Print

---

On 28 July 2010 at 16:31 Adam Czarnecki <[log in to unmask]> wrote:

> Sampling error will always be very high on most, if not all , brownfield sites and taking duplicates etc is unlikely to have a beneficial effect. Yes to use of lab errors but the use of the numbers will always be masked by the sampling error.
>
> 
>
> Adam
>
> 
>
> Adam Czarnecki
>
> 
>
> Regional Director
>
> VertaseFLI Limited
>
> 3000 Manchester Business Park
>
> Aviator Way
>
> Manchester
>
> M22 5TG
>
> 
>
> Tel. 0161 437 2708
>
> Mob. 07833 478863
>
> email: [log in to unmask]
>
> www.vertasefli.com <http://www.vertasefli.com/>
>
> 
>
> 
>
> 
>
> From: Contaminated Land Management Discussion List [mailto:[log in to unmask]] On Behalf Of Peter Hewitt
> Sent: 28 July 2010 13:58
> To: [log in to unmask]
> Subject: Re: Deviating samples & BS10175
>
> 
>
> Hello
>
> 
>
> Given the recent discussions regarding TPH testing, should we not also be including something in here regarding the standardisation of laboratory testing methods, as this can produce as many variations in test results as deviating samples and is just as likely to "jeopardise the validity of the reported test result".
>
> 
>
> One thing that I think we should be promoting is duplicate and split sampling as proposed by Prof Ramsey, as this allows sampling and lab errors to be quatified.  This proposal should be widely accepted as it provides consultants with a quantifiable guide to the accuracy of testing whilst labs will gain from the additional testing and clients should not object if for the small increase in testing costs (1 per 8 samples) a greater degree of certainty (or a lesser degree of uncertainty) can be acheived.
>
> 
>
> Yours
>
> 
>
> Peter Hewitt
>
> 
>
> 
>
> On 27 July 2010 at 18:03 Mike Hopgood <[log in to unmask]> wrote:
>
> > During a recent presentation I gave at the NECLF in Newcastle on water sampling, the subject of deviating samples  was raised and it became obvious that many of the audience were unaware of the implications . We therefore thought it might be an idea for the subject to be raised in this forum for discussion to get the views of local authorities, consultants, stakeholders etc. with a view to putting forward comments for possible inclusion in BS 10175 ( via the proper channels).
> >
> > Deviating samples
> >
> > UKAS definition: Deviating samples are samples which are not (correctly) preserved, for example they may have exceeded their maximum preservation time, lack the date and time of sampling, are not cooled, have inappropriate headspace and so on. As a result, deviating samples may jeopardise the validity of the reported test result.
> >
> > UKAS now require laboratories to operate the following protocol:
> >
> > Upon receipt of each sample, a competent laboratory shall assess whether the sample is suitable with regard to the requested test(s);
> >
> > - When the sample is deviating, a competent laboratory shall contact the customer for further instructions;
> >
> > - When the customer wants the deviating sample to be analysed, a competent laboratory shall include a disclaimer in the report, clearly stating that the sample was deviating and that, as a result, the test result(s) may be invalid;
> > As a result, laboratories will need to review the condition of the as received samples, some aspects of which  are given below,
> > against the test schedule to ensure that the samples are suitable for the requested tests in accordance with current good practice.
> >
> >
> > a)      Sample container type(s)
> >
> > b)      Headspace in vials
> >
> > c)       Delivery containers (cool box, loose etc.)
> >
> > d)      Delivery temperature
> >
> > e)      Date and time of receipt
> >
> > f)       Date and time of sampling
> >
> > g)      Preservation
> >
> >
> > Regards
> > Mike Hopgood
> > Technical Manager
> > Derwentside Environmental Testing Services
> > Unit 2
> > Park Road Ind Est
> > Consett
> > Co Durham
> > DH8 5PY
> > Tel:  01207 582333
> > Fax: 01207 582444
> > Email: [log in to unmask]<mailto:[log in to unmask]>
> > Website: www.dets.co.uk<blocked::http://www.dets.co.uk/>
> >  This e-mail, including attachments, may include confidential and/or proprietary information, and may be used only by the person or entity to which it is addressed. If the reader of this e-mail is not the intended recipient or his or her authorized agent, the reader is hereby notified that any dissemination, distribution or copying of this e-mail is prohibited. If you have received this e-mail in error, please notify the sender by replying to this message and delete this e- mail immediately
> >
> >
> >
> >
>
> 
>
> Peter Hewitt
>
> Mob: 07840 802366
> Web: www.terrasolve.co.uk
>
> Terrra Solve Ltd
> 19 Kingfisher Way
> Cottenham
> Cambridge
> CB24 8XN
>