Free heavy clay soil?

[dornfield]

I would like to stop progressive erosion of the banks of a little river (not so little in the recent rains!!) and want to compact heavy clay soil behind the revetments I intend to install. This would replace material lost to erosion. About 100m of bank, so perhaps 10m^3 or so of material.
How do builders dispose of heavy clay soil generated during foundation works, and how would I go about obtaining a decent load of such clay soil (the higher the clay content the better), ideally at low/ no cost?
Do builders do this? I am guessing disposal of such material may represent a cost to builders under normal circumstances?

 

[mikeey84]

I would speak to your local waste management firm, as I imagine they deal with it.

Given the work you plan, I take it you are involving the relevant local authority? I understand most riverbank work needs some sort of assessment/permission

 

[dornfield]

Yup. I've contacted the Environment Agency, and I'm very sensitive to using natural materials that can become colonised with native riverbank vegetation. I've also reached out to an organisation at Cranfield (the name escapes me for the moment but paraphrasing they are the 'Riverbank Restoration Centre'. Actually, that sounds right). I'll certainly get advice because I want any work to hopefully last decades, and if I just launched in in my normal 'enthusiastic, but rubbish' manner, it would not last. And would look dreadful.