Regional Fire HQ rang me back as requested.
The chemical test at the VIA duct was Hydrogen Cyanide not Hydrogen Sulphide as commander first thought when I spoke to him on the phone yesterday. But commanders Richard Twomey 21c wanted to qualify that correction with a couple of follow up points,
1. The tester which test the air, nick named “the explosive detector” showed predominately Hydrogen cyanide but it also included other chemicals.
2. The area is tested routinely as it is the location of the old tanks and is soaking is all sort of horrid stuff. The fish smell people smelt was most certainly not cyanide but one or more other chemicals and such smells “have being noted for decades”.
3. The Fire department did not call for back up and left soon after testing 2.5 million parts in a million the danger limit is 10 parts in a million. Your literally talking about source of cyanide in close proximity to the tester that is in minute quantities.
4. The testing was done on the old tank farm property not the pier.