UKTC Archive

Re: Gabion wall within RPA

Subject: Re: Gabion wall within RPA
From: S Roberts
Date: Jul 22 2020 19:03:02
Hi Lee,

I recently produced an AMS for a similar situation - a gabion retaining
wall spanning a portion of the length of a HoPI Deciduous Woodland and
located within its RPA (and canopy edge).

If memory serves, there was a foundation scrape (the exact depth i cannot
recall off the top of my head, but I can find out if its useful?). We
specified that this was carried out under Watching Brief so that if any
significant roots were found they were not damaged. We specified the
foundation scrape was dug by hand too I believe.

I agree the impacts on the tree from the wall itself will be minimal and
not result from a reduction in air and water filtration. The impacts from
soil compaction related to the wall itself would also be minor i think
(only associated with the footprint of the wall itself) - the main
consideration in terms of soil compaction would be the use of plant, heavy
machinery etc. in constructing the wall, which should of course be excluded
from the RPA. We also specified that the gabion baskets were filled by hand
for this reason.

The main impacts would be from direct root damage / severance as a result
of excavation for the foundations, in my experience.

Hope my rambling is of some use.

Thanks
Sean


On Wed, 22 Jul 2020, 18:12 Lee Davies, <leemdavies01@xxxxxx.com> wrote:

Hi all,

I have been asked to assess the impact of installing a gabion wall with the
RPA of a neighbour's tree and was wondering if anyone has had experience of
this?

I am assuming that because the stones will allow water and air infiltration
that the wall wont have any significant impact on the tree?

In terms of soil compaction, should a no-dig foundation using Cellweb or
similar be specified to spread the load of the wall?

I look forward to hearning your thoughts.

Thanks,

Lee



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