Some interesting views here (and for what it's worth I wouldn't put a
similar comment in a report of mine).

May I ask  - Is the concern the sampling density or the way in which the
statement was made?

With regards to the density, many sites don't have tanks or other areas
that may necessitate targeted sampling or site zoning.  Is it always
completely unacceptable to follow a sampling density that is better than
that stipulated by BS10175 for exploratory SI ?  


Chris  



-----Original Message-----
From: Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Ivens,
Rob
Sent: 23 November 2007 12:48
To: [log in to unmask]
Subject: Re: Sampling density.

The glib statement seems a bit off to me.
I wish I could be that certain of anything... my immediate thought is
you need a dmned good reason to have such a wide sampling pattern.

They need to satisfactorily ensure the site is zoned to deal with
previous use.... and their sampling needs to reflect that

1. regardless of their views about sampling they should then use the
conceptual model and target the issues that matter.
2. once the targeted bits are dealt with they can then think about
general background assessment...

Assuming a residential use: I have had a look at some jobs we have done
in the past and and in absence of all other info sampling the grid
started at half to 1/3 of what they are talking about.....

Of cours if they collect enough data up front it helps when going back
and think about hot spots and the variation in the data...

Rob Ivens
Scientific Officer
01306 879232
 

-----Original Message-----
From: Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Clare
Horton
Sent: 23 November 2007 11:45
To: [log in to unmask]
Subject: Sampling density.

Hello everyone,

greetings from Aberdeen.

I wonder if some of you could answer the following:

A Consultant has stated the following:

' It is our experience that a 40x40m sampling density is widely accepted
by Local Authorities as adequate to characterise the risk for planning
purposes for commercial/ industrial end use'.

Would you? I wouldn't but would like a consensus before deciding on my
next course of action.

Thanks,

Clare.



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