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The footage, posted online by YouTube user Ryan Patrick Early, shows the two staff members emptying the septic tank of their camper van in a lay-by by the side of California State Highway 330, attempting to wash the contents away using a hose.
A spokesperson for the race said that it would be consulting with the UCI over what sanctions would be appropriate.
In its guide for race organisers, the UCI states that “the inappropriate management of harmful environmental effects relating to the organization of a cycling event may not only severely damage the reputation of the event itself but can also be detrimental to the sport of cycling in general”, although there are no specific guidelines relating to incidents of this kind.