Thanks for all the input and good advice. I think I'll take the approach recommended by JAE above. I've never heard of this requirement on any other projects. I'll leave names out but the engineering firm requiring this is one of the big boys of wastewater engineering in the US. The...
I'm working as a consultant to a contractor for a large WWTP upgrade. The design engineers are requiring an engineers stamp on all concrete mix designs. I have been asked to stamp some existing mix designs from the local concrete supplier. Some have historical test results, others do not. My...
