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CONTAMINATED-LAND-STRATEGIES  June 2018

CONTAMINATED-LAND-STRATEGIES June 2018

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Subject:

Re: Reality check - asbestos in soils

From:

Robert Tyler <[log in to unmask]>

Reply-To:

Robert Tyler <[log in to unmask]>

Date:

Mon, 4 Jun 2018 13:49:18 +0000

Content-Type:

multipart/related

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text/plain (62 lines) , image003.jpg (62 lines) , image002.jpg (62 lines)

That is my experience unless there is an obvious localised source.

Thanks

Robert



Sent from my Samsung Galaxy smartphone.


-------- Original message --------
From: Nik Reynolds <[log in to unmask]>
Date: 04/06/2018 14:43 (GMT+00:00)
To: [log in to unmask]
Subject: Reality check - asbestos in soils

Right, Monday morning is over, and a quick call round peers to check to see if my thoughts are completely at odds with best practice.

Asbestos in soils!!!

Where site have been remediated, I have seen several consultants who will remain unnamed who state that where fibres (individual/bundles…) are encountered, these may be treated by removing a zone of soil several metres around the positive findings (essentially digging out the trial pit position).  The madeground generally in question is ubiquitous across a site and possibly has multiple sources, and process histories.

In my understanding, in madeground where fibres are encountered, these should not be considered as ‘hotspots’ and removed where encountered.  In my understanding, significant statistical and stratigraphic information should be obtained for the material to determine why it is present and whether it is common in madeground streams from various sources/or through site practices where multiple madeground units have been intermixed.  Hence, rather than a ‘hotspot’ (typical for an oil tank spillage where there is a single source), the whole stratum is anticipated to be impacted.  Significant statistical assessment may be made to determine the extent of risk associated – which would require a vast number of samples from multiple stratum and depth.

By digging out a position where asbestos fibres have been encountered in my understanding was not an appropriate method of ‘remediating’ or ‘risk assessing’ asbestos in soils.

I am willing to withstand a barrage of emails to say that I have been out in the sun too much at the weekend and my brain has been boiled!

[CGeol-Logo-template]Kind regards
Nik

Mr N Reynolds
BSc(Hons), MSc, CGeol, CSci, FGS, MIEnvSc, EurGeol, QP060
Senior Environmental Geologist
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