Not sure what city your in but, there are arbitration groups all over the place.
Generally, they pull together 3 people, two that are in a similar industry and the third from outside. They have the authority, because you agree ahead of time, to make their ruling final and binding.
They doing a search on the net. If that doesn't work I'd start calling attorneys and ask them.
BTW, what type of business is this ?
Waste Disposal Company.