EPA developed this soil fumigant buffer zone calculator as a tool to aid applicators, growers, enforcement personnel and others to determine the buffer zone distances required by soil fumigant labels. The certified applicator supervising the fumigant application must read the product label and verify that the inputs for the application methods, rates, block sizes, buffer zone credits, and calculated results are consistent with the specific product label that is going to be applied before the application begins. If there are any discrepancies between the results of the calculator and the label, the label must be followed.