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PART 3 - EXECUTION 3.01 Foundations The standard foundation for pre -cast manholes shall be as follows: A. Undisturbed, existing in-place, natural granular soils consisting which have been finished graded by hand to final elevation. No over excavation shall be permitted. B. For manholes not placed on undisturbed, existing, in-place natural granular soils, a 12 inch layer of 3/8" to 3/4" crushed rock shall be placed on the prepared trench bottom, and compacted. A two inch layer of high early strength cement grout may be placed on top of the rock base for leveling. The manhole base shall be set on the foundation, to the proper invert elevation, while the grout is still workable, so that the grout will fill all voids beneath the manhole base. 3.02 Manholes All workmanship shall conform to best standard practice. Manholes shall be built accurately to the dimensions shown on the Plans. The top of the manholes shall be brought accurately to grade with masonry. Manholes shall be completed (with inverts, frames and covers) as the work progresses. Particular care shall be taken that no water rises on the masonry until the mortar is thoroughly set. Any masonry damaged in this manner shall be removed upon the order of the Engineer. All pipes or castings to be embedded in masonry work shall be accurately set and if so required, headers shall be laid around the casting so embedded. Spurs and stubs for branch lines shall be built in the manholes where shown on the Plans or otherwise required by the Engineer. They shall be closed with vitrified plugs. 3.03 Watertight Workmanship The entire work of constructing manholes must be carried on in a manner to insure watertight work. Any leaks in manholes shall be caulked, repaired or the entire work shall be removed and rebuilt. 3.04 Disposal of Water from Excavations All water pumped or bailed from excavations shall be conveyed in a proper manner to a suitable point of discharge by the Contractor at his own expense. The Contractor shall provide for the disposal of water removed from excavations in a manner that will not cause injury to public health, private or public property, any portion of the work completed or in progress, the surface of the streets, or cause any impediments to the reasonable use of the site by other Contractors. The Contractor shall be responsible for complying with all the local regulations of the Department of Environmental Regulation regarding pollution of the canals. The Contractor shall take special precautions to eliminate any odor problems resulting from the discharge of sulfide water, such as submerged discharge outlets and overflow basins. 02531 — Gravity Sewer Manholes 02531- 3