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Re: I put in a dedicated ground...

Mike:
NEC 250.54 allows a "supplementary", "isolated" grounding electrode, *only* if the outlets have a normal green ground wire (or other "equipment grounding conductor" which can be a proper metallic conduit system) back to the house panelboard.

Lacking that, 250.50 requires all grounding electrodes to be bonded together.
"...the earth shall not be used as an effective ground-fault current path as specified in 250.4(A)(5) and 250.4(B)(4)."

The use of the word(s) "shall" and "shall not" in the National Electrical Code are legally binding and enforceable. There is zero-zero wiggle room or interpretation whims. Going crossway to the Shalls and Shall Nots takes on 100% culpability (tort, financial, civil, penal) for the designer, engineer, installer or even a neighbor advisor who knows a few things electrical, for any badness resulting thereof.

(I'm still trying to recoup from the voltage measurement posts below; excuse me if I appear flushed and out of sorts...)

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