What are the federal and state biosolids restrictions on land application sites?
The requirements address a number of areas. Among them: animals cannot be grazed on land until at least 30 days after application of biosolids; food crops whose harvested parts touch the biosolids/soil mixture and are above the land surface cannot be harvested until at least 14 months after land application occurs; and when the biosolids remain on the land’s surface for four or more months before mixing into the soil, food crops with harvested parts below the land’s surface cannot be harvested until at least 20 months following application. This stretches to 38 months when the biosolids remain on the land’s surface less than four months before being incorporated into the soil.
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