On the record
Your designation was assigned the first time you arrived, by your own device, from its own random number generator. The Survey was not involved and could not have been. There is no list of operators anywhere, because there is nowhere for a list to be kept.
What the file holds is what your instruments measured: how long the array was online, what the floor of each room was, how far above it any reading went, which way the instrument was pointed, and whatever you chose to write against it afterwards. It holds no location, no device identifier and nothing that could be used to work out who you are. The one piece of free text on the page — the name of a site — is something you typed for your own benefit, and it stays in this browser with everything else.
The Survey is aware that this is a poor way to run an archive. Records are lost when a phone is replaced, when browsing data is cleared, and when a browser decides on its own that a site it has not seen for months no longer needs its storage. All of that is true and none of it is going to be fixed, because the alternative is a database with your readings in it and that is a worse thing to be.
It is, however, an excellent way to run a privacy policy. Take the export if the file matters to you.