Concrete sleeper retainer wall and hole for a ground level trampoline

The concrete sleeper retainer wall is 2m charcoal coloured concrete sleepers with gal H beams.The hole you see the form work in is for a ground level trampoline 4.9m x 2.7m with the depth being formed to Olympic standards.At the bottom of the hole there is in place a pit ( for the submergible pump ) a 40mm high pressure pipe (for pumping out rain water ) and the conduit has been placed for power.