Back-filled with anything possible many years ago , not to mention the old pier rafters still in place this microtunnelling job had it's challenges. This was also a free bore with the sewer pipe being pulled in after the bores were drilled. Average length of the bores was 46m. Pipe diameter 300mm. All 256m of tunneling was completed in record time for MIRVAC. Photos show ground conditions.
All bores were for sewer and were spot on for line and grade.