No materials are involved.
Ground adjacent to the excavations shall be graded to prevent
water from running in. The contractor shall remove any water accumulating
in excavations by pumping or other suitable means.
The contractor shall do all bracing, shoring and sheeting necessary
to prevent failure of the banks of the excavation and to protect the
work, workmen, public, under and aboveground utilities and structures,
pavements, and public and private property. No bracing, shoring or
sheeting shall be placed below the bottom of the pipe or structure
unless approved by the engineer. Shoring, sheeting and bracing of
any kind shall be withdrawn as the backfilling proceeds, except that
the engineer may require such bracing to be left in place if it has
been placed below the bottom of any structure or pipe, or if he deems
it necessary in order to protect adjacent structures, utilities or
property.
The contractor shall provide, install and operate an adequate
wellpoint system for dewatering when necessary to stabilize trench
bottoms and banks or other excavations or when necessary to protect
the work, workmen, public, under and above ground utilities and structures,
pavements, and public and private property. The well-point system
or portions thereof shall be removed by the contractor, upon the completion
of backfill, and the holes remaining from the points shall be backfilled
and thoroughly tamped.
After the structure has been completed, inspected and approved,
or, in the case of pipe, after each joint has been made, inspected
and approved, backfill shall proceed immediately. When the pipe has
been laid, this shall be done in six-inch layers of loose granular
material free from stones, each layer thoroughly tamped, to a height
of 24 inches above the outside top of pipe. The remainder of the trench
and the entire excavation for all structures other than pipe shall
be backfilled in twelve-inch layers, loose measure, each layer thoroughly
tamped. Dampening of the material to be tamped may be required by
the engineer.
Compaction shall conform to Article 2.7.3 of the New Jersey
State Highway Department Standard Specifications, except that puddling
will not be permitted.