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One possible procedure for analysing vapours in a borehole would be to draw the vapour into a "Tenex" diffusion tube by means of an attached pump and then requesting a laboratory to test the tube for absorbed petrol and diesel range organics by GC-MS. 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] 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