Old soak away under driveway

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Hawaii04
Posts: 42
Joined: Sun Mar 13, 2016 11:46 am
Location: Kent

Post: # 112645Post 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.
John
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lutonlagerlout
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Posts: 15184
Joined: Fri Aug 04, 2006 12:20 am
Location: bedfordshire

Post: # 112646Post 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
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Hawaii04
Posts: 42
Joined: Sun Mar 13, 2016 11:46 am
Location: Kent

Post: # 112654Post Hawaii04

Thanks for the info.
John
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seanandruby
Site Admin
Posts: 4713
Joined: Mon Jun 26, 2006 11:01 am
Location: eastbourne

Post: # 112662Post 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.
sean
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