Posted: 08/08/2014 at 14:38
In days gone by it would have been put on the garden.
If there are any bugs in there they must be all yours after 4 years. No worries. Here in the sticks we have septic tanks and a much closer relationship with it all
Keep the manhole where you can get at it, covering it with soil is always a poor choice. (I realise that wasn't you)