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Robin, The USEPA do suggest stabilisation parameters, which can be found by doing a quick google search for low -stress (low flow) groundwater sampling methods. Kind regards, Martin Weil BSc(Hons) MA C.WEM CSci CEnv Senior Consultant, Geo-environment Architecture, Environment & Planning Property and infrastructure Capita, Capita House, Wood Street, East Grinstead, RH19 1UU Tel: 01342 327161 Email: [log in to unmask] Website: www.capita.co.uk/property <http://www.capita.co.uk/property> Linkedin: <http://uk.linkedin.com/pub/martin-weil/1/189/724> We | Listen Create Deliver From: Contaminated Land Management Discussion List [mailto:[log in to unmask]] On Behalf Of Robin MacKenzie Sent: 04 March 2014 12:26 To: [log in to unmask] Subject: Well Development and Purge Volumes Dear All, Thank you all for all the overwhelming feedback which is interesting. Things have moved on since I first slung a bailer down a well, wondered what I was trying to accomplish and hoped for the best. Very conflicting guidance and opinion out there and have reviewed the literature from the links that have come back to me. We have 7 203mm wells with a 50mm ID standpipe and it seems to be a dilemma if you purge the volume of the pipe or include the volume (in need of a vacuum tanker for the disposal) in the gravel pack @ 203mm. I have based on the feedback and guidance, plumped for a compromise of purging 5x the standpipe volume which should I hope give representative conditions within the aquifer without busting the bank on waste disposal. Then on, we will revert to Low Flow and no purging although this will bring out its own set of challenges in the long screened wells so we are setting up two channels within each well. The source is predominantly DNAPL tars , in the shallow sub surface and as deep as 18m at point. Once again many thanks to those who responded to my question and I will post on how things go during the monitoring. I might keep this going on the Linkedin site, which you are welcome join. http://www.linkedin.com/groups?home=&gid=4378537&trk=anet_ug_hm Kindest regards, RMack. Robin Mackenzie Land Quality Team Co-ordinator [log in to unmask] Environment Service Perth and Kinross Council Pullar House 35 Kinnoull Street PERTH PH1 5GD Mob: 07810057566 Tel Direct Dial: 01738 476443 Fax: 01738 476410 Click here <https://www.mailcontrol.com/sr/MZbqvYs5QwJvpeaetUwhCQ== WmaRN2uxz1bpHz3qXdBvd5YzJCuAuYGPmVKiyla!1rT5xQ==> to report this email as spam. Securing the future... - Improving services - Enhancing quality of life - Making best use of public resources. The information in this email is solely for the intended recipients. If you are not an intended recipient, you must not disclose, copy, or distribute its contents or use them in any way: please advise the sender immediately and delete this email. Perth & Kinross Council, Live Active Leisure Limited and TACTRAN do not warrant that this email or any attachments are virus-free and does not accept any liability for any loss or damage resulting from any virus infection. Perth & Kinross Council may monitor or examine any emails received by its email system. The information contained in this email may not be the views of Perth & Kinross Council, Live Active Leisure Limited or TACTRAN. It is possible for email to be falsified and the sender cannot be held responsible for the integrity of the information contained in it. Requests to Perth & Kinross Council under the Freedom of Information (Scotland) Act should be directed to the Freedom of Information Team - email: [log in to unmask] General enquiries to Perth & Kinross Council should be made to [log in to unmask] or 01738 475000. General enquiries to Live Active Leisure Limited should be made to [log in to unmask] or 01738 454654. General enquiries to TACTRAN should be made to [log in to unmask] or 01738 475775. Securing the future... - Improving services - Enhancing quality of life - Making best use of public resources. This email and any attachment to it are confidential. Unless you are the intended recipient, you may not use, copy or disclose either the message or any information contained in the message. If you are not the intended recipient, you should delete this email and notify the sender immediately. Any views or opinions expressed in this email are those of the sender only, unless otherwise stated. All copyright in any Capita material in this email is reserved. All emails, incoming and outgoing, may be recorded by Capita and monitored for legitimate business purposes. Capita exclude all liability for any loss or damage arising or resulting from the receipt, use or transmission of this email to the fullest extent permitted by law.