Ron, et al:
I see dumping of materials all the time and as you say most 
excavators are actually looking for the "Goodies." This is 
unfortunate! In fact this actually is  more of an example of non - 
professionalism, in my humble opinion, of the excavator. I have gone 
back to "fill" that has been dumped and found some interesting data. 
True, in the interest of a time line for excavating a site speed is 
the norm. By accelerating the speed in excavating there is a danger 
of missing small objects and destroying the provenience which is very 
important especially when trying to reconstruct the site on paper. It 
has been my experience that, "If time runs out we can go back" to 
continue the dig at a later date. Of course I do no CRM for pay and 
what I do has been there for years and will probably stay there for 
years to come. I have also been known to shore up the sides of a 
cistern, dump or outhouse as we lower our levels tagging the profiles 
as we go. Yep, it takes a while longer but I sure hate to miss 
something important.