Prior to any excavation, the contractor shall
locate all water services, gas services, gas mains and water mains
within 15 feet of the proposed work area. The location of utilities
mentioned herein shall be performed prior to the commencement of any
excavation.
All trench excavation shall be maintained in
good condition during construction so as not to hinder or injure any
existing pipe lines or other structures adjacent to the proposed trench.
All necessary precautions shall be taken to prevent movement of the
sides of such excavations. The side slopes shall be such that the
material will not cave or slide into the bottom, and any material
sliding down at any time before the completion of the work shall be
removed by the contractor.
In case it is necessary to excavate below the
subgrade to secure a good foundation, it shall be done as directed.
In case the excavation has been carried below the grade approved,
the bottom of the trench shall be filled to the required grade with
a material satisfactory to the Engineer.
All excavated and other materials shall be so
placed as not to endanger the work and so that free access may be
had at any time to all parts of the trench and to all hydrants and
gates on pipes in the vicinity and shall be kept neatly piled so as
to inconvenience as little as possible public travel. Where required,
fences and other structures in the vicinity of the work shall be protected
and, if injured, shall be repaired or replaced. All trees in the vicinity
of the work shall be protected in a satisfactory manner.
The contractor shall pump out or otherwise remove
and dispose of as fast as it may collect any water, sewage or any
other liquids which may be found at the site of the work or may accumulate
in the excavation, regardless of whether it be water or liquid waste
from its own or adjacent areas. Dewatering methods and equipment shall
be subject to the approval of the Engineer, and all water removed
from the work shall be disposed of in an approved manner without damaging
adjacent property or other work. The contractor shall plug the upstream
end of the sanitary sewer pipe to prevent entrance of water, silt
and mud. The contractor shall, upon completion of laying and jointing
pipe, flush out the sewer pipe prior to final inspection.