Specification Part 3 - Road & Bridge Works - Urban Administration ...

and prevention of ponding of water.
19. The area of the embankment foundation should be kept dry. Test the material (soil)
for its suitability for use in the embankment at least seven days before commencement of
earthwork. Tests should include soil. classification test data and data regarding maximum dry
density, OMC, and CBR (soaked and unsoaked).
20. For widening of existing embankment start earth work from toe line.
21. Do not allow borrow pits within a distance equal to the height of the embankment
subject to a minimum of 1.5 m from the toe of the road embankment.
22. Do not allow construction or other vehicular traffic over the prepared surface of
embankment/ sub-grade.
23. Do not allow dumping of earth from top to widen an existing embankment.
306. SOIL EROSION AND SEDIMENTATION CONTROL.
306.1 General
This work shall consist of measures as shown on plans or as directed by the Engineer-in-charge
to control soil erosion, sedimentation and water pollution, through use of berms, dikes, sediment basins,
fibre mats, mulches, grasses, slope drains, and other devices.
306.2 Materials
All materials shall meet commercial grade standards and shall be approved by the Engineer-incharge
before being used in the work.
306.3 Construction Operations
Work shall not be started until the erosion/ sedimentation control schedules and methods of
operations for the applicable construction have been approved by the Engineer-in-charge. For above
the contractor shall submit to the Engineer-in-Charge for approval his schedules of work. He shall also
submit for approval his proposed method of erosion/sedimentation control.
307. TURFING WITH SODS
307.1 General
This work shall consist of furnishing and laying of the live sod of perennial turf forming grass on
embankment slopes, verges (earthen shoulders) or other locations shown on the drawings or as
directed by the Engineer-in-charge. Unless otherwise specified, the work shall be taken up as soon as
possible following construction of the embankment, provided the season is favourable for establishment
of the sod.
308 SEEDING AND MULCHING
308.1 General
This shall consist of preparing slopes, placing topsoil, furnishing all seeds, commercial or organic
fertilizers and mulching materials, providing jute netting and placing and incorporating the same on
embankment slopes or other locations designated by the Engineer-in-charge or shown in the Contract
documents.
309 SURFACE/SUB-SURFACE DRAINS
309.1 General
The work shall consist of constructing surface and/or sub-surface drains in accordance with the
requirements of these Specifications and to the lines, grades, dimensions and other particulars shown
on the drawings or as directed by the Engineer-in-charge. Schedule of work shall be so arranged that
the drains are completed in proper sequence with road works to ensure that no excavation of the
completed road works is necessary subsequently or any damage is caused to these works due to lack