Northamptonshire,
United Kingdom 
I have a large mound of top soil on the site of what is to become a rockery. To get the drainage layer in and layer the stone I must remove the mound of soil at least temporarily.
Question:How long can soil be temporarily stored on a tarpaulin on adjacent grass before the grass will be killed or damaged beyond restoration?
9 Nov, 2010
Answers
Storing the soil on the driveway would be a better option.
10 Nov, 2010
Campsites seem to manage 2 weeks or so under peoples' groundsheets. When the tent is taken down the grass looks pretty rank, but usually recovers.
10 Nov, 2010
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Perhaps a week before the grass goes very yellow. It will recover quickly though once it is given access to the light.
I wouldn't leave it more than about 3-4 days as late in the year as we are now ( assuming you are UK) as the grass has almost stopped growing and will take much longer to recover
10 Nov, 2010