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Hi Neil,
 
I would of though the stabilisation might release more CO2 for a period?  Depends on the binder?  With regards to releasing all the gas, that depends on what the potential is for further gas generation and dependant of the constituents of the made ground.
 
Maybe ask them to do some post stabilisation gas monitoring prior to starting to build.  If it does what they say it does, then maybe no gas protection measures are required, if it doesn't then they need to reconsider their position.
 
Remember the new CIRIA guidance on ground gas will change the way we approach gas risk assessment and may have a bearing on low gassing sites.
 
Merry Christmas,
John Naylor
Senior Environmental Protection Officer
Bury M.B.C.

(: 0161 253 6392
&: 0161 253 5563
*: [log in to unmask]
+ Environmental Services, Textile Hall, Manchester
      Road, Bury BL9 0DG
8     www.bury.gov.uk

  
-----Original Message-----
From: Contaminated Land Management Discussion List [mailto:[log in to unmask]] On Behalf Of Brown, Neil
Sent: 21 December 2006 11:32
To: [log in to unmask]
Subject: Ground gas remediation

We have a development site overlain by approximately 3m of made ground. Ground gas investigation has shown that the site is producing between 0 - 3% methane and 0 - 5% carbon dioxide over 3 rounds of monitoring.

The made ground requires stabilisation before the development goes ahead. The stabilisation involves excavating the made ground, conditioning with a binder agent (including lime) and replacing in compacted layers.

The developer's engineers are stating that any trapped ground gas will be released during the excavation and any further carbon dioxide generated will react with the lime to from an inert compound. They therefore consider that gas preclusion measures are not required.

Does anyone have any experience of this technique and whether it actually works? My feeling is that validation would be required once the made ground has been compacted and the platform is ready for development.

Any help would be appreciated.

Merry Christmas and Happy New Year to everyone!

Neil

Neil Brown
Contaminated Land Officer

Development Planning
Development and Regulatory Services
West Lothian Council
County Buildings
LINLITHGOW
West Lothian EH49 7EZ
Tel. 01506 775263
Fax. 01506 775265
Email. [log in to unmask]



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