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It turns out this was a UPS load and their facility is gigantic. To wit:
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Just entering the facility involved some phone calls, a bright reflective vest and other goodness. The guard doing the cavity check was surprisingly gentle, though.
Afterward, I was directed a few miles away to a dropyard and had my choice between a dry van trailer with some air hose problems or an unwashed reefer unit with the remnants of a load of broccoli strewn about inside. Broccoli was the winner and I was directed to a washout facility in Ottawa to deal with the issue.