A single-acting steam hammer (Vulcan 08 model) is used to drive a 400 mm diameter and 20 m long precast concrete pile into the ground. The following data are recorded:
● Weight of ram = 35.6 kN
● Stroke (height of fall of the ram) = 1.0 m
● Maximum rated hammer energy = 35.6 kN?m
● Hammer efficiency = 0.8
● Coefficient of restitution = 0.4
● Weight of pile cap = 5 kN
● Number of blows recorded for the last 25 mm penetration = 6
● Unit weight of concrete = 24 kN/m³

Determine the allowable load for the pile, with a factor of safety of 4, using the modified ENR formula.