EXCAVATIONS, FILLING AND BACK FILLING
SCOPE OF WORK
The
scope for work covered under this specifications pertain to excavation of
foundations, trenches, pits and over areas, in all sorts of soil, soft and hard rock, correct to dimensions given in the drawing including shoring, protections of existing underground utilities of any, such as water lines, electric cables etc. dewatering and shoring if necessary, stacking the useful materials as
directed within the lead specified, refilling around the foundation and into the plinth with selected useful excavated earth and disposing off the surplus earth / materials within specified lead and finishing the surface to proper levels, slopes and camber etc. all complete.
SITE CLEARANCE
Before the earth work is started the
area coming under
cutting and filling
shall be cleared
of all obstruction, loose stones, shrubs, rank vegetation, grass, bushes and rubbish removed up to a distance of 150
meters outside the periphery of the area under clearance.
This work is deemed
to be included in the earthwork
item rate and no separate payment will be admissible.
ROOTS AND
VEGETATION CLEARANCE
The roots of trees if any shall be removed to a minimum
depth of 60 cm below ground level or a minimum of 30
cm
below formation level whichever is lower and the hollows filled up with earth leveled and rammed. This
work is deemed to be included in the earthwork items and no separate payment will be admissible for the work.
Any material obtained from the site will be the property of the Government of India and
the
useful materials as decided by the Engineer-in-charge will be conveyed and properly
stacked as directed within
the lead
specified.
SETTING OUT AND MAKING PROFILES
Masonry or concrete pillars will be erected at suitable points in the area to serve as benchmarks for the execution
of
the work. These benchmarks shall be connected with G.T.S. or any other permanent benchmark approved by
the
Engineer-in-charge. Necessary profiles with pegs, bamboos and strings or Burjis shall be made to show
the
correct formation levels before the work is started. The contractor shall supply labour and materials for
setting out and making profiles and Burjis for
the work at
his own cost
and the same shall be maintained during the excavation work. The Department will show grid co-ordinate or other reference points. It shall be the responsibility
of the
contractor to
set out center
lines correctly with reference to the drawings
and
install
substantial reference
marks.
Checking
of such alignment by t he Department will not absolve the contractor from his responsibility to execute the work strictly in accordance with the drawings.
EXCAVATION
The contractor shall notify the Engineer-in-charge before starting excavation and before the ground is
disturbed, to enable him to take existing level for the purpose of measurements. The ground levels shall be
taken at 5 to 15 metres intervals in uniformly sloping ground and at closer
distance
where local mounds, pits, or
undulations
are
met with, as directed
by the Engineer-in-charge. The ground levels shall be recorded in field books and plotted on plans, which shall be signed by the Contractor and the Engineer-in-charge, before
the
earthwork is
actually started. The labour required for taking levels, shall be supplied by the Contractor at his own cost. The Contractor shall perform excavation in all types of soils, murrum, soft and hard rock, boulders
etc. in foundation, over areas and in trenches to widths, lines, levels, grades and curves as shown in the drawing or lesser widths, lines, levels, grades and levels as directed by the Engineer-in-charge and per items in the
schedule of quantities.
The item in the schedule of quantities shall specify the excavation in trenches or over
areas. For this
purpose, the excavation for any depth in trenches for foundation not exceeding
1.5m in width or 10sqm. on plan
shall be described as excavation in foundation trenches.
Excavation exceeding 1.5m in width as well as 10sqm. on plan (excluding trenches for pipes, cables etc.) and exceeding 30cm in depth shall be described as excavation over areas.
Excavation exceeding 1.5m in width as well as 10sqm. on plan but not exceeding 30cm. in depth shall be described
as
surface Excavation.
