Floods last year deposited 500 tonnes of soil on the site.

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The information provided by MDCH and the MDEQ indicates most of the soil contamination at the site has been removed.

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In this instance, the designers envisioned in situ bioremediation, a process in which lingering toxic contaminants are cleaned up by soil microbes at the site.

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's atomic watchdog, the International Atomic Energy Agency, has reported that soil samples taken at the site showed large traces of processed uranium.

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In total 200, 000 tonnes of soil material was treated on site.

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He said the soil quality on the new site was not yet known but there had been a suggestion it had previously been used as arable land.

BBC: Leatherhead allotment site development sparks row

The development of a hundred and thirty-eight acres at the junction of two major interstates was a challenge because a hundred and fifty thousand tons of contaminated soil had to be removed before the project on the site of the old steel mill could even begin.

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The site was transformed from old garages on the estate in 2009, and began with some soil-filled builders' bags.

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But allotment holders who have set up a Facebook campaign opposing the plans said the alternative site being offered was too remote, too far away, too close to the M25 and has poor soil.

BBC: Leatherhead allotment site development sparks row