Enquirer

Dear Micky,

I am trying to compile a quick study into the costs of bioremediation of diesel contamination within shallow groundwater/soil.

What I am trying to produce is a ball park range of figures for remediation costs based upon a square metre surface area basis.

Whilst I appreciate that there are many variables dictating costs at least a ranged cost estimate could be given. the reasoning behind this is to be able to give clients a 'feel' for costs.

Any information would be gratefully received.

Marc

Dear Marc

Bioremediation using bacteria plus nutrient plus oxidiser in carbon pellets, that are injected into the ground using wells at 1-2 metre intervals costs around £ 20 per cubic metre

However I don't have a figure for a square metre surface area basis so :-

2nd response

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Dear Micky

I assume that you are exclusively referring to insitu remediation, as the request is to provide costs on a square metre basis, rather than per excavated cubic metre as ex situ.

My experience over the last 15 years in Europe and the UK for Shell, BP, Fina, Total and Texaco is that :-

1. a typical average petrol station forecourt is 50m x 50m in size
2. the treatment period is 6 to 12 months following installation and commissioning
3. cleanup of diesel/petrol contamination would range from £30,000 up to £100,000
4. this translates to a square metre cost range of £12 to >£40 (depending on the degree of site complexity)

This ballpark figure, it must be stressed, depends on the specific site conditions (underlying geology, hydrogeology, stratigraphy, depth to groundwater piezometric surface etc)

Trust this has been of some help.

Best Regards