Standpipe Installation after borehole drilling
Standpipe Installation after borehole drilling
(OP)
Hi guys... I've encountered a situation that I finished drilling a borehole to 15m and the driller started backfilling the borehole with dirts/soil coming out of the hole and some sand. As soon as he finished backfilled the hole, I realised that I would still need to install a standpipe to do some GW chemical testing (OMG, I did forget). That measn I will have to drill another hole to put in my standpipe (no SPTs or tubes required, of course).
So here is the question, if I drill the hole right at my old borehole (the one backfilled) location and install the the standpipe, will it affect the GW chemical testing results much ??
My thought is that it'll take less time to drill for the purpose of installing a standpipe because the backfilled materials are loose and it won't contaminate the GW because the materials we backfilled with were from the bore itself and some clean sand. And I can't think of anything that can potentially contaminate the borehole. Also, before we take GW from the standpipe for testing, we purge 3 Volumes of water as well.
So I'm just wondering if it's acceptable to drill at the old borehole location or it's necessary to drill a borehole right next to the old bore (which will take longer time)??
Thanks
So here is the question, if I drill the hole right at my old borehole (the one backfilled) location and install the the standpipe, will it affect the GW chemical testing results much ??
My thought is that it'll take less time to drill for the purpose of installing a standpipe because the backfilled materials are loose and it won't contaminate the GW because the materials we backfilled with were from the bore itself and some clean sand. And I can't think of anything that can potentially contaminate the borehole. Also, before we take GW from the standpipe for testing, we purge 3 Volumes of water as well.
So I'm just wondering if it's acceptable to drill at the old borehole location or it's necessary to drill a borehole right next to the old bore (which will take longer time)??
Thanks





RE: Standpipe Installation after borehole drilling
f-d
¡papá gordo ain't no madre flaca!
RE: Standpipe Installation after borehole drilling
RE: Standpipe Installation after borehole drilling
RE: Standpipe Installation after borehole drilling
Regards,
DRG
RE: Standpipe Installation after borehole drilling
RE: Standpipe Installation after borehole drilling
a bag of bentonite is cheap compared to erroneous results.