If you have a look on the Work Safe Australia website they talk about the levels and prohibition of cancer causing carcinogens and what employers must do by law when handling these carcinogens or have workers in the vicinity of these carcinogens. There is a WHS Regulator that all complaints should be made to in regards to any unlawful behaviour regarding these carcinogens. In your state you will need to contact them, as they are the body that can take action.
First things first is you shold have approached your Ombudsman "Fair Work Australia" These guys are the first stop to resolving work place issues. How ever attempting to create a claim via these channels you your self would need to at least do some fair research into the Carcinogens, Your Contract details, and the companies policies versus the regulations around dangerous chemicals as stated by Fair Work Australia. Then the smart idea would be to find out if your work colleagues also have been working on this site/environment and if they can support your claims, then you have some 3rd party support on your side. Also collecting materials of said carcinogens and the log history of said site/environment including the Swims log and the break down of the work load carried out for that day/s with a consistent run of undeniable proof of dangers you may be exposed to. Making claims takes work, how ever it is easier if you already have the basics sorted as stated above. I'm no lawyer but I myself have used Fair Work and won cases, best one was an employer bribed me to cancel mediations pending a Fair Work beat down. He'd owed me money anyway but he asked me to "make it go away" in return for a triple payment. I'm no angel so I cancelled the mediation interview with Fair work, himself and I. And I got paid out very well. Pays to be able to lord over the very people that try to steal money from you. Pays in Spades