All excavation operation shall include excavation and taking out the excavated material and depositing it beyond a specified distance away from the edge of excavation. Excavation shall be done from top to bottom. Undermining or undercutting shall not be done.
In firm soils the sides of trenches shall be kept vertical upto a depth of 2 meters from the bottom. For greater depths, 50 cm steps on either side for every 2 members depth shall be provided. Alternatively, the excavation can be done with a slope 1 horizontal to 4 vertical. For soft, lose or slushy soils the width of steps shall be suitably increased or sides stoped or the soil stored up. During excavation the natural drainage of the area shall be maintained.
The excavation shall be done true to levels, slope, shape and pattern indicated in approved drawings. SoWdefective spots at the bed of foundation shall be dug out and suitably filled. Any excess excavation of the foundation bed shall be suitably filled.
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