Hi Lawrence,
We have recently dealt with a similar situation regarding high pH
(>11.5) lime stabilised Thanet Sands and were able to demonstrate to the
EA that it was not hazardous by carrying out Corrosivity/Alkali Reserve
test (carried out at the EA lab). Results were below the threshold set
by the EA (<10% concentration of irritant compounds (CaO/CaOH) as I
recall) and on this basis the EA agreed that it would not be considered
hazardous.
Hope this helps. Let me know if you need any more info and I will get
someone to contact you.
Kind regards
alan
Alan Crossfield
Senior Contaminated Land Consultant
Delta-Simons Environmental Consultants Ltd
Direct Line: 01522 882558 Mobile: 07887 635170
Switchboard: 0870 0400 012 (ext 4558)
Fax: 01522 882567
-----Original Message-----
From: Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of
Lawrence Bowden
Sent: 11 April 2008 11:08
To: [log in to unmask]
Subject: Re: remediation
Morning All,
Another Friday teaser!
We currently have a site where, as with many redevelopments, the crushed
concrete from the former development has been reused on site in the
interest of sustainability gaining BREAM points etc.
The issue is that chemical testing of the arisings for piles, ground
beams etc has shown the material to be Hazardous based on the elevated
pH (>pH11.5) of the material thus classing it as H8 Corrosive / Irritant
under the Hazardous Waste Regs. The classification of the material as
hazardous based on high pH is, one assumes, purely based on the fine
crushed concrete being selected for the pH testing yielding a high pH
due to the alkaline mineralogy, though this may not be representative of
the site condition nor sustained over a long period (i.e. an initial
flush).
This is posing significant difficulties on this site as the cost of
disposing of the surplus material as hazardous from the site is
obviously very high.
Does this mean that on any site where crushed concrete may be used in
the interest of sustainability these issues are going to arise? and that
such an approach should be avoided?
Any thoughts will be welcomed, especially if anybody has any suggestions
as to how to get round the problems on the current site.
Thanks
Lawrence
Visit our web site at www.scottwilson.com
Privilege and Confidentiality Notice.
This e-mail and any attachments to it are intended only for the party to
whom they are addressed. They may contain privileged and/or
confidential information. If you have received this transmission in
error, please notify the sender immediately and delete any digital
copies and destroy any paper copies.
Thank you.
The ultimate parent company of the Scott Wilson Group is Scott Wilson
Group plc.
Registered in England No. 5639381
Registered Office: Scott House, Alencon Link, Basingstoke, Hampshire,
RG21 7PP
|