about 1 8 m 6 ft deep and 1 8 m 6 ft in diameter with a compacted aggregate bottom 98 90 mp to 1 68 m 66 in below the predicted finished grade level the top of the anchoring member 18 exceeds the finished grade predicted level by about 65 mm 2 5 in the next step consists of backfilling the hole using successive layers of compacted aggregate 100 from bottom up to the beginning of the notches 26 at 500 mm 18 in it is recommended to verify that the anchoring member 18 is plumb straight while compacting it is also recommended to backfill with well distributed aggregates of crushed stones 0 20 mm 0 u00be in compacted at 90 a grounding rod not shown with a grounding cable not shown is then installed thereafter the wire conduits 28 are installed for the various networks to be incorporated the wire conduits 28 are preferably attached to the anchor member 18 with attachment straps not shown extending through the holes 34 in the anchor member 18 thereafter the excavated hole is full with flowable concrete 102 up to between 125 to 150 mm 5 to 6 in below the finished grade if the quantity of.