I see, from further research (see Utility's link below), that the well is from a gas storage reservoir, so that will be the source of the mercaptans, not naturally occurring H2S that I noted in my earlier comment. The reservoir stores methane which has already had the mercaptans odourant added to it, before the…

There appears to me to be something erroneous about this report. The smell the residents objecting to (mercaptans) is added (as the report notes) to give the natural gas, (methane) an odour, to aid in leak detection. It is added after the wellhead, ie not present in the leaking wellstream, so I’m mystified as to the…