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I agree with John Cundall, try using the RBCA methodology. Ray -----Original Message----- From: Darren Detheridge [mailto:[log in to unmask]] Sent: 05 November 2003 16:42 To: [log in to unmask] Subject: Commercial Development on Hydrocarbon Contaminated Soils Has anyone dealt with a commercial development (offices, health center, large retail outlets) on hydrocarbon contaminated soils? If so what values for TPH have you accepted? The developer is arguing that as he is hard surfacing the whole area, he will be mitigating any pathway for contaminants, although i am still concerned for hydrocarbon vapours. I understand that hydrocarbons would be more volatile for lower chain hydrocarbons such as PRO so would it be more appropriate to assess the site according to hydrocarbon fractions? If so, what values has anyone been using for hydrocarbon fractions bearing in mind that the site is to be hardsurfaced with a commercial end use and that hydrocarbon vapours are the main concern? Any help would be much appreciated. Thank you to all those who responded to my previous query, also concerning hydrocarbons. ********************************************************************** The information contained in this transmission may be confidential and may also be the subject of legal professional privilege. If you are not the intended recipient, any use, disclosure or copying of any part of this transmission is unauthorised. If you have received this transmission in error, please notify the originator immediately. www.southoxon.gov.uk ********************************************************************** ********************************************************************** Liverpool City Council Legal Disclaimer This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. Please note that this email message has been checked for the presence of computer viruses. **********************************************************************