck, clay, or other material within the limits of the roadway is unsuitable in its original <br />position, excavate such material to the cross-sections shown in the plans or indicated by the <br />Engineer, and backfill with suitable material. Shape backfill materials to the required cross- <br />sections. Where the removal of plastic soils below the finished earthwork grade is required, <br />meet a construction tolerance of ± 0.2 foot in depth and ± 6 inches (each side) in width. <br />120-3.2 Lateral Ditch Excavation: Excavate inlet and outlet ditches to <br />structures and roadway, changes in channels of streams and ditches parallel to the roadway. <br />Dress lateral ditches to the grade and cross-section shown in the plans. <br />120-3.3 Channel Excavation: Excavate and dispose of all materials from the <br />limits of the channel as shown in the plans. Excavate for bridge foundations, box culverts, <br />pipe culverts, storm sewers and all other pipe lines, retaining walls, headwalls for pipe culverts <br />and drains, catch basins, drop inlets, manholes, and similar structures. <br />120-3.4 Excavation for Structures and Pipe. <br />120-3.4.1 Requirements for all Excavation: Excavate foundation pits to permit <br />the placing of the full widths and lengths of footings shown in the plans, with full horizontal <br />beds. Do not round or undercut corners or edges of footings. Perform all excavation to <br />foundation materials, satisfactory to the Engineer, regardless of the elevation shown on the <br />plans. Perform all excavation in stream beds to a depth at least 4 feet below the permanent <br />bed of the stream, unless a firm footing can be established on solid rock before such depth is <br />reached, and excavate to such additional depth as may be necessary to eliminate any danger <br />of undermining. Wherever rock bottom is secured, excavate in such manner as to allow the <br />solid rock to be exposed and prepared in horizontal beds for receiving the masonry. Remove <br />01025-21 Technical Specifications <br />F:\Public Works\ENGINEERING DIVISION PROJECTS\1024-17thStreet and IR Blvd Intersection\Admim\Contract Documents\Technical <br />Specifications.doc <br />