I am removing asphalt from a road. The plans don't specify a depth of existing and the pay item is per SY removal. I usually figure existing to be 4 to 6 inches when it doesn't specify. I am running into asphalt that is 8 to 12 inches thick. How do I present this to the owner? Obviously it is taking additional trucking time, machine time, and we are using a breaker when typically we wouldn't. I am confident in my additional cost calculations - my question is how to present it to the owner (a municipality) without getting it on the defensive.