-----Original Message-----
From: Luke Steer [mailto:luketreescapes@xxxxxxxxxxx.com]
Sent: 28 February 2008 07:38
To: UK Tree Care
Subject: Re: FORGOTTEN RPA SHAPES
Hi again,
I found the following message from Richard Nicholson in the archive.
http://www.tree-care.info/uktc/archive/2006/msg00104
Luke
Luke Steer <luketreescapes@xxxxxxxxxxx.com> wrote:
Hi Bill,
The temptation is always there to offset the RPA and I'm sure that we have
all tweaked them on the odd occasion. The bit in brackets of Section 5.2.4
a) of the standard says:
"For individual open grown trees only, it may be acceptable to offset the
distance by up to 20% in one direction)."
What is your interpretation of that. Is the tree in the central
reservation open grown if there are no other trees close to it. I, maybe
incorrectly, always understood it to mean open grown trees with equally
rootable soil in all directions.
Regards
Luke Steer
Chartered Forester - Arboricultural Consultant
Morning Luke, Bill and Andy,
My interpretation of the offset rule seems to be the same as Luke's and
RN's. I personally don't think the offset should be in the BS at all, but
that's just my opinion.
I can't see that it could possibly apply to the central reservation tree
described by Bill as the root system is clearly not open grown.
If we start shifting RPA's to accommodate site layouts, we loose all
credibility. We should map the RPA's on the TCP in the most appropriate
position based on our judgement as Arb's. If we then say to the architect
we can move the RPA if they need some more room, the architect is going to
think, quite rightly, that the Arb' didn't know what they were talking about
when they set the RPA in the first place.
The RPA is only flexible insofar as it should be modified to reflect the
existing conditions on the un-developed site. The layout then has to work
around or with this constraint.
If consultants are shifting RPA's to allow un-constrained development, they
are failing in their obligation to provide objective and accurate
information to the client. In my work, I set the TCP and define the AIA,
not the architect or the artichoke or the client. On the few occasions when
I have been pressurised by a client to modify a TCP, I have walked away from
the job. As a result, my clients know that if I support their application,
it should go through, and I that I am willing to defend the application
through the appeals process if necessary.
Best regards,
Mark Carter
MICFor. M.Arbor.A. Dip. Arb. (RFS)
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16:34
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