Division 800 — Division 800
Division 800 — Bridges and Structures
SECTION 801 - EXCAVATION AND FILL
801.01 Description. Foundation excavation shall include the removal of all material, of
whatever nature, necessary for the construction of foundations and substructures of structures in accordance with the plans or as directed by the Engineer. When shown as a pay item, it shall include the furnishing of all necessary equipment and the construction of all cribs, cofferdams, dewatering, etc. necessary for execution of the work. It shall also include the subsequent removal of cofferdams and cribs and the placement of all necessary backfill as hereinafter specified. It shall also include the disposal of excavated material that is not required for backfill or other specified usage, in a manner and in locations that will not affect the carry ing capacity of the channel or other drainage or be unsightly. Unless a greater area is necessary for constructi on, the bridge site shall be the area defined in Subsection 101.02. Clearing and grubbing shall be in accordance with the provisions of Subsection 201.04. All substructures, where practicable, shall be constructed in open excavation, and where necessary, the excavation shall be shored, bra ced, or protected by co fferdams in accordance with approved methods. When footings can be placed in the dry without the use of cribs or cofferdams, backforms may be omitted with the approval of the Engineer and the entire excavation filled with concrete to the top of the footing. The additional concrete required shall be placed at the expense of the Contractor.
801.02 Materials . Unless designated otherwise, all ma terial used for backfill shall meet
the requirements of Subsection 203.03.8.6.
801.03 Construction Requirements .
801.03.1 Preservat ion of Channel . Unless otherwise specified, no excavation shall be
made outside of cribs, cofferdams, or sheet piling, and the natural stream bed adjacent to the structure shall not be disturbed without permission of the Engineer. If any excavation or dredging is made at the site of the struct ure before cribs or cofferdams are in place, the Contractor shall, without extra compensation and after the foundation base is in place, backfill all such excavation to the original ground surface or river bed with material satisfactory to the Engineer. Material depos ited within the stream area from foundation or other excavation or from the filling of cofferdams shall be removed and the stream area freed from obstruction thereby.
801.03.2 Depth of Footings . The elevations shown on the plans for bottoms of footings
shall be considered as approximate, and the Engineer may order in writing changes in dimensions or elevations necessary for a satisfactory foundation.
801.03.3 Preparation of Foundations for Footings. All rock or other hard foundation
material shall be cut to a firm surface, either level, stepped, or roughened as may be directed by the Engineer, and then cleaned of all loose material. All seams shall be cleaned out and filled with concrete, mortar, or grout.