Is this soil compact enough?

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Hello,

As part of a DIY project (steps to the house) I'm currently using an earth tamper (see pic) to compact subsoil on top of which I'll lay a 75-100mm layer of hardcore and then concrete flags on top of that (with a mortar joint between the hardcore and the flags). My question pertains to the subsoil which I'm currently trying to pack down. Some of it has been brought across from a different level and after compaction when I stand on it, I still sink into it somewhat. Is this normal or is it something to worry about?

IMG_E8122.JPG
 
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I’d say that’s normal, are you using a membrane between the soil and your hardcore?
 
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I’d say that’s normal, are you using a membrane between the soil and your hardcore?
Thanks you. I wasn’t going to place a membrane as it’s subsoil below and to the sides I WILL place plastic edging. Should I though?
 
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