What about a landscaping worker using a nearby wooded ravine to relieve himself?

It's rather a delicate matter, but this has posed a real dilemma for me. It was not possible, for various reasons, including the preference of the landscaping company, for the workers to have access to my home to use toilet facilities. And they did not provide a port-a-potty of any sort. I asked what the men were supposed to do about this and was told that they knew to drive to a nearby location or back to the main office when they needed to use the bathroom. But one, in particular, did not. There are a number of houses nearby and children often play in that area (I'm pretty sure this was not a matter of urination alone, as he was absent for a longer period of time than that would presumably require!), so my gut feeling is that human waste should not be left there. But am I making too much of this? Just let it go?