Shop drawings for pile layout and pile details are submitted for approval .Pile centers are set at site as per grid lines and deviations. 
Short steel bars 12 mm diameter and 500 mm up to 1500 mm length are driven at every pile center. Pile centers are inspected and  approved before commencing any drilling works. The piles will be constructed in each area from a working platform level, as mentioned in the consultants drawings.
A suitable, firm and leveled  area is required for the piling plant and equipment. setting of pile positions on the ground after that is  performed according to axes of piles.