Came back today for another assault on this cap. This time I came with the hint but ... don't look for a power pole, it's not there.
Old Yeller ( my metal detector ) was with me again and this time she was VERY good to me. I only dug in one spot before I found the actual cap, about 3-4 inches underground. Dug, dug, dug and the cap was fully exposed. Poured some water on the cap a bit to clean it off and took a couple of pics.
NOTE : I have placed a small piece of flagging on the fence directly north of the cap and have left the cap exposed. It should be an easy find and to make it even easier I took 600 sample coordinates in order to come up with this average : N 50 58.675 W 114 08.282, 6-7 meters from the given coordinates, ymmv.