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One sunny day in 2000 my Mum innocently dispatched my Dad to go to the garden centre by himself. He came back with the lawn fertiliser, which they applied over their 3 lawned areas.
After a few weeks, the only part of the lawn still green was where the watering can had been stood!
At this point, Mum inspected the packet & discovered the words 'WEEDKILLER' emblazoned upon it.
As spring progressed into summer, the once lush green lawn transformed into a mud bath, which naturally the poor dog was banned from.
Hiring a gardener, who had limited skill with turfing, was also another blinding choice, as he proceeded to lay directly on the sodden soil, during the wetter than usual Autumn of 2000.
The lawn quality has never been much good ever since, apart from the verge across the road, which used turf cut out from the original grass.
Whilst that is always, lush & green, the rest of the lawns are always sickly, pale and notably water-logged.
Dad, has been banned from buying anything again.
The "residual herbicide" in it is diflufenican.............. I use Pistol which incorporates it and an area I sprayed 12 months ago is only just beginning to get some small weedgrowth. I guess you could skim off the surface to the right level and then try seeding a very small patch to test whether there's any weedkiller left and explain to the customer the risks of the turfing not working particularly well. .
The question remains where would you dispose of the contaminated soil. Legally I expect you would need to do this through a registered waste processor. I'd decline the work and find something else to make your money on if I were you
Classification and disposal of contaminated soil
http://blog.soilutions.co.uk/2012/08/23/classification-and-disposal...
Its really hard to tell how deep in the soil it has permeated - depends on the type ; sandy, clay etc...
Field studies suggest its DT50 (time for degrading by 50% strength) is approx 300 days...If its not required soon then I would avoid skimming the top layer but rotorvate thoroughly, leave open to the elements to leach as much as possible away and add some rhizobacteria and nutrition to increase soil microbes....still a bit of a guessing game without a lab analysis but it would be weeks and months not years if it was worked on...water (rain) and sunshine (warm weather) will break it down quicker...
Richard@Progreen