Looks like the well pad that the plume is originating from is very old. Imagery going back to 1985 still shows it there with grass growing onto the pad even then. This is an old legacy well/battery that was built before anyone in the industry had even an ounce of care about it I imagine. On top of that the facility probably has fallen into disrepair for all we know.

Strange thing is I was just on a well pad that is shown in this image like a month ago. Weird to know that I was just sitting in a cloud of methane likely.