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

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We | Listen Create Deliver

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

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Environment Service

Perth and Kinross Council

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