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120 - 1 . 2 . 2 Earthwork Category 2 : Includes the earthwork and related <br /> operations associated with the construction of turn lanes and other non - mainline traffic lanes , <br /> widening , roadway shoulders , concrete box culverts , retaining walls , and other drainage <br /> structures on the non - mainline pavement . <br /> 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 excavation <br /> of inlet and outlet ditches to structures and roadway , changes in channels of streams , and <br /> ditches parallel to the roadway right-of-way . Dress lateral ditches to the grade and cross- <br /> section shown in the plans . <br /> 120 -2 . 3 Channel Excavation : Channel Excavation consists of the excavation and <br /> 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 consists of <br /> the excavation for bridge foundations , box culverts , pipe culverts , storm sewers and all other <br /> pipe lines , retaining walls , headwalls for pipe culverts and drains , catch basins , drop inlets , <br /> manholes , and similar structures . <br /> 120-3 Excavation Requirements . <br /> 120 -3 . 1 Excavation and Replacement of Unsuitable Materials : Where rock , muck , <br /> clay , or other material within the limits of the roadway is unsuitable in its original position , <br /> excavate such material to the cross- sections shown in the plans or indicated by the Engineer , <br /> and backfill with suitable material . Shape backfill materials to the required cross-sections . <br /> Where the removal of plastic soils below the finished earthwork grade is required , meet a <br /> 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 structures and <br /> roadway , changes in channels of streams and ditches parallel to the roadway . Dress lateral <br /> 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 limits of <br /> the channel as shown in the plans . Excavate for bridge foundations , box culverts , pipe <br /> culverts , storm sewers and all other pipe lines , retaining walls , headwalls for pipe culverts and <br /> 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 /> 21 Technical Specifications <br /> F :\Public Works\ENGINEERING DIVISION PROJECTS\0744-8th St-US1 to 6th Ave\Admim\bid documents\0744 CONTRACT <br /> DOCUMENTS\Technical Specifications . doc <br />