The issue around here was that second #6 was put under the acorn. It is listed for a single conductor only.
Simply put 2 acorns on the first ground rod and you are good to go.
250.62(F) is a powerful section that it seems like few people come to grips with. The handbook has a picture that clearly shows the ramifications of it.
To Electrode(s). A grounding electrode conductor shall be permitted to be run to any convenient grounding electode available in the grounding electrode system or to one or more grounding electrodes individually.
This allows both installations that George asks for, provided you use two connectors for the seperated GEC.
A little tip that this section allows is great for a large building. Say you have your switchgear near a building steel column. However your cold water is 500' across the warehouse which happens to be next to another building steel column. Simply bond your switch gear to the first column and bond the 2nd column to the cold water. Thus saving 500' of GEC.
One catch, engineers will often exceed NEC requirements and require seperate conductors. But, that is not required per the NEC.