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Posted: Thu Mar 09, 2017 3:45 pm
by Hawaii04
Hi. Another question from me I'm afraid. During excavation of my driveway, I uncovered an old soak away which has left a bit of a dip in the profile. I know this soak away has been blocked up for years as I disconnected it and re-routed a new one many years ago. Question is: should I just top up with type 1 when I'm putting the sub base down or can I just back fill with the soil/ chalk which I've excavated and bring it up to the required level. Thanks.
Posted: Thu Mar 09, 2017 5:20 pm
by lutonlagerlout
ideally it should be excavated and filled in layers of type1
in the real world I would cap it with concrete below formation level,never use spoil for backfill
LLL
Posted: Thu Mar 09, 2017 8:56 pm
by Hawaii04
Thanks for the info.
Posted: Fri Mar 10, 2017 8:19 am
by seanandruby
Compact it to refusal. You can cap with chalk, no soil. Cover with a good quality geo grid and then terram on top of that. You can start your formation after that.