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Hi Alternety Congratulations on sorting out the problem, but here's a thought to consider: if the clay particles are coming from the 'bentonite' seal in the borehole annulus then this suggests to me that (a) the seal is not a good seal and (b) water is flushing through the 'seal' and bringing...

Hi Cosimo, I agree with bimr on this one. We monitor the Bath Hot Springs system in the UK and the level of iron precipitation is horrendous, particularly for all the monitoring equipment! The only way this is dealt with is by the ongoing program of cleaning and maintenance. Regular...

Hi all. Does anyone have any working experience of inline monitoring systems that can measure Arsenic and Barium levels in water supply pipes? (i.e. a readout display without the need for sampling) Thanks for your time, Dubliner Adam Beresford-Browne Zenith International Ltd zenithwater.com

Hi all. Can someone point me towards UK literature concerning guidance on required thicknesses of imported clean soil with respect to contaminated sites? I need to know what sort of protection needs to overlie mildly contaminated soil so that it could be used as a garden (for example)...

Firstly I am wondering why you would need to inject the water so deep of the water table is shallow. Would a recharge pit not suffice? This would do away with many of your problems as the shallow water is unlikely to be as saline as the water at depth. However, I would like to respectfully...

Hi all. Can someone point me towards UK literature concerning guidance on required thicknesses of imported clean soil with respect to a contaminated site? I need to know what sort of protection needs to overlie mildly contaminated soil so that it could be used as a garden (for example)...

With respect, why do you want to stabilise this soft clay? Where is it and what do you intend to do with it once it is stabilised? Is it for construction? Slope stabilisation? There are so many variables and your post is a little vague. If you clarify your position then I am sure people will...

Take a look at: http://www.geo-slope.com/pub/docs/Info_VADOSEW.pdf Regards

Dear rnancarrow First of all I don't have experience specific to your problem but I may be able to offer some direction. If the bedrock is fractured granite then it may well contain groundwater. As liquid styrene has a density of around 0.9 relative to water (1.0) then it will float on, and...

These last two posts, although helpful, do not point out that the oxidation of hydrocarbon contamination is microbiologically controlled, the addition of electron donors, fuel or warmth merely enhancing the process. In the absence of life these additions would do little (if anything) to break...

Hi Rob A PhD student at the University of Portsmouth was studying the landslides of the Dorset/Hampshire coast and may well be able to point you in the right direction. His name is Andy Gibson. Possibly Dr Andy Gibson by now! The university number is 02392 876543 - ask for Andy Gibson in the...

A bid or estimate of what Kristjan? Can you be more specific?

Dear ngnear The porosity and permeability of your gravels will vary with the sorting of the gravel sizes (generally, same size = higher porosity and better permeability). I suggest you get hold of a copy of "Groundwater" by Freeze & Cherry (Prentice Hall, 1979) from a local library...

I suggest that talking to a locally based Environmental Consultancy may help (and won't cost anything except time!). Try one of these URS offices near you: Colorado Colorado Springs 9960 Federal Drive Suite 300 Colorado Springs, CO 80921 Tel: 719.531.0001 Fax: 719.531.0007 Commerce...

Well Gusuku, I hope things work out for you! Ganbatte!

Gusuku From the pace of your message it seems that time is of the essence here and you have to act quickly. I suggest you subcontract the job to an environmental consultancy and get them to arrange for the removal of the offending soil and UST. There may be a local treatment facility available...

Dear MD7 I am not sure that I understand this but you might... [copied from http://www.krysstal.com/calculus.html] The derivative measures rates of change for functions that are continuous and variable. Functions like this are used extensively in science. If there is a relationship between...

Dear Mike Thank you for your well constructed and helpful reply. I doubt we could afford to hire 'a yank' (!) but thanks for the offer. Regards Adam Beresford-Browne

Thanks for the advice gentlemen; Much appreciated.

CHA Try: www.usace.army.mil/inet/usace-docs/design-guides/dg1110-1-2/ AppF.pdf www.astm.org/DATABASE.CART/PAGES/D1510.htm www.mcilvainecompany.com/newsletters/scnl319/Calgon%20Filtrasorb%20600%20Carbon%20for%20Trace%20Concentrations.htm www.snowblack.com/carbon/ac-properties.htm All the...