I wire up a bath house at North Carolina Umstead State Park in 2004, I did not know anything about stray voltage. About a month after final inspection, I had to go back to troubleshoot a problem, people were getting shock when taking a shower, well I turn off all power to the building, I check voltage from grounded conductor had about 2.4 to 2.7v the same voltage at the shower head and concrete floor. Well I reported my results to my boss, he ask me to add a ground rod, that did not work, then he ask to make a ground ring with a ground rod at each corner of the bath house and add another ground rod to the rod at the service, well that did not work neither, he told me to leave it and that he would find more information on this, to this date I do not know what was done about it.