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if the pond has a liner remove it or at least take some chunks out of the bottom, hard core compacted every 6 inch then at least 6 inch of top soil on top it is inportant to compact as it will subside over a period of time
If your filling it in with hardcore, take your time & layer it in as flat as you can. Don't just pour in barrow loads of rubbish. As David says, then compact it down. I would infill the gaps between the hardcore with sub soil or something. Just keep layering it up & infilling, compacting. Then top off with 150mm top soil.
There is a risk that, if they are wanting to replace it with lawn, it will never look the same as the rest of the lawn and it will stand out like a sore thumb for years. Especially in the summer. Best to make them aware of that now.
Make sure you empty the pond of all plant matter first. I did a job earlier this year where builders filling a pond just dumped hardcore and soil in without empying it of pond life first and also without breaking the liner. Bit of a nightmare really. Good advice from the other posters. As Neil says infill gaps in hardcore with blinding. I'd use sand and then compat as the wacker will help vibrate it down between the gaps. I'd be tempted to put a bit more soil in upto 12'' and leave it 6 months to settle but that depends on the site, situation and the clients patience. Good luck
As The others have already said with the hardcore etc etc,
only thing to add is that would it be possible to seed the area instead of laying turff ?
this would alow you to overseed the rest of the lawn which might help to tie in the areas together and not end up with a big patch that is a compleatly different seed mix etc to the rest
Yes, that would help. But if the area below the 'patch' is more/less free-draining than the surrounding area it will affect the lawn colour even if it's the same species all the way through. Possibly not immediately but in 2/3 years for sure.