i) Single stroey buildigs : Building covering an area of four hectare, require atleast five bore holes. One at ii) Multi stroey buildigs : for Multi stroey buildig the bore holes should be at all the corners and also at an important locations. The spacing between bore hole is between 10 to 15 meters. iii) Earthen dam: Boring may be made at 30 to 60 meters, spacing along the top of the up stream face of the dam and across one or both abutments. iv) Concrete Dam: For concrete dams bore hole should be in between 40 to 80 meters. v) Highway : In highway , bore holes are usually made along the proposed center line of the road and spacing may be about 300 to 350 meters. vi) Airport: In case of air ports , boring should be along the center line and along each edge of the runway. Spacing between bore holes should be 25 to 30 meters. vii) Borrow pits : Spacing netween holes should be in case of borrow pits 25 to 30 meters.