Why do you need to use a herringbone pattern?
New to me.. thought it was for regularly spaced grid of data.
--
Adam Czarnecki
Head of GeoEnvironmental Division
Clancy Consulting Ltd.
Dunham Court
2, Dunham Road
Altrincham
Cheshire
WA14 4NX
Tel: 0161 613 6000
Fax: 0161 613 6099
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-----Original Message-----
From: Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Gareth
Rees
Sent: 07 September 2007 09:01
To: [log in to unmask]
Subject: Re: CLR7 Test
Just a note as no one has asked and I see it so often,
Have you used non targeted sampling with a herringbone layout? If you
havn't the use of clr7 is inappropriate anyway
I have had so many arguments with consultants about this it is
unbelievable.
cheers
Gareth Rees
Contaminated Land Officer,
Harborough District Council,
Tel: 01858 821174
-----Original Message-----
From: Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Tammy
Sullivan
Sent: 06 September 2007 20:49
To: [log in to unmask]
Subject: Re: CLR7 Test
Adam -
I would look at your averaging areas and see if you don't have samples
from 2 or more populations. Are your outliers near each other
spatially? If so, you need to redefine your averaging areas and
recalculate your statistics. Additionally, have you looked to see if
your sample population has a distribution other than a normal
distribution - log normal, etc.?
Regards,
Tammy
-----Original Message-----
>From: Adam Czarnecki <[log in to unmask]>
>Sent: Sep 6, 2007 4:47 PM
>To: [log in to unmask]
>Subject: CLR7 Test
>
>A simple one for you...
>
>If you perform a CLR7 test and determine that for example the upper
95%ile
>estimate of the population mean for arsenic is below the site specific
>remedial rarget of 20mg/kg (residential end use) what would you report
if
>five(out of a dataset of 50) of the sampled concentrations are
outliers?
>Assume that the development is part of a planning application, not a
Part
>IIa determination and that all samples are from a topsoil material at
0.5m
>depth.
>
>Would you:
>
>a) Determine that there is a need to investigate the outliers as they
>represent contamination hot-spots; or
>
>b) Determine that there is no need for any further assessment.
>
>We (as consultants) are facing different interpretations of the CLR7
test
>from local authorities and have also peer reviewed a fair number of
other
>consultants reports which also have varying opinions.
>
>Adam
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