2008-213 (5) - Laserfiche WebLink

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E. Removal of Muck, Rock and Other Unsuitable Material All muck, rock , clay, marl, gravel, boulders, heterogeneous fill material and any other organic or unsuitable "materials of excavation" encountered under pavement areas, structures and utilities shall be excavated and removed. Also any "unforeseen obstacles" such as buried trees or timbers, abandoned utilities, metal objects, concrete masses, or any other type of debris encountered shall be removed. All areas under proposed pavements or structures, which are indicated by testing to have more than trace amounts of silt and/or clay within the top several feet of existing grade shall be "proof rolled" using a vibratory compactor. Should the existing material continuously yield or "pump" during the proof rolling, the Engineer shall be notified and a determination made as to the amount of stripping needed to accomplish a stabilized foundation. Stripping shall be accomplished to clean in-place sand or other suitable material as approved by the Engineer. Removal of unsuitable material within areas which are to receive footings, slabs or other foundations shall be completed for the full area under such structures and to ten feet minimum outside the maximum perimeter. Where pavement is to be placed, said removal shall include all area under the surface and extend to the outside of any shoulders, under any sidewalks and bike paths, or as directed by the Engineer. All roots, stumps, logs, limbs, timbers, boulders, or any material which is not suitable for backfill material shall be removed from the site promptly and excavated and disposed of by the Contractor at his expense. Removal of all "materials of excavation" and "unforeseen obstacles" will be paid for under the heading of "Excavation and Hauling". 3.02 PROTECTION A. In Sheeting and Bracing Where excavations may endanger workmen, existing structures, utilities or other facilities, it shall be the Contractor's responsibility to immediately install and maintain adequate sheeting and bracing per OSHA specifications in order to protect said facility. No work shall proceed in such excavations until the sheeting and bracing has been properly and completely installed. The sheeting thus installed shall be removed as the work progresses or, at the discretion of the Engineer, be cut off below finished grade and left in place. Sheeting and bracing may be either steel or wood at the option of the Contractor. Sheeting and bracing shall be installed in a manner that will allow for removal without injuring or endangering workmen, the work, adjacent structures, and the like. Voids caused by withdrawal of sheeting shall be promptly and completely filled with sand and compacted to a degree equal to the surrounding soil. Drainage and Dewatering Provide for the collection and disposal of surface and subsurface water encountered during construction. 02302 — Excavation and Fill 02302 - 4