Sara Fairen Oct 1, 2018:

It means to protect the profiles and the areas excavated with plastic sheets or more usually geotextile previous to refilling with soil, once the excavation is finished - in this case "revertir las alteraciones" must mean not leaving an open hole, since archaeology is in itself destructive and it cannot be reverted.
It means that if the excavation is reopened in the future it is easy to get rid of the soil to get to the level where the work stopped.

philgoddard Oct 1, 2018:

I was thinking "while the excavation is being carried out", but yes, it's more likely to mean afterwards, replacing the soil that's been removed.

carrbriz (asker) Oct 1, 2018:

pues eso es lo que creo que tiene que ver con cubrir la zona ya excavada, o mientras la estan excavando. Alguna sugerencia en ingles?

philgoddard Oct 1, 2018:

It presumably means "cover", but I don't see how that would help to "revertir las alteraciones".