A law suit for bad soil? That is un-earthly. Land as it is wild has many types of mineral forms that provide food source for many type of wild plants. Weeds, are wild plants and are found in grasslands of all kinds. To get rid of them you just have to pull them out from the root until they stop growing. You cannot fortell if the grass provided will be safe from weeds or contains the seed for a particular weed. It also depends on the soil type. It might contain crumbs and leftovers of weeds unseen to te naked eye. Renewed treated topsoil and pre-cultured grass has to be provided.