Which of the following would be considered a no-contact activity in a pesticide-treated area where the REI has not expired?

In a pesticide-treated area where the Restricted Entry Interval (REI) has not expired, certain activities are classified as no-contact based on the level of exposure to pesticide residues. Operating a tractor from an enclosed cab is considered a no-contact activity because the enclosed cab provides a barrier that protects the operator from direct exposure to pesticides present in the treated area.

The REI is established to ensure that individuals are not exposed to potentially harmful pesticide residues immediately after application. Activities that involve direct contact with the treated area, such as performing hand labor, could lead to significant exposure and are therefore not allowed during the REI. Although limited-contact irrigation might seem less risky, it can still involve some degree of exposure to pesticide residues, making it unsuitable for a no-contact designation. Adjusting or repairing the pesticide sprayer similarly involves direct interaction with equipment that may still have pesticide residues, which likewise excludes it from being no-contact.

Thus, operating a tractor from an enclosed cab is the only activity among the choices that inherently minimizes the risk of exposure, fulfilling the criteria for a no-contact activity under the specified conditions of the REI.